#include "frame-base.h"
#include "trad-frame.h"
#include "infcall.h"
+#include "floatformat.h"
static const struct objfile_data *mips_pdr_data;
-static void set_reg_offset (CORE_ADDR *saved_regs, int regnum, CORE_ADDR off);
static struct type *mips_register_type (struct gdbarch *gdbarch, int regnum);
-/* A useful bit in the CP0 status register (PS_REGNUM). */
+/* A useful bit in the CP0 status register (MIPS_PS_REGNUM). */
/* This bit is set if we are emulating 32-bit FPRs on a 64-bit chip. */
#define ST0_FR (1 << 26)
NULL
};
-struct frame_extra_info
-{
- mips_extra_func_info_t proc_desc;
- int num_args;
-};
-
/* Various MIPS ISA options (related to stack analysis) can be
overridden dynamically. Establish an enum/array for managing
them. */
const char **mips_processor_reg_names;
};
+static int
+n32n64_floatformat_always_valid (const struct floatformat *fmt,
+ const char *from)
+{
+ return 1;
+}
+
+/* FIXME: brobecker/2004-08-08: Long Double values are 128 bit long.
+ They are implemented as a pair of 64bit doubles where the high
+ part holds the result of the operation rounded to double, and
+ the low double holds the difference between the exact result and
+ the rounded result. So "high" + "low" contains the result with
+ added precision. Unfortunately, the floatformat structure used
+ by GDB is not powerful enough to describe this format. As a temporary
+ measure, we define a 128bit floatformat that only uses the high part.
+ We lose a bit of precision but that's probably the best we can do
+ for now with the current infrastructure. */
+
+static const struct floatformat floatformat_n32n64_long_double_big =
+{
+ floatformat_big, 128, 0, 1, 11, 1023, 2047, 12, 52,
+ floatformat_intbit_no,
+ "floatformat_ieee_double_big",
+ n32n64_floatformat_always_valid
+};
+
const struct mips_regnum *
mips_regnum (struct gdbarch *gdbarch)
{
return ((addr) & 1);
}
-static CORE_ADDR
-make_mips16_addr (CORE_ADDR addr)
-{
- return ((addr) | 1);
-}
-
static CORE_ADDR
unmake_mips16_addr (CORE_ADDR addr)
{
static LONGEST
read_signed_register (int regnum)
{
- void *buf = alloca (register_size (current_gdbarch, regnum));
- deprecated_read_register_gen (regnum, buf);
- return (extract_signed_integer
- (buf, register_size (current_gdbarch, regnum)));
+ LONGEST val;
+ regcache_cooked_read_signed (current_regcache, regnum, &val);
+ return val;
}
static LONGEST
static const char *mips_abi_regsize_string = size_auto;
-static unsigned int
+unsigned int
mips_abi_regsize (struct gdbarch *gdbarch)
{
if (mips_abi_regsize_string == size_auto)
/* Otherwise check the FR bit in the status register - it controls
the FP compatiblity mode. If it is clear we are in compatibility
mode. */
- if ((read_register (PS_REGNUM) & ST0_FR) == 0)
+ if ((read_register (MIPS_PS_REGNUM) & ST0_FR) == 0)
return 1;
#endif
#define VM_MIN_ADDRESS (CORE_ADDR)0x400000
-static mips_extra_func_info_t heuristic_proc_desc (CORE_ADDR, CORE_ADDR,
- struct frame_info *, int);
-
static CORE_ADDR heuristic_proc_start (CORE_ADDR);
static CORE_ADDR read_next_frame_reg (struct frame_info *, int);
static void reinit_frame_cache_sfunc (char *, int, struct cmd_list_element *);
-static mips_extra_func_info_t find_proc_desc (CORE_ADDR pc,
- struct frame_info *next_frame,
- int cur_frame);
-
-static CORE_ADDR after_prologue (CORE_ADDR pc,
- mips_extra_func_info_t proc_desc);
-
static struct type *mips_float_register_type (void);
static struct type *mips_double_register_type (void);
static unsigned int heuristic_fence_post = 0;
-#define PROC_LOW_ADDR(proc) ((proc)->pdr.adr) /* least address */
-#define PROC_HIGH_ADDR(proc) ((proc)->high_addr) /* upper address bound */
-#define PROC_FRAME_OFFSET(proc) ((proc)->pdr.frameoffset)
-#define PROC_FRAME_REG(proc) ((proc)->pdr.framereg)
-#define PROC_FRAME_ADJUST(proc) ((proc)->frame_adjust)
-#define PROC_REG_MASK(proc) ((proc)->pdr.regmask)
-#define PROC_FREG_MASK(proc) ((proc)->pdr.fregmask)
-#define PROC_REG_OFFSET(proc) ((proc)->pdr.regoffset)
-#define PROC_FREG_OFFSET(proc) ((proc)->pdr.fregoffset)
-#define PROC_PC_REG(proc) ((proc)->pdr.pcreg)
-/* FIXME drow/2002-06-10: If a pointer on the host is bigger than a long,
- this will corrupt pdr.iline. Fortunately we don't use it. */
-#define PROC_SYMBOL(proc) (*(struct symbol**)&(proc)->pdr.isym)
-#define _PROC_MAGIC_ 0x0F0F0F0F
-#define PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.isym == _PROC_MAGIC_)
-#define SET_PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.isym = _PROC_MAGIC_)
-
-struct linked_proc_info
-{
- struct mips_extra_func_info info;
- struct linked_proc_info *next;
-}
- *linked_proc_desc_table = NULL;
-
/* Number of bytes of storage in the actual machine representation for
register N. NOTE: This defines the pseudo register type so need to
rebuild the architecture vector. */
the ABI (with a few complications). */
if (regnum >= (NUM_REGS
+ mips_regnum (current_gdbarch)->fp_control_status)
- && regnum <= NUM_REGS + LAST_EMBED_REGNUM)
+ && regnum <= NUM_REGS + MIPS_LAST_EMBED_REGNUM)
/* The pseudo/cooked view of the embedded registers is always
32-bit. The raw view is handled below. */
return builtin_type_int32;
static CORE_ADDR
mips_read_sp (void)
{
- return read_signed_register (SP_REGNUM);
+ return read_signed_register (MIPS_SP_REGNUM);
}
/* Should the upper word of 64-bit addresses be zeroed? */
/* Tell if the program counter value in MEMADDR is in a MIPS16 function. */
-static int
-pc_is_mips16 (bfd_vma memaddr)
+int
+mips_pc_is_mips16 (CORE_ADDR memaddr)
{
struct minimal_symbol *sym;
return 0;
}
-/* MIPS believes that the PC has a sign extended value. Perhaphs the
+/* MIPS believes that the PC has a sign extended value. Perhaps the
all registers should be sign extended for simplicity? */
static CORE_ADDR
static struct frame_id
mips_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
- return frame_id_build (frame_unwind_register_signed (next_frame, NUM_REGS + SP_REGNUM),
+ return frame_id_build (frame_unwind_register_signed (next_frame, NUM_REGS + MIPS_SP_REGNUM),
frame_pc_unwind (next_frame));
}
write_register_pid (mips_regnum (current_gdbarch)->pc, pc, ptid);
}
-/* This returns the PC of the first inst after the prologue. If we can't
- find the prologue, then return 0. */
-
-static CORE_ADDR
-after_prologue (CORE_ADDR pc, mips_extra_func_info_t proc_desc)
-{
- struct symtab_and_line sal;
- CORE_ADDR func_addr, func_end;
-
- /* Pass cur_frame == 0 to find_proc_desc. We should not attempt
- to read the stack pointer from the current machine state, because
- the current machine state has nothing to do with the information
- we need from the proc_desc; and the process may or may not exist
- right now. */
- if (!proc_desc)
- proc_desc = find_proc_desc (pc, NULL, 0);
-
- if (proc_desc)
- {
- /* If function is frameless, then we need to do it the hard way. I
- strongly suspect that frameless always means prologueless... */
- if (PROC_FRAME_REG (proc_desc) == SP_REGNUM
- && PROC_FRAME_OFFSET (proc_desc) == 0)
- return 0;
- }
-
- if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end))
- return 0; /* Unknown */
-
- sal = find_pc_line (func_addr, 0);
-
- if (sal.end < func_end)
- return sal.end;
-
- /* The line after the prologue is after the end of the function. In this
- case, tell the caller to find the prologue the hard way. */
-
- return 0;
-}
-
-/* Decode a MIPS32 instruction that saves a register in the stack, and
- set the appropriate bit in the general register mask or float register mask
- to indicate which register is saved. This is a helper function
- for mips_find_saved_regs. */
-
-static void
-mips32_decode_reg_save (t_inst inst, unsigned long *gen_mask,
- unsigned long *float_mask)
-{
- int reg;
-
- if ((inst & 0xffe00000) == 0xafa00000 /* sw reg,n($sp) */
- || (inst & 0xffe00000) == 0xafc00000 /* sw reg,n($r30) */
- || (inst & 0xffe00000) == 0xffa00000) /* sd reg,n($sp) */
- {
- /* It might be possible to use the instruction to
- find the offset, rather than the code below which
- is based on things being in a certain order in the
- frame, but figuring out what the instruction's offset
- is relative to might be a little tricky. */
- reg = (inst & 0x001f0000) >> 16;
- *gen_mask |= (1 << reg);
- }
- else if ((inst & 0xffe00000) == 0xe7a00000 /* swc1 freg,n($sp) */
- || (inst & 0xffe00000) == 0xe7c00000 /* swc1 freg,n($r30) */
- || (inst & 0xffe00000) == 0xf7a00000) /* sdc1 freg,n($sp) */
-
- {
- reg = ((inst & 0x001f0000) >> 16);
- *float_mask |= (1 << reg);
- }
-}
-
-/* Decode a MIPS16 instruction that saves a register in the stack, and
- set the appropriate bit in the general register or float register mask
- to indicate which register is saved. This is a helper function
- for mips_find_saved_regs. */
-
-static void
-mips16_decode_reg_save (t_inst inst, unsigned long *gen_mask)
-{
- if ((inst & 0xf800) == 0xd000) /* sw reg,n($sp) */
- {
- int reg = mips16_to_32_reg[(inst & 0x700) >> 8];
- *gen_mask |= (1 << reg);
- }
- else if ((inst & 0xff00) == 0xf900) /* sd reg,n($sp) */
- {
- int reg = mips16_to_32_reg[(inst & 0xe0) >> 5];
- *gen_mask |= (1 << reg);
- }
- else if ((inst & 0xff00) == 0x6200 /* sw $ra,n($sp) */
- || (inst & 0xff00) == 0xfa00) /* sd $ra,n($sp) */
- *gen_mask |= (1 << RA_REGNUM);
-}
-
-
/* Fetch and return instruction from the specified location. If the PC
is odd, assume it's a MIPS16 instruction; otherwise MIPS32. */
-static t_inst
+static ULONGEST
mips_fetch_instruction (CORE_ADDR addr)
{
- char buf[MIPS_INSTLEN];
+ char buf[MIPS_INSN32_SIZE];
int instlen;
int status;
- if (pc_is_mips16 (addr))
+ if (mips_pc_is_mips16 (addr))
{
- instlen = MIPS16_INSTLEN;
+ instlen = MIPS_INSN16_SIZE;
addr = unmake_mips16_addr (addr);
}
else
- instlen = MIPS_INSTLEN;
- status = read_memory_nobpt (addr, buf, instlen);
- if (status)
- memory_error (status, addr);
- return extract_unsigned_integer (buf, instlen);
-}
-
-static ULONGEST
-mips16_fetch_instruction (CORE_ADDR addr)
-{
- char buf[MIPS_INSTLEN];
- int instlen;
- int status;
-
- instlen = MIPS16_INSTLEN;
- addr = unmake_mips16_addr (addr);
- status = read_memory_nobpt (addr, buf, instlen);
- if (status)
- memory_error (status, addr);
- return extract_unsigned_integer (buf, instlen);
-}
-
-static ULONGEST
-mips32_fetch_instruction (CORE_ADDR addr)
-{
- char buf[MIPS_INSTLEN];
- int instlen;
- int status;
- instlen = MIPS_INSTLEN;
- status = read_memory_nobpt (addr, buf, instlen);
+ instlen = MIPS_INSN32_SIZE;
+ status = deprecated_read_memory_nobpt (addr, buf, instlen);
if (status)
memory_error (status, addr);
return extract_unsigned_integer (buf, instlen);
}
-
/* These the fields of 32 bit mips instructions */
#define mips32_op(x) (x >> 26)
#define itype_op(x) (x >> 26)
#define rtype_shamt(x) ((x >> 6) & 0x1f)
#define rtype_funct(x) (x & 0x3f)
-static CORE_ADDR
-mips32_relative_offset (unsigned long inst)
+static LONGEST
+mips32_relative_offset (ULONGEST inst)
{
- long x;
- x = itype_immediate (inst);
- if (x & 0x8000) /* sign bit set */
- {
- x |= 0xffff0000; /* sign extension */
- }
- x = x << 2;
- return x;
+ return ((itype_immediate (inst) ^ 0x8000) - 0x8000) << 2;
}
/* Determine whate to set a single step breakpoint while considering
pc += 8;
break;
case 6: /* BLEZ, BLEZL */
- if (read_signed_register (itype_rs (inst) <= 0))
+ if (read_signed_register (itype_rs (inst)) <= 0)
pc += mips32_relative_offset (inst) + 4;
else
pc += 8;
case 7:
default:
greater_branch: /* BGTZ, BGTZL */
- if (read_signed_register (itype_rs (inst) > 0))
+ if (read_signed_register (itype_rs (inst)) > 0)
pc += mips32_relative_offset (inst) + 4;
else
pc += 8;
struct trad_frame_saved_reg *saved_regs;
};
+/* Set a register's saved stack address in temp_saved_regs. If an
+ address has already been set for this register, do nothing; this
+ way we will only recognize the first save of a given register in a
+ function prologue.
-static struct mips_frame_cache *
-mips_mdebug_frame_cache (struct frame_info *next_frame, void **this_cache)
-{
- mips_extra_func_info_t proc_desc;
- struct mips_frame_cache *cache;
- struct gdbarch *gdbarch = get_frame_arch (next_frame);
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- /* r0 bit means kernel trap */
- int kernel_trap;
- /* What registers have been saved? Bitmasks. */
- unsigned long gen_mask, float_mask;
-
- if ((*this_cache) != NULL)
- return (*this_cache);
- cache = FRAME_OBSTACK_ZALLOC (struct mips_frame_cache);
- (*this_cache) = cache;
- cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
-
- /* Get the mdebug proc descriptor. */
- proc_desc = find_proc_desc (frame_pc_unwind (next_frame), next_frame, 1);
- if (proc_desc == NULL)
- /* I'm not sure how/whether this can happen. Normally when we
- can't find a proc_desc, we "synthesize" one using
- heuristic_proc_desc and set the saved_regs right away. */
- return cache;
-
- /* Extract the frame's base. */
- cache->base = (frame_unwind_register_signed (next_frame, NUM_REGS + PROC_FRAME_REG (proc_desc))
- + PROC_FRAME_OFFSET (proc_desc) - PROC_FRAME_ADJUST (proc_desc));
-
- kernel_trap = PROC_REG_MASK (proc_desc) & 1;
- gen_mask = kernel_trap ? 0xFFFFFFFF : PROC_REG_MASK (proc_desc);
- float_mask = kernel_trap ? 0xFFFFFFFF : PROC_FREG_MASK (proc_desc);
-
- /* In any frame other than the innermost or a frame interrupted by a
- signal, we assume that all registers have been saved. This
- assumes that all register saves in a function happen before the
- first function call. */
- if (in_prologue (frame_pc_unwind (next_frame), PROC_LOW_ADDR (proc_desc))
- /* Not sure exactly what kernel_trap means, but if it means the
- kernel saves the registers without a prologue doing it, we
- better not examine the prologue to see whether registers
- have been saved yet. */
- && !kernel_trap)
- {
- /* We need to figure out whether the registers that the
- proc_desc claims are saved have been saved yet. */
-
- CORE_ADDR addr;
-
- /* Bitmasks; set if we have found a save for the register. */
- unsigned long gen_save_found = 0;
- unsigned long float_save_found = 0;
- int mips16;
-
- /* If the address is odd, assume this is MIPS16 code. */
- addr = PROC_LOW_ADDR (proc_desc);
- mips16 = pc_is_mips16 (addr);
-
- /* Scan through this function's instructions preceding the
- current PC, and look for those that save registers. */
- while (addr < frame_pc_unwind (next_frame))
- {
- if (mips16)
- {
- mips16_decode_reg_save (mips16_fetch_instruction (addr),
- &gen_save_found);
- addr += MIPS16_INSTLEN;
- }
- else
- {
- mips32_decode_reg_save (mips32_fetch_instruction (addr),
- &gen_save_found, &float_save_found);
- addr += MIPS_INSTLEN;
- }
- }
- gen_mask = gen_save_found;
- float_mask = float_save_found;
- }
-
- /* Fill in the offsets for the registers which gen_mask says were
- saved. */
- {
- CORE_ADDR reg_position = (cache->base
- + PROC_REG_OFFSET (proc_desc));
- int ireg;
- for (ireg = MIPS_NUMREGS - 1; gen_mask; --ireg, gen_mask <<= 1)
- if (gen_mask & 0x80000000)
- {
- cache->saved_regs[NUM_REGS + ireg].addr = reg_position;
- reg_position -= mips_abi_regsize (gdbarch);
- }
- }
-
- /* The MIPS16 entry instruction saves $s0 and $s1 in the reverse
- order of that normally used by gcc. Therefore, we have to fetch
- the first instruction of the function, and if it's an entry
- instruction that saves $s0 or $s1, correct their saved addresses. */
- if (pc_is_mips16 (PROC_LOW_ADDR (proc_desc)))
- {
- ULONGEST inst = mips16_fetch_instruction (PROC_LOW_ADDR (proc_desc));
- if ((inst & 0xf81f) == 0xe809 && (inst & 0x700) != 0x700)
- /* entry */
- {
- int reg;
- int sreg_count = (inst >> 6) & 3;
-
- /* Check if the ra register was pushed on the stack. */
- CORE_ADDR reg_position = (cache->base
- + PROC_REG_OFFSET (proc_desc));
- if (inst & 0x20)
- reg_position -= mips_abi_regsize (gdbarch);
-
- /* Check if the s0 and s1 registers were pushed on the
- stack. */
- /* NOTE: cagney/2004-02-08: Huh? This is doing no such
- check. */
- for (reg = 16; reg < sreg_count + 16; reg++)
- {
- cache->saved_regs[NUM_REGS + reg].addr = reg_position;
- reg_position -= mips_abi_regsize (gdbarch);
- }
- }
- }
-
- /* Fill in the offsets for the registers which float_mask says were
- saved. */
- {
- CORE_ADDR reg_position = (cache->base
- + PROC_FREG_OFFSET (proc_desc));
- int ireg;
- /* Fill in the offsets for the float registers which float_mask
- says were saved. */
- for (ireg = MIPS_NUMREGS - 1; float_mask; --ireg, float_mask <<= 1)
- if (float_mask & 0x80000000)
- {
- if (mips_abi_regsize (gdbarch) == 4
- && TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
- {
- /* On a big endian 32 bit ABI, floating point registers
- are paired to form doubles such that the most
- significant part is in $f[N+1] and the least
- significant in $f[N] vis: $f[N+1] ||| $f[N]. The
- registers are also spilled as a pair and stored as a
- double.
-
- When little-endian the least significant part is
- stored first leading to the memory order $f[N] and
- then $f[N+1].
-
- Unfortunately, when big-endian the most significant
- part of the double is stored first, and the least
- significant is stored second. This leads to the
- registers being ordered in memory as firt $f[N+1] and
- then $f[N].
-
- For the big-endian case make certain that the
- addresses point at the correct (swapped) locations
- $f[N] and $f[N+1] pair (keep in mind that
- reg_position is decremented each time through the
- loop). */
- if ((ireg & 1))
- cache->saved_regs[NUM_REGS + mips_regnum (current_gdbarch)->fp0 + ireg]
- .addr = reg_position - mips_abi_regsize (gdbarch);
- else
- cache->saved_regs[NUM_REGS + mips_regnum (current_gdbarch)->fp0 + ireg]
- .addr = reg_position + mips_abi_regsize (gdbarch);
- }
- else
- cache->saved_regs[NUM_REGS + mips_regnum (current_gdbarch)->fp0 + ireg]
- .addr = reg_position;
- reg_position -= mips_abi_regsize (gdbarch);
- }
-
- cache->saved_regs[NUM_REGS + mips_regnum (current_gdbarch)->pc]
- = cache->saved_regs[NUM_REGS + RA_REGNUM];
- }
-
- /* SP_REGNUM, contains the value and not the address. */
- trad_frame_set_value (cache->saved_regs, NUM_REGS + SP_REGNUM, cache->base);
-
- return (*this_cache);
-}
-
-static void
-mips_mdebug_frame_this_id (struct frame_info *next_frame, void **this_cache,
- struct frame_id *this_id)
-{
- struct mips_frame_cache *info = mips_mdebug_frame_cache (next_frame,
- this_cache);
- (*this_id) = frame_id_build (info->base, frame_func_unwind (next_frame));
-}
+ For simplicity, save the address in both [0 .. NUM_REGS) and
+ [NUM_REGS .. 2*NUM_REGS). Strictly speaking, only the second range
+ is used as it is only second range (the ABI instead of ISA
+ registers) that comes into play when finding saved registers in a
+ frame. */
static void
-mips_mdebug_frame_prev_register (struct frame_info *next_frame,
- void **this_cache,
- int regnum, int *optimizedp,
- enum lval_type *lvalp, CORE_ADDR *addrp,
- int *realnump, void *valuep)
-{
- struct mips_frame_cache *info = mips_mdebug_frame_cache (next_frame,
- this_cache);
- trad_frame_prev_register (next_frame, info->saved_regs, regnum,
- optimizedp, lvalp, addrp, realnump, valuep);
-}
-
-static const struct frame_unwind mips_mdebug_frame_unwind =
-{
- NORMAL_FRAME,
- mips_mdebug_frame_this_id,
- mips_mdebug_frame_prev_register
-};
-
-static const struct frame_unwind *
-mips_mdebug_frame_sniffer (struct frame_info *next_frame)
+set_reg_offset (struct mips_frame_cache *this_cache, int regnum,
+ CORE_ADDR offset)
{
- return &mips_mdebug_frame_unwind;
+ if (this_cache != NULL
+ && this_cache->saved_regs[regnum].addr == -1)
+ {
+ this_cache->saved_regs[regnum + 0 * NUM_REGS].addr = offset;
+ this_cache->saved_regs[regnum + 1 * NUM_REGS].addr = offset;
+ }
}
-static CORE_ADDR
-mips_mdebug_frame_base_address (struct frame_info *next_frame,
- void **this_cache)
-{
- struct mips_frame_cache *info = mips_mdebug_frame_cache (next_frame,
- this_cache);
- return info->base;
-}
-static const struct frame_base mips_mdebug_frame_base = {
- &mips_mdebug_frame_unwind,
- mips_mdebug_frame_base_address,
- mips_mdebug_frame_base_address,
- mips_mdebug_frame_base_address
-};
+/* Fetch the immediate value from a MIPS16 instruction.
+ If the previous instruction was an EXTEND, use it to extend
+ the upper bits of the immediate value. This is a helper function
+ for mips16_scan_prologue. */
-static const struct frame_base *
-mips_mdebug_frame_base_sniffer (struct frame_info *next_frame)
+static int
+mips16_get_imm (unsigned short prev_inst, /* previous instruction */
+ unsigned short inst, /* current instruction */
+ int nbits, /* number of bits in imm field */
+ int scale, /* scale factor to be applied to imm */
+ int is_signed) /* is the imm field signed? */
{
- return &mips_mdebug_frame_base;
-}
+ int offset;
-static CORE_ADDR
-read_next_frame_reg (struct frame_info *fi, int regno)
-{
- /* Always a pseudo. */
- gdb_assert (regno >= NUM_REGS);
- if (fi == NULL)
+ if ((prev_inst & 0xf800) == 0xf000) /* prev instruction was EXTEND? */
{
- LONGEST val;
- regcache_cooked_read_signed (current_regcache, regno, &val);
- return val;
+ offset = ((prev_inst & 0x1f) << 11) | (prev_inst & 0x7e0);
+ if (offset & 0x8000) /* check for negative extend */
+ offset = 0 - (0x10000 - (offset & 0xffff));
+ return offset | (inst & 0x1f);
}
- else if ((regno % NUM_REGS) == SP_REGNUM)
- /* The SP_REGNUM is special, its value is stored in saved_regs.
- In fact, it is so special that it can even only be fetched
- using a raw register number! Once this code as been converted
- to frame-unwind the problem goes away. */
- return frame_unwind_register_signed (fi, regno % NUM_REGS);
else
- return frame_unwind_register_signed (fi, regno);
+ {
+ int max_imm = 1 << nbits;
+ int mask = max_imm - 1;
+ int sign_bit = max_imm >> 1;
+ offset = inst & mask;
+ if (is_signed && (offset & sign_bit))
+ offset = 0 - (max_imm - offset);
+ return offset * scale;
+ }
}
-/* mips_addr_bits_remove - remove useless address bits */
+
+/* Analyze the function prologue from START_PC to LIMIT_PC. Builds
+ the associated FRAME_CACHE if not null.
+ Return the address of the first instruction past the prologue. */
static CORE_ADDR
-mips_addr_bits_remove (CORE_ADDR addr)
+mips16_scan_prologue (CORE_ADDR start_pc, CORE_ADDR limit_pc,
+ struct frame_info *next_frame,
+ struct mips_frame_cache *this_cache)
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
- if (mips_mask_address_p (tdep) && (((ULONGEST) addr) >> 32 == 0xffffffffUL))
- /* This hack is a work-around for existing boards using PMON, the
- simulator, and any other 64-bit targets that doesn't have true
- 64-bit addressing. On these targets, the upper 32 bits of
- addresses are ignored by the hardware. Thus, the PC or SP are
- likely to have been sign extended to all 1s by instruction
- sequences that load 32-bit addresses. For example, a typical
- piece of code that loads an address is this:
+ CORE_ADDR cur_pc;
+ CORE_ADDR frame_addr = 0; /* Value of $r17, used as frame pointer */
+ CORE_ADDR sp;
+ long frame_offset = 0; /* Size of stack frame. */
+ long frame_adjust = 0; /* Offset of FP from SP. */
+ int frame_reg = MIPS_SP_REGNUM;
+ unsigned short prev_inst = 0; /* saved copy of previous instruction */
+ unsigned inst = 0; /* current instruction */
+ unsigned entry_inst = 0; /* the entry instruction */
+ int reg, offset;
- lui $r2, <upper 16 bits>
- ori $r2, <lower 16 bits>
+ int extend_bytes = 0;
+ int prev_extend_bytes;
+ CORE_ADDR end_prologue_addr = 0;
- But the lui sign-extends the value such that the upper 32 bits
- may be all 1s. The workaround is simply to mask off these
- bits. In the future, gcc may be changed to support true 64-bit
- addressing, and this masking will have to be disabled. */
- return addr &= 0xffffffffUL;
+ /* Can be called when there's no process, and hence when there's no
+ NEXT_FRAME. */
+ if (next_frame != NULL)
+ sp = read_next_frame_reg (next_frame, NUM_REGS + MIPS_SP_REGNUM);
else
- return addr;
-}
+ sp = 0;
-/* mips_software_single_step() is called just before we want to resume
- the inferior, if we want to single-step it but there is no hardware
- or kernel single-step support (MIPS on GNU/Linux for example). We find
- the target of the coming instruction and breakpoint it.
+ if (limit_pc > start_pc + 200)
+ limit_pc = start_pc + 200;
- single_step is also called just after the inferior stops. If we had
- set up a simulated single-step, we undo our damage. */
+ for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += MIPS_INSN16_SIZE)
+ {
+ /* Save the previous instruction. If it's an EXTEND, we'll extract
+ the immediate offset extension from it in mips16_get_imm. */
+ prev_inst = inst;
-void
-mips_software_single_step (enum target_signal sig, int insert_breakpoints_p)
-{
- static CORE_ADDR next_pc;
- typedef char binsn_quantum[BREAKPOINT_MAX];
- static binsn_quantum break_mem;
- CORE_ADDR pc;
-
- if (insert_breakpoints_p)
- {
- pc = read_register (mips_regnum (current_gdbarch)->pc);
- next_pc = mips_next_pc (pc);
-
- target_insert_breakpoint (next_pc, break_mem);
- }
- else
- target_remove_breakpoint (next_pc, break_mem);
-}
-
-static struct mips_extra_func_info temp_proc_desc;
-
-/* This hack will go away once the get_prev_frame() code has been
- modified to set the frame's type first. That is BEFORE init extra
- frame info et.al. is called. This is because it will become
- possible to skip the init extra info call for sigtramp and dummy
- frames. */
-static CORE_ADDR *temp_saved_regs;
-
-/* Set a register's saved stack address in temp_saved_regs. If an
- address has already been set for this register, do nothing; this
- way we will only recognize the first save of a given register in a
- function prologue.
-
- For simplicity, save the address in both [0 .. NUM_REGS) and
- [NUM_REGS .. 2*NUM_REGS). Strictly speaking, only the second range
- is used as it is only second range (the ABI instead of ISA
- registers) that comes into play when finding saved registers in a
- frame. */
-
-static void
-set_reg_offset (CORE_ADDR *saved_regs, int regno, CORE_ADDR offset)
-{
- if (saved_regs[regno] == 0)
- {
- saved_regs[regno + 0 * NUM_REGS] = offset;
- saved_regs[regno + 1 * NUM_REGS] = offset;
- }
-}
-
-
-/* Test whether the PC points to the return instruction at the
- end of a function. */
-
-static int
-mips_about_to_return (CORE_ADDR pc)
-{
- if (pc_is_mips16 (pc))
- /* This mips16 case isn't necessarily reliable. Sometimes the compiler
- generates a "jr $ra"; other times it generates code to load
- the return address from the stack to an accessible register (such
- as $a3), then a "jr" using that register. This second case
- is almost impossible to distinguish from an indirect jump
- used for switch statements, so we don't even try. */
- return mips_fetch_instruction (pc) == 0xe820; /* jr $ra */
- else
- return mips_fetch_instruction (pc) == 0x3e00008; /* jr $ra */
-}
-
-
-/* This fencepost looks highly suspicious to me. Removing it also
- seems suspicious as it could affect remote debugging across serial
- lines. */
-
-static CORE_ADDR
-heuristic_proc_start (CORE_ADDR pc)
-{
- CORE_ADDR start_pc;
- CORE_ADDR fence;
- int instlen;
- int seen_adjsp = 0;
-
- pc = ADDR_BITS_REMOVE (pc);
- start_pc = pc;
- fence = start_pc - heuristic_fence_post;
- if (start_pc == 0)
- return 0;
-
- if (heuristic_fence_post == UINT_MAX || fence < VM_MIN_ADDRESS)
- fence = VM_MIN_ADDRESS;
-
- instlen = pc_is_mips16 (pc) ? MIPS16_INSTLEN : MIPS_INSTLEN;
-
- /* search back for previous return */
- for (start_pc -= instlen;; start_pc -= instlen)
- if (start_pc < fence)
- {
- /* It's not clear to me why we reach this point when
- stop_soon, but with this test, at least we
- don't print out warnings for every child forked (eg, on
- decstation). 22apr93 rich@cygnus.com. */
- if (stop_soon == NO_STOP_QUIETLY)
- {
- static int blurb_printed = 0;
-
- warning ("GDB can't find the start of the function at 0x%s.",
- paddr_nz (pc));
-
- if (!blurb_printed)
- {
- /* This actually happens frequently in embedded
- development, when you first connect to a board
- and your stack pointer and pc are nowhere in
- particular. This message needs to give people
- in that situation enough information to
- determine that it's no big deal. */
- printf_filtered ("\n\
- GDB is unable to find the start of the function at 0x%s\n\
-and thus can't determine the size of that function's stack frame.\n\
-This means that GDB may be unable to access that stack frame, or\n\
-the frames below it.\n\
- This problem is most likely caused by an invalid program counter or\n\
-stack pointer.\n\
- However, if you think GDB should simply search farther back\n\
-from 0x%s for code which looks like the beginning of a\n\
-function, you can increase the range of the search using the `set\n\
-heuristic-fence-post' command.\n", paddr_nz (pc), paddr_nz (pc));
- blurb_printed = 1;
- }
- }
-
- return 0;
- }
- else if (pc_is_mips16 (start_pc))
- {
- unsigned short inst;
-
- /* On MIPS16, any one of the following is likely to be the
- start of a function:
- entry
- addiu sp,-n
- daddiu sp,-n
- extend -n followed by 'addiu sp,+n' or 'daddiu sp,+n' */
- inst = mips_fetch_instruction (start_pc);
- if (((inst & 0xf81f) == 0xe809 && (inst & 0x700) != 0x700) /* entry */
- || (inst & 0xff80) == 0x6380 /* addiu sp,-n */
- || (inst & 0xff80) == 0xfb80 /* daddiu sp,-n */
- || ((inst & 0xf810) == 0xf010 && seen_adjsp)) /* extend -n */
- break;
- else if ((inst & 0xff00) == 0x6300 /* addiu sp */
- || (inst & 0xff00) == 0xfb00) /* daddiu sp */
- seen_adjsp = 1;
- else
- seen_adjsp = 0;
- }
- else if (mips_about_to_return (start_pc))
- {
- start_pc += 2 * MIPS_INSTLEN; /* skip return, and its delay slot */
- break;
- }
-
- return start_pc;
-}
-
-/* Fetch the immediate value from a MIPS16 instruction.
- If the previous instruction was an EXTEND, use it to extend
- the upper bits of the immediate value. This is a helper function
- for mips16_heuristic_proc_desc. */
-
-static int
-mips16_get_imm (unsigned short prev_inst, /* previous instruction */
- unsigned short inst, /* current instruction */
- int nbits, /* number of bits in imm field */
- int scale, /* scale factor to be applied to imm */
- int is_signed) /* is the imm field signed? */
-{
- int offset;
-
- if ((prev_inst & 0xf800) == 0xf000) /* prev instruction was EXTEND? */
- {
- offset = ((prev_inst & 0x1f) << 11) | (prev_inst & 0x7e0);
- if (offset & 0x8000) /* check for negative extend */
- offset = 0 - (0x10000 - (offset & 0xffff));
- return offset | (inst & 0x1f);
- }
- else
- {
- int max_imm = 1 << nbits;
- int mask = max_imm - 1;
- int sign_bit = max_imm >> 1;
-
- offset = inst & mask;
- if (is_signed && (offset & sign_bit))
- offset = 0 - (max_imm - offset);
- return offset * scale;
- }
-}
-
-
-/* Fill in values in temp_proc_desc based on the MIPS16 instruction
- stream from start_pc to limit_pc. */
-
-static void
-mips16_heuristic_proc_desc (CORE_ADDR start_pc, CORE_ADDR limit_pc,
- struct frame_info *next_frame, CORE_ADDR sp)
-{
- CORE_ADDR cur_pc;
- CORE_ADDR frame_addr = 0; /* Value of $r17, used as frame pointer */
- unsigned short prev_inst = 0; /* saved copy of previous instruction */
- unsigned inst = 0; /* current instruction */
- unsigned entry_inst = 0; /* the entry instruction */
- int reg, offset;
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ /* Fetch and decode the instruction. */
+ inst = (unsigned short) mips_fetch_instruction (cur_pc);
- PROC_FRAME_OFFSET (&temp_proc_desc) = 0; /* size of stack frame */
- PROC_FRAME_ADJUST (&temp_proc_desc) = 0; /* offset of FP from SP */
+ /* Normally we ignore extend instructions. However, if it is
+ not followed by a valid prologue instruction, then this
+ instruction is not part of the prologue either. We must
+ remember in this case to adjust the end_prologue_addr back
+ over the extend. */
+ if ((inst & 0xf800) == 0xf000) /* extend */
+ {
+ extend_bytes = MIPS_INSN16_SIZE;
+ continue;
+ }
- for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += MIPS16_INSTLEN)
- {
- /* Save the previous instruction. If it's an EXTEND, we'll extract
- the immediate offset extension from it in mips16_get_imm. */
- prev_inst = inst;
+ prev_extend_bytes = extend_bytes;
+ extend_bytes = 0;
- /* Fetch and decode the instruction. */
- inst = (unsigned short) mips_fetch_instruction (cur_pc);
if ((inst & 0xff00) == 0x6300 /* addiu sp */
|| (inst & 0xff00) == 0xfb00) /* daddiu sp */
{
offset = mips16_get_imm (prev_inst, inst, 8, 8, 1);
if (offset < 0) /* negative stack adjustment? */
- PROC_FRAME_OFFSET (&temp_proc_desc) -= offset;
+ frame_offset -= offset;
else
/* Exit loop if a positive stack adjustment is found, which
usually means that the stack cleanup code in the function
{
offset = mips16_get_imm (prev_inst, inst, 8, 4, 0);
reg = mips16_to_32_reg[(inst & 0x700) >> 8];
- PROC_REG_MASK (&temp_proc_desc) |= (1 << reg);
- set_reg_offset (temp_saved_regs, reg, sp + offset);
+ set_reg_offset (this_cache, reg, sp + offset);
}
else if ((inst & 0xff00) == 0xf900) /* sd reg,n($sp) */
{
offset = mips16_get_imm (prev_inst, inst, 5, 8, 0);
reg = mips16_to_32_reg[(inst & 0xe0) >> 5];
- PROC_REG_MASK (&temp_proc_desc) |= (1 << reg);
- set_reg_offset (temp_saved_regs, reg, sp + offset);
+ set_reg_offset (this_cache, reg, sp + offset);
}
else if ((inst & 0xff00) == 0x6200) /* sw $ra,n($sp) */
{
offset = mips16_get_imm (prev_inst, inst, 8, 4, 0);
- PROC_REG_MASK (&temp_proc_desc) |= (1 << RA_REGNUM);
- set_reg_offset (temp_saved_regs, RA_REGNUM, sp + offset);
+ set_reg_offset (this_cache, MIPS_RA_REGNUM, sp + offset);
}
else if ((inst & 0xff00) == 0xfa00) /* sd $ra,n($sp) */
{
offset = mips16_get_imm (prev_inst, inst, 8, 8, 0);
- PROC_REG_MASK (&temp_proc_desc) |= (1 << RA_REGNUM);
- set_reg_offset (temp_saved_regs, RA_REGNUM, sp + offset);
+ set_reg_offset (this_cache, MIPS_RA_REGNUM, sp + offset);
}
else if (inst == 0x673d) /* move $s1, $sp */
{
frame_addr = sp;
- PROC_FRAME_REG (&temp_proc_desc) = 17;
+ frame_reg = 17;
}
else if ((inst & 0xff00) == 0x0100) /* addiu $s1,sp,n */
{
offset = mips16_get_imm (prev_inst, inst, 8, 4, 0);
frame_addr = sp + offset;
- PROC_FRAME_REG (&temp_proc_desc) = 17;
- PROC_FRAME_ADJUST (&temp_proc_desc) = offset;
+ frame_reg = 17;
+ frame_adjust = offset;
}
else if ((inst & 0xFF00) == 0xd900) /* sw reg,offset($s1) */
{
offset = mips16_get_imm (prev_inst, inst, 5, 4, 0);
reg = mips16_to_32_reg[(inst & 0xe0) >> 5];
- PROC_REG_MASK (&temp_proc_desc) |= 1 << reg;
- set_reg_offset (temp_saved_regs, reg, frame_addr + offset);
+ set_reg_offset (this_cache, reg, frame_addr + offset);
}
else if ((inst & 0xFF00) == 0x7900) /* sd reg,offset($s1) */
{
offset = mips16_get_imm (prev_inst, inst, 5, 8, 0);
reg = mips16_to_32_reg[(inst & 0xe0) >> 5];
- PROC_REG_MASK (&temp_proc_desc) |= 1 << reg;
- set_reg_offset (temp_saved_regs, reg, frame_addr + offset);
+ set_reg_offset (this_cache, reg, frame_addr + offset);
}
- else if ((inst & 0xf81f) == 0xe809 && (inst & 0x700) != 0x700) /* entry */
+ else if ((inst & 0xf81f) == 0xe809
+ && (inst & 0x700) != 0x700) /* entry */
entry_inst = inst; /* save for later processing */
else if ((inst & 0xf800) == 0x1800) /* jal(x) */
- cur_pc += MIPS16_INSTLEN; /* 32-bit instruction */
+ cur_pc += MIPS_INSN16_SIZE; /* 32-bit instruction */
+ else if ((inst & 0xff1c) == 0x6704) /* move reg,$a0-$a3 */
+ {
+ /* This instruction is part of the prologue, but we don't
+ need to do anything special to handle it. */
+ }
+ else
+ {
+ /* This instruction is not an instruction typically found
+ in a prologue, so we must have reached the end of the
+ prologue. */
+ if (end_prologue_addr == 0)
+ end_prologue_addr = cur_pc - prev_extend_bytes;
+ }
}
/* The entry instruction is typically the first instruction in a function,
int sreg_count = (entry_inst >> 6) & 3;
/* The entry instruction always subtracts 32 from the SP. */
- PROC_FRAME_OFFSET (&temp_proc_desc) += 32;
+ frame_offset += 32;
/* Now we can calculate what the SP must have been at the
start of the function prologue. */
- sp += PROC_FRAME_OFFSET (&temp_proc_desc);
+ sp += frame_offset;
/* Check if a0-a3 were saved in the caller's argument save area. */
for (reg = 4, offset = 0; reg < areg_count + 4; reg++)
{
- PROC_REG_MASK (&temp_proc_desc) |= 1 << reg;
- set_reg_offset (temp_saved_regs, reg, sp + offset);
+ set_reg_offset (this_cache, reg, sp + offset);
offset += mips_abi_regsize (current_gdbarch);
}
offset = -4;
if (entry_inst & 0x20)
{
- PROC_REG_MASK (&temp_proc_desc) |= 1 << RA_REGNUM;
- set_reg_offset (temp_saved_regs, RA_REGNUM, sp + offset);
+ set_reg_offset (this_cache, MIPS_RA_REGNUM, sp + offset);
offset -= mips_abi_regsize (current_gdbarch);
}
/* Check if the s0 and s1 registers were pushed on the stack. */
for (reg = 16; reg < sreg_count + 16; reg++)
{
- PROC_REG_MASK (&temp_proc_desc) |= 1 << reg;
- set_reg_offset (temp_saved_regs, reg, sp + offset);
+ set_reg_offset (this_cache, reg, sp + offset);
offset -= mips_abi_regsize (current_gdbarch);
}
}
+
+ if (this_cache != NULL)
+ {
+ this_cache->base =
+ (frame_unwind_register_signed (next_frame, NUM_REGS + frame_reg)
+ + frame_offset - frame_adjust);
+ /* FIXME: brobecker/2004-10-10: Just as in the mips32 case, we should
+ be able to get rid of the assignment below, evetually. But it's
+ still needed for now. */
+ this_cache->saved_regs[NUM_REGS + mips_regnum (current_gdbarch)->pc]
+ = this_cache->saved_regs[NUM_REGS + MIPS_RA_REGNUM];
+ }
+
+ /* If we didn't reach the end of the prologue when scanning the function
+ instructions, then set end_prologue_addr to the address of the
+ instruction immediately after the last one we scanned. */
+ if (end_prologue_addr == 0)
+ end_prologue_addr = cur_pc;
+
+ return end_prologue_addr;
+}
+
+/* Heuristic unwinder for 16-bit MIPS instruction set (aka MIPS16).
+ Procedures that use the 32-bit instruction set are handled by the
+ mips_insn32 unwinder. */
+
+static struct mips_frame_cache *
+mips_insn16_frame_cache (struct frame_info *next_frame, void **this_cache)
+{
+ struct mips_frame_cache *cache;
+
+ if ((*this_cache) != NULL)
+ return (*this_cache);
+ cache = FRAME_OBSTACK_ZALLOC (struct mips_frame_cache);
+ (*this_cache) = cache;
+ cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+
+ /* Analyze the function prologue. */
+ {
+ const CORE_ADDR pc = frame_pc_unwind (next_frame);
+ CORE_ADDR start_addr;
+
+ find_pc_partial_function (pc, NULL, &start_addr, NULL);
+ if (start_addr == 0)
+ start_addr = heuristic_proc_start (pc);
+ /* We can't analyze the prologue if we couldn't find the begining
+ of the function. */
+ if (start_addr == 0)
+ return cache;
+
+ mips16_scan_prologue (start_addr, pc, next_frame, *this_cache);
+ }
+
+ /* SP_REGNUM, contains the value and not the address. */
+ trad_frame_set_value (cache->saved_regs, NUM_REGS + MIPS_SP_REGNUM, cache->base);
+
+ return (*this_cache);
}
static void
-mips32_heuristic_proc_desc (CORE_ADDR start_pc, CORE_ADDR limit_pc,
- struct frame_info *next_frame, CORE_ADDR sp)
+mips_insn16_frame_this_id (struct frame_info *next_frame, void **this_cache,
+ struct frame_id *this_id)
{
- CORE_ADDR cur_pc;
- CORE_ADDR frame_addr = 0; /* Value of $r30. Used by gcc for frame-pointer */
-restart:
- temp_saved_regs = xrealloc (temp_saved_regs, SIZEOF_FRAME_SAVED_REGS);
- memset (temp_saved_regs, '\0', SIZEOF_FRAME_SAVED_REGS);
- PROC_FRAME_OFFSET (&temp_proc_desc) = 0;
- PROC_FRAME_ADJUST (&temp_proc_desc) = 0; /* offset of FP from SP */
- for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += MIPS_INSTLEN)
- {
- unsigned long inst, high_word, low_word;
- int reg;
+ struct mips_frame_cache *info = mips_insn16_frame_cache (next_frame,
+ this_cache);
+ (*this_id) = frame_id_build (info->base, frame_func_unwind (next_frame));
+}
- /* Fetch the instruction. */
- inst = (unsigned long) mips_fetch_instruction (cur_pc);
+static void
+mips_insn16_frame_prev_register (struct frame_info *next_frame,
+ void **this_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, void *valuep)
+{
+ struct mips_frame_cache *info = mips_insn16_frame_cache (next_frame,
+ this_cache);
+ trad_frame_get_prev_register (next_frame, info->saved_regs, regnum,
+ optimizedp, lvalp, addrp, realnump, valuep);
+}
- /* Save some code by pre-extracting some useful fields. */
- high_word = (inst >> 16) & 0xffff;
- low_word = inst & 0xffff;
- reg = high_word & 0x1f;
+static const struct frame_unwind mips_insn16_frame_unwind =
+{
+ NORMAL_FRAME,
+ mips_insn16_frame_this_id,
+ mips_insn16_frame_prev_register
+};
- if (high_word == 0x27bd /* addiu $sp,$sp,-i */
- || high_word == 0x23bd /* addi $sp,$sp,-i */
- || high_word == 0x67bd) /* daddiu $sp,$sp,-i */
- {
- if (low_word & 0x8000) /* negative stack adjustment? */
- PROC_FRAME_OFFSET (&temp_proc_desc) += 0x10000 - low_word;
- else
- /* Exit loop if a positive stack adjustment is found, which
- usually means that the stack cleanup code in the function
+static const struct frame_unwind *
+mips_insn16_frame_sniffer (struct frame_info *next_frame)
+{
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
+ if (mips_pc_is_mips16 (pc))
+ return &mips_insn16_frame_unwind;
+ return NULL;
+}
+
+static CORE_ADDR
+mips_insn16_frame_base_address (struct frame_info *next_frame,
+ void **this_cache)
+{
+ struct mips_frame_cache *info = mips_insn16_frame_cache (next_frame,
+ this_cache);
+ return info->base;
+}
+
+static const struct frame_base mips_insn16_frame_base =
+{
+ &mips_insn16_frame_unwind,
+ mips_insn16_frame_base_address,
+ mips_insn16_frame_base_address,
+ mips_insn16_frame_base_address
+};
+
+static const struct frame_base *
+mips_insn16_frame_base_sniffer (struct frame_info *next_frame)
+{
+ if (mips_insn16_frame_sniffer (next_frame) != NULL)
+ return &mips_insn16_frame_base;
+ else
+ return NULL;
+}
+
+/* Mark all the registers as unset in the saved_regs array
+ of THIS_CACHE. Do nothing if THIS_CACHE is null. */
+
+void
+reset_saved_regs (struct mips_frame_cache *this_cache)
+{
+ if (this_cache == NULL || this_cache->saved_regs == NULL)
+ return;
+
+ {
+ const int num_regs = NUM_REGS;
+ int i;
+
+ for (i = 0; i < num_regs; i++)
+ {
+ this_cache->saved_regs[i].addr = -1;
+ }
+ }
+}
+
+/* Analyze the function prologue from START_PC to LIMIT_PC. Builds
+ the associated FRAME_CACHE if not null.
+ Return the address of the first instruction past the prologue. */
+
+static CORE_ADDR
+mips32_scan_prologue (CORE_ADDR start_pc, CORE_ADDR limit_pc,
+ struct frame_info *next_frame,
+ struct mips_frame_cache *this_cache)
+{
+ CORE_ADDR cur_pc;
+ CORE_ADDR frame_addr = 0; /* Value of $r30. Used by gcc for frame-pointer */
+ CORE_ADDR sp;
+ long frame_offset;
+ int frame_reg = MIPS_SP_REGNUM;
+
+ CORE_ADDR end_prologue_addr = 0;
+ int seen_sp_adjust = 0;
+ int load_immediate_bytes = 0;
+
+ /* Can be called when there's no process, and hence when there's no
+ NEXT_FRAME. */
+ if (next_frame != NULL)
+ sp = read_next_frame_reg (next_frame, NUM_REGS + MIPS_SP_REGNUM);
+ else
+ sp = 0;
+
+ if (limit_pc > start_pc + 200)
+ limit_pc = start_pc + 200;
+
+restart:
+
+ frame_offset = 0;
+ for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += MIPS_INSN32_SIZE)
+ {
+ unsigned long inst, high_word, low_word;
+ int reg;
+
+ /* Fetch the instruction. */
+ inst = (unsigned long) mips_fetch_instruction (cur_pc);
+
+ /* Save some code by pre-extracting some useful fields. */
+ high_word = (inst >> 16) & 0xffff;
+ low_word = inst & 0xffff;
+ reg = high_word & 0x1f;
+
+ if (high_word == 0x27bd /* addiu $sp,$sp,-i */
+ || high_word == 0x23bd /* addi $sp,$sp,-i */
+ || high_word == 0x67bd) /* daddiu $sp,$sp,-i */
+ {
+ if (low_word & 0x8000) /* negative stack adjustment? */
+ frame_offset += 0x10000 - low_word;
+ else
+ /* Exit loop if a positive stack adjustment is found, which
+ usually means that the stack cleanup code in the function
epilogue is reached. */
break;
+ seen_sp_adjust = 1;
}
else if ((high_word & 0xFFE0) == 0xafa0) /* sw reg,offset($sp) */
{
- PROC_REG_MASK (&temp_proc_desc) |= 1 << reg;
- set_reg_offset (temp_saved_regs, reg, sp + low_word);
+ set_reg_offset (this_cache, reg, sp + low_word);
}
else if ((high_word & 0xFFE0) == 0xffa0) /* sd reg,offset($sp) */
{
- /* Irix 6.2 N32 ABI uses sd instructions for saving $gp and
- $ra. */
- PROC_REG_MASK (&temp_proc_desc) |= 1 << reg;
- set_reg_offset (temp_saved_regs, reg, sp + low_word);
+ /* Irix 6.2 N32 ABI uses sd instructions for saving $gp and $ra. */
+ set_reg_offset (this_cache, reg, sp + low_word);
}
else if (high_word == 0x27be) /* addiu $30,$sp,size */
{
/* Old gcc frame, r30 is virtual frame pointer. */
- if ((long) low_word != PROC_FRAME_OFFSET (&temp_proc_desc))
+ if ((long) low_word != frame_offset)
frame_addr = sp + low_word;
- else if (PROC_FRAME_REG (&temp_proc_desc) == SP_REGNUM)
+ else if (frame_reg == MIPS_SP_REGNUM)
{
unsigned alloca_adjust;
- PROC_FRAME_REG (&temp_proc_desc) = 30;
+
+ frame_reg = 30;
frame_addr = read_next_frame_reg (next_frame, NUM_REGS + 30);
alloca_adjust = (unsigned) (frame_addr - (sp + low_word));
if (alloca_adjust > 0)
{
- /* FP > SP + frame_size. This may be because
- * of an alloca or somethings similar.
- * Fix sp to "pre-alloca" value, and try again.
- */
+ /* FP > SP + frame_size. This may be because of
+ an alloca or somethings similar. Fix sp to
+ "pre-alloca" value, and try again. */
sp += alloca_adjust;
+ /* Need to reset the status of all registers. Otherwise,
+ we will hit a guard that prevents the new address
+ for each register to be recomputed during the second
+ pass. */
+ reset_saved_regs (this_cache);
goto restart;
}
}
else if (inst == 0x03A0F021 || inst == 0x03a0f025 || inst == 0x03a0f02d)
{
/* New gcc frame, virtual frame pointer is at r30 + frame_size. */
- if (PROC_FRAME_REG (&temp_proc_desc) == SP_REGNUM)
+ if (frame_reg == MIPS_SP_REGNUM)
{
unsigned alloca_adjust;
- PROC_FRAME_REG (&temp_proc_desc) = 30;
+
+ frame_reg = 30;
frame_addr = read_next_frame_reg (next_frame, NUM_REGS + 30);
alloca_adjust = (unsigned) (frame_addr - sp);
if (alloca_adjust > 0)
- {
- /* FP > SP + frame_size. This may be because
- * of an alloca or somethings similar.
- * Fix sp to "pre-alloca" value, and try again.
- */
- sp += alloca_adjust;
- goto restart;
- }
+ {
+ /* FP > SP + frame_size. This may be because of
+ an alloca or somethings similar. Fix sp to
+ "pre-alloca" value, and try again. */
+ sp = frame_addr;
+ /* Need to reset the status of all registers. Otherwise,
+ we will hit a guard that prevents the new address
+ for each register to be recomputed during the second
+ pass. */
+ reset_saved_regs (this_cache);
+ goto restart;
+ }
}
}
else if ((high_word & 0xFFE0) == 0xafc0) /* sw reg,offset($30) */
{
- PROC_REG_MASK (&temp_proc_desc) |= 1 << reg;
- set_reg_offset (temp_saved_regs, reg, frame_addr + low_word);
+ set_reg_offset (this_cache, reg, frame_addr + low_word);
}
+ else if ((high_word & 0xFFE0) == 0xE7A0 /* swc1 freg,n($sp) */
+ || (high_word & 0xF3E0) == 0xA3C0 /* sx reg,n($s8) */
+ || (inst & 0xFF9F07FF) == 0x00800021 /* move reg,$a0-$a3 */
+ || high_word == 0x3c1c /* lui $gp,n */
+ || high_word == 0x279c /* addiu $gp,$gp,n */
+ || inst == 0x0399e021 /* addu $gp,$gp,$t9 */
+ || inst == 0x033ce021 /* addu $gp,$t9,$gp */
+ )
+ {
+ /* These instructions are part of the prologue, but we don't
+ need to do anything special to handle them. */
+ }
+ /* The instructions below load $at or $t0 with an immediate
+ value in preparation for a stack adjustment via
+ subu $sp,$sp,[$at,$t0]. These instructions could also
+ initialize a local variable, so we accept them only before
+ a stack adjustment instruction was seen. */
+ else if (!seen_sp_adjust
+ && (high_word == 0x3c01 /* lui $at,n */
+ || high_word == 0x3c08 /* lui $t0,n */
+ || high_word == 0x3421 /* ori $at,$at,n */
+ || high_word == 0x3508 /* ori $t0,$t0,n */
+ || high_word == 0x3401 /* ori $at,$zero,n */
+ || high_word == 0x3408 /* ori $t0,$zero,n */
+ ))
+ {
+ load_immediate_bytes += MIPS_INSN32_SIZE; /* FIXME! */
+ }
+ else
+ {
+ /* This instruction is not an instruction typically found
+ in a prologue, so we must have reached the end of the
+ prologue. */
+ /* FIXME: brobecker/2004-10-10: Can't we just break out of this
+ loop now? Why would we need to continue scanning the function
+ instructions? */
+ if (end_prologue_addr == 0)
+ end_prologue_addr = cur_pc;
+ }
+ }
+
+ if (this_cache != NULL)
+ {
+ this_cache->base =
+ (frame_unwind_register_signed (next_frame, NUM_REGS + frame_reg)
+ + frame_offset);
+ /* FIXME: brobecker/2004-09-15: We should be able to get rid of
+ this assignment below, eventually. But it's still needed
+ for now. */
+ this_cache->saved_regs[NUM_REGS + mips_regnum (current_gdbarch)->pc]
+ = this_cache->saved_regs[NUM_REGS + MIPS_RA_REGNUM];
}
+
+ /* If we didn't reach the end of the prologue when scanning the function
+ instructions, then set end_prologue_addr to the address of the
+ instruction immediately after the last one we scanned. */
+ /* brobecker/2004-10-10: I don't think this would ever happen, but
+ we may as well be careful and do our best if we have a null
+ end_prologue_addr. */
+ if (end_prologue_addr == 0)
+ end_prologue_addr = cur_pc;
+
+ /* In a frameless function, we might have incorrectly
+ skipped some load immediate instructions. Undo the skipping
+ if the load immediate was not followed by a stack adjustment. */
+ if (load_immediate_bytes && !seen_sp_adjust)
+ end_prologue_addr -= load_immediate_bytes;
+
+ return end_prologue_addr;
}
-static mips_extra_func_info_t
-heuristic_proc_desc (CORE_ADDR start_pc, CORE_ADDR limit_pc,
- struct frame_info *next_frame, int cur_frame)
+/* Heuristic unwinder for procedures using 32-bit instructions (covers
+ both 32-bit and 64-bit MIPS ISAs). Procedures using 16-bit
+ instructions (a.k.a. MIPS16) are handled by the mips_insn16
+ unwinder. */
+
+static struct mips_frame_cache *
+mips_insn32_frame_cache (struct frame_info *next_frame, void **this_cache)
{
- CORE_ADDR sp;
+ struct mips_frame_cache *cache;
- if (cur_frame)
- sp = read_next_frame_reg (next_frame, NUM_REGS + SP_REGNUM);
- else
- sp = 0;
+ if ((*this_cache) != NULL)
+ return (*this_cache);
- if (start_pc == 0)
- return NULL;
- memset (&temp_proc_desc, '\0', sizeof (temp_proc_desc));
- temp_saved_regs = xrealloc (temp_saved_regs, SIZEOF_FRAME_SAVED_REGS);
- memset (temp_saved_regs, '\0', SIZEOF_FRAME_SAVED_REGS);
- PROC_LOW_ADDR (&temp_proc_desc) = start_pc;
- PROC_FRAME_REG (&temp_proc_desc) = SP_REGNUM;
- PROC_PC_REG (&temp_proc_desc) = RA_REGNUM;
-
- if (start_pc + 200 < limit_pc)
- limit_pc = start_pc + 200;
- if (pc_is_mips16 (start_pc))
- mips16_heuristic_proc_desc (start_pc, limit_pc, next_frame, sp);
- else
- mips32_heuristic_proc_desc (start_pc, limit_pc, next_frame, sp);
- return &temp_proc_desc;
+ cache = FRAME_OBSTACK_ZALLOC (struct mips_frame_cache);
+ (*this_cache) = cache;
+ cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+
+ /* Analyze the function prologue. */
+ {
+ const CORE_ADDR pc = frame_pc_unwind (next_frame);
+ CORE_ADDR start_addr;
+
+ find_pc_partial_function (pc, NULL, &start_addr, NULL);
+ if (start_addr == 0)
+ start_addr = heuristic_proc_start (pc);
+ /* We can't analyze the prologue if we couldn't find the begining
+ of the function. */
+ if (start_addr == 0)
+ return cache;
+
+ mips32_scan_prologue (start_addr, pc, next_frame, *this_cache);
+ }
+
+ /* SP_REGNUM, contains the value and not the address. */
+ trad_frame_set_value (cache->saved_regs, NUM_REGS + MIPS_SP_REGNUM, cache->base);
+
+ return (*this_cache);
}
-struct mips_objfile_private
+static void
+mips_insn32_frame_this_id (struct frame_info *next_frame, void **this_cache,
+ struct frame_id *this_id)
{
- bfd_size_type size;
- char *contents;
-};
+ struct mips_frame_cache *info = mips_insn32_frame_cache (next_frame,
+ this_cache);
+ (*this_id) = frame_id_build (info->base, frame_func_unwind (next_frame));
+}
-/* Global used to communicate between non_heuristic_proc_desc and
- compare_pdr_entries within qsort (). */
-static bfd *the_bfd;
+static void
+mips_insn32_frame_prev_register (struct frame_info *next_frame,
+ void **this_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, void *valuep)
+{
+ struct mips_frame_cache *info = mips_insn32_frame_cache (next_frame,
+ this_cache);
+ trad_frame_get_prev_register (next_frame, info->saved_regs, regnum,
+ optimizedp, lvalp, addrp, realnump, valuep);
+}
-static int
-compare_pdr_entries (const void *a, const void *b)
+static const struct frame_unwind mips_insn32_frame_unwind =
{
- CORE_ADDR lhs = bfd_get_32 (the_bfd, (bfd_byte *) a);
- CORE_ADDR rhs = bfd_get_32 (the_bfd, (bfd_byte *) b);
+ NORMAL_FRAME,
+ mips_insn32_frame_this_id,
+ mips_insn32_frame_prev_register
+};
- if (lhs < rhs)
- return -1;
- else if (lhs == rhs)
- return 0;
- else
- return 1;
+static const struct frame_unwind *
+mips_insn32_frame_sniffer (struct frame_info *next_frame)
+{
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
+ if (! mips_pc_is_mips16 (pc))
+ return &mips_insn32_frame_unwind;
+ return NULL;
}
-static mips_extra_func_info_t
-non_heuristic_proc_desc (CORE_ADDR pc, CORE_ADDR *addrptr)
+static CORE_ADDR
+mips_insn32_frame_base_address (struct frame_info *next_frame,
+ void **this_cache)
{
- CORE_ADDR startaddr;
- mips_extra_func_info_t proc_desc;
- struct block *b = block_for_pc (pc);
- struct symbol *sym;
- struct obj_section *sec;
- struct mips_objfile_private *priv;
+ struct mips_frame_cache *info = mips_insn32_frame_cache (next_frame,
+ this_cache);
+ return info->base;
+}
- find_pc_partial_function (pc, NULL, &startaddr, NULL);
- if (addrptr)
- *addrptr = startaddr;
+static const struct frame_base mips_insn32_frame_base =
+{
+ &mips_insn32_frame_unwind,
+ mips_insn32_frame_base_address,
+ mips_insn32_frame_base_address,
+ mips_insn32_frame_base_address
+};
- priv = NULL;
+static const struct frame_base *
+mips_insn32_frame_base_sniffer (struct frame_info *next_frame)
+{
+ if (mips_insn32_frame_sniffer (next_frame) != NULL)
+ return &mips_insn32_frame_base;
+ else
+ return NULL;
+}
- sec = find_pc_section (pc);
- if (sec != NULL)
- {
- priv = (struct mips_objfile_private *) objfile_data (sec->objfile, mips_pdr_data);
+static struct trad_frame_cache *
+mips_stub_frame_cache (struct frame_info *next_frame, void **this_cache)
+{
+ CORE_ADDR pc;
+ CORE_ADDR start_addr;
+ CORE_ADDR stack_addr;
+ struct trad_frame_cache *this_trad_cache;
- /* Search the ".pdr" section generated by GAS. This includes most of
- the information normally found in ECOFF PDRs. */
+ if ((*this_cache) != NULL)
+ return (*this_cache);
+ this_trad_cache = trad_frame_cache_zalloc (next_frame);
+ (*this_cache) = this_trad_cache;
- the_bfd = sec->objfile->obfd;
- if (priv == NULL
- && (the_bfd->format == bfd_object
- && bfd_get_flavour (the_bfd) == bfd_target_elf_flavour
- && elf_elfheader (the_bfd)->e_ident[EI_CLASS] == ELFCLASS64))
- {
- /* Right now GAS only outputs the address as a four-byte sequence.
- This means that we should not bother with this method on 64-bit
- targets (until that is fixed). */
-
- priv = obstack_alloc (&sec->objfile->objfile_obstack,
- sizeof (struct mips_objfile_private));
- priv->size = 0;
- set_objfile_data (sec->objfile, mips_pdr_data, priv);
- }
- else if (priv == NULL)
- {
- asection *bfdsec;
+ /* The return address is in the link register. */
+ trad_frame_set_reg_realreg (this_trad_cache, PC_REGNUM, MIPS_RA_REGNUM);
- priv = obstack_alloc (&sec->objfile->objfile_obstack,
- sizeof (struct mips_objfile_private));
+ /* Frame ID, since it's a frameless / stackless function, no stack
+ space is allocated and SP on entry is the current SP. */
+ pc = frame_pc_unwind (next_frame);
+ find_pc_partial_function (pc, NULL, &start_addr, NULL);
+ stack_addr = frame_unwind_register_signed (next_frame, MIPS_SP_REGNUM);
+ trad_frame_set_id (this_trad_cache, frame_id_build (start_addr, stack_addr));
- bfdsec = bfd_get_section_by_name (sec->objfile->obfd, ".pdr");
- if (bfdsec != NULL)
- {
- priv->size = bfd_section_size (sec->objfile->obfd, bfdsec);
- priv->contents = obstack_alloc (&sec->objfile->objfile_obstack,
- priv->size);
- bfd_get_section_contents (sec->objfile->obfd, bfdsec,
- priv->contents, 0, priv->size);
-
- /* In general, the .pdr section is sorted. However, in the
- presence of multiple code sections (and other corner cases)
- it can become unsorted. Sort it so that we can use a faster
- binary search. */
- qsort (priv->contents, priv->size / 32, 32,
- compare_pdr_entries);
- }
- else
- priv->size = 0;
+ /* Assume that the frame's base is the same as the
+ stack-pointer. */
+ trad_frame_set_this_base (this_trad_cache, stack_addr);
- set_objfile_data (sec->objfile, mips_pdr_data, priv);
- }
- the_bfd = NULL;
+ return this_trad_cache;
+}
- if (priv->size != 0)
- {
- int low, mid, high;
- char *ptr;
- CORE_ADDR pdr_pc;
-
- low = 0;
- high = priv->size / 32;
-
- /* We've found a .pdr section describing this objfile. We want to
- find the entry which describes this code address. The .pdr
- information is not very descriptive; we have only a function
- start address. We have to look for the closest entry, because
- the local symbol at the beginning of this function may have
- been stripped - so if we ask the symbol table for the start
- address we may get a preceding global function. */
-
- /* First, find the last .pdr entry starting at or before PC. */
- do
- {
- mid = (low + high) / 2;
+static void
+mips_stub_frame_this_id (struct frame_info *next_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ struct trad_frame_cache *this_trad_cache
+ = mips_stub_frame_cache (next_frame, this_cache);
+ trad_frame_get_id (this_trad_cache, this_id);
+}
- ptr = priv->contents + mid * 32;
- pdr_pc = bfd_get_signed_32 (sec->objfile->obfd, ptr);
- pdr_pc += ANOFFSET (sec->objfile->section_offsets,
- SECT_OFF_TEXT (sec->objfile));
+static void
+mips_stub_frame_prev_register (struct frame_info *next_frame,
+ void **this_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, void *valuep)
+{
+ struct trad_frame_cache *this_trad_cache
+ = mips_stub_frame_cache (next_frame, this_cache);
+ trad_frame_get_register (this_trad_cache, next_frame, regnum, optimizedp,
+ lvalp, addrp, realnump, valuep);
+}
- if (pdr_pc > pc)
- high = mid;
- else
- low = mid + 1;
- }
- while (low != high);
+static const struct frame_unwind mips_stub_frame_unwind =
+{
+ NORMAL_FRAME,
+ mips_stub_frame_this_id,
+ mips_stub_frame_prev_register
+};
- /* Both low and high point one past the PDR of interest. If
- both are zero, that means this PC is before any region
- covered by a PDR, i.e. pdr_pc for the first PDR entry is
- greater than PC. */
- if (low > 0)
- {
- ptr = priv->contents + (low - 1) * 32;
- pdr_pc = bfd_get_signed_32 (sec->objfile->obfd, ptr);
- pdr_pc += ANOFFSET (sec->objfile->section_offsets,
- SECT_OFF_TEXT (sec->objfile));
- }
+static const struct frame_unwind *
+mips_stub_frame_sniffer (struct frame_info *next_frame)
+{
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
+ if (in_plt_section (pc, NULL))
+ return &mips_stub_frame_unwind;
+ else
+ return NULL;
+}
- /* We don't have a range, so we have no way to know for sure
- whether we're in the correct PDR or a PDR for a preceding
- function and the current function was a stripped local
- symbol. But if the PDR's PC is at least as great as the
- best guess from the symbol table, assume that it does cover
- the right area; if a .pdr section is present at all then
- nearly every function will have an entry. The biggest exception
- will be the dynamic linker stubs; conveniently these are
- placed before .text instead of after. */
-
- if (pc >= pdr_pc && pdr_pc >= startaddr)
- {
- struct symbol *sym = find_pc_function (pc);
-
- if (addrptr)
- *addrptr = pdr_pc;
-
- /* Fill in what we need of the proc_desc. */
- proc_desc = (mips_extra_func_info_t)
- obstack_alloc (&sec->objfile->objfile_obstack,
- sizeof (struct mips_extra_func_info));
- PROC_LOW_ADDR (proc_desc) = pdr_pc;
-
- /* Only used for dummy frames. */
- PROC_HIGH_ADDR (proc_desc) = 0;
-
- PROC_FRAME_OFFSET (proc_desc)
- = bfd_get_32 (sec->objfile->obfd, ptr + 20);
- PROC_FRAME_REG (proc_desc) = bfd_get_32 (sec->objfile->obfd,
- ptr + 24);
- PROC_FRAME_ADJUST (proc_desc) = 0;
- PROC_REG_MASK (proc_desc) = bfd_get_32 (sec->objfile->obfd,
- ptr + 4);
- PROC_FREG_MASK (proc_desc) = bfd_get_32 (sec->objfile->obfd,
- ptr + 12);
- PROC_REG_OFFSET (proc_desc) = bfd_get_32 (sec->objfile->obfd,
- ptr + 8);
- PROC_FREG_OFFSET (proc_desc)
- = bfd_get_32 (sec->objfile->obfd, ptr + 16);
- PROC_PC_REG (proc_desc) = bfd_get_32 (sec->objfile->obfd,
- ptr + 28);
- proc_desc->pdr.isym = (long) sym;
-
- return proc_desc;
- }
- }
- }
+static CORE_ADDR
+mips_stub_frame_base_address (struct frame_info *next_frame,
+ void **this_cache)
+{
+ struct trad_frame_cache *this_trad_cache
+ = mips_stub_frame_cache (next_frame, this_cache);
+ return trad_frame_get_this_base (this_trad_cache);
+}
- if (b == NULL)
+static const struct frame_base mips_stub_frame_base =
+{
+ &mips_stub_frame_unwind,
+ mips_stub_frame_base_address,
+ mips_stub_frame_base_address,
+ mips_stub_frame_base_address
+};
+
+static const struct frame_base *
+mips_stub_frame_base_sniffer (struct frame_info *next_frame)
+{
+ if (mips_stub_frame_sniffer (next_frame) != NULL)
+ return &mips_stub_frame_base;
+ else
return NULL;
+}
- if (startaddr > BLOCK_START (b))
+static CORE_ADDR
+read_next_frame_reg (struct frame_info *fi, int regno)
+{
+ /* Always a pseudo. */
+ gdb_assert (regno >= NUM_REGS);
+ if (fi == NULL)
{
- /* This is the "pathological" case referred to in a comment in
- print_frame_info. It might be better to move this check into
- symbol reading. */
- return NULL;
+ LONGEST val;
+ regcache_cooked_read_signed (current_regcache, regno, &val);
+ return val;
}
+ else
+ return frame_unwind_register_signed (fi, regno);
- sym = lookup_symbol (MIPS_EFI_SYMBOL_NAME, b, LABEL_DOMAIN, 0, NULL);
+}
- /* If we never found a PDR for this function in symbol reading, then
- examine prologues to find the information. */
- if (sym)
- {
- proc_desc = (mips_extra_func_info_t) SYMBOL_VALUE (sym);
- if (PROC_FRAME_REG (proc_desc) == -1)
- return NULL;
- else
- return proc_desc;
- }
+/* mips_addr_bits_remove - remove useless address bits */
+
+static CORE_ADDR
+mips_addr_bits_remove (CORE_ADDR addr)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ if (mips_mask_address_p (tdep) && (((ULONGEST) addr) >> 32 == 0xffffffffUL))
+ /* This hack is a work-around for existing boards using PMON, the
+ simulator, and any other 64-bit targets that doesn't have true
+ 64-bit addressing. On these targets, the upper 32 bits of
+ addresses are ignored by the hardware. Thus, the PC or SP are
+ likely to have been sign extended to all 1s by instruction
+ sequences that load 32-bit addresses. For example, a typical
+ piece of code that loads an address is this:
+
+ lui $r2, <upper 16 bits>
+ ori $r2, <lower 16 bits>
+
+ But the lui sign-extends the value such that the upper 32 bits
+ may be all 1s. The workaround is simply to mask off these
+ bits. In the future, gcc may be changed to support true 64-bit
+ addressing, and this masking will have to be disabled. */
+ return addr &= 0xffffffffUL;
else
- return NULL;
+ return addr;
}
+/* mips_software_single_step() is called just before we want to resume
+ the inferior, if we want to single-step it but there is no hardware
+ or kernel single-step support (MIPS on GNU/Linux for example). We find
+ the target of the coming instruction and breakpoint it.
-static mips_extra_func_info_t
-find_proc_desc (CORE_ADDR pc, struct frame_info *next_frame, int cur_frame)
-{
- mips_extra_func_info_t proc_desc;
- CORE_ADDR startaddr = 0;
+ single_step is also called just after the inferior stops. If we had
+ set up a simulated single-step, we undo our damage. */
- proc_desc = non_heuristic_proc_desc (pc, &startaddr);
+void
+mips_software_single_step (enum target_signal sig, int insert_breakpoints_p)
+{
+ static CORE_ADDR next_pc;
+ typedef char binsn_quantum[BREAKPOINT_MAX];
+ static binsn_quantum break_mem;
+ CORE_ADDR pc;
- if (proc_desc)
+ if (insert_breakpoints_p)
{
- /* IF this is the topmost frame AND
- * (this proc does not have debugging information OR
- * the PC is in the procedure prologue)
- * THEN create a "heuristic" proc_desc (by analyzing
- * the actual code) to replace the "official" proc_desc.
- */
- if (next_frame == NULL)
- {
- struct symtab_and_line val;
- struct symbol *proc_symbol =
- PROC_DESC_IS_DUMMY (proc_desc) ? 0 : PROC_SYMBOL (proc_desc);
+ pc = read_register (mips_regnum (current_gdbarch)->pc);
+ next_pc = mips_next_pc (pc);
- if (proc_symbol)
- {
- val = find_pc_line (BLOCK_START
- (SYMBOL_BLOCK_VALUE (proc_symbol)), 0);
- val.pc = val.end ? val.end : pc;
- }
- if (!proc_symbol || pc < val.pc)
- {
- mips_extra_func_info_t found_heuristic =
- heuristic_proc_desc (PROC_LOW_ADDR (proc_desc),
- pc, next_frame, cur_frame);
- if (found_heuristic)
- proc_desc = found_heuristic;
- }
- }
+ target_insert_breakpoint (next_pc, break_mem);
}
else
- {
- /* Is linked_proc_desc_table really necessary? It only seems to be used
- by procedure call dummys. However, the procedures being called ought
- to have their own proc_descs, and even if they don't,
- heuristic_proc_desc knows how to create them! */
+ target_remove_breakpoint (next_pc, break_mem);
+}
+
+/* Test whether the PC points to the return instruction at the
+ end of a function. */
- struct linked_proc_info *link;
+static int
+mips_about_to_return (CORE_ADDR pc)
+{
+ if (mips_pc_is_mips16 (pc))
+ /* This mips16 case isn't necessarily reliable. Sometimes the compiler
+ generates a "jr $ra"; other times it generates code to load
+ the return address from the stack to an accessible register (such
+ as $a3), then a "jr" using that register. This second case
+ is almost impossible to distinguish from an indirect jump
+ used for switch statements, so we don't even try. */
+ return mips_fetch_instruction (pc) == 0xe820; /* jr $ra */
+ else
+ return mips_fetch_instruction (pc) == 0x3e00008; /* jr $ra */
+}
- for (link = linked_proc_desc_table; link; link = link->next)
- if (PROC_LOW_ADDR (&link->info) <= pc
- && PROC_HIGH_ADDR (&link->info) > pc)
- return &link->info;
- if (startaddr == 0)
- startaddr = heuristic_proc_start (pc);
+/* This fencepost looks highly suspicious to me. Removing it also
+ seems suspicious as it could affect remote debugging across serial
+ lines. */
- proc_desc = heuristic_proc_desc (startaddr, pc, next_frame, cur_frame);
- }
- return proc_desc;
-}
+static CORE_ADDR
+heuristic_proc_start (CORE_ADDR pc)
+{
+ CORE_ADDR start_pc;
+ CORE_ADDR fence;
+ int instlen;
+ int seen_adjsp = 0;
-/* MIPS stack frames are almost impenetrable. When execution stops,
- we basically have to look at symbol information for the function
- that we stopped in, which tells us *which* register (if any) is
- the base of the frame pointer, and what offset from that register
- the frame itself is at.
+ pc = ADDR_BITS_REMOVE (pc);
+ start_pc = pc;
+ fence = start_pc - heuristic_fence_post;
+ if (start_pc == 0)
+ return 0;
- This presents a problem when trying to examine a stack in memory
- (that isn't executing at the moment), using the "frame" command. We
- don't have a PC, nor do we have any registers except SP.
+ if (heuristic_fence_post == UINT_MAX || fence < VM_MIN_ADDRESS)
+ fence = VM_MIN_ADDRESS;
- This routine takes two arguments, SP and PC, and tries to make the
- cached frames look as if these two arguments defined a frame on the
- cache. This allows the rest of info frame to extract the important
- arguments without difficulty. */
+ instlen = mips_pc_is_mips16 (pc) ? MIPS_INSN16_SIZE : MIPS_INSN32_SIZE;
-struct frame_info *
-setup_arbitrary_frame (int argc, CORE_ADDR *argv)
-{
- if (argc != 2)
- error ("MIPS frame specifications require two arguments: sp and pc");
+ /* search back for previous return */
+ for (start_pc -= instlen;; start_pc -= instlen)
+ if (start_pc < fence)
+ {
+ /* It's not clear to me why we reach this point when
+ stop_soon, but with this test, at least we
+ don't print out warnings for every child forked (eg, on
+ decstation). 22apr93 rich@cygnus.com. */
+ if (stop_soon == NO_STOP_QUIETLY)
+ {
+ static int blurb_printed = 0;
+
+ warning ("GDB can't find the start of the function at 0x%s.",
+ paddr_nz (pc));
+
+ if (!blurb_printed)
+ {
+ /* This actually happens frequently in embedded
+ development, when you first connect to a board
+ and your stack pointer and pc are nowhere in
+ particular. This message needs to give people
+ in that situation enough information to
+ determine that it's no big deal. */
+ printf_filtered ("\n\
+ GDB is unable to find the start of the function at 0x%s\n\
+and thus can't determine the size of that function's stack frame.\n\
+This means that GDB may be unable to access that stack frame, or\n\
+the frames below it.\n\
+ This problem is most likely caused by an invalid program counter or\n\
+stack pointer.\n\
+ However, if you think GDB should simply search farther back\n\
+from 0x%s for code which looks like the beginning of a\n\
+function, you can increase the range of the search using the `set\n\
+heuristic-fence-post' command.\n", paddr_nz (pc), paddr_nz (pc));
+ blurb_printed = 1;
+ }
+ }
- return create_new_frame (argv[0], argv[1]);
+ return 0;
+ }
+ else if (mips_pc_is_mips16 (start_pc))
+ {
+ unsigned short inst;
+
+ /* On MIPS16, any one of the following is likely to be the
+ start of a function:
+ entry
+ addiu sp,-n
+ daddiu sp,-n
+ extend -n followed by 'addiu sp,+n' or 'daddiu sp,+n' */
+ inst = mips_fetch_instruction (start_pc);
+ if (((inst & 0xf81f) == 0xe809 && (inst & 0x700) != 0x700) /* entry */
+ || (inst & 0xff80) == 0x6380 /* addiu sp,-n */
+ || (inst & 0xff80) == 0xfb80 /* daddiu sp,-n */
+ || ((inst & 0xf810) == 0xf010 && seen_adjsp)) /* extend -n */
+ break;
+ else if ((inst & 0xff00) == 0x6300 /* addiu sp */
+ || (inst & 0xff00) == 0xfb00) /* daddiu sp */
+ seen_adjsp = 1;
+ else
+ seen_adjsp = 0;
+ }
+ else if (mips_about_to_return (start_pc))
+ {
+ /* Skip return and its delay slot. */
+ start_pc += 2 * MIPS_INSN32_SIZE;
+ break;
+ }
+
+ return start_pc;
}
+struct mips_objfile_private
+{
+ bfd_size_type size;
+ char *contents;
+};
+
/* According to the current ABI, should the type be passed in a
floating-point register (assuming that there is space)? When there
is no FPU, FP are not even considered as possibile candidates for
}
else if (typecode == TYPE_CODE_UNION)
{
- int i, n;
-
- n = TYPE_NFIELDS (type);
- for (i = 0; i < n; i++)
- if (mips_type_needs_double_align (TYPE_FIELD_TYPE (type, i)))
- return 1;
- return 0;
- }
- return 0;
-}
-
-/* Adjust the address downward (direction of stack growth) so that it
- is correctly aligned for a new stack frame. */
-static CORE_ADDR
-mips_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
-{
- return align_down (addr, 16);
-}
-
-/* Determine how a return value is stored within the MIPS register
- file, given the return type `valtype'. */
-
-struct return_value_word
-{
- int len;
- int reg;
- int reg_offset;
- int buf_offset;
-};
-
-static void
-return_value_location (struct type *valtype,
- struct return_value_word *hi,
- struct return_value_word *lo)
-{
- int len = TYPE_LENGTH (valtype);
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
-
- if (TYPE_CODE (valtype) == TYPE_CODE_FLT
- && ((MIPS_FPU_TYPE == MIPS_FPU_DOUBLE && (len == 4 || len == 8))
- || (MIPS_FPU_TYPE == MIPS_FPU_SINGLE && len == 4)))
- {
- if (mips_abi_regsize (current_gdbarch) < 8 && len == 8)
- {
- /* We need to break a 64bit float in two 32 bit halves and
- spread them across a floating-point register pair. */
- lo->buf_offset = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? 4 : 0;
- hi->buf_offset = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? 0 : 4;
- lo->reg_offset = ((TARGET_BYTE_ORDER == BFD_ENDIAN_BIG
- && register_size (current_gdbarch,
- mips_regnum (current_gdbarch)->
- fp0) == 8) ? 4 : 0);
- hi->reg_offset = lo->reg_offset;
- lo->reg = mips_regnum (current_gdbarch)->fp0 + 0;
- hi->reg = mips_regnum (current_gdbarch)->fp0 + 1;
- lo->len = 4;
- hi->len = 4;
- }
- else
- {
- /* The floating point value fits in a single floating-point
- register. */
- lo->reg_offset = ((TARGET_BYTE_ORDER == BFD_ENDIAN_BIG
- && register_size (current_gdbarch,
- mips_regnum (current_gdbarch)->
- fp0) == 8
- && len == 4) ? 4 : 0);
- lo->reg = mips_regnum (current_gdbarch)->fp0;
- lo->len = len;
- lo->buf_offset = 0;
- hi->len = 0;
- hi->reg_offset = 0;
- hi->buf_offset = 0;
- hi->reg = 0;
- }
- }
- else
- {
- /* Locate a result possibly spread across two registers. */
- int regnum = 2;
- lo->reg = regnum + 0;
- hi->reg = regnum + 1;
- if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG
- && len < mips_abi_regsize (current_gdbarch))
- {
- /* "un-left-justify" the value in the low register */
- lo->reg_offset = mips_abi_regsize (current_gdbarch) - len;
- lo->len = len;
- hi->reg_offset = 0;
- hi->len = 0;
- }
- else if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG && len > mips_abi_regsize (current_gdbarch) /* odd-size structs */
- && len < mips_abi_regsize (current_gdbarch) * 2
- && (TYPE_CODE (valtype) == TYPE_CODE_STRUCT ||
- TYPE_CODE (valtype) == TYPE_CODE_UNION))
- {
- /* "un-left-justify" the value spread across two registers. */
- lo->reg_offset = 2 * mips_abi_regsize (current_gdbarch) - len;
- lo->len = mips_abi_regsize (current_gdbarch) - lo->reg_offset;
- hi->reg_offset = 0;
- hi->len = len - lo->len;
- }
- else
- {
- /* Only perform a partial copy of the second register. */
- lo->reg_offset = 0;
- hi->reg_offset = 0;
- if (len > mips_abi_regsize (current_gdbarch))
- {
- lo->len = mips_abi_regsize (current_gdbarch);
- hi->len = len - mips_abi_regsize (current_gdbarch);
- }
- else
- {
- lo->len = len;
- hi->len = 0;
- }
- }
- if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG
- && register_size (current_gdbarch, regnum) == 8
- && mips_abi_regsize (current_gdbarch) == 4)
- {
- /* Account for the fact that only the least-signficant part
- of the register is being used */
- lo->reg_offset += 4;
- hi->reg_offset += 4;
- }
- lo->buf_offset = 0;
- hi->buf_offset = lo->len;
- }
-}
-
-/* Should call_function allocate stack space for a struct return? */
+ int i, n;
-static int
-mips_eabi_use_struct_convention (int gcc_p, struct type *type)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
- return (TYPE_LENGTH (type) > 2 * mips_abi_regsize (current_gdbarch));
+ n = TYPE_NFIELDS (type);
+ for (i = 0; i < n; i++)
+ if (mips_type_needs_double_align (TYPE_FIELD_TYPE (type, i)))
+ return 1;
+ return 0;
+ }
+ return 0;
}
-/* Should call_function pass struct by reference?
- For each architecture, structs are passed either by
- value or by reference, depending on their size. */
-
-static int
-mips_eabi_reg_struct_has_addr (int gcc_p, struct type *type)
+/* Adjust the address downward (direction of stack growth) so that it
+ is correctly aligned for a new stack frame. */
+static CORE_ADDR
+mips_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
{
- enum type_code typecode = TYPE_CODE (check_typedef (type));
- int len = TYPE_LENGTH (check_typedef (type));
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
-
- if (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION)
- return (len > mips_abi_regsize (current_gdbarch));
-
- return 0;
+ return align_down (addr, 16);
}
static CORE_ADDR
/* For shared libraries, "t9" needs to point at the function
address. */
- regcache_cooked_write_signed (regcache, T9_REGNUM, func_addr);
+ regcache_cooked_write_signed (regcache, MIPS_T9_REGNUM, func_addr);
/* Set the return address register to point to the entry point of
the program, where a breakpoint lies in wait. */
- regcache_cooked_write_signed (regcache, RA_REGNUM, bp_addr);
+ regcache_cooked_write_signed (regcache, MIPS_RA_REGNUM, bp_addr);
/* First ensure that the stack and structure return address (if any)
are properly aligned. The stack has to be at least 64-bit
than necessary for EABI, because the first few arguments are
passed in registers, but that's OK. */
for (argnum = 0; argnum < nargs; argnum++)
- len += align_up (TYPE_LENGTH (VALUE_TYPE (args[argnum])),
+ len += align_up (TYPE_LENGTH (value_type (args[argnum])),
mips_stack_argsize (gdbarch));
sp -= align_up (len, 16);
paddr_nz (sp), (long) align_up (len, 16));
/* Initialize the integer and float register pointers. */
- argreg = A0_REGNUM;
+ argreg = MIPS_A0_REGNUM;
float_argreg = mips_fpa0_regnum (current_gdbarch);
/* The struct_return pointer occupies the first parameter-passing reg. */
char *val;
char valbuf[MAX_REGISTER_SIZE];
struct value *arg = args[argnum];
- struct type *arg_type = check_typedef (VALUE_TYPE (arg));
+ struct type *arg_type = check_typedef (value_type (arg));
int len = TYPE_LENGTH (arg_type);
enum type_code typecode = TYPE_CODE (arg_type);
fprintf_unfiltered (gdb_stdlog, "\n");
}
- regcache_cooked_write_signed (regcache, SP_REGNUM, sp);
+ regcache_cooked_write_signed (regcache, MIPS_SP_REGNUM, sp);
/* Return adjusted stack pointer. */
return sp;
}
-/* Given a return value in `regbuf' with a type `valtype', extract and
- copy its value into `valbuf'. */
+/* Determin the return value convention being used. */
-static void
-mips_eabi_extract_return_value (struct type *valtype,
- char regbuf[], char *valbuf)
+static enum return_value_convention
+mips_eabi_return_value (struct gdbarch *gdbarch,
+ struct type *type, struct regcache *regcache,
+ void *readbuf, const void *writebuf)
{
- struct return_value_word lo;
- struct return_value_word hi;
- return_value_location (valtype, &hi, &lo);
-
- memcpy (valbuf + lo.buf_offset,
- regbuf + DEPRECATED_REGISTER_BYTE (NUM_REGS + lo.reg) +
- lo.reg_offset, lo.len);
-
- if (hi.len > 0)
- memcpy (valbuf + hi.buf_offset,
- regbuf + DEPRECATED_REGISTER_BYTE (NUM_REGS + hi.reg) +
- hi.reg_offset, hi.len);
+ if (TYPE_LENGTH (type) > 2 * mips_abi_regsize (gdbarch))
+ return RETURN_VALUE_STRUCT_CONVENTION;
+ if (readbuf)
+ memset (readbuf, 0, TYPE_LENGTH (type));
+ return RETURN_VALUE_REGISTER_CONVENTION;
}
-/* Given a return value in `valbuf' with a type `valtype', write it's
- value into the appropriate register. */
-
-static void
-mips_eabi_store_return_value (struct type *valtype, char *valbuf)
-{
- char raw_buffer[MAX_REGISTER_SIZE];
- struct return_value_word lo;
- struct return_value_word hi;
- return_value_location (valtype, &hi, &lo);
-
- memset (raw_buffer, 0, sizeof (raw_buffer));
- memcpy (raw_buffer + lo.reg_offset, valbuf + lo.buf_offset, lo.len);
- deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (lo.reg),
- raw_buffer, register_size (current_gdbarch,
- lo.reg));
-
- if (hi.len > 0)
- {
- memset (raw_buffer, 0, sizeof (raw_buffer));
- memcpy (raw_buffer + hi.reg_offset, valbuf + hi.buf_offset, hi.len);
- deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (hi.reg),
- raw_buffer,
- register_size (current_gdbarch,
- hi.reg));
- }
-}
/* N32/N64 ABI stuff. */
/* For shared libraries, "t9" needs to point at the function
address. */
- regcache_cooked_write_signed (regcache, T9_REGNUM, func_addr);
+ regcache_cooked_write_signed (regcache, MIPS_T9_REGNUM, func_addr);
/* Set the return address register to point to the entry point of
the program, where a breakpoint lies in wait. */
- regcache_cooked_write_signed (regcache, RA_REGNUM, bp_addr);
+ regcache_cooked_write_signed (regcache, MIPS_RA_REGNUM, bp_addr);
/* First ensure that the stack and structure return address (if any)
are properly aligned. The stack has to be at least 64-bit
/* Now make space on the stack for the args. */
for (argnum = 0; argnum < nargs; argnum++)
- len += align_up (TYPE_LENGTH (VALUE_TYPE (args[argnum])),
+ len += align_up (TYPE_LENGTH (value_type (args[argnum])),
mips_stack_argsize (gdbarch));
sp -= align_up (len, 16);
paddr_nz (sp), (long) align_up (len, 16));
/* Initialize the integer and float register pointers. */
- argreg = A0_REGNUM;
+ argreg = MIPS_A0_REGNUM;
float_argreg = mips_fpa0_regnum (current_gdbarch);
/* The struct_return pointer occupies the first parameter-passing reg. */
{
char *val;
struct value *arg = args[argnum];
- struct type *arg_type = check_typedef (VALUE_TYPE (arg));
+ struct type *arg_type = check_typedef (value_type (arg));
int len = TYPE_LENGTH (arg_type);
enum type_code typecode = TYPE_CODE (arg_type);
fprintf_unfiltered (gdb_stdlog, "\n");
}
- regcache_cooked_write_signed (regcache, SP_REGNUM, sp);
+ regcache_cooked_write_signed (regcache, MIPS_SP_REGNUM, sp);
/* Return adjusted stack pointer. */
return sp;
mips_xfer_lower. */
int offset;
int regnum;
- for (offset = 0, regnum = V0_REGNUM;
+ for (offset = 0, regnum = MIPS_V0_REGNUM;
offset < TYPE_LENGTH (type);
offset += register_size (current_gdbarch, regnum), regnum++)
{
justified. */
int offset;
int regnum;
- for (offset = 0, regnum = V0_REGNUM;
+ for (offset = 0, regnum = MIPS_V0_REGNUM;
offset < TYPE_LENGTH (type);
offset += register_size (current_gdbarch, regnum), regnum++)
{
/* For shared libraries, "t9" needs to point at the function
address. */
- regcache_cooked_write_signed (regcache, T9_REGNUM, func_addr);
+ regcache_cooked_write_signed (regcache, MIPS_T9_REGNUM, func_addr);
/* Set the return address register to point to the entry point of
the program, where a breakpoint lies in wait. */
- regcache_cooked_write_signed (regcache, RA_REGNUM, bp_addr);
+ regcache_cooked_write_signed (regcache, MIPS_RA_REGNUM, bp_addr);
/* First ensure that the stack and structure return address (if any)
are properly aligned. The stack has to be at least 64-bit
/* Now make space on the stack for the args. */
for (argnum = 0; argnum < nargs; argnum++)
- len += align_up (TYPE_LENGTH (VALUE_TYPE (args[argnum])),
+ len += align_up (TYPE_LENGTH (value_type (args[argnum])),
mips_stack_argsize (gdbarch));
sp -= align_up (len, 16);
paddr_nz (sp), (long) align_up (len, 16));
/* Initialize the integer and float register pointers. */
- argreg = A0_REGNUM;
+ argreg = MIPS_A0_REGNUM;
float_argreg = mips_fpa0_regnum (current_gdbarch);
/* The struct_return pointer occupies the first parameter-passing reg. */
{
char *val;
struct value *arg = args[argnum];
- struct type *arg_type = check_typedef (VALUE_TYPE (arg));
+ struct type *arg_type = check_typedef (value_type (arg));
int len = TYPE_LENGTH (arg_type);
enum type_code typecode = TYPE_CODE (arg_type);
fprintf_unfiltered (gdb_stdlog, "\n");
}
- regcache_cooked_write_signed (regcache, SP_REGNUM, sp);
+ regcache_cooked_write_signed (regcache, MIPS_SP_REGNUM, sp);
/* Return adjusted stack pointer. */
return sp;
mips_xfer_lower. */
int offset;
int regnum;
- for (offset = 0, regnum = V0_REGNUM;
+ for (offset = 0, regnum = MIPS_V0_REGNUM;
offset < TYPE_LENGTH (type);
offset += register_size (current_gdbarch, regnum), regnum++)
{
the ISA. mips_stack_argsize controls this. */
int offset;
int regnum;
- for (offset = 0, regnum = V0_REGNUM;
+ for (offset = 0, regnum = MIPS_V0_REGNUM;
offset < TYPE_LENGTH (type);
offset += mips_stack_argsize (gdbarch), regnum++)
{
/* For shared libraries, "t9" needs to point at the function
address. */
- regcache_cooked_write_signed (regcache, T9_REGNUM, func_addr);
+ regcache_cooked_write_signed (regcache, MIPS_T9_REGNUM, func_addr);
/* Set the return address register to point to the entry point of
the program, where a breakpoint lies in wait. */
- regcache_cooked_write_signed (regcache, RA_REGNUM, bp_addr);
+ regcache_cooked_write_signed (regcache, MIPS_RA_REGNUM, bp_addr);
/* First ensure that the stack and structure return address (if any)
are properly aligned. The stack has to be at least 64-bit
/* Now make space on the stack for the args. */
for (argnum = 0; argnum < nargs; argnum++)
- len += align_up (TYPE_LENGTH (VALUE_TYPE (args[argnum])),
+ len += align_up (TYPE_LENGTH (value_type (args[argnum])),
mips_stack_argsize (gdbarch));
sp -= align_up (len, 16);
paddr_nz (sp), (long) align_up (len, 16));
/* Initialize the integer and float register pointers. */
- argreg = A0_REGNUM;
+ argreg = MIPS_A0_REGNUM;
float_argreg = mips_fpa0_regnum (current_gdbarch);
/* The struct_return pointer occupies the first parameter-passing reg. */
{
char *val;
struct value *arg = args[argnum];
- struct type *arg_type = check_typedef (VALUE_TYPE (arg));
+ struct type *arg_type = check_typedef (value_type (arg));
int len = TYPE_LENGTH (arg_type);
enum type_code typecode = TYPE_CODE (arg_type);
fprintf_unfiltered (gdb_stdlog, "\n");
}
- regcache_cooked_write_signed (regcache, SP_REGNUM, sp);
+ regcache_cooked_write_signed (regcache, MIPS_SP_REGNUM, sp);
/* Return adjusted stack pointer. */
return sp;
}
-static void
-mips_o64_extract_return_value (struct type *valtype,
- char regbuf[], char *valbuf)
-{
- struct return_value_word lo;
- struct return_value_word hi;
- return_value_location (valtype, &hi, &lo);
-
- memcpy (valbuf + lo.buf_offset,
- regbuf + DEPRECATED_REGISTER_BYTE (NUM_REGS + lo.reg) +
- lo.reg_offset, lo.len);
-
- if (hi.len > 0)
- memcpy (valbuf + hi.buf_offset,
- regbuf + DEPRECATED_REGISTER_BYTE (NUM_REGS + hi.reg) +
- hi.reg_offset, hi.len);
-}
-
-static void
-mips_o64_store_return_value (struct type *valtype, char *valbuf)
+static enum return_value_convention
+mips_o64_return_value (struct gdbarch *gdbarch,
+ struct type *type, struct regcache *regcache,
+ void *readbuf, const void *writebuf)
{
- char raw_buffer[MAX_REGISTER_SIZE];
- struct return_value_word lo;
- struct return_value_word hi;
- return_value_location (valtype, &hi, &lo);
-
- memset (raw_buffer, 0, sizeof (raw_buffer));
- memcpy (raw_buffer + lo.reg_offset, valbuf + lo.buf_offset, lo.len);
- deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (lo.reg),
- raw_buffer, register_size (current_gdbarch,
- lo.reg));
-
- if (hi.len > 0)
- {
- memset (raw_buffer, 0, sizeof (raw_buffer));
- memcpy (raw_buffer + hi.reg_offset, valbuf + hi.buf_offset, hi.len);
- deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (hi.reg),
- raw_buffer,
- register_size (current_gdbarch,
- hi.reg));
- }
+ return RETURN_VALUE_STRUCT_CONVENTION;
}
/* Floating point register management.
/* Is this a branch with a delay slot? */
-static int is_delayed (unsigned long);
-
static int
is_delayed (unsigned long insn)
{
}
int
-mips_step_skips_delay (CORE_ADDR pc)
+mips_single_step_through_delay (struct gdbarch *gdbarch,
+ struct frame_info *frame)
{
- char buf[MIPS_INSTLEN];
+ CORE_ADDR pc = get_frame_pc (frame);
+ char buf[MIPS_INSN32_SIZE];
/* There is no branch delay slot on MIPS16. */
- if (pc_is_mips16 (pc))
+ if (mips_pc_is_mips16 (pc))
return 0;
- if (target_read_memory (pc, buf, MIPS_INSTLEN) != 0)
- /* If error reading memory, guess that it is not a delayed branch. */
+ if (!safe_frame_unwind_memory (frame, pc, buf, sizeof buf))
+ /* If error reading memory, guess that it is not a delayed
+ branch. */
return 0;
- return is_delayed ((unsigned long)
- extract_unsigned_integer (buf, MIPS_INSTLEN));
-}
-
-/* Skip the PC past function prologue instructions (32-bit version).
- This is a helper function for mips_skip_prologue. */
-
-static CORE_ADDR
-mips32_skip_prologue (CORE_ADDR pc)
-{
- t_inst inst;
- CORE_ADDR end_pc;
- int seen_sp_adjust = 0;
- int load_immediate_bytes = 0;
-
- /* Find an upper bound on the prologue. */
- end_pc = skip_prologue_using_sal (pc);
- if (end_pc == 0)
- end_pc = pc + 100; /* Magic. */
-
- /* Skip the typical prologue instructions. These are the stack adjustment
- instruction and the instructions that save registers on the stack
- or in the gcc frame. */
- for (; pc < end_pc; pc += MIPS_INSTLEN)
- {
- unsigned long high_word;
-
- inst = mips_fetch_instruction (pc);
- high_word = (inst >> 16) & 0xffff;
-
- if (high_word == 0x27bd /* addiu $sp,$sp,offset */
- || high_word == 0x67bd) /* daddiu $sp,$sp,offset */
- seen_sp_adjust = 1;
- else if (inst == 0x03a1e823 || /* subu $sp,$sp,$at */
- inst == 0x03a8e823) /* subu $sp,$sp,$t0 */
- seen_sp_adjust = 1;
- else if (((inst & 0xFFE00000) == 0xAFA00000 /* sw reg,n($sp) */
- || (inst & 0xFFE00000) == 0xFFA00000) /* sd reg,n($sp) */
- && (inst & 0x001F0000)) /* reg != $zero */
- continue;
-
- else if ((inst & 0xFFE00000) == 0xE7A00000) /* swc1 freg,n($sp) */
- continue;
- else if ((inst & 0xF3E00000) == 0xA3C00000 && (inst & 0x001F0000))
- /* sx reg,n($s8) */
- continue; /* reg != $zero */
-
- /* move $s8,$sp. With different versions of gas this will be either
- `addu $s8,$sp,$zero' or `or $s8,$sp,$zero' or `daddu s8,sp,$0'.
- Accept any one of these. */
- else if (inst == 0x03A0F021 || inst == 0x03a0f025 || inst == 0x03a0f02d)
- continue;
-
- else if ((inst & 0xFF9F07FF) == 0x00800021) /* move reg,$a0-$a3 */
- continue;
- else if (high_word == 0x3c1c) /* lui $gp,n */
- continue;
- else if (high_word == 0x279c) /* addiu $gp,$gp,n */
- continue;
- else if (inst == 0x0399e021 /* addu $gp,$gp,$t9 */
- || inst == 0x033ce021) /* addu $gp,$t9,$gp */
- continue;
- /* The following instructions load $at or $t0 with an immediate
- value in preparation for a stack adjustment via
- subu $sp,$sp,[$at,$t0]. These instructions could also initialize
- a local variable, so we accept them only before a stack adjustment
- instruction was seen. */
- else if (!seen_sp_adjust)
- {
- if (high_word == 0x3c01 || /* lui $at,n */
- high_word == 0x3c08) /* lui $t0,n */
- {
- load_immediate_bytes += MIPS_INSTLEN; /* FIXME!! */
- continue;
- }
- else if (high_word == 0x3421 || /* ori $at,$at,n */
- high_word == 0x3508 || /* ori $t0,$t0,n */
- high_word == 0x3401 || /* ori $at,$zero,n */
- high_word == 0x3408) /* ori $t0,$zero,n */
- {
- load_immediate_bytes += MIPS_INSTLEN; /* FIXME!! */
- continue;
- }
- else
- break;
- }
- else
- break;
- }
-
- /* In a frameless function, we might have incorrectly
- skipped some load immediate instructions. Undo the skipping
- if the load immediate was not followed by a stack adjustment. */
- if (load_immediate_bytes && !seen_sp_adjust)
- pc -= load_immediate_bytes;
- return pc;
-}
-
-/* Skip the PC past function prologue instructions (16-bit version).
- This is a helper function for mips_skip_prologue. */
-
-static CORE_ADDR
-mips16_skip_prologue (CORE_ADDR pc)
-{
- CORE_ADDR end_pc;
- int extend_bytes = 0;
- int prev_extend_bytes;
-
- /* Table of instructions likely to be found in a function prologue. */
- static struct
- {
- unsigned short inst;
- unsigned short mask;
- }
- table[] =
- {
- {
- 0x6300, 0xff00}
- , /* addiu $sp,offset */
- {
- 0xfb00, 0xff00}
- , /* daddiu $sp,offset */
- {
- 0xd000, 0xf800}
- , /* sw reg,n($sp) */
- {
- 0xf900, 0xff00}
- , /* sd reg,n($sp) */
- {
- 0x6200, 0xff00}
- , /* sw $ra,n($sp) */
- {
- 0xfa00, 0xff00}
- , /* sd $ra,n($sp) */
- {
- 0x673d, 0xffff}
- , /* move $s1,sp */
- {
- 0xd980, 0xff80}
- , /* sw $a0-$a3,n($s1) */
- {
- 0x6704, 0xff1c}
- , /* move reg,$a0-$a3 */
- {
- 0xe809, 0xf81f}
- , /* entry pseudo-op */
- {
- 0x0100, 0xff00}
- , /* addiu $s1,$sp,n */
- {
- 0, 0} /* end of table marker */
- };
-
- /* Find an upper bound on the prologue. */
- end_pc = skip_prologue_using_sal (pc);
- if (end_pc == 0)
- end_pc = pc + 100; /* Magic. */
-
- /* Skip the typical prologue instructions. These are the stack adjustment
- instruction and the instructions that save registers on the stack
- or in the gcc frame. */
- for (; pc < end_pc; pc += MIPS16_INSTLEN)
- {
- unsigned short inst;
- int i;
-
- inst = mips_fetch_instruction (pc);
-
- /* Normally we ignore an extend instruction. However, if it is
- not followed by a valid prologue instruction, we must adjust
- the pc back over the extend so that it won't be considered
- part of the prologue. */
- if ((inst & 0xf800) == 0xf000) /* extend */
- {
- extend_bytes = MIPS16_INSTLEN;
- continue;
- }
- prev_extend_bytes = extend_bytes;
- extend_bytes = 0;
-
- /* Check for other valid prologue instructions besides extend. */
- for (i = 0; table[i].mask != 0; i++)
- if ((inst & table[i].mask) == table[i].inst) /* found, get out */
- break;
- if (table[i].mask != 0) /* it was in table? */
- continue; /* ignore it */
- else
- /* non-prologue */
- {
- /* Return the current pc, adjusted backwards by 2 if
- the previous instruction was an extend. */
- return pc - prev_extend_bytes;
- }
- }
- return pc;
+ return is_delayed (extract_unsigned_integer (buf, sizeof buf));
}
/* To skip prologues, I use this predicate. Returns either PC itself
static CORE_ADDR
mips_skip_prologue (CORE_ADDR pc)
{
+ CORE_ADDR limit_pc;
+ CORE_ADDR func_addr;
+
/* See if we can determine the end of the prologue via the symbol table.
If so, then return either PC, or the PC after the prologue, whichever
is greater. */
-
- CORE_ADDR post_prologue_pc = after_prologue (pc, NULL);
-
- if (post_prologue_pc != 0)
- return max (pc, post_prologue_pc);
+ if (find_pc_partial_function (pc, NULL, &func_addr, NULL))
+ {
+ CORE_ADDR post_prologue_pc = skip_prologue_using_sal (func_addr);
+ if (post_prologue_pc != 0)
+ return max (pc, post_prologue_pc);
+ }
/* Can't determine prologue from the symbol table, need to examine
instructions. */
- if (pc_is_mips16 (pc))
- return mips16_skip_prologue (pc);
+ /* Find an upper limit on the function prologue using the debug
+ information. If the debug information could not be used to provide
+ that bound, then use an arbitrary large number as the upper bound. */
+ limit_pc = skip_prologue_using_sal (pc);
+ if (limit_pc == 0)
+ limit_pc = pc + 100; /* Magic. */
+
+ if (mips_pc_is_mips16 (pc))
+ return mips16_scan_prologue (pc, limit_pc, NULL, NULL);
else
- return mips32_skip_prologue (pc);
+ return mips32_scan_prologue (pc, limit_pc, NULL, NULL);
}
/* Root of all "set mips "/"show mips " commands. This will eventually be
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
CORE_ADDR prid;
- prid = read_register (PRID_REGNUM);
+ prid = read_register (MIPS_PRID_REGNUM);
if ((prid & ~0xf) == 0x700)
tdep->mips_processor_reg_names = mips_r3041_reg_names;
gdb_print_insn_mips (bfd_vma memaddr, struct disassemble_info *info)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
- mips_extra_func_info_t proc_desc;
-
- /* Search for the function containing this address. Set the low bit
- of the address when searching, in case we were given an even address
- that is the start of a 16-bit function. If we didn't do this,
- the search would fail because the symbol table says the function
- starts at an odd address, i.e. 1 byte past the given address. */
- memaddr = ADDR_BITS_REMOVE (memaddr);
- proc_desc = non_heuristic_proc_desc (make_mips16_addr (memaddr), NULL);
-
- /* Make an attempt to determine if this is a 16-bit function. If
- the procedure descriptor exists and the address therein is odd,
- it's definitely a 16-bit function. Otherwise, we have to just
- guess that if the address passed in is odd, it's 16-bits. */
+
/* FIXME: cagney/2003-06-26: Is this even necessary? The
disassembler needs to be able to locally determine the ISA, and
not rely on GDB. Otherwize the stand-alone 'objdump -d' will not
work. */
- if (proc_desc)
- {
- if (pc_is_mips16 (PROC_LOW_ADDR (proc_desc)))
- info->mach = bfd_mach_mips16;
- }
- else
- {
- if (pc_is_mips16 (memaddr))
- info->mach = bfd_mach_mips16;
- }
+ if (mips_pc_is_mips16 (memaddr))
+ info->mach = bfd_mach_mips16;
/* Round down the instruction address to the appropriate boundary. */
memaddr &= (info->mach == bfd_mach_mips16 ? ~1 : ~3);
{
if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
{
- if (pc_is_mips16 (*pcptr))
+ if (mips_pc_is_mips16 (*pcptr))
{
static unsigned char mips16_big_breakpoint[] = { 0xe8, 0xa5 };
*pcptr = unmake_mips16_addr (*pcptr);
}
else
{
- if (pc_is_mips16 (*pcptr))
+ if (mips_pc_is_mips16 (*pcptr))
{
static unsigned char mips16_little_breakpoint[] = { 0xa5, 0xe8 };
*pcptr = unmake_mips16_addr (*pcptr);
a return stub and the target PC is in $18.
See the source code for the stubs in gcc/config/mips/mips16.S for
- gory details.
-
- This function implements the SKIP_TRAMPOLINE_CODE macro.
- */
+ gory details. */
static CORE_ADDR
-mips_skip_stub (CORE_ADDR pc)
+mips_skip_trampoline_code (CORE_ADDR pc)
{
char *name;
CORE_ADDR start_addr;
target PC is in $31 ($ra). */
if (strcmp (name, "__mips16_ret_sf") == 0
|| strcmp (name, "__mips16_ret_df") == 0)
- return read_signed_register (RA_REGNUM);
+ return read_signed_register (MIPS_RA_REGNUM);
if (strncmp (name, "__mips16_call_stub_", 19) == 0)
{
address from those two instructions. */
CORE_ADDR target_pc = read_signed_register (2);
- t_inst inst;
+ ULONGEST inst;
int i;
/* See if the name of the target function is __fn_stub_*. */
/* Scan through this _fn_stub_ code for the lui/addiu pair.
The limit on the search is arbitrarily set to 20
instructions. FIXME. */
- for (i = 0, pc = 0; i < 20; i++, target_pc += MIPS_INSTLEN)
+ for (i = 0, pc = 0; i < 20; i++, target_pc += MIPS_INSN32_SIZE)
{
inst = mips_fetch_instruction (target_pc);
if ((inst & 0xffff0000) == 0x3c010000) /* lui $at */
return 0; /* not a stub */
}
-
-/* Return non-zero if the PC is inside a call thunk (aka stub or trampoline).
- This implements the IN_SOLIB_CALL_TRAMPOLINE macro. */
-
-static int
-mips_in_call_stub (CORE_ADDR pc, char *name)
-{
- CORE_ADDR start_addr;
-
- /* Find the starting address of the function containing the PC. If the
- caller didn't give us a name, look it up at the same time. */
- if (find_pc_partial_function (pc, name ? NULL : &name, &start_addr, NULL) ==
- 0)
- return 0;
-
- if (strncmp (name, "__mips16_call_stub_", 19) == 0)
- {
- /* If the PC is in __mips16_call_stub_{1..10}, this is a call stub. */
- if (name[19] >= '0' && name[19] <= '9')
- return 1;
- /* If the PC at the start of __mips16_call_stub_{s,d}f_{0..10}, i.e.
- before the jal instruction, this is effectively a call stub. */
- else if (name[19] == 's' || name[19] == 'd')
- return pc == start_addr;
- }
-
- return 0; /* not a stub */
-}
-
-
-/* Return non-zero if the PC is inside a return thunk (aka stub or trampoline).
- This implements the IN_SOLIB_RETURN_TRAMPOLINE macro. */
-
-static int
-mips_in_return_stub (CORE_ADDR pc, char *name)
-{
- CORE_ADDR start_addr;
-
- /* Find the starting address of the function containing the PC. */
- if (find_pc_partial_function (pc, NULL, &start_addr, NULL) == 0)
- return 0;
-
- /* If the PC is in __mips16_ret_{d,s}f, this is a return stub. */
- if (strcmp (name, "__mips16_ret_sf") == 0
- || strcmp (name, "__mips16_ret_df") == 0)
- return 1;
-
- /* If the PC is in __mips16_call_stub_{s,d}f_{0..10} but not at the start,
- i.e. after the jal instruction, this is effectively a return stub. */
- if (strncmp (name, "__mips16_call_stub_", 19) == 0
- && (name[19] == 's' || name[19] == 'd') && pc != start_addr)
- return 1;
-
- return 0; /* not a stub */
-}
-
-
-/* Return non-zero if the PC is in a library helper function that should
- be ignored. This implements the IGNORE_HELPER_CALL macro. */
-
-int
-mips_ignore_helper (CORE_ADDR pc)
-{
- char *name;
-
- /* Find the starting address and name of the function containing the PC. */
- if (find_pc_partial_function (pc, &name, NULL, NULL) == 0)
- return 0;
-
- /* If the PC is in __mips16_ret_{d,s}f, this is a library helper function
- that we want to ignore. */
- return (strcmp (name, "__mips16_ret_sf") == 0
- || strcmp (name, "__mips16_ret_df") == 0);
-}
-
-
/* Convert a dbx stab register number (from `r' declaration) to a GDB
[1 * NUM_REGS .. 2 * NUM_REGS) REGNUM. */
}
/* FIXME: cagney/2003-11-15: For MIPS, hasn't PC_REGNUM been
replaced by read_pc? */
- set_gdbarch_pc_regnum (gdbarch, regnum->pc);
+ set_gdbarch_pc_regnum (gdbarch, regnum->pc + num_regs);
+ set_gdbarch_sp_regnum (gdbarch, MIPS_SP_REGNUM + num_regs);
set_gdbarch_fp0_regnum (gdbarch, regnum->fp0);
set_gdbarch_num_regs (gdbarch, num_regs);
set_gdbarch_num_pseudo_regs (gdbarch, num_regs);
case MIPS_ABI_O32:
set_gdbarch_push_dummy_call (gdbarch, mips_o32_push_dummy_call);
set_gdbarch_return_value (gdbarch, mips_o32_return_value);
- tdep->mips_last_arg_regnum = A0_REGNUM + 4 - 1;
+ tdep->mips_last_arg_regnum = MIPS_A0_REGNUM + 4 - 1;
tdep->mips_last_fp_arg_regnum = tdep->regnum->fp0 + 12 + 4 - 1;
tdep->default_mask_address_p = 0;
set_gdbarch_long_bit (gdbarch, 32);
break;
case MIPS_ABI_O64:
set_gdbarch_push_dummy_call (gdbarch, mips_o64_push_dummy_call);
- set_gdbarch_deprecated_store_return_value (gdbarch,
- mips_o64_store_return_value);
- set_gdbarch_deprecated_extract_return_value (gdbarch,
- mips_o64_extract_return_value);
- tdep->mips_last_arg_regnum = A0_REGNUM + 4 - 1;
+ set_gdbarch_return_value (gdbarch, mips_o64_return_value);
+ tdep->mips_last_arg_regnum = MIPS_A0_REGNUM + 4 - 1;
tdep->mips_last_fp_arg_regnum = tdep->regnum->fp0 + 12 + 4 - 1;
tdep->default_mask_address_p = 0;
set_gdbarch_long_bit (gdbarch, 32);
set_gdbarch_ptr_bit (gdbarch, 32);
set_gdbarch_long_long_bit (gdbarch, 64);
- set_gdbarch_use_struct_convention (gdbarch,
- always_use_struct_convention);
break;
case MIPS_ABI_EABI32:
set_gdbarch_push_dummy_call (gdbarch, mips_eabi_push_dummy_call);
- set_gdbarch_deprecated_store_return_value (gdbarch,
- mips_eabi_store_return_value);
- set_gdbarch_deprecated_extract_return_value (gdbarch,
- mips_eabi_extract_return_value);
- tdep->mips_last_arg_regnum = A0_REGNUM + 8 - 1;
+ set_gdbarch_return_value (gdbarch, mips_eabi_return_value);
+ tdep->mips_last_arg_regnum = MIPS_A0_REGNUM + 8 - 1;
tdep->mips_last_fp_arg_regnum = tdep->regnum->fp0 + 12 + 8 - 1;
tdep->default_mask_address_p = 0;
set_gdbarch_long_bit (gdbarch, 32);
set_gdbarch_ptr_bit (gdbarch, 32);
set_gdbarch_long_long_bit (gdbarch, 64);
- set_gdbarch_deprecated_reg_struct_has_addr
- (gdbarch, mips_eabi_reg_struct_has_addr);
- set_gdbarch_use_struct_convention (gdbarch,
- mips_eabi_use_struct_convention);
break;
case MIPS_ABI_EABI64:
set_gdbarch_push_dummy_call (gdbarch, mips_eabi_push_dummy_call);
- set_gdbarch_deprecated_store_return_value (gdbarch,
- mips_eabi_store_return_value);
- set_gdbarch_deprecated_extract_return_value (gdbarch,
- mips_eabi_extract_return_value);
- tdep->mips_last_arg_regnum = A0_REGNUM + 8 - 1;
+ set_gdbarch_return_value (gdbarch, mips_eabi_return_value);
+ tdep->mips_last_arg_regnum = MIPS_A0_REGNUM + 8 - 1;
tdep->mips_last_fp_arg_regnum = tdep->regnum->fp0 + 12 + 8 - 1;
tdep->default_mask_address_p = 0;
set_gdbarch_long_bit (gdbarch, 64);
set_gdbarch_ptr_bit (gdbarch, 64);
set_gdbarch_long_long_bit (gdbarch, 64);
- set_gdbarch_deprecated_reg_struct_has_addr
- (gdbarch, mips_eabi_reg_struct_has_addr);
- set_gdbarch_use_struct_convention (gdbarch,
- mips_eabi_use_struct_convention);
break;
case MIPS_ABI_N32:
set_gdbarch_push_dummy_call (gdbarch, mips_n32n64_push_dummy_call);
set_gdbarch_return_value (gdbarch, mips_n32n64_return_value);
- tdep->mips_last_arg_regnum = A0_REGNUM + 8 - 1;
+ tdep->mips_last_arg_regnum = MIPS_A0_REGNUM + 8 - 1;
tdep->mips_last_fp_arg_regnum = tdep->regnum->fp0 + 12 + 8 - 1;
tdep->default_mask_address_p = 0;
set_gdbarch_long_bit (gdbarch, 32);
set_gdbarch_ptr_bit (gdbarch, 32);
set_gdbarch_long_long_bit (gdbarch, 64);
+ set_gdbarch_long_double_bit (gdbarch, 128);
+ set_gdbarch_long_double_format (gdbarch,
+ &floatformat_n32n64_long_double_big);
break;
case MIPS_ABI_N64:
set_gdbarch_push_dummy_call (gdbarch, mips_n32n64_push_dummy_call);
set_gdbarch_return_value (gdbarch, mips_n32n64_return_value);
- tdep->mips_last_arg_regnum = A0_REGNUM + 8 - 1;
+ tdep->mips_last_arg_regnum = MIPS_A0_REGNUM + 8 - 1;
tdep->mips_last_fp_arg_regnum = tdep->regnum->fp0 + 12 + 8 - 1;
tdep->default_mask_address_p = 0;
set_gdbarch_long_bit (gdbarch, 64);
set_gdbarch_ptr_bit (gdbarch, 64);
set_gdbarch_long_long_bit (gdbarch, 64);
+ set_gdbarch_long_double_bit (gdbarch, 128);
+ set_gdbarch_long_double_format (gdbarch,
+ &floatformat_n32n64_long_double_big);
break;
default:
internal_error (__FILE__, __LINE__, "unknown ABI in switch");
is sitting on? */
set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1);
- set_gdbarch_skip_trampoline_code (gdbarch, mips_skip_stub);
+ set_gdbarch_skip_trampoline_code (gdbarch, mips_skip_trampoline_code);
- /* NOTE drow/2004-02-11: We overload the core solib trampoline code
- to support MIPS16. This is a bad thing. Make sure not to do it
- if we have an OS ABI that actually supports shared libraries, since
- shared library support is more important. If we have an OS someday
- that supports both shared libraries and MIPS16, we'll have to find
- a better place for these. */
- if (info.osabi == GDB_OSABI_UNKNOWN)
- {
- set_gdbarch_in_solib_call_trampoline (gdbarch, mips_in_call_stub);
- set_gdbarch_in_solib_return_trampoline (gdbarch, mips_in_return_stub);
- }
+ set_gdbarch_single_step_through_delay (gdbarch, mips_single_step_through_delay);
/* Hook in OS ABI-specific overrides, if they have been registered. */
gdbarch_init_osabi (info, gdbarch);
/* Unwind the frame. */
- frame_unwind_append_sniffer (gdbarch, mips_mdebug_frame_sniffer);
- frame_base_append_sniffer (gdbarch, mips_mdebug_frame_base_sniffer);
+ frame_unwind_append_sniffer (gdbarch, mips_stub_frame_sniffer);
+ frame_unwind_append_sniffer (gdbarch, mips_insn16_frame_sniffer);
+ frame_unwind_append_sniffer (gdbarch, mips_insn32_frame_sniffer);
+ frame_base_append_sniffer (gdbarch, mips_stub_frame_base_sniffer);
+ frame_base_append_sniffer (gdbarch, mips_insn16_frame_base_sniffer);
+ frame_base_append_sniffer (gdbarch, mips_insn32_frame_base_sniffer);
return gdbarch;
}
fprintf_unfiltered (file,
"mips_dump_tdep: mips_stack_argsize() = %d\n",
mips_stack_argsize (current_gdbarch));
- fprintf_unfiltered (file, "mips_dump_tdep: A0_REGNUM = %d\n", A0_REGNUM);
- fprintf_unfiltered (file,
- "mips_dump_tdep: ADDR_BITS_REMOVE # %s\n",
- XSTRING (ADDR_BITS_REMOVE (ADDR)));
- fprintf_unfiltered (file,
- "mips_dump_tdep: ATTACH_DETACH # %s\n",
- XSTRING (ATTACH_DETACH));
- fprintf_unfiltered (file,
- "mips_dump_tdep: DWARF_REG_TO_REGNUM # %s\n",
- XSTRING (DWARF_REG_TO_REGNUM (REGNUM)));
- fprintf_unfiltered (file,
- "mips_dump_tdep: ECOFF_REG_TO_REGNUM # %s\n",
- XSTRING (ECOFF_REG_TO_REGNUM (REGNUM)));
- fprintf_unfiltered (file,
- "mips_dump_tdep: FIRST_EMBED_REGNUM = %d\n",
- FIRST_EMBED_REGNUM);
- fprintf_unfiltered (file,
- "mips_dump_tdep: IGNORE_HELPER_CALL # %s\n",
- XSTRING (IGNORE_HELPER_CALL (PC)));
- fprintf_unfiltered (file,
- "mips_dump_tdep: IN_SOLIB_CALL_TRAMPOLINE # %s\n",
- XSTRING (IN_SOLIB_CALL_TRAMPOLINE (PC, NAME)));
- fprintf_unfiltered (file,
- "mips_dump_tdep: IN_SOLIB_RETURN_TRAMPOLINE # %s\n",
- XSTRING (IN_SOLIB_RETURN_TRAMPOLINE (PC, NAME)));
- fprintf_unfiltered (file,
- "mips_dump_tdep: LAST_EMBED_REGNUM = %d\n",
- LAST_EMBED_REGNUM);
-#ifdef MACHINE_CPROC_FP_OFFSET
- fprintf_unfiltered (file,
- "mips_dump_tdep: MACHINE_CPROC_FP_OFFSET = %d\n",
- MACHINE_CPROC_FP_OFFSET);
-#endif
-#ifdef MACHINE_CPROC_PC_OFFSET
- fprintf_unfiltered (file,
- "mips_dump_tdep: MACHINE_CPROC_PC_OFFSET = %d\n",
- MACHINE_CPROC_PC_OFFSET);
-#endif
-#ifdef MACHINE_CPROC_SP_OFFSET
- fprintf_unfiltered (file,
- "mips_dump_tdep: MACHINE_CPROC_SP_OFFSET = %d\n",
- MACHINE_CPROC_SP_OFFSET);
-#endif
- fprintf_unfiltered (file,
- "mips_dump_tdep: MIPS16_INSTLEN = %d\n",
- MIPS16_INSTLEN);
- fprintf_unfiltered (file, "mips_dump_tdep: MIPS_DEFAULT_ABI = FIXME!\n");
- fprintf_unfiltered (file,
- "mips_dump_tdep: MIPS_EFI_SYMBOL_NAME = multi-arch!!\n");
- fprintf_unfiltered (file,
- "mips_dump_tdep: MIPS_INSTLEN = %d\n", MIPS_INSTLEN);
- fprintf_unfiltered (file,
- "mips_dump_tdep: MIPS_LAST_ARG_REGNUM = %d (%d regs)\n",
- MIPS_LAST_ARG_REGNUM,
- MIPS_LAST_ARG_REGNUM - A0_REGNUM + 1);
- fprintf_unfiltered (file,
- "mips_dump_tdep: MIPS_NUMREGS = %d\n", MIPS_NUMREGS);
- fprintf_unfiltered (file,
- "mips_dump_tdep: mips_abi_regsize() = %d\n",
- mips_abi_regsize (current_gdbarch));
- fprintf_unfiltered (file,
- "mips_dump_tdep: PRID_REGNUM = %d\n", PRID_REGNUM);
- fprintf_unfiltered (file,
- "mips_dump_tdep: PROC_DESC_IS_DUMMY = function?\n");
- fprintf_unfiltered (file,
- "mips_dump_tdep: PROC_FRAME_ADJUST = function?\n");
- fprintf_unfiltered (file,
- "mips_dump_tdep: PROC_FRAME_OFFSET = function?\n");
- fprintf_unfiltered (file, "mips_dump_tdep: PROC_FRAME_REG = function?\n");
- fprintf_unfiltered (file, "mips_dump_tdep: PROC_FREG_MASK = function?\n");
- fprintf_unfiltered (file, "mips_dump_tdep: PROC_FREG_OFFSET = function?\n");
- fprintf_unfiltered (file, "mips_dump_tdep: PROC_HIGH_ADDR = function?\n");
- fprintf_unfiltered (file, "mips_dump_tdep: PROC_LOW_ADDR = function?\n");
- fprintf_unfiltered (file, "mips_dump_tdep: PROC_PC_REG = function?\n");
- fprintf_unfiltered (file, "mips_dump_tdep: PROC_REG_MASK = function?\n");
- fprintf_unfiltered (file, "mips_dump_tdep: PROC_REG_OFFSET = function?\n");
- fprintf_unfiltered (file, "mips_dump_tdep: PROC_SYMBOL = function?\n");
- fprintf_unfiltered (file, "mips_dump_tdep: PS_REGNUM = %d\n", PS_REGNUM);
- fprintf_unfiltered (file, "mips_dump_tdep: RA_REGNUM = %d\n", RA_REGNUM);
-#ifdef SAVED_BYTES
- fprintf_unfiltered (file,
- "mips_dump_tdep: SAVED_BYTES = %d\n", SAVED_BYTES);
-#endif
-#ifdef SAVED_FP
- fprintf_unfiltered (file, "mips_dump_tdep: SAVED_FP = %d\n", SAVED_FP);
-#endif
-#ifdef SAVED_PC
- fprintf_unfiltered (file, "mips_dump_tdep: SAVED_PC = %d\n", SAVED_PC);
-#endif
- fprintf_unfiltered (file,
- "mips_dump_tdep: SETUP_ARBITRARY_FRAME # %s\n",
- XSTRING (SETUP_ARBITRARY_FRAME (NUMARGS, ARGS)));
- fprintf_unfiltered (file,
- "mips_dump_tdep: SET_PROC_DESC_IS_DUMMY = function?\n");
- fprintf_unfiltered (file,
- "mips_dump_tdep: SKIP_TRAMPOLINE_CODE # %s\n",
- XSTRING (SKIP_TRAMPOLINE_CODE (PC)));
- fprintf_unfiltered (file,
- "mips_dump_tdep: SOFTWARE_SINGLE_STEP # %s\n",
- XSTRING (SOFTWARE_SINGLE_STEP (SIG, BP_P)));
- fprintf_unfiltered (file,
- "mips_dump_tdep: SOFTWARE_SINGLE_STEP_P () = %d\n",
- SOFTWARE_SINGLE_STEP_P ());
- fprintf_unfiltered (file,
- "mips_dump_tdep: STAB_REG_TO_REGNUM # %s\n",
- XSTRING (STAB_REG_TO_REGNUM (REGNUM)));
-#ifdef STACK_END_ADDR
- fprintf_unfiltered (file,
- "mips_dump_tdep: STACK_END_ADDR = %d\n",
- STACK_END_ADDR);
-#endif
- fprintf_unfiltered (file,
- "mips_dump_tdep: STEP_SKIPS_DELAY # %s\n",
- XSTRING (STEP_SKIPS_DELAY (PC)));
- fprintf_unfiltered (file,
- "mips_dump_tdep: STEP_SKIPS_DELAY_P = %d\n",
- STEP_SKIPS_DELAY_P);
- fprintf_unfiltered (file,
- "mips_dump_tdep: STOPPED_BY_WATCHPOINT # %s\n",
- XSTRING (STOPPED_BY_WATCHPOINT (WS)));
- fprintf_unfiltered (file, "mips_dump_tdep: T9_REGNUM = %d\n", T9_REGNUM);
- fprintf_unfiltered (file,
- "mips_dump_tdep: TABULAR_REGISTER_OUTPUT = used?\n");
- fprintf_unfiltered (file,
- "mips_dump_tdep: TARGET_CAN_USE_HARDWARE_WATCHPOINT # %s\n",
- XSTRING (TARGET_CAN_USE_HARDWARE_WATCHPOINT
- (TYPE, CNT, OTHERTYPE)));
- fprintf_unfiltered (file,
- "mips_dump_tdep: TARGET_HAS_HARDWARE_WATCHPOINTS # %s\n",
- XSTRING (TARGET_HAS_HARDWARE_WATCHPOINTS));
-#ifdef TRACE_CLEAR
- fprintf_unfiltered (file,
- "mips_dump_tdep: TRACE_CLEAR # %s\n",
- XSTRING (TRACE_CLEAR (THREAD, STATE)));
-#endif
-#ifdef TRACE_FLAVOR
- fprintf_unfiltered (file,
- "mips_dump_tdep: TRACE_FLAVOR = %d\n", TRACE_FLAVOR);
-#endif
-#ifdef TRACE_FLAVOR_SIZE
- fprintf_unfiltered (file,
- "mips_dump_tdep: TRACE_FLAVOR_SIZE = %d\n",
- TRACE_FLAVOR_SIZE);
-#endif
-#ifdef TRACE_SET
- fprintf_unfiltered (file,
- "mips_dump_tdep: TRACE_SET # %s\n",
- XSTRING (TRACE_SET (X, STATE)));
-#endif
-#ifdef UNUSED_REGNUM
- fprintf_unfiltered (file,
- "mips_dump_tdep: UNUSED_REGNUM = %d\n", UNUSED_REGNUM);
-#endif
- fprintf_unfiltered (file, "mips_dump_tdep: V0_REGNUM = %d\n", V0_REGNUM);
- fprintf_unfiltered (file,
- "mips_dump_tdep: VM_MIN_ADDRESS = %ld\n",
- (long) VM_MIN_ADDRESS);
- fprintf_unfiltered (file,
- "mips_dump_tdep: ZERO_REGNUM = %d\n", ZERO_REGNUM);
- fprintf_unfiltered (file,
- "mips_dump_tdep: _PROC_MAGIC_ = %d\n", _PROC_MAGIC_);
}
extern initialize_file_ftype _initialize_mips_tdep; /* -Wmissing-prototypes */
&showmipscmdlist, "show mips ", 0, &showlist);
/* Allow the user to override the saved register size. */
- add_show_from_set (add_set_enum_cmd ("saved-gpreg-size",
- class_obscure,
- size_enums,
- &mips_abi_regsize_string, "\
-Set size of general purpose registers saved on the stack.\n\
+ add_setshow_enum_cmd ("saved-gpreg-size", class_obscure,
+ size_enums, &mips_abi_regsize_string, "\
+Set size of general purpose registers saved on the stack.\n", "\
+Show size of general purpose registers saved on the stack.\n", "\
This option can be set to one of:\n\
32 - Force GDB to treat saved GP registers as 32-bit\n\
64 - Force GDB to treat saved GP registers as 64-bit\n\
auto - Allow GDB to use the target's default setting or autodetect the\n\
saved GP register size from information contained in the executable.\n\
- (default: auto)", &setmipscmdlist), &showmipscmdlist);
+ (default: auto)", "\
+Size of general purpose registers saved on the stack is %s.\n",
+ NULL, NULL, &setmipscmdlist, &showmipscmdlist,
+ NULL, NULL);
/* Allow the user to override the argument stack size. */
- add_show_from_set (add_set_enum_cmd ("stack-arg-size",
- class_obscure,
- size_enums,
- &mips_stack_argsize_string, "\
-Set the amount of stack space reserved for each argument.\n\
+ add_setshow_enum_cmd ("stack-arg-size", class_obscure,
+ size_enums, &mips_stack_argsize_string, "\
+Set the amount of stack space reserved for each argument.\n", "\
+Show the amount of stack space reserved for each argument.\n", "\
This option can be set to one of:\n\
32 - Force GDB to allocate 32-bit chunks per argument\n\
64 - Force GDB to allocate 64-bit chunks per argument\n\
auto - Allow GDB to determine the correct setting from the current\n\
- target and executable (default)", &setmipscmdlist), &showmipscmdlist);
+ target and executable (default)", "\
+The amount of stack space reserved for each argument is %s.\n",
+ NULL, NULL, &setmipscmdlist, &showmipscmdlist,
+ NULL, NULL);
/* Allow the user to override the ABI. */
c = add_set_enum_cmd
/* We really would like to have both "0" and "unlimited" work, but
command.c doesn't deal with that. So make it a var_zinteger
because the user can always use "999999" or some such for unlimited. */
- c = add_set_cmd ("heuristic-fence-post", class_support, var_zinteger,
- (char *) &heuristic_fence_post, "\
-Set the distance searched for the start of a function.\n\
+ add_setshow_zinteger_cmd ("heuristic-fence-post", class_support,
+ &heuristic_fence_post, "\
+Set the distance searched for the start of a function.\n", "\
+Show the distance searched for the start of a function.\n", "\
If you are debugging a stripped executable, GDB needs to search through the\n\
program for the start of a function. This command sets the distance of the\n\
-search. The only need to set it is when debugging a stripped executable.", &setlist);
- /* We need to throw away the frame cache when we set this, since it
- might change our ability to get backtraces. */
- set_cmd_sfunc (c, reinit_frame_cache_sfunc);
- add_show_from_set (c, &showlist);
+search. The only need to set it is when debugging a stripped executable.", "\
+The distance searched for the start of a function is %s.\n",
+ reinit_frame_cache_sfunc, NULL,
+ &setlist, &showlist);
/* Allow the user to control whether the upper bits of 64-bit
addresses should be zeroed. */
add_setshow_auto_boolean_cmd ("mask-address", no_class, &mask_address_var, "\
-Set zeroing of upper 32 bits of 64-bit addresses.\n\
+Set zeroing of upper 32 bits of 64-bit addresses.", "\
+Show zeroing of upper 32 bits of 64-bit addresses.", "\
Use \"on\" to enable the masking, \"off\" to disable it and \"auto\" to \n\
allow GDB to determine the correct value.\n", "\
-Show zeroing of upper 32 bits of 64-bit addresses.",
+Zerroing of upper 32 bits of 64-bit address is %s.",
NULL, show_mask_address, &setmipscmdlist, &showmipscmdlist);
/* Allow the user to control the size of 32 bit registers within the
raw remote packet. */
- add_setshow_cmd ("remote-mips64-transfers-32bit-regs", class_obscure,
- var_boolean, &mips64_transfers_32bit_regs_p, "\
-Set compatibility with 64-bit MIPS targets that transfer 32-bit quantities.\n\
+ add_setshow_boolean_cmd ("remote-mips64-transfers-32bit-regs", class_obscure,
+ &mips64_transfers_32bit_regs_p, "\
+Set compatibility with 64-bit MIPS target that transfers 32-bit quantities.", "\
+Show compatibility with 64-bit MIPS target that transfers 32-bit quantities.", "\
Use \"on\" to enable backward compatibility with older MIPS 64 GDB+target\n\
that would transfer 32 bits for some registers (e.g. SR, FSR) and\n\
64 bits for others. Use \"off\" to disable compatibility mode", "\
-Show compatibility with 64-bit MIPS targets that transfer 32-bit quantities.\n\
-Use \"on\" to enable backward compatibility with older MIPS 64 GDB+target\n\
-that would transfer 32 bits for some registers (e.g. SR, FSR) and\n\
-64 bits for others. Use \"off\" to disable compatibility mode", set_mips64_transfers_32bit_regs, NULL, &setlist, &showlist);
+Compatibility with 64-bit MIPS target that transfers 32-bit quantities is %s.",
+ set_mips64_transfers_32bit_regs, NULL, &setlist, &showlist);
/* Debug this files internals. */
- add_show_from_set (add_set_cmd ("mips", class_maintenance, var_zinteger,
- &mips_debug, "Set mips debugging.\n\
-When non-zero, mips specific debugging is enabled.", &setdebuglist), &showdebuglist);
+ add_setshow_zinteger_cmd ("mips", class_maintenance,
+ &mips_debug, "\
+Set mips debugging.\n", "\
+Show mips debugging.\n", "\
+When non-zero, mips specific debugging is enabled.\n", "\
+Mips debugging is currently %s.\n",
+ NULL, NULL,
+ &setdebuglist, &showdebuglist);
}
projects / deliverable / binutils-gdb.git / blobdiff