#include "value.h"
#include "arch-utils.h"
#include "osabi.h"
+#include "frame-unwind.h"
+#include "frame-base.h"
+#include "trad-frame.h"
#include "arm-tdep.h"
#include "gdb/sim-arm.h"
static void convert_to_extended (const struct floatformat *, void *,
const void *);
-/* Define other aspects of the stack frame. We keep the offsets of
- all saved registers, 'cause we need 'em a lot! We also keep the
- current size of the stack frame, and the offset of the frame
- pointer from the stack pointer (for frameless functions, and when
- we're still in the prologue of a function with a frame). */
-
-struct frame_extra_info
+struct arm_prologue_cache
{
+ /* The stack pointer at the time this frame was created; i.e. the
+ caller's stack pointer when this function was called. It is used
+ to identify this frame. */
+ CORE_ADDR prev_sp;
+
+ /* The frame base for this frame is just prev_sp + frame offset -
+ frame size. FRAMESIZE is the size of this stack frame, and
+ FRAMEOFFSET if the initial offset from the stack pointer (this
+ frame's stack pointer, not PREV_SP) to the frame base. */
+
int framesize;
int frameoffset;
+
+ /* The register used to hold the frame pointer for this frame. */
int framereg;
+
+ /* Saved register offsets. */
+ struct trad_frame_saved_reg *saved_regs;
};
/* Addresses for calling Thumb functions have the bit 0 set.
#define MAKE_THUMB_ADDR(addr) ((addr) | 1)
#define UNMAKE_THUMB_ADDR(addr) ((addr) & ~1)
-static int
-arm_frame_chain_valid (CORE_ADDR chain, struct frame_info *thisframe)
-{
- return (DEPRECATED_FRAME_SAVED_PC (thisframe) >= LOWEST_PC);
-}
-
/* Set to true if the 32-bit mode is in use. */
int arm_apcs_32 = 1;
if (inst == 0xe1a0c00d) /* mov ip, sp */
continue;
+ if ((inst & 0xfffff000) == 0xe28dc000) /* add ip, sp #n */
+ continue;
+
+ if ((inst & 0xfffff000) == 0xe24dc000) /* sub ip, sp #n */
+ continue;
+
/* Some prologues begin with "str lr, [sp, #-4]!". */
if (inst == 0xe52de004) /* str lr, [sp, #-4]! */
continue;
2) which registers are saved on it
3) the offsets of saved regs
4) the offset from the stack pointer to the frame pointer
- This information is stored in the "extra" fields of the frame_info.
A typical Thumb function prologue would create this stack frame
(offsets relative to FP)
/* *INDENT-ON* */
static void
-thumb_scan_prologue (struct frame_info *fi)
+thumb_scan_prologue (CORE_ADDR prev_pc, struct arm_prologue_cache *cache)
{
CORE_ADDR prologue_start;
CORE_ADDR prologue_end;
int findmask = 0;
int i;
- /* Don't try to scan dummy frames. */
- if (fi != NULL
- && DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), 0, 0))
- return;
-
- if (find_pc_partial_function (get_frame_pc (fi), NULL, &prologue_start, &prologue_end))
+ if (find_pc_partial_function (prev_pc, NULL, &prologue_start, &prologue_end))
{
struct symtab_and_line sal = find_pc_line (prologue_start, 0);
if (sal.line == 0) /* no line info, use current PC */
- prologue_end = get_frame_pc (fi);
+ prologue_end = prev_pc;
else if (sal.end < prologue_end) /* next line begins after fn end */
prologue_end = sal.end; /* (probably means no prologue) */
}
16 pushes, an add, and "mv fp,sp". */
prologue_end = prologue_start + 40;
- prologue_end = min (prologue_end, get_frame_pc (fi));
+ prologue_end = min (prologue_end, prev_pc);
/* Initialize the saved register map. When register H is copied to
register L, we will put H in saved_reg[L]. */
frame pointer, adjust the stack pointer, and save registers.
Do this until all basic prolog instructions are found. */
- get_frame_extra_info (fi)->framesize = 0;
+ cache->framesize = 0;
for (current_pc = prologue_start;
(current_pc < prologue_end) && ((findmask & 7) != 7);
current_pc += 2)
for (regno = ARM_LR_REGNUM; regno >= 0; regno--)
if (mask & (1 << regno))
{
- get_frame_extra_info (fi)->framesize += 4;
- get_frame_saved_regs (fi)[saved_reg[regno]] =
- -(get_frame_extra_info (fi)->framesize);
+ cache->framesize += 4;
+ cache->saved_regs[saved_reg[regno]].addr = -cache->framesize;
/* Reset saved register map. */
saved_reg[regno] = regno;
}
offset = (insn & 0x7f) << 2; /* get scaled offset */
if (insn & 0x80) /* is it signed? (==subtracting) */
{
- get_frame_extra_info (fi)->frameoffset += offset;
+ cache->frameoffset += offset;
offset = -offset;
}
- get_frame_extra_info (fi)->framesize -= offset;
+ cache->framesize -= offset;
}
else if ((insn & 0xff00) == 0xaf00) /* add r7, sp, #imm */
{
findmask |= 2; /* setting of r7 found */
- get_frame_extra_info (fi)->framereg = THUMB_FP_REGNUM;
+ cache->framereg = THUMB_FP_REGNUM;
/* get scaled offset */
- get_frame_extra_info (fi)->frameoffset = (insn & 0xff) << 2;
+ cache->frameoffset = (insn & 0xff) << 2;
}
else if (insn == 0x466f) /* mov r7, sp */
{
findmask |= 2; /* setting of r7 found */
- get_frame_extra_info (fi)->framereg = THUMB_FP_REGNUM;
- get_frame_extra_info (fi)->frameoffset = 0;
+ cache->framereg = THUMB_FP_REGNUM;
+ cache->frameoffset = 0;
saved_reg[THUMB_FP_REGNUM] = ARM_SP_REGNUM;
}
else if ((insn & 0xffc0) == 0x4640) /* mov r0-r7, r8-r15 */
*/
static void
-arm_scan_prologue (struct frame_info *fi)
+arm_scan_prologue (struct frame_info *next_frame, struct arm_prologue_cache *cache)
{
- int regno, sp_offset, fp_offset;
- LONGEST return_value;
+ int regno, sp_offset, fp_offset, ip_offset;
CORE_ADDR prologue_start, prologue_end, current_pc;
+ CORE_ADDR prev_pc = frame_pc_unwind (next_frame);
/* Assume there is no frame until proven otherwise. */
- get_frame_extra_info (fi)->framereg = ARM_SP_REGNUM;
- get_frame_extra_info (fi)->framesize = 0;
- get_frame_extra_info (fi)->frameoffset = 0;
+ cache->framereg = ARM_SP_REGNUM;
+ cache->framesize = 0;
+ cache->frameoffset = 0;
/* Check for Thumb prologue. */
- if (arm_pc_is_thumb (get_frame_pc (fi)))
+ if (arm_pc_is_thumb (prev_pc))
{
- thumb_scan_prologue (fi);
+ thumb_scan_prologue (prev_pc, cache);
return;
}
/* Find the function prologue. If we can't find the function in
the symbol table, peek in the stack frame to find the PC. */
- if (find_pc_partial_function (get_frame_pc (fi), NULL, &prologue_start, &prologue_end))
+ if (find_pc_partial_function (prev_pc, NULL, &prologue_start, &prologue_end))
{
/* One way to find the end of the prologue (which works well
for unoptimized code) is to do the following:
struct symtab_and_line sal = find_pc_line (prologue_start, 0);
if (sal.line == 0)
- prologue_end = get_frame_pc (fi);
+ prologue_end = prev_pc;
else if (sal.end < prologue_end)
prologue_end = sal.end;
}
else
{
- /* Get address of the stmfd in the prologue of the callee;
- the saved PC is the address of the stmfd + 8. */
- if (!safe_read_memory_integer (get_frame_base (fi), 4, &return_value))
+ /* We have no symbol information. Our only option is to assume this
+ function has a standard stack frame and the normal frame register.
+ Then, we can find the value of our frame pointer on entrance to
+ the callee (or at the present moment if this is the innermost frame).
+ The value stored there should be the address of the stmfd + 8. */
+ CORE_ADDR frame_loc;
+ LONGEST return_value;
+
+ frame_loc = frame_unwind_register_unsigned (next_frame, ARM_FP_REGNUM);
+ if (!safe_read_memory_integer (frame_loc, 4, &return_value))
return;
else
{
}
}
+ if (prev_pc < prologue_end)
+ prologue_end = prev_pc;
+
/* Now search the prologue looking for instructions that set up the
frame pointer, adjust the stack pointer, and save registers.
in which case it is often (but not always) replaced by
"str lr, [sp, #-4]!". - Michael Snyder, 2002-04-23] */
- sp_offset = fp_offset = 0;
+ sp_offset = fp_offset = ip_offset = 0;
for (current_pc = prologue_start;
current_pc < prologue_end;
if (insn == 0xe1a0c00d) /* mov ip, sp */
{
+ ip_offset = 0;
+ continue;
+ }
+ else if ((insn & 0xfffff000) == 0xe28dc000) /* add ip, sp #n */
+ {
+ unsigned imm = insn & 0xff; /* immediate value */
+ unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */
+ imm = (imm >> rot) | (imm << (32 - rot));
+ ip_offset = imm;
+ continue;
+ }
+ else if ((insn & 0xfffff000) == 0xe24dc000) /* sub ip, sp #n */
+ {
+ unsigned imm = insn & 0xff; /* immediate value */
+ unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */
+ imm = (imm >> rot) | (imm << (32 - rot));
+ ip_offset = -imm;
continue;
}
else if (insn == 0xe52de004) /* str lr, [sp, #-4]! */
{
- /* Function is frameless: extra_info defaults OK? */
+ sp_offset -= 4;
+ cache->saved_regs[ARM_LR_REGNUM].addr = sp_offset;
continue;
}
else if ((insn & 0xffff0000) == 0xe92d0000)
if (mask & (1 << regno))
{
sp_offset -= 4;
- get_frame_saved_regs (fi)[regno] = sp_offset;
+ cache->saved_regs[regno].addr = sp_offset;
}
}
else if ((insn & 0xffffc000) == 0xe54b0000 || /* strb rx,[r11,#-n] */
unsigned imm = insn & 0xff; /* immediate value */
unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */
imm = (imm >> rot) | (imm << (32 - rot));
- fp_offset = -imm;
- get_frame_extra_info (fi)->framereg = ARM_FP_REGNUM;
+ fp_offset = -imm + ip_offset;
+ cache->framereg = ARM_FP_REGNUM;
}
else if ((insn & 0xfffff000) == 0xe24dd000) /* sub sp, sp #n */
{
{
sp_offset -= 12;
regno = ARM_F0_REGNUM + ((insn >> 12) & 0x07);
- get_frame_saved_regs (fi)[regno] = sp_offset;
+ cache->saved_regs[regno].addr = sp_offset;
}
else if ((insn & 0xffbf0fff) == 0xec2d0200) /* sfmfd f0, 4, [sp!] */
{
for (; fp_start_reg < fp_bound_reg; fp_start_reg++)
{
sp_offset -= 12;
- get_frame_saved_regs (fi)[fp_start_reg++] = sp_offset;
+ cache->saved_regs[fp_start_reg++].addr = sp_offset;
}
}
else if ((insn & 0xf0000000) != 0xe0000000)
/* The frame size is just the negative of the offset (from the
original SP) of the last thing thing we pushed on the stack.
The frame offset is [new FP] - [new SP]. */
- get_frame_extra_info (fi)->framesize = -sp_offset;
- if (get_frame_extra_info (fi)->framereg == ARM_FP_REGNUM)
- get_frame_extra_info (fi)->frameoffset = fp_offset - sp_offset;
+ cache->framesize = -sp_offset;
+ if (cache->framereg == ARM_FP_REGNUM)
+ cache->frameoffset = fp_offset - sp_offset;
else
- get_frame_extra_info (fi)->frameoffset = 0;
+ cache->frameoffset = 0;
}
-/* Find REGNUM on the stack. Otherwise, it's in an active register.
- One thing we might want to do here is to check REGNUM against the
- clobber mask, and somehow flag it as invalid if it isn't saved on
- the stack somewhere. This would provide a graceful failure mode
- when trying to get the value of caller-saves registers for an inner
- frame. */
-
-static CORE_ADDR
-arm_find_callers_reg (struct frame_info *fi, int regnum)
+static struct arm_prologue_cache *
+arm_make_prologue_cache (struct frame_info *next_frame)
{
- /* NOTE: cagney/2002-05-03: This function really shouldn't be
- needed. Instead the (still being written) register unwind
- function could be called directly. */
- for (; fi; fi = get_next_frame (fi))
- {
- if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), 0, 0))
- {
- return deprecated_read_register_dummy (get_frame_pc (fi),
- get_frame_base (fi), regnum);
- }
- else if (get_frame_saved_regs (fi)[regnum] != 0)
- {
- /* NOTE: cagney/2002-05-03: This would normally need to
- handle ARM_SP_REGNUM as a special case as, according to
- the frame.h comments, saved_regs[SP_REGNUM] contains the
- SP value not its address. It appears that the ARM isn't
- doing this though. */
- return read_memory_integer (get_frame_saved_regs (fi)[regnum],
- REGISTER_RAW_SIZE (regnum));
- }
- }
- return read_register (regnum);
+ int reg;
+ struct arm_prologue_cache *cache;
+ CORE_ADDR unwound_fp;
+
+ cache = frame_obstack_zalloc (sizeof (struct arm_prologue_cache));
+ cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+
+ arm_scan_prologue (next_frame, cache);
+
+ unwound_fp = frame_unwind_register_unsigned (next_frame, cache->framereg);
+ if (unwound_fp == 0)
+ return cache;
+
+ cache->prev_sp = unwound_fp + cache->framesize - cache->frameoffset;
+
+ /* Calculate actual addresses of saved registers using offsets
+ determined by arm_scan_prologue. */
+ for (reg = 0; reg < NUM_REGS; reg++)
+ if (trad_frame_addr_p (cache->saved_regs, reg))
+ cache->saved_regs[reg].addr += cache->prev_sp;
+
+ return cache;
}
-/* Function: frame_chain Given a GDB frame, determine the address of
- the calling function's frame. This will be used to create a new
- GDB frame struct, and then DEPRECATED_INIT_EXTRA_FRAME_INFO and
- DEPRECATED_INIT_FRAME_PC will be called for the new frame. For
- ARM, we save the frame size when we initialize the frame_info. */
-static CORE_ADDR
-arm_frame_chain (struct frame_info *fi)
+/* Our frame ID for a normal frame is the current function's starting PC
+ and the caller's SP when we were called. */
+
+static void
+arm_prologue_this_id (struct frame_info *next_frame,
+ void **this_cache,
+ struct frame_id *this_id)
{
- CORE_ADDR caller_pc;
- int framereg = get_frame_extra_info (fi)->framereg;
+ struct arm_prologue_cache *cache;
+ struct frame_id id;
+ CORE_ADDR func;
- if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), 0, 0))
- /* A generic call dummy's frame is the same as caller's. */
- return get_frame_base (fi);
+ if (*this_cache == NULL)
+ *this_cache = arm_make_prologue_cache (next_frame);
+ cache = *this_cache;
- if (get_frame_pc (fi) < LOWEST_PC)
- return 0;
+ func = frame_func_unwind (next_frame);
+
+ /* This is meant to halt the backtrace at "_start". Make sure we
+ don't halt it at a generic dummy frame. */
+ if (func <= LOWEST_PC || deprecated_inside_entry_file (func))
+ return;
+
+ /* If we've hit a wall, stop. */
+ if (cache->prev_sp == 0)
+ return;
+
+ id = frame_id_build (cache->prev_sp, func);
- /* If the caller is the startup code, we're at the end of the chain. */
- caller_pc = DEPRECATED_FRAME_SAVED_PC (fi);
+ /* Check that we're not going round in circles with the same frame
+ ID (but avoid applying the test to sentinel frames which do go
+ round in circles). */
+ if (frame_relative_level (next_frame) >= 0
+ && get_frame_type (next_frame) == NORMAL_FRAME
+ && frame_id_eq (get_frame_id (next_frame), id))
+ return;
+
+ *this_id = id;
+}
- /* If the caller is Thumb and the caller is ARM, or vice versa,
- the frame register of the caller is different from ours.
- So we must scan the prologue of the caller to determine its
- frame register number. */
- /* XXX Fixme, we should try to do this without creating a temporary
- caller_fi. */
- if (arm_pc_is_thumb (caller_pc) != arm_pc_is_thumb (get_frame_pc (fi)))
+static void
+arm_prologue_prev_register (struct frame_info *next_frame,
+ void **this_cache,
+ int prev_regnum,
+ int *optimized,
+ enum lval_type *lvalp,
+ CORE_ADDR *addrp,
+ int *realnump,
+ void *valuep)
+{
+ struct arm_prologue_cache *cache;
+
+ if (*this_cache == NULL)
+ *this_cache = arm_make_prologue_cache (next_frame);
+ cache = *this_cache;
+
+ /* If we are asked to unwind the PC, then we need to return the LR
+ instead. The saved value of PC points into this frame's
+ prologue, not the next frame's resume location. */
+ if (prev_regnum == ARM_PC_REGNUM)
+ prev_regnum = ARM_LR_REGNUM;
+
+ /* SP is generally not saved to the stack, but this frame is
+ identified by NEXT_FRAME's stack pointer at the time of the call.
+ The value was already reconstructed into PREV_SP. */
+ if (prev_regnum == ARM_SP_REGNUM)
{
- struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
- struct frame_info *caller_fi =
- deprecated_frame_xmalloc_with_cleanup (SIZEOF_FRAME_SAVED_REGS,
- sizeof (struct frame_extra_info));
-
- /* Now, scan the prologue and obtain the frame register. */
- deprecated_update_frame_pc_hack (caller_fi, caller_pc);
- arm_scan_prologue (caller_fi);
- framereg = get_frame_extra_info (caller_fi)->framereg;
-
- /* Deallocate the storage associated with the temporary frame
- created above. */
- do_cleanups (old_chain);
+ *lvalp = not_lval;
+ if (valuep)
+ store_unsigned_integer (valuep, 4, cache->prev_sp);
+ return;
}
- /* If the caller used a frame register, return its value.
- Otherwise, return the caller's stack pointer. */
- if (framereg == ARM_FP_REGNUM || framereg == THUMB_FP_REGNUM)
- return arm_find_callers_reg (fi, framereg);
- else
- return get_frame_base (fi) + get_frame_extra_info (fi)->framesize;
+ trad_frame_prev_register (next_frame, cache->saved_regs, prev_regnum,
+ optimized, lvalp, addrp, realnump, valuep);
}
-/* This function actually figures out the frame address for a given pc
- and sp. This is tricky because we sometimes don't use an explicit
- frame pointer, and the previous stack pointer isn't necessarily
- recorded on the stack. The only reliable way to get this info is
- to examine the prologue. FROMLEAF is a little confusing, it means
- this is the next frame up the chain AFTER a frameless function. If
- this is true, then the frame value for this frame is still in the
- fp register. */
+struct frame_unwind arm_prologue_unwind = {
+ NORMAL_FRAME,
+ arm_prologue_this_id,
+ arm_prologue_prev_register
+};
-static void
-arm_init_extra_frame_info (int fromleaf, struct frame_info *fi)
+static const struct frame_unwind *
+arm_prologue_unwind_sniffer (struct frame_info *next_frame)
{
- int reg;
- CORE_ADDR sp;
+ return &arm_prologue_unwind;
+}
- if (get_frame_saved_regs (fi) == NULL)
- frame_saved_regs_zalloc (fi);
+static CORE_ADDR
+arm_normal_frame_base (struct frame_info *next_frame, void **this_cache)
+{
+ struct arm_prologue_cache *cache;
- frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info));
+ if (*this_cache == NULL)
+ *this_cache = arm_make_prologue_cache (next_frame);
+ cache = *this_cache;
- get_frame_extra_info (fi)->framesize = 0;
- get_frame_extra_info (fi)->frameoffset = 0;
- get_frame_extra_info (fi)->framereg = 0;
+ return cache->prev_sp + cache->frameoffset - cache->framesize;
+}
- if (get_next_frame (fi))
- deprecated_update_frame_pc_hack (fi, DEPRECATED_FRAME_SAVED_PC (get_next_frame (fi)));
+struct frame_base arm_normal_base = {
+ &arm_prologue_unwind,
+ arm_normal_frame_base,
+ arm_normal_frame_base,
+ arm_normal_frame_base
+};
- memset (get_frame_saved_regs (fi), '\000', sizeof get_frame_saved_regs (fi));
+static struct arm_prologue_cache *
+arm_make_sigtramp_cache (struct frame_info *next_frame)
+{
+ struct arm_prologue_cache *cache;
+ int reg;
- /* Compute stack pointer for this frame. We use this value for both
- the sigtramp and call dummy cases. */
- if (!get_next_frame (fi))
- sp = read_sp();
- else if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (get_next_frame (fi)), 0, 0))
- /* For generic dummy frames, pull the value direct from the frame.
- Having an unwind function to do this would be nice. */
- sp = deprecated_read_register_dummy (get_frame_pc (get_next_frame (fi)),
- get_frame_base (get_next_frame (fi)),
- ARM_SP_REGNUM);
- else
- sp = (get_frame_base (get_next_frame (fi))
- - get_frame_extra_info (get_next_frame (fi))->frameoffset
- + get_frame_extra_info (get_next_frame (fi))->framesize);
-
- /* Determine whether or not we're in a sigtramp frame.
- Unfortunately, it isn't sufficient to test (get_frame_type (fi)
- == SIGTRAMP_FRAME) because this value is sometimes set after
- invoking DEPRECATED_INIT_EXTRA_FRAME_INFO. So we test *both*
- (get_frame_type (fi) == SIGTRAMP_FRAME) and PC_IN_SIGTRAMP to
- determine if we need to use the sigcontext addresses for the
- saved registers.
-
- Note: If an ARM PC_IN_SIGTRAMP method ever needs to compare
- against the name of the function, the code below will have to be
- changed to first fetch the name of the function and then pass
- this name to PC_IN_SIGTRAMP. */
+ cache = frame_obstack_zalloc (sizeof (struct arm_prologue_cache));
- /* FIXME: cagney/2002-11-18: This problem will go away once
- frame.c:get_prev_frame() is modified to set the frame's type
- before calling functions like this. */
+ cache->prev_sp = frame_unwind_register_unsigned (next_frame, ARM_SP_REGNUM);
- if (SIGCONTEXT_REGISTER_ADDRESS_P ()
- && ((get_frame_type (fi) == SIGTRAMP_FRAME) || PC_IN_SIGTRAMP (get_frame_pc (fi), (char *)0)))
- {
- for (reg = 0; reg < NUM_REGS; reg++)
- get_frame_saved_regs (fi)[reg] = SIGCONTEXT_REGISTER_ADDRESS (sp, get_frame_pc (fi), reg);
+ cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
- /* FIXME: What about thumb mode? */
- get_frame_extra_info (fi)->framereg = ARM_SP_REGNUM;
- deprecated_update_frame_base_hack (fi, read_memory_integer (get_frame_saved_regs (fi)[get_frame_extra_info (fi)->framereg], REGISTER_RAW_SIZE (get_frame_extra_info (fi)->framereg)));
- get_frame_extra_info (fi)->framesize = 0;
- get_frame_extra_info (fi)->frameoffset = 0;
+ for (reg = 0; reg < NUM_REGS; reg++)
+ cache->saved_regs[reg].addr
+ = SIGCONTEXT_REGISTER_ADDRESS (cache->prev_sp,
+ frame_pc_unwind (next_frame), reg);
- }
- else
- {
- arm_scan_prologue (fi);
-
- if (!get_next_frame (fi))
- /* This is the innermost frame? */
- deprecated_update_frame_base_hack (fi, read_register (get_frame_extra_info (fi)->framereg));
- else if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (get_next_frame (fi)), 0, 0))
- /* Next inner most frame is a dummy, just grab its frame.
- Dummy frames always have the same FP as their caller. */
- deprecated_update_frame_base_hack (fi, get_frame_base (get_next_frame (fi)));
- else if (get_frame_extra_info (fi)->framereg == ARM_FP_REGNUM
- || get_frame_extra_info (fi)->framereg == THUMB_FP_REGNUM)
- {
- /* not the innermost frame */
- /* If we have an FP, the callee saved it. */
- if (get_frame_saved_regs (get_next_frame (fi))[get_frame_extra_info (fi)->framereg] != 0)
- deprecated_update_frame_base_hack (fi, read_memory_integer (get_frame_saved_regs (get_next_frame (fi))[get_frame_extra_info (fi)->framereg], 4));
- else if (fromleaf)
- /* If we were called by a frameless fn. then our frame is
- still in the frame pointer register on the board... */
- deprecated_update_frame_base_hack (fi, deprecated_read_fp ());
- }
+ /* FIXME: What about thumb mode? */
+ cache->framereg = ARM_SP_REGNUM;
+ cache->prev_sp
+ = read_memory_integer (cache->saved_regs[cache->framereg].addr,
+ DEPRECATED_REGISTER_RAW_SIZE (cache->framereg));
- /* Calculate actual addresses of saved registers using offsets
- determined by arm_scan_prologue. */
- for (reg = 0; reg < NUM_REGS; reg++)
- if (get_frame_saved_regs (fi)[reg] != 0)
- get_frame_saved_regs (fi)[reg]
- += (get_frame_base (fi)
- + get_frame_extra_info (fi)->framesize
- - get_frame_extra_info (fi)->frameoffset);
- }
+ return cache;
}
+static void
+arm_sigtramp_this_id (struct frame_info *next_frame,
+ void **this_cache,
+ struct frame_id *this_id)
+{
+ struct arm_prologue_cache *cache;
-/* Find the caller of this frame. We do this by seeing if ARM_LR_REGNUM
- is saved in the stack anywhere, otherwise we get it from the
- registers.
+ if (*this_cache == NULL)
+ *this_cache = arm_make_sigtramp_cache (next_frame);
+ cache = *this_cache;
- The old definition of this function was a macro:
- #define FRAME_SAVED_PC(FRAME) \
- ADDR_BITS_REMOVE (read_memory_integer ((FRAME)->frame - 4, 4)) */
+ /* FIXME drow/2003-07-07: This isn't right if we single-step within
+ the sigtramp frame; the PC should be the beginning of the trampoline. */
+ *this_id = frame_id_build (cache->prev_sp, frame_pc_unwind (next_frame));
+}
-static CORE_ADDR
-arm_frame_saved_pc (struct frame_info *fi)
+static void
+arm_sigtramp_prev_register (struct frame_info *next_frame,
+ void **this_cache,
+ int prev_regnum,
+ int *optimized,
+ enum lval_type *lvalp,
+ CORE_ADDR *addrp,
+ int *realnump,
+ void *valuep)
{
- /* If a dummy frame, pull the PC out of the frame's register buffer. */
- if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), 0, 0))
- return deprecated_read_register_dummy (get_frame_pc (fi),
- get_frame_base (fi), ARM_PC_REGNUM);
+ struct arm_prologue_cache *cache;
- if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi),
- (get_frame_base (fi)
- - get_frame_extra_info (fi)->frameoffset),
- get_frame_base (fi)))
- {
- return read_memory_integer (get_frame_saved_regs (fi)[ARM_PC_REGNUM],
- REGISTER_RAW_SIZE (ARM_PC_REGNUM));
- }
- else
- {
- CORE_ADDR pc = arm_find_callers_reg (fi, ARM_LR_REGNUM);
- return IS_THUMB_ADDR (pc) ? UNMAKE_THUMB_ADDR (pc) : pc;
- }
+ if (*this_cache == NULL)
+ *this_cache = arm_make_sigtramp_cache (next_frame);
+ cache = *this_cache;
+
+ trad_frame_prev_register (next_frame, cache->saved_regs, prev_regnum,
+ optimized, lvalp, addrp, realnump, valuep);
}
-/* Return the frame address. On ARM, it is R11; on Thumb it is R7.
- Examine the Program Status Register to decide which state we're in. */
+struct frame_unwind arm_sigtramp_unwind = {
+ SIGTRAMP_FRAME,
+ arm_sigtramp_this_id,
+ arm_sigtramp_prev_register
+};
-static CORE_ADDR
-arm_read_fp (void)
+static const struct frame_unwind *
+arm_sigtramp_unwind_sniffer (struct frame_info *next_frame)
{
- if (read_register (ARM_PS_REGNUM) & 0x20) /* Bit 5 is Thumb state bit */
- return read_register (THUMB_FP_REGNUM); /* R7 if Thumb */
- else
- return read_register (ARM_FP_REGNUM); /* R11 if ARM */
+ /* Note: If an ARM PC_IN_SIGTRAMP method ever needs to compare
+ against the name of the function, the code below will have to be
+ changed to first fetch the name of the function and then pass
+ this name to PC_IN_SIGTRAMP. */
+
+ if (SIGCONTEXT_REGISTER_ADDRESS_P ()
+ && PC_IN_SIGTRAMP (frame_pc_unwind (next_frame), (char *) 0))
+ return &arm_sigtramp_unwind;
+
+ return NULL;
}
-/* Store into a struct frame_saved_regs the addresses of the saved
- registers of frame described by FRAME_INFO. This includes special
- registers such as PC and FP saved in special ways in the stack
- frame. SP is even more special: the address we return for it IS
- the sp for the next frame. */
+/* Assuming NEXT_FRAME->prev is a dummy, return the frame ID of that
+ dummy frame. The frame ID's base needs to match the TOS value
+ saved by save_dummy_frame_tos() and returned from
+ arm_push_dummy_call, and the PC needs to match the dummy frame's
+ breakpoint. */
-static void
-arm_frame_init_saved_regs (struct frame_info *fip)
+static struct frame_id
+arm_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
+ return frame_id_build (frame_unwind_register_unsigned (next_frame, ARM_SP_REGNUM),
+ frame_pc_unwind (next_frame));
+}
- if (get_frame_saved_regs (fip))
- return;
+/* Given THIS_FRAME, find the previous frame's resume PC (which will
+ be used to construct the previous frame's ID, after looking up the
+ containing function). */
- arm_init_extra_frame_info (0, fip);
+static CORE_ADDR
+arm_unwind_pc (struct gdbarch *gdbarch, struct frame_info *this_frame)
+{
+ CORE_ADDR pc;
+ pc = frame_unwind_register_unsigned (this_frame, ARM_PC_REGNUM);
+ return IS_THUMB_ADDR (pc) ? UNMAKE_THUMB_ADDR (pc) : pc;
+}
+
+static CORE_ADDR
+arm_unwind_sp (struct gdbarch *gdbarch, struct frame_info *this_frame)
+{
+ return frame_unwind_register_unsigned (this_frame, ARM_SP_REGNUM);
}
/* Set the return address for a generic dummy frame. ARM uses the
static CORE_ADDR
arm_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
{
- write_register (ARM_LR_REGNUM, CALL_DUMMY_ADDRESS ());
+ write_register (ARM_LR_REGNUM, entry_point_address ());
return sp;
}
write_register (4, fun);
}
-/* Pop the current frame. So long as the frame info has been
- initialized properly (see arm_init_extra_frame_info), this code
- works for dummy frames as well as regular frames. I.e, there's no
- need to have a special case for dummy frames. */
-static void
-arm_pop_frame (void)
-{
- int regnum;
- struct frame_info *frame = get_current_frame ();
- CORE_ADDR old_SP = (get_frame_base (frame)
- - get_frame_extra_info (frame)->frameoffset
- + get_frame_extra_info (frame)->framesize);
-
- if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame),
- get_frame_base (frame),
- get_frame_base (frame)))
- {
- generic_pop_dummy_frame ();
- flush_cached_frames ();
- return;
- }
-
- for (regnum = 0; regnum < NUM_REGS; regnum++)
- if (get_frame_saved_regs (frame)[regnum] != 0)
- write_register (regnum,
- read_memory_integer (get_frame_saved_regs (frame)[regnum],
- REGISTER_RAW_SIZE (regnum)));
-
- write_register (ARM_PC_REGNUM, DEPRECATED_FRAME_SAVED_PC (frame));
- write_register (ARM_SP_REGNUM, old_SP);
-
- flush_cached_frames ();
-}
-
/* When arguments must be pushed onto the stack, they go on in reverse
order. The code below implements a FILO (stack) to do this. */
arm_print_float_info (struct gdbarch *gdbarch, struct ui_file *file,
struct frame_info *frame, const char *args)
{
- register unsigned long status = read_register (ARM_FPS_REGNUM);
+ unsigned long status = read_register (ARM_FPS_REGNUM);
int type;
type = (status >> 24) & 127;
arm_use_struct_convention (int gcc_p, struct type *type)
{
int nRc;
- register enum type_code code;
+ enum type_code code;
/* In the ARM ABI, "integer" like aggregate types are returned in
registers. For an aggregate type to be integer like, its size
tdep = xmalloc (sizeof (struct gdbarch_tdep));
gdbarch = gdbarch_alloc (&info, tdep);
- /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
- ready to unwind the PC first (see frame.c:get_prev_frame()). */
- set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default);
-
/* We used to default to FPA for generic ARM, but almost nobody uses that
now, and we now provide a way for the user to force the model. So
default to the most useful variant. */
set_gdbarch_push_dummy_call (gdbarch, arm_push_dummy_call);
/* Frame handling. */
- set_gdbarch_deprecated_frame_chain_valid (gdbarch, arm_frame_chain_valid);
- set_gdbarch_deprecated_init_extra_frame_info (gdbarch, arm_init_extra_frame_info);
- set_gdbarch_deprecated_target_read_fp (gdbarch, arm_read_fp);
- set_gdbarch_deprecated_frame_chain (gdbarch, arm_frame_chain);
+ set_gdbarch_unwind_dummy_id (gdbarch, arm_unwind_dummy_id);
+ set_gdbarch_unwind_pc (gdbarch, arm_unwind_pc);
+ set_gdbarch_unwind_sp (gdbarch, arm_unwind_sp);
+
set_gdbarch_frameless_function_invocation
(gdbarch, arm_frameless_function_invocation);
- set_gdbarch_deprecated_frame_saved_pc (gdbarch, arm_frame_saved_pc);
set_gdbarch_frame_args_skip (gdbarch, 0);
- set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, arm_frame_init_saved_regs);
- set_gdbarch_deprecated_pop_frame (gdbarch, arm_pop_frame);
+
+ frame_base_set_default (gdbarch, &arm_normal_base);
/* Address manipulation. */
set_gdbarch_smash_text_address (gdbarch, arm_smash_text_address);
/* Hook in the ABI-specific overrides, if they have been registered. */
gdbarch_init_osabi (info, gdbarch);
+ /* Add some default predicates. */
+ frame_unwind_append_sniffer (gdbarch, arm_sigtramp_unwind_sniffer);
+ frame_unwind_append_sniffer (gdbarch, arm_prologue_unwind_sniffer);
+
/* Now we have tuned the configuration, set a few final things,
based on what the OS ABI has told us. */
projects / deliverable / binutils-gdb.git / blobdiff