/* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
- Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software
- Foundation, Inc.
+ Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+ 2007, 2008 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "arch-utils.h"
+#include "dis-asm.h"
+#include "gdbtypes.h"
+#include "regcache.h"
+#include "gdb_string.h"
+#include "gdb_assert.h"
+#include "gdbcore.h" /* for write_memory_unsigned_integer */
+#include "value.h"
+#include "gdbtypes.h"
#include "frame.h"
-#include "inferior.h"
+#include "frame-unwind.h"
+#include "frame-base.h"
+#include "trad-frame.h"
+#include "symtab.h"
+#include "dwarf2-frame.h"
+#include "osabi.h"
+#include "infcall.h"
#include "target.h"
-#include "value.h"
-#include "bfd.h"
-#include "gdb_string.h"
-#include "gdbcore.h"
-#include "symfile.h"
-#include "regcache.h"
-#include "arch-utils.h"
-#define D0_REGNUM 0
-#define D2_REGNUM 2
-#define D3_REGNUM 3
-#define A0_REGNUM 4
-#define A2_REGNUM 6
-#define A3_REGNUM 7
-#define MDR_REGNUM 10
-#define PSW_REGNUM 11
-#define LIR_REGNUM 12
-#define LAR_REGNUM 13
-#define MDRQ_REGNUM 14
-#define E0_REGNUM 15
-#define MCRH_REGNUM 26
-#define MCRL_REGNUM 27
-#define MCVF_REGNUM 28
-
-enum movm_register_bits {
- movm_exother_bit = 0x01,
- movm_exreg1_bit = 0x02,
- movm_exreg0_bit = 0x04,
- movm_other_bit = 0x08,
- movm_a3_bit = 0x10,
- movm_a2_bit = 0x20,
- movm_d3_bit = 0x40,
- movm_d2_bit = 0x80
-};
+#include "mn10300-tdep.h"
-extern void _initialize_mn10300_tdep (void);
-static CORE_ADDR mn10300_analyze_prologue (struct frame_info *fi,
- CORE_ADDR pc);
+/* Forward decl. */
+extern struct trad_frame_cache *mn10300_frame_unwind_cache (struct frame_info*,
+ void **);
-/* mn10300 private data */
-struct gdbarch_tdep
+/* Compute the alignment required by a type. */
+
+static int
+mn10300_type_align (struct type *type)
{
- int am33_mode;
-#define AM33_MODE (gdbarch_tdep (current_gdbarch)->am33_mode)
-};
+ int i, align = 1;
-/* Additional info used by the frame */
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_INT:
+ case TYPE_CODE_ENUM:
+ case TYPE_CODE_SET:
+ case TYPE_CODE_RANGE:
+ case TYPE_CODE_CHAR:
+ case TYPE_CODE_BOOL:
+ case TYPE_CODE_FLT:
+ case TYPE_CODE_PTR:
+ case TYPE_CODE_REF:
+ return TYPE_LENGTH (type);
+
+ case TYPE_CODE_COMPLEX:
+ return TYPE_LENGTH (type) / 2;
+
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ for (i = 0; i < TYPE_NFIELDS (type); i++)
+ {
+ int falign = mn10300_type_align (TYPE_FIELD_TYPE (type, i));
+ while (align < falign)
+ align <<= 1;
+ }
+ return align;
-struct frame_extra_info
- {
- int status;
- int stack_size;
- };
+ case TYPE_CODE_ARRAY:
+ /* HACK! Structures containing arrays, even small ones, are not
+ elligible for returning in registers. */
+ return 256;
+
+ case TYPE_CODE_TYPEDEF:
+ return mn10300_type_align (check_typedef (type));
+
+ default:
+ internal_error (__FILE__, __LINE__, _("bad switch"));
+ }
+}
+
+/* Should call_function allocate stack space for a struct return? */
+static int
+mn10300_use_struct_convention (struct type *type)
+{
+ /* Structures bigger than a pair of words can't be returned in
+ registers. */
+ if (TYPE_LENGTH (type) > 8)
+ return 1;
+
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ /* Structures with a single field are handled as the field
+ itself. */
+ if (TYPE_NFIELDS (type) == 1)
+ return mn10300_use_struct_convention (TYPE_FIELD_TYPE (type, 0));
+
+ /* Structures with word or double-word size are passed in memory, as
+ long as they require at least word alignment. */
+ if (mn10300_type_align (type) >= 4)
+ return 0;
+
+ return 1;
+
+ /* Arrays are addressable, so they're never returned in
+ registers. This condition can only hold when the array is
+ the only field of a struct or union. */
+ case TYPE_CODE_ARRAY:
+ return 1;
+
+ case TYPE_CODE_TYPEDEF:
+ return mn10300_use_struct_convention (check_typedef (type));
+
+ default:
+ return 0;
+ }
+}
+
+static void
+mn10300_store_return_value (struct gdbarch *gdbarch, struct type *type,
+ struct regcache *regcache, const void *valbuf)
+{
+ int len = TYPE_LENGTH (type);
+ int reg, regsz;
+
+ if (TYPE_CODE (type) == TYPE_CODE_PTR)
+ reg = 4;
+ else
+ reg = 0;
+
+ regsz = register_size (gdbarch, reg);
+
+ if (len <= regsz)
+ regcache_raw_write_part (regcache, reg, 0, len, valbuf);
+ else if (len <= 2 * regsz)
+ {
+ regcache_raw_write (regcache, reg, valbuf);
+ gdb_assert (regsz == register_size (gdbarch, reg + 1));
+ regcache_raw_write_part (regcache, reg+1, 0,
+ len - regsz, (char *) valbuf + regsz);
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ _("Cannot store return value %d bytes long."), len);
+}
+
+static void
+mn10300_extract_return_value (struct gdbarch *gdbarch, struct type *type,
+ struct regcache *regcache, void *valbuf)
+{
+ char buf[MAX_REGISTER_SIZE];
+ int len = TYPE_LENGTH (type);
+ int reg, regsz;
+
+ if (TYPE_CODE (type) == TYPE_CODE_PTR)
+ reg = 4;
+ else
+ reg = 0;
+
+ regsz = register_size (gdbarch, reg);
+ if (len <= regsz)
+ {
+ regcache_raw_read (regcache, reg, buf);
+ memcpy (valbuf, buf, len);
+ }
+ else if (len <= 2 * regsz)
+ {
+ regcache_raw_read (regcache, reg, buf);
+ memcpy (valbuf, buf, regsz);
+ gdb_assert (regsz == register_size (gdbarch, reg + 1));
+ regcache_raw_read (regcache, reg + 1, buf);
+ memcpy ((char *) valbuf + regsz, buf, len - regsz);
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ _("Cannot extract return value %d bytes long."), len);
+}
+
+/* Determine, for architecture GDBARCH, how a return value of TYPE
+ should be returned. If it is supposed to be returned in registers,
+ and READBUF is non-zero, read the appropriate value from REGCACHE,
+ and copy it into READBUF. If WRITEBUF is non-zero, write the value
+ from WRITEBUF into REGCACHE. */
+
+static enum return_value_convention
+mn10300_return_value (struct gdbarch *gdbarch, struct type *func_type,
+ struct type *type, struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
+{
+ if (mn10300_use_struct_convention (type))
+ return RETURN_VALUE_STRUCT_CONVENTION;
+
+ if (readbuf)
+ mn10300_extract_return_value (gdbarch, type, regcache, readbuf);
+ if (writebuf)
+ mn10300_store_return_value (gdbarch, type, regcache, writebuf);
+ return RETURN_VALUE_REGISTER_CONVENTION;
+}
static char *
register_name (int reg, char **regs, long sizeof_regs)
}
static const char *
-mn10300_generic_register_name (int reg)
+mn10300_generic_register_name (struct gdbarch *gdbarch, int reg)
{
static char *regs[] =
{ "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
static const char *
-am33_register_name (int reg)
+am33_register_name (struct gdbarch *gdbarch, int reg)
{
static char *regs[] =
{ "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
};
return register_name (reg, regs, sizeof regs);
}
-
-static CORE_ADDR
-mn10300_saved_pc_after_call (struct frame_info *fi)
+
+static const char *
+am33_2_register_name (struct gdbarch *gdbarch, int reg)
{
- return read_memory_integer (read_register (SP_REGNUM), 4);
+ static char *regs[] =
+ {
+ "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
+ "sp", "pc", "mdr", "psw", "lir", "lar", "mdrq", "r0",
+ "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ssp",
+ "msp", "usp", "mcrh", "mcrl", "mcvf", "fpcr", "", "",
+ "fs0", "fs1", "fs2", "fs3", "fs4", "fs5", "fs6", "fs7",
+ "fs8", "fs9", "fs10", "fs11", "fs12", "fs13", "fs14", "fs15",
+ "fs16", "fs17", "fs18", "fs19", "fs20", "fs21", "fs22", "fs23",
+ "fs24", "fs25", "fs26", "fs27", "fs28", "fs29", "fs30", "fs31"
+ };
+ return register_name (reg, regs, sizeof regs);
}
-static void
-mn10300_extract_return_value (struct type *type, char *regbuf, char *valbuf)
+static struct type *
+mn10300_register_type (struct gdbarch *gdbarch, int reg)
{
- if (TYPE_CODE (type) == TYPE_CODE_PTR)
- memcpy (valbuf, regbuf + REGISTER_BYTE (4), TYPE_LENGTH (type));
- else
- memcpy (valbuf, regbuf + REGISTER_BYTE (0), TYPE_LENGTH (type));
+ return builtin_type_int;
}
static CORE_ADDR
-mn10300_extract_struct_value_address (char *regbuf)
+mn10300_read_pc (struct regcache *regcache)
{
- return extract_address (regbuf + REGISTER_BYTE (4),
- REGISTER_RAW_SIZE (4));
+ ULONGEST val;
+ regcache_cooked_read_unsigned (regcache, E_PC_REGNUM, &val);
+ return val;
}
static void
-mn10300_store_return_value (struct type *type, char *valbuf)
-{
- if (TYPE_CODE (type) == TYPE_CODE_PTR)
- deprecated_write_register_bytes (REGISTER_BYTE (4), valbuf,
- TYPE_LENGTH (type));
- else
- deprecated_write_register_bytes (REGISTER_BYTE (0), valbuf,
- TYPE_LENGTH (type));
-}
-
-static struct frame_info *analyze_dummy_frame (CORE_ADDR, CORE_ADDR);
-static struct frame_info *
-analyze_dummy_frame (CORE_ADDR pc, CORE_ADDR frame)
-{
- static struct frame_info *dummy = NULL;
- if (dummy == NULL)
- {
- struct frame_extra_info *extra_info;
- CORE_ADDR *saved_regs;
- dummy = deprecated_frame_xmalloc ();
- saved_regs = xmalloc (SIZEOF_FRAME_SAVED_REGS);
- deprecated_set_frame_saved_regs_hack (dummy, saved_regs);
- extra_info = XMALLOC (struct frame_extra_info);
- deprecated_set_frame_extra_info_hack (dummy, extra_info);
- }
- deprecated_set_frame_next_hack (dummy, NULL);
- deprecated_set_frame_prev_hack (dummy, NULL);
- deprecated_update_frame_pc_hack (dummy, pc);
- deprecated_update_frame_base_hack (dummy, frame);
- get_frame_extra_info (dummy)->status = 0;
- get_frame_extra_info (dummy)->stack_size = 0;
- memset (get_frame_saved_regs (dummy), '\000', SIZEOF_FRAME_SAVED_REGS);
- mn10300_analyze_prologue (dummy, 0);
- return dummy;
-}
-
-/* Values for frame_info.status */
-
-#define MY_FRAME_IN_SP 0x1
-#define MY_FRAME_IN_FP 0x2
-#define NO_MORE_FRAMES 0x4
-
-
-/* Should call_function allocate stack space for a struct return? */
-static int
-mn10300_use_struct_convention (int gcc_p, struct type *type)
+mn10300_write_pc (struct regcache *regcache, CORE_ADDR val)
{
- return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 8);
+ regcache_cooked_write_unsigned (regcache, E_PC_REGNUM, val);
}
/* The breakpoint instruction must be the same size as the smallest
one, so we defined it ourselves. */
const static unsigned char *
-mn10300_breakpoint_from_pc (CORE_ADDR *bp_addr, int *bp_size)
+mn10300_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *bp_addr,
+ int *bp_size)
{
- static char breakpoint[] =
- {0xff};
+ static char breakpoint[] = {0xff};
*bp_size = 1;
return breakpoint;
}
-
-/* Fix fi->frame if it's bogus at this point. This is a helper
- function for mn10300_analyze_prologue. */
+/* Set offsets of saved registers.
+ This is a helper function for mn10300_analyze_prologue. */
static void
-fix_frame_pointer (struct frame_info *fi, int stack_size)
+set_reg_offsets (struct frame_info *fi,
+ void **this_cache,
+ int movm_args,
+ int fpregmask,
+ int stack_extra_size,
+ int frame_in_fp)
{
- if (fi && get_next_frame (fi) == NULL)
+ struct gdbarch *gdbarch;
+ struct trad_frame_cache *cache;
+ int offset = 0;
+ CORE_ADDR base;
+
+ if (fi == NULL || this_cache == NULL)
+ return;
+
+ cache = mn10300_frame_unwind_cache (fi, this_cache);
+ if (cache == NULL)
+ return;
+ gdbarch = get_frame_arch (fi);
+
+ if (frame_in_fp)
{
- if (get_frame_extra_info (fi)->status & MY_FRAME_IN_SP)
- deprecated_update_frame_base_hack (fi, read_sp () - stack_size);
- else if (get_frame_extra_info (fi)->status & MY_FRAME_IN_FP)
- deprecated_update_frame_base_hack (fi, read_register (A3_REGNUM));
+ base = frame_unwind_register_unsigned (fi, E_A3_REGNUM);
+ }
+ else
+ {
+ base = frame_unwind_register_unsigned (fi, E_SP_REGNUM)
+ + stack_extra_size;
}
-}
-
-/* Set offsets of registers saved by movm instruction.
- This is a helper function for mn10300_analyze_prologue. */
+ trad_frame_set_this_base (cache, base);
-static void
-set_movm_offsets (struct frame_info *fi, int movm_args)
-{
- int offset = 0;
+ if (AM33_MODE (gdbarch) == 2)
+ {
+ /* If bit N is set in fpregmask, fsN is saved on the stack.
+ The floating point registers are saved in ascending order.
+ For example: fs16 <- Frame Pointer
+ fs17 Frame Pointer + 4 */
+ if (fpregmask != 0)
+ {
+ int i;
+ for (i = 0; i < 32; i++)
+ {
+ if (fpregmask & (1 << i))
+ {
+ trad_frame_set_reg_addr (cache, E_FS0_REGNUM + i,
+ base + offset);
+ offset += 4;
+ }
+ }
+ }
+ }
- if (fi == NULL || movm_args == 0)
- return;
if (movm_args & movm_other_bit)
{
/* The `other' bit leaves a blank area of four bytes at the
beginning of its block of saved registers, making it 32 bytes
long in total. */
- get_frame_saved_regs (fi)[LAR_REGNUM] = get_frame_base (fi) + offset + 4;
- get_frame_saved_regs (fi)[LIR_REGNUM] = get_frame_base (fi) + offset + 8;
- get_frame_saved_regs (fi)[MDR_REGNUM] = get_frame_base (fi) + offset + 12;
- get_frame_saved_regs (fi)[A0_REGNUM + 1] = get_frame_base (fi) + offset + 16;
- get_frame_saved_regs (fi)[A0_REGNUM] = get_frame_base (fi) + offset + 20;
- get_frame_saved_regs (fi)[D0_REGNUM + 1] = get_frame_base (fi) + offset + 24;
- get_frame_saved_regs (fi)[D0_REGNUM] = get_frame_base (fi) + offset + 28;
+ trad_frame_set_reg_addr (cache, E_LAR_REGNUM, base + offset + 4);
+ trad_frame_set_reg_addr (cache, E_LIR_REGNUM, base + offset + 8);
+ trad_frame_set_reg_addr (cache, E_MDR_REGNUM, base + offset + 12);
+ trad_frame_set_reg_addr (cache, E_A0_REGNUM + 1, base + offset + 16);
+ trad_frame_set_reg_addr (cache, E_A0_REGNUM, base + offset + 20);
+ trad_frame_set_reg_addr (cache, E_D0_REGNUM + 1, base + offset + 24);
+ trad_frame_set_reg_addr (cache, E_D0_REGNUM, base + offset + 28);
offset += 32;
}
+
if (movm_args & movm_a3_bit)
{
- get_frame_saved_regs (fi)[A3_REGNUM] = get_frame_base (fi) + offset;
+ trad_frame_set_reg_addr (cache, E_A3_REGNUM, base + offset);
offset += 4;
}
if (movm_args & movm_a2_bit)
{
- get_frame_saved_regs (fi)[A2_REGNUM] = get_frame_base (fi) + offset;
+ trad_frame_set_reg_addr (cache, E_A2_REGNUM, base + offset);
offset += 4;
}
if (movm_args & movm_d3_bit)
{
- get_frame_saved_regs (fi)[D3_REGNUM] = get_frame_base (fi) + offset;
+ trad_frame_set_reg_addr (cache, E_D3_REGNUM, base + offset);
offset += 4;
}
if (movm_args & movm_d2_bit)
{
- get_frame_saved_regs (fi)[D2_REGNUM] = get_frame_base (fi) + offset;
+ trad_frame_set_reg_addr (cache, E_D2_REGNUM, base + offset);
offset += 4;
}
- if (AM33_MODE)
+ if (AM33_MODE (gdbarch))
{
if (movm_args & movm_exother_bit)
{
- get_frame_saved_regs (fi)[MCVF_REGNUM] = get_frame_base (fi) + offset;
- get_frame_saved_regs (fi)[MCRL_REGNUM] = get_frame_base (fi) + offset + 4;
- get_frame_saved_regs (fi)[MCRH_REGNUM] = get_frame_base (fi) + offset + 8;
- get_frame_saved_regs (fi)[MDRQ_REGNUM] = get_frame_base (fi) + offset + 12;
- get_frame_saved_regs (fi)[E0_REGNUM + 1] = get_frame_base (fi) + offset + 16;
- get_frame_saved_regs (fi)[E0_REGNUM + 0] = get_frame_base (fi) + offset + 20;
+ trad_frame_set_reg_addr (cache, E_MCVF_REGNUM, base + offset);
+ trad_frame_set_reg_addr (cache, E_MCRL_REGNUM, base + offset + 4);
+ trad_frame_set_reg_addr (cache, E_MCRH_REGNUM, base + offset + 8);
+ trad_frame_set_reg_addr (cache, E_MDRQ_REGNUM, base + offset + 12);
+ trad_frame_set_reg_addr (cache, E_E1_REGNUM, base + offset + 16);
+ trad_frame_set_reg_addr (cache, E_E0_REGNUM, base + offset + 20);
offset += 24;
}
if (movm_args & movm_exreg1_bit)
{
- get_frame_saved_regs (fi)[E0_REGNUM + 7] = get_frame_base (fi) + offset;
- get_frame_saved_regs (fi)[E0_REGNUM + 6] = get_frame_base (fi) + offset + 4;
- get_frame_saved_regs (fi)[E0_REGNUM + 5] = get_frame_base (fi) + offset + 8;
- get_frame_saved_regs (fi)[E0_REGNUM + 4] = get_frame_base (fi) + offset + 12;
+ trad_frame_set_reg_addr (cache, E_E7_REGNUM, base + offset);
+ trad_frame_set_reg_addr (cache, E_E6_REGNUM, base + offset + 4);
+ trad_frame_set_reg_addr (cache, E_E5_REGNUM, base + offset + 8);
+ trad_frame_set_reg_addr (cache, E_E4_REGNUM, base + offset + 12);
offset += 16;
}
if (movm_args & movm_exreg0_bit)
{
- get_frame_saved_regs (fi)[E0_REGNUM + 3] = get_frame_base (fi) + offset;
- get_frame_saved_regs (fi)[E0_REGNUM + 2] = get_frame_base (fi) + offset + 4;
+ trad_frame_set_reg_addr (cache, E_E3_REGNUM, base + offset);
+ trad_frame_set_reg_addr (cache, E_E2_REGNUM, base + offset + 4);
offset += 8;
}
}
+ /* The last (or first) thing on the stack will be the PC. */
+ trad_frame_set_reg_addr (cache, E_PC_REGNUM, base + offset);
+ /* Save the SP in the 'traditional' way.
+ This will be the same location where the PC is saved. */
+ trad_frame_set_reg_value (cache, E_SP_REGNUM, base + offset);
}
-
/* The main purpose of this file is dealing with prologues to extract
information about stack frames and saved registers.
frame chain to not bother trying to unwind past this frame. */
static CORE_ADDR
-mn10300_analyze_prologue (struct frame_info *fi, CORE_ADDR pc)
+mn10300_analyze_prologue (struct gdbarch *gdbarch, struct frame_info *fi,
+ void **this_cache,
+ CORE_ADDR pc)
{
CORE_ADDR func_addr, func_end, addr, stop;
- CORE_ADDR stack_size;
+ long stack_extra_size = 0;
int imm_size;
unsigned char buf[4];
- int status, movm_args = 0;
+ int status;
+ int movm_args = 0;
+ int fpregmask = 0;
char *name;
+ int frame_in_fp = 0;
/* Use the PC in the frame if it's provided to look up the
- start of this function. */
- pc = (fi ? get_frame_pc (fi) : pc);
+ start of this function.
+
+ Note: kevinb/2003-07-16: We used to do the following here:
+ pc = (fi ? get_frame_pc (fi) : pc);
+ But this is (now) badly broken when called from analyze_dummy_frame().
+ */
+ if (fi)
+ {
+ pc = (pc ? pc : get_frame_pc (fi));
+ }
/* Find the start of this function. */
status = find_pc_partial_function (pc, &name, &func_addr, &func_end);
- /* Do nothing if we couldn't find the start of this function or if we're
- stopped at the first instruction in the prologue. */
+ /* Do nothing if we couldn't find the start of this function
+
+ MVS: comment went on to say "or if we're stopped at the first
+ instruction in the prologue" -- but code doesn't reflect that,
+ and I don't want to do that anyway. */
if (status == 0)
{
- return pc;
+ addr = pc;
+ goto finish_prologue;
}
/* If we're in start, then give up. */
if (strcmp (name, "start") == 0)
{
- if (fi != NULL)
- get_frame_extra_info (fi)->status = NO_MORE_FRAMES;
- return pc;
- }
-
- /* At the start of a function our frame is in the stack pointer. */
- if (fi)
- get_frame_extra_info (fi)->status = MY_FRAME_IN_SP;
-
- /* Get the next two bytes into buf, we need two because rets is a two
- byte insn and the first isn't enough to uniquely identify it. */
- status = read_memory_nobpt (pc, buf, 2);
- if (status != 0)
- return pc;
-
- /* If we're physically on an "rets" instruction, then our frame has
- already been deallocated. Note this can also be true for retf
- and ret if they specify a size of zero.
-
- In this case fi->frame is bogus, we need to fix it. */
- if (fi && buf[0] == 0xf0 && buf[1] == 0xfc)
- {
- if (get_next_frame (fi) == NULL)
- deprecated_update_frame_base_hack (fi, read_sp ());
- return get_frame_pc (fi);
- }
-
- /* Similarly if we're stopped on the first insn of a prologue as our
- frame hasn't been allocated yet. */
- if (fi && get_frame_pc (fi) == func_addr)
- {
- if (get_next_frame (fi) == NULL)
- deprecated_update_frame_base_hack (fi, read_sp ());
- return get_frame_pc (fi);
+ addr = pc;
+ goto finish_prologue;
}
/* Figure out where to stop scanning. */
- stop = fi ? get_frame_pc (fi) : func_end;
+ stop = fi ? pc : func_end;
/* Don't walk off the end of the function. */
stop = stop > func_end ? func_end : stop;
addr = func_addr;
/* Suck in two bytes. */
- status = read_memory_nobpt (addr, buf, 2);
- if (status != 0)
- {
- fix_frame_pointer (fi, 0);
- return addr;
- }
+ if (addr + 2 > stop || !safe_frame_unwind_memory (fi, addr, buf, 2))
+ goto finish_prologue;
/* First see if this insn sets the stack pointer from a register; if
so, it's probably the initialization of the stack pointer in _start,
so mark this as the bottom-most frame. */
if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0)
{
- if (fi)
- get_frame_extra_info (fi)->status = NO_MORE_FRAMES;
- return addr;
+ goto finish_prologue;
}
/* Now look for movm [regs],sp, which saves the callee saved registers.
if (buf[0] == 0xcf)
{
/* Extract the register list for the movm instruction. */
- status = read_memory_nobpt (addr + 1, buf, 1);
- movm_args = *buf;
+ movm_args = buf[1];
addr += 2;
/* Quit now if we're beyond the stop point. */
if (addr >= stop)
- {
- /* Fix fi->frame since it's bogus at this point. */
- if (fi && get_next_frame (fi) == NULL)
- deprecated_update_frame_base_hack (fi, read_sp ());
+ goto finish_prologue;
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, movm_args);
- return addr;
- }
+ /* Get the next two bytes so the prologue scan can continue. */
+ if (!safe_frame_unwind_memory (fi, addr, buf, 2))
+ goto finish_prologue;
+ }
+
+ /* Check for "mov pc, a2", an instruction found in optimized, position
+ independent code. Skip it if found. */
+ if (buf[0] == 0xf0 && buf[1] == 0x2e)
+ {
+ addr += 2;
+
+ /* Quit now if we're beyond the stop point. */
+ if (addr >= stop)
+ goto finish_prologue;
/* Get the next two bytes so the prologue scan can continue. */
- status = read_memory_nobpt (addr, buf, 2);
+ status = target_read_memory (addr, buf, 2);
if (status != 0)
+ goto finish_prologue;
+ }
+
+ if (AM33_MODE (gdbarch) == 2)
+ {
+ /* Determine if any floating point registers are to be saved.
+ Look for one of the following three prologue formats:
+
+ [movm [regs],(sp)] [movm [regs],(sp)] [movm [regs],(sp)]
+
+ add -SIZE,sp add -SIZE,sp add -SIZE,sp
+ fmov fs#,(sp) mov sp,a0/a1 mov sp,a0/a1
+ fmov fs#,(#,sp) fmov fs#,(a0/a1+) add SIZE2,a0/a1
+ ... ... fmov fs#,(a0/a1+)
+ ... ... ...
+ fmov fs#,(#,sp) fmov fs#,(a0/a1+) fmov fs#,(a0/a1+)
+
+ [mov sp,a3] [mov sp,a3]
+ [add -SIZE2,sp] [add -SIZE2,sp] */
+
+ /* Remember the address at which we started in the event that we
+ don't ultimately find an fmov instruction. Once we're certain
+ that we matched one of the above patterns, we'll set
+ ``restore_addr'' to the appropriate value. Note: At one time
+ in the past, this code attempted to not adjust ``addr'' until
+ there was a fair degree of certainty that the pattern would be
+ matched. However, that code did not wait until an fmov instruction
+ was actually encountered. As a consequence, ``addr'' would
+ sometimes be advanced even when no fmov instructions were found. */
+ CORE_ADDR restore_addr = addr;
+ int fmov_found = 0;
+
+ /* First, look for add -SIZE,sp (i.e. add imm8,sp (0xf8feXX)
+ or add imm16,sp (0xfafeXXXX)
+ or add imm32,sp (0xfcfeXXXXXXXX)) */
+ imm_size = 0;
+ if (buf[0] == 0xf8 && buf[1] == 0xfe)
+ imm_size = 1;
+ else if (buf[0] == 0xfa && buf[1] == 0xfe)
+ imm_size = 2;
+ else if (buf[0] == 0xfc && buf[1] == 0xfe)
+ imm_size = 4;
+ if (imm_size != 0)
{
- /* Fix fi->frame since it's bogus at this point. */
- if (fi && get_next_frame (fi) == NULL)
- deprecated_update_frame_base_hack (fi, read_sp ());
+ /* An "add -#,sp" instruction has been found. "addr + 2 + imm_size"
+ is the address of the next instruction. Don't modify "addr" until
+ the next "floating point prologue" instruction is found. If this
+ is not a prologue that saves floating point registers we need to
+ be able to back out of this bit of code and continue with the
+ prologue analysis. */
+ if (addr + 2 + imm_size < stop)
+ {
+ if (!safe_frame_unwind_memory (fi, addr + 2 + imm_size, buf, 3))
+ goto finish_prologue;
+ if ((buf[0] & 0xfc) == 0x3c)
+ {
+ /* Occasionally, especially with C++ code, the "fmov"
+ instructions will be preceded by "mov sp,aN"
+ (aN => a0, a1, a2, or a3).
+
+ This is a one byte instruction: mov sp,aN = 0011 11XX
+ where XX is the register number.
+
+ Skip this instruction by incrementing addr. The "fmov"
+ instructions will have the form "fmov fs#,(aN+)" in this
+ case, but that will not necessitate a change in the
+ "fmov" parsing logic below. */
+
+ addr++;
+
+ if ((buf[1] & 0xfc) == 0x20)
+ {
+ /* Occasionally, especially with C++ code compiled with
+ the -fomit-frame-pointer or -O3 options, the
+ "mov sp,aN" instruction will be followed by an
+ "add #,aN" instruction. This indicates the
+ "stack_size", the size of the portion of the stack
+ containing the arguments. This instruction format is:
+ add #,aN = 0010 00XX YYYY YYYY
+ where XX is the register number
+ YYYY YYYY is the constant.
+ Note the size of the stack (as a negative number) in
+ the frame info structure. */
+ if (fi)
+ stack_extra_size += -buf[2];
+
+ addr += 2;
+ }
+ }
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, movm_args);
- return addr;
+ if ((buf[0] & 0xfc) == 0x3c ||
+ buf[0] == 0xf9 || buf[0] == 0xfb)
+ {
+ /* An "fmov" instruction has been found indicating that this
+ prologue saves floating point registers (or, as described
+ above, a "mov sp,aN" and possible "add #,aN" have been
+ found and we will assume an "fmov" follows). Process the
+ consecutive "fmov" instructions. */
+ for (addr += 2 + imm_size;;addr += imm_size)
+ {
+ int regnum;
+
+ /* Read the "fmov" instruction. */
+ if (addr >= stop ||
+ !safe_frame_unwind_memory (fi, addr, buf, 4))
+ goto finish_prologue;
+
+ if (buf[0] != 0xf9 && buf[0] != 0xfb)
+ break;
+
+ /* An fmov instruction has just been seen. We can
+ now really commit to the pattern match. */
+
+ fmov_found = 1;
+
+ /* Get the floating point register number from the
+ 2nd and 3rd bytes of the "fmov" instruction:
+ Machine Code: 0000 00X0 YYYY 0000 =>
+ Regnum: 000X YYYY */
+ regnum = (buf[1] & 0x02) << 3;
+ regnum |= ((buf[2] & 0xf0) >> 4) & 0x0f;
+
+ /* Add this register number to the bit mask of floating
+ point registers that have been saved. */
+ fpregmask |= 1 << regnum;
+
+ /* Determine the length of this "fmov" instruction.
+ fmov fs#,(sp) => 3 byte instruction
+ fmov fs#,(#,sp) => 4 byte instruction */
+ imm_size = (buf[0] == 0xf9) ? 3 : 4;
+ }
+ }
+ }
+ }
+ /* If no fmov instructions were found by the above sequence, reset
+ the state and pretend that the above bit of code never happened. */
+ if (!fmov_found)
+ {
+ addr = restore_addr;
+ status = target_read_memory (addr, buf, 2);
+ if (status != 0)
+ goto finish_prologue;
+ stack_extra_size = 0;
}
}
/* The frame pointer is now valid. */
if (fi)
{
- get_frame_extra_info (fi)->status |= MY_FRAME_IN_FP;
- get_frame_extra_info (fi)->status &= ~MY_FRAME_IN_SP;
+ frame_in_fp = 1;
}
/* Quit now if we're beyond the stop point. */
if (addr >= stop)
- {
- /* Fix fi->frame if it's bogus at this point. */
- fix_frame_pointer (fi, 0);
-
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, movm_args);
- return addr;
- }
+ goto finish_prologue;
/* Get two more bytes so scanning can continue. */
- status = read_memory_nobpt (addr, buf, 2);
- if (status != 0)
- {
- /* Fix fi->frame if it's bogus at this point. */
- fix_frame_pointer (fi, 0);
-
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, movm_args);
- return addr;
- }
+ if (!safe_frame_unwind_memory (fi, addr, buf, 2))
+ goto finish_prologue;
}
/* Next we should allocate the local frame. No more prologue insns
If none of the above was found, then this prologue has no
additional stack. */
- status = read_memory_nobpt (addr, buf, 2);
- if (status != 0)
- {
- /* Fix fi->frame if it's bogus at this point. */
- fix_frame_pointer (fi, 0);
-
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, movm_args);
- return addr;
- }
-
imm_size = 0;
if (buf[0] == 0xf8 && buf[1] == 0xfe)
imm_size = 1;
{
/* Suck in imm_size more bytes, they'll hold the size of the
current frame. */
- status = read_memory_nobpt (addr + 2, buf, imm_size);
- if (status != 0)
- {
- /* Fix fi->frame if it's bogus at this point. */
- fix_frame_pointer (fi, 0);
+ if (!safe_frame_unwind_memory (fi, addr + 2, buf, imm_size))
+ goto finish_prologue;
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, movm_args);
- return addr;
- }
-
- /* Note the size of the stack in the frame info structure. */
- stack_size = extract_signed_integer (buf, imm_size);
- if (fi)
- get_frame_extra_info (fi)->stack_size = stack_size;
+ /* Note the size of the stack. */
+ stack_extra_size -= extract_signed_integer (buf, imm_size);
/* We just consumed 2 + imm_size bytes. */
addr += 2 + imm_size;
/* No more prologue insns follow, so begin preparation to return. */
- /* Fix fi->frame if it's bogus at this point. */
- fix_frame_pointer (fi, stack_size);
-
- /* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, movm_args);
- return addr;
+ goto finish_prologue;
}
-
- /* We never found an insn which allocates local stack space, regardless
- this is the end of the prologue. */
- /* Fix fi->frame if it's bogus at this point. */
- fix_frame_pointer (fi, 0);
-
+ /* Do the essentials and get out of here. */
+ finish_prologue:
/* Note if/where callee saved registers were saved. */
- set_movm_offsets (fi, movm_args);
+ if (fi)
+ set_reg_offsets (fi, this_cache, movm_args, fpregmask, stack_extra_size,
+ frame_in_fp);
return addr;
}
+/* Function: skip_prologue
+ Return the address of the first inst past the prologue of the function. */
-/* Function: saved_regs_size
- Return the size in bytes of the register save area, based on the
- saved_regs array in FI. */
-static int
-saved_regs_size (struct frame_info *fi)
+static CORE_ADDR
+mn10300_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- int adjust = 0;
- int i;
-
- /* Reserve four bytes for every register saved. */
- for (i = 0; i < NUM_REGS; i++)
- if (get_frame_saved_regs (fi)[i])
- adjust += 4;
-
- /* If we saved LIR, then it's most likely we used a `movm'
- instruction with the `other' bit set, in which case the SP is
- decremented by an extra four bytes, "to simplify calculation
- of the transfer area", according to the processor manual. */
- if (get_frame_saved_regs (fi)[LIR_REGNUM])
- adjust += 4;
-
- return adjust;
+ return mn10300_analyze_prologue (gdbarch, NULL, NULL, pc);
}
-
-/* Function: frame_chain
- Figure out and return the caller's frame pointer given current
- frame_info struct.
-
- We don't handle dummy frames yet but we would probably just return the
- stack pointer that was in use at the time the function call was made? */
-
-static CORE_ADDR
-mn10300_frame_chain (struct frame_info *fi)
+/* Simple frame_unwind_cache.
+ This finds the "extra info" for the frame. */
+struct trad_frame_cache *
+mn10300_frame_unwind_cache (struct frame_info *this_frame,
+ void **this_prologue_cache)
{
- struct frame_info *dummy;
- /* Walk through the prologue to determine the stack size,
- location of saved registers, end of the prologue, etc. */
- if (get_frame_extra_info (fi)->status == 0)
- mn10300_analyze_prologue (fi, (CORE_ADDR) 0);
+ struct gdbarch *gdbarch;
+ struct trad_frame_cache *cache;
+ CORE_ADDR pc, start, end;
+ void *cache_p;
+
+ if (*this_prologue_cache)
+ return (*this_prologue_cache);
+
+ gdbarch = get_frame_arch (this_frame);
+ cache_p = trad_frame_cache_zalloc (this_frame);
+ pc = get_frame_register_unsigned (this_frame, E_PC_REGNUM);
+ mn10300_analyze_prologue (gdbarch, this_frame, &cache_p, pc);
+ cache = cache_p;
+
+ if (find_pc_partial_function (pc, NULL, &start, &end))
+ trad_frame_set_id (cache,
+ frame_id_build (trad_frame_get_this_base (cache),
+ start));
+ else
+ {
+ start = get_frame_func (this_frame);
+ trad_frame_set_id (cache,
+ frame_id_build (trad_frame_get_this_base (cache),
+ start));
+ }
- /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES. */
- if (get_frame_extra_info (fi)->status & NO_MORE_FRAMES)
- return 0;
+ (*this_prologue_cache) = cache;
+ return cache;
+}
- /* Now that we've analyzed our prologue, determine the frame
- pointer for our caller.
+/* Here is a dummy implementation. */
+static struct frame_id
+mn10300_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
+{
+ CORE_ADDR sp = get_frame_register_unsigned (this_frame, E_SP_REGNUM);
+ CORE_ADDR pc = get_frame_register_unsigned (this_frame, E_PC_REGNUM);
+ return frame_id_build (sp, pc);
+}
- If our caller has a frame pointer, then we need to
- find the entry value of $a3 to our function.
+/* Trad frame implementation. */
+static void
+mn10300_frame_this_id (struct frame_info *this_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
+{
+ struct trad_frame_cache *cache =
+ mn10300_frame_unwind_cache (this_frame, this_prologue_cache);
- If fsr.regs[A3_REGNUM] is nonzero, then it's at the memory
- location pointed to by fsr.regs[A3_REGNUM].
+ trad_frame_get_id (cache, this_id);
+}
- Else it's still in $a3.
+static struct value *
+mn10300_frame_prev_register (struct frame_info *this_frame,
+ void **this_prologue_cache, int regnum)
+{
+ struct trad_frame_cache *cache =
+ mn10300_frame_unwind_cache (this_frame, this_prologue_cache);
- If our caller does not have a frame pointer, then his
- frame base is fi->frame + -caller's stack size. */
+ return trad_frame_get_register (cache, this_frame, regnum);
+}
- /* The easiest way to get that info is to analyze our caller's frame.
- So we set up a dummy frame and call mn10300_analyze_prologue to
- find stuff for us. */
- dummy = analyze_dummy_frame (DEPRECATED_FRAME_SAVED_PC (fi), get_frame_base (fi));
+static const struct frame_unwind mn10300_frame_unwind = {
+ NORMAL_FRAME,
+ mn10300_frame_this_id,
+ mn10300_frame_prev_register,
+ NULL,
+ default_frame_sniffer
+};
- if (get_frame_extra_info (dummy)->status & MY_FRAME_IN_FP)
- {
- /* Our caller has a frame pointer. So find the frame in $a3 or
- in the stack. */
- if (get_frame_saved_regs (fi)[A3_REGNUM])
- return (read_memory_integer (get_frame_saved_regs (fi)[A3_REGNUM], REGISTER_SIZE));
- else
- return read_register (A3_REGNUM);
- }
- else
- {
- int adjust = saved_regs_size (fi);
+static CORE_ADDR
+mn10300_frame_base_address (struct frame_info *this_frame,
+ void **this_prologue_cache)
+{
+ struct trad_frame_cache *cache =
+ mn10300_frame_unwind_cache (this_frame, this_prologue_cache);
- /* Our caller does not have a frame pointer. So his frame starts
- at the base of our frame (fi->frame) + register save space
- + <his size>. */
- return get_frame_base (fi) + adjust + -get_frame_extra_info (dummy)->stack_size;
- }
+ return trad_frame_get_this_base (cache);
}
-/* Function: skip_prologue
- Return the address of the first inst past the prologue of the function. */
+static const struct frame_base mn10300_frame_base = {
+ &mn10300_frame_unwind,
+ mn10300_frame_base_address,
+ mn10300_frame_base_address,
+ mn10300_frame_base_address
+};
static CORE_ADDR
-mn10300_skip_prologue (CORE_ADDR pc)
+mn10300_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
- /* We used to check the debug symbols, but that can lose if
- we have a null prologue. */
- return mn10300_analyze_prologue (NULL, pc);
+ ULONGEST pc;
+
+ pc = frame_unwind_register_unsigned (next_frame, E_PC_REGNUM);
+ return pc;
}
-/* generic_pop_current_frame calls this function if the current
- frame isn't a dummy frame. */
-static void
-mn10300_pop_frame_regular (struct frame_info *frame)
+static CORE_ADDR
+mn10300_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
- int regnum;
-
- write_register (PC_REGNUM, DEPRECATED_FRAME_SAVED_PC (frame));
-
- /* Restore any saved registers. */
- for (regnum = 0; regnum < NUM_REGS; regnum++)
- if (get_frame_saved_regs (frame)[regnum] != 0)
- {
- ULONGEST value;
-
- value = read_memory_unsigned_integer (get_frame_saved_regs (frame)[regnum],
- REGISTER_RAW_SIZE (regnum));
- write_register (regnum, value);
- }
+ ULONGEST sp;
- /* Actually cut back the stack. */
- write_register (SP_REGNUM, get_frame_base (frame));
-
- /* Don't we need to set the PC?!? XXX FIXME. */
+ sp = frame_unwind_register_unsigned (next_frame, E_SP_REGNUM);
+ return sp;
}
-/* Function: pop_frame
- This routine gets called when either the user uses the `return'
- command, or the call dummy breakpoint gets hit. */
static void
-mn10300_pop_frame (void)
+mn10300_frame_unwind_init (struct gdbarch *gdbarch)
{
- /* This function checks for and handles generic dummy frames, and
- calls back to our function for ordinary frames. */
- generic_pop_current_frame (mn10300_pop_frame_regular);
-
- /* Throw away any cached frame information. */
- flush_cached_frames ();
+ dwarf2_append_unwinders (gdbarch);
+ frame_unwind_append_unwinder (gdbarch, &mn10300_frame_unwind);
+ frame_base_set_default (gdbarch, &mn10300_frame_base);
+ set_gdbarch_dummy_id (gdbarch, mn10300_dummy_id);
+ set_gdbarch_unwind_pc (gdbarch, mn10300_unwind_pc);
+ set_gdbarch_unwind_sp (gdbarch, mn10300_unwind_sp);
}
-/* Function: push_arguments
- Setup arguments for a call to the target. Arguments go in
- order on the stack. */
+/* Function: push_dummy_call
+ *
+ * Set up machine state for a target call, including
+ * function arguments, stack, return address, etc.
+ *
+ */
static CORE_ADDR
-mn10300_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
- int struct_return, CORE_ADDR struct_addr)
+mn10300_push_dummy_call (struct gdbarch *gdbarch,
+ struct value *target_func,
+ struct regcache *regcache,
+ CORE_ADDR bp_addr,
+ int nargs, struct value **args,
+ CORE_ADDR sp,
+ int struct_return,
+ CORE_ADDR struct_addr)
{
- int argnum = 0;
- int len = 0;
+ const int push_size = register_size (gdbarch, E_PC_REGNUM);
+ int regs_used;
+ int len, arg_len;
int stack_offset = 0;
- int regsused = struct_return ? 1 : 0;
+ int argnum;
+ char *val, valbuf[MAX_REGISTER_SIZE];
/* This should be a nop, but align the stack just in case something
went wrong. Stacks are four byte aligned on the mn10300. */
XXX This doesn't appear to handle pass-by-invisible reference
arguments. */
- for (argnum = 0; argnum < nargs; argnum++)
+ regs_used = struct_return ? 1 : 0;
+ for (len = 0, argnum = 0; argnum < nargs; argnum++)
{
- int arg_length = (TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3;
-
- while (regsused < 2 && arg_length > 0)
+ arg_len = (TYPE_LENGTH (value_type (args[argnum])) + 3) & ~3;
+ while (regs_used < 2 && arg_len > 0)
{
- regsused++;
- arg_length -= 4;
+ regs_used++;
+ arg_len -= push_size;
}
- len += arg_length;
+ len += arg_len;
}
/* Allocate stack space. */
sp -= len;
- regsused = struct_return ? 1 : 0;
+ if (struct_return)
+ {
+ regs_used = 1;
+ regcache_cooked_write_unsigned (regcache, E_D0_REGNUM, struct_addr);
+ }
+ else
+ regs_used = 0;
+
/* Push all arguments onto the stack. */
for (argnum = 0; argnum < nargs; argnum++)
{
- int len;
- char *val;
-
- /* XXX Check this. What about UNIONS? */
- if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT
- && TYPE_LENGTH (VALUE_TYPE (*args)) > 8)
+ /* FIXME what about structs? Unions? */
+ if (TYPE_CODE (value_type (*args)) == TYPE_CODE_STRUCT
+ && TYPE_LENGTH (value_type (*args)) > 8)
{
- /* XXX Wrong, we want a pointer to this argument. */
- len = TYPE_LENGTH (VALUE_TYPE (*args));
- val = (char *) VALUE_CONTENTS (*args);
+ /* Change to pointer-to-type. */
+ arg_len = push_size;
+ store_unsigned_integer (valbuf, push_size,
+ VALUE_ADDRESS (*args));
+ val = &valbuf[0];
}
else
{
- len = TYPE_LENGTH (VALUE_TYPE (*args));
- val = (char *) VALUE_CONTENTS (*args);
+ arg_len = TYPE_LENGTH (value_type (*args));
+ val = (char *) value_contents (*args);
}
- while (regsused < 2 && len > 0)
+ while (regs_used < 2 && arg_len > 0)
{
- write_register (regsused, extract_unsigned_integer (val, 4));
- val += 4;
- len -= 4;
- regsused++;
+ regcache_cooked_write_unsigned (regcache, regs_used,
+ extract_unsigned_integer (val, push_size));
+ val += push_size;
+ arg_len -= push_size;
+ regs_used++;
}
- while (len > 0)
+ while (arg_len > 0)
{
- write_memory (sp + stack_offset, val, 4);
- len -= 4;
- val += 4;
- stack_offset += 4;
+ write_memory (sp + stack_offset, val, push_size);
+ arg_len -= push_size;
+ val += push_size;
+ stack_offset += push_size;
}
args++;
/* Make space for the flushback area. */
sp -= 8;
- return sp;
-}
-
-/* Function: push_return_address (pc)
- Set up the return address for the inferior function call.
- Needed for targets where we don't actually execute a JSR/BSR instruction */
-
-static CORE_ADDR
-mn10300_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
-{
- unsigned char buf[4];
- store_unsigned_integer (buf, 4, CALL_DUMMY_ADDRESS ());
- write_memory (sp - 4, buf, 4);
- return sp - 4;
-}
-
-/* Function: store_struct_return (addr,sp)
- Store the structure value return address for an inferior function
- call. */
-
-static void
-mn10300_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
-{
- /* The structure return address is passed as the first argument. */
- write_register (0, addr);
-}
-
-/* Function: frame_saved_pc
- Find the caller of this frame. We do this by seeing if RP_REGNUM
- is saved in the stack anywhere, otherwise we get it from the
- registers. If the inner frame is a dummy frame, return its PC
- instead of RP, because that's where "caller" of the dummy-frame
- will be found. */
-
-static CORE_ADDR
-mn10300_frame_saved_pc (struct frame_info *fi)
-{
- int adjust = saved_regs_size (fi);
-
- return (read_memory_integer (get_frame_base (fi) + adjust, REGISTER_SIZE));
-}
-
-/* Function: mn10300_init_extra_frame_info
- Setup the frame's frame pointer, pc, and frame addresses for saved
- registers. Most of the work is done in mn10300_analyze_prologue().
-
- Note that when we are called for the last frame (currently active frame),
- that get_frame_pc (fi) and fi->frame will already be setup. However, fi->frame will
- be valid only if this routine uses FP. For previous frames, fi-frame will
- always be correct. mn10300_analyze_prologue will fix fi->frame if
- it's not valid.
-
- We can be called with the PC in the call dummy under two circumstances.
- First, during normal backtracing, second, while figuring out the frame
- pointer just prior to calling the target function (see run_stack_dummy). */
-
-static void
-mn10300_init_extra_frame_info (int fromleaf, struct frame_info *fi)
-{
- if (get_next_frame (fi))
- deprecated_update_frame_pc_hack (fi, DEPRECATED_FRAME_SAVED_PC (get_next_frame (fi)));
-
- frame_saved_regs_zalloc (fi);
- frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info));
-
- get_frame_extra_info (fi)->status = 0;
- get_frame_extra_info (fi)->stack_size = 0;
-
- mn10300_analyze_prologue (fi, 0);
-}
-
-
-/* This function's job is handled by init_extra_frame_info. */
-static void
-mn10300_frame_init_saved_regs (struct frame_info *frame)
-{
-}
-
-
-/* Function: mn10300_virtual_frame_pointer
- Return the register that the function uses for a frame pointer,
- plus any necessary offset to be applied to the register before
- any frame pointer offsets. */
-
-static void
-mn10300_virtual_frame_pointer (CORE_ADDR pc,
- int *reg,
- LONGEST *offset)
-{
- struct frame_info *dummy = analyze_dummy_frame (pc, 0);
- /* Set up a dummy frame_info, Analyze the prolog and fill in the
- extra info. */
- /* Results will tell us which type of frame it uses. */
- if (get_frame_extra_info (dummy)->status & MY_FRAME_IN_SP)
- {
- *reg = SP_REGNUM;
- *offset = -(get_frame_extra_info (dummy)->stack_size);
- }
- else
- {
- *reg = A3_REGNUM;
- *offset = 0;
- }
-}
-
-static int
-mn10300_reg_struct_has_addr (int gcc_p, struct type *type)
-{
- return (TYPE_LENGTH (type) > 8);
-}
-
-static struct type *
-mn10300_register_virtual_type (int reg)
-{
- return builtin_type_int;
-}
-
-static int
-mn10300_register_byte (int reg)
-{
- return (reg * 4);
-}
-
-static int
-mn10300_register_virtual_size (int reg)
-{
- return 4;
-}
+ /* Push the return address that contains the magic breakpoint. */
+ sp -= 4;
+ write_memory_unsigned_integer (sp, push_size, bp_addr);
+
+ /* The CPU also writes the return address always into the
+ MDR register on "call". */
+ regcache_cooked_write_unsigned (regcache, E_MDR_REGNUM, bp_addr);
+
+ /* Update $sp. */
+ regcache_cooked_write_unsigned (regcache, E_SP_REGNUM, sp);
+
+ /* On the mn10300, it's possible to move some of the stack adjustment
+ and saving of the caller-save registers out of the prologue and
+ into the call sites. (When using gcc, this optimization can
+ occur when using the -mrelax switch.) If this occurs, the dwarf2
+ info will reflect this fact. We can test to see if this is the
+ case by creating a new frame using the current stack pointer and
+ the address of the function that we're about to call. We then
+ unwind SP and see if it's different than the SP of our newly
+ created frame. If the SP values are the same, the caller is not
+ expected to allocate any additional stack. On the other hand, if
+ the SP values are different, the difference determines the
+ additional stack that must be allocated.
+
+ Note that we don't update the return value though because that's
+ the value of the stack just after pushing the arguments, but prior
+ to performing the call. This value is needed in order to
+ construct the frame ID of the dummy call. */
+ {
+ CORE_ADDR func_addr = find_function_addr (target_func, NULL);
+ CORE_ADDR unwound_sp
+ = mn10300_unwind_sp (gdbarch, create_new_frame (sp, func_addr));
+ if (sp != unwound_sp)
+ regcache_cooked_write_unsigned (regcache, E_SP_REGNUM,
+ sp - (unwound_sp - sp));
+ }
-static int
-mn10300_register_raw_size (int reg)
-{
- return 4;
+ return sp;
}
/* If DWARF2 is a register number appearing in Dwarf2 debug info, then
to work with the existing GDB, neither of them can change. So we
just have to cope. */
static int
-mn10300_dwarf2_reg_to_regnum (int dwarf2)
+mn10300_dwarf2_reg_to_regnum (struct gdbarch *gdbarch, int dwarf2)
{
- /* This table is supposed to be shaped like the REGISTER_NAMES
+ /* This table is supposed to be shaped like the gdbarch_register_name
initializer in gcc/config/mn10300/mn10300.h. Registers which
appear in GCC's numbering, but have no counterpart in GDB's
world, are marked with a -1. */
static int dwarf2_to_gdb[] = {
0, 1, 2, 3, 4, 5, 6, 7, -1, 8,
- 15, 16, 17, 18, 19, 20, 21, 22
+ 15, 16, 17, 18, 19, 20, 21, 22,
+ 32, 33, 34, 35, 36, 37, 38, 39,
+ 40, 41, 42, 43, 44, 45, 46, 47,
+ 48, 49, 50, 51, 52, 53, 54, 55,
+ 56, 57, 58, 59, 60, 61, 62, 63,
+ 9
};
- int gdb;
if (dwarf2 < 0
- || dwarf2 >= (sizeof (dwarf2_to_gdb) / sizeof (dwarf2_to_gdb[0]))
- || dwarf2_to_gdb[dwarf2] == -1)
- internal_error (__FILE__, __LINE__,
- "bogus register number in debug info: %d", dwarf2);
-
- return dwarf2_to_gdb[dwarf2];
-}
-
-static void
-mn10300_print_register (const char *name, int regnum, int reg_width)
-{
- char *raw_buffer = alloca (MAX_REGISTER_RAW_SIZE);
-
- if (reg_width)
- printf_filtered ("%*s: ", reg_width, name);
- else
- printf_filtered ("%s: ", name);
-
- /* Get the data */
- if (!frame_register_read (deprecated_selected_frame, regnum, raw_buffer))
+ || dwarf2 >= ARRAY_SIZE (dwarf2_to_gdb))
{
- printf_filtered ("[invalid]");
- return;
+ warning (_("Bogus register number in debug info: %d"), dwarf2);
+ return -1;
}
- else
- {
- int byte;
- if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
- {
- for (byte = REGISTER_RAW_SIZE (regnum) - REGISTER_VIRTUAL_SIZE (regnum);
- byte < REGISTER_RAW_SIZE (regnum);
- byte++)
- printf_filtered ("%02x", (unsigned char) raw_buffer[byte]);
- }
- else
- {
- for (byte = REGISTER_VIRTUAL_SIZE (regnum) - 1;
- byte >= 0;
- byte--)
- printf_filtered ("%02x", (unsigned char) raw_buffer[byte]);
- }
- }
-}
-static void
-mn10300_do_registers_info (int regnum, int fpregs)
-{
- if (regnum >= 0)
- {
- const char *name = REGISTER_NAME (regnum);
- if (name == NULL || name[0] == '\0')
- error ("Not a valid register for the current processor type");
- mn10300_print_register (name, regnum, 0);
- printf_filtered ("\n");
- }
- else
- {
- /* print registers in an array 4x8 */
- int r;
- int reg;
- const int nr_in_row = 4;
- const int reg_width = 4;
- for (r = 0; r < NUM_REGS; r += nr_in_row)
- {
- int c;
- int printing = 0;
- int padding = 0;
- for (c = r; c < r + nr_in_row; c++)
- {
- const char *name = REGISTER_NAME (c);
- if (name != NULL && *name != '\0')
- {
- printing = 1;
- while (padding > 0)
- {
- printf_filtered (" ");
- padding--;
- }
- mn10300_print_register (name, c, reg_width);
- printf_filtered (" ");
- }
- else
- {
- padding += (reg_width + 2 + 8 + 1);
- }
- }
- if (printing)
- printf_filtered ("\n");
- }
- }
-}
-
-/* Dump out the mn10300 speciic architecture information. */
-
-static void
-mn10300_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
- fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n",
- tdep->am33_mode);
+ return dwarf2_to_gdb[dwarf2];
}
static struct gdbarch *
mn10300_gdbarch_init (struct gdbarch_info info,
struct gdbarch_list *arches)
{
- static LONGEST mn10300_call_dummy_words[] = { 0 };
struct gdbarch *gdbarch;
- struct gdbarch_tdep *tdep = NULL;
- int am33_mode;
- gdbarch_register_name_ftype *register_name;
- int mach;
+ struct gdbarch_tdep *tdep;
int num_regs;
arches = gdbarch_list_lookup_by_info (arches, &info);
if (arches != NULL)
return arches->gdbarch;
+
tdep = xmalloc (sizeof (struct gdbarch_tdep));
gdbarch = gdbarch_alloc (&info, tdep);
- if (info.bfd_arch_info != NULL
- && info.bfd_arch_info->arch == bfd_arch_mn10300)
- mach = info.bfd_arch_info->mach;
- else
- mach = 0;
- switch (mach)
+ switch (info.bfd_arch_info->mach)
{
case 0:
case bfd_mach_mn10300:
- am33_mode = 0;
- register_name = mn10300_generic_register_name;
+ set_gdbarch_register_name (gdbarch, mn10300_generic_register_name);
+ tdep->am33_mode = 0;
num_regs = 32;
break;
case bfd_mach_am33:
- am33_mode = 1;
- register_name = am33_register_name;
+ set_gdbarch_register_name (gdbarch, am33_register_name);
+ tdep->am33_mode = 1;
num_regs = 32;
break;
+ case bfd_mach_am33_2:
+ set_gdbarch_register_name (gdbarch, am33_2_register_name);
+ tdep->am33_mode = 2;
+ num_regs = 64;
+ set_gdbarch_fp0_regnum (gdbarch, 32);
+ break;
default:
internal_error (__FILE__, __LINE__,
- "mn10300_gdbarch_init: Unknown mn10300 variant");
- return NULL; /* keep GCC happy. */
+ _("mn10300_gdbarch_init: Unknown mn10300 variant"));
+ break;
}
/* Registers. */
set_gdbarch_num_regs (gdbarch, num_regs);
- set_gdbarch_register_name (gdbarch, register_name);
- set_gdbarch_register_size (gdbarch, 4);
- set_gdbarch_register_bytes (gdbarch,
- num_regs * gdbarch_register_size (gdbarch));
- set_gdbarch_deprecated_max_register_raw_size (gdbarch, 4);
- set_gdbarch_register_raw_size (gdbarch, mn10300_register_raw_size);
- set_gdbarch_register_byte (gdbarch, mn10300_register_byte);
- set_gdbarch_deprecated_max_register_virtual_size (gdbarch, 4);
- set_gdbarch_register_virtual_size (gdbarch, mn10300_register_virtual_size);
- set_gdbarch_register_virtual_type (gdbarch, mn10300_register_virtual_type);
+ set_gdbarch_register_type (gdbarch, mn10300_register_type);
+ set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue);
+ set_gdbarch_read_pc (gdbarch, mn10300_read_pc);
+ set_gdbarch_write_pc (gdbarch, mn10300_write_pc);
+ set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM);
+ set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM);
set_gdbarch_dwarf2_reg_to_regnum (gdbarch, mn10300_dwarf2_reg_to_regnum);
- set_gdbarch_deprecated_do_registers_info (gdbarch, mn10300_do_registers_info);
- set_gdbarch_sp_regnum (gdbarch, 8);
- set_gdbarch_pc_regnum (gdbarch, 9);
- set_gdbarch_fp_regnum (gdbarch, 31);
- set_gdbarch_virtual_frame_pointer (gdbarch, mn10300_virtual_frame_pointer);
+ /* Stack unwinding. */
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
/* Breakpoints. */
set_gdbarch_breakpoint_from_pc (gdbarch, mn10300_breakpoint_from_pc);
- set_gdbarch_function_start_offset (gdbarch, 0);
- set_gdbarch_decr_pc_after_break (gdbarch, 0);
+ /* decr_pc_after_break? */
+ /* Disassembly. */
+ set_gdbarch_print_insn (gdbarch, print_insn_mn10300);
- /* Stack unwinding. */
- set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
- set_gdbarch_saved_pc_after_call (gdbarch, mn10300_saved_pc_after_call);
- set_gdbarch_deprecated_init_extra_frame_info (gdbarch, mn10300_init_extra_frame_info);
- set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_noop);
- set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, mn10300_frame_init_saved_regs);
- set_gdbarch_deprecated_frame_chain (gdbarch, mn10300_frame_chain);
- set_gdbarch_deprecated_frame_saved_pc (gdbarch, mn10300_frame_saved_pc);
- set_gdbarch_deprecated_extract_return_value (gdbarch, mn10300_extract_return_value);
- set_gdbarch_deprecated_extract_struct_value_address
- (gdbarch, mn10300_extract_struct_value_address);
- set_gdbarch_deprecated_store_return_value (gdbarch, mn10300_store_return_value);
- set_gdbarch_deprecated_store_struct_return (gdbarch, mn10300_store_struct_return);
- set_gdbarch_deprecated_pop_frame (gdbarch, mn10300_pop_frame);
- set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue);
- set_gdbarch_frame_args_skip (gdbarch, 0);
- set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
- /* That's right, we're using the stack pointer as our frame pointer. */
- set_gdbarch_read_fp (gdbarch, generic_target_read_sp);
-
- /* Calling functions in the inferior from GDB. */
- set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1);
- set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0);
- set_gdbarch_call_dummy_words (gdbarch, mn10300_call_dummy_words);
- set_gdbarch_sizeof_call_dummy_words (gdbarch,
- sizeof (mn10300_call_dummy_words));
- set_gdbarch_call_dummy_length (gdbarch, 0);
- set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy);
- set_gdbarch_call_dummy_start_offset (gdbarch, 0);
- set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_at_entry_point);
- set_gdbarch_deprecated_push_arguments (gdbarch, mn10300_push_arguments);
- set_gdbarch_reg_struct_has_addr (gdbarch, mn10300_reg_struct_has_addr);
- set_gdbarch_deprecated_push_return_address (gdbarch, mn10300_push_return_address);
- set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos);
- set_gdbarch_use_struct_convention (gdbarch, mn10300_use_struct_convention);
-
- tdep->am33_mode = am33_mode;
-
- /* Should be using push_dummy_call. */
- set_gdbarch_deprecated_dummy_write_sp (gdbarch, generic_target_write_sp);
+ /* Stage 2 */
+ set_gdbarch_return_value (gdbarch, mn10300_return_value);
+
+ /* Stage 3 -- get target calls working. */
+ set_gdbarch_push_dummy_call (gdbarch, mn10300_push_dummy_call);
+ /* set_gdbarch_return_value (store, extract) */
+
+
+ mn10300_frame_unwind_init (gdbarch);
+
+ /* Hook in ABI-specific overrides, if they have been registered. */
+ gdbarch_init_osabi (info, gdbarch);
return gdbarch;
}
+/* Dump out the mn10300 specific architecture information. */
+
+static void
+mn10300_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ fprintf_unfiltered (file, "mn10300_dump_tdep: am33_mode = %d\n",
+ tdep->am33_mode);
+}
+
void
_initialize_mn10300_tdep (void)
{
-/* printf("_initialize_mn10300_tdep\n"); */
-
- tm_print_insn = print_insn_mn10300;
-
- register_gdbarch_init (bfd_arch_mn10300, mn10300_gdbarch_init);
+ gdbarch_register (bfd_arch_mn10300, mn10300_gdbarch_init, mn10300_dump_tdep);
}
+
projects / deliverable / binutils-gdb.git / blobdiff