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* arm-tdep.h (struct gdbarch_tdep): Add fields for breakpoint

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descriptions.
* arm-tdep.c (arm_default_arm_le_breakpoint)
(arm_default_arm_be_breakpoint, arm_default_thumb_le_breakpoint)
(arm_default_thumb_be_breakpoint): New.  Initialize them from
traditional breakpoint defines.
(arm_breakpoint_from_pc): Use new gdbarch_tdep entries.
(arm_gdbarch_init): Initialize new breakpoint variables.
* arm-linux-tdep.c (arm_linux_arm_le_breakpoint): New.
(arm_linux_init_abi): Initialize linux-specific breakpoint.
* armnbsd-tdep.c (arm_nbsd_arm_le_breakpoint): New.
(arm_netbsd_aout_init_abi, arm_netbsd_elf_init_abi): Split common
code out to ...
(arm_netbsd_init_abi_common): ... here; new function.
* config/arm/tm-arm.h (ARM_LE_BREAKPOINT, ARM_BE_BREAKPOINT)
(THUMB_LE_BREAKPOINT, THUMB_BE_BREAKPOINT): Delete.
* config/arm/tm-linux.h (ARM_LE_BREAKPOINT): Delete.
* config/arm/tm-nbsd.h (ARM_LE_BREAKPOINT): Delete.
This commit is contained in:
Richard Earnshaw
2002-02-15 16:12:24 +00:00
parent 97e03143bb
commit 66e810cd09
8 changed files with 165 additions and 77 deletions
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97
gdb/arm-tdep.c
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@@ -2044,6 +2044,56 @@ gdb_print_insn_arm (bfd_vma memaddr, disassemble_info *info)
return print_insn_little_arm (memaddr, info);
}
/* The following define instruction sequences that will cause ARM
cpu's to take an undefined instruction trap. These are used to
signal a breakpoint to GDB.
The newer ARMv4T cpu's are capable of operating in ARM or Thumb
modes. A different instruction is required for each mode. The ARM
cpu's can also be big or little endian. Thus four different
instructions are needed to support all cases.
Note: ARMv4 defines several new instructions that will take the
undefined instruction trap. ARM7TDMI is nominally ARMv4T, but does
not in fact add the new instructions. The new undefined
instructions in ARMv4 are all instructions that had no defined
behaviour in earlier chips. There is no guarantee that they will
raise an exception, but may be treated as NOP's. In practice, it
may only safe to rely on instructions matching:
3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
C C C C 0 1 1 x x x x x x x x x x x x x x x x x x x x 1 x x x x
Even this may only true if the condition predicate is true. The
following use a condition predicate of ALWAYS so it is always TRUE.
There are other ways of forcing a breakpoint. GNU/Linux, RISC iX,
and NetBSD all use a software interrupt rather than an undefined
instruction to force a trap. This can be handled by by the
abi-specific code during establishment of the gdbarch vector. */
/* XXX for now we allow a non-multi-arch gdb to override these
definitions. */
#ifndef ARM_LE_BREAKPOINT
#define ARM_LE_BREAKPOINT {0xFE,0xDE,0xFF,0xE7}
#endif
#ifndef ARM_BE_BREAKPOINT
#define ARM_BE_BREAKPOINT {0xE7,0xFF,0xDE,0xFE}
#endif
#ifndef THUMB_LE_BREAKPOINT
#define THUMB_LE_BREAKPOINT {0xfe,0xdf}
#endif
#ifndef THUMB_BE_BREAKPOINT
#define THUMB_BE_BREAKPOINT {0xdf,0xfe}
#endif
static const char arm_default_arm_le_breakpoint[] = ARM_LE_BREAKPOINT;
static const char arm_default_arm_be_breakpoint[] = ARM_BE_BREAKPOINT;
static const char arm_default_thumb_le_breakpoint[] = THUMB_LE_BREAKPOINT;
static const char arm_default_thumb_be_breakpoint[] = THUMB_BE_BREAKPOINT;
/* Determine the type and size of breakpoint to insert at PCPTR. Uses
the program counter value to determine whether a 16-bit or 32-bit
breakpoint should be used. It returns a pointer to a string of
@@ -2060,37 +2110,18 @@ gdb_print_insn_arm (bfd_vma memaddr, disassemble_info *info)
unsigned char *
arm_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
if (arm_pc_is_thumb (*pcptr) || arm_pc_is_thumb_dummy (*pcptr))
{
if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
{
static char thumb_breakpoint[] = THUMB_BE_BREAKPOINT;
*pcptr = UNMAKE_THUMB_ADDR (*pcptr);
*lenptr = sizeof (thumb_breakpoint);
return thumb_breakpoint;
}
else
{
static char thumb_breakpoint[] = THUMB_LE_BREAKPOINT;
*pcptr = UNMAKE_THUMB_ADDR (*pcptr);
*lenptr = sizeof (thumb_breakpoint);
return thumb_breakpoint;
}
*pcptr = UNMAKE_THUMB_ADDR (*pcptr);
*lenptr = tdep->thumb_breakpoint_size;
return tdep->thumb_breakpoint;
}
else
{
if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
{
static char arm_breakpoint[] = ARM_BE_BREAKPOINT;
*lenptr = sizeof (arm_breakpoint);
return arm_breakpoint;
}
else
{
static char arm_breakpoint[] = ARM_LE_BREAKPOINT;
*lenptr = sizeof (arm_breakpoint);
return arm_breakpoint;
}
*lenptr = tdep->arm_breakpoint_size;
return tdep->arm_breakpoint;
}
}
@@ -2710,21 +2741,33 @@ arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
tdep->abi_name = "<invalid>";
}
/* Floating point sizes and format. */
/* Breakpoints and floating point sizes and format. */
switch (info.byte_order)
{
case BFD_ENDIAN_BIG:
tdep->arm_breakpoint = arm_default_arm_be_breakpoint;
tdep->arm_breakpoint_size = sizeof (arm_default_arm_be_breakpoint);
tdep->thumb_breakpoint = arm_default_thumb_be_breakpoint;
tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_be_breakpoint);
set_gdbarch_float_format (gdbarch, &floatformat_ieee_single_big);
set_gdbarch_double_format (gdbarch, &floatformat_ieee_double_big);
set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big);
break;
case BFD_ENDIAN_LITTLE:
tdep->arm_breakpoint = arm_default_arm_le_breakpoint;
tdep->arm_breakpoint_size = sizeof (arm_default_arm_le_breakpoint);
tdep->thumb_breakpoint = arm_default_thumb_le_breakpoint;
tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_le_breakpoint);
set_gdbarch_float_format (gdbarch, &floatformat_ieee_single_little);
set_gdbarch_double_format (gdbarch,
&floatformat_ieee_double_littlebyte_bigword);
set_gdbarch_long_double_format (gdbarch,
&floatformat_ieee_double_littlebyte_bigword);
break;
default: