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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
gdb/ChangeLog
View File

@ -1,3 +1,24 @@
2002-02-15 Richard Earnshaw <rearnsha@arm.com>
* arm-tdep.h (struct gdbarch_tdep): Add fields for breakpoint
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.
2002-02-15 Richard Earnshaw <rearnsha@arm.com>
* arm-tdep.h (enum arm_abi): New enum.

11
gdb/arm-linux-tdep.c
View File

@ -35,6 +35,15 @@
#include "symfile.h"
#include "objfiles.h"
/* Under ARM Linux the traditional way of performing a breakpoint is to
execute a particular software interrupt, rather than use a particular
undefined instruction to provoke a trap. Upon exection of the software
interrupt the kernel stops the inferior with a SIGTRAP, and wakes the
debugger. Since ARM Linux is little endian, and doesn't support Thumb
at the moment we only override the ARM little-endian breakpoint. */
static const char arm_linux_arm_le_breakpoint[] = {0x01,0x00,0x9f,0xef};
/* CALL_DUMMY_WORDS:
This sequence of words is the instructions
@ -537,6 +546,8 @@ arm_linux_init_abi (struct gdbarch_info info,
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
tdep->lowest_pc = 0x8000;
tdep->arm_breakpoint = arm_linux_arm_le_breakpoint;
tdep->arm_breakpoint_size = sizeof (arm_linux_arm_le_breakpoint);
}
void

97
gdb/arm-tdep.c
View File

@ -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:

4
gdb/arm-tdep.h
View File

@ -123,6 +123,10 @@ struct gdbarch_tdep
const char *abi_name; /* Name of the above. */
CORE_ADDR lowest_pc; /* Lowest address at which instructions
will appear. */
const char *arm_breakpoint;
int arm_breakpoint_size;
const char *thumb_breakpoint;
int thumb_breakpoint_size;
};
#ifndef LOWEST_PC

59
gdb/armnbsd-tdep.c Normal file
View File

@ -0,0 +1,59 @@
/* Target-specific functions for ARM running under NetBSD.
Copyright 2002 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
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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. */
#include "defs.h"
#include "arm-tdep.h"
/* For compatibility with previous implemenations of GDB on arm/NetBSD,
override the default little-endian breakpoint. */
static const char arm_nbsd_arm_le_breakpoint[] = {0x11, 0x00, 0x00, 0xe6};
static void
arm_netbsd_init_abi_common (struct gdbarch_info info,
struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
tdep->lowest_pc = 0x8000;
tdep->arm_breakpoint = arm_nbsd_arm_le_breakpoint;
tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_le_breakpoint);
}
static void
arm_netbsd_aout_init_abi (struct gdbarch_info info,
struct gdbarch *gdbarch)
{
arm_netbsd_init_abi_common (info, gdbarch);
}
static void
arm_netbsd_elf_init_abi (struct gdbarch_info info,
struct gdbarch *gdbarch)
{
arm_netbsd_init_abi_common (info, gdbarch);
}
void
_initialize_arm_netbsd_tdep (void)
{
arm_gdbarch_register_os_abi (ARM_ABI_NETBSD_AOUT, arm_netbsd_aout_init_abi);
arm_gdbarch_register_os_abi (ARM_ABI_NETBSD_ELF, arm_netbsd_elf_init_abi);
}

35
gdb/config/arm/tm-arm.h
View File

@ -26,41 +26,6 @@
#define GDB_MULTI_ARCH 1
#endif
/* 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. ARM Linux, RISC iX,
and NetBSD will all use a software interrupt rather than an
undefined instruction to force a trap. This can be handled by
redefining some or all of the following in a target dependent
fashion. */
#define ARM_LE_BREAKPOINT {0xFE,0xDE,0xFF,0xE7}
#define ARM_BE_BREAKPOINT {0xE7,0xFF,0xDE,0xFE}
#define THUMB_LE_BREAKPOINT {0xfe,0xdf}
#define THUMB_BE_BREAKPOINT {0xdf,0xfe}
/* Specify that for the native compiler variables for a particular
lexical context are listed after the beginning LBRAC instead of
before in the executables list of symbols. */

10
gdb/config/arm/tm-linux.h
View File

@ -34,16 +34,6 @@
extern struct link_map_offsets *arm_linux_svr4_fetch_link_map_offsets (void);
#define SVR4_FETCH_LINK_MAP_OFFSETS() arm_linux_svr4_fetch_link_map_offsets ()
/* Under ARM Linux the traditional way of performing a breakpoint is to
execute a particular software interrupt, rather than use a particular
undefined instruction to provoke a trap. Upon exection of the software
interrupt the kernel stops the inferior with a SIGTRAP, and wakes the
debugger. Since ARM Linux is little endian, and doesn't support Thumb
at the moment we redefined ARM_LE_BREAKPOINT to use the correct software
interrupt. */
#undef ARM_LE_BREAKPOINT
#define ARM_LE_BREAKPOINT {0x01,0x00,0x9f,0xef}
#undef CALL_DUMMY_WORDS
#define CALL_DUMMY_WORDS arm_linux_call_dummy_words
extern LONGEST arm_linux_call_dummy_words[];

5
gdb/config/arm/tm-nbsd.h
View File

@ -42,11 +42,6 @@ get_longjmp_target (CORE_ADDR *);
#define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)
/* For compatibility with previous implemenations of GDB on arm/NetBSD,
override the default little-endian breakpoint. */
#undef ARM_LE_BREAKPOINT
#define ARM_LE_BREAKPOINT {0x11, 0x00, 0x00, 0xe6}
/* By convention, NetBSD uses the "other" register names. */
#define DEFAULT_REGISTER_NAMES additional_register_names