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* linux-arm-low.c (thumb_breakpoint, thumb_breakpoint_len): New.

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(arm_breakpoint_at): Handle Thumb.
	(the_low_target): Add comment.
This commit is contained in:
Daniel Jacobowitz 2008-06-04 19:51:51 +00:00
parent 83bd74026c
commit aeb75bf598
2 changed files with 37 additions and 9 deletions
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6
gdb/gdbserver/ChangeLog
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@ -1,3 +1,9 @@
2008-06-04 Daniel Jacobowitz <dan@codesourcery.com>
* linux-arm-low.c (thumb_breakpoint, thumb_breakpoint_len): New.
(arm_breakpoint_at): Handle Thumb.
(the_low_target): Add comment.
2008-05-29 Ulrich Weigand <uweigand@de.ibm.com>
* linux-ppc-low.c (ppc_collect_ptrace_register): Clear buffer.

40
gdb/gdbserver/linux-arm-low.c
View file

@ -136,9 +136,11 @@ arm_set_pc (CORE_ADDR pc)
supply_register_by_name ("pc", &newpc);
}
/* Correct in either endianness. We do not support Thumb yet. */
/* Correct in either endianness. */
static const unsigned long arm_breakpoint = 0xef9f0001;
#define arm_breakpoint_len 4
static const unsigned short thumb_breakpoint = 0xde01;
#define thumb_breakpoint_len 2
/* For new EABI binaries. We recognize it regardless of which ABI
is used for gdbserver, so single threaded debugging should work
@ -149,17 +151,31 @@ static const unsigned long arm_eabi_breakpoint = 0xe7f001f0;
static int
arm_breakpoint_at (CORE_ADDR where)
{
unsigned long insn;
unsigned long cpsr;
(*the_target->read_memory) (where, (unsigned char *) &insn, 4);
if (insn == arm_breakpoint)
return 1;
collect_register_by_name ("cpsr", &cpsr);
if (insn == arm_eabi_breakpoint)
return 1;
if (cpsr & 0x20)
{
/* Thumb mode. */
unsigned short insn;
/* If necessary, recognize more trap instructions here. GDB only uses the
two. */
(*the_target->read_memory) (where, (unsigned char *) &insn, 2);
if (insn == thumb_breakpoint)
return 1;
}
else
{
/* ARM mode. */
unsigned long insn;
(*the_target->read_memory) (where, (unsigned char *) &insn, 4);
if (insn == arm_breakpoint)
return 1;
if (insn == arm_eabi_breakpoint)
return 1;
}
return 0;
}
@ -216,6 +232,12 @@ struct linux_target_ops the_low_target = {
arm_cannot_store_register,
arm_get_pc,
arm_set_pc,
/* Define an ARM-mode breakpoint; we only set breakpoints in the C
library, which is most likely to be ARM. If the kernel supports
clone events, we will never insert a breakpoint, so even a Thumb
C library will work; so will mixing EABI/non-EABI gdbserver and
application. */
#ifndef __ARM_EABI__
(const unsigned char *) &arm_breakpoint,
#else