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Add more debugging output to aarch64_displaced_step_fixup 

While debugging the step-over-syscall problem, i wanted to see a bit more
debugging output to try to determine the root cause.

This patch does this.

gdb/ChangeLog:

2020-01-21  Luis Machado  <luis.machado@linaro.org>

	* aarch64-tdep.c (aarch64_displaced_step_fixup): Add more debugging
	output.
This commit is contained in:
Luis Machado 2020-01-09 16:19:31 -03:00
parent 0c27188999
commit 1ab139e5be
2 changed files with 30 additions and 2 deletions
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5
gdb/ChangeLog
View File

@ -1,3 +1,8 @@
2020-01-21 Luis Machado <luis.machado@linaro.org>
* aarch64-tdep.c (aarch64_displaced_step_fixup): Add more debugging
output.
2020-01-21 Luis Machado <luis.machado@linaro.org>
* aarch64-tdep.c (struct aarch64_displaced_step_closure )

27
gdb/aarch64-tdep.c
View File

@ -3037,8 +3037,16 @@ aarch64_displaced_step_fixup (struct gdbarch *gdbarch,
regcache_cooked_read_unsigned (regs, AARCH64_PC_REGNUM, &pc);
if (debug_displaced)
debug_printf ("Displaced: PC after stepping: %s (was %s).\n",
paddress (gdbarch, pc), paddress (gdbarch, to));
if (dsc->cond)
{
if (debug_displaced)
debug_printf ("Displaced: [Conditional] pc_adjust before: %d\n",
dsc->pc_adjust);
if (pc - to == 8)
{
/* Condition is true. */
@ -3050,8 +3058,18 @@ aarch64_displaced_step_fixup (struct gdbarch *gdbarch,
}
else
gdb_assert_not_reached ("Unexpected PC value after displaced stepping");
if (debug_displaced)
debug_printf ("Displaced: [Conditional] pc_adjust after: %d\n",
dsc->pc_adjust);
}
if (debug_displaced)
debug_printf ("Displaced: %s PC by %d\n",
dsc->pc_adjust? "adjusting" : "not adjusting",
dsc->pc_adjust);
if (dsc->pc_adjust != 0)
{
/* Make sure the previous instruction was executed (that is, the PC
@ -3059,11 +3077,16 @@ aarch64_displaced_step_fixup (struct gdbarch *gdbarch,
offset. Otherwise we may skip an instruction before its execution
took place. */
if ((pc - to) == 0)
dsc->pc_adjust = 0;
{
if (debug_displaced)
debug_printf ("Displaced: PC did not move. Discarding PC "
"adjustment.\n");
dsc->pc_adjust = 0;
}
if (debug_displaced)
{
debug_printf ("displaced: fixup: set PC to %s:%d\n",
debug_printf ("Displaced: fixup: set PC to %s:%d\n",
paddress (gdbarch, from), dsc->pc_adjust);
}
regcache_cooked_write_unsigned (regs, AARCH64_PC_REGNUM,