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gdb/arm-linux-tdep.c: Handle Thumb2 signal trampolines 

Recent versions of glibc have assembled the signal trampoline code
as Thumb2, which causes gdb to misinterpret them and a number of
testsuite tests to fail. Educate gdb about these trampolines and
get the tests running again.

gdb/ChangeLog:

2014-07-28  Will Newton  <will.newton@linaro.org>

	* arm-linux-tdep.c (THUMB2_SET_R7_SIGRETURN1): New define.
	(THUMB2_SET_R7_SIGRETURN2): Likewise.
	(THUMB2_SET_R7_RT_SIGRETURN1): Likewise.
	(THUMB2_SET_R7_RT_SIGRETURN2): Likewise.
	(THUMB2_EABI_SYSCALL): Likewise.
	(thumb2_eabi_linux_sigreturn_tramp_frame): Create new
	struct tramp_frame.
	(thumb2_eabi_linux_rt_sigreturn_tramp_frame): Likewise.
	(arm_linux_init_abi): Add Thumb2 tramp frame unwinders.
This commit is contained in:
Will Newton 2014-07-22 17:10:51 +01:00
parent fdb1adc685
commit f347ffc90a
2 changed files with 47 additions and 0 deletions
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12
gdb/ChangeLog
View File

@ -1,3 +1,15 @@
2014-07-28 Will Newton <will.newton@linaro.org>
* arm-linux-tdep.c (THUMB2_SET_R7_SIGRETURN1): New define.
(THUMB2_SET_R7_SIGRETURN2): Likewise.
(THUMB2_SET_R7_RT_SIGRETURN1): Likewise.
(THUMB2_SET_R7_RT_SIGRETURN2): Likewise.
(THUMB2_EABI_SYSCALL): Likewise.
(thumb2_eabi_linux_sigreturn_tramp_frame): Create new
struct tramp_frame.
(thumb2_eabi_linux_rt_sigreturn_tramp_frame): Likewise.
(arm_linux_init_abi): Add Thumb2 tramp frame unwinders.
2014-07-27 Doug Evans <xdje42@gmail.com>
* guile/scm-param.c (pascm_print_param_smob): Fix output.

35
gdb/arm-linux-tdep.c
View File

@ -246,6 +246,13 @@ static const gdb_byte arm_linux_thumb2_le_breakpoint[] = { 0xf0, 0xf7, 0x00, 0xa
#define ARM_SET_R7_RT_SIGRETURN 0xe3a070ad
#define ARM_EABI_SYSCALL 0xef000000
/* Equivalent patterns for Thumb2. */
#define THUMB2_SET_R7_SIGRETURN1 0xf04f
#define THUMB2_SET_R7_SIGRETURN2 0x0777
#define THUMB2_SET_R7_RT_SIGRETURN1 0xf04f
#define THUMB2_SET_R7_RT_SIGRETURN2 0x07ad
#define THUMB2_EABI_SYSCALL 0xdf00
/* OABI syscall restart trampoline, used for EABI executables too
whenever OABI support has been enabled in the kernel. */
#define ARM_OABI_SYSCALL_RESTART_SYSCALL 0xef900000
@ -444,6 +451,30 @@ static struct tramp_frame arm_eabi_linux_rt_sigreturn_tramp_frame = {
arm_linux_rt_sigreturn_init
};
static struct tramp_frame thumb2_eabi_linux_sigreturn_tramp_frame = {
SIGTRAMP_FRAME,
2,
{
{ THUMB2_SET_R7_SIGRETURN1, -1 },
{ THUMB2_SET_R7_SIGRETURN2, -1 },
{ THUMB2_EABI_SYSCALL, -1 },
{ TRAMP_SENTINEL_INSN }
},
arm_linux_sigreturn_init
};
static struct tramp_frame thumb2_eabi_linux_rt_sigreturn_tramp_frame = {
SIGTRAMP_FRAME,
2,
{
{ THUMB2_SET_R7_RT_SIGRETURN1, -1 },
{ THUMB2_SET_R7_RT_SIGRETURN2, -1 },
{ THUMB2_EABI_SYSCALL, -1 },
{ TRAMP_SENTINEL_INSN }
},
arm_linux_rt_sigreturn_init
};
static struct tramp_frame arm_linux_restart_syscall_tramp_frame = {
NORMAL_FRAME,
4,
@ -1415,6 +1446,10 @@ arm_linux_init_abi (struct gdbarch_info info,
&arm_eabi_linux_sigreturn_tramp_frame);
tramp_frame_prepend_unwinder (gdbarch,
&arm_eabi_linux_rt_sigreturn_tramp_frame);
tramp_frame_prepend_unwinder (gdbarch,
&thumb2_eabi_linux_sigreturn_tramp_frame);
tramp_frame_prepend_unwinder (gdbarch,
&thumb2_eabi_linux_rt_sigreturn_tramp_frame);
tramp_frame_prepend_unwinder (gdbarch,
&arm_linux_restart_syscall_tramp_frame);
tramp_frame_prepend_unwinder (gdbarch,