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Add a signal frame unwinder for FreeBSD/mipsn32. 

The N32 signal frame uses an identical layout to N64, so reuse the N64
handler.  The N32 signal trampoline does use one different instruction
relative to N64, so a separate tramp_frame is required.

gdb/ChangeLog:

	* mips-fbsd-tdep.c (MIPS_INST_ADDIU_A0_SP_N32): Define.
	(mipsn32_fbsd_sigframe): Define.
	(mips_fbsd_init_abi): Install mipsn32_fbsd_sigframe unwinder
	for FreeBSD/mipsn32.
This commit is contained in:
John Baldwin 2017-10-05 09:50:01 -07:00
parent 6d5be5d6b8
commit a80a647180
2 changed files with 25 additions and 0 deletions
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7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
2017-10-05 John Baldwin <jhb@FreeBSD.org>
* mips-fbsd-tdep.c (MIPS_INST_ADDIU_A0_SP_N32): Define.
(mipsn32_fbsd_sigframe): Define.
(mips_fbsd_init_abi): Install mipsn32_fbsd_sigframe unwinder
for FreeBSD/mipsn32.
2017-10-05 John Baldwin <jhb@FreeBSD.org>
* fbsd-tdep.c (fbsd_print_auxv_entry): Handle AT_EHDRFLAGS and

18
gdb/mips-fbsd-tdep.c
View File

@ -426,6 +426,23 @@ mips64_fbsd_sigframe_init (const struct tramp_frame *self,
trad_frame_set_id (cache, frame_id_build (sp, func));
}
#define MIPS_INST_ADDIU_A0_SP_N32 (0x27a40000 \
+ N64_SIGFRAME_UCONTEXT_OFFSET)
static const struct tramp_frame mipsn32_fbsd_sigframe =
{
SIGTRAMP_FRAME,
MIPS_INSN32_SIZE,
{
{ MIPS_INST_ADDIU_A0_SP_N32, -1 }, /* addiu a0, sp, SIGF_UC */
{ MIPS_INST_LI_V0_SIGRETURN, -1 }, /* li v0, SYS_sigreturn */
{ MIPS_INST_SYSCALL, -1 }, /* syscall */
{ MIPS_INST_BREAK, -1 }, /* break */
{ TRAMP_SENTINEL_INSN, -1 }
},
mips64_fbsd_sigframe_init
};
#define MIPS_INST_DADDIU_A0_SP_N64 (0x67a40000 \
+ N64_SIGFRAME_UCONTEXT_OFFSET)
@ -519,6 +536,7 @@ mips_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
tramp_frame_prepend_unwinder (gdbarch, &mips_fbsd_sigframe);
break;
case MIPS_ABI_N32:
tramp_frame_prepend_unwinder (gdbarch, &mipsn32_fbsd_sigframe);
break;
case MIPS_ABI_N64:
tramp_frame_prepend_unwinder (gdbarch, &mips64_fbsd_sigframe);