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hurd: libgcc unwinding over signal trampolines with SIGINFO

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When the application sets SA_SIGINFO, the signal trampoline parameters
are different to follow POSIX.

	libgcc/
	* config/i386/gnu-unwind.h (x86_gnu_fallback_frame_state): Add the
	posix siginfo case to struct handler_args. Detect between legacy
	and siginfo from the second parameter, which is a small sigcode in
	the legacy case, and a pointer in the siginfo case.
This commit is contained in:
Samuel Thibault 2020-12-21 15:36:30 +01:00 committed by Thomas Schwinge
parent b1d1e2b54c
commit 2b356e689c
1 changed files with 47 additions and 13 deletions
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60
libgcc/config/i386/gnu-unwind.h
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@ -38,10 +38,21 @@ x86_gnu_fallback_frame_state
{
struct handler_args {
int signo;
int sigcode;
struct sigcontext *scp;
union
{
struct
{
long int sigcode;
struct sigcontext *scp;
} legacy;
struct
{
siginfo_t *siginfop;
ucontext_t *uctxp;
} posix;
};
} *handler_args;
struct sigcontext *scp;
long int sigcode;
unsigned long usp;
/*
@ -75,29 +86,52 @@ x86_gnu_fallback_frame_state
return _URC_END_OF_STACK;
handler_args = context->cfa;
scp = handler_args->scp;
usp = scp->sc_uesp;
sigcode = handler_args->legacy.sigcode;
if (sigcode >= -16 && sigcode < 4096)
{
/* This cannot be a SIGINFO pointer, assume legacy. */
struct sigcontext *scp = handler_args->legacy.scp;
usp = scp->sc_uesp;
fs->regs.reg[0].loc.offset = (unsigned long)&scp->sc_eax - usp;
fs->regs.reg[1].loc.offset = (unsigned long)&scp->sc_ecx - usp;
fs->regs.reg[2].loc.offset = (unsigned long)&scp->sc_edx - usp;
fs->regs.reg[3].loc.offset = (unsigned long)&scp->sc_ebx - usp;
fs->regs.reg[5].loc.offset = (unsigned long)&scp->sc_ebp - usp;
fs->regs.reg[6].loc.offset = (unsigned long)&scp->sc_esi - usp;
fs->regs.reg[7].loc.offset = (unsigned long)&scp->sc_edi - usp;
fs->regs.reg[8].loc.offset = (unsigned long)&scp->sc_eip - usp;
}
else
{
/* This is not a valid sigcode, assume SIGINFO. */
ucontext_t *uctxp = handler_args->posix.uctxp;
gregset_t *gregset = &uctxp->uc_mcontext.gregs;
usp = (*gregset)[REG_UESP];
fs->regs.reg[0].loc.offset = (unsigned long)&(*gregset)[REG_EAX] - usp;
fs->regs.reg[1].loc.offset = (unsigned long)&(*gregset)[REG_ECX] - usp;
fs->regs.reg[2].loc.offset = (unsigned long)&(*gregset)[REG_EDX] - usp;
fs->regs.reg[3].loc.offset = (unsigned long)&(*gregset)[REG_EBX] - usp;
fs->regs.reg[5].loc.offset = (unsigned long)&(*gregset)[REG_EBP] - usp;
fs->regs.reg[6].loc.offset = (unsigned long)&(*gregset)[REG_ESI] - usp;
fs->regs.reg[7].loc.offset = (unsigned long)&(*gregset)[REG_EDI] - usp;
fs->regs.reg[8].loc.offset = (unsigned long)&(*gregset)[REG_EIP] - usp;
}
fs->regs.cfa_how = CFA_REG_OFFSET;
fs->regs.cfa_reg = 4;
fs->regs.cfa_offset = usp - (unsigned long) context->cfa;
fs->regs.reg[0].how = REG_SAVED_OFFSET;
fs->regs.reg[0].loc.offset = (unsigned long)&scp->sc_eax - usp;
fs->regs.reg[1].how = REG_SAVED_OFFSET;
fs->regs.reg[1].loc.offset = (unsigned long)&scp->sc_ecx - usp;
fs->regs.reg[2].how = REG_SAVED_OFFSET;
fs->regs.reg[2].loc.offset = (unsigned long)&scp->sc_edx - usp;
fs->regs.reg[3].how = REG_SAVED_OFFSET;
fs->regs.reg[3].loc.offset = (unsigned long)&scp->sc_ebx - usp;
fs->regs.reg[5].how = REG_SAVED_OFFSET;
fs->regs.reg[5].loc.offset = (unsigned long)&scp->sc_ebp - usp;
fs->regs.reg[6].how = REG_SAVED_OFFSET;
fs->regs.reg[6].loc.offset = (unsigned long)&scp->sc_esi - usp;
fs->regs.reg[7].how = REG_SAVED_OFFSET;
fs->regs.reg[7].loc.offset = (unsigned long)&scp->sc_edi - usp;
fs->regs.reg[8].how = REG_SAVED_OFFSET;
fs->regs.reg[8].loc.offset = (unsigned long)&scp->sc_eip - usp;
fs->retaddr_column = 8;
fs->signal_frame = 1;