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MD_FALLBACK_FRAME_STATE_FOR
- From: Bo Thorsen <bo at sonofthor dot dk>
- To: gcc at gcc dot gnu dot org, discuss at x86-64 dot org
- Date: Mon, 8 Apr 2002 11:41:05 +0200
- Subject: MD_FALLBACK_FRAME_STATE_FOR
- Organization: SuSE Labs
This macro is in gcc/config/i386/linux.h:
#define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS) \
do { \
unsigned char *pc_ = (CONTEXT)->ra; \
struct sigcontext *sc_; \
long new_cfa_; \
\
/* popl %eax ; movl $__NR_sigreturn,%eax ; int $0x80 */ \
if (*(unsigned short *)(pc_+0) == 0xb858 \
&& *(unsigned int *)(pc_+2) == 119 \
&& *(unsigned short *)(pc_+6) == 0x80cd) \
sc_ = (CONTEXT)->cfa + 4; \
/* movl $__NR_rt_sigreturn,%eax ; int $0x80 */ \
else if (*(unsigned char *)(pc_+0) == 0xb8 \
&& *(unsigned int *)(pc_+1) == 173 \
&& *(unsigned short *)(pc_+5) == 0x80cd) \
{ \
struct rt_sigframe { \
int sig; \
struct siginfo *pinfo; \
void *puc; \
struct siginfo info; \
struct ucontext uc; \
} *rt_ = (CONTEXT)->cfa; \
sc_ = (struct sigcontext *) &rt_->uc.uc_mcontext; \
} \
else \
break; \
\
new_cfa_ = sc_->esp; \
(FS)->cfa_how = CFA_REG_OFFSET; \
(FS)->cfa_reg = 4; \
(FS)->cfa_offset = new_cfa_ - (long) (CONTEXT)->cfa; \
\
/* The SVR4 register numbering macros aren't usable in libgcc. */ \
(FS)->regs.reg[0].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[0].loc.offset = (long)&sc_->eax - new_cfa_; \
(FS)->regs.reg[3].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[3].loc.offset = (long)&sc_->ebx - new_cfa_; \
(FS)->regs.reg[1].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[1].loc.offset = (long)&sc_->ecx - new_cfa_; \
(FS)->regs.reg[2].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[2].loc.offset = (long)&sc_->edx - new_cfa_; \
(FS)->regs.reg[6].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[6].loc.offset = (long)&sc_->esi - new_cfa_; \
(FS)->regs.reg[7].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[7].loc.offset = (long)&sc_->edi - new_cfa_; \
(FS)->regs.reg[5].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[5].loc.offset = (long)&sc_->ebp - new_cfa_; \
(FS)->regs.reg[8].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[8].loc.offset = (long)&sc_->eip - new_cfa_; \
(FS)->retaddr_column = 8; \
goto SUCCESS; \
} while (0)
I need this ported for x86-64 and am almost done with it, but I have one
problem left. How do I figure out the ordering of the registers at the end? I
can't see where it is defined.
Bo.
--
Bo Thorsen | Praestevejen 4
Free software developer | 5290 Marslev
SuSE Labs | Denmark