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author | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
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committer | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
commit | 1bc5aee63eb72b341f506ad058502cd0361f0d10 (patch) | |
tree | c607e8252f3405424ff15bc2d00aa38dadbb2518 /gcc-4.9/libgcc/config/i386/linux-unwind.h | |
parent | 283a0bf58fcf333c58a2a92c3ebbc41fb9eb1fdb (diff) | |
download | toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.gz toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.bz2 toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.zip |
Initial checkin of GCC 4.9.0 from trunk (r208799).
Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba
Diffstat (limited to 'gcc-4.9/libgcc/config/i386/linux-unwind.h')
-rw-r--r-- | gcc-4.9/libgcc/config/i386/linux-unwind.h | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/gcc-4.9/libgcc/config/i386/linux-unwind.h b/gcc-4.9/libgcc/config/i386/linux-unwind.h new file mode 100644 index 000000000..7986928cf --- /dev/null +++ b/gcc-4.9/libgcc/config/i386/linux-unwind.h @@ -0,0 +1,198 @@ +/* DWARF2 EH unwinding support for AMD x86-64 and x86. + Copyright (C) 2004-2014 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 3, or (at your option) +any later version. + +GCC is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +Under Section 7 of GPL version 3, you are granted additional +permissions described in the GCC Runtime Library Exception, version +3.1, as published by the Free Software Foundation. + +You should have received a copy of the GNU General Public License and +a copy of the GCC Runtime Library Exception along with this program; +see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +<http://www.gnu.org/licenses/>. */ + +/* Do code reading to identify a signal frame, and set the frame + state data appropriately. See unwind-dw2.c for the structs. + Don't use this at all if inhibit_libc is used. */ + +#ifndef inhibit_libc + +/* There's no sys/ucontext.h for glibc 2.0, so no + signal-turned-exceptions for them. There's also no configure-run for + the target, so we can't check on (e.g.) HAVE_SYS_UCONTEXT_H. Using the + target libc version macro should be enough. */ +#if defined __GLIBC__ && !(__GLIBC__ == 2 && __GLIBC_MINOR__ == 0) + +#include <signal.h> +#include <sys/ucontext.h> + +#ifdef __x86_64__ + +#define MD_FALLBACK_FRAME_STATE_FOR x86_64_fallback_frame_state + +static _Unwind_Reason_Code +x86_64_fallback_frame_state (struct _Unwind_Context *context, + _Unwind_FrameState *fs) +{ + unsigned char *pc = context->ra; + struct sigcontext *sc; + long new_cfa; + + /* movq $__NR_rt_sigreturn, %rax ; syscall. */ +#ifdef __LP64__ +#define RT_SIGRETURN_SYSCALL 0x050f0000000fc0c7ULL +#else +#define RT_SIGRETURN_SYSCALL 0x050f40000201c0c7ULL +#endif + if (*(unsigned char *)(pc+0) == 0x48 + && *(unsigned long long *)(pc+1) == RT_SIGRETURN_SYSCALL) + { + struct ucontext *uc_ = context->cfa; + /* The void * cast is necessary to avoid an aliasing warning. + The aliasing warning is correct, but should not be a problem + because it does not alias anything. */ + sc = (struct sigcontext *) (void *) &uc_->uc_mcontext; + } + else + return _URC_END_OF_STACK; + + new_cfa = sc->rsp; + fs->regs.cfa_how = CFA_REG_OFFSET; + /* Register 7 is rsp */ + fs->regs.cfa_reg = 7; + fs->regs.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->rax - new_cfa; + fs->regs.reg[1].how = REG_SAVED_OFFSET; + fs->regs.reg[1].loc.offset = (long)&sc->rdx - new_cfa; + fs->regs.reg[2].how = REG_SAVED_OFFSET; + fs->regs.reg[2].loc.offset = (long)&sc->rcx - new_cfa; + fs->regs.reg[3].how = REG_SAVED_OFFSET; + fs->regs.reg[3].loc.offset = (long)&sc->rbx - new_cfa; + fs->regs.reg[4].how = REG_SAVED_OFFSET; + fs->regs.reg[4].loc.offset = (long)&sc->rsi - new_cfa; + fs->regs.reg[5].how = REG_SAVED_OFFSET; + fs->regs.reg[5].loc.offset = (long)&sc->rdi - new_cfa; + fs->regs.reg[6].how = REG_SAVED_OFFSET; + fs->regs.reg[6].loc.offset = (long)&sc->rbp - new_cfa; + fs->regs.reg[8].how = REG_SAVED_OFFSET; + fs->regs.reg[8].loc.offset = (long)&sc->r8 - new_cfa; + fs->regs.reg[9].how = REG_SAVED_OFFSET; + fs->regs.reg[9].loc.offset = (long)&sc->r9 - new_cfa; + fs->regs.reg[10].how = REG_SAVED_OFFSET; + fs->regs.reg[10].loc.offset = (long)&sc->r10 - new_cfa; + fs->regs.reg[11].how = REG_SAVED_OFFSET; + fs->regs.reg[11].loc.offset = (long)&sc->r11 - new_cfa; + fs->regs.reg[12].how = REG_SAVED_OFFSET; + fs->regs.reg[12].loc.offset = (long)&sc->r12 - new_cfa; + fs->regs.reg[13].how = REG_SAVED_OFFSET; + fs->regs.reg[13].loc.offset = (long)&sc->r13 - new_cfa; + fs->regs.reg[14].how = REG_SAVED_OFFSET; + fs->regs.reg[14].loc.offset = (long)&sc->r14 - new_cfa; + fs->regs.reg[15].how = REG_SAVED_OFFSET; + fs->regs.reg[15].loc.offset = (long)&sc->r15 - new_cfa; + fs->regs.reg[16].how = REG_SAVED_OFFSET; + fs->regs.reg[16].loc.offset = (long)&sc->rip - new_cfa; + fs->retaddr_column = 16; + fs->signal_frame = 1; + return _URC_NO_REASON; +} + +#else /* ifdef __x86_64__ */ + +#define MD_FALLBACK_FRAME_STATE_FOR x86_fallback_frame_state + +static _Unwind_Reason_Code +x86_fallback_frame_state (struct _Unwind_Context *context, + _Unwind_FrameState *fs) +{ + 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; + siginfo_t *pinfo; + void *puc; + siginfo_t info; + struct ucontext uc; + } *rt_ = context->cfa; + /* The void * cast is necessary to avoid an aliasing warning. + The aliasing warning is correct, but should not be a problem + because it does not alias anything. */ + sc = (struct sigcontext *) (void *) &rt_->uc.uc_mcontext; + } + else + return _URC_END_OF_STACK; + + new_cfa = sc->esp; + fs->regs.cfa_how = CFA_REG_OFFSET; + fs->regs.cfa_reg = 4; + fs->regs.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; + fs->signal_frame = 1; + return _URC_NO_REASON; +} + +#define MD_FROB_UPDATE_CONTEXT x86_frob_update_context + +/* Fix up for kernels that have vDSO, but don't have S flag in it. */ + +static void +x86_frob_update_context (struct _Unwind_Context *context, + _Unwind_FrameState *fs ATTRIBUTE_UNUSED) +{ + unsigned char *pc = context->ra; + + /* movl $__NR_rt_sigreturn,%eax ; {int $0x80 | syscall} */ + if (*(unsigned char *)(pc+0) == 0xb8 + && *(unsigned int *)(pc+1) == 173 + && (*(unsigned short *)(pc+5) == 0x80cd + || *(unsigned short *)(pc+5) == 0x050f)) + _Unwind_SetSignalFrame (context, 1); +} + +#endif /* ifdef __x86_64__ */ +#endif /* not glibc 2.0 */ +#endif /* ifdef inhibit_libc */ |