diff options
Diffstat (limited to 'libgcc/config/i386/dragonfly-unwind.h')
| -rw-r--r-- | libgcc/config/i386/dragonfly-unwind.h | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/libgcc/config/i386/dragonfly-unwind.h b/libgcc/config/i386/dragonfly-unwind.h new file mode 100644 index 00000000000..cfea5e313e7 --- /dev/null +++ b/libgcc/config/i386/dragonfly-unwind.h @@ -0,0 +1,180 @@ +/* DWARF2 EH unwinding support for DragonFly BSD: AMD x86-64 and x86. + Copyright (C) 2014 Free Software Foundation, Inc. + Contributed by John Marino <gnugcc@marino.st> + +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. */ + +#include <sys/types.h> +#include <sys/sysctl.h> +#include <signal.h> +#include <sys/ucontext.h> +#include <machine/sigframe.h> + + +#define REG_NAME(reg) sf_uc.uc_mcontext.mc_## reg + +#ifdef __x86_64__ +#define MD_FALLBACK_FRAME_STATE_FOR x86_64_dragonfly_fallback_frame_state + + +static void +x86_64_sigtramp_range (unsigned char **start, unsigned char **end) +{ + unsigned long ps_strings; + int mib[2]; + size_t len; + + mib[0] = CTL_KERN; + mib[1] = KERN_PS_STRINGS; + len = sizeof (ps_strings); + sysctl (mib, 2, &ps_strings, &len, NULL, 0); + + *start = (unsigned char *)ps_strings - 32; + *end = (unsigned char *)ps_strings; +} + + +static _Unwind_Reason_Code +x86_64_dragonfly_fallback_frame_state +(struct _Unwind_Context *context, _Unwind_FrameState *fs) +{ + unsigned char *pc = context->ra; + unsigned char *sigtramp_start, *sigtramp_end; + struct sigframe *sf; + long new_cfa; + + x86_64_sigtramp_range(&sigtramp_start, &sigtramp_end); + if (pc >= sigtramp_end || pc < sigtramp_start) + return _URC_END_OF_STACK; + + sf = (struct sigframe *) context->cfa; + new_cfa = sf->REG_NAME(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)&sf->REG_NAME(rax) - new_cfa; + fs->regs.reg[1].how = REG_SAVED_OFFSET; + fs->regs.reg[1].loc.offset = (long)&sf->REG_NAME(rdx) - new_cfa; + fs->regs.reg[2].how = REG_SAVED_OFFSET; + fs->regs.reg[2].loc.offset = (long)&sf->REG_NAME(rcx) - new_cfa; + fs->regs.reg[3].how = REG_SAVED_OFFSET; + fs->regs.reg[3].loc.offset = (long)&sf->REG_NAME(rbx) - new_cfa; + fs->regs.reg[4].how = REG_SAVED_OFFSET; + fs->regs.reg[4].loc.offset = (long)&sf->REG_NAME(rsi) - new_cfa; + fs->regs.reg[5].how = REG_SAVED_OFFSET; + fs->regs.reg[5].loc.offset = (long)&sf->REG_NAME(rdi) - new_cfa; + fs->regs.reg[6].how = REG_SAVED_OFFSET; + fs->regs.reg[6].loc.offset = (long)&sf->REG_NAME(rbp) - new_cfa; + fs->regs.reg[8].how = REG_SAVED_OFFSET; + fs->regs.reg[8].loc.offset = (long)&sf->REG_NAME(r8) - new_cfa; + fs->regs.reg[9].how = REG_SAVED_OFFSET; + fs->regs.reg[9].loc.offset = (long)&sf->REG_NAME(r9) - new_cfa; + fs->regs.reg[10].how = REG_SAVED_OFFSET; + fs->regs.reg[10].loc.offset = (long)&sf->REG_NAME(r10) - new_cfa; + fs->regs.reg[11].how = REG_SAVED_OFFSET; + fs->regs.reg[11].loc.offset = (long)&sf->REG_NAME(r11) - new_cfa; + fs->regs.reg[12].how = REG_SAVED_OFFSET; + fs->regs.reg[12].loc.offset = (long)&sf->REG_NAME(r12) - new_cfa; + fs->regs.reg[13].how = REG_SAVED_OFFSET; + fs->regs.reg[13].loc.offset = (long)&sf->REG_NAME(r13) - new_cfa; + fs->regs.reg[14].how = REG_SAVED_OFFSET; + fs->regs.reg[14].loc.offset = (long)&sf->REG_NAME(r14) - new_cfa; + fs->regs.reg[15].how = REG_SAVED_OFFSET; + fs->regs.reg[15].loc.offset = (long)&sf->REG_NAME(r15) - new_cfa; + fs->regs.reg[16].how = REG_SAVED_OFFSET; + fs->regs.reg[16].loc.offset = (long)&sf->REG_NAME(rip) - new_cfa; + fs->retaddr_column = 16; + fs->signal_frame = 1; + return _URC_NO_REASON; +} + +#else /* Next section is for i386 */ + +#define MD_FALLBACK_FRAME_STATE_FOR x86_dragonfly_fallback_frame_state + + +static void +x86_sigtramp_range (unsigned char **start, unsigned char **end) +{ + unsigned long ps_strings; + int mib[2]; + size_t len; + + mib[0] = CTL_KERN; + mib[1] = KERN_PS_STRINGS; + len = sizeof (ps_strings); + sysctl (mib, 2, &ps_strings, &len, NULL, 0); + + *start = (unsigned char *)ps_strings - 128; + *end = (unsigned char *)ps_strings; +} + + +static _Unwind_Reason_Code +x86_dragonfly_fallback_frame_state +(struct _Unwind_Context *context, _Unwind_FrameState *fs) +{ + unsigned char *pc = context->ra; + unsigned char *sigtramp_start, *sigtramp_end; + struct sigframe *sf; + long new_cfa; + + x86_sigtramp_range(&sigtramp_start, &sigtramp_end); + + if (pc >= sigtramp_end || pc < sigtramp_start) + return _URC_END_OF_STACK; + + sf = (struct sigframe *) context->cfa; + new_cfa = sf->REG_NAME(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)&sf->REG_NAME(eax) - new_cfa; + fs->regs.reg[3].how = REG_SAVED_OFFSET; + fs->regs.reg[3].loc.offset = (long)&sf->REG_NAME(ebx) - new_cfa; + fs->regs.reg[1].how = REG_SAVED_OFFSET; + fs->regs.reg[1].loc.offset = (long)&sf->REG_NAME(ecx) - new_cfa; + fs->regs.reg[2].how = REG_SAVED_OFFSET; + fs->regs.reg[2].loc.offset = (long)&sf->REG_NAME(edx) - new_cfa; + fs->regs.reg[6].how = REG_SAVED_OFFSET; + fs->regs.reg[6].loc.offset = (long)&sf->REG_NAME(esi) - new_cfa; + fs->regs.reg[7].how = REG_SAVED_OFFSET; + fs->regs.reg[7].loc.offset = (long)&sf->REG_NAME(edi) - new_cfa; + fs->regs.reg[5].how = REG_SAVED_OFFSET; + fs->regs.reg[5].loc.offset = (long)&sf->REG_NAME(ebp) - new_cfa; + fs->regs.reg[8].how = REG_SAVED_OFFSET; + fs->regs.reg[8].loc.offset = (long)&sf->REG_NAME(eip) - new_cfa; + fs->retaddr_column = 8; + fs->signal_frame = 1; + return _URC_NO_REASON; +} +#endif /* ifdef __x86_64__ */ |