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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [config/] [s390/] [linux-unwind.h] - Rev 438
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/* DWARF2 EH unwinding support for S/390 Linux. Copyright (C) 2004, 2005, 2006, 2009 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. */ #define MD_FALLBACK_FRAME_STATE_FOR s390_fallback_frame_state static _Unwind_Reason_Code s390_fallback_frame_state (struct _Unwind_Context *context, _Unwind_FrameState *fs) { unsigned char *pc = context->ra; long new_cfa; int i; typedef struct { unsigned long psw_mask; unsigned long psw_addr; unsigned long gprs[16]; unsigned int acrs[16]; unsigned int fpc; unsigned int __pad; double fprs[16]; } __attribute__ ((__aligned__ (8))) sigregs_; sigregs_ *regs; int *signo; /* svc $__NR_sigreturn or svc $__NR_rt_sigreturn */ if (pc[0] != 0x0a || (pc[1] != 119 && pc[1] != 173)) return _URC_END_OF_STACK; /* Legacy frames: old signal mask (8 bytes) pointer to sigregs (8 bytes) - points always to next location sigregs retcode This frame layout was used on kernels < 2.6.9 for non-RT frames, and on kernels < 2.4.13 for RT frames as well. Note that we need to look at RA to detect this layout -- this means that if you use sa_restorer to install a different signal restorer on a legacy kernel, unwinding from signal frames will not work. */ if (context->ra == context->cfa + 16 + sizeof (sigregs_)) { regs = (sigregs_ *)(context->cfa + 16); signo = NULL; } /* New-style RT frame: retcode + alignment (8 bytes) siginfo (128 bytes) ucontext (contains sigregs) */ else if (pc[1] == 173 /* __NR_rt_sigreturn */) { struct ucontext_ { unsigned long uc_flags; struct ucontext_ *uc_link; unsigned long uc_stack[3]; sigregs_ uc_mcontext; } *uc = context->cfa + 8 + 128; regs = &uc->uc_mcontext; signo = context->cfa + sizeof(long); } /* New-style non-RT frame: old signal mask (8 bytes) pointer to sigregs (followed by signal number) */ else { regs = *(sigregs_ **)(context->cfa + 8); signo = (int *)(regs + 1); } new_cfa = regs->gprs[15] + 16*sizeof(long) + 32; fs->regs.cfa_how = CFA_REG_OFFSET; fs->regs.cfa_reg = 15; fs->regs.cfa_offset = new_cfa - (long) context->cfa + 16*sizeof(long) + 32; for (i = 0; i < 16; i++) { fs->regs.reg[i].how = REG_SAVED_OFFSET; fs->regs.reg[i].loc.offset = (long)®s->gprs[i] - new_cfa; } for (i = 0; i < 16; i++) { fs->regs.reg[16+i].how = REG_SAVED_OFFSET; fs->regs.reg[16+i].loc.offset = (long)®s->fprs[i] - new_cfa; } /* Load return addr from PSW into dummy register 32. */ fs->regs.reg[32].how = REG_SAVED_OFFSET; fs->regs.reg[32].loc.offset = (long)®s->psw_addr - new_cfa; fs->retaddr_column = 32; /* SIGILL, SIGFPE and SIGTRAP are delivered with psw_addr after the faulting instruction rather than before it. Don't set FS->signal_frame in that case. */ if (!signo || (*signo != 4 && *signo != 5 && *signo != 8)) fs->signal_frame = 1; return _URC_NO_REASON; }
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