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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [gcc/] [config/] [mips/] [linux-unwind.h] - Rev 856
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/* DWARF2 EH unwinding support for MIPS Linux. Copyright (C) 2004, 2005 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 2, or (at your option) any later version. In addition to the permissions in the GNU General Public License, the Free Software Foundation gives you unlimited permission to link the compiled version of this file with other programs, and to distribute those programs without any restriction coming from the use of this file. (The General Public License restrictions do apply in other respects; for example, they cover modification of the file, and distribution when not linked into another program.) 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. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING. If not, write to the Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #ifndef inhibit_libc /* Do code reading to identify a signal frame, and set the frame state data appropriately. See unwind-dw2.c for the structs. */ #include <signal.h> #include <asm/unistd.h> /* The third parameter to the signal handler points to something with * this structure defined in asm/ucontext.h, but the name clashes with * struct ucontext from sys/ucontext.h so this private copy is used. */ typedef struct _sig_ucontext { unsigned long uc_flags; struct _sig_ucontext *uc_link; stack_t uc_stack; struct sigcontext uc_mcontext; sigset_t uc_sigmask; } _sig_ucontext_t; #define MD_FALLBACK_FRAME_STATE_FOR mips_fallback_frame_state static _Unwind_Reason_Code mips_fallback_frame_state (struct _Unwind_Context *context, _Unwind_FrameState *fs) { u_int32_t *pc = (u_int32_t *) context->ra; struct sigcontext *sc; _Unwind_Ptr new_cfa; int i; /* 24021061 li v0, 0x1061 (rt_sigreturn)*/ /* 0000000c syscall */ /* or */ /* 24021017 li v0, 0x1017 (sigreturn) */ /* 0000000c syscall */ if (pc[1] != 0x0000000c) return _URC_END_OF_STACK; #if _MIPS_SIM == _ABIO32 if (pc[0] == (0x24020000 | __NR_sigreturn)) { struct sigframe { u_int32_t trampoline[2]; struct sigcontext sigctx; } *rt_ = context->ra; sc = &rt_->sigctx; } else #endif if (pc[0] == (0x24020000 | __NR_rt_sigreturn)) { struct rt_sigframe { u_int32_t trampoline[2]; struct siginfo info; _sig_ucontext_t uc; } *rt_ = context->ra; sc = &rt_->uc.uc_mcontext; } else return _URC_END_OF_STACK; new_cfa = (_Unwind_Ptr)sc; fs->cfa_how = CFA_REG_OFFSET; fs->cfa_reg = STACK_POINTER_REGNUM; fs->cfa_offset = new_cfa - (_Unwind_Ptr) context->cfa; #if _MIPS_SIM == _ABIO32 && defined __MIPSEB__ /* On o32 Linux, the register save slots in the sigcontext are eight bytes. We need the lower half of each register slot, so slide our view of the structure back four bytes. */ new_cfa -= 4; #endif for (i = 0; i < 32; i++) { fs->regs.reg[i].how = REG_SAVED_OFFSET; fs->regs.reg[i].loc.offset = (_Unwind_Ptr)&(sc->sc_regs[i]) - new_cfa; } fs->regs.reg[SIGNAL_UNWIND_RETURN_COLUMN].how = REG_SAVED_OFFSET; fs->regs.reg[SIGNAL_UNWIND_RETURN_COLUMN].loc.offset = (_Unwind_Ptr)&(sc->sc_pc) - new_cfa; fs->retaddr_column = SIGNAL_UNWIND_RETURN_COLUMN; return _URC_NO_REASON; } #endif
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