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