--- /dev/null
+/* DWARF2 EH unwinding support for SH Linux.
+ Copyright (C) 2004, 2005, 2006, 2007, 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. */
+
+#include <signal.h>
+#include <sys/ucontext.h>
+#include "insn-constants.h"
+
+# if defined (__SH5__)
+#define SH_DWARF_FRAME_GP0 0
+#define SH_DWARF_FRAME_FP0 77
+#define SH_DWARF_FRAME_BT0 68
+#define SH_DWARF_FRAME_PR_MEDIA 18
+#define SH_DWARF_FRAME_SR 65
+#define SH_DWARF_FRAME_FPSCR 76
+#else
+#define SH_DWARF_FRAME_GP0 0
+#define SH_DWARF_FRAME_FP0 25
+#define SH_DWARF_FRAME_XD0 87
+#define SH_DWARF_FRAME_PR 17
+#define SH_DWARF_FRAME_GBR 18
+#define SH_DWARF_FRAME_MACH 20
+#define SH_DWARF_FRAME_MACL 21
+#define SH_DWARF_FRAME_PC 16
+#define SH_DWARF_FRAME_SR 22
+#define SH_DWARF_FRAME_FPUL 23
+#define SH_DWARF_FRAME_FPSCR 24
+#endif /* defined (__SH5__) */
+
+#if defined (__SH5__)
+
+#define MD_FALLBACK_FRAME_STATE_FOR shmedia_fallback_frame_state
+
+static _Unwind_Reason_Code
+shmedia_fallback_frame_state (struct _Unwind_Context *context,
+ _Unwind_FrameState *fs)
+{
+ unsigned char *pc = context->ra;
+ struct sigcontext *sc;
+ long new_cfa;
+ int i, r;
+
+ /* movi 0x10,r9; shori 0x77,r9; trapa r9; nop (sigreturn) */
+ /* movi 0x10,r9; shori 0xad,r9; trapa r9; nop (rt_sigreturn) */
+ if ((*(unsigned long *) (pc-1) == 0xcc004090)
+ && (*(unsigned long *) (pc+3) == 0xc801dc90)
+ && (*(unsigned long *) (pc+7) == 0x6c91fff0)
+ && (*(unsigned long *) (pc+11) == 0x6ff0fff0))
+ sc = context->cfa;
+ else if ((*(unsigned long *) (pc-1) == 0xcc004090)
+ && (*(unsigned long *) (pc+3) == 0xc802b490)
+ && (*(unsigned long *) (pc+7) == 0x6c91fff0)
+ && (*(unsigned long *) (pc+11) == 0x6ff0fff0))
+ {
+ struct rt_sigframe {
+ struct siginfo *pinfo;
+ void *puc;
+ struct siginfo 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->sc_regs[15];
+ fs->regs.cfa_how = CFA_REG_OFFSET;
+ fs->regs.cfa_reg = 15;
+ fs->regs.cfa_offset = new_cfa - (long) context->cfa;
+
+ for (i = 0; i < 63; i++)
+ {
+ if (i == 15)
+ continue;
+
+ fs->regs.reg[i].how = REG_SAVED_OFFSET;
+ fs->regs.reg[i].loc.offset
+ = (long)&(sc->sc_regs[i]) - new_cfa;
+ }
+
+ fs->regs.reg[SH_DWARF_FRAME_SR].how = REG_SAVED_OFFSET;
+ fs->regs.reg[SH_DWARF_FRAME_SR].loc.offset
+ = (long)&(sc->sc_sr) - new_cfa;
+
+ r = SH_DWARF_FRAME_BT0;
+ for (i = 0; i < 8; i++)
+ {
+ fs->regs.reg[r+i].how = REG_SAVED_OFFSET;
+ fs->regs.reg[r+i].loc.offset
+ = (long)&(sc->sc_tregs[i]) - new_cfa;
+ }
+
+ r = SH_DWARF_FRAME_FP0;
+ for (i = 0; i < 32; i++)
+ {
+ fs->regs.reg[r+i].how = REG_SAVED_OFFSET;
+ fs->regs.reg[r+i].loc.offset
+ = (long)&(sc->sc_fpregs[i]) - new_cfa;
+ }
+
+ fs->regs.reg[SH_DWARF_FRAME_FPSCR].how = REG_SAVED_OFFSET;
+ fs->regs.reg[SH_DWARF_FRAME_FPSCR].loc.offset
+ = (long)&(sc->sc_fpscr) - new_cfa;
+
+ /* We use the slot for the zero register to save return address. */
+ fs->regs.reg[63].how = REG_SAVED_OFFSET;
+ fs->regs.reg[63].loc.offset
+ = (long)&(sc->sc_pc) - new_cfa;
+ fs->retaddr_column = 63;
+ fs->signal_frame = 1;
+ return _URC_NO_REASON;
+}
+
+#else /* defined (__SH5__) */
+
+#define MD_FALLBACK_FRAME_STATE_FOR sh_fallback_frame_state
+
+static _Unwind_Reason_Code
+sh_fallback_frame_state (struct _Unwind_Context *context,
+ _Unwind_FrameState *fs)
+{
+ unsigned char *pc = context->ra;
+ struct sigcontext *sc;
+ long new_cfa;
+ int i;
+#if defined (__SH3E__) || defined (__SH4__)
+ int r;
+#endif
+
+ /* mov.w 1f,r3; trapa #0x10; 1: .short 0x77 (sigreturn) */
+ /* mov.w 1f,r3; trapa #0x10; 1: .short 0xad (rt_sigreturn) */
+ /* Newer kernel uses pad instructions to avoid an SH-4 core bug. */
+ /* mov.w 1f,r3; trapa #0x10; or r0,r0; or r0,r0; or r0,r0; or r0,r0;
+ or r0,r0; 1: .short 0x77 (sigreturn) */
+ /* mov.w 1f,r3; trapa #0x10; or r0,r0; or r0,r0; or r0,r0; or r0,r0;
+ or r0,r0; 1: .short 0xad (rt_sigreturn) */
+ if (((*(unsigned short *) (pc+0) == 0x9300)
+ && (*(unsigned short *) (pc+2) == 0xc310)
+ && (*(unsigned short *) (pc+4) == 0x0077))
+ || (((*(unsigned short *) (pc+0) == 0x9305)
+ && (*(unsigned short *) (pc+2) == 0xc310)
+ && (*(unsigned short *) (pc+14) == 0x0077))))
+ sc = context->cfa;
+ else if (((*(unsigned short *) (pc+0) == 0x9300)
+ && (*(unsigned short *) (pc+2) == 0xc310)
+ && (*(unsigned short *) (pc+4) == 0x00ad))
+ || (((*(unsigned short *) (pc+0) == 0x9305)
+ && (*(unsigned short *) (pc+2) == 0xc310)
+ && (*(unsigned short *) (pc+14) == 0x00ad))))
+ {
+ struct rt_sigframe {
+ struct siginfo 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->sc_regs[15];
+ fs->regs.cfa_how = CFA_REG_OFFSET;
+ fs->regs.cfa_reg = 15;
+ fs->regs.cfa_offset = new_cfa - (long) context->cfa;
+
+ for (i = 0; i < 15; i++)
+ {
+ fs->regs.reg[i].how = REG_SAVED_OFFSET;
+ fs->regs.reg[i].loc.offset
+ = (long)&(sc->sc_regs[i]) - new_cfa;
+ }
+
+ fs->regs.reg[SH_DWARF_FRAME_PR].how = REG_SAVED_OFFSET;
+ fs->regs.reg[SH_DWARF_FRAME_PR].loc.offset
+ = (long)&(sc->sc_pr) - new_cfa;
+ fs->regs.reg[SH_DWARF_FRAME_SR].how = REG_SAVED_OFFSET;
+ fs->regs.reg[SH_DWARF_FRAME_SR].loc.offset
+ = (long)&(sc->sc_sr) - new_cfa;
+ fs->regs.reg[SH_DWARF_FRAME_GBR].how = REG_SAVED_OFFSET;
+ fs->regs.reg[SH_DWARF_FRAME_GBR].loc.offset
+ = (long)&(sc->sc_gbr) - new_cfa;
+ fs->regs.reg[SH_DWARF_FRAME_MACH].how = REG_SAVED_OFFSET;
+ fs->regs.reg[SH_DWARF_FRAME_MACH].loc.offset
+ = (long)&(sc->sc_mach) - new_cfa;
+ fs->regs.reg[SH_DWARF_FRAME_MACL].how = REG_SAVED_OFFSET;
+ fs->regs.reg[SH_DWARF_FRAME_MACL].loc.offset
+ = (long)&(sc->sc_macl) - new_cfa;
+
+#if defined (__SH3E__) || defined (__SH4__)
+ r = SH_DWARF_FRAME_FP0;
+ for (i = 0; i < 16; i++)
+ {
+ fs->regs.reg[r+i].how = REG_SAVED_OFFSET;
+ fs->regs.reg[r+i].loc.offset
+ = (long)&(sc->sc_fpregs[i]) - new_cfa;
+ }
+
+ r = SH_DWARF_FRAME_XD0;
+ for (i = 0; i < 8; i++)
+ {
+ fs->regs.reg[r+i].how = REG_SAVED_OFFSET;
+ fs->regs.reg[r+i].loc.offset
+ = (long)&(sc->sc_xfpregs[2*i]) - new_cfa;
+ }
+
+ fs->regs.reg[SH_DWARF_FRAME_FPUL].how = REG_SAVED_OFFSET;
+ fs->regs.reg[SH_DWARF_FRAME_FPUL].loc.offset
+ = (long)&(sc->sc_fpul) - new_cfa;
+ fs->regs.reg[SH_DWARF_FRAME_FPSCR].how = REG_SAVED_OFFSET;
+ fs->regs.reg[SH_DWARF_FRAME_FPSCR].loc.offset
+ = (long)&(sc->sc_fpscr) - new_cfa;
+#endif
+
+ fs->regs.reg[SH_DWARF_FRAME_PC].how = REG_SAVED_OFFSET;
+ fs->regs.reg[SH_DWARF_FRAME_PC].loc.offset
+ = (long)&(sc->sc_pc) - new_cfa;
+ fs->retaddr_column = SH_DWARF_FRAME_PC;
+ fs->signal_frame = 1;
+ return _URC_NO_REASON;
+}
+#endif /* defined (__SH5__) */
projects / msp430-gcc.git / blobdiff