200 lines
6.7 KiB
C
200 lines
6.7 KiB
C
/* DWARF2 EH unwinding support for IA64 Linux.
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Copyright (C) 2004-2022 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 it
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under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 3, or (at your
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option) any later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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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-ia64.c for the structs. */
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/* This works only for glibc-2.3 and later, because sigcontext is different
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in glibc-2.2.4. */
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#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)
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#include <signal.h>
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#include <sys/ucontext.h>
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#define IA64_GATE_AREA_START 0xa000000000000100LL
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#define IA64_GATE_AREA_END 0xa000000000030000LL
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#define MD_FALLBACK_FRAME_STATE_FOR ia64_fallback_frame_state
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static _Unwind_Reason_Code
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ia64_fallback_frame_state (struct _Unwind_Context *context,
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_Unwind_FrameState *fs)
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{
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if (context->rp >= IA64_GATE_AREA_START
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&& context->rp < IA64_GATE_AREA_END)
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{
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struct sigframe {
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char scratch[16];
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unsigned long sig_number;
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siginfo_t *info;
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struct sigcontext *sc;
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} *frame_ = (struct sigframe *)context->psp;
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struct sigcontext *sc = frame_->sc;
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/* Restore scratch registers in case the unwinder needs to
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refer to a value stored in one of them. */
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{
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int i;
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for (i = 2; i < 4; i++)
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context->ireg[i - 2].loc = &sc->sc_gr[i];
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for (i = 8; i < 12; i++)
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context->ireg[i - 2].loc = &sc->sc_gr[i];
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for (i = 14; i < 32; i++)
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context->ireg[i - 2].loc = &sc->sc_gr[i];
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}
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context->fpsr_loc = &(sc->sc_ar_fpsr);
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context->signal_pfs_loc = &(sc->sc_ar_pfs);
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context->lc_loc = &(sc->sc_ar_lc);
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context->unat_loc = &(sc->sc_ar_unat);
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context->br_loc[0] = &(sc->sc_br[0]);
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context->br_loc[6] = &(sc->sc_br[6]);
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context->br_loc[7] = &(sc->sc_br[7]);
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context->pr = sc->sc_pr;
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context->psp = sc->sc_gr[12];
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context->gp = sc->sc_gr[1];
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/* Signal frame doesn't have an associated reg. stack frame
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other than what we adjust for below. */
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fs -> no_reg_stack_frame = 1;
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if (sc->sc_rbs_base)
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{
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/* Need to switch from alternate register backing store. */
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long ndirty, loadrs = sc->sc_loadrs >> 16;
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unsigned long alt_bspstore = context->bsp - loadrs;
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unsigned long bspstore;
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unsigned long *ar_bsp = (unsigned long *)(sc->sc_ar_bsp);
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ndirty = ia64_rse_num_regs ((unsigned long *) alt_bspstore,
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(unsigned long *) context->bsp);
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bspstore = (unsigned long)
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ia64_rse_skip_regs (ar_bsp, -ndirty);
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ia64_copy_rbs (context, bspstore, alt_bspstore, loadrs,
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sc->sc_ar_rnat);
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}
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/* Don't touch the branch registers o.t. b0, b6 and b7.
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The kernel doesn't pass the preserved branch registers
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in the sigcontext but leaves them intact, so there's no
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need to do anything with them here. */
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{
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unsigned long sof = sc->sc_cfm & 0x7f;
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context->bsp = (unsigned long)
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ia64_rse_skip_regs ((unsigned long *)(sc->sc_ar_bsp), -sof);
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}
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/* Account for use of br.ret to resume execution of user code. */
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fs->curr.reg[UNW_REG_RP].where = UNW_WHERE_SPREL;
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fs->curr.reg[UNW_REG_RP].val
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= (unsigned long)&(sc->sc_ip) - context->psp;
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fs->curr.reg[UNW_REG_RP].when = -1;
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fs->curr.reg[UNW_REG_PFS].where = UNW_WHERE_SPREL;
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fs->curr.reg[UNW_REG_PFS].val
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= (unsigned long)&(sc->sc_cfm) - context->psp;
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fs ->curr.reg[UNW_REG_PFS].when = -1;
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return _URC_NO_REASON;
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}
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return _URC_END_OF_STACK;
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}
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#define MD_HANDLE_UNWABI ia64_handle_unwabi
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#define ABI_MARKER_OLD_LINUX_SIGTRAMP ((0 << 8) | 's')
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#define ABI_MARKER_OLD_LINUX_INTERRUPT ((0 << 8) | 'i')
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#define ABI_MARKER_LINUX_SIGTRAMP ((3 << 8) | 's')
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#define ABI_MARKER_LINUX_INTERRUPT ((3 << 8) | 'i')
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static void
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ia64_handle_unwabi (struct _Unwind_Context *context, _Unwind_FrameState *fs)
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{
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if (fs->unwabi == ABI_MARKER_LINUX_SIGTRAMP
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|| fs->unwabi == ABI_MARKER_OLD_LINUX_SIGTRAMP)
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{
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struct sigframe {
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char scratch[16];
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unsigned long sig_number;
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siginfo_t *info;
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struct sigcontext *sc;
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} *frame = (struct sigframe *)context->psp;
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struct sigcontext *sc = frame->sc;
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/* Restore scratch registers in case the unwinder needs to
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refer to a value stored in one of them. */
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{
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int i;
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for (i = 2; i < 4; i++)
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context->ireg[i - 2].loc = &sc->sc_gr[i];
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for (i = 8; i < 12; i++)
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context->ireg[i - 2].loc = &sc->sc_gr[i];
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for (i = 14; i < 32; i++)
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context->ireg[i - 2].loc = &sc->sc_gr[i];
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}
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context->signal_pfs_loc = &(sc->sc_ar_pfs);
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context->lc_loc = &(sc->sc_ar_lc);
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context->unat_loc = &(sc->sc_ar_unat);
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context->br_loc[0] = &(sc->sc_br[0]);
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context->br_loc[6] = &(sc->sc_br[6]);
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context->br_loc[7] = &(sc->sc_br[7]);
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context->pr = sc->sc_pr;
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context->gp = sc->sc_gr[1];
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/* Signal frame doesn't have an associated reg. stack frame
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other than what we adjust for below. */
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fs -> no_reg_stack_frame = 1;
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if (sc->sc_rbs_base)
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{
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/* Need to switch from alternate register backing store. */
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long ndirty, loadrs = sc->sc_loadrs >> 16;
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unsigned long alt_bspstore = context->bsp - loadrs;
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unsigned long bspstore;
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unsigned long *ar_bsp = (unsigned long *)(sc->sc_ar_bsp);
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ndirty = ia64_rse_num_regs ((unsigned long *) alt_bspstore,
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(unsigned long *) context->bsp);
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bspstore = (unsigned long) ia64_rse_skip_regs (ar_bsp, -ndirty);
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ia64_copy_rbs (context, bspstore, alt_bspstore, loadrs,
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sc->sc_ar_rnat);
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}
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/* Don't touch the branch registers o.t. b0, b6 and b7.
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The kernel doesn't pass the preserved branch registers
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in the sigcontext but leaves them intact, so there's no
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need to do anything with them here. */
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{
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unsigned long sof = sc->sc_cfm & 0x7f;
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context->bsp = (unsigned long)
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ia64_rse_skip_regs ((unsigned long *)(sc->sc_ar_bsp), -sof);
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}
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/* The use of br.ret to resume execution of user code is already
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accounted for in the unwind ABI. */
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}
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}
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#endif /* glibc-2.3 or better */
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