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+/* DWARF2 EH unwinding support for IA64 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. */
+
+/* Do code reading to identify a signal frame, and set the frame
+ state data appropriately. See unwind-dw2.c for the structs. */
+
+/* This works only for glibc-2.3 and later, because sigcontext is different
+ in glibc-2.2.4. */
+
+#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)
+#include <signal.h>
+#include <sys/ucontext.h>
+
+#define IA64_GATE_AREA_START 0xa000000000000100LL
+#define IA64_GATE_AREA_END 0xa000000000030000LL
+
+#define MD_FALLBACK_FRAME_STATE_FOR ia64_fallback_frame_state
+
+static _Unwind_Reason_Code
+ia64_fallback_frame_state (struct _Unwind_Context *context,
+ _Unwind_FrameState *fs)
+{
+ if (context->rp >= IA64_GATE_AREA_START
+ && context->rp < IA64_GATE_AREA_END)
+ {
+ struct sigframe {
+ char scratch[16];
+ unsigned long sig_number;
+ struct siginfo *info;
+ struct sigcontext *sc;
+ } *frame_ = (struct sigframe *)context->psp;
+ struct sigcontext *sc = frame_->sc;
+
+ /* Restore scratch registers in case the unwinder needs to
+ refer to a value stored in one of them. */
+ {
+ int i;
+
+ for (i = 2; i < 4; i++)
+ context->ireg[i - 2].loc = &sc->sc_gr[i];
+ for (i = 8; i < 12; i++)
+ context->ireg[i - 2].loc = &sc->sc_gr[i];
+ for (i = 14; i < 32; i++)
+ context->ireg[i - 2].loc = &sc->sc_gr[i];
+ }
+
+ context->fpsr_loc = &(sc->sc_ar_fpsr);
+ context->pfs_loc = &(sc->sc_ar_pfs);
+ context->lc_loc = &(sc->sc_ar_lc);
+ context->unat_loc = &(sc->sc_ar_unat);
+ context->br_loc[0] = &(sc->sc_br[0]);
+ context->br_loc[6] = &(sc->sc_br[6]);
+ context->br_loc[7] = &(sc->sc_br[7]);
+ context->pr = sc->sc_pr;
+ context->psp = sc->sc_gr[12];
+ context->gp = sc->sc_gr[1];
+ /* Signal frame doesn't have an associated reg. stack frame
+ other than what we adjust for below. */
+ fs -> no_reg_stack_frame = 1;
+
+ if (sc->sc_rbs_base)
+ {
+ /* Need to switch from alternate register backing store. */
+ long ndirty, loadrs = sc->sc_loadrs >> 16;
+ unsigned long alt_bspstore = context->bsp - loadrs;
+ unsigned long bspstore;
+ unsigned long *ar_bsp = (unsigned long *)(sc->sc_ar_bsp);
+
+ ndirty = ia64_rse_num_regs ((unsigned long *) alt_bspstore,
+ (unsigned long *) context->bsp);
+ bspstore = (unsigned long)
+ ia64_rse_skip_regs (ar_bsp, -ndirty);
+ ia64_copy_rbs (context, bspstore, alt_bspstore, loadrs,
+ sc->sc_ar_rnat);
+ }
+
+ /* Don't touch the branch registers o.t. b0, b6 and b7.
+ The kernel doesn't pass the preserved branch registers
+ in the sigcontext but leaves them intact, so there's no
+ need to do anything with them here. */
+ {
+ unsigned long sof = sc->sc_cfm & 0x7f;
+ context->bsp = (unsigned long)
+ ia64_rse_skip_regs ((unsigned long *)(sc->sc_ar_bsp), -sof);
+ }
+
+ fs->curr.reg[UNW_REG_RP].where = UNW_WHERE_SPREL;
+ fs->curr.reg[UNW_REG_RP].val
+ = (unsigned long)&(sc->sc_ip) - context->psp;
+ fs->curr.reg[UNW_REG_RP].when = -1;
+
+ return _URC_NO_REASON;
+ }
+ return _URC_END_OF_STACK;
+}
+
+#define MD_HANDLE_UNWABI ia64_handle_unwabi
+
+static void
+ia64_handle_unwabi (struct _Unwind_Context *context, _Unwind_FrameState *fs)
+{
+ if (fs->unwabi == ((3 << 8) | 's')
+ || fs->unwabi == ((0 << 8) | 's'))
+ {
+ struct sigframe {
+ char scratch[16];
+ unsigned long sig_number;
+ struct siginfo *info;
+ struct sigcontext *sc;
+ } *frame = (struct sigframe *)context->psp;
+ struct sigcontext *sc = frame->sc;
+
+ /* Restore scratch registers in case the unwinder needs to
+ refer to a value stored in one of them. */
+ {
+ int i;
+
+ for (i = 2; i < 4; i++)
+ context->ireg[i - 2].loc = &sc->sc_gr[i];
+ for (i = 8; i < 12; i++)
+ context->ireg[i - 2].loc = &sc->sc_gr[i];
+ for (i = 14; i < 32; i++)
+ context->ireg[i - 2].loc = &sc->sc_gr[i];
+ }
+
+ context->pfs_loc = &(sc->sc_ar_pfs);
+ context->lc_loc = &(sc->sc_ar_lc);
+ context->unat_loc = &(sc->sc_ar_unat);
+ context->br_loc[0] = &(sc->sc_br[0]);
+ context->br_loc[6] = &(sc->sc_br[6]);
+ context->br_loc[7] = &(sc->sc_br[7]);
+ context->pr = sc->sc_pr;
+ context->gp = sc->sc_gr[1];
+ /* Signal frame doesn't have an associated reg. stack frame
+ other than what we adjust for below. */
+ fs -> no_reg_stack_frame = 1;
+
+ if (sc->sc_rbs_base)
+ {
+ /* Need to switch from alternate register backing store. */
+ long ndirty, loadrs = sc->sc_loadrs >> 16;
+ unsigned long alt_bspstore = context->bsp - loadrs;
+ unsigned long bspstore;
+ unsigned long *ar_bsp = (unsigned long *)(sc->sc_ar_bsp);
+
+ ndirty = ia64_rse_num_regs ((unsigned long *) alt_bspstore,
+ (unsigned long *) context->bsp);
+ bspstore = (unsigned long) ia64_rse_skip_regs (ar_bsp, -ndirty);
+ ia64_copy_rbs (context, bspstore, alt_bspstore, loadrs,
+ sc->sc_ar_rnat);
+ }
+
+ /* Don't touch the branch registers o.t. b0, b6 and b7.
+ The kernel doesn't pass the preserved branch registers
+ in the sigcontext but leaves them intact, so there's no
+ need to do anything with them here. */
+ {
+ unsigned long sof = sc->sc_cfm & 0x7f;
+ context->bsp = (unsigned long)
+ ia64_rse_skip_regs ((unsigned long *)(sc->sc_ar_bsp), -sof);
+ }
+
+ /* pfs_loc already set above. Without this pfs_loc would point
+ incorrectly to sc_cfm instead of sc_ar_pfs. */
+ fs->curr.reg[UNW_REG_PFS].where = UNW_WHERE_NONE;
+ }
+}
+#endif /* glibc-2.3 or better */
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