libgcc/config/ia64/linux-unwind.h - gcc - Git at Google

 /* DWARF2 EH unwinding support for IA64 Linux.
    Copyright (C) 2004-2021 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-ia64.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;
 	siginfo_t *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->signal_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);
       }

       /* Account for use of br.ret to resume execution of user code.  */
       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;

       fs->curr.reg[UNW_REG_PFS].where = UNW_WHERE_SPREL;
       fs->curr.reg[UNW_REG_PFS].val
 	= (unsigned long)&(sc->sc_cfm) - context->psp;
       fs ->curr.reg[UNW_REG_PFS].when = -1;

       return _URC_NO_REASON;
     }
   return _URC_END_OF_STACK;
 }

 #define MD_HANDLE_UNWABI ia64_handle_unwabi

 #define ABI_MARKER_OLD_LINUX_SIGTRAMP	((0 << 8) | 's')
 #define ABI_MARKER_OLD_LINUX_INTERRUPT	((0 << 8) | 'i')
 #define ABI_MARKER_LINUX_SIGTRAMP	((3 << 8) | 's')
 #define ABI_MARKER_LINUX_INTERRUPT	((3 << 8) | 'i')

 static void
 ia64_handle_unwabi (struct _Unwind_Context *context, _Unwind_FrameState *fs)
 {
   if (fs->unwabi == ABI_MARKER_LINUX_SIGTRAMP
       || fs->unwabi == ABI_MARKER_OLD_LINUX_SIGTRAMP)
     {
       struct sigframe {
 	char scratch[16];
 	unsigned long sig_number;
 	siginfo_t *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->signal_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);
       }

       /* The use of br.ret to resume execution of user code is already
 	 accounted for in the unwind ABI.  */
     }
 }
 #endif /* glibc-2.3 or better */
	/* DWARF2 EH unwinding support for IA64 Linux.
	Copyright (C) 2004-2021 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-ia64.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;
	siginfo_t *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->signal_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);
	}

	/* Account for use of br.ret to resume execution of user code. */
	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;

	fs->curr.reg[UNW_REG_PFS].where = UNW_WHERE_SPREL;
	fs->curr.reg[UNW_REG_PFS].val
	= (unsigned long)&(sc->sc_cfm) - context->psp;
	fs ->curr.reg[UNW_REG_PFS].when = -1;

	return _URC_NO_REASON;
	}
	return _URC_END_OF_STACK;
	}

	#define MD_HANDLE_UNWABI ia64_handle_unwabi

	#define ABI_MARKER_OLD_LINUX_SIGTRAMP ((0 << 8) \| 's')
	#define ABI_MARKER_OLD_LINUX_INTERRUPT ((0 << 8) \| 'i')
	#define ABI_MARKER_LINUX_SIGTRAMP ((3 << 8) \| 's')
	#define ABI_MARKER_LINUX_INTERRUPT ((3 << 8) \| 'i')

	static void
	ia64_handle_unwabi (struct _Unwind_Context context, _Unwind_FrameState fs)
	{
	if (fs->unwabi == ABI_MARKER_LINUX_SIGTRAMP
	\|\| fs->unwabi == ABI_MARKER_OLD_LINUX_SIGTRAMP)
	{
	struct sigframe {
	char scratch[16];
	unsigned long sig_number;
	siginfo_t *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->signal_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);
	}

	/* The use of br.ret to resume execution of user code is already
	accounted for in the unwind ABI. */
	}
	}
	#endif /* glibc-2.3 or better */