[thirdparty/gcc.git] / libgcc / config / i386 / sol2-unwind.h

/* DWARF2 EH unwinding support for AMD x86-64 and x86.
   Copyright (C) 2009-2024 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 <ucontext.h>
#include <sys/frame.h>

#ifdef __x86_64__

#define MD_FALLBACK_FRAME_STATE_FOR x86_64_fallback_frame_state

static _Unwind_Reason_Code
x86_64_fallback_frame_state (struct _Unwind_Context *context,
			     _Unwind_FrameState *fs)
{
  unsigned char *pc = context->ra;
  mcontext_t *mctx;
  long new_cfa;

  if (/* Solaris 10+
	------------
	<__sighndlr+0>:      push   %rbp
	<__sighndlr+1>:      mov    %rsp,%rbp
	<__sighndlr+4>:      callq  *%rcx
	<__sighndlr+6>:      leaveq           <--- PC
	<__sighndlr+7>:      retq  */
      *(unsigned long *)(pc - 6) == 0xc3c9d1ffe5894855)

    /* We need to move up three frames:

		<signal handler>	<-- context->cfa
		__sighndlr
		call_user_handler
		sigacthandler
		<kernel>

       context->cfa points into the frame after the saved frame pointer and
       saved pc (struct frame).

       The ucontext_t structure is in the kernel frame after the signal
       number and a siginfo_t *.  Since the frame sizes vary even within
       Solaris 10 updates, we need to walk the stack to get there.  */
    {
      struct frame *fp = (struct frame *) context->cfa - 1;
      struct handler_args {
	int signo;
	siginfo_t *sip;
	ucontext_t ucontext;
      } *handler_args;
      ucontext_t *ucp;

      /* Next frame: __sighndlr frame pointer.  */
      fp = (struct frame *) fp->fr_savfp;
      /* call_user_handler frame pointer.  */
      fp = (struct frame *) fp->fr_savfp;
      /* sigacthandler frame pointer.  */
      fp = (struct frame *) fp->fr_savfp;

      /* The argument area precedes the struct frame.  */
      handler_args = (struct handler_args *) (fp + 1);
      ucp = &handler_args->ucontext;
      mctx = &ucp->uc_mcontext;
    }
  else
    return _URC_END_OF_STACK;

  new_cfa = mctx->gregs[REG_RSP];

  fs->regs.cfa_how = CFA_REG_OFFSET;
  fs->regs.cfa_reg = 7;
  fs->regs.cfa_offset = new_cfa - (long) context->cfa;

  /* The SVR4 register numbering macros aren't usable in libgcc.  */
  fs->regs.how[0] = REG_SAVED_OFFSET;
  fs->regs.reg[0].loc.offset = (long)&mctx->gregs[REG_RAX] - new_cfa;
  fs->regs.how[1] = REG_SAVED_OFFSET;
  fs->regs.reg[1].loc.offset = (long)&mctx->gregs[REG_RDX] - new_cfa;
  fs->regs.how[2] = REG_SAVED_OFFSET;
  fs->regs.reg[2].loc.offset = (long)&mctx->gregs[REG_RCX] - new_cfa;
  fs->regs.how[3] = REG_SAVED_OFFSET;
  fs->regs.reg[3].loc.offset = (long)&mctx->gregs[REG_RBX] - new_cfa;
  fs->regs.how[4] = REG_SAVED_OFFSET;
  fs->regs.reg[4].loc.offset = (long)&mctx->gregs[REG_RSI] - new_cfa;
  fs->regs.how[5] = REG_SAVED_OFFSET;
  fs->regs.reg[5].loc.offset = (long)&mctx->gregs[REG_RDI] - new_cfa;
  fs->regs.how[6] = REG_SAVED_OFFSET;
  fs->regs.reg[6].loc.offset = (long)&mctx->gregs[REG_RBP] - new_cfa;
  fs->regs.how[8] = REG_SAVED_OFFSET;
  fs->regs.reg[8].loc.offset = (long)&mctx->gregs[REG_R8] - new_cfa;
  fs->regs.how[9] = REG_SAVED_OFFSET;
  fs->regs.reg[9].loc.offset = (long)&mctx->gregs[REG_R9] - new_cfa;
  fs->regs.how[10] = REG_SAVED_OFFSET;
  fs->regs.reg[10].loc.offset = (long)&mctx->gregs[REG_R10] - new_cfa;
  fs->regs.how[11] = REG_SAVED_OFFSET;
  fs->regs.reg[11].loc.offset = (long)&mctx->gregs[REG_R11] - new_cfa;
  fs->regs.how[12] = REG_SAVED_OFFSET;
  fs->regs.reg[12].loc.offset = (long)&mctx->gregs[REG_R12] - new_cfa;
  fs->regs.how[13] = REG_SAVED_OFFSET;
  fs->regs.reg[13].loc.offset = (long)&mctx->gregs[REG_R13] - new_cfa;
  fs->regs.how[14] = REG_SAVED_OFFSET;
  fs->regs.reg[14].loc.offset = (long)&mctx->gregs[REG_R14] - new_cfa;
  fs->regs.how[15] = REG_SAVED_OFFSET;
  fs->regs.reg[15].loc.offset = (long)&mctx->gregs[REG_R15] - new_cfa;
  fs->regs.how[16] = REG_SAVED_OFFSET;
  fs->regs.reg[16].loc.offset = (long)&mctx->gregs[REG_RIP] - new_cfa;
  fs->retaddr_column = 16;
  fs->signal_frame = 1;

  return _URC_NO_REASON;
}

#else

#define MD_FALLBACK_FRAME_STATE_FOR x86_fallback_frame_state

static _Unwind_Reason_Code
x86_fallback_frame_state (struct _Unwind_Context *context,
			  _Unwind_FrameState *fs)
{
  unsigned char *pc = context->ra;
  mcontext_t *mctx;
  long new_cfa;

  if (/* Solaris 11 since snv_125
	   -------------------------
	  <__sighndlr+0>       	push   %ebp
	  <__sighndlr+1>       	mov    %esp,%ebp
	  <__sighndlr+3>       	and    $0xfffffff0,%esp
	  <__sighndlr+6>       	sub    $0x4,%esp
	  <__sighndlr+9>      	pushl  0x10(%ebp)
	  <__sighndlr+12>      	pushl  0xc(%ebp)
	  <__sighndlr+15>      	pushl  0x8(%ebp)
	  <__sighndlr+18>      	call   *0x14(%ebp)
	  <__sighndlr+21>      	leave                <--- PC
	  <__sighndlr+22>      	ret  */
	 (*(unsigned long *)(pc - 21) == 0x83ec8b55
	  && *(unsigned long *)(pc - 17) == 0xec83f0e4
	  && *(unsigned long *)(pc - 13)  == 0x1075ff04
	  && *(unsigned long *)(pc - 9)  == 0xff0c75ff
	  && *(unsigned long *)(pc - 5)  == 0x55ff0875
	  && (*(unsigned long *)(pc - 1) & 0x00ffffff) == 0x00c3c914))
    {
      struct handler_args {
	int signo;
	siginfo_t *sip;
	ucontext_t *ucontext;
      } *handler_args = context->cfa;
      mctx = &handler_args->ucontext->uc_mcontext;
    }
  else
    return _URC_END_OF_STACK;

  new_cfa = mctx->gregs[UESP];

  fs->regs.cfa_how = CFA_REG_OFFSET;
  fs->regs.cfa_reg = 4;
  fs->regs.cfa_offset = new_cfa - (long) context->cfa;

  /* The SVR4 register numbering macros aren't usable in libgcc.  */
  fs->regs.how[0] = REG_SAVED_OFFSET;
  fs->regs.reg[0].loc.offset = (long)&mctx->gregs[EAX] - new_cfa;
  fs->regs.how[3] = REG_SAVED_OFFSET;
  fs->regs.reg[3].loc.offset = (long)&mctx->gregs[EBX] - new_cfa;
  fs->regs.how[1] = REG_SAVED_OFFSET;
  fs->regs.reg[1].loc.offset = (long)&mctx->gregs[ECX] - new_cfa;
  fs->regs.how[2] = REG_SAVED_OFFSET;
  fs->regs.reg[2].loc.offset = (long)&mctx->gregs[EDX] - new_cfa;
  fs->regs.how[6] = REG_SAVED_OFFSET;
  fs->regs.reg[6].loc.offset = (long)&mctx->gregs[ESI] - new_cfa;
  fs->regs.how[7] = REG_SAVED_OFFSET;
  fs->regs.reg[7].loc.offset = (long)&mctx->gregs[EDI] - new_cfa;
  fs->regs.how[5] = REG_SAVED_OFFSET;
  fs->regs.reg[5].loc.offset = (long)&mctx->gregs[EBP] - new_cfa;
  fs->regs.how[8] = REG_SAVED_OFFSET;
  fs->regs.reg[8].loc.offset = (long)&mctx->gregs[EIP] - new_cfa;
  fs->retaddr_column = 8;

  /* SIGFPE for IEEE-754 exceptions is delivered after the faulting insn
     rather than before it, so don't set fs->signal_frame in that case.
     We test whether the ES field of the Status Register is zero.  */
  if ((mctx->fpregs.fp_reg_set.fpchip_state.status & 0x80) == 0)
    fs->signal_frame = 1;

  return _URC_NO_REASON;
}

#endif
Commit	Line	Data
8d232178	1	/* DWARF2 EH unwinding support for AMD x86-64 and x86.
a945c346	2	Copyright (C) 2009-2024 Free Software Foundation, Inc.
8d232178 OH	3
	4	This file is part of GCC.
	5
	6	GCC is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 3, or (at your option)
	9	any later version.
	10
	11	GCC is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	Under Section 7 of GPL version 3, you are granted additional
	17	permissions described in the GCC Runtime Library Exception, version
	18	3.1, as published by the Free Software Foundation.
	19
	20	You should have received a copy of the GNU General Public License and
	21	a copy of the GCC Runtime Library Exception along with this program;
	22	see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
	23	<http://www.gnu.org/licenses/>. */
	24
	25	/* Do code reading to identify a signal frame, and set the frame
	26	state data appropriately. See unwind-dw2.c for the structs. */
	27
	28	#include <ucontext.h>
ea2d8f12	29	#include <sys/frame.h>
8d232178 OH	30
	31	#ifdef __x86_64__
	32
	33	#define MD_FALLBACK_FRAME_STATE_FOR x86_64_fallback_frame_state
	34
	35	static _Unwind_Reason_Code
	36	x86_64_fallback_frame_state (struct _Unwind_Context *context,
	37	_Unwind_FrameState *fs)
	38	{
	39	unsigned char *pc = context->ra;
	40	mcontext_t *mctx;
	41	long new_cfa;
	42
ea2d8f12	43	if (/* Solaris 10+
8d232178 OH	44	------------
	45	<__sighndlr+0>: push %rbp
	46	<__sighndlr+1>: mov %rsp,%rbp
	47	<__sighndlr+4>: callq *%rcx
	48	<__sighndlr+6>: leaveq <--- PC
	49	<__sighndlr+7>: retq */
	50	(unsigned long )(pc - 6) == 0xc3c9d1ffe5894855)
ea2d8f12 RO	51
	52	/* We need to move up three frames:
	53
	54	<signal handler> <-- context->cfa
	55	__sighndlr
	56	call_user_handler
	57	sigacthandler
	58	<kernel>
	59
	60	context->cfa points into the frame after the saved frame pointer and
	61	saved pc (struct frame).
	62
	63	The ucontext_t structure is in the kernel frame after the signal
	64	number and a siginfo_t *. Since the frame sizes vary even within
	65	Solaris 10 updates, we need to walk the stack to get there. */
8d232178	66	{
ea2d8f12 RO	67	struct frame fp = (struct frame ) context->cfa - 1;
	68	struct handler_args {
	69	int signo;
	70	siginfo_t *sip;
	71	ucontext_t ucontext;
	72	} *handler_args;
	73	ucontext_t *ucp;
	74
	75	/* Next frame: __sighndlr frame pointer. */
	76	fp = (struct frame *) fp->fr_savfp;
	77	/* call_user_handler frame pointer. */
	78	fp = (struct frame *) fp->fr_savfp;
	79	/* sigacthandler frame pointer. */
	80	fp = (struct frame *) fp->fr_savfp;
	81
	82	/* The argument area precedes the struct frame. */
	83	handler_args = (struct handler_args *) (fp + 1);
	84	ucp = &handler_args->ucontext;
	85	mctx = &ucp->uc_mcontext;
8d232178 OH	86	}
	87	else
	88	return _URC_END_OF_STACK;
	89
	90	new_cfa = mctx->gregs[REG_RSP];
	91
	92	fs->regs.cfa_how = CFA_REG_OFFSET;
	93	fs->regs.cfa_reg = 7;
	94	fs->regs.cfa_offset = new_cfa - (long) context->cfa;
	95
	96	/* The SVR4 register numbering macros aren't usable in libgcc. */
146e4591	97	fs->regs.how[0] = REG_SAVED_OFFSET;
8d232178	98	fs->regs.reg[0].loc.offset = (long)&mctx->gregs[REG_RAX] - new_cfa;
146e4591	99	fs->regs.how[1] = REG_SAVED_OFFSET;
8d232178	100	fs->regs.reg[1].loc.offset = (long)&mctx->gregs[REG_RDX] - new_cfa;
146e4591	101	fs->regs.how[2] = REG_SAVED_OFFSET;
8d232178	102	fs->regs.reg[2].loc.offset = (long)&mctx->gregs[REG_RCX] - new_cfa;
146e4591	103	fs->regs.how[3] = REG_SAVED_OFFSET;
8d232178	104	fs->regs.reg[3].loc.offset = (long)&mctx->gregs[REG_RBX] - new_cfa;
146e4591	105	fs->regs.how[4] = REG_SAVED_OFFSET;
8d232178	106	fs->regs.reg[4].loc.offset = (long)&mctx->gregs[REG_RSI] - new_cfa;
146e4591	107	fs->regs.how[5] = REG_SAVED_OFFSET;
8d232178	108	fs->regs.reg[5].loc.offset = (long)&mctx->gregs[REG_RDI] - new_cfa;
146e4591	109	fs->regs.how[6] = REG_SAVED_OFFSET;
8d232178	110	fs->regs.reg[6].loc.offset = (long)&mctx->gregs[REG_RBP] - new_cfa;
146e4591	111	fs->regs.how[8] = REG_SAVED_OFFSET;
8d232178	112	fs->regs.reg[8].loc.offset = (long)&mctx->gregs[REG_R8] - new_cfa;
146e4591	113	fs->regs.how[9] = REG_SAVED_OFFSET;
8d232178	114	fs->regs.reg[9].loc.offset = (long)&mctx->gregs[REG_R9] - new_cfa;
146e4591	115	fs->regs.how[10] = REG_SAVED_OFFSET;
8d232178	116	fs->regs.reg[10].loc.offset = (long)&mctx->gregs[REG_R10] - new_cfa;
146e4591	117	fs->regs.how[11] = REG_SAVED_OFFSET;
8d232178	118	fs->regs.reg[11].loc.offset = (long)&mctx->gregs[REG_R11] - new_cfa;
146e4591	119	fs->regs.how[12] = REG_SAVED_OFFSET;
8d232178	120	fs->regs.reg[12].loc.offset = (long)&mctx->gregs[REG_R12] - new_cfa;
146e4591	121	fs->regs.how[13] = REG_SAVED_OFFSET;
8d232178	122	fs->regs.reg[13].loc.offset = (long)&mctx->gregs[REG_R13] - new_cfa;
146e4591	123	fs->regs.how[14] = REG_SAVED_OFFSET;
8d232178	124	fs->regs.reg[14].loc.offset = (long)&mctx->gregs[REG_R14] - new_cfa;
146e4591	125	fs->regs.how[15] = REG_SAVED_OFFSET;
8d232178	126	fs->regs.reg[15].loc.offset = (long)&mctx->gregs[REG_R15] - new_cfa;
146e4591	127	fs->regs.how[16] = REG_SAVED_OFFSET;
8d232178 OH	128	fs->regs.reg[16].loc.offset = (long)&mctx->gregs[REG_RIP] - new_cfa;
	129	fs->retaddr_column = 16;
	130	fs->signal_frame = 1;
	131
	132	return _URC_NO_REASON;
	133	}
	134
	135	#else
	136
	137	#define MD_FALLBACK_FRAME_STATE_FOR x86_fallback_frame_state
	138
	139	static _Unwind_Reason_Code
	140	x86_fallback_frame_state (struct _Unwind_Context *context,
	141	_Unwind_FrameState *fs)
	142	{
	143	unsigned char *pc = context->ra;
	144	mcontext_t *mctx;
	145	long new_cfa;
	146
ccd1242e	147	if (/* Solaris 11 since snv_125
ea2d8f12 RO	148	-------------------------
	149	<__sighndlr+0> push %ebp
	150	<__sighndlr+1> mov %esp,%ebp
	151	<__sighndlr+3> and $0xfffffff0,%esp
	152	<__sighndlr+6> sub $0x4,%esp
	153	<__sighndlr+9> pushl 0x10(%ebp)
	154	<__sighndlr+12> pushl 0xc(%ebp)
	155	<__sighndlr+15> pushl 0x8(%ebp)
	156	<__sighndlr+18> call *0x14(%ebp)
	157	<__sighndlr+21> leave <--- PC
	158	<__sighndlr+22> ret */
	159	((unsigned long )(pc - 21) == 0x83ec8b55
	160	&& (unsigned long )(pc - 17) == 0xec83f0e4
	161	&& (unsigned long )(pc - 13) == 0x1075ff04
	162	&& (unsigned long )(pc - 9) == 0xff0c75ff
	163	&& (unsigned long )(pc - 5) == 0x55ff0875
	164	&& ((unsigned long )(pc - 1) & 0x00ffffff) == 0x00c3c914))
8d232178 OH	165	{
	166	struct handler_args {
	167	int signo;
	168	siginfo_t *sip;
	169	ucontext_t *ucontext;
	170	} *handler_args = context->cfa;
	171	mctx = &handler_args->ucontext->uc_mcontext;
	172	}
	173	else
	174	return _URC_END_OF_STACK;
	175
	176	new_cfa = mctx->gregs[UESP];
	177
	178	fs->regs.cfa_how = CFA_REG_OFFSET;
	179	fs->regs.cfa_reg = 4;
	180	fs->regs.cfa_offset = new_cfa - (long) context->cfa;
	181
	182	/* The SVR4 register numbering macros aren't usable in libgcc. */
146e4591	183	fs->regs.how[0] = REG_SAVED_OFFSET;
8d232178	184	fs->regs.reg[0].loc.offset = (long)&mctx->gregs[EAX] - new_cfa;
146e4591	185	fs->regs.how[3] = REG_SAVED_OFFSET;
8d232178	186	fs->regs.reg[3].loc.offset = (long)&mctx->gregs[EBX] - new_cfa;
146e4591	187	fs->regs.how[1] = REG_SAVED_OFFSET;
8d232178	188	fs->regs.reg[1].loc.offset = (long)&mctx->gregs[ECX] - new_cfa;
146e4591	189	fs->regs.how[2] = REG_SAVED_OFFSET;
8d232178	190	fs->regs.reg[2].loc.offset = (long)&mctx->gregs[EDX] - new_cfa;
146e4591	191	fs->regs.how[6] = REG_SAVED_OFFSET;
8d232178	192	fs->regs.reg[6].loc.offset = (long)&mctx->gregs[ESI] - new_cfa;
146e4591	193	fs->regs.how[7] = REG_SAVED_OFFSET;
8d232178	194	fs->regs.reg[7].loc.offset = (long)&mctx->gregs[EDI] - new_cfa;
146e4591	195	fs->regs.how[5] = REG_SAVED_OFFSET;
8d232178	196	fs->regs.reg[5].loc.offset = (long)&mctx->gregs[EBP] - new_cfa;
146e4591	197	fs->regs.how[8] = REG_SAVED_OFFSET;
8d232178 OH	198	fs->regs.reg[8].loc.offset = (long)&mctx->gregs[EIP] - new_cfa;
8d232178 OH	199	fs->retaddr_column = 8;
0ba045df EB	200
	201	/* SIGFPE for IEEE-754 exceptions is delivered after the faulting insn
	202	rather than before it, so don't set fs->signal_frame in that case.
	203	We test whether the ES field of the Status Register is zero. */
	204	if ((mctx->fpregs.fp_reg_set.fpchip_state.status & 0x80) == 0)
	205	fs->signal_frame = 1;
8d232178 OH	206
	207	return _URC_NO_REASON;
	208	}
	209
	210	#endif