/* setjmp for i386.

   Copyright (C) 1995-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <sysdep.h>

#include <jmpbuf-offsets.h>

#include <jmp_buf-ssp.h>

#include <asm-syntax.h>

#include <stap-probe.h>

#define PARMS	4		/* no space for saved regs */

#define JMPBUF	PARMS

#define SIGMSK	JMPBUF+4

/* Don't save shadow stack register if shadow stack isn't enabled.  */

#if !SHSTK_ENABLED

# undef SHADOW_STACK_POINTER_OFFSET

#endif

ENTRY (__sigsetjmp)

	movl JMPBUF(%esp), %eax

	/* Save registers.  */

	movl %ebx, (JB_BX*4)(%eax)

	movl %esi, (JB_SI*4)(%eax)

	movl %edi, (JB_DI*4)(%eax)

	leal JMPBUF(%esp), %ecx	/* Save SP as it will be after we return.  */

#ifdef PTR_MANGLE

	PTR_MANGLE (%ecx)

#endif

	movl %ecx, (JB_SP*4)(%eax)

	movl 0(%esp), %ecx	/* Save PC we are returning to now.  */

	LIBC_PROBE (setjmp, 3, 4@%eax, -4@SIGMSK(%esp), 4@%ecx)

#ifdef PTR_MANGLE

	PTR_MANGLE (%ecx)

#endif

	movl %ecx, (JB_PC*4)(%eax)

	movl %ebp, (JB_BP*4)(%eax) /* Save caller's frame pointer.  */

#ifdef SHADOW_STACK_POINTER_OFFSET

# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET

	/* Check if Shadow Stack is enabled.  */

	testl $X86_FEATURE_1_SHSTK, %gs:FEATURE_1_OFFSET

	jz L(skip_ssp)

# else

	xorl %ecx, %ecx

# endif

	/* Get the current Shadow-Stack-Pointer and save it.  */

	rdsspd %ecx

	movl %ecx, SHADOW_STACK_POINTER_OFFSET(%eax)

# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET

L(skip_ssp):

# endif

#endif

#if IS_IN (rtld)

	/* In ld.so we never save the signal mask.  */

	xorl %eax, %eax

	ret

#else

	/* Make a tail call to __sigjmp_save; it takes the same args.  */

	jmp __sigjmp_save

#endif

END (__sigsetjmp)

hidden_def (__sigsetjmp)