[thirdparty/glibc.git] / sysdeps / unix / sysv / linux / sparc / sparc32 / ____longjmp_chk.S

/* Copyright (C) 2009-2024 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
   <https://www.gnu.org/licenses/>.  */

#include <sysdep.h>
#include <pointer_guard.h>
#include <jmpbuf-offsets.h>

#define ENV(base,reg) [%base + (reg * 4)]
#define ST_FLUSH_WINDOWS 3

.section .rodata.str1.1,"aMS",@progbits,1
	.type	longjmp_msg,@object
longjmp_msg:
	.string "longjmp causes uninitialized stack frame"
	.size	longjmp_msg, .-longjmp_msg

	.text
ENTRY (____longjmp_chk)
	ld	ENV(o0,JB_SP), %g5
#ifdef PTR_DEMANGLE
	PTR_DEMANGLE (%g5, %g5, %g4)
#endif

	cmp	%sp, %g5
	bleu	.Lok_norestore
	 nop

	save	%sp, -80, %sp
	cfi_remember_state
	cfi_def_cfa_register(%fp)
	cfi_window_save
	cfi_register(%o7, %i7)

	clr	%o0
	add	%sp, 64, %o1
	LOADSYSCALL(sigaltstack)
	ta	0x10
	bcs	.Lok
	 ld	[%sp + 64 + 4], %o2
	andcc	%o2, 0x1, %g0
	be	.Lfail
	 ld	[%sp + 64 + 0], %o0

	ld	[%sp + 64 + 8], %o1
	add	%o0, %o1, %o0
	sub	%o0, %g5, %o0
	cmp	%o0, %o1
	bgeu	.Lok
	 nop

.Lfail:
#ifndef PIC
	sethi	%hi(longjmp_msg), %o0
	or	%o0, %lo(longjmp_msg), %o0
#else
	SETUP_PIC_REG(l7)
	sethi	%gdop_hix22(longjmp_msg), %o0
	xor	%o0, %gdop_lox10(longjmp_msg), %o0
	ld	[%l7 + %o0], %o0, %gdop(longjmp_msg)
#endif
	call	HIDDEN_JUMPTARGET(__fortify_fail)
	 nop

.Lok:
	restore
	cfi_restore_state

.Lok_norestore:
	ld	ENV(o0,JB_FP), %g3	/* Cache target FP in register %g3.  */
#ifdef PTR_DEMANGLE
	PTR_DEMANGLE2 (%g3, %g3, %g4)
#endif

	mov %o0, %g1		/* ENV in %g1 */
	orcc %o1, %g0, %g2	/* VAL in %g2 */
	be,a 0f			/* Branch if zero; else skip delay slot.  */
	 mov 1, %g2		/* Delay slot only hit if zero: VAL = 1.  */
0:

	save	%sp, -96, %sp
	/*
	 * Do a "flush register windows trap".  The trap handler in the
	 * kernel writes all the register windows to their stack slots, and
	 * marks them all as invalid (needing to be sucked up from the
	 * stack when used).  This ensures that all information needed to
	 * unwind to these callers is in memory, not in the register
	 * windows.
	 */
	ta	ST_FLUSH_WINDOWS
#ifdef PTR_DEMANGLE
	ld	ENV(g1,JB_PC), %g1 /* Set return PC. */
	PTR_DEMANGLE2 (%i7, %g1, %g4)
#else
	ld	ENV(g1,JB_PC), %i7 /* Set return PC. */
#endif
	mov	%g5, %fp
	jmp	%i7 + 8
	 restore %g2, 0, %o0	/* Restore values from above register frame. */

END(____longjmp_chk)
Commit	Line	Data
dff8da6b	1	/* Copyright (C) 2009-2024 Free Software Foundation, Inc.
a0902db9 DM	2	This file is part of the GNU C Library.
	3
	4	The GNU C Library is free software; you can redistribute it and/or
	5	modify it under the terms of the GNU Lesser General Public
	6	License as published by the Free Software Foundation; either
	7	version 2.1 of the License, or (at your option) any later version.
	8
	9	The GNU C Library is distributed in the hope that it will be useful,
	10	but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	12	Lesser General Public License for more details.
	13
	14	You should have received a copy of the GNU Lesser General Public
59ba27a6	15	License along with the GNU C Library; if not, see
5a82c748	16	<https://www.gnu.org/licenses/>. */
a0902db9 DM	17
a0902db9 DM	18	#include <sysdep.h>
88f4b692	19	#include <pointer_guard.h>
a0902db9 DM	20	#include <jmpbuf-offsets.h>
	21
	22	#define ENV(base,reg) [%base + (reg * 4)]
	23	#define ST_FLUSH_WINDOWS 3
a0902db9 DM	24
	25	.section .rodata.str1.1,"aMS",@progbits,1
	26	.type longjmp_msg,@object
	27	longjmp_msg:
	28	.string "longjmp causes uninitialized stack frame"
	29	.size longjmp_msg, .-longjmp_msg
	30
	31	.text
	32	ENTRY (____longjmp_chk)
	33	ld ENV(o0,JB_SP), %g5
	34	#ifdef PTR_DEMANGLE
	35	PTR_DEMANGLE (%g5, %g5, %g4)
	36	#endif
	37
	38	cmp %sp, %g5
	39	bleu .Lok_norestore
	40	nop
	41
	42	save %sp, -80, %sp
25ad0df1 DM	43	cfi_remember_state
	44	cfi_def_cfa_register(%fp)
	45	cfi_window_save
	46	cfi_register(%o7, %i7)
a0902db9 DM	47
	48	clr %o0
	49	add %sp, 64, %o1
25ad0df1	50	LOADSYSCALL(sigaltstack)
a0902db9 DM	51	ta 0x10
	52	bcs .Lok
	53	ld [%sp + 64 + 4], %o2
	54	andcc %o2, 0x1, %g0
	55	be .Lfail
	56	ld [%sp + 64 + 0], %o0
	57
	58	ld [%sp + 64 + 8], %o1
	59	add %o0, %o1, %o0
25ad0df1 DM	60	sub %o0, %g5, %o0
25ad0df1 DM	61	cmp %o0, %o1
a0902db9 DM	62	bgeu .Lok
	63	nop
	64
	65	.Lfail:
3d2b3019 DM	66	#ifndef PIC
	67	sethi %hi(longjmp_msg), %o0
	68	or %o0, %lo(longjmp_msg), %o0
	69	#else
	70	SETUP_PIC_REG(l7)
3d2b3019 DM	71	sethi %gdop_hix22(longjmp_msg), %o0
	72	xor %o0, %gdop_lox10(longjmp_msg), %o0
	73	ld [%l7 + %o0], %o0, %gdop(longjmp_msg)
a0902db9 DM	74	#endif
	75	call HIDDEN_JUMPTARGET(__fortify_fail)
	76	nop
	77
	78	.Lok:
	79	restore
25ad0df1	80	cfi_restore_state
a0902db9 DM	81
	82	.Lok_norestore:
	83	ld ENV(o0,JB_FP), %g3 /* Cache target FP in register %g3. */
	84	#ifdef PTR_DEMANGLE
	85	PTR_DEMANGLE2 (%g3, %g3, %g4)
	86	#endif
	87
	88	mov %o0, %g1 /* ENV in %g1 */
	89	orcc %o1, %g0, %g2 /* VAL in %g2 */
	90	be,a 0f /* Branch if zero; else skip delay slot. */
	91	mov 1, %g2 /* Delay slot only hit if zero: VAL = 1. */
	92	0:
	93
c0e70b25	94	save %sp, -96, %sp
a0902db9 DM	95	/*
	96	* Do a "flush register windows trap". The trap handler in the
	97	* kernel writes all the register windows to their stack slots, and
	98	* marks them all as invalid (needing to be sucked up from the
	99	* stack when used). This ensures that all information needed to
	100	* unwind to these callers is in memory, not in the register
	101	* windows.
	102	*/
	103	ta ST_FLUSH_WINDOWS
	104	#ifdef PTR_DEMANGLE
	105	ld ENV(g1,JB_PC), %g1 /* Set return PC. */
c0e70b25	106	PTR_DEMANGLE2 (%i7, %g1, %g4)
a0902db9	107	#else
c0e70b25	108	ld ENV(g1,JB_PC), %i7 /* Set return PC. */
a0902db9 DM	109	#endif
a0902db9 DM	110	mov %g5, %fp
c0e70b25	111	jmp %i7 + 8
a0902db9 DM	112	restore %g2, 0, %o0 /* Restore values from above register frame. */
	113
	114	END(____longjmp_chk)