1/* Copyright (C) 2009-2021 Free Software Foundation, Inc.
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
15   License along with the GNU C Library; if not, see
16   <https://www.gnu.org/licenses/>.  */
17
18#include <sysdep.h>
19#include <rtld-global-offsets.h>
20
21	.section .rodata.str1.8,"aMS",@progbits,1
22	.align 3
23.LC0:
24	.string "longjmp causes uninitialized stack frame"
25	.section .toc,"aw"
26.LC1:
27	.tc .LC0[TC],.LC0
28	.text
29
30#define __longjmp ____longjmp_chk
31
32#define CHECK_SP(reg) \
33	cmpld	reg, r1;				\
34	bge+	.Lok;					\
35	mflr	r0;					\
36	std	r0,FRAME_LR_SAVE(r1);			\
37	mr	r31,r3;					\
38	mr	r30,r4;					\
39	stdu	r1,-FRAME_MIN_SIZE-32(r1);		\
40	cfi_remember_state;				\
41	cfi_adjust_cfa_offset (FRAME_MIN_SIZE+32);	\
42	cfi_offset (lr, FRAME_LR_SAVE);			\
43	li	r3,0;					\
44	addi	r4,r1,FRAME_MIN_SIZE;			\
45	li	r0,__NR_sigaltstack;			\
46	sc;						\
47	/* Without working sigaltstack we cannot perform the test.  */ \
48	bso	.Lok2;					\
49	lwz	r0,FRAME_MIN_SIZE+8(r1);		\
50	andi.	r4,r0,1;				\
51	beq	.Lfail;					\
52	ld	r0,FRAME_MIN_SIZE+16(r1);		\
53	ld	r4,FRAME_MIN_SIZE(r1);			\
54	add	r4,r4,r0;				\
55	sub	r3,r3,reg;				\
56	cmpld	r3,r0;					\
57	bge+	.Lok2;					\
58.Lfail:							\
59	ld	r3,.LC1@toc(2);				\
60	bl	HIDDEN_JUMPTARGET (__fortify_fail);	\
61	nop;						\
62.Lok2:							\
63	mr	r3,r31;					\
64	mr	r4,r30;					\
65	cfi_restore_state;				\
66.Lok:
67
68#include <__longjmp-common.S>
69