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.str1.4,"aMS",@progbits,1
22	.align 2
23.LC0:
24	.string "longjmp causes uninitialized stack frame"
25	.text
26
27#define __longjmp_symbol ____longjmp_chk
28
29#ifdef PIC
30#  define LOAD_ARG \
31	SETUP_GOT_ACCESS(r3,got_label2);			\
32	addis	r3,r3,_GLOBAL_OFFSET_TABLE_-got_label2@ha;	\
33	addi	r3,r3,_GLOBAL_OFFSET_TABLE_-got_label2@l;	\
34	lwz	r3,.LC0@got(r3)
35#else
36# define LOAD_ARG \
37	lis	r3,.LC0@ha;				\
38	la	r3,.LC0@l(r3)
39#endif
40
41#define CHECK_SP(reg) \
42	cmplw	reg, r1;				\
43	bge+	.Lok;					\
44	mflr	r0;					\
45	stwu	r1,-32(r1);				\
46	cfi_remember_state;				\
47	cfi_adjust_cfa_offset (32);			\
48	stw	r0,36(r1);				\
49	cfi_offset (lr, 4);				\
50	mr	r31,r3;					\
51	mr	r30,r4;					\
52	li	r3,0;					\
53	addi	r4,r1,8;				\
54	li	r0,__NR_sigaltstack;			\
55	sc;						\
56	/* Without working sigaltstack we cannot perform the test.  */ \
57	bso	.Lok2;					\
58	lwz	r0,12(r1);				\
59	andi.	r3,r0,1;				\
60	beq	.Lfail;					\
61	lwz	r0,16(r1);				\
62	lwz	r3,8(r1);				\
63	add	r3,r3,r0;				\
64	sub	r3,r3,reg;				\
65	cmplw	r3,r0;					\
66	bge+	.Lok2;					\
67.Lfail:							\
68	LOAD_ARG;					\
69	bl	HIDDEN_JUMPTARGET (__fortify_fail);	\
70.Lok2:							\
71	mr	r3,r31;					\
72	mr	r4,r30;					\
73	cfi_restore_state;				\
74.Lok:
75
76#include <__longjmp-common.S>
77