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
20#include <sigaltstack-offsets.h>
21
22	.section .rodata.str1.1,"aMS",@progbits,1
23	.type	longjmp_msg,@object
24longjmp_msg:
25	.string "longjmp causes uninitialized stack frame"
26	.size	longjmp_msg, .-longjmp_msg
27	.text
28
29#define __longjmp ____longjmp_chk
30
31#ifdef PIC
32# define CALL_FAIL \
33	mov.l	.Lfail, r1;				\
34	mov.l	.Lstr, r4;				\
35	mov.l	r12, @-r15;				\
36	cfi_remember_state;				\
37	cfi_adjust_cfa_offset (4);			\
38	cfi_rel_offset (r12, 0);			\
39	mova	.Lgot, r0;				\
40	mov.l	.Lgot, r12;				\
41	add	r0, r12;				\
42	sts.l	pr, @-r15;				\
43	cfi_adjust_cfa_offset (4);			\
44	cfi_rel_offset (pr, 0);				\
45	bsrf	r1;					\
46	 add	r12, r4;				\
47.Lfail0:						\
48	/* Unreachable.	 */				\
49	.align	2;					\
50.Lgot:							\
51	.long	_GLOBAL_OFFSET_TABLE_;			\
52.Lstr:							\
53	.long	longjmp_msg@GOTOFF;			\
54.Lfail:							\
55	.long	__GI___fortify_fail@PLT-(.Lfail0-.);	\
56	cfi_restore_state;
57#else
58# define CALL_FAIL \
59	mov.l	.Lfail, r1;				\
60	mov.l	.Lstr, r4;				\
61	sts.l	pr, @-r15;				\
62	cfi_remember_state;				\
63	cfi_adjust_cfa_offset (4);			\
64	cfi_rel_offset (pr, 0);				\
65	jsr	@r1;					\
66	 nop;						\
67	/* Unreachable.	 */				\
68	.align	2;					\
69.Lstr:							\
70	.long	longjmp_msg;				\
71.Lfail:							\
72	.long	__fortify_fail;				\
73	cfi_restore_state;
74#endif
75
76#define CHECK_SP(reg) \
77	/* Jumping to a higher-address frame is always allowed.	 */	\
78	cmp/hs	r15, reg;						\
79	bt	.Lok;							\
80									\
81	mov.l	r0, @-r15; /* The return value is already in here.  */	\
82	cfi_adjust_cfa_offset (4);					\
83	mov.l	r1, @-r15; /* PTR_DEMANGLE helper.  */			\
84	cfi_adjust_cfa_offset (4);					\
85	mov.l	r2, @-r15; /* The new SP value is already in here.  */	\
86	cfi_adjust_cfa_offset (4);					\
87	mov.l	r4, @-r15; /* We'll still need this one.  */		\
88	cfi_adjust_cfa_offset (4);					\
89	add	#-sizeSS, r15;						\
90	cfi_adjust_cfa_offset (sizeSS);					\
91	mov	#0, r4;							\
92	mov	r15, r5;						\
93	DO_CALL (sigaltstack, 2);					\
94	/* Without working sigaltstack we cannot perform the test.  */	\
95	tst	r0, r0;							\
96	bf	.Lok2;							\
97	mov.l	@(oSS_FLAGS, r15), r0;					\
98	tst	#SS_ONSTACK, r0;					\
99	bt	.Lcall_fail;						\
100	mov.l	@(oSS_SIZE, r15), r2;					\
101	mov.l	@(oSS_SP, r15), r1;					\
102	add	r2, r1;							\
103	sub	r8, r1;							\
104	cmp/hi	r1, r2;							\
105	bf	.Lok2;							\
106.Lcall_fail:								\
107	CALL_FAIL							\
108									\
109.Lok2:									\
110	add	#sizeSS, r15;						\
111	cfi_adjust_cfa_offset (-sizeSS);				\
112	mov.l	@r15+, r4;						\
113	cfi_adjust_cfa_offset (-4);					\
114	mov.l	@r15+, r2;						\
115	cfi_adjust_cfa_offset (-4);					\
116	mov.l	@r15+, r1;						\
117	cfi_adjust_cfa_offset (-4);					\
118	mov.l	@r15+, r0;						\
119	cfi_adjust_cfa_offset (-4);					\
120.Lok:
121
122#include <__longjmp.S>
123