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688903eb | 1 | /* Copyright (C) 2001-2018 Free Software Foundation, Inc. |
98b1e6c8 UD |
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 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
98b1e6c8 UD |
17 | |
18 | #include <sysdep.h> | |
19 | #include <jmpbuf-offsets.h> | |
20 | #include <asm-syntax.h> | |
8422c9a5 | 21 | #include <stap-probe.h> |
98b1e6c8 | 22 | |
85736dc7 L |
23 | #include <sigaltstack-offsets.h> |
24 | ||
98b1e6c8 UD |
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 | ||
32 | //#define __longjmp ____longjmp_chk | |
33 | ||
34 | #ifdef PIC | |
85736dc7 | 35 | # define CALL_FAIL sub $8, %RSP_LP; \ |
e451d22b AS |
36 | cfi_remember_state; \ |
37 | cfi_def_cfa_offset(16); \ | |
85736dc7 | 38 | lea longjmp_msg(%rip), %RDI_LP; \ |
b402e91a | 39 | call HIDDEN_JUMPTARGET(__fortify_fail); \ |
e451d22b AS |
40 | nop; \ |
41 | cfi_restore_state | |
98b1e6c8 | 42 | #else |
85736dc7 | 43 | # define CALL_FAIL sub $8, %RSP_LP; \ |
e451d22b AS |
44 | cfi_remember_state; \ |
45 | cfi_def_cfa_offset(16); \ | |
85736dc7 | 46 | mov $longjmp_msg, %RDI_LP; \ |
b402e91a | 47 | call HIDDEN_JUMPTARGET(__fortify_fail); \ |
e451d22b AS |
48 | nop; \ |
49 | cfi_restore_state | |
98b1e6c8 UD |
50 | #endif |
51 | ||
98b1e6c8 UD |
52 | /* Jump to the position specified by ENV, causing the |
53 | setjmp call there to return VAL, or 1 if VAL is 0. | |
54 | void __longjmp (__jmp_buf env, int val). */ | |
55 | .text | |
56 | ENTRY(____longjmp_chk) | |
57 | /* Restore registers. */ | |
85736dc7 | 58 | mov (JB_RSP*8)(%rdi), %R8_LP |
6c7fb145 | 59 | mov (JB_RBP*8)(%rdi),%R9_LP |
85736dc7 | 60 | mov (JB_PC*8)(%rdi), %RDX_LP |
98b1e6c8 | 61 | #ifdef PTR_DEMANGLE |
85736dc7 | 62 | PTR_DEMANGLE (%R8_LP) |
6c7fb145 | 63 | PTR_DEMANGLE (%R9_LP) |
85736dc7 | 64 | PTR_DEMANGLE (%RDX_LP) |
6c7fb145 RM |
65 | # ifdef __ILP32__ |
66 | /* We ignored the high bits of the %rbp value because only the low | |
67 | bits are mangled. But we cannot presume that %rbp is being used | |
68 | as a pointer and truncate it, so recover the high bits. */ | |
69 | movl (JB_RBP*8 + 4)(%rdi), %eax | |
70 | shlq $32, %rax | |
71 | orq %rax, %r9 | |
72 | # endif | |
98b1e6c8 UD |
73 | #endif |
74 | ||
85736dc7 | 75 | cmp %R8_LP, %RSP_LP |
e4143e7a UD |
76 | jbe .Lok |
77 | ||
98b1e6c8 UD |
78 | /* Save function parameters. */ |
79 | movq %rdi, %r10 | |
c044aa75 CLT |
80 | cfi_register (%rdi, %r10) |
81 | movl %esi, %ebx | |
82 | cfi_register (%rsi, %rbx) | |
98b1e6c8 | 83 | |
98b1e6c8 | 84 | xorl %edi, %edi |
85736dc7 | 85 | lea -sizeSS(%rsp), %RSI_LP |
98b1e6c8 UD |
86 | movl $__NR_sigaltstack, %eax |
87 | syscall | |
e4143e7a | 88 | /* Without working sigaltstack we cannot perform the test. */ |
98b1e6c8 | 89 | testl %eax, %eax |
e4143e7a | 90 | jne .Lok2 |
85736dc7 | 91 | testl $1, (-sizeSS + oSS_FLAGS)(%rsp) |
e4143e7a | 92 | jz .Lfail |
98b1e6c8 | 93 | |
85736dc7 L |
94 | mov (-sizeSS + oSS_SP)(%rsp), %RAX_LP |
95 | add (-sizeSS + oSS_SIZE)(%rsp), %RAX_LP | |
96 | sub %R8_LP, %RAX_LP | |
97 | cmp (-sizeSS + oSS_SIZE)(%rsp), %RAX_LP | |
e4143e7a UD |
98 | jae .Lok2 |
99 | ||
100 | .Lfail: CALL_FAIL | |
101 | ||
102 | .Lok2: movq %r10, %rdi | |
c044aa75 CLT |
103 | cfi_restore (%rdi) |
104 | movl %ebx, %esi | |
105 | cfi_restore (%rsi) | |
e4143e7a | 106 | |
8422c9a5 RM |
107 | .Lok: |
108 | LIBC_PROBE (longjmp, 3, LP_SIZE@%RDI_LP, -4@%esi, LP_SIZE@%RDX_LP) | |
109 | /* We add unwind information for the target here. */ | |
e4143e7a | 110 | cfi_def_cfa(%rdi, 0) |
98b1e6c8 UD |
111 | cfi_register(%rsp,%r8) |
112 | cfi_register(%rbp,%r9) | |
113 | cfi_register(%rip,%rdx) | |
114 | cfi_offset(%rbx,JB_RBX*8) | |
115 | cfi_offset(%r12,JB_R12*8) | |
116 | cfi_offset(%r13,JB_R13*8) | |
117 | cfi_offset(%r14,JB_R14*8) | |
118 | cfi_offset(%r15,JB_R15*8) | |
c044aa75 CLT |
119 | movq (JB_RBX*8)(%rdi), %rbx |
120 | movq (JB_R12*8)(%rdi), %r12 | |
121 | movq (JB_R13*8)(%rdi), %r13 | |
122 | movq (JB_R14*8)(%rdi), %r14 | |
123 | movq (JB_R15*8)(%rdi), %r15 | |
98b1e6c8 | 124 | /* Set return value for setjmp. */ |
e4143e7a | 125 | movl %esi, %eax |
85736dc7 | 126 | mov %R8_LP, %RSP_LP |
e4143e7a | 127 | movq %r9,%rbp |
8422c9a5 RM |
128 | LIBC_PROBE (longjmp_target, 3, |
129 | LP_SIZE@%RDI_LP, -4@%eax, LP_SIZE@%RDX_LP) | |
98b1e6c8 | 130 | jmpq *%rdx |
9663bb3e | 131 | END (____longjmp_chk) |