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04277e02 | 1 | /* Copyright (C) 1992-2019 Free Software Foundation, Inc. |
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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 | |
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15 | License along with the GNU C Library. If not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
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17 | |
18 | #include <sysdep.h> | |
19 | #include <jmpbuf-offsets.h> | |
20 | ||
21 | ||
22 | .section .rodata.str1.1,"aMS",@progbits,1 | |
23 | .type longjmp_msg,@object | |
24 | longjmp_msg: | |
25 | .string "longjmp causes uninitialized stack frame" | |
26 | .size longjmp_msg, .-longjmp_msg | |
27 | ||
28 | ||
29 | /* Jump to the position specified by ENV, causing the | |
30 | setjmp call there to return VAL, or 1 if VAL is 0. | |
31 | void __longjmp (__jmp_buf env, int val). */ | |
32 | .text | |
33 | .align 4 | |
34 | .globl ____longjmp_chk | |
35 | .type ____longjmp_chk, @function | |
36 | .usepv ____longjmp_chk, std | |
37 | ||
38 | cfi_startproc | |
39 | ____longjmp_chk: | |
40 | ldgp gp, 0(pv) | |
41 | #ifdef PROF | |
42 | .set noat | |
43 | lda AT, _mcount | |
44 | jsr AT, (AT), _mcount | |
45 | .set at | |
46 | #endif | |
47 | ||
48 | ldq s2, JB_PC*8(a0) | |
49 | mov a0, s0 | |
50 | ldq fp, JB_FP*8(a0) | |
51 | mov a1, s1 | |
52 | ldq s3, JB_SP*8(a0) | |
53 | cmoveq s1, 1, s1 | |
54 | ||
55 | #ifdef PTR_DEMANGLE | |
56 | PTR_DEMANGLE(s2, t1) | |
57 | PTR_DEMANGLE2(s3, t1) | |
58 | PTR_DEMANGLE2(fp, t1) | |
59 | #endif | |
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60 | /* ??? While this is a proper test for detecting a longjmp to an |
61 | invalid frame within any given stack, the main thread stack is | |
62 | located *below* almost everything in the address space. Which | |
63 | means that the test at Lfail vs the signal stack will almost | |
64 | certainly never pass. We ought bounds check top and bottom of | |
65 | the current thread's stack. */ | |
66 | cmpule s3, sp, t1 | |
67 | bne t1, $Lfail | |
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68 | |
69 | .align 4 | |
39262cc8 | 70 | $Lok: |
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71 | mov s0, a0 |
72 | mov s1, v0 | |
73 | mov s3, t0 | |
74 | mov s2, ra | |
75 | cfi_remember_state | |
76 | cfi_def_cfa(a0, 0) | |
77 | cfi_register(sp, t0) | |
78 | cfi_offset(s0, JB_S0*8) | |
79 | cfi_offset(s1, JB_S1*8) | |
80 | cfi_offset(s2, JB_S2*8) | |
81 | cfi_offset(s3, JB_S3*8) | |
82 | cfi_offset(s4, JB_S4*8) | |
83 | cfi_offset(s5, JB_S5*8) | |
84 | cfi_offset(s3, JB_S3*8) | |
85 | cfi_offset($f2, JB_F2*8) | |
86 | cfi_offset($f3, JB_F3*8) | |
87 | cfi_offset($f4, JB_F4*8) | |
88 | cfi_offset($f5, JB_F5*8) | |
89 | cfi_offset($f6, JB_F6*8) | |
90 | cfi_offset($f7, JB_F7*8) | |
91 | cfi_offset($f8, JB_F8*8) | |
92 | cfi_offset($f9, JB_F9*8) | |
93 | ldq s0, JB_S0*8(a0) | |
94 | ldq s1, JB_S1*8(a0) | |
95 | ldq s2, JB_S2*8(a0) | |
96 | ldq s3, JB_S3*8(a0) | |
97 | ldq s4, JB_S4*8(a0) | |
98 | ldq s5, JB_S5*8(a0) | |
99 | ldt $f2, JB_F2*8(a0) | |
100 | ldt $f3, JB_F3*8(a0) | |
101 | ldt $f4, JB_F4*8(a0) | |
102 | ldt $f5, JB_F5*8(a0) | |
103 | ldt $f6, JB_F6*8(a0) | |
104 | ldt $f7, JB_F7*8(a0) | |
105 | ldt $f8, JB_F8*8(a0) | |
106 | ldt $f9, JB_F9*8(a0) | |
107 | mov t0, sp | |
108 | ret | |
109 | ||
110 | .align 4 | |
39262cc8 | 111 | $Lfail: |
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112 | cfi_restore_state |
113 | lda v0, __NR_sigaltstack | |
114 | lda a0, 0 | |
115 | lda a1, -32(sp) | |
116 | lda sp, -32(sp) | |
117 | cfi_adjust_cfa_offset(32) | |
118 | callsys | |
119 | ldq t0, 0(sp) /* ss_sp */ | |
120 | ldl t1, 8(sp) /* ss_flags */ | |
121 | ldq t2, 16(sp) /* ss_size */ | |
122 | lda sp, 32(sp) | |
123 | cfi_adjust_cfa_offset(-32) | |
124 | ||
125 | /* Without working sigaltstack we cannot perform the test. */ | |
39262cc8 | 126 | bne a3, $Lok |
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127 | |
128 | addq t0, t2, t0 /* t0 = ss_sp + ss_size */ | |
129 | subq t0, s3, t0 /* t0 = (ss_sp + ss_size) - new_sp */ | |
130 | cmpule t2, t0, t0 /* t0 = (t0 >= ss_size) */ | |
131 | and t0, t1, t0 /* t0 = (t0 >= ss_size) & (ss_flags & SS_ONSTACK) */ | |
39262cc8 | 132 | bne t0, $Lok |
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133 | |
134 | ldah a0, longjmp_msg(gp) !gprelhigh | |
135 | lda a0, longjmp_msg(a0) !gprellow | |
136 | #ifdef PIC | |
137 | jsr ra, HIDDEN_JUMPTARGET(__fortify_fail) | |
138 | #else | |
139 | bsr ra, HIDDEN_JUMPTARGET(__fortify_fail) !samegp | |
140 | #endif | |
141 | bugchk | |
142 | ||
143 | cfi_endproc | |
144 | .size ____longjmp_chk, .-____longjmp_chk |