1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
|
// The content of this file is AArch64-only:
#if defined(__aarch64__)
#include "sanitizer_common/sanitizer_asm.h"
#if !defined(__APPLE__)
.section .bss
.type __tsan_pointer_chk_guard, %object
ASM_SIZE(ASM_SYMBOL_INTERCEPTOR(__tsan_pointer_chk_guard))
__tsan_pointer_chk_guard:
.zero 8
#endif
#if defined(__APPLE__)
.align 2
.section __DATA,__nl_symbol_ptr,non_lazy_symbol_pointers
.long _setjmp$non_lazy_ptr
_setjmp$non_lazy_ptr:
.indirect_symbol _setjmp
.long 0
.section __DATA,__nl_symbol_ptr,non_lazy_symbol_pointers
.long __setjmp$non_lazy_ptr
__setjmp$non_lazy_ptr:
.indirect_symbol __setjmp
.long 0
.section __DATA,__nl_symbol_ptr,non_lazy_symbol_pointers
.long _sigsetjmp$non_lazy_ptr
_sigsetjmp$non_lazy_ptr:
.indirect_symbol _sigsetjmp
.long 0
#endif
#if !defined(__APPLE__)
.section .text
#else
.section __TEXT,__text
.align 3
#endif
#if !defined(__APPLE__)
// GLIBC mangles the function pointers in jmp_buf (used in {set,long}*jmp
// functions) by XORing them with a random guard pointer. For AArch64 it is a
// global variable rather than a TCB one (as for x86_64/powerpc) and althought
// its value is exported by the loader, it lies within a private GLIBC
// namespace (meaning it should be only used by GLIBC itself and the ABI is
// not stable). So InitializeGuardPtr obtains the pointer guard value by
// issuing a setjmp and checking the resulting pointers values against the
// original ones.
ASM_HIDDEN(_Z18InitializeGuardPtrv)
.global _Z18InitializeGuardPtrv
ASM_TYPE_FUNCTION(ASM_SYMBOL_INTERCEPTOR(_Z18InitializeGuardPtrv))
_Z18InitializeGuardPtrv:
CFI_STARTPROC
// Allocates a jmp_buf for the setjmp call.
stp x29, x30, [sp, -336]!
CFI_DEF_CFA_OFFSET (336)
CFI_OFFSET (29, -336)
CFI_OFFSET (30, -328)
add x29, sp, 0
CFI_DEF_CFA_REGISTER (29)
add x0, x29, 24
// Call libc setjmp that mangle the stack pointer value
adrp x1, :got:_ZN14__interception12real__setjmpE
ldr x1, [x1, #:got_lo12:_ZN14__interception12real__setjmpE]
ldr x1, [x1]
blr x1
// glibc setjmp mangles both the frame pointer (FP, pc+4 on blr) and the
// stack pointer (SP). FP will be placed on ((uintptr*)jmp_buf)[11] and
// SP at ((uintptr*)jmp_buf)[13].
// The mangle operation is just 'value' xor 'pointer guard value' and
// if we know the original value (SP) and the expected one, we can derive
// the guard pointer value.
mov x0, sp
// Loads the mangled SP pointer.
ldr x1, [x29, 128]
eor x0, x0, x1
adrp x2, __tsan_pointer_chk_guard
str x0, [x2, #:lo12:__tsan_pointer_chk_guard]
ldp x29, x30, [sp], 336
CFI_RESTORE (30)
CFI_RESTORE (19)
CFI_DEF_CFA (31, 0)
ret
CFI_ENDPROC
ASM_SIZE(ASM_SYMBOL_INTERCEPTOR(_Z18InitializeGuardPtrv))
#endif
ASM_HIDDEN(__tsan_setjmp)
.comm _ZN14__interception11real_setjmpE,8,8
.globl ASM_SYMBOL_INTERCEPTOR(setjmp)
ASM_TYPE_FUNCTION(ASM_SYMBOL_INTERCEPTOR(setjmp))
ASM_SYMBOL_INTERCEPTOR(setjmp):
CFI_STARTPROC
// save env parameters for function call
stp x29, x30, [sp, -32]!
CFI_DEF_CFA_OFFSET (32)
CFI_OFFSET (29, -32)
CFI_OFFSET (30, -24)
// Adjust the SP for previous frame
add x29, sp, 0
CFI_DEF_CFA_REGISTER (29)
// Save jmp_buf
str x19, [sp, 16]
CFI_OFFSET (19, -16)
mov x19, x0
#if !defined(__APPLE__)
// SP pointer mangling (see glibc setjmp)
adrp x2, __tsan_pointer_chk_guard
ldr x2, [x2, #:lo12:__tsan_pointer_chk_guard]
add x0, x29, 32
eor x1, x2, x0
#else
adrp x2, ___tsan_darwin_setjmp_xor_key@page
ldr x2, [x2, ___tsan_darwin_setjmp_xor_key@pageoff]
add x0, x29, 32
eor x1, x2, x0
#endif
// call tsan interceptor
bl ASM_SYMBOL(__tsan_setjmp)
// restore env parameter
mov x0, x19
ldr x19, [sp, 16]
ldp x29, x30, [sp], 32
CFI_RESTORE (30)
CFI_RESTORE (19)
CFI_DEF_CFA (31, 0)
// tail jump to libc setjmp
#if !defined(__APPLE__)
adrp x1, :got:_ZN14__interception11real_setjmpE
ldr x1, [x1, #:got_lo12:_ZN14__interception11real_setjmpE]
ldr x1, [x1]
#else
adrp x1, _setjmp$non_lazy_ptr@page
add x1, x1, _setjmp$non_lazy_ptr@pageoff
ldr x1, [x1]
#endif
br x1
CFI_ENDPROC
ASM_SIZE(ASM_SYMBOL_INTERCEPTOR(setjmp))
.comm _ZN14__interception12real__setjmpE,8,8
.globl ASM_SYMBOL_INTERCEPTOR(_setjmp)
ASM_TYPE_FUNCTION(ASM_SYMBOL_INTERCEPTOR(_setjmp))
ASM_SYMBOL_INTERCEPTOR(_setjmp):
CFI_STARTPROC
// save env parameters for function call
stp x29, x30, [sp, -32]!
CFI_DEF_CFA_OFFSET (32)
CFI_OFFSET (29, -32)
CFI_OFFSET (30, -24)
// Adjust the SP for previous frame
add x29, sp, 0
CFI_DEF_CFA_REGISTER (29)
// Save jmp_buf
str x19, [sp, 16]
CFI_OFFSET (19, -16)
mov x19, x0
#if !defined(__APPLE__)
// SP pointer mangling (see glibc setjmp)
adrp x2, __tsan_pointer_chk_guard
ldr x2, [x2, #:lo12:__tsan_pointer_chk_guard]
add x0, x29, 32
eor x1, x2, x0
#else
adrp x2, ___tsan_darwin_setjmp_xor_key@page
ldr x2, [x2, ___tsan_darwin_setjmp_xor_key@pageoff]
add x0, x29, 32
eor x1, x2, x0
#endif
// call tsan interceptor
bl ASM_SYMBOL(__tsan_setjmp)
// Restore jmp_buf parameter
mov x0, x19
ldr x19, [sp, 16]
ldp x29, x30, [sp], 32
CFI_RESTORE (30)
CFI_RESTORE (19)
CFI_DEF_CFA (31, 0)
// tail jump to libc setjmp
#if !defined(__APPLE__)
adrp x1, :got:_ZN14__interception12real__setjmpE
ldr x1, [x1, #:got_lo12:_ZN14__interception12real__setjmpE]
ldr x1, [x1]
#else
adrp x1, __setjmp$non_lazy_ptr@page
add x1, x1, __setjmp$non_lazy_ptr@pageoff
ldr x1, [x1]
#endif
br x1
CFI_ENDPROC
ASM_SIZE(ASM_SYMBOL_INTERCEPTOR(_setjmp))
.comm _ZN14__interception14real_sigsetjmpE,8,8
.globl ASM_SYMBOL_INTERCEPTOR(sigsetjmp)
ASM_TYPE_FUNCTION(ASM_SYMBOL_INTERCEPTOR(sigsetjmp))
ASM_SYMBOL_INTERCEPTOR(sigsetjmp):
CFI_STARTPROC
// save env parameters for function call
stp x29, x30, [sp, -32]!
CFI_DEF_CFA_OFFSET (32)
CFI_OFFSET (29, -32)
CFI_OFFSET (30, -24)
// Adjust the SP for previous frame
add x29, sp, 0
CFI_DEF_CFA_REGISTER (29)
// Save jmp_buf and savesigs
stp x19, x20, [sp, 16]
CFI_OFFSET (19, -16)
CFI_OFFSET (20, -8)
mov w20, w1
mov x19, x0
#if !defined(__APPLE__)
// SP pointer mangling (see glibc setjmp)
adrp x2, __tsan_pointer_chk_guard
ldr x2, [x2, #:lo12:__tsan_pointer_chk_guard]
add x0, x29, 32
eor x1, x2, x0
#else
adrp x2, ___tsan_darwin_setjmp_xor_key@page
ldr x2, [x2, ___tsan_darwin_setjmp_xor_key@pageoff]
add x0, x29, 32
eor x1, x2, x0
#endif
// call tsan interceptor
bl ASM_SYMBOL(__tsan_setjmp)
// restore env parameter
mov w1, w20
mov x0, x19
ldp x19, x20, [sp, 16]
ldp x29, x30, [sp], 32
CFI_RESTORE (30)
CFI_RESTORE (29)
CFI_RESTORE (19)
CFI_RESTORE (20)
CFI_DEF_CFA (31, 0)
// tail jump to libc sigsetjmp
#if !defined(__APPLE__)
adrp x2, :got:_ZN14__interception14real_sigsetjmpE
ldr x2, [x2, #:got_lo12:_ZN14__interception14real_sigsetjmpE]
ldr x2, [x2]
#else
adrp x2, _sigsetjmp$non_lazy_ptr@page
add x2, x2, _sigsetjmp$non_lazy_ptr@pageoff
ldr x2, [x2]
#endif
br x2
CFI_ENDPROC
ASM_SIZE(ASM_SYMBOL_INTERCEPTOR(sigsetjmp))
#if !defined(__APPLE__)
.comm _ZN14__interception16real___sigsetjmpE,8,8
.globl ASM_SYMBOL_INTERCEPTOR(__sigsetjmp)
ASM_TYPE_FUNCTION(ASM_SYMBOL_INTERCEPTOR(__sigsetjmp))
ASM_SYMBOL_INTERCEPTOR(__sigsetjmp):
CFI_STARTPROC
// save env parameters for function call
stp x29, x30, [sp, -32]!
CFI_DEF_CFA_OFFSET (32)
CFI_OFFSET (29, -32)
CFI_OFFSET (30, -24)
// Adjust the SP for previous frame
add x29, sp, 0
CFI_DEF_CFA_REGISTER (29)
// Save jmp_buf and savesigs
stp x19, x20, [sp, 16]
CFI_OFFSET (19, -16)
CFI_OFFSET (20, -8)
mov w20, w1
mov x19, x0
#if !defined(__APPLE__)
// SP pointer mangling (see glibc setjmp)
adrp x2, __tsan_pointer_chk_guard
ldr x2, [x2, #:lo12:__tsan_pointer_chk_guard]
add x0, x29, 32
eor x1, x2, x0
#endif
// call tsan interceptor
bl ASM_SYMBOL(__tsan_setjmp)
mov w1, w20
mov x0, x19
ldp x19, x20, [sp, 16]
ldp x29, x30, [sp], 32
CFI_RESTORE (30)
CFI_RESTORE (29)
CFI_RESTORE (19)
CFI_RESTORE (20)
CFI_DEF_CFA (31, 0)
// tail jump to libc __sigsetjmp
#if !defined(__APPLE__)
adrp x2, :got:_ZN14__interception16real___sigsetjmpE
ldr x2, [x2, #:got_lo12:_ZN14__interception16real___sigsetjmpE]
ldr x2, [x2]
#else
adrp x2, ASM_SYMBOL(__sigsetjmp)@page
add x2, x2, ASM_SYMBOL(__sigsetjmp)@pageoff
#endif
br x2
CFI_ENDPROC
ASM_SIZE(ASM_SYMBOL_INTERCEPTOR(__sigsetjmp))
#endif
#if defined(__linux__)
/* We do not need executable stack. */
.section .note.GNU-stack,"",@progbits
#endif
#endif
|
