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#include "sanitizer_common/sanitizer_asm.h"
.section .bss
.type __tsan_pointer_chk_guard, %object
.size __tsan_pointer_chk_guard, 8
__tsan_pointer_chk_guard:
.zero 8
.section .text
// 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.
.hidden _Z18InitializeGuardPtrv
.global _Z18InitializeGuardPtrv
.type _Z18InitializeGuardPtrv, @function
_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
.size _Z18InitializeGuardPtrv, .-_Z18InitializeGuardPtrv
.hidden __tsan_setjmp
.comm _ZN14__interception11real_setjmpE,8,8
.type setjmp, @function
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
// 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
// call tsan interceptor
bl __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
adrp x1, :got:_ZN14__interception11real_setjmpE
ldr x1, [x1, #:got_lo12:_ZN14__interception11real_setjmpE]
ldr x1, [x1]
br x1
CFI_ENDPROC
.size setjmp, .-setjmp
.comm _ZN14__interception12real__setjmpE,8,8
.globl _setjmp
.type _setjmp, @function
_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
// 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
// call tsan interceptor
bl __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
adrp x1, :got:_ZN14__interception12real__setjmpE
ldr x1, [x1, #:got_lo12:_ZN14__interception12real__setjmpE]
ldr x1, [x1]
br x1
CFI_ENDPROC
.size _setjmp, .-_setjmp
.comm _ZN14__interception14real_sigsetjmpE,8,8
.globl sigsetjmp
.type sigsetjmp, @function
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
// 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
// call tsan interceptor
bl __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
adrp x2, :got:_ZN14__interception14real_sigsetjmpE
ldr x2, [x2, #:got_lo12:_ZN14__interception14real_sigsetjmpE]
ldr x2, [x2]
br x2
CFI_ENDPROC
.size sigsetjmp, .-sigsetjmp
.comm _ZN14__interception16real___sigsetjmpE,8,8
.globl __sigsetjmp
.type __sigsetjmp, @function
__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
// 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
// call tsan interceptor
bl __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
adrp x2, :got:_ZN14__interception16real___sigsetjmpE
ldr x2, [x2, #:got_lo12:_ZN14__interception16real___sigsetjmpE]
ldr x2, [x2]
br x2
CFI_ENDPROC
.size __sigsetjmp, .-__sigsetjmp
#if defined(__linux__)
/* We do not need executable stack. */
.section .note.GNU-stack,"",@progbits
#endif
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