1 | // RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s |
2 | // REQUIRES: x86_64-target-arch |
3 | // UNSUPPORTED: tvos, watchos |
4 | #include "test.h" |
5 | |
6 | struct ucontext { |
7 | void *sp; |
8 | void *fiber; |
9 | }; |
10 | |
11 | extern "C" { |
12 | void ucontext_do_switch(void **save, void **load); |
13 | void ucontext_trampoline(); |
14 | } |
15 | |
16 | __asm__(".global " ASM_SYMBOL(ucontext_do_switch) "\n" |
17 | ASM_SYMBOL(ucontext_do_switch) ":\n\t" |
18 | "pushq %rbp\n\t" |
19 | "pushq %r15\n\t" |
20 | "pushq %r14\n\t" |
21 | "pushq %r13\n\t" |
22 | "pushq %r12\n\t" |
23 | "pushq %rbx\n\t" |
24 | "movq %rsp, (%rdi)\n\t" |
25 | "movq (%rsi), %rsp\n\t" |
26 | "popq %rbx\n\t" |
27 | "popq %r12\n\t" |
28 | "popq %r13\n\t" |
29 | "popq %r14\n\t" |
30 | "popq %r15\n\t" |
31 | "popq %rbp\n\t" |
32 | "retq" ); |
33 | |
34 | __asm__(".global " ASM_SYMBOL(ucontext_trampoline) "\n" |
35 | ASM_SYMBOL(ucontext_trampoline) ":\n\t" |
36 | ".cfi_startproc\n\t" |
37 | ".cfi_undefined rip\n\t" |
38 | "movq %r12, %rdi\n\t" |
39 | "jmpq *%rbx\n\t" |
40 | ".cfi_endproc" ); |
41 | |
42 | void ucontext_init(ucontext *context, void *stack, unsigned stack_sz, |
43 | void (*func)(void*), void *arg) { |
44 | void **sp = reinterpret_cast<void **>(static_cast<char *>(stack) + stack_sz); |
45 | *(--sp) = 0; |
46 | *(--sp) = reinterpret_cast<void *>(ucontext_trampoline); |
47 | *(--sp) = 0; // rbp |
48 | *(--sp) = 0; // r15 |
49 | *(--sp) = 0; // r14 |
50 | *(--sp) = 0; // r13 |
51 | *(--sp) = arg; // r12 |
52 | *(--sp) = reinterpret_cast<void *>(func); // rbx |
53 | context->sp = sp; |
54 | context->fiber = __tsan_create_fiber(flags: 0); |
55 | } |
56 | |
57 | void ucontext_free(ucontext *context) { |
58 | __tsan_destroy_fiber(fiber: context->fiber); |
59 | } |
60 | |
61 | __attribute__((no_sanitize_thread)) |
62 | void ucontext_switch(ucontext *save, ucontext *load) { |
63 | save->fiber = __tsan_get_current_fiber(); |
64 | __tsan_switch_to_fiber(fiber: load->fiber, flags: 0); |
65 | ucontext_do_switch(save: &save->sp, load: &load->sp); |
66 | } |
67 | |
68 | char stack[64 * 1024] __attribute__((aligned(16))); |
69 | |
70 | ucontext uc, orig_uc; |
71 | |
72 | void func(void *arg) { |
73 | __asm__ __volatile__(".cfi_undefined rip" ); |
74 | ucontext_switch(save: &uc, load: &orig_uc); |
75 | } |
76 | |
77 | int main() { |
78 | ucontext_init(context: &uc, stack, stack_sz: sizeof(stack), func, arg: 0); |
79 | ucontext_switch(save: &orig_uc, load: &uc); |
80 | ucontext_free(context: &uc); |
81 | fprintf(stderr, format: "PASS\n" ); |
82 | return 0; |
83 | } |
84 | |
85 | // CHECK-NOT: WARNING: ThreadSanitizer: |
86 | // CHECK: PASS |
87 | |