forked from OSchip/llvm-project
87 lines
2.2 KiB
C++
87 lines
2.2 KiB
C++
// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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// REQUIRES: x86_64-target-arch
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// UNSUPPORTED: tvos, watchos
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#include "test.h"
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struct ucontext {
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void *sp;
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void *fiber;
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};
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extern "C" {
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void ucontext_do_switch(void **save, void **load);
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void ucontext_trampoline();
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}
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__asm__(".global " ASM_SYMBOL(ucontext_do_switch) "\n"
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ASM_SYMBOL(ucontext_do_switch) ":\n\t"
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"pushq %rbp\n\t"
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"pushq %r15\n\t"
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"pushq %r14\n\t"
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"pushq %r13\n\t"
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"pushq %r12\n\t"
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"pushq %rbx\n\t"
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"movq %rsp, (%rdi)\n\t"
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"movq (%rsi), %rsp\n\t"
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"popq %rbx\n\t"
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"popq %r12\n\t"
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"popq %r13\n\t"
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"popq %r14\n\t"
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"popq %r15\n\t"
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"popq %rbp\n\t"
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"retq");
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__asm__(".global " ASM_SYMBOL(ucontext_trampoline) "\n"
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ASM_SYMBOL(ucontext_trampoline) ":\n\t"
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".cfi_startproc\n\t"
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".cfi_undefined rip\n\t"
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"movq %r12, %rdi\n\t"
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"jmpq *%rbx\n\t"
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".cfi_endproc");
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void ucontext_init(ucontext *context, void *stack, unsigned stack_sz,
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void (*func)(void*), void *arg) {
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void **sp = reinterpret_cast<void **>(static_cast<char *>(stack) + stack_sz);
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*(--sp) = 0;
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*(--sp) = reinterpret_cast<void *>(ucontext_trampoline);
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*(--sp) = 0; // rbp
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*(--sp) = 0; // r15
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*(--sp) = 0; // r14
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*(--sp) = 0; // r13
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*(--sp) = arg; // r12
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*(--sp) = reinterpret_cast<void *>(func); // rbx
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context->sp = sp;
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context->fiber = __tsan_create_fiber(0);
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}
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void ucontext_free(ucontext *context) {
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__tsan_destroy_fiber(context->fiber);
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}
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__attribute__((no_sanitize_thread))
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void ucontext_switch(ucontext *save, ucontext *load) {
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save->fiber = __tsan_get_current_fiber();
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__tsan_switch_to_fiber(load->fiber, 0);
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ucontext_do_switch(&save->sp, &load->sp);
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}
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char stack[64 * 1024] __attribute__((aligned(16)));
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ucontext uc, orig_uc;
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void func(void *arg) {
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__asm__ __volatile__(".cfi_undefined rip");
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ucontext_switch(&uc, &orig_uc);
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}
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int main() {
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ucontext_init(&uc, stack, sizeof(stack), func, 0);
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ucontext_switch(&orig_uc, &uc);
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ucontext_free(&uc);
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fprintf(stderr, "PASS\n");
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return 0;
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}
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// CHECK-NOT: WARNING: ThreadSanitizer:
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// CHECK: PASS
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