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68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Verify that a single TB spin-loop is properly invalidated,
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* releasing the thread from the spin-loop.
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*/
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#include <assert.h>
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#include <sys/mman.h>
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#include <pthread.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <sched.h>
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#ifdef __x86_64__
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#define READY 0x000047c6 /* movb $0,0(%rdi) */
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#define LOOP 0xfceb9090 /* 1: nop*2; jmp 1b */
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#define RETURN 0x909090c3 /* ret; nop*3 */
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#define NOP 0x90909090 /* nop*4 */
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#elif defined(__aarch64__)
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#define READY 0x3900001f /* strb wzr,[x0] */
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#define LOOP 0x14000000 /* b . */
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#define RETURN 0xd65f03c0 /* ret */
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#define NOP 0xd503201f /* nop */
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#elif defined(__riscv)
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#define READY 0x00050023 /* sb zero, (a0) */
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#define LOOP 0x0000006f /* jal zero, #0 */
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#define RETURN 0x00008067 /* jalr zero, ra, 0 */
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#define NOP 0x00000013 /* nop */
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#endif
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int main()
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{
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#ifdef READY
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int tmp;
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pthread_t thread_id;
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bool hold = true;
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uint32_t *buf;
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buf = mmap(NULL, 3 * sizeof(uint32_t),
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PROT_READ | PROT_WRITE | PROT_EXEC,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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assert(buf != MAP_FAILED);
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buf[0] = READY;
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buf[1] = LOOP;
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buf[2] = RETURN;
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alarm(2);
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tmp = pthread_create(&thread_id, NULL, (void *(*)(void *))buf, &hold);
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assert(tmp == 0);
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while (hold) {
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sched_yield();
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}
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buf[1] = NOP;
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__builtin___clear_cache(&buf[1], &buf[2]);
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tmp = pthread_join(thread_id, NULL);
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assert(tmp == 0);
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#endif
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return 0;
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}
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