135 lines
2.5 KiB
C
135 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Ptrace test for TAR, PPR, DSCR registers
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*
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* Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
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*/
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#include "ptrace.h"
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#include "ptrace-tar.h"
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/* Tracer and Tracee Shared Data */
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int shm_id;
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int *cptr;
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int *pptr;
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void tar(void)
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{
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unsigned long reg[3];
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int ret;
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cptr = (int *)shmat(shm_id, NULL, 0);
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printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
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user_write, TAR_1, PPR_1, DSCR_1);
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mtspr(SPRN_TAR, TAR_1);
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mtspr(SPRN_PPR, PPR_1);
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mtspr(SPRN_DSCR, DSCR_1);
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cptr[2] = 1;
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/* Wait on parent */
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while (!cptr[0])
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asm volatile("" : : : "memory");
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reg[0] = mfspr(SPRN_TAR);
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reg[1] = mfspr(SPRN_PPR);
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reg[2] = mfspr(SPRN_DSCR);
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printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
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user_read, reg[0], reg[1], reg[2]);
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/* Unblock the parent now */
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cptr[1] = 1;
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shmdt((int *)cptr);
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ret = validate_tar_registers(reg, TAR_2, PPR_2, DSCR_2);
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if (ret)
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exit(1);
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exit(0);
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}
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int trace_tar(pid_t child)
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{
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unsigned long reg[3];
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FAIL_IF(start_trace(child));
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FAIL_IF(show_tar_registers(child, reg));
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printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
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ptrace_read_running, reg[0], reg[1], reg[2]);
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FAIL_IF(validate_tar_registers(reg, TAR_1, PPR_1, DSCR_1));
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FAIL_IF(stop_trace(child));
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return TEST_PASS;
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}
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int trace_tar_write(pid_t child)
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{
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FAIL_IF(start_trace(child));
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FAIL_IF(write_tar_registers(child, TAR_2, PPR_2, DSCR_2));
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printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
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ptrace_write_running, TAR_2, PPR_2, DSCR_2);
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FAIL_IF(stop_trace(child));
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return TEST_PASS;
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}
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int ptrace_tar(void)
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{
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pid_t pid;
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int ret, status;
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// TAR was added in v2.07
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SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));
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shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
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pid = fork();
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if (pid < 0) {
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perror("fork() failed");
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return TEST_FAIL;
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}
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if (pid == 0)
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tar();
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if (pid) {
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pptr = (int *)shmat(shm_id, NULL, 0);
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pptr[0] = 0;
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pptr[1] = 0;
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while (!pptr[2])
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asm volatile("" : : : "memory");
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ret = trace_tar(pid);
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if (ret)
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return ret;
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ret = trace_tar_write(pid);
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if (ret)
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return ret;
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/* Unblock the child now */
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pptr[0] = 1;
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/* Wait on child */
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while (!pptr[1])
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asm volatile("" : : : "memory");
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shmdt((int *)pptr);
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ret = wait(&status);
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shmctl(shm_id, IPC_RMID, NULL);
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if (ret != pid) {
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printf("Child's exit status not captured\n");
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return TEST_PASS;
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}
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return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
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TEST_PASS;
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}
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return TEST_PASS;
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}
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int main(int argc, char *argv[])
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{
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return test_harness(ptrace_tar, "ptrace_tar");
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}
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