1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Ptrace test for TAR, PPR, DSCR registers
  4 *
  5 * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
  6 */
  7#include "ptrace.h"
  8#include "ptrace-tar.h"
  9
 10/* Tracer and Tracee Shared Data */
 11int shm_id;
 12int *cptr;
 13int *pptr;
 14
 15void tar(void)
 16{
 17	unsigned long reg[3];
 18	int ret;
 19
 20	cptr = (int *)shmat(shm_id, NULL, 0);
 21	printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
 22			user_write, TAR_1, PPR_1, DSCR_1);
 23
 24	mtspr(SPRN_TAR, TAR_1);
 25	mtspr(SPRN_PPR, PPR_1);
 26	mtspr(SPRN_DSCR, DSCR_1);
 27
 28	cptr[2] = 1;
 29
 30	/* Wait on parent */
 31	while (!cptr[0])
 32		asm volatile("" : : : "memory");
 33
 34	reg[0] = mfspr(SPRN_TAR);
 35	reg[1] = mfspr(SPRN_PPR);
 36	reg[2] = mfspr(SPRN_DSCR);
 37
 38	printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
 39			user_read, reg[0], reg[1], reg[2]);
 40
 41	/* Unblock the parent now */
 42	cptr[1] = 1;
 43	shmdt((int *)cptr);
 44
 45	ret = validate_tar_registers(reg, TAR_2, PPR_2, DSCR_2);
 46	if (ret)
 47		exit(1);
 48	exit(0);
 49}
 50
 51int trace_tar(pid_t child)
 52{
 53	unsigned long reg[3];
 54
 55	FAIL_IF(start_trace(child));
 56	FAIL_IF(show_tar_registers(child, reg));
 57	printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
 58			ptrace_read_running, reg[0], reg[1], reg[2]);
 59
 60	FAIL_IF(validate_tar_registers(reg, TAR_1, PPR_1, DSCR_1));
 61	FAIL_IF(stop_trace(child));
 62	return TEST_PASS;
 63}
 64
 65int trace_tar_write(pid_t child)
 66{
 67	FAIL_IF(start_trace(child));
 68	FAIL_IF(write_tar_registers(child, TAR_2, PPR_2, DSCR_2));
 69	printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
 70			ptrace_write_running, TAR_2, PPR_2, DSCR_2);
 71
 72	FAIL_IF(stop_trace(child));
 73	return TEST_PASS;
 74}
 75
 76int ptrace_tar(void)
 77{
 78	pid_t pid;
 79	int ret, status;
 80
 81	// TAR was added in v2.07
 82	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));
 83
 84	shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
 85	pid = fork();
 86	if (pid < 0) {
 87		perror("fork() failed");
 88		return TEST_FAIL;
 89	}
 90
 91	if (pid == 0)
 92		tar();
 93
 94	if (pid) {
 95		pptr = (int *)shmat(shm_id, NULL, 0);
 96		pptr[0] = 0;
 97		pptr[1] = 0;
 98
 99		while (!pptr[2])
100			asm volatile("" : : : "memory");
101		ret = trace_tar(pid);
102		if (ret)
103			return ret;
104
105		ret = trace_tar_write(pid);
106		if (ret)
107			return ret;
108
109		/* Unblock the child now */
110		pptr[0] = 1;
111
112		/* Wait on child */
113		while (!pptr[1])
114			asm volatile("" : : : "memory");
115
116		shmdt((int *)pptr);
117
118		ret = wait(&status);
119		shmctl(shm_id, IPC_RMID, NULL);
120		if (ret != pid) {
121			printf("Child's exit status not captured\n");
122			return TEST_PASS;
123		}
124
125		return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
126			TEST_PASS;
127	}
128	return TEST_PASS;
129}
130
131int main(int argc, char *argv[])
132{
133	return test_harness(ptrace_tar, "ptrace_tar");
134}

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Ptrace test for TAR, PPR, DSCR registers
  4 *
  5 * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
  6 */
  7#include "ptrace.h"
  8#include "ptrace-tar.h"
  9
 10/* Tracer and Tracee Shared Data */
 11int shm_id;
 12int *cptr;
 13int *pptr;
 14
 15void tar(void)
 16{
 17	unsigned long reg[3];
 18	int ret;
 19
 20	cptr = (int *)shmat(shm_id, NULL, 0);
 21	printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
 22			user_write, TAR_1, PPR_1, DSCR_1);
 23
 24	mtspr(SPRN_TAR, TAR_1);
 25	mtspr(SPRN_PPR, PPR_1);
 26	mtspr(SPRN_DSCR, DSCR_1);
 27
 28	cptr[2] = 1;
 29
 30	/* Wait on parent */
 31	while (!cptr[0])
 32		asm volatile("" : : : "memory");
 33
 34	reg[0] = mfspr(SPRN_TAR);
 35	reg[1] = mfspr(SPRN_PPR);
 36	reg[2] = mfspr(SPRN_DSCR);
 37
 38	printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
 39			user_read, reg[0], reg[1], reg[2]);
 40
 41	/* Unblock the parent now */
 42	cptr[1] = 1;
 43	shmdt((int *)cptr);
 44
 45	ret = validate_tar_registers(reg, TAR_2, PPR_2, DSCR_2);
 46	if (ret)
 47		exit(1);
 48	exit(0);
 49}
 50
 51int trace_tar(pid_t child)
 52{
 53	unsigned long reg[3];
 54
 55	FAIL_IF(start_trace(child));
 56	FAIL_IF(show_tar_registers(child, reg));
 57	printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
 58			ptrace_read_running, reg[0], reg[1], reg[2]);
 59
 60	FAIL_IF(validate_tar_registers(reg, TAR_1, PPR_1, DSCR_1));
 61	FAIL_IF(stop_trace(child));
 62	return TEST_PASS;
 63}
 64
 65int trace_tar_write(pid_t child)
 66{
 67	FAIL_IF(start_trace(child));
 68	FAIL_IF(write_tar_registers(child, TAR_2, PPR_2, DSCR_2));
 69	printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
 70			ptrace_write_running, TAR_2, PPR_2, DSCR_2);
 71
 72	FAIL_IF(stop_trace(child));
 73	return TEST_PASS;
 74}
 75
 76int ptrace_tar(void)
 77{
 78	pid_t pid;
 79	int ret, status;
 80
 
 
 
 81	shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
 82	pid = fork();
 83	if (pid < 0) {
 84		perror("fork() failed");
 85		return TEST_FAIL;
 86	}
 87
 88	if (pid == 0)
 89		tar();
 90
 91	if (pid) {
 92		pptr = (int *)shmat(shm_id, NULL, 0);
 93		pptr[0] = 0;
 94		pptr[1] = 0;
 95
 96		while (!pptr[2])
 97			asm volatile("" : : : "memory");
 98		ret = trace_tar(pid);
 99		if (ret)
100			return ret;
101
102		ret = trace_tar_write(pid);
103		if (ret)
104			return ret;
105
106		/* Unblock the child now */
107		pptr[0] = 1;
108
109		/* Wait on child */
110		while (!pptr[1])
111			asm volatile("" : : : "memory");
112
113		shmdt((int *)pptr);
114
115		ret = wait(&status);
116		shmctl(shm_id, IPC_RMID, NULL);
117		if (ret != pid) {
118			printf("Child's exit status not captured\n");
119			return TEST_PASS;
120		}
121
122		return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
123			TEST_PASS;
124	}
125	return TEST_PASS;
126}
127
128int main(int argc, char *argv[])
129{
130	return test_harness(ptrace_tar, "ptrace_tar");
131}