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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Ptrace test for TAR, PPR, DSCR registers
*
* Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
*/
#include "ptrace.h"
#include "ptrace-tar.h"
/* Tracer and Tracee Shared Data */
int shm_id;
int *cptr;
int *pptr;
void tar(void)
{
unsigned long reg[3];
int ret;
cptr = (int *)shmat(shm_id, NULL, 0);
printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
user_write, TAR_1, PPR_1, DSCR_1);
mtspr(SPRN_TAR, TAR_1);
mtspr(SPRN_PPR, PPR_1);
mtspr(SPRN_DSCR, DSCR_1);
cptr[2] = 1;
/* Wait on parent */
while (!cptr[0])
asm volatile("" : : : "memory");
reg[0] = mfspr(SPRN_TAR);
reg[1] = mfspr(SPRN_PPR);
reg[2] = mfspr(SPRN_DSCR);
printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
user_read, reg[0], reg[1], reg[2]);
/* Unblock the parent now */
cptr[1] = 1;
shmdt((int *)cptr);
ret = validate_tar_registers(reg, TAR_2, PPR_2, DSCR_2);
if (ret)
exit(1);
exit(0);
}
int trace_tar(pid_t child)
{
unsigned long reg[3];
FAIL_IF(start_trace(child));
FAIL_IF(show_tar_registers(child, reg));
printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
ptrace_read_running, reg[0], reg[1], reg[2]);
FAIL_IF(validate_tar_registers(reg, TAR_1, PPR_1, DSCR_1));
FAIL_IF(stop_trace(child));
return TEST_PASS;
}
int trace_tar_write(pid_t child)
{
FAIL_IF(start_trace(child));
FAIL_IF(write_tar_registers(child, TAR_2, PPR_2, DSCR_2));
printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
ptrace_write_running, TAR_2, PPR_2, DSCR_2);
FAIL_IF(stop_trace(child));
return TEST_PASS;
}
int ptrace_tar(void)
{
pid_t pid;
int ret, status;
// TAR was added in v2.07
SKIP_IF_MSG(!have_hwcap2(PPC_FEATURE2_ARCH_2_07), "TAR requires ISA 2.07 compatible hardware");
shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
pid = fork();
if (pid < 0) {
perror("fork() failed");
return TEST_FAIL;
}
if (pid == 0)
tar();
if (pid) {
pptr = (int *)shmat(shm_id, NULL, 0);
pptr[0] = 0;
pptr[1] = 0;
while (!pptr[2])
asm volatile("" : : : "memory");
ret = trace_tar(pid);
if (ret)
return ret;
ret = trace_tar_write(pid);
if (ret)
return ret;
/* Unblock the child now */
pptr[0] = 1;
/* Wait on child */
while (!pptr[1])
asm volatile("" : : : "memory");
shmdt((int *)pptr);
ret = wait(&status);
shmctl(shm_id, IPC_RMID, NULL);
if (ret != pid) {
printf("Child's exit status not captured\n");
return TEST_PASS;
}
return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
TEST_PASS;
}
return TEST_PASS;
}
int main(int argc, char *argv[])
{
return test_harness(ptrace_tar, "ptrace_tar");
}
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