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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Ptrace test for GPR/FPR registers
*
* Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
*/
#include "ptrace.h"
#include "ptrace-gpr.h"
#include "reg.h"
#include <time.h>
/* Tracer and Tracee Shared Data */
int shm_id;
int *cptr, *pptr;
extern void gpr_child_loop(int *read_flag, int *write_flag,
unsigned long *gpr_buf, double *fpr_buf);
unsigned long child_gpr_val, parent_gpr_val;
double child_fpr_val, parent_fpr_val;
static int child(void)
{
unsigned long gpr_buf[32];
double fpr_buf[32];
int i;
cptr = (int *)shmat(shm_id, NULL, 0);
memset(gpr_buf, 0, sizeof(gpr_buf));
memset(fpr_buf, 0, sizeof(fpr_buf));
for (i = 0; i < 32; i++) {
gpr_buf[i] = child_gpr_val;
fpr_buf[i] = child_fpr_val;
}
gpr_child_loop(&cptr[0], &cptr[1], gpr_buf, fpr_buf);
shmdt((void *)cptr);
FAIL_IF(validate_gpr(gpr_buf, parent_gpr_val));
FAIL_IF(validate_fpr_double(fpr_buf, parent_fpr_val));
return 0;
}
int trace_gpr(pid_t child)
{
unsigned long gpr[18];
__u64 tmp, fpr[32];
FAIL_IF(start_trace(child));
FAIL_IF(show_gpr(child, gpr));
FAIL_IF(validate_gpr(gpr, child_gpr_val));
FAIL_IF(show_fpr(child, fpr));
memcpy(&tmp, &child_fpr_val, sizeof(tmp));
FAIL_IF(validate_fpr(fpr, tmp));
FAIL_IF(write_gpr(child, parent_gpr_val));
memcpy(&tmp, &parent_fpr_val, sizeof(tmp));
FAIL_IF(write_fpr(child, tmp));
FAIL_IF(stop_trace(child));
return TEST_PASS;
}
#ifndef __LONG_WIDTH__
#define __LONG_WIDTH__ (sizeof(long) * 8)
#endif
static uint64_t rand_reg(void)
{
uint64_t result;
long r;
r = random();
// Small values are typical
result = r & 0xffff;
if (r & 0x10000)
return result;
// Pointers tend to have high bits set
result |= random() << (__LONG_WIDTH__ - 31);
if (r & 0x100000)
return result;
// And sometimes we want a full 64-bit value
result ^= random() << 16;
return result;
}
int ptrace_gpr(void)
{
unsigned long seed;
int ret, status;
pid_t pid;
seed = getpid() ^ time(NULL);
printf("srand(%lu)\n", seed);
srand(seed);
child_gpr_val = rand_reg();
child_fpr_val = rand_reg();
parent_gpr_val = rand_reg();
parent_fpr_val = rand_reg();
shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
pid = fork();
if (pid < 0) {
perror("fork() failed");
return TEST_FAIL;
}
if (pid == 0)
exit(child());
if (pid) {
pptr = (int *)shmat(shm_id, NULL, 0);
while (!pptr[1])
asm volatile("" : : : "memory");
ret = trace_gpr(pid);
if (ret) {
kill(pid, SIGTERM);
shmdt((void *)pptr);
shmctl(shm_id, IPC_RMID, NULL);
return TEST_FAIL;
}
pptr[0] = 1;
shmdt((void *)pptr);
ret = wait(&status);
shmctl(shm_id, IPC_RMID, NULL);
if (ret != pid) {
printf("Child's exit status not captured\n");
return TEST_FAIL;
}
return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
TEST_PASS;
}
return TEST_PASS;
}
int main(int argc, char *argv[])
{
return test_harness(ptrace_gpr, "ptrace_gpr");
}
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