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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Ptrace test for TAR, PPR, DSCR registers in the TM context
*
* Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
*/
#include "ptrace.h"
#include "tm.h"
#include "ptrace-tar.h"
int shm_id;
unsigned long *cptr, *pptr;
void tm_tar(void)
{
unsigned long result, texasr;
unsigned long regs[3];
int ret;
cptr = (unsigned long *)shmat(shm_id, NULL, 0);
trans:
cptr[1] = 0;
asm __volatile__(
"li 4, %[tar_1];"
"mtspr %[sprn_tar], 4;" /* TAR_1 */
"li 4, %[dscr_1];"
"mtspr %[sprn_dscr], 4;" /* DSCR_1 */
"or 31,31,31;" /* PPR_1*/
"1: ;"
"tbegin.;"
"beq 2f;"
"li 4, %[tar_2];"
"mtspr %[sprn_tar], 4;" /* TAR_2 */
"li 4, %[dscr_2];"
"mtspr %[sprn_dscr], 4;" /* DSCR_2 */
"or 1,1,1;" /* PPR_2 */
"tsuspend.;"
"li 0, 1;"
"stw 0, 0(%[cptr1]);"
"tresume.;"
"b .;"
"tend.;"
"li 0, 0;"
"ori %[res], 0, 0;"
"b 3f;"
/* Transaction abort handler */
"2: ;"
"li 0, 1;"
"ori %[res], 0, 0;"
"mfspr %[texasr], %[sprn_texasr];"
"3: ;"
: [res] "=r" (result), [texasr] "=r" (texasr)
: [sprn_dscr]"i"(SPRN_DSCR), [sprn_tar]"i"(SPRN_TAR),
[sprn_ppr]"i"(SPRN_PPR), [sprn_texasr]"i"(SPRN_TEXASR),
[tar_1]"i"(TAR_1), [dscr_1]"i"(DSCR_1), [tar_2]"i"(TAR_2),
[dscr_2]"i"(DSCR_2), [cptr1] "b" (&cptr[1])
: "memory", "r0", "r1", "r3", "r4", "r5", "r6"
);
/* TM failed, analyse */
if (result) {
if (!cptr[0])
goto trans;
regs[0] = mfspr(SPRN_TAR);
regs[1] = mfspr(SPRN_PPR);
regs[2] = mfspr(SPRN_DSCR);
shmdt(&cptr);
printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
user_read, regs[0], regs[1], regs[2]);
ret = validate_tar_registers(regs, TAR_4, PPR_4, DSCR_4);
if (ret)
exit(1);
exit(0);
}
shmdt(&cptr);
exit(1);
}
int trace_tm_tar(pid_t child)
{
unsigned long regs[3];
FAIL_IF(start_trace(child));
FAIL_IF(show_tar_registers(child, regs));
printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
ptrace_read_running, regs[0], regs[1], regs[2]);
FAIL_IF(validate_tar_registers(regs, TAR_2, PPR_2, DSCR_2));
FAIL_IF(show_tm_checkpointed_state(child, regs));
printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
ptrace_read_ckpt, regs[0], regs[1], regs[2]);
FAIL_IF(validate_tar_registers(regs, TAR_1, PPR_1, DSCR_1));
FAIL_IF(write_ckpt_tar_registers(child, TAR_4, PPR_4, DSCR_4));
printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
ptrace_write_ckpt, TAR_4, PPR_4, DSCR_4);
pptr[0] = 1;
FAIL_IF(stop_trace(child));
return TEST_PASS;
}
int ptrace_tm_tar(void)
{
pid_t pid;
int ret, status;
SKIP_IF(!have_htm());
shm_id = shmget(IPC_PRIVATE, sizeof(int) * 2, 0777|IPC_CREAT);
pid = fork();
if (pid == 0)
tm_tar();
pptr = (unsigned long *)shmat(shm_id, NULL, 0);
pptr[0] = 0;
if (pid) {
while (!pptr[1])
asm volatile("" : : : "memory");
ret = trace_tm_tar(pid);
if (ret) {
kill(pid, SIGTERM);
shmdt(&pptr);
shmctl(shm_id, IPC_RMID, NULL);
return TEST_FAIL;
}
shmdt(&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_tm_tar, "ptrace_tm_tar");
}
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