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selftests/powerpc: Add ptrace tests for TAR, PPR, DSCR registers
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This patch adds ptrace interface test for TAR, PPR, DSCR
registers. This also adds ptrace interface based helper
functions related to TAR, PPR, DSCR register access.

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Simon Guo <wei.guo.simon@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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Anshuman Khandual authored and Michael Ellerman committed Nov 17, 2016
1 parent c7096dc commit 254dae5
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Showing 5 changed files with 370 additions and 2 deletions.
3 changes: 2 additions & 1 deletion tools/testing/selftests/powerpc/ptrace/.gitignore
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@@ -1,3 +1,4 @@
ptrace-gpr
ptrace-tm-gpr
ptrace-tm-spd-gpr
ptrace-tm-spd-gpr
ptrace-tar
3 changes: 2 additions & 1 deletion tools/testing/selftests/powerpc/ptrace/Makefile
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@@ -1,4 +1,5 @@
TEST_PROGS := ptrace-gpr ptrace-tm-gpr ptrace-tm-spd-gpr
TEST_PROGS := ptrace-gpr ptrace-tm-gpr ptrace-tm-spd-gpr \
ptrace-tar

include ../../lib.mk

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135 changes: 135 additions & 0 deletions tools/testing/selftests/powerpc/ptrace/ptrace-tar.c
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/*
* Ptrace test for TAR, PPR, DSCR registers
*
* Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#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;

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");
}
50 changes: 50 additions & 0 deletions tools/testing/selftests/powerpc/ptrace/ptrace-tar.h
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/*
* Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#define TAR_1 10
#define TAR_2 20
#define TAR_3 30
#define TAR_4 40
#define TAR_5 50

#define DSCR_1 100
#define DSCR_2 200
#define DSCR_3 300
#define DSCR_4 400
#define DSCR_5 500

#define PPR_1 0x4000000000000 /* or 31,31,31*/
#define PPR_2 0x8000000000000 /* or 1,1,1 */
#define PPR_3 0xc000000000000 /* or 6,6,6 */
#define PPR_4 0x10000000000000 /* or 2,2,2 */

char *user_read = "[User Read (Running)]";
char *user_write = "[User Write (Running)]";
char *ptrace_read_running = "[Ptrace Read (Running)]";
char *ptrace_write_running = "[Ptrace Write (Running)]";
char *ptrace_read_ckpt = "[Ptrace Read (Checkpointed)]";
char *ptrace_write_ckpt = "[Ptrace Write (Checkpointed)]";

int validate_tar_registers(unsigned long *reg, unsigned long tar,
unsigned long ppr, unsigned long dscr)
{
int match = 1;

if (reg[0] != tar)
match = 0;

if (reg[1] != ppr)
match = 0;

if (reg[2] != dscr)
match = 0;

if (!match)
return TEST_FAIL;
return TEST_PASS;
}
181 changes: 181 additions & 0 deletions tools/testing/selftests/powerpc/ptrace/ptrace.h
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Expand Up @@ -97,6 +97,187 @@ int cont_trace(pid_t child)
return TEST_PASS;
}

/* TAR, PPR, DSCR */
int show_tar_registers(pid_t child, unsigned long *out)
{
struct iovec iov;
unsigned long *reg;
int ret;

reg = malloc(sizeof(unsigned long));
if (!reg) {
perror("malloc() failed");
return TEST_FAIL;
}
iov.iov_base = (u64 *) reg;
iov.iov_len = sizeof(unsigned long);

ret = ptrace(PTRACE_GETREGSET, child, NT_PPC_TAR, &iov);
if (ret) {
perror("ptrace(PTRACE_GETREGSET) failed");
goto fail;
}
if (out)
out[0] = *reg;

ret = ptrace(PTRACE_GETREGSET, child, NT_PPC_PPR, &iov);
if (ret) {
perror("ptrace(PTRACE_GETREGSET) failed");
goto fail;
}
if (out)
out[1] = *reg;

ret = ptrace(PTRACE_GETREGSET, child, NT_PPC_DSCR, &iov);
if (ret) {
perror("ptrace(PTRACE_GETREGSET) failed");
goto fail;
}
if (out)
out[2] = *reg;

free(reg);
return TEST_PASS;
fail:
free(reg);
return TEST_FAIL;
}

int write_tar_registers(pid_t child, unsigned long tar,
unsigned long ppr, unsigned long dscr)
{
struct iovec iov;
unsigned long *reg;
int ret;

reg = malloc(sizeof(unsigned long));
if (!reg) {
perror("malloc() failed");
return TEST_FAIL;
}

iov.iov_base = (u64 *) reg;
iov.iov_len = sizeof(unsigned long);

*reg = tar;
ret = ptrace(PTRACE_SETREGSET, child, NT_PPC_TAR, &iov);
if (ret) {
perror("ptrace(PTRACE_SETREGSET) failed");
goto fail;
}

*reg = ppr;
ret = ptrace(PTRACE_SETREGSET, child, NT_PPC_PPR, &iov);
if (ret) {
perror("ptrace(PTRACE_SETREGSET) failed");
goto fail;
}

*reg = dscr;
ret = ptrace(PTRACE_SETREGSET, child, NT_PPC_DSCR, &iov);
if (ret) {
perror("ptrace(PTRACE_SETREGSET) failed");
goto fail;
}

free(reg);
return TEST_PASS;
fail:
free(reg);
return TEST_FAIL;
}

int show_tm_checkpointed_state(pid_t child, unsigned long *out)
{
struct iovec iov;
unsigned long *reg;
int ret;

reg = malloc(sizeof(unsigned long));
if (!reg) {
perror("malloc() failed");
return TEST_FAIL;
}

iov.iov_base = (u64 *) reg;
iov.iov_len = sizeof(unsigned long);

ret = ptrace(PTRACE_GETREGSET, child, NT_PPC_TM_CTAR, &iov);
if (ret) {
perror("ptrace(PTRACE_GETREGSET) failed");
goto fail;
}
if (out)
out[0] = *reg;

ret = ptrace(PTRACE_GETREGSET, child, NT_PPC_TM_CPPR, &iov);
if (ret) {
perror("ptrace(PTRACE_GETREGSET) failed");
goto fail;
}
if (out)
out[1] = *reg;

ret = ptrace(PTRACE_GETREGSET, child, NT_PPC_TM_CDSCR, &iov);
if (ret) {
perror("ptrace(PTRACE_GETREGSET) failed");
goto fail;
}
if (out)
out[2] = *reg;

free(reg);
return TEST_PASS;

fail:
free(reg);
return TEST_FAIL;
}

int write_ckpt_tar_registers(pid_t child, unsigned long tar,
unsigned long ppr, unsigned long dscr)
{
struct iovec iov;
unsigned long *reg;
int ret;

reg = malloc(sizeof(unsigned long));
if (!reg) {
perror("malloc() failed");
return TEST_FAIL;
}

iov.iov_base = (u64 *) reg;
iov.iov_len = sizeof(unsigned long);

*reg = tar;
ret = ptrace(PTRACE_SETREGSET, child, NT_PPC_TM_CTAR, &iov);
if (ret) {
perror("ptrace(PTRACE_GETREGSET) failed");
goto fail;
}

*reg = ppr;
ret = ptrace(PTRACE_SETREGSET, child, NT_PPC_TM_CPPR, &iov);
if (ret) {
perror("ptrace(PTRACE_GETREGSET) failed");
goto fail;
}

*reg = dscr;
ret = ptrace(PTRACE_SETREGSET, child, NT_PPC_TM_CDSCR, &iov);
if (ret) {
perror("ptrace(PTRACE_GETREGSET) failed");
goto fail;
}

free(reg);
return TEST_PASS;
fail:
free(reg);
return TEST_FAIL;
}

/* FPR */
int show_fpr(pid_t child, unsigned long *fpr)
{
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