[PATCH v11 19/27] selftests/powerpc: Add ptrace tests for TAR, PPR, DSCR registers

wei.guo.simon
2016-07-17T02:03:18Z

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.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: Cyril Bur <cyrilbur@gmail.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Simon Guo <wei.guo.simon@gmail.com>
Cc: Ulrich Weigand <ulrich.weigand@de.ibm.com>
Cc: Michael Neuling <mikey@neuling.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Rashmica Gupta <rashmicy@gmail.com>
Cc: Khem Raj <raj.khem@gmail.com>
Cc: Jessica Yu <jeyu@redhat.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Miroslav Benes <mbenes@suse.cz>
Cc: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Cc: Chris Smart <chris@distroguy.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org
Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Simon Guo <wei.guo.simon@gmail.com>
---
tools/testing/selftests/powerpc/ptrace/Makefile | 3 +-
.../testing/selftests/powerpc/ptrace/ptrace-tar.c | 158 ++++++++++++++++++
.../testing/selftests/powerpc/ptrace/ptrace-tar.h | 50 ++++++
tools/testing/selftests/powerpc/ptrace/ptrace.h | 181 +++++++++++++++++++++
4 files changed, 391 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/powerpc/ptrace/ptrace-tar.c
create mode 100644 tools/testing/selftests/powerpc/ptrace/ptrace-tar.h

diff --git a/tools/testing/selftests/powerpc/ptrace/Makefile b/tools/testing/selftests/powerpc/ptrace/Makefile
index d0f000c..c794057 100644
--- a/tools/testing/selftests/powerpc/ptrace/Makefile
+++ b/tools/testing/selftests/powerpc/ptrace/Makefile
@@ -1,4 +1,5 @@
-TEST_PROGS := ptrace-ebb ptrace-gpr ptrace-tm-gpr ptrace-tm-spd-gpr
+TEST_PROGS := ptrace-ebb ptrace-gpr ptrace-tm-gpr ptrace-tm-spd-gpr \
+ptrace-tar

all: $(TEST_PROGS)
CFLAGS += -m64
diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-tar.c b/tools/testing/selftests/powerpc/ptrace/ptrace-tar.c
new file mode 100644
index 0000000..9af3fd7
--- /dev/null
+++ b/tools/testing/selftests/powerpc/ptrace/ptrace-tar.c
@@ -0,0 +1,158 @@
+/*
+ * 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;
+volatile int *cptr;
+volatile 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]);
+
+ 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];
+ int ret;
+
+ ret = start_trace(child);
+ if (ret)
+ return TEST_FAIL;
+
+ ret = show_tar_registers(child, reg);
+ if (ret)
+ return TEST_FAIL;
+
+ printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
+ ptrace_read_running, reg[0], reg[1], reg[2]);
+
+ ret = validate_tar_registers(reg, TAR_1, PPR_1, DSCR_1);
+ if (ret)
+ return TEST_FAIL;
+
+ ret = stop_trace(child);
+ if (ret)
+ return TEST_FAIL;
+
+ return TEST_PASS;
+}
+
+int trace_tar_write(pid_t child)
+{
+ int ret;
+
+ ret = start_trace(child);
+ if (ret)
+ return TEST_FAIL;
+
+ ret = write_tar_registers(child, TAR_2, PPR_2, DSCR_2);
+ if (ret)
+ return TEST_FAIL;
+
+ printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
+ ptrace_write_running, TAR_2, PPR_2, DSCR_2);
+
+ ret = stop_trace(child);
+ if (ret)
+ return TEST_FAIL;
+
+ 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]);
+ 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]);
+
+ shmdt((int *)pptr);
+
+ ret = wait(&status);
+ if (ret != pid) {
+ printf("Child's exit status not captured\n");
+ return TEST_PASS;
+ }
+
+ if (WIFEXITED(status)) {
+ if (WEXITSTATUS(status))
+ return TEST_FAIL;
+ }
+ return TEST_PASS;
+ }
+ return TEST_PASS;
+}
+
+int main(int argc, char *argv[])
+{
+ return test_harness(ptrace_tar, "ptrace_tar");
+}
diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-tar.h b/tools/testing/selftests/powerpc/ptrace/ptrace-tar.h
new file mode 100644
index 0000000..aed0aac
--- /dev/null
+++ b/tools/testing/selftests/powerpc/ptrace/ptrace-tar.h
@@ -0,0 +1,50 @@
+/*
+ * 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;
+}
diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace.h b/tools/testing/selftests/powerpc/ptrace/ptrace.h
index b6df47f..b9ab0b1 100644
--- a/tools/testing/selftests/powerpc/ptrace/ptrace.h
+++ b/tools/testing/selftests/powerpc/ptrace/ptrace.h
@@ -172,6 +172,187 @@ fail:
return TEST_FAIL;
}

+/* 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)
{
--
1.8.3.1