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    Subject[PATCH v14 07/15] selftests/powerpc: Add ptrace tests for TAR, PPR, DSCR registers
    Date
    From: Anshuman Khandual <khandual@linux.vnet.ibm.com>

    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>
    ---
    tools/testing/selftests/powerpc/ptrace/Makefile | 3 +-
    .../testing/selftests/powerpc/ptrace/ptrace-tar.c | 159 ++++++++++++++++++
    .../testing/selftests/powerpc/ptrace/ptrace-tar.h | 50 ++++++
    tools/testing/selftests/powerpc/ptrace/ptrace.h | 181 +++++++++++++++++++++
    4 files changed, 392 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..e7d5938
    --- /dev/null
    +++ b/tools/testing/selftests/powerpc/ptrace/ptrace-tar.c
    @@ -0,0 +1,159 @@
    +/*
    + * 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);
    + shmctl(shm_id, IPC_RMID, NULL);
    + 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 1019004..86d58a9 100644
    --- a/tools/testing/selftests/powerpc/ptrace/ptrace.h
    +++ b/tools/testing/selftests/powerpc/ptrace/ptrace.h
    @@ -157,6 +157,187 @@ 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
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