On Mon, 2016-09-12 at 15:33 +0800, wei.guo.simon@xxxxxxxxx wrote:
> From: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Simon Guo <wei.guo.simon@xxxxxxxxx>
> ---
> 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
>
[snip]
> +
> +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];
> + 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;
> +}
More comments about calling TEST_FAIL(x)
> +
> +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) {
>
[snip]
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