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    Subject[PATCH v12 24/30] selftests/powerpc: Add ptrace tests for TAR, PPR, DSCR in suspended TM
    Date
    From: Anshuman Khandual <khandual@linux.vnet.ibm.com>

    This patch adds ptrace interface test for TAR, PPR, DSCR
    registers inside suspended TM context.

    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 | 2 +-
    .../selftests/powerpc/ptrace/ptrace-tm-spd-tar.c | 195 +++++++++++++++++++++
    2 files changed, 196 insertions(+), 1 deletion(-)
    create mode 100644 tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-tar.c

    diff --git a/tools/testing/selftests/powerpc/ptrace/Makefile b/tools/testing/selftests/powerpc/ptrace/Makefile
    index 77d7a13..2916759 100644
    --- a/tools/testing/selftests/powerpc/ptrace/Makefile
    +++ b/tools/testing/selftests/powerpc/ptrace/Makefile
    @@ -1,5 +1,5 @@
    TEST_PROGS := ptrace-ebb ptrace-gpr ptrace-tm-gpr ptrace-tm-spd-gpr \
    -ptrace-tar ptrace-tm-tar
    +ptrace-tar ptrace-tm-tar ptrace-tm-spd-tar

    all: $(TEST_PROGS)
    CFLAGS += -m64
    diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-tar.c b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-tar.c
    new file mode 100644
    index 0000000..da4c477
    --- /dev/null
    +++ b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-tar.c
    @@ -0,0 +1,195 @@
    +/*
    + * Ptrace test for TAR, PPR, DSCR registers in the TM Suspend context
    + *
    + * 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"
    +
    +int shm_id;
    +volatile int *cptr, *pptr;
    +
    +__attribute__((used)) void wait_parent(void)
    +{
    + cptr[2] = 1;
    + while (!cptr[1]);
    +}
    +
    +void tm_spd_tar(void)
    +{
    + unsigned long result, texasr;
    + unsigned long regs[3];
    + int ret;
    +
    + cptr = (int *)shmat(shm_id, NULL, 0);
    +
    +trans:
    + cptr[2] = 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 4, %[tar_3];"
    + "mtspr %[sprn_tar], 4;" /* TAR_3 */
    + "li 4, %[dscr_3];"
    + "mtspr %[sprn_dscr], 4;" /* DSCR_3 */
    + "or 6,6,6;" /* PPR_3 */
    + "bl wait_parent;"
    + TRESUME
    +
    + 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)
    + : [val] "r" (cptr[1]), [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),
    + [tar_3]"i"(TAR_3), [dscr_3]"i"(DSCR_3)
    + : "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_spd_tar(pid_t child)
    +{
    + unsigned long regs[3];
    + int ret;
    +
    + ret = start_trace(child);
    + if (ret)
    + return TEST_FAIL;
    +
    + ret = show_tar_registers(child, regs);
    + if (ret)
    + return TEST_FAIL;
    +
    + printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
    + ptrace_read_running, regs[0], regs[1], regs[2]);
    +
    + ret = validate_tar_registers(regs, TAR_3, PPR_3, DSCR_3);
    + if (ret)
    + return TEST_FAIL;
    +
    + ret = show_tm_checkpointed_state(child, regs);
    + if (ret)
    + return TEST_FAIL;
    +
    + printf("%-30s TAR: %lu PPR: %lx DSCR: %lu\n",
    + ptrace_read_ckpt, regs[0], regs[1], regs[2]);
    +
    + ret = validate_tar_registers(regs, TAR_1, PPR_1, DSCR_1);
    + if (ret)
    + return TEST_FAIL;
    +
    + ret = write_ckpt_tar_registers(child, TAR_4, PPR_4, DSCR_4);
    + if (ret)
    + return TEST_FAIL;
    +
    + printf("%-30s TAR: %u PPR: %lx DSCR: %u\n",
    + ptrace_write_ckpt, TAR_4, PPR_4, DSCR_4);
    +
    + pptr[0] = 1;
    + pptr[1] = 1;
    + ret = stop_trace(child);
    + if (ret)
    + return TEST_FAIL;
    + return TEST_PASS;
    +}
    +
    +int ptrace_tm_spd_tar(void)
    +{
    + pid_t pid;
    + int ret, status;
    +
    + SKIP_IF(!((long)get_auxv_entry(AT_HWCAP2) & PPC_FEATURE2_HTM));
    + shm_id = shmget(IPC_PRIVATE, sizeof(int) * 3, 0777|IPC_CREAT);
    + pid = fork();
    + if (pid == 0)
    + tm_spd_tar();
    +
    + pptr = (int *)shmat(shm_id, NULL, 0);
    + pptr[0] = 0;
    + pptr[1] = 0;
    +
    + if (pid) {
    + while (!pptr[2]);
    + ret = trace_tm_spd_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;
    + }
    +
    + 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_tm_spd_tar, "ptrace_tm_spd_tar");
    +}
    --
    1.8.3.1
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