From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752554AbcGQCEK (ORCPT ); Sat, 16 Jul 2016 22:04:10 -0400 Received: from mail-pa0-f67.google.com ([209.85.220.67]:33675 "EHLO mail-pa0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751909AbcGQCEE (ORCPT ); Sat, 16 Jul 2016 22:04:04 -0400 From: wei.guo.simon@gmail.com To: Michael Ellerman Cc: Anshuman Khandual , Benjamin Herrenschmidt , Paul Mackerras , Shuah Khan , Anton Blanchard , Cyril Bur , Simon Guo , Ulrich Weigand , Michael Neuling , Andrew Morton , Kees Cook , Rashmica Gupta , Khem Raj , Jessica Yu , Jiri Kosina , Miroslav Benes , Suraj Jitindar Singh , Chris Smart , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH v11 25/27] selftests/powerpc: Add ptrace tests for TM SPR registers Date: Sun, 17 Jul 2016 09:59:58 +0800 Message-Id: <1468720800-2950-26-git-send-email-wei.guo.simon@gmail.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1468720800-2950-1-git-send-email-wei.guo.simon@gmail.com> References: <1468720800-2950-1-git-send-email-wei.guo.simon@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Anshuman Khandual This patch adds ptrace interface test for TM SPR registers. This also adds ptrace interface based helper functions related to TM SPR registers access. Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: Shuah Khan Cc: Anton Blanchard Cc: Cyril Bur Cc: Anshuman Khandual Cc: Simon Guo Cc: Ulrich Weigand Cc: Michael Neuling Cc: Andrew Morton Cc: Kees Cook Cc: Rashmica Gupta Cc: Khem Raj Cc: Jessica Yu Cc: Jiri Kosina Cc: Miroslav Benes Cc: Suraj Jitindar Singh Cc: Chris Smart Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Cc: linux-kselftest@vger.kernel.org Signed-off-by: Anshuman Khandual Signed-off-by: Simon Guo --- tools/testing/selftests/powerpc/ptrace/Makefile | 3 +- .../selftests/powerpc/ptrace/ptrace-tm-spr.c | 175 +++++++++++++++++++++ tools/testing/selftests/powerpc/ptrace/ptrace.h | 35 +++++ 3 files changed, 212 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/powerpc/ptrace/ptrace-tm-spr.c diff --git a/tools/testing/selftests/powerpc/ptrace/Makefile b/tools/testing/selftests/powerpc/ptrace/Makefile index 797840a..f34670e 100644 --- a/tools/testing/selftests/powerpc/ptrace/Makefile +++ b/tools/testing/selftests/powerpc/ptrace/Makefile @@ -1,7 +1,8 @@ TEST_PROGS := ptrace-ebb ptrace-gpr ptrace-tm-gpr ptrace-tm-spd-gpr \ ptrace-tar ptrace-tm-tar ptrace-tm-spd-tar ptrace-vsx ptrace-tm-vsx \ -ptrace-tm-spd-vsx +ptrace-tm-spd-vsx ptrace-tm-spr +include ../../lib.mk all: $(TEST_PROGS) CFLAGS += -m64 diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spr.c b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spr.c new file mode 100644 index 0000000..9d7f37d --- /dev/null +++ b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spr.c @@ -0,0 +1,175 @@ +/* + * Ptrace test TM SPR 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" + +/* Tracee and tracer shared data */ +struct shared { + int flag; + struct tm_spr_regs regs; +}; +unsigned long tfhar; + +int shm_id; +volatile struct shared *cptr, *pptr; + +int shm_id1; +volatile int *cptr1, *pptr1; + +#define TM_SCHED 0xde0000018c000001 +#define TM_KVM_SCHED 0xe0000001ac000001 + +int validate_tm_spr(struct tm_spr_regs *regs) +{ + if (regs->tm_tfhar != (tfhar - 32)) + return TEST_FAIL; + + if ((regs->tm_texasr != TM_SCHED) && (regs->tm_texasr != TM_KVM_SCHED)) + return TEST_FAIL; + + if ((regs->tm_texasr == TM_KVM_SCHED) && (regs->tm_tfiar != 0)) + return TEST_FAIL; + + return TEST_PASS; +} + +void tm_spr(void) +{ + unsigned long result, texasr; + int ret; + + cptr = (struct shared *)shmat(shm_id, NULL, 0); + cptr1 = (int *)shmat(shm_id1, NULL, 0); + +trans: + cptr1[0] = 0; + asm __volatile__( + "1: ;" + TBEGIN + "beq 2f;" + + TSUSPEND + "li 8, 1;" + "sth 8, 0(%[cptr1]);" + TRESUME + "b .;" + + TEND + "li 0, 0;" + "ori %[res], 0, 0;" + "b 3f;" + + "2: ;" + "mflr 31;" + "bl 4f;" /* $ = TFHAR + 2 */ + "4: ;" + "mflr %[tfhar];" + "mtlr 31;" + + "li 0, 1;" + "ori %[res], 0, 0;" + "mfspr %[texasr], %[sprn_texasr];" + + "3: ;" + : [tfhar] "=r" (tfhar), [res] "=r" (result), + [texasr] "=r" (texasr), [cptr1] "=r" (cptr1) + : [sprn_texasr] "i" (SPRN_TEXASR) + : "memory", "r0", "r1", "r2", "r3", "r4", + "r8", "r9", "r10", "r11", "r31" + ); + + if (result) { + if (!cptr->flag) + goto trans; + + ret = validate_tm_spr((struct tm_spr_regs *)&cptr->regs); + shmdt((void *)cptr); + shmdt((void *)cptr1); + if (ret) + exit(1); + exit(0); + } + shmdt((void *)cptr); + shmdt((void *)cptr1); + exit(1); +} + +int trace_tm_spr(pid_t child) +{ + int ret; + + ret = start_trace(child); + if (ret) + return TEST_FAIL; + + ret = show_tm_spr(child, (struct tm_spr_regs *)&pptr->regs); + if (ret) + return TEST_FAIL; + + printf("TFHAR: %lx TEXASR: %lx TFIAR: %lx\n", pptr->regs.tm_tfhar, + pptr->regs.tm_texasr, pptr->regs.tm_tfiar); + + pptr->flag = 1; + ret = stop_trace(child); + if (ret) + return TEST_FAIL; + + return TEST_PASS; +} + +int ptrace_tm_spr(void) +{ + pid_t pid; + int ret, status; + + SKIP_IF(!((long)get_auxv_entry(AT_HWCAP2) & PPC_FEATURE2_HTM)); + shm_id = shmget(IPC_PRIVATE, sizeof(struct shared), 0777|IPC_CREAT); + shm_id1 = shmget(IPC_PRIVATE, sizeof(int), 0777|IPC_CREAT); + pid = fork(); + if (pid < 0) { + perror("fork() failed"); + return TEST_FAIL; + } + + if (pid == 0) + tm_spr(); + + if (pid) { + pptr = (struct shared *)shmat(shm_id, NULL, 0); + pptr1 = (int *)shmat(shm_id1, NULL, 0); + + while (!pptr1[0]); + ret = trace_tm_spr(pid); + if (ret) { + kill(pid, SIGKILL); + return TEST_FAIL; + } + + shmdt((void *)pptr); + shmdt((void *)pptr1); + ret = wait(&status); + 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_spr, "ptrace_tm_spr"); +} diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace.h b/tools/testing/selftests/powerpc/ptrace/ptrace.h index 442a9a0..ad9fb2e 100644 --- a/tools/testing/selftests/powerpc/ptrace/ptrace.h +++ b/tools/testing/selftests/powerpc/ptrace/ptrace.h @@ -67,6 +67,11 @@ struct fpr_regs { unsigned long fpscr; }; +struct tm_spr_regs { + unsigned long tm_tfhar; + unsigned long tm_texasr; + unsigned long tm_tfiar; +}; /* Basic ptrace operations */ int start_trace(pid_t child) @@ -680,6 +685,36 @@ int write_vsx_ckpt(pid_t child, unsigned long *vsx) return TEST_PASS; } +/* TM SPR */ +int show_tm_spr(pid_t child, struct tm_spr_regs *out) +{ + struct tm_spr_regs *regs; + struct iovec iov; + int ret; + + regs = (struct tm_spr_regs *) malloc(sizeof(struct tm_spr_regs)); + if (!regs) { + perror("malloc() failed"); + return TEST_FAIL; + } + + iov.iov_base = (u64 *) regs; + iov.iov_len = sizeof(struct tm_spr_regs); + + ret = ptrace(PTRACE_GETREGSET, child, NT_PPC_TM_SPR, &iov); + if (ret) { + perror("ptrace(PTRACE_GETREGSET) failed"); + return TEST_FAIL; + } + + if (out) + memcpy(out, regs, sizeof(struct tm_spr_regs)); + + return TEST_PASS; +} + + + /* Analyse TEXASR after TM failure */ inline unsigned long get_tfiar(void) { -- 1.8.3.1