From 5bdac52f3c67e1262b1979081a362fdedebd2ed2 Mon Sep 17 00:00:00 2001 From: Anshuman Khandual Date: Fri, 30 Sep 2016 10:33:02 +0800 Subject: [PATCH] selftests/powerpc: Add ptrace tests for TM SPR registers This patch adds ptrace interface test for TM SPR registers. This also adds ptrace interface based helper functions related to TM SPR registers access. Signed-off-by: Anshuman Khandual Signed-off-by: Simon Guo Signed-off-by: Michael Ellerman --- .../selftests/powerpc/ptrace/.gitignore | 1 + .../testing/selftests/powerpc/ptrace/Makefile | 2 +- .../selftests/powerpc/ptrace/ptrace-tm-spr.c | 168 ++++++++++++++++++ .../testing/selftests/powerpc/ptrace/ptrace.h | 35 ++++ 4 files changed, 205 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/powerpc/ptrace/ptrace-tm-spr.c diff --git a/tools/testing/selftests/powerpc/ptrace/.gitignore b/tools/testing/selftests/powerpc/ptrace/.gitignore index 49439538e234..349acfafc95b 100644 --- a/tools/testing/selftests/powerpc/ptrace/.gitignore +++ b/tools/testing/selftests/powerpc/ptrace/.gitignore @@ -7,3 +7,4 @@ ptrace-tm-spd-tar ptrace-vsx ptrace-tm-vsx ptrace-tm-spd-vsx +ptrace-tm-spr diff --git a/tools/testing/selftests/powerpc/ptrace/Makefile b/tools/testing/selftests/powerpc/ptrace/Makefile index f3f4129b3755..fe6bc60dfc60 100644 --- a/tools/testing/selftests/powerpc/ptrace/Makefile +++ b/tools/testing/selftests/powerpc/ptrace/Makefile @@ -1,6 +1,6 @@ TEST_PROGS := 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 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 000000000000..94e57cb89769 --- /dev/null +++ b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spr.c @@ -0,0 +1,168 @@ +/* + * 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" +#include "tm.h" + +/* Tracee and tracer shared data */ +struct shared { + int flag; + struct tm_spr_regs regs; +}; +unsigned long tfhar; + +int shm_id; +struct shared *cptr, *pptr; + +int shm_id1; +int *cptr1, *pptr1; + +#define TM_KVM_SCHED 0xe0000001ac000001 +int validate_tm_spr(struct tm_spr_regs *regs) +{ + FAIL_IF(regs->tm_tfhar != tfhar); + FAIL_IF((regs->tm_texasr == TM_KVM_SCHED) && (regs->tm_tfiar != 0)); + + 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: ;" + /* TM failover handler should follow "tbegin.;" */ + "mflr 31;" + "bl 4f;" /* $ = TFHAR - 12 */ + "4: ;" + "mflr %[tfhar];" + "mtlr 31;" + + "tbegin.;" + "beq 2f;" + + "tsuspend.;" + "li 8, 1;" + "sth 8, 0(%[cptr1]);" + "tresume.;" + "b .;" + + "tend.;" + "li 0, 0;" + "ori %[res], 0, 0;" + "b 3f;" + + "2: ;" + + "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" + ); + + /* There are 2 32bit instructions before tbegin. */ + tfhar += 12; + + 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) +{ + FAIL_IF(start_trace(child)); + FAIL_IF(show_tm_spr(child, (struct tm_spr_regs *)&pptr->regs)); + + printf("TFHAR: %lx TEXASR: %lx TFIAR: %lx\n", pptr->regs.tm_tfhar, + pptr->regs.tm_texasr, pptr->regs.tm_tfiar); + + pptr->flag = 1; + FAIL_IF(stop_trace(child)); + + return TEST_PASS; +} + +int ptrace_tm_spr(void) +{ + pid_t pid; + int ret, status; + + SKIP_IF(!have_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]) + asm volatile("" : : : "memory"); + ret = trace_tm_spr(pid); + if (ret) { + kill(pid, SIGKILL); + shmdt((void *)pptr); + shmdt((void *)pptr1); + shmctl(shm_id, IPC_RMID, NULL); + shmctl(shm_id1, IPC_RMID, NULL); + return TEST_FAIL; + } + + shmdt((void *)pptr); + shmdt((void *)pptr1); + ret = wait(&status); + shmctl(shm_id, IPC_RMID, NULL); + shmctl(shm_id1, IPC_RMID, NULL); + if (ret != pid) { + printf("Child's exit status not captured\n"); + return TEST_FAIL; + } + + return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL : + 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 9aa0498ac738..19fb825270a1 100644 --- a/tools/testing/selftests/powerpc/ptrace/ptrace.h +++ b/tools/testing/selftests/powerpc/ptrace/ptrace.h @@ -38,6 +38,11 @@ struct fpr_regs { unsigned long fpscr; }; +struct tm_spr_regs { + unsigned long tm_tfhar; + unsigned long tm_texasr; + unsigned long tm_tfiar; +}; #ifndef NT_PPC_TAR #define NT_PPC_TAR 0x103 @@ -605,6 +610,36 @@ 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) { -- 2.39.5