// SPDX-License-Identifier: GPL-2.0 /* * Copyright 2015, Laurent Dufour, IBM Corp. * * Test the kernel's signal returning code to check reclaim is done if the * sigreturn() is called while in a transaction (suspended since active is * already dropped trough the system call path). * * The kernel must discard the transaction when entering sigreturn, since * restoring the potential TM SPRS from the signal frame is requiring to not be * in a transaction. */ #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/types.h> #include <sys/wait.h> #include <unistd.h> #include "tm.h" #include "utils.h" void handler(int sig) { uint64_t ret; asm __volatile__( "li 3,1 ;" "tbegin. ;" "beq 1f ;" "li 3,0 ;" "tsuspend. ;" "1: ;" "std%X[ret] 3, %[ret] ;" : [ret] "=m"(ret) : : "memory", "3", "cr0"); if (ret) exit(1); /* * We return from the signal handle while in a suspended transaction */ } int tm_sigreturn(void) { struct sigaction sa; uint64_t ret = 0; SKIP_IF(!have_htm()); SKIP_IF(htm_is_synthetic()); SKIP_IF(!is_ppc64le()); memset(&sa, 0, sizeof(sa)); sa.sa_handler = handler; sigemptyset(&sa.sa_mask); if (sigaction(SIGSEGV, &sa, NULL)) exit(1); asm __volatile__( "tbegin. ;" "beq 1f ;" "li 3,0 ;" "std 3,0(3) ;" /* trigger SEGV */ "li 3,1 ;" "std%X[ret] 3,%[ret] ;" "tend. ;" "b 2f ;" "1: ;" "li 3,2 ;" "std%X[ret] 3,%[ret] ;" "2: ;" : [ret] "=m"(ret) : : "memory", "3", "cr0"); if (ret != 2) exit(1); exit(0); } int main(void) { return test_harness(tm_sigreturn, "tm_sigreturn"); }