| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright 2015, Laurent Dufour, IBM Corp. |
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| 5 | * |
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| 6 | * Test the kernel's signal returning code to check reclaim is done if the |
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| 7 | * sigreturn() is called while in a transaction (suspended since active is |
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| 8 | * already dropped trough the system call path). |
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| 9 | * |
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| 10 | * The kernel must discard the transaction when entering sigreturn, since |
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| 11 | * restoring the potential TM SPRS from the signal frame is requiring to not be |
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| 12 | * in a transaction. |
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| 13 | */ |
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| 14 | |
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| 15 | #include <signal.h> |
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| 16 | #include <stdio.h> |
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| 17 | #include <stdlib.h> |
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| 18 | #include <string.h> |
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| 19 | #include <sys/types.h> |
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| 20 | #include <sys/wait.h> |
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| 21 | #include <unistd.h> |
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| 22 | |
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| 23 | #include "tm.h" |
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| 24 | #include "utils.h" |
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| 25 | |
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| 26 | |
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| 27 | void handler(int sig) |
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| 28 | { |
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| 29 | uint64_t ret; |
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| 30 | |
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| 31 | asm __volatile__( |
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| 32 | "li 3,1 ;" |
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| 33 | "tbegin. ;" |
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| 34 | "beq 1f ;" |
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| 35 | "li 3,0 ;" |
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| 36 | "tsuspend. ;" |
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| 37 | "1: ;" |
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| 38 | "std%X[ret] 3, %[ret] ;" |
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| 39 | : [ret] "=m" (ret) |
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| 40 | : |
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| 41 | : "memory" , "3" , "cr0" ); |
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| 42 | |
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| 43 | if (ret) |
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| 44 | exit(1); |
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| 45 | |
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| 46 | /* |
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| 47 | * We return from the signal handle while in a suspended transaction |
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| 48 | */ |
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| 49 | } |
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| 50 | |
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| 51 | |
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| 52 | int tm_sigreturn(void) |
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| 53 | { |
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| 54 | struct sigaction sa; |
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| 55 | uint64_t ret = 0; |
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| 56 | |
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| 57 | SKIP_IF(!have_htm()); |
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| 58 | SKIP_IF(htm_is_synthetic()); |
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| 59 | SKIP_IF(!is_ppc64le()); |
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| 60 | |
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| 61 | memset(&sa, 0, sizeof(sa)); |
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| 62 | sa.sa_handler = handler; |
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| 63 | sigemptyset(&sa.sa_mask); |
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| 64 | |
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| 65 | if (sigaction(SIGSEGV, &sa, NULL)) |
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| 66 | exit(1); |
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| 67 | |
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| 68 | asm __volatile__( |
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| 69 | "tbegin. ;" |
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| 70 | "beq 1f ;" |
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| 71 | "li 3,0 ;" |
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| 72 | "std 3,0(3) ;" /* trigger SEGV */ |
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| 73 | "li 3,1 ;" |
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| 74 | "std%X[ret] 3,%[ret] ;" |
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| 75 | "tend. ;" |
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| 76 | "b 2f ;" |
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| 77 | "1: ;" |
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| 78 | "li 3,2 ;" |
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| 79 | "std%X[ret] 3,%[ret] ;" |
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| 80 | "2: ;" |
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| 81 | : [ret] "=m" (ret) |
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| 82 | : |
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| 83 | : "memory" , "3" , "cr0" ); |
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| 84 | |
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| 85 | if (ret != 2) |
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| 86 | exit(1); |
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| 87 | |
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| 88 | exit(0); |
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| 89 | } |
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| 90 | |
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| 91 | int main(void) |
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| 92 | { |
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| 93 | return test_harness(tm_sigreturn, "tm_sigreturn" ); |
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| 94 | } |
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| 95 | |
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