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104 lines
2.2 KiB
104 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright 2015, Michael Neuling, IBM Corp. |
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* |
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* Original: Michael Neuling 4/12/2013 |
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* Edited: Rashmica Gupta 4/12/2015 |
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* |
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* See if the altivec state is leaked out of an aborted transaction due to |
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* kernel vmx copy loops. |
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* |
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* When the transaction aborts, VSR values should rollback to the values |
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* they held before the transaction commenced. Using VSRs while transaction |
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* is suspended should not affect the checkpointed values. |
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* |
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* (1) write A to a VSR |
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* (2) start transaction |
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* (3) suspend transaction |
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* (4) change the VSR to B |
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* (5) trigger kernel vmx copy loop |
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* (6) abort transaction |
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* (7) check that the VSR value is A |
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*/ |
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#include <inttypes.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <sys/mman.h> |
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#include <string.h> |
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#include <assert.h> |
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#include "tm.h" |
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#include "utils.h" |
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int test_vmxcopy() |
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{ |
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long double vecin = 1.3; |
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long double vecout; |
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unsigned long pgsize = getpagesize(); |
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int i; |
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int fd; |
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int size = pgsize*16; |
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char tmpfile[] = "/tmp/page_faultXXXXXX"; |
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char buf[pgsize]; |
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char *a; |
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uint64_t aborted = 0; |
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SKIP_IF(!have_htm()); |
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SKIP_IF(!is_ppc64le()); |
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fd = mkstemp(tmpfile); |
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assert(fd >= 0); |
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memset(buf, 0, pgsize); |
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for (i = 0; i < size; i += pgsize) |
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assert(write(fd, buf, pgsize) == pgsize); |
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unlink(tmpfile); |
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a = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0); |
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assert(a != MAP_FAILED); |
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asm __volatile__( |
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"lxvd2x 40,0,%[vecinptr];" /* set 40 to initial value*/ |
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"tbegin.;" |
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"beq 3f;" |
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"tsuspend.;" |
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"xxlxor 40,40,40;" /* set 40 to 0 */ |
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"std 5, 0(%[map]);" /* cause kernel vmx copy page */ |
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"tabort. 0;" |
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"tresume.;" |
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"tend.;" |
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"li %[res], 0;" |
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"b 5f;" |
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/* Abort handler */ |
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"3:;" |
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"li %[res], 1;" |
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"5:;" |
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"stxvd2x 40,0,%[vecoutptr];" |
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: [res]"=&r"(aborted) |
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: [vecinptr]"r"(&vecin), |
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[vecoutptr]"r"(&vecout), |
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[map]"r"(a) |
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: "memory", "r0", "r3", "r4", "r5", "r6", "r7"); |
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if (aborted && (vecin != vecout)){ |
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printf("FAILED: vector state leaked on abort %f != %f\n", |
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(double)vecin, (double)vecout); |
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return 1; |
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} |
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munmap(a, size); |
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close(fd); |
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return 0; |
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} |
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int main(void) |
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{ |
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return test_harness(test_vmxcopy, "tm_vmxcopy"); |
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}
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