104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
/*
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* Copyright 2015, Michael Neuling, IBM Corp.
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* Licensed under GPLv2.
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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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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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