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selftests/powerpc: Add checks for transactional FPUs in signal contexts

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If a thread receives a signal while transactional the kernel creates a
second context to show the transactional state of the process. This
test loads some known values and waits for a signal and confirms that
the expected values are in the signal context.

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Cyril Bur 2016-09-23 16:18:21 +10:00 committed by Michael Ellerman
parent f10d4424b2
commit 5ca4ffcd5c
2 changed files with 93 additions and 1 deletions
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2
tools/testing/selftests/powerpc/tm/Makefile
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@ -1,4 +1,4 @@
SIGNAL_CONTEXT_CHK_TESTS := tm-signal-context-chk-gpr
SIGNAL_CONTEXT_CHK_TESTS := tm-signal-context-chk-gpr tm-signal-context-chk-fpu
TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack \
tm-vmxcopy tm-fork tm-tar tm-tmspr $(SIGNAL_CONTEXT_CHK_TESTS)

92
tools/testing/selftests/powerpc/tm/tm-signal-context-chk-fpu.c Normal file
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@ -0,0 +1,92 @@
/*
* Copyright 2016, Cyril Bur, IBM Corp.
*
* 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.
*
*
* Test the kernel's signal frame code.
*
* The kernel sets up two sets of ucontexts if the signal was to be
* delivered while the thread was in a transaction.
* Expected behaviour is that the checkpointed state is in the user
* context passed to the signal handler. The speculated state can be
* accessed with the uc_link pointer.
*
* The rationale for this is that if TM unaware code (which linked
* against TM libs) installs a signal handler it will not know of the
* speculative nature of the 'live' registers and may infer the wrong
* thing.
*/
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <altivec.h>
#include "utils.h"
#include "tm.h"
#define MAX_ATTEMPT 500000
#define NV_FPU_REGS 18
long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss);
/* Be sure there are 2x as many as there are NV FPU regs (2x18) */
static double fps[] = {
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
-1,-2,-3,-4,-5,-6,-7,-8,-9,-10,-11,-12,-13,-14,-15,-16,-17,-18
};
static sig_atomic_t fail;
static void signal_usr1(int signum, siginfo_t *info, void *uc)
{
int i;
ucontext_t *ucp = uc;
ucontext_t *tm_ucp = ucp->uc_link;
for (i = 0; i < NV_FPU_REGS && !fail; i++) {
fail = (ucp->uc_mcontext.fp_regs[i + 14] != fps[i]);
fail |= (tm_ucp->uc_mcontext.fp_regs[i + 14] != fps[i + NV_FPU_REGS]);
if (fail)
printf("Failed on %d FP %g or %g\n", i, ucp->uc_mcontext.fp_regs[i + 14], tm_ucp->uc_mcontext.fp_regs[i + 14]);
}
}
static int tm_signal_context_chk_fpu()
{
struct sigaction act;
int i;
long rc;
pid_t pid = getpid();
SKIP_IF(!have_htm());
act.sa_sigaction = signal_usr1;
sigemptyset(&act.sa_mask);
act.sa_flags = SA_SIGINFO;
if (sigaction(SIGUSR1, &act, NULL) < 0) {
perror("sigaction sigusr1");
exit(1);
}
i = 0;
while (i < MAX_ATTEMPT && !fail) {
rc = tm_signal_self_context_load(pid, NULL, fps, NULL, NULL);
FAIL_IF(rc != pid);
i++;
}
return fail;
}
int main(void)
{
return test_harness(tm_signal_context_chk_fpu, "tm_signal_context_chk_fpu");
}