AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-14 19:56:52 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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 16:18:22 +10:00 committed by Michael Ellerman
parent 5ca4ffcd5c
commit 7bb0e7e38b
2 changed files with 112 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
tools/testing/selftests/powerpc/tm/Makefile
View File

@ -1,4 +1,5 @@
SIGNAL_CONTEXT_CHK_TESTS := tm-signal-context-chk-gpr tm-signal-context-chk-fpu
SIGNAL_CONTEXT_CHK_TESTS := tm-signal-context-chk-gpr tm-signal-context-chk-fpu \
tm-signal-context-chk-vmx
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)

110
tools/testing/selftests/powerpc/tm/tm-signal-context-chk-vmx.c Normal file
View File

@ -0,0 +1,110 @@
/*
* 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 <string.h>
#include <signal.h>
#include <unistd.h>
#include <altivec.h>
#include "utils.h"
#include "tm.h"
#define MAX_ATTEMPT 500000
#define NV_VMX_REGS 12
long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss);
static sig_atomic_t fail;
vector int vms[] = {
{1, 2, 3, 4 },{5, 6, 7, 8 },{9, 10,11,12},
{13,14,15,16},{17,18,19,20},{21,22,23,24},
{25,26,27,28},{29,30,31,32},{33,34,35,36},
{37,38,39,40},{41,42,43,44},{45,46,47,48},
{-1, -2, -3, -4}, {-5, -6, -7, -8}, {-9, -10,-11,-12},
{-13,-14,-15,-16},{-17,-18,-19,-20},{-21,-22,-23,-24},
{-25,-26,-27,-28},{-29,-30,-31,-32},{-33,-34,-35,-36},
{-37,-38,-39,-40},{-41,-42,-43,-44},{-45,-46,-47,-48}
};
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_VMX_REGS && !fail; i++) {
fail = memcmp(ucp->uc_mcontext.v_regs->vrregs[i + 20],
&vms[i], sizeof(vector int));
fail |= memcmp(tm_ucp->uc_mcontext.v_regs->vrregs[i + 20],
&vms[i + NV_VMX_REGS], sizeof (vector int));
if (fail) {
int j;
fprintf(stderr, "Failed on %d vmx 0x", i);
for (j = 0; j < 4; j++)
fprintf(stderr, "%04x", ucp->uc_mcontext.v_regs->vrregs[i + 20][j]);
fprintf(stderr, " vs 0x");
for (j = 0 ; j < 4; j++)
fprintf(stderr, "%04x", tm_ucp->uc_mcontext.v_regs->vrregs[i + 20][j]);
fprintf(stderr, "\n");
}
}
}
static int tm_signal_context_chk()
{
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, NULL, vms, NULL);
FAIL_IF(rc != pid);
i++;
}
return fail;
}
int main(void)
{
return test_harness(tm_signal_context_chk, "tm_signal_context_chk_vmx");
}