// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2016, Cyril Bur, IBM Corp.
*
* 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_VSX_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 vss[] = {
{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;
uint8_t vsc[sizeof(vector int)];
uint8_t vst[sizeof(vector int)];
ucontext_t *ucp = uc;
ucontext_t *tm_ucp = ucp->uc_link;
/*
* The other half of the VSX regs will be after v_regs.
*
* In short, vmx_reserve array holds everything. v_regs is a 16
* byte aligned pointer at the start of vmx_reserve (vmx_reserve
* may or may not be 16 aligned) where the v_regs structure exists.
* (half of) The VSX regsters are directly after v_regs so the
* easiest way to find them below.
*/
long *vsx_ptr = (long *)(ucp->uc_mcontext.v_regs + 1);
long *tm_vsx_ptr = (long *)(tm_ucp->uc_mcontext.v_regs + 1);
for (i = 0; i < NV_VSX_REGS && !fail; i++) {
memcpy(vsc, &ucp->uc_mcontext.fp_regs[i + 20], 8);
memcpy(vsc + 8, &vsx_ptr[20 + i], 8);
fail = memcmp(vsc, &vss[i], sizeof(vector int));
memcpy(vst, &tm_ucp->uc_mcontext.fp_regs[i + 20], 8);
memcpy(vst + 8, &tm_vsx_ptr[20 + i], 8);
fail |= memcmp(vst, &vss[i + NV_VSX_REGS], sizeof(vector int));
if (fail) {
int j;
fprintf(stderr, "Failed on %d vsx 0x", i);
for (j = 0; j < 16; j++)
fprintf(stderr, "%02x", vsc[j]);
fprintf(stderr, " vs 0x");
for (j = 0; j < 16; j++)
fprintf(stderr, "%02x", vst[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, NULL, vss);
FAIL_IF(rc != pid);
i++;
}
return fail;
}
int main(void)
{
return test_harness(tm_signal_context_chk, "tm_signal_context_chk_vsx");
}
