126 lines
3.4 KiB
C
Executable file
126 lines
3.4 KiB
C
Executable file
/*
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* Copyright 2016, Cyril Bur, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*
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* Test the kernel's signal frame code.
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*
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* The kernel sets up two sets of ucontexts if the signal was to be
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* delivered while the thread was in a transaction.
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* Expected behaviour is that the checkpointed state is in the user
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* context passed to the signal handler. The speculated state can be
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* accessed with the uc_link pointer.
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*
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* The rationale for this is that if TM unaware code (which linked
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* against TM libs) installs a signal handler it will not know of the
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* speculative nature of the 'live' registers and may infer the wrong
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* thing.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <signal.h>
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#include <unistd.h>
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#include <altivec.h>
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#include "utils.h"
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#include "tm.h"
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#define MAX_ATTEMPT 500000
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#define NV_VSX_REGS 12
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long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss);
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static sig_atomic_t fail;
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vector int vss[] = {
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{1, 2, 3, 4 },{5, 6, 7, 8 },{9, 10,11,12},
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{13,14,15,16},{17,18,19,20},{21,22,23,24},
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{25,26,27,28},{29,30,31,32},{33,34,35,36},
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{37,38,39,40},{41,42,43,44},{45,46,47,48},
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{-1, -2, -3, -4 },{-5, -6, -7, -8 },{-9, -10,-11,-12},
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{-13,-14,-15,-16},{-17,-18,-19,-20},{-21,-22,-23,-24},
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{-25,-26,-27,-28},{-29,-30,-31,-32},{-33,-34,-35,-36},
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{-37,-38,-39,-40},{-41,-42,-43,-44},{-45,-46,-47,-48}
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};
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static void signal_usr1(int signum, siginfo_t *info, void *uc)
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{
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int i;
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uint8_t vsc[sizeof(vector int)];
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uint8_t vst[sizeof(vector int)];
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ucontext_t *ucp = uc;
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ucontext_t *tm_ucp = ucp->uc_link;
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/*
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* The other half of the VSX regs will be after v_regs.
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*
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* In short, vmx_reserve array holds everything. v_regs is a 16
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* byte aligned pointer at the start of vmx_reserve (vmx_reserve
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* may or may not be 16 aligned) where the v_regs structure exists.
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* (half of) The VSX regsters are directly after v_regs so the
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* easiest way to find them below.
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*/
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long *vsx_ptr = (long *)(ucp->uc_mcontext.v_regs + 1);
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long *tm_vsx_ptr = (long *)(tm_ucp->uc_mcontext.v_regs + 1);
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for (i = 0; i < NV_VSX_REGS && !fail; i++) {
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memcpy(vsc, &ucp->uc_mcontext.fp_regs[i + 20], 8);
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memcpy(vsc + 8, &vsx_ptr[20 + i], 8);
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fail = memcmp(vsc, &vss[i], sizeof(vector int));
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memcpy(vst, &tm_ucp->uc_mcontext.fp_regs[i + 20], 8);
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memcpy(vst + 8, &tm_vsx_ptr[20 + i], 8);
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fail |= memcmp(vst, &vss[i + NV_VSX_REGS], sizeof(vector int));
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if (fail) {
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int j;
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fprintf(stderr, "Failed on %d vsx 0x", i);
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for (j = 0; j < 16; j++)
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fprintf(stderr, "%02x", vsc[j]);
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fprintf(stderr, " vs 0x");
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for (j = 0; j < 16; j++)
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fprintf(stderr, "%02x", vst[j]);
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fprintf(stderr, "\n");
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}
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}
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}
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static int tm_signal_context_chk()
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{
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struct sigaction act;
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int i;
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long rc;
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pid_t pid = getpid();
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SKIP_IF(!have_htm());
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act.sa_sigaction = signal_usr1;
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sigemptyset(&act.sa_mask);
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act.sa_flags = SA_SIGINFO;
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if (sigaction(SIGUSR1, &act, NULL) < 0) {
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perror("sigaction sigusr1");
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exit(1);
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}
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i = 0;
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while (i < MAX_ATTEMPT && !fail) {
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rc = tm_signal_self_context_load(pid, NULL, NULL, NULL, vss);
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FAIL_IF(rc != pid);
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i++;
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}
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return fail;
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}
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int main(void)
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{
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return test_harness(tm_signal_context_chk, "tm_signal_context_chk_vsx");
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}
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