cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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tm-signal-sigreturn-nt.c (1060B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright 2018, Breno Leitao, Gustavo Romero, IBM Corp.
      4 *
      5 * A test case that creates a signal and starts a suspended transaction
      6 * inside the signal handler.
      7 *
      8 * It returns from the signal handler with the CPU at suspended state, but
      9 * without setting usercontext MSR Transaction State (TS) fields.
     10 */
     11
     12#define _GNU_SOURCE
     13#include <stdio.h>
     14#include <stdlib.h>
     15#include <signal.h>
     16
     17#include "utils.h"
     18#include "tm.h"
     19
     20void trap_signal_handler(int signo, siginfo_t *si, void *uc)
     21{
     22	ucontext_t *ucp = (ucontext_t *) uc;
     23
     24	asm("tbegin.; tsuspend.;");
     25
     26	/* Skip 'trap' instruction if it succeed */
     27	ucp->uc_mcontext.regs->nip += 4;
     28}
     29
     30int tm_signal_sigreturn_nt(void)
     31{
     32	struct sigaction trap_sa;
     33
     34	SKIP_IF(!have_htm());
     35	SKIP_IF(htm_is_synthetic());
     36
     37	trap_sa.sa_flags = SA_SIGINFO;
     38	trap_sa.sa_sigaction = trap_signal_handler;
     39
     40	sigaction(SIGTRAP, &trap_sa, NULL);
     41
     42	raise(SIGTRAP);
     43
     44	return EXIT_SUCCESS;
     45}
     46
     47int main(int argc, char **argv)
     48{
     49	test_harness(tm_signal_sigreturn_nt, "tm_signal_sigreturn_nt");
     50}
     51