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Transactional Memory was removed from the architecture in ISA v3.1. For threads running in P8/P9 compatibility mode on P10 a synthetic TM implementation is provided. In this implementation, tbegin. always sets cr0 eq meaning the abort handler is always called. This is not an issue as users of TM are expected to have a fallback non transactional way to make forward progress in the abort handler. The TEXASR indicates if a transaction failure is due to a synthetic implementation. Some of the TM self tests need a non-degenerate TM implementation for their testing to be meaningful so check for a synthetic implementation and skip the test if so. Signed-off-by: Jordan Niethe <jniethe5@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210729041317.366612-2-jniethe5@gmail.com
68 lines
1.2 KiB
C
68 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2016, Cyril Bur, IBM Corp.
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*
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* Syscalls can be performed provided the transactions are suspended.
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* The exec() class of syscall is unique as a new process is loaded.
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*
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* It makes little sense for after an exec() call for the previously
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* suspended transaction to still exist.
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*/
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#define _GNU_SOURCE
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#include <errno.h>
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#include <inttypes.h>
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#include <libgen.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "utils.h"
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#include "tm.h"
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static char *path;
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static int test_exec(void)
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{
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SKIP_IF(!have_htm());
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SKIP_IF(htm_is_synthetic());
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asm __volatile__(
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"tbegin.;"
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"blt 1f; "
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"tsuspend.;"
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"1: ;"
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: : : "memory");
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execl(path, "tm-exec", "--child", NULL);
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/* Shouldn't get here */
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perror("execl() failed");
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return 1;
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}
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static int after_exec(void)
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{
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asm __volatile__(
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"tbegin.;"
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"blt 1f;"
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"tsuspend.;"
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"1: ;"
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: : : "memory");
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FAIL_IF(failure_is_nesting());
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return 0;
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}
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int main(int argc, char *argv[])
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{
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path = argv[0];
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if (argc > 1 && strcmp(argv[1], "--child") == 0)
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return after_exec();
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return test_harness(test_exec, "tm_exec");
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}
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