e42edf9b9d
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
44 lines
826 B
C
44 lines
826 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2015, Michael Neuling, IBM Corp.
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*
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* Edited: Rashmica Gupta, Nov 2015
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*
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* This test does a fork syscall inside a transaction. Basic sniff test
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* to see if we can enter the kernel during a transaction.
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*/
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#include <errno.h>
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#include <inttypes.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 <unistd.h>
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#include "utils.h"
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#include "tm.h"
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int test_fork(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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"li 0, 2;" /* fork syscall */
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"sc ;"
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"tend.;"
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"1: ;"
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: : : "memory", "r0");
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/* If we reach here, we've passed. Otherwise we've probably crashed
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* the kernel */
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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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return test_harness(test_fork, "tm_fork");
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}
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