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selftests/rseq: Introduce thread pointer getters

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commit 886ddfba93 upstream.

This is done in preparation for the selftest uplift to become compatible
with glibc-2.35.

glibc-2.35 exposes the rseq per-thread data in the TCB, accessible
at an offset from the thread pointer.

The toolchains do not implement accessing the thread pointer on all
architectures. Provide thread pointer getters for ppc and x86 which
lack (or lacked until recently) toolchain support.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220124171253.22072-7-mathieu.desnoyers@efficios.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Desnoyers
2022-01-24 12:12:44 -05:00
committed by Greg Kroah-Hartman
parent 4a78bf83e2
commit c79e564535
4 changed files with 114 additions and 0 deletions
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25
tools/testing/selftests/rseq/rseq-generic-thread-pointer.h Normal file
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@@ -0,0 +1,25 @@
/* SPDX-License-Identifier: LGPL-2.1-only OR MIT */
/*
* rseq-generic-thread-pointer.h
*
* (C) Copyright 2021 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
#ifndef _RSEQ_GENERIC_THREAD_POINTER
#define _RSEQ_GENERIC_THREAD_POINTER
#ifdef __cplusplus
extern "C" {
#endif
/* Use gcc builtin thread pointer. */
static inline void *rseq_thread_pointer(void)
{
return __builtin_thread_pointer();
}
#ifdef __cplusplus
}
#endif
#endif

30
tools/testing/selftests/rseq/rseq-ppc-thread-pointer.h Normal file
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@@ -0,0 +1,30 @@
/* SPDX-License-Identifier: LGPL-2.1-only OR MIT */
/*
* rseq-ppc-thread-pointer.h
*
* (C) Copyright 2021 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
#ifndef _RSEQ_PPC_THREAD_POINTER
#define _RSEQ_PPC_THREAD_POINTER
#ifdef __cplusplus
extern "C" {
#endif
static inline void *rseq_thread_pointer(void)
{
#ifdef __powerpc64__
register void *__result asm ("r13");
#else
register void *__result asm ("r2");
#endif
asm ("" : "=r" (__result));
return __result;
}
#ifdef __cplusplus
}
#endif
#endif

19
tools/testing/selftests/rseq/rseq-thread-pointer.h Normal file
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@@ -0,0 +1,19 @@
/* SPDX-License-Identifier: LGPL-2.1-only OR MIT */
/*
* rseq-thread-pointer.h
*
* (C) Copyright 2021 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
#ifndef _RSEQ_THREAD_POINTER
#define _RSEQ_THREAD_POINTER
#if defined(__x86_64__) || defined(__i386__)
#include "rseq-x86-thread-pointer.h"
#elif defined(__PPC__)
#include "rseq-ppc-thread-pointer.h"
#else
#include "rseq-generic-thread-pointer.h"
#endif
#endif

40
tools/testing/selftests/rseq/rseq-x86-thread-pointer.h Normal file
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@@ -0,0 +1,40 @@
/* SPDX-License-Identifier: LGPL-2.1-only OR MIT */
/*
* rseq-x86-thread-pointer.h
*
* (C) Copyright 2021 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
#ifndef _RSEQ_X86_THREAD_POINTER
#define _RSEQ_X86_THREAD_POINTER
#include <features.h>
#ifdef __cplusplus
extern "C" {
#endif
#if __GNUC_PREREQ (11, 1)
static inline void *rseq_thread_pointer(void)
{
return __builtin_thread_pointer();
}
#else
static inline void *rseq_thread_pointer(void)
{
void *__result;
# ifdef __x86_64__
__asm__ ("mov %%fs:0, %0" : "=r" (__result));
# else
__asm__ ("mov %%gs:0, %0" : "=r" (__result));
# endif
return __result;
}
#endif /* !GCC 11 */
#ifdef __cplusplus
}
#endif
#endif