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Edit File : rseq.h \| Size : 4.79 KB
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note / #ifndef _LINUX_RSEQ_H #define _LINUX_RSEQ_H / * linux/rseq.h * * Restartable sequences system call API * * Copyright (c) 2015-2018 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> / #include <linux/types.h> #include <asm/byteorder.h> enum rseq_cpu_id_state { RSEQ_CPU_ID_UNINITIALIZED = -1, RSEQ_CPU_ID_REGISTRATION_FAILED = -2, }; enum rseq_flags { RSEQ_FLAG_UNREGISTER = (1 << 0), }; enum rseq_cs_flags_bit { RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT = 0, RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT = 1, RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT = 2, }; enum rseq_cs_flags { RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT = (1U << RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT), RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL = (1U << RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT), RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE = (1U << RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT), }; / * struct rseq_cs is aligned on 4 * 8 bytes to ensure it is always * contained within a single cache-line. It is usually declared as * link-time constant data. / struct rseq_cs { / Version of this structure. / __u32 version; / enum rseq_cs_flags / __u32 flags; __u64 start_ip; / Offset from start_ip. / __u64 post_commit_offset; __u64 abort_ip; } __attribute__((aligned(4 sizeof(__u64)))); /* * struct rseq is aligned on 4 * 8 bytes to ensure it is always * contained within a single cache-line. * * A single struct rseq per thread is allowed. / struct rseq { / * Restartable sequences cpu_id_start field. Updated by the * kernel. Read by user-space with single-copy atomicity * semantics. This field should only be read by the thread which * registered this data structure. Aligned on 32-bit. Always * contains a value in the range of possible CPUs, although the * value may not be the actual current CPU (e.g. if rseq is not * initialized). This CPU number value should always be compared * against the value of the cpu_id field before performing a rseq * commit or returning a value read from a data structure indexed * using the cpu_id_start value. / __u32 cpu_id_start; / * Restartable sequences cpu_id field. Updated by the kernel. * Read by user-space with single-copy atomicity semantics. This * field should only be read by the thread which registered this * data structure. Aligned on 32-bit. Values * RSEQ_CPU_ID_UNINITIALIZED and RSEQ_CPU_ID_REGISTRATION_FAILED * have a special semantic: the former means "rseq uninitialized", * and latter means "rseq initialization failed". This value is * meant to be read within rseq critical sections and compared * with the cpu_id_start value previously read, before performing * the commit instruction, or read and compared with the * cpu_id_start value before returning a value loaded from a data * structure indexed using the cpu_id_start value. / __u32 cpu_id; / * Restartable sequences rseq_cs field. * * Contains NULL when no critical section is active for the current * thread, or holds a pointer to the currently active struct rseq_cs. * * Updated by user-space, which sets the address of the currently * active rseq_cs at the beginning of assembly instruction sequence * block, and set to NULL by the kernel when it restarts an assembly * instruction sequence block, as well as when the kernel detects that * it is preempting or delivering a signal outside of the range * targeted by the rseq_cs. Also needs to be set to NULL by user-space * before reclaiming memory that contains the targeted struct rseq_cs. * * Read and set by the kernel. Set by user-space with single-copy * atomicity semantics. This field should only be updated by the * thread which registered this data structure. Aligned on 64-bit. / union { __u64 ptr64; #ifdef __LP64__ __u64 ptr; #else struct { #if (defined(__BYTE_ORDER) && (__BYTE_ORDER == __BIG_ENDIAN)) \|\| defined(__BIG_ENDIAN) __u32 padding; / Initialized to zero. / __u32 ptr32; #else / LITTLE / __u32 ptr32; __u32 padding; / Initialized to zero. / #endif / ENDIAN / } ptr; #endif } rseq_cs; / * Restartable sequences flags field. * * This field should only be updated by the thread which * registered this data structure. Read by the kernel. * Mainly used for single-stepping through rseq critical sections * with debuggers. * * - RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT * Inhibit instruction sequence block restart on preemption * for this thread. * - RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL * Inhibit instruction sequence block restart on signal * delivery for this thread. * - RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE * Inhibit instruction sequence block restart on migration for * this thread. / __u32 flags; } __attribute__((aligned(4 sizeof(__u64)))); #endif /* _LINUX_RSEQ_H */ Back

Edit File : rseq.h | Size : 4.79 KB

/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
#ifndef _LINUX_RSEQ_H
#define _LINUX_RSEQ_H

/*
 * linux/rseq.h
 *
 * Restartable sequences system call API
 *
 * Copyright (c) 2015-2018 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#include <linux/types.h>
#include <asm/byteorder.h>

enum rseq_cpu_id_state {
	RSEQ_CPU_ID_UNINITIALIZED		= -1,
	RSEQ_CPU_ID_REGISTRATION_FAILED		= -2,
};

enum rseq_flags {
	RSEQ_FLAG_UNREGISTER = (1 << 0),
};

enum rseq_cs_flags_bit {
	RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT	= 0,
	RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT	= 1,
	RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT	= 2,
};

enum rseq_cs_flags {
	RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT	=
		(1U << RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT),
	RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL	=
		(1U << RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT),
	RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE	=
		(1U << RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT),
};

/*
 * struct rseq_cs is aligned on 4 * 8 bytes to ensure it is always
 * contained within a single cache-line. It is usually declared as
 * link-time constant data.
 */
struct rseq_cs {
	/* Version of this structure. */
	__u32 version;
	/* enum rseq_cs_flags */
	__u32 flags;
	__u64 start_ip;
	/* Offset from start_ip. */
	__u64 post_commit_offset;
	__u64 abort_ip;
} __attribute__((aligned(4 * sizeof(__u64))));

/*
 * struct rseq is aligned on 4 * 8 bytes to ensure it is always
 * contained within a single cache-line.
 *
 * A single struct rseq per thread is allowed.
 */
struct rseq {
	/*
	 * Restartable sequences cpu_id_start field. Updated by the
	 * kernel. Read by user-space with single-copy atomicity
	 * semantics. This field should only be read by the thread which
	 * registered this data structure. Aligned on 32-bit. Always
	 * contains a value in the range of possible CPUs, although the
	 * value may not be the actual current CPU (e.g. if rseq is not
	 * initialized). This CPU number value should always be compared
	 * against the value of the cpu_id field before performing a rseq
	 * commit or returning a value read from a data structure indexed
	 * using the cpu_id_start value.
	 */
	__u32 cpu_id_start;
	/*
	 * Restartable sequences cpu_id field. Updated by the kernel.
	 * Read by user-space with single-copy atomicity semantics. This
	 * field should only be read by the thread which registered this
	 * data structure. Aligned on 32-bit. Values
	 * RSEQ_CPU_ID_UNINITIALIZED and RSEQ_CPU_ID_REGISTRATION_FAILED
	 * have a special semantic: the former means "rseq uninitialized",
	 * and latter means "rseq initialization failed". This value is
	 * meant to be read within rseq critical sections and compared
	 * with the cpu_id_start value previously read, before performing
	 * the commit instruction, or read and compared with the
	 * cpu_id_start value before returning a value loaded from a data
	 * structure indexed using the cpu_id_start value.
	 */
	__u32 cpu_id;
	/*
	 * Restartable sequences rseq_cs field.
	 *
	 * Contains NULL when no critical section is active for the current
	 * thread, or holds a pointer to the currently active struct rseq_cs.
	 *
	 * Updated by user-space, which sets the address of the currently
	 * active rseq_cs at the beginning of assembly instruction sequence
	 * block, and set to NULL by the kernel when it restarts an assembly
	 * instruction sequence block, as well as when the kernel detects that
	 * it is preempting or delivering a signal outside of the range
	 * targeted by the rseq_cs. Also needs to be set to NULL by user-space
	 * before reclaiming memory that contains the targeted struct rseq_cs.
	 *
	 * Read and set by the kernel. Set by user-space with single-copy
	 * atomicity semantics. This field should only be updated by the
	 * thread which registered this data structure. Aligned on 64-bit.
	 */
	union {
		__u64 ptr64;
#ifdef __LP64__
		__u64 ptr;
#else
		struct {
#if (defined(__BYTE_ORDER) && (__BYTE_ORDER == __BIG_ENDIAN)) || defined(__BIG_ENDIAN)
			__u32 padding;		/* Initialized to zero. */
			__u32 ptr32;
#else /* LITTLE */
			__u32 ptr32;
			__u32 padding;		/* Initialized to zero. */
#endif /* ENDIAN */
		} ptr;
#endif
	} rseq_cs;

/*
	 * Restartable sequences flags field.
	 *
	 * This field should only be updated by the thread which
	 * registered this data structure. Read by the kernel.
	 * Mainly used for single-stepping through rseq critical sections
	 * with debuggers.
	 *
	 * - RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT
	 *     Inhibit instruction sequence block restart on preemption
	 *     for this thread.
	 * - RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL
	 *     Inhibit instruction sequence block restart on signal
	 *     delivery for this thread.
	 * - RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE
	 *     Inhibit instruction sequence block restart on migration for
	 *     this thread.
	 */
	__u32 flags;
} __attribute__((aligned(4 * sizeof(__u64))));

#endif /* _LINUX_RSEQ_H */

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