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Linux/tools/testing/selftests/rseq/rseq.h

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  1 /* SPDX-License-Identifier: LGPL-2.1 OR MIT */
  2 /*
  3  * rseq.h
  4  *
  5  * (C) Copyright 2016-2018 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  6  */
  7 
  8 #ifndef RSEQ_H
  9 #define RSEQ_H
 10 
 11 #include <stdint.h>
 12 #include <stdbool.h>
 13 #include <pthread.h>
 14 #include <signal.h>
 15 #include <sched.h>
 16 #include <errno.h>
 17 #include <stdio.h>
 18 #include <stdlib.h>
 19 #include <linux/rseq.h>
 20 
 21 /*
 22  * Empty code injection macros, override when testing.
 23  * It is important to consider that the ASM injection macros need to be
 24  * fully reentrant (e.g. do not modify the stack).
 25  */
 26 #ifndef RSEQ_INJECT_ASM
 27 #define RSEQ_INJECT_ASM(n)
 28 #endif
 29 
 30 #ifndef RSEQ_INJECT_C
 31 #define RSEQ_INJECT_C(n)
 32 #endif
 33 
 34 #ifndef RSEQ_INJECT_INPUT
 35 #define RSEQ_INJECT_INPUT
 36 #endif
 37 
 38 #ifndef RSEQ_INJECT_CLOBBER
 39 #define RSEQ_INJECT_CLOBBER
 40 #endif
 41 
 42 #ifndef RSEQ_INJECT_FAILED
 43 #define RSEQ_INJECT_FAILED
 44 #endif
 45 
 46 extern __thread volatile struct rseq __rseq_abi;
 47 extern int __rseq_handled;
 48 
 49 #define rseq_likely(x)          __builtin_expect(!!(x), 1)
 50 #define rseq_unlikely(x)        __builtin_expect(!!(x), 0)
 51 #define rseq_barrier()          __asm__ __volatile__("" : : : "memory")
 52 
 53 #define RSEQ_ACCESS_ONCE(x)     (*(__volatile__  __typeof__(x) *)&(x))
 54 #define RSEQ_WRITE_ONCE(x, v)   __extension__ ({ RSEQ_ACCESS_ONCE(x) = (v); })
 55 #define RSEQ_READ_ONCE(x)       RSEQ_ACCESS_ONCE(x)
 56 
 57 #define __rseq_str_1(x) #x
 58 #define __rseq_str(x)           __rseq_str_1(x)
 59 
 60 #define rseq_log(fmt, args...)                                                 \
 61         fprintf(stderr, fmt "(in %s() at " __FILE__ ":" __rseq_str(__LINE__)"\n", \
 62                 ## args, __func__)
 63 
 64 #define rseq_bug(fmt, args...)          \
 65         do {                            \
 66                 rseq_log(fmt, ##args);  \
 67                 abort();                \
 68         } while (0)
 69 
 70 #if defined(__x86_64__) || defined(__i386__)
 71 #include <rseq-x86.h>
 72 #elif defined(__ARMEL__)
 73 #include <rseq-arm.h>
 74 #elif defined (__AARCH64EL__)
 75 #include <rseq-arm64.h>
 76 #elif defined(__PPC__)
 77 #include <rseq-ppc.h>
 78 #elif defined(__mips__)
 79 #include <rseq-mips.h>
 80 #elif defined(__s390__)
 81 #include <rseq-s390.h>
 82 #else
 83 #error unsupported target
 84 #endif
 85 
 86 /*
 87  * Register rseq for the current thread. This needs to be called once
 88  * by any thread which uses restartable sequences, before they start
 89  * using restartable sequences, to ensure restartable sequences
 90  * succeed. A restartable sequence executed from a non-registered
 91  * thread will always fail.
 92  */
 93 int rseq_register_current_thread(void);
 94 
 95 /*
 96  * Unregister rseq for current thread.
 97  */
 98 int rseq_unregister_current_thread(void);
 99 
100 /*
101  * Restartable sequence fallback for reading the current CPU number.
102  */
103 int32_t rseq_fallback_current_cpu(void);
104 
105 /*
106  * Values returned can be either the current CPU number, -1 (rseq is
107  * uninitialized), or -2 (rseq initialization has failed).
108  */
109 static inline int32_t rseq_current_cpu_raw(void)
110 {
111         return RSEQ_ACCESS_ONCE(__rseq_abi.cpu_id);
112 }
113 
114 /*
115  * Returns a possible CPU number, which is typically the current CPU.
116  * The returned CPU number can be used to prepare for an rseq critical
117  * section, which will confirm whether the cpu number is indeed the
118  * current one, and whether rseq is initialized.
119  *
120  * The CPU number returned by rseq_cpu_start should always be validated
121  * by passing it to a rseq asm sequence, or by comparing it to the
122  * return value of rseq_current_cpu_raw() if the rseq asm sequence
123  * does not need to be invoked.
124  */
125 static inline uint32_t rseq_cpu_start(void)
126 {
127         return RSEQ_ACCESS_ONCE(__rseq_abi.cpu_id_start);
128 }
129 
130 static inline uint32_t rseq_current_cpu(void)
131 {
132         int32_t cpu;
133 
134         cpu = rseq_current_cpu_raw();
135         if (rseq_unlikely(cpu < 0))
136                 cpu = rseq_fallback_current_cpu();
137         return cpu;
138 }
139 
140 static inline void rseq_clear_rseq_cs(void)
141 {
142 #ifdef __LP64__
143         __rseq_abi.rseq_cs.ptr = 0;
144 #else
145         __rseq_abi.rseq_cs.ptr.ptr32 = 0;
146 #endif
147 }
148 
149 /*
150  * rseq_prepare_unload() should be invoked by each thread executing a rseq
151  * critical section at least once between their last critical section and
152  * library unload of the library defining the rseq critical section
153  * (struct rseq_cs). This also applies to use of rseq in code generated by
154  * JIT: rseq_prepare_unload() should be invoked at least once by each
155  * thread executing a rseq critical section before reclaim of the memory
156  * holding the struct rseq_cs.
157  */
158 static inline void rseq_prepare_unload(void)
159 {
160         rseq_clear_rseq_cs();
161 }
162 
163 #endif  /* RSEQ_H_ */
164 

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