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744f4be542
Implement support for both MIPS32 & MIPS64 in the rseq selftests, in order to sanity check the recently enabled rseq syscall. The tests all pass on a MIPS Boston development board running either a MIPS32r2 interAptiv CPU & a MIPS64r6 I6500 CPU, both of which were configured with 2 cores each of which have 2 hardware threads (VP(E)s) - ie. 4 CPUs. Signed-off-by: Paul Burton <paul.burton@mips.com> Reviewed-by: James Hogan <jhogan@kernel.org> Patchwork: https://patchwork.linux-mips.org/patch/19524/ Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org
150 lines
3.8 KiB
C
150 lines
3.8 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* rseq.h
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*
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* (C) Copyright 2016-2018 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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*/
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#ifndef RSEQ_H
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#define RSEQ_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <pthread.h>
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#include <signal.h>
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#include <sched.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sched.h>
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#include <linux/rseq.h>
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/*
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* Empty code injection macros, override when testing.
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* It is important to consider that the ASM injection macros need to be
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* fully reentrant (e.g. do not modify the stack).
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*/
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#ifndef RSEQ_INJECT_ASM
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#define RSEQ_INJECT_ASM(n)
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#endif
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#ifndef RSEQ_INJECT_C
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#define RSEQ_INJECT_C(n)
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#endif
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#ifndef RSEQ_INJECT_INPUT
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#define RSEQ_INJECT_INPUT
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#endif
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#ifndef RSEQ_INJECT_CLOBBER
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#define RSEQ_INJECT_CLOBBER
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#endif
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#ifndef RSEQ_INJECT_FAILED
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#define RSEQ_INJECT_FAILED
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#endif
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extern __thread volatile struct rseq __rseq_abi;
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#define rseq_likely(x) __builtin_expect(!!(x), 1)
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#define rseq_unlikely(x) __builtin_expect(!!(x), 0)
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#define rseq_barrier() __asm__ __volatile__("" : : : "memory")
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#define RSEQ_ACCESS_ONCE(x) (*(__volatile__ __typeof__(x) *)&(x))
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#define RSEQ_WRITE_ONCE(x, v) __extension__ ({ RSEQ_ACCESS_ONCE(x) = (v); })
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#define RSEQ_READ_ONCE(x) RSEQ_ACCESS_ONCE(x)
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#define __rseq_str_1(x) #x
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#define __rseq_str(x) __rseq_str_1(x)
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#define rseq_log(fmt, args...) \
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fprintf(stderr, fmt "(in %s() at " __FILE__ ":" __rseq_str(__LINE__)"\n", \
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## args, __func__)
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#define rseq_bug(fmt, args...) \
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do { \
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rseq_log(fmt, ##args); \
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abort(); \
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} while (0)
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#if defined(__x86_64__) || defined(__i386__)
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#include <rseq-x86.h>
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#elif defined(__ARMEL__)
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#include <rseq-arm.h>
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#elif defined(__PPC__)
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#include <rseq-ppc.h>
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#elif defined(__mips__)
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#include <rseq-mips.h>
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#else
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#error unsupported target
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#endif
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/*
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* Register rseq for the current thread. This needs to be called once
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* by any thread which uses restartable sequences, before they start
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* using restartable sequences, to ensure restartable sequences
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* succeed. A restartable sequence executed from a non-registered
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* thread will always fail.
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*/
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int rseq_register_current_thread(void);
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/*
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* Unregister rseq for current thread.
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*/
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int rseq_unregister_current_thread(void);
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/*
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* Restartable sequence fallback for reading the current CPU number.
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*/
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int32_t rseq_fallback_current_cpu(void);
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/*
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* Values returned can be either the current CPU number, -1 (rseq is
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* uninitialized), or -2 (rseq initialization has failed).
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*/
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static inline int32_t rseq_current_cpu_raw(void)
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{
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return RSEQ_ACCESS_ONCE(__rseq_abi.cpu_id);
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}
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/*
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* Returns a possible CPU number, which is typically the current CPU.
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* The returned CPU number can be used to prepare for an rseq critical
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* section, which will confirm whether the cpu number is indeed the
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* current one, and whether rseq is initialized.
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*
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* The CPU number returned by rseq_cpu_start should always be validated
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* by passing it to a rseq asm sequence, or by comparing it to the
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* return value of rseq_current_cpu_raw() if the rseq asm sequence
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* does not need to be invoked.
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*/
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static inline uint32_t rseq_cpu_start(void)
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{
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return RSEQ_ACCESS_ONCE(__rseq_abi.cpu_id_start);
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}
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static inline uint32_t rseq_current_cpu(void)
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{
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int32_t cpu;
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cpu = rseq_current_cpu_raw();
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if (rseq_unlikely(cpu < 0))
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cpu = rseq_fallback_current_cpu();
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return cpu;
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}
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/*
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* rseq_prepare_unload() should be invoked by each thread using rseq_finish*()
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* at least once between their last rseq_finish*() and library unload of the
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* library defining the rseq critical section (struct rseq_cs). This also
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* applies to use of rseq in code generated by JIT: rseq_prepare_unload()
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* should be invoked at least once by each thread using rseq_finish*() before
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* reclaim of the memory holding the struct rseq_cs.
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*/
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static inline void rseq_prepare_unload(void)
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{
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__rseq_abi.rseq_cs = 0;
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}
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#endif /* RSEQ_H_ */
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