71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_COMPILER_H
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#define _ASM_COMPILER_H
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#include <asm/glob_regs.h>
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#undef barrier
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#undef barrier_data
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#undef RELOC_HIDE
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#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) && !defined(__CHECKER__)
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#if GCC_VERSION >= 40400
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/* builtin version has better throughput but worse latency */
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#undef __HAVE_BUILTIN_BSWAP32__
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#endif
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#endif
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#define __PREEMPTION_CLOBBERS_1(cpu_greg, offset_greg) \
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"g" #cpu_greg, "g" #offset_greg
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#define __PREEMPTION_CLOBBERS(cpu_greg, offset_greg) \
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__PREEMPTION_CLOBBERS_1(cpu_greg, offset_greg)
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/* If a compiler barrier is used in loop, these clobbers will
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* force the compiler to always access *current* per-cpu area
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* instead of moving its address calculation out from the loop.
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*
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* The same goes for preemption-disabled sections: these clobbers
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* will forbid compiler to move per-cpu area address calculation out
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* from them. Since disabling interrupts also disables preemption,
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* we also need these clobbers when writing PSR/UPSR. */
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#define PREEMPTION_CLOBBERS __PREEMPTION_CLOBBERS(SMP_CPU_ID_GREG, MY_CPU_OFFSET_GREG)
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#ifdef CONFIG_DEBUG_LCC_VOLATILE_ATOMIC
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#define NOT_VOLATILE volatile
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#else
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#define NOT_VOLATILE
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#endif
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/* See bug #89623, bug #94946 */
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#define barrier() \
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do { \
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int unused; \
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__asm__ NOT_VOLATILE("" : "=r" (unused) : : "memory", PREEMPTION_CLOBBERS);\
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} while (0)
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/* See comment before PREEMPTION_CLOBBERS */
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#define barrier_preemption() \
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do { \
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int unused; \
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__asm__ NOT_VOLATILE("" : "=r" (unused) : : PREEMPTION_CLOBBERS);\
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} while (0)
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#define barrier_data(ptr) \
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do { \
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__asm__ NOT_VOLATILE("" : : "r"(ptr) : "memory", PREEMPTION_CLOBBERS); \
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} while (0)
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#define RELOC_HIDE(ptr, off) \
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({ \
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unsigned long __ptr; \
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__asm__ ("" : "=r"(__ptr) : "0"(ptr)); \
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(typeof(ptr)) (__ptr + (off)); \
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})
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#if defined(__LCC__) && (__LCC__ > 125 || __LCC__ == 125 && __LCC_MINOR__ >= 9)
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# define builtin_expect_wrapper(x, val) __builtin_expect_with_probability((x), (val), 0.9999)
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#else
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# define builtin_expect_wrapper(x, val) __builtin_expect((x), (val))
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#endif
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#endif /* _ASM_COMPILER_H */
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