Rich Felker
1315596b51
rather than having each arch provide its own atomic.h, there is a new shared atomic.h in src/internal which pulls arch-specific definitions from arc/$(ARCH)/atomic_arch.h. the latter can be extremely minimal, defining only a_cas or new ll/sc type primitives which the shared atomic.h will use to construct everything else. this commit avoids making heavy changes to the individual archs' atomic implementations. definitions which are identical or near-identical to what the new shared atomic.h would produce have been removed, but otherwise the changes made are just hooking up the arch-specific files to the new infrastructure. major changes to take advantage of the new system will come in subsequent commits.
16 lines
311 B
C
16 lines
311 B
C
#define a_cas a_cas
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static inline int a_cas(volatile int *p, int t, int s)
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{
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__asm__("\n"
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" sync\n"
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"1: lwarx %0, 0, %4\n"
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" cmpw %0, %2\n"
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" bne 1f\n"
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" stwcx. %3, 0, %4\n"
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" bne- 1b\n"
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" isync\n"
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"1: \n"
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: "=&r"(t), "+m"(*p) : "r"(t), "r"(s), "r"(p) : "cc", "memory" );
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return t;
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}
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