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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.
54 lines
1.0 KiB
C
54 lines
1.0 KiB
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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register int old, tmp;
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__asm__ __volatile__ (
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" addi %0, r0, 0\n"
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"1: lwx %0, %2, r0\n"
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" rsubk %1, %0, %3\n"
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" bnei %1, 1f\n"
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" swx %4, %2, r0\n"
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" addic %1, r0, 0\n"
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" bnei %1, 1b\n"
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"1: "
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: "=&r"(old), "=&r"(tmp)
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: "r"(p), "r"(t), "r"(s)
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: "cc", "memory" );
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return old;
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}
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#define a_swap a_swap
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static inline int a_swap(volatile int *x, int v)
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{
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register int old, tmp;
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__asm__ __volatile__ (
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" addi %0, r0, 0\n"
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"1: lwx %0, %2, r0\n"
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" swx %3, %2, r0\n"
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" addic %1, r0, 0\n"
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" bnei %1, 1b\n"
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"1: "
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: "=&r"(old), "=&r"(tmp)
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: "r"(x), "r"(v)
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: "cc", "memory" );
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return old;
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}
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#define a_fetch_add a_fetch_add
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static inline int a_fetch_add(volatile int *x, int v)
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{
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register int new, tmp;
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__asm__ __volatile__ (
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" addi %0, r0, 0\n"
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"1: lwx %0, %2, r0\n"
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" addk %0, %0, %3\n"
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" swx %0, %2, r0\n"
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" addic %1, r0, 0\n"
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" bnei %1, 1b\n"
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"1: "
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: "=&r"(new), "=&r"(tmp)
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: "r"(x), "r"(v)
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: "cc", "memory" );
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return new-v;
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}
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