From 1315596b510189b5159e742110b504177bdd4932 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Thu, 21 Jan 2016 19:08:54 +0000 Subject: refactor internal atomic.h 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. --- arch/powerpc/atomic_arch.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 arch/powerpc/atomic_arch.h (limited to 'arch/powerpc/atomic_arch.h') diff --git a/arch/powerpc/atomic_arch.h b/arch/powerpc/atomic_arch.h new file mode 100644 index 00000000..f014e3b8 --- /dev/null +++ b/arch/powerpc/atomic_arch.h @@ -0,0 +1,15 @@ +#define a_cas a_cas +static inline int a_cas(volatile int *p, int t, int s) +{ + __asm__("\n" + " sync\n" + "1: lwarx %0, 0, %4\n" + " cmpw %0, %2\n" + " bne 1f\n" + " stwcx. %3, 0, %4\n" + " bne- 1b\n" + " isync\n" + "1: \n" + : "=&r"(t), "+m"(*p) : "r"(t), "r"(s), "r"(p) : "cc", "memory" ); + return t; +} -- cgit v1.2.1