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authorRich Felker <dalias@aerifal.cx>2016-01-22 00:10:40 +0000
committerRich Felker <dalias@aerifal.cx>2016-01-22 00:10:40 +0000
commit369b22f9c4aebba2b8fe905db8469b2667572ee1 (patch)
treecf3426f434e54ca53f5f124fbe9b950a45623913
parente617b9eea9d45b170eabadf5ca96ca0536c538be (diff)
downloadmusl-369b22f9c4aebba2b8fe905db8469b2667572ee1.tar.gz
overhaul mips atomics for new atomics framework
-rw-r--r--arch/mips/atomic_arch.h84
1 files changed, 31 insertions, 53 deletions
diff --git a/arch/mips/atomic_arch.h b/arch/mips/atomic_arch.h
index b111c894..ce2823b8 100644
--- a/arch/mips/atomic_arch.h
+++ b/arch/mips/atomic_arch.h
@@ -1,61 +1,39 @@
-#define a_cas a_cas
-static inline int a_cas(volatile int *p, int t, int s)
+#define a_ll a_ll
+static inline int a_ll(volatile int *p)
{
- int dummy;
- __asm__ __volatile__(
- ".set push\n"
- ".set mips2\n"
- ".set noreorder\n"
- " sync\n"
- "1: ll %0, %2\n"
- " bne %0, %3, 1f\n"
- " addu %1, %4, $0\n"
- " sc %1, %2\n"
- " beq %1, $0, 1b\n"
- " nop\n"
- " sync\n"
- "1: \n"
- ".set pop\n"
- : "=&r"(t), "=&r"(dummy), "+m"(*p) : "r"(t), "r"(s) : "memory" );
- return t;
+ int v;
+ __asm__ __volatile__ (
+ ".set push ; .set mips2\n\t"
+ "ll %0, %1"
+ "\n\t.set pop"
+ : "=r"(v) : "m"(*p));
+ return v;
}
-#define a_swap a_swap
-static inline int a_swap(volatile int *x, int v)
+#define a_sc a_sc
+static inline int a_sc(volatile int *p, int v)
{
- int old, dummy;
- __asm__ __volatile__(
- ".set push\n"
- ".set mips2\n"
- ".set noreorder\n"
- " sync\n"
- "1: ll %0, %2\n"
- " addu %1, %3, $0\n"
- " sc %1, %2\n"
- " beq %1, $0, 1b\n"
- " nop\n"
- " sync\n"
- ".set pop\n"
- : "=&r"(old), "=&r"(dummy), "+m"(*x) : "r"(v) : "memory" );
- return old;
+ int r;
+ __asm__ __volatile__ (
+ ".set push ; .set mips2\n\t"
+ "sc %0, %1"
+ "\n\t.set pop"
+ : "=r"(r), "=m"(*p) : "0"(v) : "memory");
+ return r;
}
-#define a_fetch_add a_fetch_add
-static inline int a_fetch_add(volatile int *x, int v)
+#define a_barrier a_barrier
+static inline void a_barrier()
{
- int old, dummy;
- __asm__ __volatile__(
- ".set push\n"
- ".set mips2\n"
- ".set noreorder\n"
- " sync\n"
- "1: ll %0, %2\n"
- " addu %1, %0, %3\n"
- " sc %1, %2\n"
- " beq %1, $0, 1b\n"
- " nop\n"
- " sync\n"
- ".set pop\n"
- : "=&r"(old), "=&r"(dummy), "+m"(*x) : "r"(v) : "memory" );
- return old;
+ /* mips2 sync, but using too many directives causes
+ * gcc not to inline it, so encode with .long instead. */
+ __asm__ __volatile__ (".long 0xf" : : : "memory");
+#if 0
+ __asm__ __volatile__ (
+ ".set push ; .set mips2 ; sync ; .set pop"
+ : : : "memory");
+#endif
}
+
+#define a_pre_llsc a_barrier
+#define a_post_llsc a_barrier