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$NetBSD: patch-src_dbinc_mutex_int.h,v 1.1 2019/02/19 15:18:19 hauke Exp $
* adds support for mutexes on aarch64
* fixes build failure on MIPS arch with -mips1.
--- src/dbinc/mutex_int.h.orig 2010-04-12 20:25:22.000000000 +0000
+++ src/dbinc/mutex_int.h
@@ -491,6 +491,43 @@ typedef unsigned char tsl_t;
#endif
/*********************************************************************
+ * AARCH64/gcc assembly.
+ *********************************************************************/
+
+#ifdef HAVE_MUTEX_AARCH64_GCC_ASSEMBLY
+typedef unsigned int tsl_t;
+
+#ifdef LOAD_ACTUAL_MUTEX_CODE
+static inline int
+MUTEX_SET(tsl_t *tsl) {
+ register tsl_t *__l = tsl;
+ register tsl_t __r;
+ __asm__ volatile(
+ "1: ldxr %w0,[%1]\n"
+ " cbnz %w0,2f\n"
+ " stxr %w0,%w2,[%1]\n"
+ " cbnz %w0,1b\n"
+ " dmb st\n"
+ "2:"
+ : "=&r"(__r)
+ : "r"(__l), "r"(1)
+ : "memory");
+
+ return !__r;
+}
+
+static inline int
+MUTEX_UNSET(tsl_t *tsl) {
+ __asm__ volatile(
+ " dsb sy\n" ::: "memory");
+ return *tsl = 0;
+}
+
+#define MUTEX_INIT(tsl) (MUTEX_UNSET(tsl), 0)
+#endif
+#endif
+
+/*********************************************************************
* HPPA/gcc assembly.
*********************************************************************/
#ifdef HAVE_MUTEX_HPPA_GCC_ASSEMBLY
@@ -778,10 +815,14 @@ MUTEX_SET(tsl_t *tsl) {
static inline void
MUTEX_UNSET(tsl_t *tsl) {
__asm__ volatile(
+ " .set push \n"
+ " .set mips2 \n"
" .set noreorder \n"
+ " .set nomacro \n"
" sync \n"
" sw $0, %0 \n"
" .set reorder \n"
+ " .set pop \n"
: "=m" (*tsl)
: "m" (*tsl)
: "memory");
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