Add support for Motorola 88K to s_lock.h.

Apparently there are still people out there who care about this old
architecture.  They probably care about dusty versions of Postgres
too, so back-patch to all supported branches.

David Carlier (from a patch being carried by OpenBSD packagers)

Discussion: https://postgr.es/m/CA+XhMqzwFSGVU7MEnfhCecc8YdP98tigXzzpd0AAdwaGwaVXEA@mail.gmail.com

diff --git a/src/include/storage/s_lock.h b/src/include/storage/s_lock.h
index 46e76127218812d46babb1c62b58ce0f580d721e..88357e3ef1b4474573640ccc0db0aa4d01148f77 100644 (file)
--- a/src/include/storage/s_lock.h
+++ b/src/include/storage/s_lock.h
@@ -559,6 +559,30 @@ tas(volatile slock_t *lock)
 #endif  /* (__mc68000__ || __m68k__) && __linux__ */
 
 
+/* Motorola 88k */
+#if defined(__m88k__)
+#define HAS_TEST_AND_SET
+
+typedef unsigned int slock_t;
+
+#define TAS(lock) tas(lock)
+
+static __inline__ int
+tas(volatile slock_t *lock)
+{
+   register slock_t _res = 1;
+
+   __asm__ __volatile__(
+       "   xmem    %0, %2, %%r0    \n"
+:      "+r"(_res), "+m"(*lock)
+:      "r"(lock)
+:      "memory");
+   return (int) _res;
+}
+
+#endif  /* __m88k__ */
+
+
 /*
  * VAXen -- even multiprocessor ones
  * (thanks to Tom Ivar Helbekkmo)