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authorSverker Eriksson <[email protected]>2016-02-24 17:55:04 +0100
committerSverker Eriksson <[email protected]>2016-02-24 17:55:04 +0100
commit03743cd4193a2ca97f9b9a52a25e63f616e8fc07 (patch)
tree9c1f4094a2105ec4bf19dd0d16e76b598d0e608d /erts/include/internal/i386/ethr_dw_atomic.h
parent1b094d72ffc56069c72f17c7edd673dbbfe47e39 (diff)
parent35739bd06776f90526006486b3f4ab7e54f7f951 (diff)
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Merge branch 'master' into sverk/master/halt-INT_MIN
Diffstat (limited to 'erts/include/internal/i386/ethr_dw_atomic.h')
-rw-r--r--erts/include/internal/i386/ethr_dw_atomic.h73
1 files changed, 48 insertions, 25 deletions
diff --git a/erts/include/internal/i386/ethr_dw_atomic.h b/erts/include/internal/i386/ethr_dw_atomic.h
index e8c4119ef0..5444a6345c 100644
--- a/erts/include/internal/i386/ethr_dw_atomic.h
+++ b/erts/include/internal/i386/ethr_dw_atomic.h
@@ -115,13 +115,19 @@ ethr_native_dw_atomic_addr(ethr_native_dw_atomic_t *var)
return (ethr_sint_t *) ETHR_DW_NATMC_MEM__(var);
}
-#if ETHR_SIZEOF_PTR == 4 && defined(__PIC__) && __PIC__
+#if defined(ETHR_CMPXCHG8B_PIC_NO_CLOBBER_EBX) && defined(__PIC__) && __PIC__
+#if ETHR_SIZEOF_PTR != 4
+# error unexpected pic issue
+#endif
/*
* When position independent code is used in 32-bit mode, the EBX register
- * is used for storage of global offset table address, and we may not
- * use it as input or output in an asm. We need to save and restore the
- * EBX register explicitly (for some reason gcc doesn't provide this
- * service to us).
+ * is used for storage of global offset table address. When compiling with
+ * an old gcc (< vsn 5) we may not use it as input or output in an inline
+ * asm. We then need to save and restore the EBX register explicitly (for
+ * some reason old gcc compilers didn't provide this service to us).
+ * ETHR_CMPXCHG8B_PIC_NO_CLOBBER_EBX will be defined if we need to
+ * explicitly manage EBX ourselves.
+ *
*/
# define ETHR_NO_CLOBBER_EBX__ 1
#else
@@ -151,36 +157,53 @@ ethr_native_dw_atomic_cmpxchg_mb(ethr_native_dw_atomic_t *var,
ETHR_DW_DBG_ALIGNED__(p);
+#if ETHR_NO_CLOBBER_EBX__ && ETHR_CMPXCHG8B_REGISTER_SHORTAGE
+ /*
+ * gcc wont let us use ebx as input and we
+ * get a register shortage
+ */
+
__asm__ __volatile__(
-#if ETHR_NO_CLOBBER_EBX__
"pushl %%ebx\n\t"
-# if ETHR_CMPXCHG8B_REGISTER_SHORTAGE
"movl (%7), %%ebx\n\t"
"movl 4(%7), %%ecx\n\t"
-# else
- "movl %8, %%ebx\n\t"
-# endif
-#endif
- "lock; cmpxchg" ETHR_DW_CMPXCHG_SFX__ " %0\n\t"
+ "lock; cmpxchg8b %0\n\t"
"setz %3\n\t"
-#if ETHR_NO_CLOBBER_EBX__
"popl %%ebx\n\t"
-#endif
: "=m"(*p), "=d"(xchg[1]), "=a"(xchg[0]), "=c"(xchgd)
- : "m"(*p), "1"(xchg[1]), "2"(xchg[0]),
-#if ETHR_NO_CLOBBER_EBX__
-# if ETHR_CMPXCHG8B_REGISTER_SHORTAGE
- "3"(new)
-# else
- "3"(new[1]),
- "r"(new[0])
-# endif
+ : "m"(*p), "1"(xchg[1]), "2"(xchg[0]), "r"(new)
+ : "cc", "memory");
+
+#elif ETHR_NO_CLOBBER_EBX__
+ /*
+ * gcc wont let us use ebx as input
+ */
+
+ __asm__ __volatile__(
+ "pushl %%ebx\n\t"
+ "movl %8, %%ebx\n\t"
+ "lock; cmpxchg8b %0\n\t"
+ "setz %3\n\t"
+ "popl %%ebx\n\t"
+ : "=m"(*p), "=d"(xchg[1]), "=a"(xchg[0]), "=q"(xchgd)
+ : "m"(*p), "1"(xchg[1]), "2"(xchg[0]), "c"(new[1]), "r"(new[0])
+ : "cc", "memory");
+
#else
- "3"(new[1]),
- "b"(new[0])
-#endif
+ /*
+ * gcc lets us place values in the registers where
+ * we want them
+ */
+
+ __asm__ __volatile__(
+ "lock; cmpxchg" ETHR_DW_CMPXCHG_SFX__ " %0\n\t"
+ "setz %3\n\t"
+ : "=m"(*p), "=d"(xchg[1]), "=a"(xchg[0]), "=q"(xchgd)
+ : "m"(*p), "1"(xchg[1]), "2"(xchg[0]), "c"(new[1]), "b"(new[0])
: "cc", "memory");
+#endif
+
return (int) xchgd;
}