From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Tue, 15 Jun 2021 20:00:28 +0000 (-0400)
Subject: Fix: x86 and s390: uatomic __hp() macro clang support
X-Git-Tag: v0.13.1~8
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=575b4c6c906186fa101087d5e83477a3f13bc3fb;p=userspace-rcu.git

Fix: x86 and s390: uatomic __hp() macro clang support

The __hp macro should receive contant size arguments to support clang,
which does not implement VLA support.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ifa3d5b5b7921f54849e0f331bef8f07c059b998f
---

diff --git a/include/urcu/uatomic/s390.h b/include/urcu/uatomic/s390.h
index 47b97b1..d7d545a 100644
--- a/include/urcu/uatomic/s390.h
+++ b/include/urcu/uatomic/s390.h
@@ -62,10 +62,11 @@ extern "C" {
 #endif /* !COMPILER_HAVE_SHORT_MEM_OPERAND */
 
 /*
- * The __hp() macro casts the void pointer "x" to a pointer to a structure
+ * The __hp() macro casts the void pointer @x to a pointer to a structure
  * containing an array of char of the specified size. This allows passing the
  * @addr arguments of the following inline functions as "m" and "+m" operands
- * to the assembly.
+ * to the assembly. The @size parameter should be a constant to support
+ * compilers such as clang which do not support VLA.
  */
 
 #define __hp(size, x)	((struct { char v[size]; } *)(x))
@@ -83,8 +84,8 @@ unsigned long _uatomic_exchange(volatile void *addr, unsigned long val, int len)
 		__asm__ __volatile__(
 			"0:	cs %0,%2," MEMOP_REF(%3) "\n"
 			"	brc 4,0b\n"
-			: "=&r" (old_val), MEMOP_OUT (__hp(len, addr))
-			: "r" (val), MEMOP_IN (__hp(len, addr))
+			: "=&r" (old_val), MEMOP_OUT (__hp(4, addr))
+			: "r" (val), MEMOP_IN (__hp(4, addr))
 			: "memory", "cc");
 		return old_val;
 	}
@@ -96,8 +97,8 @@ unsigned long _uatomic_exchange(volatile void *addr, unsigned long val, int len)
 		__asm__ __volatile__(
 			"0:	csg %0,%2," MEMOP_REF(%3) "\n"
 			"	brc 4,0b\n"
-			: "=&r" (old_val), MEMOP_OUT (__hp(len, addr))
-			: "r" (val), MEMOP_IN (__hp(len, addr))
+			: "=&r" (old_val), MEMOP_OUT (__hp(8, addr))
+			: "r" (val), MEMOP_IN (__hp(8, addr))
 			: "memory", "cc");
 		return old_val;
 	}
@@ -127,8 +128,8 @@ unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
 
 		__asm__ __volatile__(
 			"	cs %0,%2," MEMOP_REF(%3) "\n"
-			: "+r" (old_val), MEMOP_OUT (__hp(len, addr))
-			: "r" (_new), MEMOP_IN (__hp(len, addr))
+			: "+r" (old_val), MEMOP_OUT (__hp(4, addr))
+			: "r" (_new), MEMOP_IN (__hp(4, addr))
 			: "memory", "cc");
 		return old_val;
 	}
@@ -137,8 +138,8 @@ unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
 	{
 		__asm__ __volatile__(
 			"	csg %0,%2," MEMOP_REF(%3) "\n"
-			: "+r" (old), MEMOP_OUT (__hp(len, addr))
-			: "r" (_new), MEMOP_IN (__hp(len, addr))
+			: "+r" (old), MEMOP_OUT (__hp(8, addr))
+			: "r" (_new), MEMOP_IN (__hp(8, addr))
 			: "memory", "cc");
 		return old;
 	}
diff --git a/include/urcu/uatomic/x86.h b/include/urcu/uatomic/x86.h
index e9f2f78..c02c96d 100644
--- a/include/urcu/uatomic/x86.h
+++ b/include/urcu/uatomic/x86.h
@@ -37,10 +37,11 @@ extern "C" {
  */
 
 /*
- * The __hp() macro casts the void pointer "x" to a pointer to a structure
+ * The __hp() macro casts the void pointer @x to a pointer to a structure
  * containing an array of char of the specified size. This allows passing the
  * @addr arguments of the following inline functions as "m" and "+m" operands
- * to the assembly.
+ * to the assembly. The @size parameter should be a constant to support
+ * compilers such as clang which do not support VLA.
  */
 
 #define __hp(size, x)	((struct { char v[size]; } *)(x))
@@ -60,7 +61,7 @@ unsigned long __uatomic_cmpxchg(void *addr, unsigned long old,
 
 		__asm__ __volatile__(
 		"lock; cmpxchgb %2, %1"
-			: "+a"(result), "+m"(*__hp(len, addr))
+			: "+a"(result), "+m"(*__hp(1, addr))
 			: "q"((unsigned char)_new)
 			: "memory");
 		return result;
@@ -71,7 +72,7 @@ unsigned long __uatomic_cmpxchg(void *addr, unsigned long old,
 
 		__asm__ __volatile__(
 		"lock; cmpxchgw %2, %1"
-			: "+a"(result), "+m"(*__hp(len, addr))
+			: "+a"(result), "+m"(*__hp(2, addr))
 			: "r"((unsigned short)_new)
 			: "memory");
 		return result;
@@ -82,7 +83,7 @@ unsigned long __uatomic_cmpxchg(void *addr, unsigned long old,
 
 		__asm__ __volatile__(
 		"lock; cmpxchgl %2, %1"
-			: "+a"(result), "+m"(*__hp(len, addr))
+			: "+a"(result), "+m"(*__hp(4, addr))
 			: "r"((unsigned int)_new)
 			: "memory");
 		return result;
@@ -94,7 +95,7 @@ unsigned long __uatomic_cmpxchg(void *addr, unsigned long old,
 
 		__asm__ __volatile__(
 		"lock; cmpxchgq %2, %1"
-			: "+a"(result), "+m"(*__hp(len, addr))
+			: "+a"(result), "+m"(*__hp(8, addr))
 			: "r"((unsigned long)_new)
 			: "memory");
 		return result;
@@ -127,7 +128,7 @@ unsigned long __uatomic_exchange(void *addr, unsigned long val, int len)
 		unsigned char result;
 		__asm__ __volatile__(
 		"xchgb %0, %1"
-			: "=q"(result), "+m"(*__hp(len, addr))
+			: "=q"(result), "+m"(*__hp(1, addr))
 			: "0" ((unsigned char)val)
 			: "memory");
 		return result;
@@ -137,7 +138,7 @@ unsigned long __uatomic_exchange(void *addr, unsigned long val, int len)
 		unsigned short result;
 		__asm__ __volatile__(
 		"xchgw %0, %1"
-			: "=r"(result), "+m"(*__hp(len, addr))
+			: "=r"(result), "+m"(*__hp(2, addr))
 			: "0" ((unsigned short)val)
 			: "memory");
 		return result;
@@ -147,7 +148,7 @@ unsigned long __uatomic_exchange(void *addr, unsigned long val, int len)
 		unsigned int result;
 		__asm__ __volatile__(
 		"xchgl %0, %1"
-			: "=r"(result), "+m"(*__hp(len, addr))
+			: "=r"(result), "+m"(*__hp(4, addr))
 			: "0" ((unsigned int)val)
 			: "memory");
 		return result;
@@ -158,7 +159,7 @@ unsigned long __uatomic_exchange(void *addr, unsigned long val, int len)
 		unsigned long result;
 		__asm__ __volatile__(
 		"xchgq %0, %1"
-			: "=r"(result), "+m"(*__hp(len, addr))
+			: "=r"(result), "+m"(*__hp(8, addr))
 			: "0" ((unsigned long)val)
 			: "memory");
 		return result;
@@ -191,7 +192,7 @@ unsigned long __uatomic_add_return(void *addr, unsigned long val,
 
 		__asm__ __volatile__(
 		"lock; xaddb %1, %0"
-			: "+m"(*__hp(len, addr)), "+q" (result)
+			: "+m"(*__hp(1, addr)), "+q" (result)
 			:
 			: "memory");
 		return result + (unsigned char)val;
@@ -202,7 +203,7 @@ unsigned long __uatomic_add_return(void *addr, unsigned long val,
 
 		__asm__ __volatile__(
 		"lock; xaddw %1, %0"
-			: "+m"(*__hp(len, addr)), "+r" (result)
+			: "+m"(*__hp(2, addr)), "+r" (result)
 			:
 			: "memory");
 		return result + (unsigned short)val;
@@ -213,7 +214,7 @@ unsigned long __uatomic_add_return(void *addr, unsigned long val,
 
 		__asm__ __volatile__(
 		"lock; xaddl %1, %0"
-			: "+m"(*__hp(len, addr)), "+r" (result)
+			: "+m"(*__hp(4, addr)), "+r" (result)
 			:
 			: "memory");
 		return result + (unsigned int)val;
@@ -225,7 +226,7 @@ unsigned long __uatomic_add_return(void *addr, unsigned long val,
 
 		__asm__ __volatile__(
 		"lock; xaddq %1, %0"
-			: "+m"(*__hp(len, addr)), "+r" (result)
+			: "+m"(*__hp(8, addr)), "+r" (result)
 			:
 			: "memory");
 		return result + (unsigned long)val;
@@ -255,7 +256,7 @@ void __uatomic_and(void *addr, unsigned long val, int len)
 	{
 		__asm__ __volatile__(
 		"lock; andb %1, %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(1, addr))
 			: "iq" ((unsigned char)val)
 			: "memory");
 		return;
@@ -264,7 +265,7 @@ void __uatomic_and(void *addr, unsigned long val, int len)
 	{
 		__asm__ __volatile__(
 		"lock; andw %1, %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(2, addr))
 			: "ir" ((unsigned short)val)
 			: "memory");
 		return;
@@ -273,7 +274,7 @@ void __uatomic_and(void *addr, unsigned long val, int len)
 	{
 		__asm__ __volatile__(
 		"lock; andl %1, %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(4, addr))
 			: "ir" ((unsigned int)val)
 			: "memory");
 		return;
@@ -283,7 +284,7 @@ void __uatomic_and(void *addr, unsigned long val, int len)
 	{
 		__asm__ __volatile__(
 		"lock; andq %1, %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(8, addr))
 			: "er" ((unsigned long)val)
 			: "memory");
 		return;
@@ -311,7 +312,7 @@ void __uatomic_or(void *addr, unsigned long val, int len)
 	{
 		__asm__ __volatile__(
 		"lock; orb %1, %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(1, addr))
 			: "iq" ((unsigned char)val)
 			: "memory");
 		return;
@@ -320,7 +321,7 @@ void __uatomic_or(void *addr, unsigned long val, int len)
 	{
 		__asm__ __volatile__(
 		"lock; orw %1, %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(2, addr))
 			: "ir" ((unsigned short)val)
 			: "memory");
 		return;
@@ -329,7 +330,7 @@ void __uatomic_or(void *addr, unsigned long val, int len)
 	{
 		__asm__ __volatile__(
 		"lock; orl %1, %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(4, addr))
 			: "ir" ((unsigned int)val)
 			: "memory");
 		return;
@@ -339,7 +340,7 @@ void __uatomic_or(void *addr, unsigned long val, int len)
 	{
 		__asm__ __volatile__(
 		"lock; orq %1, %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(8, addr))
 			: "er" ((unsigned long)val)
 			: "memory");
 		return;
@@ -367,7 +368,7 @@ void __uatomic_add(void *addr, unsigned long val, int len)
 	{
 		__asm__ __volatile__(
 		"lock; addb %1, %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(1, addr))
 			: "iq" ((unsigned char)val)
 			: "memory");
 		return;
@@ -376,7 +377,7 @@ void __uatomic_add(void *addr, unsigned long val, int len)
 	{
 		__asm__ __volatile__(
 		"lock; addw %1, %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(2, addr))
 			: "ir" ((unsigned short)val)
 			: "memory");
 		return;
@@ -385,7 +386,7 @@ void __uatomic_add(void *addr, unsigned long val, int len)
 	{
 		__asm__ __volatile__(
 		"lock; addl %1, %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(4, addr))
 			: "ir" ((unsigned int)val)
 			: "memory");
 		return;
@@ -395,7 +396,7 @@ void __uatomic_add(void *addr, unsigned long val, int len)
 	{
 		__asm__ __volatile__(
 		"lock; addq %1, %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(8, addr))
 			: "er" ((unsigned long)val)
 			: "memory");
 		return;
@@ -424,7 +425,7 @@ void __uatomic_inc(void *addr, int len)
 	{
 		__asm__ __volatile__(
 		"lock; incb %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(1, addr))
 			:
 			: "memory");
 		return;
@@ -433,7 +434,7 @@ void __uatomic_inc(void *addr, int len)
 	{
 		__asm__ __volatile__(
 		"lock; incw %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(2, addr))
 			:
 			: "memory");
 		return;
@@ -442,7 +443,7 @@ void __uatomic_inc(void *addr, int len)
 	{
 		__asm__ __volatile__(
 		"lock; incl %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(4, addr))
 			:
 			: "memory");
 		return;
@@ -452,7 +453,7 @@ void __uatomic_inc(void *addr, int len)
 	{
 		__asm__ __volatile__(
 		"lock; incq %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(8, addr))
 			:
 			: "memory");
 		return;
@@ -477,7 +478,7 @@ void __uatomic_dec(void *addr, int len)
 	{
 		__asm__ __volatile__(
 		"lock; decb %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(1, addr))
 			:
 			: "memory");
 		return;
@@ -486,7 +487,7 @@ void __uatomic_dec(void *addr, int len)
 	{
 		__asm__ __volatile__(
 		"lock; decw %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(2, addr))
 			:
 			: "memory");
 		return;
@@ -495,7 +496,7 @@ void __uatomic_dec(void *addr, int len)
 	{
 		__asm__ __volatile__(
 		"lock; decl %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(4, addr))
 			:
 			: "memory");
 		return;
@@ -505,7 +506,7 @@ void __uatomic_dec(void *addr, int len)
 	{
 		__asm__ __volatile__(
 		"lock; decq %0"
-			: "=m"(*__hp(len, addr))
+			: "=m"(*__hp(8, addr))
 			:
 			: "memory");
 		return;