[PATCH 2/3] add memory asm constraint for PPC

[Luc Van Oostenryck <luc.vanoostenryck@gmail.com>]

The 'Z' asm constraint is used for doing IO accessors on PPC but
isn't part of the 'common constraints'. It's responsible for
more than half of all warnings (with defconfig + allyesconfig).

Fix this by handling this constraint in a specific method for PPC.

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
---
 target-ppc.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/target-ppc.c b/target-ppc.c
index b138635b9103..c0d6068f436a 100644
--- a/target-ppc.c
+++ b/target-ppc.c
@@ -1,6 +1,7 @@
 #include "symbol.h"
 #include "target.h"
 #include "machine.h"
+#include "expression.h"
 
 
 static void predefine_ppc(const struct target *self)
@@ -15,6 +16,16 @@ static void predefine_ppc(const struct target *self)
 		predefine("_BIG_ENDIAN", 1, "1");
 }
 
+static const char *asm_constraint_ppc(struct asm_operand *op, int c, const char *str)
+{
+	switch (c) {
+	case 'Z':
+		op->is_memory = true;
+		break;
+	}
+	return str;
+}
+
 
 static void predefine_ppc32(const struct target *self)
 {
@@ -32,6 +43,7 @@ const struct target target_ppc32 = {
 	.target_64bit = &target_ppc64,
 
 	.predefine = predefine_ppc32,
+	.asm_constraint = asm_constraint_ppc,
 };
 
 
@@ -55,4 +67,5 @@ const struct target target_ppc64 = {
 	.target_32bit = &target_ppc32,
 
 	.predefine = predefine_ppc64,
+	.asm_constraint = asm_constraint_ppc,
 };
-- 
2.27.0