[1/3] add support for arch specific asm constraints

Commit Message

Luc Van Oostenryck July 4, 2020, 1:57 p.m. UTC

When evaluating asm operands it must be known if they correspond
to a memory operand or not in order to process/ignore the 'noderef'
attribute.

This is done for operands specified with the common constraints
but not for the machine specific constraints.

So, add support for processing machine specific constraints.

Signed-off-by: Luc Van Oostenryck <[e-mail]>
---
 evaluate.c | 5 ++++-
 target.h   | 3 ++-
 2 files changed, 6 insertions(+), 2 deletions(-)

Patch

diff --git a/evaluate.c b/evaluate.c
index 3b9aec3c13c0..f515ce6f2de6 100644
--- a/evaluate.c
+++ b/evaluate.c
@@ -3642,7 +3642,10 @@  static void parse_asm_constraint(struct asm_operand *op)
 			return;
 
 		default:
-			// FIXME: arch-specific (and multi-letter) constraints
+			if (arch_target->asm_constraint)
+				str = arch_target->asm_constraint(op, c, str);
+
+			// FIXME: multi-letter constraints
 			break;
 		}
 	}
diff --git a/target.h b/target.h
index 8640026cc6d4..3ef0d520f83c 100644
--- a/target.h
+++ b/target.h
@@ -53,7 +53,7 @@  extern int pointer_alignment;
 extern int bits_in_enum;
 extern int enum_alignment;
 
-
+struct asm_operand;
 struct builtin_fn;
 
 struct target {
@@ -77,6 +77,7 @@  struct target {
 
 	void (*init)(const struct target *self);
 	void (*predefine)(const struct target *self);
+	const char *(*asm_constraint)(struct asm_operand *op, int c, const char *str);
 };
 
 extern const struct target target_default;