From 70a7e80d3ec11ba9f48577910fc2bc4e4926c73e Mon Sep 17 00:00:00 2001
From: Max Regan <mgregan2@gmail.com>
Date: Sat, 20 May 2017 16:47:57 -0700
Subject: [PATCH] gbasm: add support for "ld, r8, r8"

---
 src/gbasm/opcodes.c | 42 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 40 insertions(+), 2 deletions(-)

diff --git a/src/gbasm/opcodes.c b/src/gbasm/opcodes.c
index 08c3132..15a0e28 100644
--- a/src/gbasm/opcodes.c
+++ b/src/gbasm/opcodes.c
@@ -74,8 +74,26 @@ int inc_dec_check(const struct gbasm_parsed_inst *inst,
 	return 0;
 }
 
-size_t inc_emit(struct emitter *emitter,
-                const struct gbasm_parsed_inst *inst)
+static int ld_check(const struct gbasm_parsed_inst *inst,
+                    const struct gbasm_op_info *op_info)
+{
+	if (inst->num_operands < 2) {
+		gbasm_too_many_args_error(inst, op_info);
+	}
+
+	if (inst->num_operands > 2) {
+		gbasm_too_few_args_error(inst, op_info);
+	}
+
+	if (!gbasm_argtype_in_set(op_info->operand_types[0], inst->operands[0].type)) {
+		gbasm_arg_wrong_type_error(inst, op_info);
+	}
+
+	return 0;
+}
+
+static size_t inc_emit(struct emitter *emitter,
+                       const struct gbasm_parsed_inst *inst)
 {
 	uint8_t opcode = 0x00;
 
@@ -144,6 +162,18 @@ size_t dec_emit(struct emitter *emitter,
 	return 1;
 }
 
+size_t ld_emit(struct emitter *emitter,
+                const struct gbasm_parsed_inst *inst)
+{
+	uint64_t opcode = 0x40;
+
+	opcode += inst->operands[0].r8.type * 8;
+	opcode += inst->operands[1].r8.type;
+
+	emit(emitter, &opcode, 1);
+
+	return 1;
+}
 
 struct gbasm_op_info gbasm_op_infos[] = {
 	{
@@ -260,6 +290,14 @@ struct gbasm_op_info gbasm_op_infos[] = {
 		.length = length_one_byte,
 		.emit = dec_emit,
 	},
+	{
+		.opcode = "ld",
+		/* support all of the other operands */
+		.operand_types = { GBASM_OPERAND_REG_8, GBASM_OPERAND_REG_8 },
+		.check = ld_check,
+		.length = length_one_byte,
+		.emit = ld_emit,
+	},
 
 };