From b663f827057fc9fb199293bc1920cf27315d1846 Mon Sep 17 00:00:00 2001
From: Freya Murphy <freya@freyacat.org>
Date: Wed, 9 Oct 2024 12:07:59 -0400
Subject: refactor elf32 assembler, add support for multiple isa's in cmdline

---
 masm/main.c | 134 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 126 insertions(+), 8 deletions(-)

(limited to 'masm/main.c')

diff --git a/masm/main.c b/masm/main.c
index caa8420..a97d949 100644
--- a/masm/main.c
+++ b/masm/main.c
@@ -1,33 +1,151 @@
 #include <unistd.h>
 #include <merror.h>
 #include <string.h>
+#include <stdio.h>
 
-#include "asm.h"
+#include "gen.h"
+#include "masm.h"
+#include "asm/elf32.h"
 
 void help(void) {
-	printf("usage: masm [options] source.asm\n\n");
-	printf("options:\n");
-	printf("\t-h\t\tprints this help message\n");
-	printf("\t-o <output>\tselect a output file destination\n");
+	printf(
+"usage: masm [options] source.asm\n"
+"\n"
+"options: \n"
+"	-h		print the help message \n"
+"	-g		assume undefined symbols are external\n"
+"	-o <output>	specify the object file output name \n"
+"	-a <abi>	specify mips abi used [none, o32] \n"
+"			default: o32 \n"
+"	-i <isa>	mips machine isa to assemble for [mips1, mips32r2, mips32r6] \n"
+"			default: mips32r6\n"
+"	-f <format>	specify the object file format [elf32] \n"
+"			defualt: elf32\n"
+	);
+}
+
+static int read_isa(enum isa *isa, const char *str)
+{
+	#define __ISA_CHK(name) \
+		if (strcasecmp(#name, str) == 0) { \
+			*isa = ISA_ ##name; \
+			return M_SUCCESS; \
+		} \
+
+	__ISA_CHK(MIPS1);
+	__ISA_CHK(MIPS32R2);
+	__ISA_CHK(MIPS32R6);
+
+	ERROR("invalid isa '%s'", str);
+	return M_ERROR;
+}
+
+static int read_abi(enum abi *abi, const char *str)
+{
+	#define __ABI_CHK(name) \
+		if (strcasecmp(#name, str) == 0) { \
+			*abi = ABI_ ##name; \
+			return M_SUCCESS; \
+		} \
+
+
+	__ABI_CHK(O32);
+	__ABI_CHK(NONE);
+
+	ERROR("invalid abi '%s'", str);
+	return M_ERROR;
+}
+
+static int read_format(enum format *format, const char *str)
+{
+	#define __FORMAT_CHK(name) \
+		if (strcasecmp(#name, str) == 0) { \
+			*format = FORMAT_ ##name; \
+			return M_SUCCESS; \
+		} \
+
+
+	__FORMAT_CHK(ELF32);
+
+	ERROR("invalid format '%s'", str);
+	return M_ERROR;
+}
+
+static int generate(struct generator *gen, struct arguments *args)
+{
+	if (generator_init(args->in_file, gen))
+		return M_ERROR;
+
+	switch (args->isa) {
+        case ISA_MIPS1:
+		return generate_mips1(gen);
+        case ISA_MIPS32R2:
+		return generate_mips32r2(gen);
+        case ISA_MIPS32R6:
+		return generate_mips32r6(gen);
+        }
+
+	return M_ERROR;
+}
+
+static int assemble(struct arguments *args)
+{
+	struct generator gen;
+	int res = M_SUCCESS;
+
+	if (generate(&gen, args))
+		return M_ERROR;
+
+	switch (args->format) {
+        case FORMAT_ELF32:
+		res = assemble_elf32(&gen, args);
+		break;
+	default:
+		res = M_ERROR;
+		break;
+        }
+
+	generator_free(&gen);
+
+	return res;
 }
 
 int main(int argc, char **argv) {
 
-	struct assembler_arguments args = {
+	struct arguments args = {
 		.in_file = NULL,
 		.out_file = "out.o",
+		.extern_undefined = false,
+		.isa = ISA_MIPS32R6,
+		.abi = ABI_O32,
+		.format = FORMAT_ELF32
 	};
 
 	int c;
 
-	while ((c = getopt(argc, argv, "ho:")) != 1) {
+	while ((c = getopt(argc, argv, "hgo:a:i:f:")) != 1) {
 		switch(c) {
 		case 'h':
 			help();
 			return M_SUCCESS;
+		case 'g':
+			args.extern_undefined = true;
+			break;
 		case 'o':
 			args.out_file = optarg;
 			break;
+		case 'a':
+			if (read_abi(&args.abi, optarg))
+				return M_ERROR;
+			break;
+		case 'i':
+			if (read_isa(&args.isa, optarg))
+				return M_ERROR;
+			break;
+		case 'f':
+			if (read_format(&args.format, optarg))
+				return M_ERROR;
+			break;
 		case '?':
 			return M_ERROR;
 		default:
@@ -48,5 +166,5 @@ next:
 
 	args.in_file = argv[optind];
 
-	return assemble_file(args);
+	return assemble(&args);
 }
-- 
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