mips/masm/asm.h

/* Copyright (c) 2024 Freya Murphy */

#ifndef __ASM_H__
#define __ASM_H__

#include <stddef.h>

#include "lex.h"
#include "parse.h"

enum symbol_flag {
	SYM_LOCAL,
	SYM_GLOBAL,
	SYM_EXTERNAL,
};

struct symbol {
	char name[MAX_LEX_LENGTH];
	uint32_t index;
	struct section *sec;
	enum symbol_flag flag;

};

struct symbol_table {
	uint32_t count;
	uint32_t len;
	struct symbol *symbols;
};

int symtbl_init(struct symbol_table *sym_tbl);
void symtbl_free(struct symbol_table *sym_tbl);

int symtbl_push(struct symbol_table *sym_tbl, struct symbol sym);
int symtbl_find(struct symbol_table *sym_tbl, struct symbol **sym,
		const char name[MAX_LEX_LENGTH]);


struct str_table {
	char *ptr;
	size_t size;
};

/* initalize a string table */
int strtbl_init(struct str_table *str_tbl);

/* free a string table */
void strtbl_free(struct str_table *str_tbl);

/* get a string form the string table */
int strtbl_get_str(struct str_table *str_tbl, const char *str, size_t *res);

/* get or append a string into the string table */
int strtbl_write_str(struct str_table *str_tbl, const char *str, size_t *res);

struct section_meta {
	void *reltbl;
	uint32_t reltbl_len;
	uint32_t reltbl_idx; // reltbl idx in shdr
	uint32_t shdr_idx; // sec idx in shdr
	uint32_t v_addr;
};

struct assembler {
	// the token lexer
	struct lexer lexer;
	// the expression parser
	struct parser parser;

	// shdr indexes
	struct section_meta *meta;
	size_t shstrtbl_idx;
	size_t strtbl_idx;
	size_t symtab_idx;

	// symbols and strings
	struct symbol_table sym_tbl;
	struct str_table shstr_tbl;
	struct str_table str_tbl;

	// elf data
	void *phdr; // void* since could be Elf32 or Elf64
	void *shdr;
	void *symtab;
	uint32_t phdr_len;
	uint32_t shdr_len;
	uint32_t symtab_len;
};

struct assembler_arguments {
	char *in_file;
	char *out_file;
	enum mips_isa isa;
};

int assembler_init(struct assembler *assembler, const char *path);
void assembler_free(struct assembler *assembler);

int assemble_file(struct assembler_arguments args);

/* assemble a mips32 file*/
int assemble_file_mips32(struct assembler_arguments args);

#endif /* __ASM_H__ */