mips/masm/asm.h

/* Copyright (c) 2024 Freya Murphy */

#ifndef __ASM_H__
#define __ASM_H__

#include <elf.h>

#include "gen.h"

///
/// ELF string table
///

struct elf_str_table {
	// size of the ptr in bytes
	size_t size;

	// pointer that contains
	// the strings
	char *ptr;
};

/* initalize a string table */
int strtab_init(struct elf_str_table *strtab);

/* free a string table */
void strtab_free(struct elf_str_table *strtab);

/* get a string form the string table */
int strtab_get_str(struct elf_str_table *strtab, const char *str, size_t *res);

/* get or append a string into the string table */
int strtab_write_str(struct elf_str_table *strtab, const char *str, size_t *res);

///
/// elf section
///

/* holds a section of the asm file (i.e. .text, .bss, .data) */
struct elf_section {
	// section data *weak* pointer
	struct section *data;

	// index of the section in
	// the ELF shdr
	size_t shdr_idx;

	// relocation table
	size_t reltab_shidx;
	uint32_t reltab_len;
	Elf32_Rel *reltab;
};

///
/// assembler
///

struct assembler {
	// the code generator
	struct generator gen;

	/// symbol table
	size_t symtab_shidx;
	size_t symtab_len;
	Elf32_Sym *symbols;

	// sh string table
	size_t strtab_shidx;
	struct elf_str_table strtab;

	// string table
	size_t shstrtab_shidx;
	struct elf_str_table shstrtab;

	/// sections
	uint32_t section_len;
	struct elf_section *sections;

	/// section header
	Elf32_Shdr *shdr;
	uint32_t shdr_len;
};

/* defines arguments to the assembler */
struct assembler_arguments {
	char *in_file;
	char *out_file;
};

/* initalize the assembler */
int assembler_init(struct assembler *assembler, const char *path);

/* free the assembler */
void assembler_free(struct assembler *assembler);

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

#endif /* __ASM_H__ */