refactor elf32 assembler, add support for multiple isa's in cmdline

1 files changed, 90 insertions, 0 deletions

diff --git a/masm/asm/elf32.h b/masm/asm/elf32.h
new file mode 100644
index 0000000..76aeb19
--- /dev/null
+++ b/masm/asm/elf32.h
@@ -0,0 +1,90 @@
+/* Copyright (c) 2024 Freya Murphy */
+
+#ifndef __ELF32_H__
+#define __ELF32_H__
+
+#include <elf.h>
+
+#include "../gen.h"
+#include "../masm.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 elf_assembler {
+	// arguments passed in
+	struct arguments *args;
+
+	// 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;
+};
+
+int assemble_elf32(struct generator *gen, struct arguments *args);
+
+#endif /* __ELF32_H__ */