/* radare - LGPL - Copyright 2015-2021 - pancake */

// TODO: no assembler support

#include <stdio.h>
#include <stdarg.h>
#include <string.h>

#include <r_types.h>
#include <r_util.h>
#include <r_lib.h>
#include <r_asm.h>

#include "disas-asm.h"
#include "../arch/include/opcode/alpha.h"

static unsigned long Offset = 0;
static RStrBuf *buf_global = NULL;
static const ut8 *bytes = NULL;
static int bytes_size = 0;

static int alpha_buffer_read_memory(bfd_vma memaddr, bfd_byte *myaddr, ut32 length, struct disassemble_info *info) {
	int delta = (memaddr - Offset);
	if (delta < 0) {
		return -1; // disable backward reads
	}
	memcpy (myaddr, bytes + delta, R_MIN (length, bytes_size));
	return 0;
}

static int symbol_at_address(bfd_vma addr, struct disassemble_info * info) {
	return 0;
}

static void memory_error_func(int status, bfd_vma memaddr, struct disassemble_info *info) {
	//--
}

DECLARE_GENERIC_PRINT_ADDRESS_FUNC()
DECLARE_GENERIC_FPRINTF_FUNC()

static int disassemble(RAsm *a, RAsmOp *op, const ut8 *buf, int len) {
	struct disassemble_info disasm_obj;
	if (len < 4) {
		return -1;
	}
	buf_global = &op->buf_asm;
	bytes = buf;
	bytes_size = len;
	Offset = a->pc;

	/* prepare disassembler */
	memset (&disasm_obj, '\0', sizeof (struct disassemble_info));
	disasm_obj.buffer = (ut8*)bytes;
	disasm_obj.read_memory_func = &alpha_buffer_read_memory;
	disasm_obj.symbol_at_address_func = &symbol_at_address;
	disasm_obj.memory_error_func = &memory_error_func;
	disasm_obj.print_address_func = &generic_print_address_func;
	disasm_obj.endian = BFD_ENDIAN_LITTLE;
	disasm_obj.fprintf_func = &generic_fprintf_func;
	disasm_obj.stream = stdout;
	op->size = print_insn_alpha ((bfd_vma)Offset, &disasm_obj);

	if (op->size == -1) {
		r_asm_op_set_asm (op, "(data)");
	}
	return op->size;
}

RAsmPlugin r_asm_plugin_alpha = {
	.name = "alpha",
	.arch = "alpha",
	.license = "GPL",
	.bits = 64,
	.endian = R_SYS_ENDIAN_LITTLE,
	.desc = "ALPHA architecture disassembler",
	.disassemble = &disassemble
};

#ifndef R2_PLUGIN_INCORE
R_API RLibStruct radare_plugin = {
	.type = R_LIB_TYPE_ASM,
	.data = &r_asm_plugin_alpha,
	.version = R2_VERSION
};
#endif
