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mirror of https://gitlab.os-k.eu/os-k-team/kvisc.git synced 2023-08-25 14:05:46 +02:00
kvisc/as/k-as.py
julianb0 61ad104c59
os
2019-05-29 22:59:52 +02:00

440 lines
11 KiB
Python
Executable File

#!/usr/bin/python3
# The OS/K Team licenses this file to you under the MIT license.
# See the LICENSE file in the project root for more information.
import os
import sys
import subprocess
from array import array
from tempfile import TemporaryFile
if len(sys.argv) != 4:
print("Usage: {} (output file) (memory entry point) (source file)"
.format(sys.argv[0]))
sys.exit(1)
instrs = open(".{}.instr".format(sys.argv[3]), "w+")
b_data = open(".{}.data".format(sys.argv[3]), "w+b")
b_text = open(".{}.text".format(sys.argv[3]), "w+b")
lst_regs = open(os.path.join(sys.path[0], "regs.lst"))
lst_instrs = open(os.path.join(sys.path[0], "instrs.lst"))
fi = open(sys.argv[1])
b_out = open(sys.argv[3], "wb")
start_addr = int(sys.argv[2], base=0)
def leave():
fi.close()
instrs.close()
b_out.close()
b_data.close()
b_text.close()
lst_regs.close()
lst_instrs.close()
#-------------------------------------------------------------------------------
# Defines
pdefs = dict()
# registers
pregs = list()
# instructions
pinstrs = list()
# labels
plabels_text = dict()
plabels_data = dict()
# size of .data section
pdata = 0
# size of .text section
ptext = 0
# after parse() is done, pdata and ptext are never modified
# padding bytes between .text and .data
pdata_pad = 0
#-------------------------------------------------------------------------------
def name_valid(name):
for c in name.lower():
if not(c in 'abcdefghijklmnopqrstuvwxyz0123456789[$._+]='):
print("BAD '{}'".format(c))
return False
return True
#-------------------------------------------------------------------------------
def parse_lst_regs():
global pregs
for _, line in enumerate(lst_regs):
pregs.append(line.strip())
def parse_lst_instrs():
global pinstrs
for _, line in enumerate(lst_instrs):
pinstrs.append(line.strip())
#-------------------------------------------------------------------------------
def parse_preproc(line):
global pdata
tok = line.split(' ', 2)
#for word in tok:
# if not name_valid(word):
# print("Invalid token in line: {}".format(line))
# return
# preprocessor
if len(tok) > 1 and tok[1] == ':=':
if len(tok) < 3:
print("Invalid format: {}".format(line))
leave()
sys.exit(1)
pdefs[tok[0]] = tok[2]
return
# .data
if len(tok) > 1 and tok[1] == '=':
if len(tok) < 3:
print("Invalid format: {}".format(line))
leave()
sys.exit(1)
if is_number(tok[2]):
plabels_data[tok[0]] = pdata
written = b_data.write(int(tok[2], base=0).to_bytes(8, byteorder='little', signed=False))
assert(written == 8)
pdata += written
elif tok[2][0] in "'\"":
s = tok[2].strip()
assert(s[-1] == tok[2][0])
s = s[1:-1]
plabels_data[tok[0]] = pdata
pdefs[tok[0] + "_len"] = str(len(s))
for c in s:
written = b_data.write(ord(c).to_bytes(1, byteorder='little', signed=False))
assert(written == 1)
pdata += 1
# align
for i in range(8 - len(s) % 8):
written = b_data.write(int(0).to_bytes(1, byteorder='little', signed=False))
assert(written == 1)
pdata += 1
else:
print("Invalid format: {}".format(line))
leave()
sys.exit(1)
return
print("Unrecognized directive: {}".format(line))
#-------------------------------------------------------------------------------
def apply_pdefs(line):
tok = line.split(' ')
new = '' + tok[0]
if len(tok) > 3:
print("Too many tokens in line: {}".format(line))
return False, None
# 'mov rax, rax' => 'mov rax rax'
if len(tok) == 3 and tok[1][-1] == ',':
tok[1] = tok[1][:-1]
for word in tok[1:]:
new += ' '
if word[0] == '[':
assert(word[-1] == ']')
new += '['
word = word[1:-1]
need_bracket = True
else:
need_bracket = False
if word in pdefs:
word = pdefs[word]
if not name_valid(word):
print("Invalid token in line: {}".format(line))
return False, None
new += word
if need_bracket:
new += ']'
return True, new
def parse():
global ptext
for count, line in enumerate(fi):
line = line.rstrip()
if len(line) == 0:
continue
if line[0] == '#' or line[0] == ';':
continue
if line[0] == ' ' or line[0] == '\t':
line = line.lstrip()
if line[0] in '#;@!/':
continue
ok, line = apply_pdefs(line)
if ok:
# instrs.write("{} ".format(ptext))
ptext += parse_instr(line)
instrs.write("\n")
continue
# Preprocessor or label?
if line[-1] == ':':
if name_valid(line[:-1]):
plabels_text[line[:-1]] = ptext
else:
print("Bad label name: {}".format(line[:-1]))
leave()
sys.exit(1)
continue
# Preprocessor, .data, or invalid
parse_preproc(line)
#-------------------------------------------------------------------------------
def is_number(s):
try:
int(s, base=0)
except ValueError:
return False
return True
def parse_instr(line):
# instrs.write(hex(ptext))
tok = line.split(' ')
fellthrough = False
size = 2
if tok[0] == "rep":
instrs.write("%rep ")
tok = tok[1:]
size += 2
instr_name = tok[0]
instr_args = ''
if len(tok) == 1:
instrs.write("{}".format(instr_name))
return 2 # instruction
tok = tok[1:]
for word in tok:
instr_args += ' '
pref = None
# memory length prefixes
if len(word) > 1 and word[1] == '[':
if word[0] == 'b':
pref = "%b"
elif word[0] == 'w':
pref = "%w"
elif word[0] == 'l' or word[0] == 'd':
pref = "%l"
elif word[0] == 'q':
pref = "%q"
else:
print("Bad memory length prefix")
leave()
sys.exit(1)
word = word[1:]
# [reg+off] or [imm64]
if word[0] == '[':
assert(word[-1] == ']')
word = word[1:-1]
if pref == None:
print("Missing access length modifier: {}".format(line))
leave()
sys.exit(1)
instr_name += "_m"
instr_args += "{}".format(pref)
if '+' in word:
# +2 for A_OFF, +2 for offset, +2 for register
size += 2 + 2 + 2
instr_args += "off "
assert(len(word) > 3)
reg, off = word.strip().split('+', 1)
reg = reg.strip()
off = off.strip()
print(reg)
print(off)
instr_args += "{} {}".format(off, reg)
continue
else:
# +2 for A_MEM
size += 2
instr_args += "mem "
fellthrough = True
# FALLTHROUGH
# for now every immediate is 64-bit
if is_number(word):
# +2 for A_IMM64, +8 for immediate
size += 2 + 8
if not fellthrough:
instr_name += "_i"
instr_args += "%imm64 "
instr_args += word
fellthrough = False
continue
if word in pregs:
size += 2
if not fellthrough:
instr_name += "_r"
instr_args += word
fellthrough = False
continue
# it's a label (a 64-bit immediate)
# +2 for A_IMM64, +8 for immediate
size += 2 + 8
if not fellthrough:
instr_name += "_i"
instr_args += "%imm64 "
instr_args += word
fellthrough = False
instrs.write("{}{}".format(instr_name, instr_args))
return size
#-------------------------------------------------------------------------------
special_syms = {
"%bmem": 0x7001,
"%wmem": 0x7002,
"%lmem": 0x7004,
"%qmem": 0x7008,
"%boff": 0x7701,
"%woff": 0x7702,
"%loff": 0x7704,
"%qoff": 0x7708,
"%imm16": 0x7772,
"%imm32": 0x7774,
"%imm64": 0x7778,
"%rep": 0x8000
}
def gentext():
instrs.seek(0)
text_start = 0 # 0x100000
data_start = text_start + ptext
data_start += (8 - data_start % 8)
for _, line in enumerate(instrs):
tok = line.strip().split(' ')
for word in tok:
if word in pregs:
idx = pregs.index(word)
b_text.write(idx.to_bytes(2, byteorder='little', signed=False))
continue
if word in pinstrs:
idx = pinstrs.index(word)
b_text.write(idx.to_bytes(2, byteorder='little', signed=False))
continue
if word in plabels_text:
addr = text_start + plabels_text[word]
b_text.write(addr.to_bytes(8, byteorder='little', signed=False))
continue
if word in plabels_data:
addr = data_start + plabels_data[word] + pdata_pad
b_text.write(addr.to_bytes(8, byteorder='little', signed=False))
continue
if word in special_syms:
if word == "%imm16":
lastimm = 2
elif word == "%imm32":
lastimm = 4
elif word == "%imm64":
lastimm = 8
elif word[2:] == "off" and word[0] == '%':
lastimm = 2
b_text.write(special_syms[word].to_bytes(2, byteorder='little', signed=False))
continue
if is_number(word):
b_text.write(int(word, base=0).to_bytes(lastimm, byteorder='little', signed=False))
continue
print("Assembly error, unknown token '{}' in line: {}".format(word, line))
leave()
sys.exit(1)
#-------------------------------------------------------------------------------
def genout():
b_text.seek(0)
b_data.seek(0)
b_out.write(b_text.read())
data_align = (8 - ptext % 8)
for i in range(data_align):
b_out.write(int(0).to_bytes(1, byteorder='little', signed=False))
b_out.write(b_data.read())
#-------------------------------------------------------------------------------
parse_lst_instrs()
parse_lst_regs()
parse()
gentext()
genout()
leave()