Cool_Tools/bemaniutils
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Support a few more basic opcodes in x86 simulator.

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This commit is contained in:
Jennifer Taylor 2021-09-03 22:42:47 +00:00
parent 539c98f8a6
commit b14c9cb90d
1 changed files with 51 additions and 1 deletions
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52
bemani/common/pe.py
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@ -120,6 +120,18 @@ class PEFile:
result = fetch(registers, memory, size, src)
assign(registers, memory, size, dest, result)
elif mnemonic == "add":
dest = formatter.format_operand(inst, 0)
amt = formatter.format_operand(inst, 1)
vprint(f"add {dest}, {amt}")
size = get_size(amt) or get_size(dest)
if size is None:
raise Exception(f"Could not determine size of {mnemonic} operation!")
result = fetch(registers, memory, size, dest) + fetch(registers, memory, size, amt)
assign(registers, memory, size, dest, result)
elif mnemonic == "sub":
dest = formatter.format_operand(inst, 0)
amt = formatter.format_operand(inst, 1)
@ -132,6 +144,25 @@ class PEFile:
result = fetch(registers, memory, size, dest) - fetch(registers, memory, size, amt)
assign(registers, memory, size, dest, result)
elif mnemonic == "imul":
dest = formatter.format_operand(inst, 0)
mult = formatter.format_operand(inst, 1)
try:
const = formatter.format_operand(inst, 2)
vprint(f"imul {dest}, {mult}, {const}")
except Exception:
const = None
vprint(f"imul {dest}, {mult}")
size = get_size(amt) or get_size(dest) or (get_size(const) if const is not None else None)
if size is None:
raise Exception(f"Could not determine size of {mnemonic} operation!")
if const is None:
result = fetch(registers, memory, size, dest) * fetch(registers, memory, size, mult)
else:
result = fetch(registers, memory, size, mult) * get_value(const)
assign(registers, memory, size, dest, result)
elif mnemonic == "push":
src = formatter.format_operand(inst, 0)
@ -276,6 +307,18 @@ class PEFile:
insts = [i for i in decoder]
loc = 0
elif mnemonic == "and":
dest = formatter.format_operand(inst, 0)
src = formatter.format_operand(inst, 1)
vprint(f"and {dest}, {src}")
size = get_size(src) or get_size(dest)
if size is None:
raise Exception(f"Could not determine size of {mnemonic} operation!")
result = fetch(registers, memory, size, dest) & fetch(registers, memory, size, src)
assign(registers, memory, size, dest, result)
elif mnemonic == "or":
dest = formatter.format_operand(inst, 0)
src = formatter.format_operand(inst, 1)
@ -344,6 +387,9 @@ def sanitize(indirect: str) -> str:
if indirect[:5] == "near ":
indirect = indirect[5:]
if indirect[:4] == "rel ":
indirect = indirect[4:]
if indirect[:6] == "short ":
indirect = indirect[6:]
@ -374,11 +420,13 @@ def get_address(registers: Registers, indirect: str) -> Optional[int]:
indirect = sanitize(indirect)
if indirect[0] == "[" and indirect[-1] == "]":
indirect = indirect[1:-1]
indirect = sanitize(indirect[1:-1])
adjust = 0
if '+' in indirect:
indirect, const = indirect.split('+', 1)
indirect = sanitize(indirect)
const = sanitize(const)
if const[-1] == 'h':
adjust = int(const[:-1], 16)
@ -386,6 +434,8 @@ def get_address(registers: Registers, indirect: str) -> Optional[int]:
raise Exception(f"Unsupported constant adjustment to indirect address {indirect}")
elif '-' in indirect:
indirect, const = indirect.split('-', 1)
indirect = sanitize(indirect)
const = sanitize(const)
if const[-1] == 'h':
adjust = -int(const[:-1], 16)