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ppc2c.py
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# PPC To C
#
# by working with the disassembled text this plugin should
# work with both big and little endian PPC.
from ida_bytes import *
from idaapi import *
from idc import *
import ida_ida
import idaapi
import ida_bytes
import idc
SIMPLIFY = 1
MASK32_ALLSET = 0xFFFFFFFF
MASK64_ALLSET = 0xFFFFFFFFFFFFFFFF
g_mnem = 0
g_opnd_s0 = 0
g_opnd_s1 = 0
g_opnd_s2 = 0
g_opnd_s3 = 0
g_opnd_s4 = 0
g_RA = 0
g_RS = 0
g_RB = 0
g_SH = 0
g_MB = 0
g_ME = 0
# generates the mask between MaskBegin(MB) and MaskEnd(ME) inclusive
# MB and ME should be values 0 - 31
def GenerateMask32(MB, ME):
if( MB < 0 or ME < 0 or MB > 31 or ME > 31 ):
msg("Error with paramters GenerateMask32({:d}, {:d})\n".format(MB, ME))
return 0
mask = 0
if(MB < ME+1):
# normal mask
while MB < ME+1:
mask = mask | (1<<(31-MB))
MB += 1
elif(MB == ME+1):
# all mask bits set
mask = MASK32_ALLSET
elif(MB > ME+1):
# split mask
mask_lo = GenerateMask32(0, ME)
mask_hi = GenerateMask32(MB, 31)
mask = mask_lo | mask_hi
return mask
# generates the mask between MaskBegin(MB) and MaskEnd(ME) inclusive
# MB and ME should be values 0 - 63
def GenerateMask64(MB, ME):
if( MB < 0 or ME < 0 or MB > 63 or ME > 63 ):
msg("Error with paramters GenerateMask64({:d}, {:d})\n".format(MB, ME))
return 0
mask = 0
if(MB < ME+1):
# normal mask
while MB < ME+1:
mask = mask | (1<<(63-MB))
MB += 1
elif(MB == ME+1):
# all mask bits set
mask = MASK64_ALLSET
elif(MB > ME+1):
# split mask
mask_lo = GenerateMask64(0, ME)
mask_hi = GenerateMask64(MB, 63)
mask = mask_lo | mask_hi
return mask
# generate string showing rotation or shifting within instruction
def GenerateRotate32(src, leftShift, rightShift, mask):
ret_str = 0
# work out "rotate" part of the instruction
if( (leftShift== 0 and rightShift==32) or (leftShift==32 and rightShift== 0 )):
return src
if(((MASK32_ALLSET<<leftShift ) & mask) == 0):
# right shift only
if((MASK32_ALLSET>>rightShift) == mask):
mask = MASK32_ALLSET
ret_str = src + " >> {:d}".format(rightShift)
elif(((MASK32_ALLSET>>rightShift) & mask) == 0):
# left shift only
if((MASK32_ALLSET<<leftShift) == mask):
mask = MASK32_ALLSET
ret_str = src + " << {:d}".format(leftShift)
else:
# shift both ways
ret_str = "(" + src + " << {:d}) | (".format(leftShift) + src + " >> {:d})".format(rightShift)
return ret_str
# generate string showing rotation or shifting within instruction
def GenerateRotate64(src, leftShift, rightShift, mask):
# work out "rotate" part of the instruction
if((leftShift == 0 and rightShift == 64) or (leftShift == 64 and rightShift == 0)):
# no rotation
return src
if(((MASK64_ALLSET<<leftShift ) & mask) == 0):
# right shift only
if((MASK64_ALLSET>>rightShift) == mask):
mask = MASK64_ALLSET
ret_str = src + " >> {:d}".format(rightShift)
elif(((MASK64_ALLSET>>rightShift) & mask) == 0):
# left shift only
if((MASK64_ALLSET<<leftShift) == mask):
mask = MASK64_ALLSET
ret_str = src + " << {:d}".format(leftShift)
else:
# shift both ways
ret_str = "(" + src + " << {:d}) | (".format(leftShift) + src + " >> {:d})".format(rightShift)
return ret_str
# register rotate and immediate mask
def Rotate_iMask32(ea, g_mnem, g_RA, g_RS, leftRotate, mb, me):
ret_str = 0
# calculate the mask
# if no mask, then result is always 0
mask = GenerateMask32(mb, me)
if(mask == 0):
# no rotation
ret_str = g_RA + " = 0"
return ret_str
# work out "rotate" part of the instruction
# if all mask bits are set, then no need to use the mask
rot_str = 0
rot_str = g_RS + " << " + leftRotate + " | " + g_RS + " >> 32 - " + leftRotate
if(mask == MASK32_ALLSET):
ret_str = g_RA + " = " + rot_str
return ret_str
# generate mask string
mask_str = 0
if (mask < 10):
mask_str = "{:X}".format(mask)
else:
mask_str = "0x{:X}".format( mask)
# generate the resultant string
# "%s = (%s) & %s"
ret_str = g_RA + " = " + "(" + rot_str + ") & " + mask_str
return ret_str
# immediate rotate and immediate mask
def iRotate_iMask32(ea, g_mnem, g_RA, g_RS, leftRotate, mb, me):
ret_str = 0
# calculate the mask
# if no mask, then result is always 0
mask = GenerateMask32(mb, me)
if(mask == 0):
ret_str = g_RA + " = 0"
return ret_str
# work out "rotate" part of the instruction
# if all mask bits are set, then no need to use the mask
rot_str = 0
rot_str = GenerateRotate32(g_RS, leftRotate, 32-leftRotate, mask)
if(mask == MASK32_ALLSET):
ret_str = g_RA + " = " + rot_str
return ret_str
# generate mask string
mask_str = 0
if (mask < 10):
mask_str = "{:X}".format(mask)
else:
mask_str = "0x{:X}".format(mask)
# no bracelets
if (rot_str == g_RS):
ret_str = g_RA + " = " + rot_str + " & " + mask_str
else:
ret_str = g_RA + " = " + "(" + rot_str + ") & " + mask_str
return ret_str
# insert immediate rotate and immediate mask
def insert_iRotate_iMask32(ea, g_mnem, g_RA, g_RS, leftRotate, mb, me):
ret_str = 0
# calculate the mask
# if no mask, then result is always 0
mask = GenerateMask32(mb, me)
if(mask == 0):
ret_str = g_RA + " = " + g_RA
return ret_str
# work out "rotate" part of the instruction
# if all mask bits are set, then no need to use the mask
rot_str = 0
rot_str = GenerateRotate32(g_RS, leftRotate, 32-leftRotate, mask)
if(mask == MASK32_ALLSET):
ret_str = g_RA + " = " + rot_str
return ret_str
# generate mask strings
mask_str = 0
not_mask = 0
not_mask_str = 0
# generate mask string
if (mask < 10):
mask_str = "{:X}".format(mask)
else:
mask_str = "0x{:X}".format( mask)
# no bracelets
if (rot_str == g_RS):
ret_str = g_RA + " = (" + g_RA + " & ~" + mask_str + ") | (" + rot_str + " & " + mask_str + ")"
else:
ret_str = g_RA + " = (" + g_RA + " & ~" + mask_str + ") | ((" + rot_str + ") & " + mask_str + ")"
return ret_str
# register rotate and immediate mask
def Rotate_iMask64(ea, g_mnem, g_RA, g_RS, leftRotate, mb, me):
ret_str = 0
# calculate the mask
# if no mask, then result is always 0
mask = GenerateMask64(mb, me)
if(mask == 0):
ret_str = g_RA + " = 0"
return ret_str
# work out "rotate" part of the instruction
# if all mask bits are set, then no need to use the mask
rot_str = 0
rot_str = g_RS + " << " + leftRotate + " | " + g_RS + " >> 64-" + leftRotate
if(mask == MASK64_ALLSET):
#qsnprintf(buff, buffSize, "%s = (u32)(%s)", g_RA, rot_str)
ret_str = g_RA + " = " + rot_str
return ret_str
# generate mask string
mask_str = 0
if (mask < 10):
mask_str = "{:X}".format(mask)
else:
mask_str = "0x{:X}".format( mask)
# generate the resultant string
ret_str = g_RA + " = " + "(" + rot_str + ") & " + mask_str
return ret_str
# immediate rotate and immediate mask
def iRotate_iMask64(ea, g_mnem, g_RA, g_RS, leftRotate, mb, me):
ret_str = 0
# calculate the mask
# if no mask, then result is always 0
mask = GenerateMask64(mb, me)
if(mask == 0):
ret_str = g_RA + " = 0"
return ret_str
# work out "rotate" part of the instruction
# if all mask bits are set, then no need to use the mask
rot_str = 0
rot_str = GenerateRotate64(g_RS, leftRotate, 64-leftRotate, mask)
if(mask == MASK64_ALLSET):
ret_str = g_RA + " = " + rot_str
return ret_str
# generate mask string
mask_str = 0
if (mask < 10):
mask_str = "{:X}".format(mask)
else:
mask_str = "0x{:X}".format( mask)
# no bracelets
if (rot_str == g_RS):
ret_str = g_RA + " = " + rot_str + " & " + mask_str
else:
ret_str = g_RA + " = " + "(" + rot_str + ") & " + mask_str
return ret_str
# insert immediate rotate and immediate mask
def insert_iRotate_iMask64(ea, g_mnem, g_RA, g_RS, leftRotate, mb, me):
ret_str = 0
# calculate the mask
# if no mask, then result is always 0
mask = GenerateMask64(mb, me)
if(mask == 0):
ret_str = g_RA + " = " + g_RA
return ret_str
# work out "rotate" part of the instruction
# if all mask bits are set, then no need to use the mask
rot_str = 0
rot_str = GenerateRotate64(g_RS, leftRotate, 64-leftRotate, mask)
if(mask == MASK64_ALLSET):
ret_str = g_RA + " = " + rot_str
return ret_str
# generate mask strings
mask_str = 0
not_mask = 0
not_mask_str = 0
# generate mask string
if (mask < 10):
mask_str = "{:X}".format(mask)
else:
mask_str = "0x{:X}".format(mask)
# no bracelets
if (rot_str == g_RS):
ret_str = g_RA + " = (" + g_RA + " & ~" + mask_str + ") | (" + rot_str + " & " + mask_str + ")"
else:
ret_str = g_RA + " = (" + g_RA + " & ~" + mask_str + ") | ((" + rot_str + ") & " + mask_str + ")"
return ret_str
# ==================================================================
#
# helpers
#
# ==================================================================
def search_for_matching_opcode_backwards(ea, search, g_opnd_s0, g_opnd_s1, g_opnd_s2):
if (SIMPLIFY == 0):
return 0
# Find matching opcode
temp_ea = ea - 4
while(temp_ea > ea - 0x20):
g_mnem = print_insn_mnem(temp_ea)
# Remove record bit if exist
dot = "."
dot = g_mnem.find(dot)
if(dot != -1):
g_mnem = g_mnem[0:dot]
# Check for matching opcode
if(g_mnem == search and print_operand(temp_ea, 0) == g_opnd_s1):
return PPCAsm2C(temp_ea)
temp_ea -= 4
return 0
def simplify64(orig_ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME):
if (SIMPLIFY == 0):
return 0
if (g_mnem == "rldicl" and g_ME != 63 or g_SH == 0):
return 0
if (g_mnem in ["sldi", "extldi"] and g_SH == 0):
return 0
# Find matching opcode
ea = orig_ea + 4
while(ea < orig_ea + 0x20):
g_mnem2 = print_insn_mnem(ea)
# Remove record bit if exist
dot = "."
dot = g_mnem2.find(dot)
if(dot != -1):
g_mnem2 = g_mnem2[0:dot]
# If RA is modified earlier, we need to break and handle it old way.
# This helps eliminate false detection when there is not paired rotxdi.
if(print_operand(ea, 0) == g_RA):
if ((g_mnem == "rldicl" and g_mnem2 not in ["rotldi", "rotrdi", "rldicl"])
or (g_mnem in ["extldi", "sldi"] and g_mnem2 != "extldi")):
print("Rare case! " + g_mnem2 + " " + print_operand(ea, 0))
return 0
if((g_mnem == "rldicl" and g_mnem2 in ["rotldi", "rotrdi", "rldicl"])
or (g_mnem in ["extldi", "sldi"] and g_mnem2 == "extldi")):
g_opnd_t0 = print_operand(ea, 0)
g_opnd_t1 = print_operand(ea, 1)
g_opnd_t2 = print_operand(ea, 2)
if(g_mnem2 in ["rldicl", "extldi"]):
comma = ","
comma = g_opnd_t2.find(comma)
if(comma != -1):
g_opnd_t3 = g_opnd_t2[comma+1:]
g_opnd_t2 = g_opnd_t2[0:comma]
g_opnd_t2 = int(g_opnd_t2)
g_opnd_t3 = int(g_opnd_t3)
else:
g_opnd_t2 = int(g_opnd_t2)
# Check if next opcode is using result from first one.
if(g_opnd_t1 == g_RA):
# Check if "counter rotate" is exatcly the same as rotate.
# This ensure compiler was trying to do one of supported operations.
if(g_mnem == "rldicl" and g_mnem2 in ["rotldi", "rldicl"] and g_opnd_t2 != 64-g_SH):
return 0
elif(g_mnem == "rldicl" and g_mnem2 == "rotrdi" and g_opnd_t2 != g_SH):
return 0
elif(g_mnem in ["sldi", "extldi"] and g_opnd_t3 + g_SH != 64):
return 0
mask = GenerateMask64(g_MB, g_ME)
mask = ((mask >> g_SH) | (mask << (64-g_SH))) & MASK64_ALLSET
if (g_mnem == "rldicl"):
mask = ~mask & MASK64_ALLSET
upper_mask = mask >> 32
lower_mask = mask & MASK32_ALLSET
tilde = "~"
if(g_mnem2 == "rldicl"):
new_mask = GenerateMask64(g_opnd_t3, 63)
new_mask = ~new_mask & MASK64_ALLSET
new_upper_mask = new_mask >> 32
new_lower_mask = new_mask & MASK32_ALLSET
upper_mask = new_upper_mask | upper_mask
lower_mask = new_lower_mask | lower_mask
upper_mask = ~upper_mask & MASK32_ALLSET
lower_mask = ~lower_mask & MASK32_ALLSET
tilde = ""
elif(g_mnem in ["sldi", "extldi"] and g_mnem2 == "extldi"):
new_mask = GenerateMask64(0, g_opnd_t2-1)
mask = mask & new_mask
upper_mask = mask >> 32
lower_mask = mask & MASK32_ALLSET
tilde = ""
first_mnem_comment = "Paired with " + g_mnem2 + " at 0x{:X}".format(ea)
if(upper_mask != 0):
second_mnem_comment = g_opnd_t0 + " = " + g_RS + " & " + tilde + "0x{:X}_{:08X} (".format(upper_mask, lower_mask) + g_RS + " from 0x{:X})".format(orig_ea)
else:
second_mnem_comment = g_opnd_t0 + " = " + g_RS + " & " + tilde + "0x{:X} (".format(lower_mask) + g_RS + " from 0x{:X})".format(orig_ea)
set_cmt(ea, second_mnem_comment, 0)
set_cmt(orig_ea , first_mnem_comment, 0)
return 1
ea += 4
# matching opcode not found, fallback to default handling.
return 0
def rlwinm_andnot(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME):
if (SIMPLIFY == 0 or g_ME != 31 or g_SH == 0):
return 0
mask = GenerateMask32(g_MB, g_ME)
mask = ((mask >> g_SH) | (mask << (32-g_SH))) & MASK32_ALLSET
mask = ~mask & MASK32_ALLSET
# Find matching rotxwi
rotea = ea + 4
while(rotea < ea + 0x20):
# Remove record bit if exist
is_rotxwi = print_insn_mnem(rotea)[:6]
# If rlwinm RA is modified earlier, we need to break and handle it old way.
# This helps eliminate false detection when there is not paired rotxwi.
if(print_operand(rotea, 0) == g_RA and is_rotxwi != "rotlwi" and is_rotxwi != "rotrwi"):
print("Rare case!")
return 0
if(is_rotxwi == "rotlwi" or is_rotxwi == "rotrwi"):
g_opnd_t0 = print_operand(rotea, 0)
g_opnd_t1 = print_operand(rotea, 1)
g_opnd_t2 = int(print_operand(rotea, 2))
# Check if rotate is using result from rlwinm
if(g_opnd_t1 == g_RA):
# Check if "counter rotate" is exatcly the same as rotate in rlwinm.
# This ensure compiler was trying to do "and not".
if(is_rotxwi == "rotlwi" and g_opnd_t2 != 32-g_SH):
return 0
elif(is_rotxwi == "rotrwi" and g_opnd_t2 != g_SH):
return 0
rlwinm_comment = "Paired with " + is_rotxwi + " at 0x{:X}".format(rotea)
rotxwi_comment = g_opnd_t0 + " = " + g_RS + " & ~0x{:X} (".format(mask) + g_RS + " from 0x{:X})".format(ea)
set_cmt(rotea, rotxwi_comment, 0)
set_cmt(ea , rlwinm_comment, 0)
return 1
rotea += 4
# rotxwi not found, fallback to default handling.
return 0
# ==================================================================
#
# instructions
#
# ==================================================================
def clrlwi(ea, g_mnem, g_RA, g_RS, n):
# Clear left immediate
# clrlwi RA, RS, n
# rlwinm RA, RS, 0, n, 31
g_SH = 0
g_MB = n
g_ME = 31
return iRotate_iMask32(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def clrldi(ea, g_mnem, g_RA, g_RS, n):
# Rotate Left Double Word Immediate then Clear Left
# clrldi RA, RS, n
# rldicl RA, RS, 0, n
g_SH = 0
g_MB = n
g_ME = 63
return iRotate_iMask64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def clrrwi(ea, g_mnem, g_RA, g_RS, n):
# Clear right immediate
# clrrwi RA, RS, n
# rlwinm RA, RS, 0, 0, 31-n
g_SH = 0
g_MB = 0
g_ME = 31-n
return iRotate_iMask32(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def clrrdi(ea, g_mnem, g_RA, g_RS, n):
# Clear right immediate
# clrrdi RA, RS, n
# rldicr RA, RS, 0, 63 - n
g_SH = 0
g_MB = 0
g_ME = 63-n
return iRotate_iMask64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def clrlslwi(ea, g_mnem, g_RA, g_RS, b, n):
# Clear left word and shift left immediate
# clrlslwi RA, RS, b, n
# rlwinm RA, RS, b-n, 31-n
g_SH = n
g_MB = b-n
g_ME = 31-n
return iRotate_iMask32(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def clrlsldi(ea, g_mnem, g_RA, g_RS, b, n):
# Clear left double word and shift left immediate
# clrlsldi RA, RS, b, n
# rldic RA, RS, n, b - n
g_SH = n
g_MB = b-n
g_ME = 63-n
return iRotate_iMask64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def extrwi(ea, g_mnem, g_RA, g_RS, n, b):
# Extract and right justify immediate
# extrwi RA, RS, n, b
# rlwinm RA, RS, b+n, 32-n, 31
g_SH = b+n
g_MB = 32-n
g_ME = 31
return iRotate_iMask32(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def extrdi(ea, g_mnem, g_RA, g_RS, n ,b):
# Extract double word and right justify immediate
# extrdi RA, RS, n, b
# rldicl RA, RS, b + n, 64 - n
g_SH = b+n
g_MB = 64-n
g_ME = 63
return iRotate_iMask64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def extlwi(ea, g_mnem, g_RA, g_RS, n, b):
# Extract and left justify immediate
# extlwi RA, RS, n, b
# rlwinm RA, RS, b, 0, n-1
g_SH = b
g_MB = 0
g_ME = n-1
return iRotate_iMask32(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def extldi(ea, g_mnem, g_RA, g_RS, n, b):
# Extract double word and left justify immediate
# extldi RA, RS, n, b
# rldicr RA, RS, b, n - 1
g_SH = b
g_MB = 0
g_ME = n-1
if(simplify64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME) == 1):
return 1
if(search_for_matching_opcode_backwards(ea, "sldi", g_RA, g_RS, n) == 1):
return 1
if(search_for_matching_opcode_backwards(ea, "extldi", g_RA, g_RS, n) == 1):
return 1
return iRotate_iMask64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def inslwi(ea, g_mnem, g_RA, g_RS, n, b):
# Insert from left immediate
# inslwi RA, RS, n, b
# rlwimi RA, RS, 32-b, b, (b+n)-1
g_SH = 32-b
g_MB = b
g_ME = b+n-1
return insert_iRotate_iMask32(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def insrwi(ea, g_mnem, g_RA, g_RS, n, b):
# Insert from right immediate
# insrwi RA, RS, n, b
# rlwimi RA, RS, 32-(b+n), b, (b+n)-1
g_SH = 32-(b+n)
g_MB = b
g_ME = b+n-1
return insert_iRotate_iMask32(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def insrdi(ea, g_mnem, g_RA, g_RS, n, b):
# Insert double word from right immediate
# insrdi RA, RS, n, b
# rldimi RA, RS, 64 - (b + n), b
g_SH = 64-(b+n)
g_MB = b
g_ME = b+n-1
return insert_iRotate_iMask64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def rlwinm(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME):
# Rotate Left Word Immediate Then AND with Mask
# rlwinm RA, RS, SH, MB, ME
if (rlwinm_andnot(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME) == 1):
return 1
return iRotate_iMask32(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def rlwnm(ea, g_mnem, g_RA, g_RS, g_RB, g_MB, g_ME):
# Rotate Left Word Then AND with Mask
# rlwnm RA, RS, RB, MB, ME
return Rotate_iMask32(ea, g_mnem, g_RA, g_RS, g_RB, g_MB, g_ME)
def rotlwi(ea, g_mnem, g_RA, g_RS, n):
# Rotate left immediate
# rotlwi RA, RS, n
# rlwinm RA, RS, n, 0, 31
g_SH = n
g_MB = 0
g_ME = 31
if(search_for_matching_opcode_backwards(ea, "rlwinm", g_RA, g_RS, n) == 1):
return 1
return iRotate_iMask32(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def rotrwi(ea, g_mnem, g_RA, g_RS, n):
# Rotate right immediate
# rotrwi RA, RS, n
# rlwinm RA, RS, 32-n, 0, 31
g_SH = 32-n
g_MB = 0
g_ME = 31
if(search_for_matching_opcode_backwards(ea, "rlwinm", g_RA, g_RS, n) == 1):
return 1
return iRotate_iMask32(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def rotldi(ea, g_mnem, g_RA, g_RS, n):
# Rotate left immediate
# rotldi RA, RS, n
# rldicl RA, RS, n, 0
g_SH = n
g_MB = 0
g_ME = 63
if(search_for_matching_opcode_backwards(ea, "rldicl", g_RA, g_RS, n) == 1):
return 1
return iRotate_iMask64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def rotrdi(ea, g_mnem, g_RA, g_RS, n):
# Rotate right immediate
# rotrdi RA, RS, n
# rldicl RA, RS, 64 - n, 0
g_SH = 64-n
g_MB = 0
g_ME = 63
if(search_for_matching_opcode_backwards(ea, "rldicl", g_RA, g_RS, n) == 1):
return 1
return iRotate_iMask64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def rotlw(ea, g_mnem, g_RA, g_RS, g_RB):
# Rotate left
# rotlw RA, RS, RB
# rlwnm RA, RS, RB, 0, 31
g_MB = 0
g_ME = 31
return Rotate_iMask32(ea, g_mnem, g_RA, g_RS, g_RB, g_MB, g_ME)
def rotld(ea, g_mnem, g_RA, g_RS, g_RB):
# Rotate Left Double Word
# rotld RA, RS, RB
# rldcl RA, RS, RB, 0
g_MB = 0
g_ME = 63
return Rotate_iMask64(ea, g_mnem, g_RA, g_RS, g_RB, g_MB, g_ME)
def rldcr(ea, g_mnem, g_RA, g_RS, g_RB, g_ME):
# Rotate Left Double Word then Clear Right
# rldcr RA, RS, RB, ME
g_MB = 0
return Rotate_iMask64(ea, g_mnem, g_RA, g_RS, g_RB, g_MB, g_ME)
def rldic(ea, g_mnem, g_RA, g_RS, g_SH, g_MB):
# Rotate Left Double Word Immediate then Clear
# rldic RA, RS, SH, MB
g_ME = 63 - g_SH
return iRotate_iMask64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def rldicl(ea, g_mnem, g_RA, g_RS, g_SH, g_MB):
# Rotate Left Double Word Immediate then Clear Left
# rldicl RA, RS, SH, MB
g_ME = 63
if (simplify64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME) == 1):
return 1
if(search_for_matching_opcode_backwards(ea, "rldicl", g_RA, g_RS, g_SH) == 1):
return 1
return iRotate_iMask64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def rldicr(ea, g_mnem, g_RA, g_RS, g_SH, g_ME):
# Rotate Left Double Word Immediate then Clear Right
# rldicr RA, RS, SH, ME
g_MB = 0
return iRotate_iMask64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def rldimi(ea, g_mnem, g_RA, g_RS, g_SH, g_MB):
# Rotate Left Double Word Immediate then Mask Insert
# rldimi RA, RS, SH, MB
g_ME = 63 - g_SH
return insert_iRotate_iMask64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def rlwimi(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME):
# Rotate Left Word Immediate Then Mask Insert
# rlwimi RA, RS, SH, MB, ME
return insert_iRotate_iMask32(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def slwi(ea, g_mnem, g_RA, g_RS, n):
# Shift left immediate
# slwi RA, RS, n
# rlwinm RA, RS, n, 0, 31-n
g_SH = n
g_MB = 0
g_ME = 31-n
return iRotate_iMask32(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def srwi(ea, g_mnem, g_RA, g_RS, n):
# Shift right immediate
# srwi RA, RS, n
# rlwinm RA, RS, 32-n, n, 31
g_SH = 32-n
g_MB = n
g_ME = 31
return iRotate_iMask32(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def sldi(ea, g_mnem, g_RA, g_RS, n):
# Shift left double word immediate
# sldi RA, RS, n
# rldicr RA, RS, n, 63 - n
g_SH = n
g_MB = 0
g_ME = 63-n
if (simplify64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME) == 1):
return 1
return iRotate_iMask64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def srdi(ea, g_mnem, g_RA, g_RS, n):
# Shift right double word immediate
# srdi RA, RS, n
# rldicl RA, RS, 64 - n, n
g_SH = 64-n
g_MB = n
g_ME = 63
return iRotate_iMask64(ea, g_mnem, g_RA, g_RS, g_SH, g_MB, g_ME)
def mfocrf(ea, g_mnem, g_RT, g_FXM):
# Move from One Condition Register Field
# mfocrf RT, FXM
#FXM is passed as str
g_FXM = int(g_FXM, 16)
if ida_ida.inf_get_procname() != "ppcl":
if g_FXM & 0x01 != 0:
string = " = cr7 & 0x0000000F\nbit28 = LT, bit29 = GT, bit30 = EQ, bit31 = SO"
elif g_FXM & 0x02 != 0:
string = " = (cr6 << 4) & 0x000000F0\nbit24 = LT, bit25 = GT, bit26 = EQ, bit27 = SO"
elif g_FXM & 0x04 != 0:
string = " = (cr5 << 8) & 0x00000F00\nbit20 = LT, bit21 = GT, bit22 = EQ, bit23 = SO"
elif g_FXM & 0x08 != 0:
string = " = (cr4 << 12) & 0x0000F000\nbit16 = LT, bit17 = GT, bit18 = EQ, bit19 = SO"
elif g_FXM & 0x10 != 0:
string = " = (cr3 << 16) & 0x000F0000\nbit12 = LT, bit13 = GT, bit14 = EQ, bit15 = SO"
elif g_FXM & 0x20 != 0:
string = " = (cr2 << 20) & 0x00F00000\nbit8 = LT, bit9 = GT, bit10 = EQ, bit11 = SO"
elif g_FXM & 0x40 != 0:
string = " = (cr1 << 24) & 0x0F000000\nbit4 = LT, bit5 = GT, bit6 = EQ, bit7 = SO"
elif g_FXM & 0x80 != 0:
string = " = (cr0 << 28) & 0xF0000000\nbit0 = LT, bit1 = GT, bit2 = EQ, bit3 = SO"
else:
return 0
return ".\n" + g_RT + string
#LE new impl
#if g_FXM & 0x01 != 0:
# string = " = (cr7 << 28) & 0xF0000000\nbit0 = LT, bit1 = GT, bit2 = EQ, bit3 = SO"
#elif g_FXM & 0x02 != 0:
# string = " = (cr6 << 24) & 0x0F000000\nbit4 = LT, bit5 = GT, bit6 = EQ, bit7 = SO"
#elif g_FXM & 0x04 != 0:
# string = " = (cr5 << 20) & 0x00F00000\nbit8 = LT, bit9 = GT, bit10 = EQ, bit11 = SO"
#elif g_FXM & 0x08 != 0:
# string = " = (cr4 << 16) & 0x000F0000\nbit12 = LT, bit13 = GT, bit14 = EQ, bit15 = SO"
#elif g_FXM & 0x10 != 0:
# string = " = (cr3 << 12) & 0x0000F000\nbit16 = LT, bit17 = GT, bit18 = EQ, bit19 = SO"
#elif g_FXM & 0x20 != 0:
# string = " = (cr2 << 8) & 0x00000F00\nbit20 = LT, bit21 = GT, bit22 = EQ, bit23 = SO"
#elif g_FXM & 0x40 != 0:
# string = " = (cr1 << 4) & 0x000000F0\nbit24 = LT, bit25 = GT, bit26 = EQ, bit27 = SO"
#elif g_FXM & 0x80 != 0:
# string = " = cr0 & 0x0000000F\nbit28 = LT, bit29 = GT, bit30 = EQ, bit31 = SO"
#else:
# return 0
def mfcr(ea, g_mnem, g_RT):
string = ".\n"
string += "cr7 bit28 = LT, bit29 = GT, bit30 = EQ, bit31 = SO\n"
string += "cr6 bit24 = LT, bit25 = GT, bit26 = EQ, bit27 = SO\n"
string += "cr5 bit20 = LT, bit21 = GT, bit22 = EQ, bit23 = SO\n"
string += "cr4 bit16 = LT, bit17 = GT, bit18 = EQ, bit19 = SO\n"
string += "cr3 bit12 = LT, bit13 = GT, bit14 = EQ, bit15 = SO\n"
string += "cr2 bit8 = LT, bit9 = GT, bit10 = EQ, bit11 = SO\n"
string += "cr1 bit4 = LT, bit5 = GT, bit6 = EQ, bit7 = SO\n"
string += "cr0 bit0 = LT, bit1 = GT, bit2 = EQ, bit3 = SO\n"
return string
# try to do as much work in this function as possible in order to
# simplify each "instruction" handling function
def PPCAsm2C(ea):
# make sure address is valid and that it points to the start of an instruction
if(ea == BADADDR):
return False
if(is_code(ida_bytes.get_flags(ea)) == 0):
return False
# get instruction mnemonic
g_mnem = print_insn_mnem(ea)
if(g_mnem == 0):
return False
# Remove record bit if exist,
# we need to do this before testing for opcode validity.
dot = "."
dot = g_mnem.find(dot)
if(dot != -1):
g_mnem = g_mnem[0:dot]
is_ok = False
accepted = ["clrlwi", "clrldi", "clrrwi", "clrrdi", "clrlslwi", "clrlsldi",
"extlwi", "extldi", "extrwi", "extrdi", "inslwi", "insrwi", "insrdi",
"rlwinm", "rlwnm", "rotlw", "rotlwi", "rotrwi", "rotldi", "rotld", "rotrdi", "slwi", "srwi", "sldi",
"srdi", "rldcr", "rldic", "rldicl", "rldicr", "rldimi", "rlwimi", "mfocrf", "mfcr"]
for x in accepted:
if (g_mnem == x):
is_ok = True
break
if (is_ok == False):
return False
# get instruction operand strings
# IDA only natively supports 3 operands