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# Copyright (C) 2018-2020 Apple Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
# OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
class ARM64E
# FIXME: This is fragile and needs to match the enum value in PtrTag.h.
CFunctionPtrTag = 2
end
class Sequence
def getModifiedListARM64E
result = riscLowerMisplacedAddresses(@list)
getModifiedListARM64Common(result)
end
end
class Instruction
def self.lowerMisplacedAddressesARM64E(node, newList)
wasHandled = false
if node.is_a? Instruction
postInstructions = []
annotation = node.annotation
codeOrigin = node.codeOrigin
case node.opcode
when "jmp", "call"
if node.operands.size == 3
raise unless node.operands[2].value == 1
raise unless node.operands[1].immediate? and node.operands[1].value <= 0xffff
raise unless node.operands[0].address?
address = Tmp.new(codeOrigin, :gpr)
target = Tmp.new(codeOrigin, :gpr)
newList << Instruction.new(codeOrigin, "leap", [node.operands[0], address], annotation)
newList << Instruction.new(codeOrigin, "loadp", [Address.new(codeOrigin, address, Immediate.new(codeOrigin, 0)), target], annotation)
tag = Tmp.new(codeOrigin, :gpr)
newList << Instruction.new(codeOrigin, "move", [Immediate.new(codeOrigin, node.operands[1].value << 48), tag], annotation)
newList << Instruction.new(codeOrigin, "xorp", [address, tag], annotation)
newList << node.cloneWithNewOperands([target, tag])
wasHandled = true
elsif node.operands.size > 1
if node.operands[1].is_a? RegisterID or node.operands[1].is_a? Tmp
tag = riscLowerOperandToRegister(node, newList, postInstructions, 1, "p", false)
else
tag = Tmp.new(codeOrigin, :gpr)
newList << Instruction.new(codeOrigin, "move", [node.operands[1], tag], annotation)
end
operands = [
riscLowerOperandToRegister(node, newList, postInstructions, 0, "p", false),
tag
]
newList << node.cloneWithNewOperands(operands)
wasHandled = true
end
when "tagCodePtr"
raise if node.operands.size < 1 or not node.operands[0].is_a? RegisterID
if node.operands.size == 4
raise unless node.operands[3].register?
raise unless node.operands[2].immediate? and node.operands[2].value == 1
raise unless node.operands[1].immediate? and node.operands[1].value <= 0xffff
address = node.operands[3]
if node.operands[1].immediate?
tag = Tmp.new(codeOrigin, :gpr)
newList << Instruction.new(codeOrigin, "move", [Immediate.new(codeOrigin, node.operands[1].value << 48), tag], annotation)
elsif operands[1].register?
tag = node.operands[1]
end
newList << Instruction.new(codeOrigin, "xorp", [address, tag], annotation)
newList << node.cloneWithNewOperands([node.operands[0], tag])
wasHandled = true
end
when "untagArrayPtr"
newOperands = node.operands.map {
| operand |
if operand.address?
tmp = Tmp.new(codeOrigin, :gpr)
newList << Instruction.new(codeOrigin, "loadp", [operand, tmp], annotation)
tmp
else
operand
end
}
newList << node.cloneWithNewOperands(newOperands)
wasHandled = true
end
newList += postInstructions if wasHandled
end
return wasHandled, newList
end
def lowerARM64E
case opcode
when "call"
if operands.size == 1 or operands[0].label?
lowerARM64
elsif operands[1] == ARM64E::CFunctionPtrTag
emitARM64Unflipped("blraaz", [operands[0]], :ptr)
else
emitARM64Unflipped("blrab", operands, :ptr)
end
when "jmp"
if operands[0].label?
lowerARM64
else
emitARM64Unflipped("brab", operands, :ptr)
end
when "tagCodePtr"
raise if operands.size > 2
raise unless operands[0].register?
raise unless operands[1].register?
emitARM64Unflipped("pacib", operands, :ptr)
when "tagReturnAddress"
raise if operands.size < 1 or not operands[0].is_a? RegisterID
if operands[0].is_a? RegisterID and operands[0].name == "sp"
$asm.puts "pacibsp"
else
emitARM64Unflipped("pacib lr,", operands, :ptr)
end
when "untagReturnAddress"
raise if operands.size < 1 or not operands[0].is_a? RegisterID
if operands[0].is_a? RegisterID and operands[0].name == "sp"
$asm.puts "autibsp"
else
emitARM64Unflipped("autib lr,", operands, :ptr)
end
when "removeCodePtrTag"
raise unless operands[0].is_a? RegisterID
emitARM64Unflipped("xpaci ", operands, :ptr)
when "untagArrayPtr"
raise if operands.size != 2 or not operands.each { |operand| operand.is_a? RegisterID or operand.is_a? Tmp }
emitARM64("autdb ", operands, :ptr)
when "removeArrayPtrTag"
raise unless operands[0].is_a? RegisterID
emitARM64Unflipped("xpacd ", operands, :ptr)
when "ret"
$asm.puts "retab"
else
lowerARM64
end
end
end
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