/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
* 2018, 2019, 2020
* Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#include "config.h"
#include "platform.h"
.intel_syntax noprefix
.globl objc_msg_lookup
.globl objc_msg_lookup_stret
.globl objc_msg_lookup_super
.globl objc_msg_lookup_super_stret
.section .text
.macro generate_lookup name not_found
\name:
mov edx, [esp+4]
test edx, edx
jz short ret_nil
bt edx, 0
jc short .Ltagged_pointer_\name
mov edx, [edx]
mov edx, [edx+32]
.Lmain_\name:
mov eax, [esp+8]
#ifdef OF_SELUID24
movzx ecx, byte ptr [eax+2]
mov edx, [edx+ecx*4]
#endif
movzx ecx, byte ptr [eax+1]
mov edx, [edx+ecx*4]
movzx ecx, byte ptr [eax]
mov eax, [edx+ecx*4]
test eax, eax
jz short 0f
ret
0:
call get_eip
add eax, offset _GLOBAL_OFFSET_TABLE_
lea eax, [eax+\not_found@GOTOFF]
jmp eax
.Ltagged_pointer_\name:
call get_eip
add eax, offset _GLOBAL_OFFSET_TABLE_
lea ecx, [eax+objc_tagged_pointer_secret@GOTOFF]
xor edx, [ecx]
and dl, 0xE
movzx edx, dl
lea eax, [eax+objc_tagged_pointer_classes@GOTOFF]
mov edx, [eax+edx*2]
mov edx, [edx+32]
jmp short .Lmain_\name
.type \name, %function
.size \name, .-\name
.endm
.macro generate_lookup_super name lookup
\name:
mov edx, [esp+4]
mov eax, [edx]
test eax, eax
jz short ret_nil
mov [esp+4], eax
mov edx, [edx+4]
mov edx, [edx+32]
jmp short .Lmain_\lookup
.type \name, %function
.size \name, .-\name
.endm
generate_lookup objc_msg_lookup objc_method_not_found
generate_lookup objc_msg_lookup_stret objc_method_not_found_stret
generate_lookup_super objc_msg_lookup_super objc_msg_lookup
generate_lookup_super objc_msg_lookup_super_stret objc_msg_lookup_stret
ret_nil:
call get_eip
add eax, offset _GLOBAL_OFFSET_TABLE_
lea eax, [eax+nil_method@GOTOFF]
ret
nil_method:
xor eax, eax
ret
get_eip:
mov eax, [esp]
ret
#ifdef OF_LINUX
.section .note.GNU-stack, "", %progbits
#endif