/*
* Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3.0 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* version 3.0 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3.0 along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "platform.h"
#ifdef HAVE_CET_H
# include <cet.h>
#else
# define _CET_ENDBR
#endif
.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 notFound
\name:
_CET_ENDBR
movl 4(%esp), %edx
testl %edx, %edx
jz .LreturnNilMethod
testb $1, %dl
jnz .LtaggedPointer_\name
movl (%edx), %edx
movl 32(%edx), %edx
.Lmain_\name:
movl 8(%esp), %eax
#ifdef OF_SELUID24
movzbl 2(%eax), %ecx
movl (%edx,%ecx,4), %edx
#endif
movzbl 1(%eax), %ecx
movl (%edx,%ecx,4), %edx
movzbl (%eax), %ecx
movl (%edx,%ecx,4), %eax
testl %eax, %eax
jz 0f
ret
0:
call .LgetEIP
addl $_GLOBAL_OFFSET_TABLE_, %eax
movl \notFound@GOT(%eax), %eax
jmp *%eax
.LtaggedPointer_\name:
call .LgetEIP
addl $_GLOBAL_OFFSET_TABLE_, %eax
movl objc_taggedPointerSecret@GOT(%eax), %ecx
xorl (%ecx), %edx
andb $0xE, %dl
movzbl %dl, %edx
movl objc_taggedPointerClasses@GOT(%eax), %eax
movl (%eax,%edx,2), %edx
movl 32(%edx), %edx
jmp .Lmain_\name
.type \name, %function
.size \name, .-\name
.endm
.macro GENERATE_LOOKUP_SUPER name lookup
\name:
_CET_ENDBR
movl 4(%esp), %edx
movl (%edx), %eax
testl %eax, %eax
jz .LreturnNilMethod
movl %eax, 4(%esp)
mov 4(%edx), %edx
mov 32(%edx), %edx
jmp .Lmain_\lookup
.type \name, %function
.size \name, .-\name
.endm
GENERATE_LOOKUP objc_msg_lookup objc_methodNotFound
GENERATE_LOOKUP objc_msg_lookup_stret objc_methodNotFound_stret
GENERATE_LOOKUP_SUPER objc_msg_lookup_super objc_msg_lookup
GENERATE_LOOKUP_SUPER objc_msg_lookup_super_stret objc_msg_lookup_stret
.LreturnNilMethod:
call .LgetEIP
addl $_GLOBAL_OFFSET_TABLE_, %eax
leal .LnilMethod@GOTOFF(%eax), %eax
ret
.LnilMethod:
_CET_ENDBR
xorl %eax, %eax
ret
.LgetEIP:
movl (%esp), %eax
ret
#if defined(OF_LINUX) || defined(OF_HAIKU) || defined(OF_HURD)
.section .note.GNU-stack, "", %progbits
#endif