/*
* 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"
#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
testq %rcx, %rcx
jz .LreturnNilMethod
testb $1, %cl
jnz .LtaggedPointer_\name
movq (%rcx), %r8
movq 56(%r8), %r8
.Lmain_\name:
movq %rcx, %r10
movq %rdx, %r11
movq (%rdx), %rax
movzbl %ah, %ecx
movzbl %al, %edx
#ifdef OF_SELUID24
shrl $16, %eax
movq (%r8,%rax,8), %r8
#endif
movq (%r8,%rcx,8), %r8
movq (%r8,%rdx,8), %rax
testq %rax, %rax
jz 0f
ret
0:
movq %r10, %rcx
movq %r11, %rdx
jmp \notFound
.LtaggedPointer_\name:
xorq objc_taggedPointerSecret(%rip), %rcx
andb $0xE, %cl
movzbl %cl, %r8d
leaq objc_taggedPointerClasses(%rip), %rax
movq (%rax,%r8,4), %r8
movq 56(%r8), %r8
jmp .Lmain_\name
.def \name
.scl 2
.type 32
.endef
.endm
.macro GENERATE_LOOKUP_SUPER name lookup
\name:
_CET_ENDBR
movq %rcx, %r8
movq (%rcx), %rcx
testq %rcx, %rcx
jz .LreturnNilMethod
movq 8(%r8), %r8
movq 56(%r8), %r8
jmp .Lmain_\lookup
.def \name
.scl 2
.type 32
.endef
.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:
leaq .LnilMethod(%rip), %rax
ret
.LnilMethod:
_CET_ENDBR
xorq %rax, %rax
ret