/*
* 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"
.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:
cmpwi %r3, 0
beq- .LreturnNilMethod
andi. %r0, %r3, 1
bne- .LtaggedPointer_\name
lwz %r5, 0(%r3)
lwz %r5, 32(%r5)
.Lmain_\name:
lwz %r8, 0(%r4)
#ifdef OF_SELUID24
rlwinm %r6, %r8, 18, 0x3FC
#endif
rlwinm %r7, %r8, 26, 0x3FC
rlwinm %r8, %r8, 2, 0x3FC
#ifdef OF_SELUID24
lwzx %r5, %r5, %r6
#endif
lwzx %r5, %r5, %r7
lwzx %r5, %r5, %r8
cmpwi %r5, 0
beq- 0f
mr %r3, %r5
blr
0:
#ifdef OF_PIC
stwu %r1, -16(%r1)
mflr %r0
stw %r0, 20(%r1)
stw %r30, 8(%r1)
bl 0f
0:
mflr %r30
addis %r30, %r30, .Lbiased_got2-0b@ha
addi %r30, %r30, .Lbiased_got2-0b@l
lwz %r0, .Lgot_\notFound-.Lbiased_got2(%r30)
mtctr %r0
lwz %r30, 8(%r1)
lwz %r0, 20(%r1)
addi %r1, %r1, 16
mtlr %r0
bctr
#else
b \notFound
#endif
.LtaggedPointer_\name:
#if defined(OF_PIC)
mflr %r7
bl 0f
0:
mflr %r6
mtlr %r7
addis %r6, %r6, .Lbiased_got2-0b@ha
addi %r6, %r6, .Lbiased_got2-0b@l
lwz %r5, .Lgot_objc_taggedPointerSecret-.Lbiased_got2(%r6)
lwz %r5, 0(%r5)
#elif defined(OF_BASEREL)
addis %r5, %r13, objc_taggedPointerSecret@drel@ha
lwz %r5, objc_taggedPointerSecret@drel@l(%r5)
#else
lis %r5, objc_taggedPointerSecret@ha
lwz %r5, objc_taggedPointerSecret@l(%r5)
#endif
xor %r5, %r3, %r5
rlwinm %r5, %r5, 1, 0x1C
#if defined(OF_PIC)
lwz %r6, .Lgot_objc_taggedPointerClasses-.Lbiased_got2(%r6)
#elif defined(OF_BASEREL)
addis %r6, %r13, objc_taggedPointerClasses@drel@ha
addi %r6, %r6, objc_taggedPointerClasses@drel@l
#else
lis %r6, objc_taggedPointerClasses@ha
addi %r6, %r6, objc_taggedPointerClasses@l
#endif
lwzx %r5, %r6, %r5
lwz %r5, 32(%r5)
b .Lmain_\name
.type \name, @function
.size \name, .-\name
.endm
.macro GENERATE_LOOKUP_SUPER name lookup
\name:
mr %r5, %r3
lwz %r3, 0(%r3)
cmpwi %r3, 0
beq- .LreturnNilMethod
lwz %r5, 4(%r5)
lwz %r5, 32(%r5)
b .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:
mflr %r0
bl .LgetPC
mtlr %r0
0:
addi %r3, %r3, .LnilMethod-0b
blr
.LnilMethod:
li %r3, 0
blr
.LgetPC:
mflr %r3
blr
#ifdef OF_PIC
.section .got2, "aw"
.Lbiased_got2 = .+0x8000
.Lgot_objc_methodNotFound:
.long objc_methodNotFound
.Lgot_objc_methodNotFound_stret:
.long objc_methodNotFound_stret
.Lgot_objc_taggedPointerSecret:
.long objc_taggedPointerSecret
.Lgot_objc_taggedPointerClasses:
.long objc_taggedPointerClasses
#endif
#if defined(OF_LINUX) || defined(OF_HAIKU) || defined(OF_HURD)
.section .note.GNU-stack, "", @progbits
#endif