Artifact f683aade072d788a01246e8c8bc2f3a64ad5de0fbea70905c001b82ce3675be7:
- File
src/runtime/lookup-asm/lookup-asm-x86-elf.S
— part of check-in
[3e76fc01af]
at
2024-08-02 10:52:16
on branch trunk
— runtime: Don't overwrite stack arguments on x86
This could be problematic if the compiler expects the stack to be
unchanged. (user: js, size: 2762) [annotate] [blame] [check-ins using] [more...]
/* * 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 subl $16, %esp movl %eax, (%esp) movl 24(%esp), %eax movl %eax, 4(%esp) movl 4(%edx), %edx movl 32(%edx), %edx call .Lmain_\lookup addl $16, %esp ret .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