mirror of
https://github.com/RGBCube/serenity
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54 lines
1.1 KiB
ArmAsm
54 lines
1.1 KiB
ArmAsm
/*
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* Copyright (c) 2021, Gunnar Beutner <gbeutner@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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.align 4
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.globl _plt_trampoline
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.hidden _plt_trampoline
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.type _plt_trampoline,@function
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_plt_trampoline: # (object, relocation_index)
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# save flags/registers (https://stackoverflow.com/questions/18024672/what-registers-are-preserved-through-a-linux-x86-64-function-call)
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pushfq
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pushq %rax
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pushq %rcx
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pushq %rdx
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pushq %rsi
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pushq %rdi
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pushq %r8
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pushq %r9
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pushq %r10
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pushq %r11
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movq 80(%rsp), %rdi # object
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movq 88(%rsp), %rsi # relocation_index
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# offset = index * sizeof(Elf64_Rela)
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shlq $3, %rsi
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leaq (%rsi, %rsi, 2), %rsi
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pushq %rbp
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movq %rsp, %rbp
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andq $~15, %rsp
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call _fixup_plt_entry@PLT
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movq %rbp, %rsp
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popq %rbp
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movq %rax, 88(%rsp) # replace object argument with symbol address
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# restore flags/registers
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popq %r11
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popq %r10
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popq %r9
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popq %r8
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popq %rdi
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popq %rsi
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popq %rdx
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popq %rcx
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popq %rax
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popfq
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addq $8, %rsp # remove relocation_index argument
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retq
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