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/*
* File: bs_x86_64.S
* Date: 26 Mar 2019
* Acct: Sandy Harvie (charvie)
* Desc: Bootstrap routine for x86-64 ELF dynamic linker
*/
#include "asm.h"
.globl _bootstrap
_bootstrap:
movq 8(%rsp), %rdi # Pass argc
movq 16(%rsp), %rsi # Pass argv
movq 24(%rsp), %rdx # Pass envp
movq 32(%rsp), %rcx # Pass auxv
call _ldloadrtld # Dynamic linking!
movq 8(%rsp), %rdi # Pass argc
movq 16(%rsp), %rsi # Pass argv
movq 24(%rsp), %rdx # Pass envp
movq 32(%rsp), %rcx # Pass auxv
call *%rax # Call main
movq %rax, %rdi # Pass return value of main
call _ldcleanup # Clean up and exit
ENTRY(_ld_bind)
pushfq # Save RFLAGS
pushq %rax # Save %rax
pushq %rcx # Save %rcx
pushq %rdx # Save %rdx
pushq %rdi # Save %rdi
pushq %rsi # Save %rsi
pushq %r8 # Save %r8
pushq %r9 # Save %r9
pushq %r10 # Save %r10
pushq %r11 # Save %r11
movq 80(%rsp), %rdi # Copy module argument
movq 88(%rsp), %rsi # Copy reloff argument
call _rtresolve@PLT # Transfer control to binder
movq %rax, 88(%rsp) # Store target over reloff argument
popq %r11 # Restore %r11
popq %r10 # Restore %r10
popq %r9 # Restore %r9
popq %r8 # Restore %r8
popq %rsi # Restore %rsi
popq %rdi # Restore %rdi
popq %rdx # Restore %rdx
popq %rcx # Restore %rcx
popq %rax # Restore %rax
popfq # Restore RFLAGS
leaq 8(%rsp), %rsp # Discard module without changing RFLAGSs
ret # Return to target address
END(_ld_bind)
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