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/* PLT trampolines. x86-64 version.
Copyright (C) 2004, 2005, 2007, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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 for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
.text
.globl _dl_runtime_resolve
.type _dl_runtime_resolve, @function
.align 16
cfi_startproc
_dl_runtime_resolve:
subq $56,%rsp
cfi_adjust_cfa_offset(72) # Incorporate PLT
movq %rax,(%rsp) # Preserve registers otherwise clobbered.
movq %rcx, 8(%rsp)
movq %rdx, 16(%rsp)
movq %rsi, 24(%rsp)
movq %rdi, 32(%rsp)
movq %r8, 40(%rsp)
movq %r9, 48(%rsp)
movq 64(%rsp), %rsi # Copy args pushed by PLT in register.
movq 56(%rsp), %rdi # %rdi: link_map, %rsi: reloc_offset
call _dl_fixup # Call resolver.
movq %rax, %r11 # Save return value
movq 48(%rsp), %r9 # Get register content back.
movq 40(%rsp), %r8
movq 32(%rsp), %rdi
movq 24(%rsp), %rsi
movq 16(%rsp), %rdx
movq 8(%rsp), %rcx
movq (%rsp), %rax
addq $72, %rsp # Adjust stack(PLT did 2 pushes)
cfi_adjust_cfa_offset(-72)
jmp *%r11 # Jump to function address.
cfi_endproc
.size _dl_runtime_resolve, .-_dl_runtime_resolve
#ifndef PROF
.globl _dl_runtime_profile
.type _dl_runtime_profile, @function
.align 16
cfi_startproc
_dl_runtime_profile:
/* The La_x86_64_regs data structure pointed to by the
fourth paramater must be 16-byte aligned. This must
be explicitly enforced. We have the set up a dynamically
sized stack frame. %rbx points to the top half which
has a fixed size and preserves the original stack pointer. */
subq $32, %rsp # Allocate the local storage.
cfi_adjust_cfa_offset(48) # Incorporate PLT
movq %rbx, (%rsp)
cfi_rel_offset(%rbx, 0)
/* On the stack:
56(%rbx) parameter #1
48(%rbx) return address
40(%rbx) reloc index
32(%rbx) link_map
24(%rbx) La_x86_64_regs pointer
16(%rbx) framesize
8(%rbx) rax
(%rbx) rbx
*/
movq %rax, 8(%rsp)
movq %rsp, %rbx
cfi_def_cfa_register(%rbx)
/* Actively align the La_x86_64_regs structure. */
andq $0xfffffffffffffff0, %rsp
subq $192, %rsp # sizeof(La_x86_64_regs)
movq %rsp, 24(%rbx)
movq %rdx, (%rsp) # Fill the La_x86_64_regs structure.
movq %r8, 8(%rsp)
movq %r9, 16(%rsp)
movq %rcx, 24(%rsp)
movq %rsi, 32(%rsp)
movq %rdi, 40(%rsp)
movq %rbp, 48(%rsp)
leaq 48(%rbx), %rax
movq %rax, 56(%rsp)
movaps %xmm0, 64(%rsp)
movaps %xmm1, 80(%rsp)
movaps %xmm2, 96(%rsp)
movaps %xmm3, 112(%rsp)
movaps %xmm4, 128(%rsp)
movaps %xmm5, 144(%rsp)
movaps %xmm7, 160(%rsp)
movq %rsp, %rcx # La_x86_64_regs pointer to %rcx.
movq 48(%rbx), %rdx # Load return address if needed.
movq 40(%rbx), %rsi # Copy args pushed by PLT in register.
movq 32(%rbx), %rdi # %rdi: link_map, %rsi: reloc_offset
leaq 16(%rbx), %r8
call _dl_profile_fixup # Call resolver.
movq %rax, %r11 # Save return value.
movq 8(%rbx), %rax # Get back register content.
movq (%rsp), %rdx
movq 8(%rsp), %r8
movq 16(%rsp), %r9
movaps 64(%rsp), %xmm0
movaps 80(%rsp), %xmm1
movaps 96(%rsp), %xmm2
movaps 112(%rsp), %xmm3
movaps 128(%rsp), %xmm4
movaps 144(%rsp), %xmm5
movaps 160(%rsp), %xmm7
movq 16(%rbx), %r10 # Anything in framesize?
testq %r10, %r10
jns 1f
/* There's nothing in the frame size, so there
will be no call to the _dl_call_pltexit. */
movq 24(%rsp), %rcx # Get back registers content.
movq 32(%rsp), %rsi
movq 40(%rsp), %rdi
movq %rbx, %rsp
movq (%rsp), %rbx
cfi_restore(rbx)
cfi_def_cfa_register(%rsp)
addq $48, %rsp # Adjust the stack to the return value
# (eats the reloc index and link_map)
cfi_adjust_cfa_offset(-48)
jmp *%r11 # Jump to function address.
1:
cfi_adjust_cfa_offset(48)
cfi_rel_offset(%rbx, 0)
cfi_def_cfa_register(%rbx)
/* At this point we need to prepare new stack for the function
which has to be called. We copy the original stack to a
temporary buffer of the size specified by the 'framesize'
returned from _dl_profile_fixup */
leaq 56(%rbx), %rsi # stack
addq $8, %r10
andq $0xfffffffffffffff0, %r10
movq %r10, %rcx
subq %r10, %rsp
movq %rsp, %rdi
shrq $3, %rcx
rep
movsq
movq 24(%rdi), %rcx # Get back register content.
movq 32(%rdi), %rsi
movq 40(%rdi), %rdi
call *%r11
mov 24(%rbx), %rsp # Drop the copied stack content
/* Now we have to prepare the La_x86_64_retval structure for the
_dl_call_pltexit. The La_x86_64_regs is being pointed by rsp now,
so we just need to allocate the sizeof(La_x86_64_retval) space on
the stack, since the alignment has already been taken care of. */
subq $80, %rsp # sizeof(La_x86_64_retval)
movq %rsp, %rcx # La_x86_64_retval argument to %rcx.
movq %rax, (%rcx) # Fill in the La_x86_64_retval structure.
movq %rdx, 8(%rcx)
movaps %xmm0, 16(%rcx)
movaps %xmm1, 32(%rcx)
fstpt 48(%rcx)
fstpt 64(%rcx)
movq 24(%rbx), %rdx # La_x86_64_regs argument to %rdx.
movq 40(%rbx), %rsi # Copy args pushed by PLT in register.
movq 32(%rbx), %rdi # %rdi: link_map, %rsi: reloc_offset
call _dl_call_pltexit
movq (%rsp), %rax # Restore return registers.
movq 8(%rsp), %rdx
movaps 16(%rsp), %xmm0
movaps 32(%rsp), %xmm1
fldt 64(%rsp)
fldt 48(%rsp)
movq %rbx, %rsp
movq (%rsp), %rbx
cfi_restore(rbx)
cfi_def_cfa_register(%rsp)
addq $48, %rsp # Adjust the stack to the return value
# (eats the reloc index and link_map)
cfi_adjust_cfa_offset(-48)
retq
cfi_endproc
.size _dl_runtime_profile, .-_dl_runtime_profile
#endif
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