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