216 lines
5.5 KiB
ArmAsm
216 lines
5.5 KiB
ArmAsm
/* PLT trampolines. i386 version.
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Copyright (C) 2004-2015 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, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <link-defines.h>
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#ifdef HAVE_MPX_SUPPORT
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# define PRESERVE_BND_REGS_PREFIX bnd
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#else
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# define PRESERVE_BND_REGS_PREFIX .byte 0xf2
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#endif
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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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cfi_startproc
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.align 16
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_dl_runtime_resolve:
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cfi_adjust_cfa_offset (8)
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pushl %eax # Preserve registers otherwise clobbered.
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cfi_adjust_cfa_offset (4)
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pushl %ecx
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cfi_adjust_cfa_offset (4)
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pushl %edx
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cfi_adjust_cfa_offset (4)
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movl 16(%esp), %edx # Copy args pushed by PLT in register. Note
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movl 12(%esp), %eax # that `fixup' takes its parameters in regs.
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call _dl_fixup # Call resolver.
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popl %edx # Get register content back.
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cfi_adjust_cfa_offset (-4)
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movl (%esp), %ecx
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movl %eax, (%esp) # Store the function address.
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movl 4(%esp), %eax
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ret $12 # 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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cfi_startproc
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.align 16
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_dl_runtime_profile:
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cfi_adjust_cfa_offset (8)
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pushl %esp
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cfi_adjust_cfa_offset (4)
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addl $8, (%esp) # Account for the pushed PLT data
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pushl %ebp
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cfi_adjust_cfa_offset (4)
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pushl %eax # Preserve registers otherwise clobbered.
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cfi_adjust_cfa_offset (4)
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pushl %ecx
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cfi_adjust_cfa_offset (4)
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pushl %edx
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cfi_adjust_cfa_offset (4)
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movl %esp, %ecx
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subl $8, %esp
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cfi_adjust_cfa_offset (8)
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movl $-1, 4(%esp)
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leal 4(%esp), %edx
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movl %edx, (%esp)
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pushl %ecx # Address of the register structure
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cfi_adjust_cfa_offset (4)
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movl 40(%esp), %ecx # Load return address
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movl 36(%esp), %edx # Copy args pushed by PLT in register. Note
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movl 32(%esp), %eax # that `fixup' takes its parameters in regs.
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call _dl_profile_fixup # Call resolver.
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cfi_adjust_cfa_offset (-8)
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movl (%esp), %edx
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testl %edx, %edx
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jns 1f
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popl %edx
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cfi_adjust_cfa_offset (-4)
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popl %edx # Get register content back.
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cfi_adjust_cfa_offset (-4)
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movl (%esp), %ecx
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movl %eax, (%esp) # Store the function address.
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movl 4(%esp), %eax
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ret $20 # Jump to function address.
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/*
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+32 return address
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+28 PLT1
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+24 PLT2
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+20 %esp
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+16 %ebp
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+12 %eax
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+8 %ecx
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+4 %edx
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%esp free
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*/
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cfi_adjust_cfa_offset (8)
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1: movl %ebx, (%esp)
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cfi_rel_offset (ebx, 0)
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movl %edx, %ebx # This is the frame buffer size
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pushl %edi
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (edi, 0)
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pushl %esi
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (esi, 0)
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leal 44(%esp), %esi
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movl %ebx, %ecx
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orl $4, %ebx # Increase frame size if necessary to align
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# stack for the function call
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andl $~3, %ebx
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movl %esp, %edi
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subl %ebx, %edi
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movl %esp, %ebx
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cfi_def_cfa_register (ebx)
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movl %edi, %esp
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shrl $2, %ecx
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rep
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movsl
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movl (%ebx), %esi
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cfi_restore (esi)
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movl 4(%ebx), %edi
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cfi_restore (edi)
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/*
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%ebx+40 return address
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%ebx+36 PLT1
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%ebx+32 PLT2
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%ebx+28 %esp
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%ebx+24 %ebp
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%ebx+20 %eax
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%ebx+16 %ecx
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%ebx+12 %edx
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%ebx+8 %ebx
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%ebx+4 free
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%ebx free
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%esp copied stack frame
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*/
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movl %eax, (%ebx)
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movl 12(%ebx), %edx
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movl 16(%ebx), %ecx
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movl 20(%ebx), %eax
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call *(%ebx)
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movl %ebx, %esp
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cfi_def_cfa_register (esp)
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movl 8(%esp), %ebx
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cfi_restore (ebx)
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/*
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+40 return address
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+36 PLT1
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+32 PLT2
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+28 %esp
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+24 %ebp
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+20 %eax
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+16 %ecx
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+12 %edx
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+8 free
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+4 free
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%esp free
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*/
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#if LONG_DOUBLE_SIZE != 12
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# error "long double size must be 12 bytes"
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#endif
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# Allocate space for La_i86_retval and subtract 12 free bytes.
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subl $(LRV_SIZE - 12), %esp
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cfi_adjust_cfa_offset (LRV_SIZE - 12)
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movl %eax, LRV_EAX_OFFSET(%esp)
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movl %edx, LRV_EDX_OFFSET(%esp)
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fstpt LRV_ST0_OFFSET(%esp)
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fstpt LRV_ST1_OFFSET(%esp)
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#ifdef HAVE_MPX_SUPPORT
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bndmov %bnd0, LRV_BND0_OFFSET(%esp)
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bndmov %bnd1, LRV_BND1_OFFSET(%esp)
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#else
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.byte 0x66,0x0f,0x1b,0x44,0x24,LRV_BND0_OFFSET
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.byte 0x66,0x0f,0x1b,0x4c,0x24,LRV_BND1_OFFSET
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#endif
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pushl %esp
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cfi_adjust_cfa_offset (4)
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# Address of La_i86_regs area.
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leal (LRV_SIZE + 4)(%esp), %ecx
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# PLT2
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movl (LRV_SIZE + 4 + LR_SIZE)(%esp), %eax
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# PLT1
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movl (LRV_SIZE + 4 + LR_SIZE + 4)(%esp), %edx
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call _dl_call_pltexit
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movl LRV_EAX_OFFSET(%esp), %eax
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movl LRV_EDX_OFFSET(%esp), %edx
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fldt LRV_ST1_OFFSET(%esp)
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fldt LRV_ST0_OFFSET(%esp)
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#ifdef HAVE_MPX_SUPPORT
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bndmov LRV_BND0_OFFSET(%esp), %bnd0
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bndmov LRV_BND1_OFFSET(%esp), %bnd1
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#else
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.byte 0x66,0x0f,0x1a,0x44,0x24,LRV_BND0_OFFSET
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.byte 0x66,0x0f,0x1a,0x4c,0x24,LRV_BND1_OFFSET
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#endif
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# Restore stack before return.
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addl $(LRV_SIZE + 4 + LR_SIZE + 4), %esp
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cfi_adjust_cfa_offset (-(LRV_SIZE + 4 + LR_SIZE + 4))
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PRESERVE_BND_REGS_PREFIX
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ret
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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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