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Diffstat (limited to 'sysdeps/i386/dl-trampoline.S')
| -rw-r--r-- | sysdeps/i386/dl-trampoline.S | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/sysdeps/i386/dl-trampoline.S b/sysdeps/i386/dl-trampoline.S new file mode 100644 index 0000000000..fd87eb711d --- /dev/null +++ b/sysdeps/i386/dl-trampoline.S @@ -0,0 +1,184 @@ +/* PLT trampolines. i386 version. + Copyright (C) 2004, 2005 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 + cfi_startproc + .align 16 +_dl_runtime_resolve: + cfi_adjust_cfa_offset (8) + pushl %eax # Preserve registers otherwise clobbered. + cfi_adjust_cfa_offset (4) + pushl %ecx + cfi_adjust_cfa_offset (4) + pushl %edx + cfi_adjust_cfa_offset (4) + movl 16(%esp), %edx # Copy args pushed by PLT in register. Note + movl 12(%esp), %eax # that `fixup' takes its parameters in regs. + call _dl_fixup # Call resolver. + popl %edx # Get register content back. + cfi_adjust_cfa_offset (-4) + popl %ecx + cfi_adjust_cfa_offset (-4) + xchgl %eax, (%esp) # Get %eax contents end store function address. + ret $8 # Jump to function address. + cfi_endproc + .size _dl_runtime_resolve, .-_dl_runtime_resolve + + +#ifndef PROF + .globl _dl_runtime_profile + .type _dl_runtime_profile, @function + cfi_startproc + .align 16 +_dl_runtime_profile: + cfi_adjust_cfa_offset (8) + pushl %esp + cfi_adjust_cfa_offset (4) + addl $8, (%esp) # Account for the pushed PLT data + pushl %ebp + cfi_adjust_cfa_offset (4) + pushl %eax # Preserve registers otherwise clobbered. + cfi_adjust_cfa_offset (4) + pushl %ecx + cfi_adjust_cfa_offset (4) + pushl %edx + cfi_adjust_cfa_offset (4) + movl %esp, %ecx + subl $8, %esp + cfi_adjust_cfa_offset (8) + movl $-1, 4(%esp) + leal 4(%esp), %edx + movl %edx, (%esp) + pushl %ecx # Address of the register structure + cfi_adjust_cfa_offset (4) + movl 40(%esp), %ecx # Load return address + movl 36(%esp), %edx # Copy args pushed by PLT in register. Note + movl 32(%esp), %eax # that `fixup' takes its parameters in regs. + call _dl_profile_fixup # Call resolver. + cfi_adjust_cfa_offset (-8) + movl (%esp), %edx + testl %edx, %edx + jns 1f + popl %edx + cfi_adjust_cfa_offset (-4) + popl %edx # Get register content back. + cfi_adjust_cfa_offset (-4) + popl %ecx + cfi_adjust_cfa_offset (-4) + xchgl %eax, (%esp) # Get %eax contents end store function address. + ret $16 # Jump to function address. + + /* + +32 return address + +28 PLT1 + +24 PLT2 + +20 %esp + +16 %ebp + +12 %eax + +8 %ecx + +4 %edx + %esp free + */ + cfi_adjust_cfa_offset (12) +1: movl %ebx, (%esp) + cfi_rel_offset (3, 0) + movl %edx, %ebx # This is the frame buffer size + pushl %edi + cfi_adjust_cfa_offset (4) + cfi_rel_offset (7, 0) + pushl %esi + cfi_adjust_cfa_offset (4) + cfi_rel_offset (6, 0) + leal 44(%esp), %esi + movl %ebx, %ecx + movl %esp, %edi + subl %ebx, %edi + andl $0xfffffff0, %edi # Align stack + movl %esp, %ebx + cfi_def_cfa_register (3) + movl %edi, %esp + shrl $2, %ecx + rep + movsl + movl (%edi), %esi + cfi_restore (6) + movl 4(%edi), %edi + cfi_restore (7) + /* + %ebx+40 return address + %ebx+36 PLT1 + %ebx+32 PLT2 + %ebx+28 %esp + %ebx+24 %ebp + %ebx+20 %eax + %ebx+16 %ecx + %ebx+12 %edx + %ebx+8 %ebx + %ebx+4 free + %ebx free + %esp copied stack frame + */ + movl %eax, (%ebx) + movl 12(%ebx), %edx + movl 16(%ebx), %ecx + movl 20(%ebx), %eax + call *(%ebx) + movl %ebx, %esp + cfi_def_cfa_register (4) + movl 8(%esp), %ebx + cfi_restore (3) + /* + +40 return address + +36 PLT1 + +32 PLT2 + +28 %esp + +24 %ebp + +20 %eax + +16 %ecx + +12 %edx + +8 free + +4 free + %esp free + */ + subl $20, %esp + cfi_adjust_cfa_offset (20) + movl %eax, (%esp) + movl %edx, 4(%esp) + fstpt 8(%esp) + fstpt 20(%esp) + pushl %esp + cfi_adjust_cfa_offset (4) + leal 36(%esp), %ecx + movl 56(%esp), %eax + movl 60(%esp), %edx + call _dl_call_pltexit + movl (%esp), %eax + movl 4(%esp), %edx + fldt 20(%esp) + fldt 8(%esp) + addl $60, %esp + cfi_adjust_cfa_offset (-60) + ret + cfi_endproc + .size _dl_runtime_profile, .-_dl_runtime_profile +#endif |