| |
| /*--------------------------------------------------------------------*/ |
| /*--- Trampoline code page stuff. m_trampoline.S ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, a dynamic binary instrumentation |
| framework. |
| |
| Copyright (C) 2000-2005 Julian Seward |
| jseward@acm.org |
| |
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| This program 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 |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307, USA. |
| |
| The GNU General Public License is contained in the file COPYING. |
| */ |
| |
| #include "pub_tool_basics_asm.h" |
| #include "vki_unistd.h" |
| |
| /* ------------------ SIMULATED CPU HELPERS ------------------ */ |
| /* |
| Replacements for some functions to do with vsyscalls and signals. |
| This code runs on the simulated CPU. |
| */ |
| |
| /*---------------- x86-linux ----------------*/ |
| #if defined(VGP_x86_linux) |
| |
| .global VG_(trampoline_stuff_start) |
| VG_(trampoline_stuff_start): |
| |
| .global VG_(x86_linux_SUBST_FOR_sigreturn) |
| VG_(x86_linux_SUBST_FOR_sigreturn): |
| /* This is a very specific sequence which GDB uses to |
| recognize signal handler frames. */ |
| popl %eax |
| movl $__NR_sigreturn, %eax |
| int $0x80 |
| ud2 |
| |
| .global VG_(x86_linux_SUBST_FOR_rt_sigreturn) |
| VG_(x86_linux_SUBST_FOR_rt_sigreturn): |
| /* Likewise for rt signal frames */ |
| movl $__NR_rt_sigreturn, %eax |
| int $0x80 |
| ud2 |
| |
| .global VG_(x86_linux_REDIR_FOR__dl_sysinfo_int80) |
| VG_(x86_linux_REDIR_FOR__dl_sysinfo_int80): |
| /* We can point our sysinfo stuff here */ |
| int $0x80 |
| ret |
| |
| .global VG_(trampoline_stuff_end) |
| VG_(trampoline_stuff_end): |
| |
| |
| /*---------------- amd64-linux ----------------*/ |
| #else |
| #if defined(VGP_amd64_linux) |
| |
| .global VG_(trampoline_stuff_start) |
| VG_(trampoline_stuff_start): |
| |
| .global VG_(amd64_linux_SUBST_FOR_rt_sigreturn) |
| VG_(amd64_linux_SUBST_FOR_rt_sigreturn): |
| /* This is a very specific sequence which GDB uses to |
| recognize signal handler frames. */ |
| movq $__NR_rt_sigreturn, %rax |
| syscall |
| ud2 |
| |
| .global VG_(amd64_linux_REDIR_FOR_vgettimeofday) |
| VG_(amd64_linux_REDIR_FOR_vgettimeofday): |
| movq $__NR_gettimeofday, %rax |
| syscall |
| ret |
| |
| .global VG_(amd64_linux_REDIR_FOR_vtime) |
| VG_(amd64_linux_REDIR_FOR_vtime): |
| movq $__NR_time, %rax |
| syscall |
| ret |
| |
| .global VG_(trampoline_stuff_end) |
| VG_(trampoline_stuff_end): |
| |
| |
| /*---------------- ppc32-linux ----------------*/ |
| #else |
| #if defined(VGP_ppc32_linux) |
| |
| .global VG_(trampoline_stuff_start) |
| VG_(trampoline_stuff_start): |
| |
| /* There's no particular reason that this needs to be handwritten |
| assembly, but since that's what this file contains, here's a |
| simple strlen implementation (written in C and compiled by gcc.) |
| */ |
| .global VG_(ppc32_linux_REDIR_FOR_strlen) |
| VG_(ppc32_linux_REDIR_FOR_strlen): |
| lbz 4,0(3) |
| li 9,0 |
| cmpwi 0,4,0 |
| beq- 0,.L8 |
| .L9: |
| lbzu 5,1(3) |
| addi 9,9,1 |
| cmpwi 0,5,0 |
| bne+ 0,.L9 |
| .L8: |
| mr 3,9 |
| blr |
| |
| .global VG_(trampoline_stuff_end) |
| VG_(trampoline_stuff_end): |
| |
| |
| /*---------------- unknown ----------------*/ |
| #else |
| # error Unknown platform |
| |
| #endif |
| #endif |
| #endif |
| |
| |
| /* Let the linker know we don't need an executable stack */ |
| .section .note.GNU-stack,"",@progbits |
| |
| /*--------------------------------------------------------------------*/ |
| /*--- end ---*/ |
| /*--------------------------------------------------------------------*/ |