mirror of
https://github.com/Zenithsiz/ftmemsim-valgrind.git
synced 2026-02-09 05:10:23 +00:00
e0a5f54cf9
programs crash before reaching main. I don't know why. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@4819
196 lines
5.4 KiB
ArmAsm
196 lines
5.4 KiB
ArmAsm
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/*--------------------------------------------------------------------*/
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/*--- Trampoline code page stuff. m_trampoline.S ---*/
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/*--------------------------------------------------------------------*/
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/*
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This file is part of Valgrind, a dynamic binary instrumentation
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framework.
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Copyright (C) 2000-2005 Julian Seward
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jseward@acm.org
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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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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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307, USA.
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The GNU General Public License is contained in the file COPYING.
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*/
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#include "pub_core_basics_asm.h"
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#include "vki_unistd.h"
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/* ------------------ SIMULATED CPU HELPERS ------------------ */
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/*
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Replacements for some functions to do with vsyscalls and signals.
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This code runs on the simulated CPU.
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*/
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/*---------------------- x86-linux ----------------------*/
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#if defined(VGP_x86_linux)
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# define UD2_16 ud2 ; ud2 ; ud2 ; ud2 ;ud2 ; ud2 ; ud2 ; ud2
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# define UD2_64 UD2_16 ; UD2_16 ; UD2_16 ; UD2_16
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# define UD2_256 UD2_64 ; UD2_64 ; UD2_64 ; UD2_64
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# define UD2_1024 UD2_256 ; UD2_256 ; UD2_256 ; UD2_256
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# define UD2_PAGE UD2_1024 ; UD2_1024 ; UD2_1024 ; UD2_1024
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/* a leading page of unexecutable code */
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UD2_PAGE
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.global VG_(trampoline_stuff_start)
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VG_(trampoline_stuff_start):
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.global VG_(x86_linux_SUBST_FOR_sigreturn)
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VG_(x86_linux_SUBST_FOR_sigreturn):
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/* This is a very specific sequence which GDB uses to
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recognize signal handler frames. */
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popl %eax
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movl $__NR_sigreturn, %eax
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int $0x80
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ud2
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.global VG_(x86_linux_SUBST_FOR_rt_sigreturn)
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VG_(x86_linux_SUBST_FOR_rt_sigreturn):
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/* Likewise for rt signal frames */
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movl $__NR_rt_sigreturn, %eax
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int $0x80
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ud2
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.global VG_(x86_linux_REDIR_FOR__dl_sysinfo_int80)
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VG_(x86_linux_REDIR_FOR__dl_sysinfo_int80):
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/* We can point our sysinfo stuff here */
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int $0x80
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ret
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.global VG_(trampoline_stuff_end)
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VG_(trampoline_stuff_end):
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/* and a trailing page of unexecutable code */
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UD2_PAGE
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# undef UD2_16
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# undef UD2_64
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# undef UD2_256
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# undef UD2_1024
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# undef UD2_PAGE
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/*---------------------- amd64-linux ----------------------*/
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#else
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#if defined(VGP_amd64_linux)
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# define UD2_16 ud2 ; ud2 ; ud2 ; ud2 ;ud2 ; ud2 ; ud2 ; ud2
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# define UD2_64 UD2_16 ; UD2_16 ; UD2_16 ; UD2_16
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# define UD2_256 UD2_64 ; UD2_64 ; UD2_64 ; UD2_64
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# define UD2_1024 UD2_256 ; UD2_256 ; UD2_256 ; UD2_256
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# define UD2_PAGE UD2_1024 ; UD2_1024 ; UD2_1024 ; UD2_1024
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/* a leading page of unexecutable code */
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UD2_PAGE
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.global VG_(trampoline_stuff_start)
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VG_(trampoline_stuff_start):
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.global VG_(amd64_linux_SUBST_FOR_rt_sigreturn)
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VG_(amd64_linux_SUBST_FOR_rt_sigreturn):
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/* This is a very specific sequence which GDB uses to
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recognize signal handler frames. */
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movq $__NR_rt_sigreturn, %rax
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syscall
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ud2
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.global VG_(amd64_linux_REDIR_FOR_vgettimeofday)
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VG_(amd64_linux_REDIR_FOR_vgettimeofday):
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movq $__NR_gettimeofday, %rax
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syscall
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ret
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.global VG_(amd64_linux_REDIR_FOR_vtime)
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VG_(amd64_linux_REDIR_FOR_vtime):
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movq $__NR_time, %rax
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syscall
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ret
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.global VG_(trampoline_stuff_end)
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VG_(trampoline_stuff_end):
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/* and a trailing page of unexecutable code */
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UD2_PAGE
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# undef UD2_16
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# undef UD2_64
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# undef UD2_256
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# undef UD2_1024
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# undef UD2_PAGE
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/*---------------- ppc32-linux ----------------*/
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#else
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#if defined(VGP_ppc32_linux)
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# define UD2_16 trap ; trap ; trap; trap
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# define UD2_64 UD2_16 ; UD2_16 ; UD2_16 ; UD2_16
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# define UD2_256 UD2_64 ; UD2_64 ; UD2_64 ; UD2_64
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# define UD2_1024 UD2_256 ; UD2_256 ; UD2_256 ; UD2_256
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# define UD2_PAGE UD2_1024 ; UD2_1024 ; UD2_1024 ; UD2_1024
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/* a leading page of unexecutable code */
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UD2_PAGE
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.global VG_(trampoline_stuff_start)
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VG_(trampoline_stuff_start):
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/* There's no particular reason that this needs to be handwritten
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assembly, but since that's what this file contains, here's a
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simple strlen implementation (written in C and compiled by gcc.)
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*/
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.global VG_(ppc32_linux_REDIR_FOR_strlen)
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VG_(ppc32_linux_REDIR_FOR_strlen):
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lbz 4,0(3)
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li 9,0
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cmpwi 0,4,0
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beq- 0,.L8
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.L9:
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lbzu 5,1(3)
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addi 9,9,1
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cmpwi 0,5,0
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bne+ 0,.L9
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.L8:
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mr 3,9
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blr
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.global VG_(trampoline_stuff_end)
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VG_(trampoline_stuff_end):
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# undef UD2_16
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# undef UD2_64
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# undef UD2_256
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# undef UD2_1024
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# undef UD2_PAGE
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/*---------------- unknown ----------------*/
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#else
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# error Unknown platform
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#endif
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#endif
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#endif
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/* Let the linker know we don't need an executable stack */
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.section .note.GNU-stack,"",@progbits
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/*--------------------------------------------------------------------*/
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/*--- end ---*/
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/*--------------------------------------------------------------------*/
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