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ftmemsim-valgrind/coregrind/m_trampoline.S
Julian Seward 04bb445744 Various fixes to reduce noise level on SuSE 10 (PPC). Also fix some 
ppc32 syscalls.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@4927
2005-10-15 02:00:41 +00:00

259 lines
6.8 KiB
ArmAsm
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/*--------------------------------------------------------------------*/
/*--- 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_core_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)
# define UD2_16 ud2 ; ud2 ; ud2 ; ud2 ;ud2 ; ud2 ; ud2 ; ud2
# define UD2_64 UD2_16 ; UD2_16 ; UD2_16 ; UD2_16
# define UD2_256 UD2_64 ; UD2_64 ; UD2_64 ; UD2_64
# define UD2_1024 UD2_256 ; UD2_256 ; UD2_256 ; UD2_256
# define UD2_PAGE UD2_1024 ; UD2_1024 ; UD2_1024 ; UD2_1024
/* a leading page of unexecutable code */
UD2_PAGE
.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):
/* and a trailing page of unexecutable code */
UD2_PAGE
# undef UD2_16
# undef UD2_64
# undef UD2_256
# undef UD2_1024
# undef UD2_PAGE
/*---------------------- amd64-linux ----------------------*/
#else
#if defined(VGP_amd64_linux)
# define UD2_16 ud2 ; ud2 ; ud2 ; ud2 ;ud2 ; ud2 ; ud2 ; ud2
# define UD2_64 UD2_16 ; UD2_16 ; UD2_16 ; UD2_16
# define UD2_256 UD2_64 ; UD2_64 ; UD2_64 ; UD2_64
# define UD2_1024 UD2_256 ; UD2_256 ; UD2_256 ; UD2_256
# define UD2_PAGE UD2_1024 ; UD2_1024 ; UD2_1024 ; UD2_1024
/* a leading page of unexecutable code */
UD2_PAGE
.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):
/* and a trailing page of unexecutable code */
UD2_PAGE
# undef UD2_16
# undef UD2_64
# undef UD2_256
# undef UD2_1024
# undef UD2_PAGE
/*---------------- ppc32-linux ----------------*/
#else
#if defined(VGP_ppc32_linux)
# define UD2_16 trap ; trap ; trap; trap
# define UD2_64 UD2_16 ; UD2_16 ; UD2_16 ; UD2_16
# define UD2_256 UD2_64 ; UD2_64 ; UD2_64 ; UD2_64
# define UD2_1024 UD2_256 ; UD2_256 ; UD2_256 ; UD2_256
# define UD2_PAGE UD2_1024 ; UD2_1024 ; UD2_1024 ; UD2_1024
/* a leading page of unexecutable code */
UD2_PAGE
.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)
.type VG_(ppc32_linux_REDIR_FOR_strlen), @function
VG_(ppc32_linux_REDIR_FOR_strlen):
lbz 4,0(3)
li 9,0
cmpwi 0,4,0
beq- 0,.L18
.L19:
lbzu 5,1(3)
addi 9,9,1
cmpwi 0,5,0
bne+ 0,.L19
.L18:
mr 3,9
blr
.size VG_(ppc32_linux_REDIR_FOR_strlen), .-VG_(ppc32_linux_REDIR_FOR_strlen)
/* Ditto strcmp */
.global VG_(ppc32_linux_REDIR_FOR_strcmp)
.type VG_(ppc32_linux_REDIR_FOR_strcmp), @function
VG_(ppc32_linux_REDIR_FOR_strcmp):
.L20:
lbz 0,0(3)
cmpwi 7,0,0
bne- 7,.L21
lbz 0,0(4)
li 11,0
cmpwi 7,0,0
beq- 7,.L22
.L21:
lbz 0,0(3)
li 11,-1
cmpwi 7,0,0
beq- 7,.L22
lbz 0,0(4)
li 11,1
cmpwi 7,0,0
beq- 7,.L22
lbz 9,0(3)
lbz 0,0(4)
li 11,-1
cmplw 7,9,0
blt- 7,.L22
lbz 9,0(3)
lbz 0,0(4)
li 11,1
addi 3,3,1
addi 4,4,1
cmplw 7,9,0
ble+ 7,.L20
.L22:
mr 3,11
blr
.size VG_(ppc32_linux_REDIR_FOR_strcmp), .-VG_(ppc32_linux_REDIR_FOR_strcmp)
/* Ditto index/strchr */
.global VG_(ppc32_linux_REDIR_FOR_strchr)
.type VG_(ppc32_linux_REDIR_FOR_strchr), @function
VG_(ppc32_linux_REDIR_FOR_strchr):
lbz 0,0(3)
cmpw 7,4,0
beqlr 7
cmpwi 7,0,0
beq 7,.L307
.p2align 4,,15
.L310:
lbzu 0,1(3)
cmpw 7,0,4
cmpwi 6,0,0
beq 7,.L313
bne 6,.L310
.L307:
li 3,0
blr
.L313:
blr
.size VG_(ppc32_linux_REDIR_FOR_strchr),.-VG_(ppc32_linux_REDIR_FOR_strchr)
.global VG_(trampoline_stuff_end)
VG_(trampoline_stuff_end):
# undef UD2_16
# undef UD2_64
# undef UD2_256
# undef UD2_1024
# undef UD2_PAGE
/*---------------- 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 ---*/
/*--------------------------------------------------------------------*/
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