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https://github.com/Zenithsiz/ftmemsim-valgrind.git
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414846a941
cause the stack to be marked as executable in order for them to work. All assembler files have also had a declaration added so that the object they generate will be marked as not needing an executable stack. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@2446
127 lines
3.4 KiB
ArmAsm
127 lines
3.4 KiB
ArmAsm
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##--------------------------------------------------------------------##
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##--- Support for doing system calls. ---##
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##--- vg_syscall.S ---##
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##--------------------------------------------------------------------##
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/*
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This file is part of Valgrind, an extensible x86 protected-mode
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emulator for monitoring program execution on x86-Unixes.
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Copyright (C) 2000-2004 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 "vg_constants.h"
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#include "vg_unistd.h"
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.globl VG_(do_syscall)
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/*
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Perform a Linux syscall with int 0x80
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Syscall args are passed on the stack
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Int VG_(do_syscall)(Int syscall_no, ...)
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This has no effect on the virtual machine; the expectation is
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that the syscall mechanism makes no useful changes to any
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register except %eax, which is returned.
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*/
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VG_(do_syscall):
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push %esi
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push %edi
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push %ebx
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push %ebp
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movl 16+ 4(%esp),%eax
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movl 16+ 8(%esp),%ebx
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movl 16+12(%esp),%ecx
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movl 16+16(%esp),%edx
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movl 16+20(%esp),%esi
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movl 16+24(%esp),%edi
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movl 16+28(%esp),%ebp
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int $0x80
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popl %ebp
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popl %ebx
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popl %edi
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popl %esi
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ret
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/*
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Perform a clone system call. clone is strange because it has
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fork()-like return-twice semantics, so it needs special
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handling here.
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int VG_(clone)(int (*fn)(void *), void *child_stack, int flags, void *arg,
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0 4 8 12
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pid_t *child_tid, pid_t *parent_tid)
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16 20
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*/
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.globl VG_(clone)
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VG_(clone):
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#define FSZ (4+4+4) /* frame size = retaddr+ebx+edi */
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push %ebx
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push %edi
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/* set up child stack with function and arg */
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movl 4+FSZ(%esp), %ecx /* child stack */
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movl 12+FSZ(%esp), %ebx /* fn arg */
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movl 0+FSZ(%esp), %eax /* fn */
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lea -8(%ecx), %ecx /* make space on stack */
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movl %ebx, 4(%ecx) /* fn arg */
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movl %eax, 0(%ecx) /* fn */
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/* get other args to clone */
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movl 8+FSZ(%esp), %ebx /* flags */
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movl 20+FSZ(%esp), %edx /* parent tid * */
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movl 16+FSZ(%esp), %edi /* child tid * */
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movl $__NR_clone, %eax
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int $0x80
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testl %eax, %eax
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jnz 1f
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/* CHILD - call thread function */
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popl %eax
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call *%eax
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/* exit with result */
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movl %eax, %ebx
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movl $__NR_exit, %eax
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int $0x80
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/* Hm, exit returned */
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ud2
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1: /* PARENT or ERROR */
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pop %edi
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pop %ebx
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ret
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.globl VG_(sigreturn)
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VG_(sigreturn):
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movl $__NR_rt_sigreturn, %eax
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int $0x80
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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 vg_syscall.S ---##
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##--------------------------------------------------------------------##
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