3460db9490
Move the stackpointer so a captured signal does not corrupt stack variables needed for __thread_entry. Change-Id: I3e1e7b94a6d7cd3a07081f849043262743aa8064
117 lines
3.3 KiB
ArmAsm
117 lines
3.3 KiB
ArmAsm
/*
|
|
* Copyright (C) 2008-2010 The Android Open Source Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
#include <sys/linux-syscalls.h>
|
|
#include <machine/asm.h>
|
|
|
|
ENTRY(__pthread_clone)
|
|
@ insert the args onto the new stack
|
|
stmdb r1!, {r0, r3}
|
|
|
|
@ do the system call
|
|
@ get flags
|
|
|
|
mov r0, r2
|
|
|
|
@ new sp is already in r1
|
|
|
|
#if __ARM_EABI__
|
|
stmfd sp!, {r4, r7}
|
|
ldr r7, =__NR_clone
|
|
swi #0
|
|
#else
|
|
swi #__NR_clone
|
|
#endif
|
|
|
|
movs r0, r0
|
|
#if __ARM_EABI__
|
|
ldmnefd sp!, {r4, r7}
|
|
#endif
|
|
blt __error
|
|
bxne lr
|
|
|
|
|
|
@ pick the function arg and call address off the stack and jump
|
|
@ to the C __thread_entry function which does some setup and then
|
|
@ calls the thread's start function
|
|
|
|
pop {r0, r1}
|
|
mov r2, sp @ __thread_entry needs the TLS pointer
|
|
b __thread_entry
|
|
|
|
__error:
|
|
mov r0, #-1
|
|
bx lr
|
|
END(__pthread_clone)
|
|
|
|
|
|
#
|
|
# This function is defined as:
|
|
#
|
|
# pid_t __bionic_clone( int flags, void *child_stack,
|
|
# pid_t *pid, void *tls, pid_t *ctid,
|
|
# int (*fn)(void *), void* arg );
|
|
#
|
|
# NOTE: This is not the same signature than the GLibc
|
|
# __clone function here !! Placing 'fn' and 'arg'
|
|
# at the end of the parameter list makes the
|
|
# implementation much simpler.
|
|
#
|
|
|
|
ENTRY(__bionic_clone)
|
|
mov ip, sp
|
|
.save {r4, r5, r6, r7}
|
|
|
|
# save registers to parent stack
|
|
stmfd sp!, {r4, r5, r6, r7}
|
|
|
|
# load extra parameters
|
|
ldmfd ip, {r4, r5, r6}
|
|
|
|
# store 'fn' and 'arg' to the child stack
|
|
str r5, [r1, #-4]
|
|
str r6, [r1, #-8]
|
|
|
|
# system call
|
|
ldr r7, =__NR_clone
|
|
swi #0
|
|
movs r0, r0
|
|
beq 1f
|
|
|
|
# in parent, reload saved registers
|
|
# then either exit or error
|
|
#
|
|
ldmfd sp!, {r4, r5, r6, r7}
|
|
bxne lr
|
|
b __set_syscall_errno
|
|
|
|
1: # in the child - pick arguments
|
|
ldr r0, [sp, #-4]
|
|
ldr r1, [sp, #-8]
|
|
b __bionic_clone_entry
|
|
END(__bionic_clone)
|