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gerrit.omnirom.org / android_bionic / ae7483db2a6a93c0cb0c0eebc26f64b23168c6d3 / . / libc / arch-mips / bionic / vfork.S
blob: fdd6a69b3211891a57167a280322ac4560770157 [file] [log] [blame]
Serban Constantinescue2104882013-09-26 11:37:10 +0100[diff] [blame]1/*
Dan Albert6a918872014-08-05 20:53:31 +0000[diff] [blame]2 * Copyright (C) 2008 The Android Open Source Project
Elliott Hughes54a74942014-01-03 16:40:37 -0800[diff] [blame]3 * All rights reserved.
Serban Constantinescue2104882013-09-26 11:37:10 +0100[diff] [blame]4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
Dan Albert6a918872014-08-05 20:53:31 +0000[diff] [blame]29#include <private/bionic_asm.h>
30#include <linux/sched.h>
Serban Constantinescue2104882013-09-26 11:37:10 +0100[diff] [blame]31
Dan Albert6a918872014-08-05 20:53:31 +0000[diff] [blame]32// TODO: mips' uapi signal.h is missing #ifndef __ASSEMBLY__.
33// #include <asm/signal.h>
34#define SIGCHLD 18
35
36ENTRY(vfork)
37 .set noreorder
Elliott Hughesd4ca2312017-10-11 22:27:45 -0700[diff] [blame]38 .cpload $t9
Dan Albert6a918872014-08-05 20:53:31 +0000[diff] [blame]39
Duane Sand61d9ae52015-08-11 17:00:56 -0700[diff] [blame]40 // __get_tls()[TLS_SLOT_THREAD_ID]->cached_pid_ = 0
41 .set push
42 .set mips32r2
Elliott Hughesd4ca2312017-10-11 22:27:45 -0700[diff] [blame]43 rdhwr $v0, $29 // v0 = tls; kernel trap on mips32r1
Duane Sand61d9ae52015-08-11 17:00:56 -0700[diff] [blame]44 .set pop
Elliott Hughesd4ca2312017-10-11 22:27:45 -0700[diff] [blame]45 lw $v0, REGSZ*1($v0) // v0 = v0[TLS_SLOT_THREAD_ID ie 1]
46 sw $0, REGSZ*2+4($v0) // v0->cached_pid_ = 0
Duane Sand61d9ae52015-08-11 17:00:56 -0700[diff] [blame]47
Elliott Hughesd4ca2312017-10-11 22:27:45 -0700[diff] [blame]48 li $a0, (CLONE_VM | CLONE_VFORK | SIGCHLD)
49 li $a1, 0
50 li $a2, 0
51 li $a3, 0
52 subu $sp, 8
53 sw $0, 16($sp)
54 li $v0, __NR_clone
Dan Albert6a918872014-08-05 20:53:31 +0000[diff] [blame]55 syscall
Elliott Hughesd4ca2312017-10-11 22:27:45 -0700[diff] [blame]56 addu $sp, 8
57 bnez $a3, 1f
58 move $a0, $v0
Dan Albert6a918872014-08-05 20:53:31 +0000[diff] [blame]59
Elliott Hughesd4ca2312017-10-11 22:27:45 -0700[diff] [blame]60 j $ra
Dan Albert6a918872014-08-05 20:53:31 +0000[diff] [blame]61 nop
621:
Elliott Hughesd4ca2312017-10-11 22:27:45 -0700[diff] [blame]63 la $t9, __set_errno_internal
64 j $t9
Dan Albert6a918872014-08-05 20:53:31 +0000[diff] [blame]65 nop
66END(vfork)