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review.evervolv.com / android_bionic / be9b7240c2a5db3b9a23f37b57dc7513f64ad114 / . / libc / arch-mips / bionic / vfork.S
blob: c4f67c6e2aa3c265b417ee857254f172bf2501b8 [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)
dimitryfa432522017-10-25 13:07:45 +0200[diff] [blame]37__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(vfork)
Dan Albert6a918872014-08-05 20:53:31 +0000[diff] [blame]38 .set noreorder
Elliott Hughesd4ca2312017-10-11 22:27:45 -0700[diff] [blame]39 .cpload $t9
Dan Albert6a918872014-08-05 20:53:31 +0000[diff] [blame]40
Duane Sand61d9ae52015-08-11 17:00:56 -0700[diff] [blame]41 // __get_tls()[TLS_SLOT_THREAD_ID]->cached_pid_ = 0
42 .set push
43 .set mips32r2
Elliott Hughesd4ca2312017-10-11 22:27:45 -0700[diff] [blame]44 rdhwr $v0, $29 // v0 = tls; kernel trap on mips32r1
Duane Sand61d9ae52015-08-11 17:00:56 -0700[diff] [blame]45 .set pop
Elliott Hughesd4ca2312017-10-11 22:27:45 -0700[diff] [blame]46 lw $v0, REGSZ*1($v0) // v0 = v0[TLS_SLOT_THREAD_ID ie 1]
47 sw $0, REGSZ*2+4($v0) // v0->cached_pid_ = 0
Duane Sand61d9ae52015-08-11 17:00:56 -0700[diff] [blame]48
Elliott Hughesd4ca2312017-10-11 22:27:45 -0700[diff] [blame]49 li $a0, (CLONE_VM | CLONE_VFORK | SIGCHLD)
50 li $a1, 0
51 li $a2, 0
52 li $a3, 0
53 subu $sp, 8
54 sw $0, 16($sp)
55 li $v0, __NR_clone
Dan Albert6a918872014-08-05 20:53:31 +0000[diff] [blame]56 syscall
Elliott Hughesd4ca2312017-10-11 22:27:45 -0700[diff] [blame]57 addu $sp, 8
58 bnez $a3, 1f
59 move $a0, $v0
Dan Albert6a918872014-08-05 20:53:31 +0000[diff] [blame]60
Elliott Hughesd4ca2312017-10-11 22:27:45 -0700[diff] [blame]61 j $ra
Dan Albert6a918872014-08-05 20:53:31 +0000[diff] [blame]62 nop
631:
Elliott Hughesd4ca2312017-10-11 22:27:45 -0700[diff] [blame]64 la $t9, __set_errno_internal
65 j $t9
Dan Albert6a918872014-08-05 20:53:31 +0000[diff] [blame]66 nop
67END(vfork)