| Raghu Gandham | 405b802 | 2012-07-25 18:16:42 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2008 The Android Open Source Project |
| 3 | * All rights reserved. |
| 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 | #include <linux/sched.h> |
| 29 | #include <sys/linux-syscalls.h> |
| 30 | #include <linux/errno.h> |
| 31 | |
| 32 | .text |
| 33 | .type __pthread_clone, @function |
| 34 | .global __pthread_clone |
| 35 | .align 4 |
| 36 | .ent __pthread_clone |
| 37 | |
| 38 | /* |
| 39 | * int __pthread_clone(int (*fn)(void*), void *child_stack, |
| 40 | * int flags, void *arg); |
| 41 | */ |
| 42 | |
| 43 | __pthread_clone: |
| 44 | .set noreorder |
| 45 | .cpload $t9 |
| 46 | .set reorder |
| 47 | |
| 48 | # set up child stack |
| 49 | subu $a1,16 |
| 50 | sw $a0,0($a1) # fn |
| 51 | sw $a3,4($a1) # arg |
| 52 | # sw $a1+16,8($a1) # tls |
| 53 | |
| 54 | /* |
| 55 | * int sys_clone(int flags, void *child_stack, int *parent_tidptr, |
| 56 | * struct user_desc *newtls, int *child_tidptr); |
| 57 | */ |
| 58 | |
| 59 | move $a0,$a2 # flags |
| 60 | # move $a1,$a1 # child_stack |
| 61 | move $a2,$0 # parent_tidptr |
| 62 | move $a3,$0 # user_desc |
| 63 | and $a0,~(CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID) |
| 64 | # make sure the kernel doesn't access child_tidptr |
| 65 | |
| 66 | li $v0,__NR_clone |
| 67 | syscall |
| 68 | |
| 69 | bnez $a3,.L__error |
| 70 | |
| 71 | beqz $v0,.L__thread_start |
| 72 | |
| 73 | j $ra |
| 74 | |
| 75 | .L__thread_start: |
| 76 | lw $a0,0($sp) # fn |
| 77 | lw $a1,4($sp) # arg |
| 78 | addu $a2,$sp,16 # tls |
| 79 | |
| 80 | # void __thread_entry(int (*func)(void*), void *arg, void *tls) |
| 81 | la $t9, __thread_entry |
| 82 | j $t9 |
| 83 | |
| 84 | .L__error: |
| 85 | move $a0,$v0 |
| 86 | la $t9,__set_errno |
| 87 | j $t9 |
| 88 | |
| 89 | .end __pthread_clone |
| 90 | |
| 91 | |
| 92 | # |
| 93 | # This function is defined as: |
| 94 | # |
| 95 | # pid_t __bionic_clone( int flags, void *child_stack, |
| 96 | # pid_t *pid, void *tls, pid_t *ctid, |
| 97 | # int (*fn)(void *), void* arg ); |
| 98 | # |
| 99 | # NOTE: This is not the same signature than the GLibc |
| 100 | # __clone function here !! Placing 'fn' and 'arg' |
| 101 | # at the end of the parameter list makes the |
| 102 | # implementation much simpler. |
| 103 | # |
| 104 | .text |
| 105 | .type __bionic_clone, @function |
| 106 | .global __bionic_clone |
| 107 | .align 4 |
| 108 | .ent __bionic_clone |
| 109 | __bionic_clone: |
| 110 | .set noreorder |
| 111 | .cpload $t9 |
| 112 | .set reorder |
| 113 | |
| 114 | # set up child stack |
| 115 | subu $a1,16 |
| 116 | lw $t0,20($sp) # fn |
| 117 | lw $t1,24($sp) # arg |
| 118 | sw $t0,0($a1) # fn |
| 119 | sw $t1,4($a1) # arg |
| 120 | |
| 121 | # remainder of arguments are correct for clone system call |
| 122 | li $v0,__NR_clone |
| 123 | syscall |
| 124 | |
| 125 | bnez $a3,.L__error_bc |
| 126 | |
| 127 | beqz $v0,.L__thread_start_bc |
| 128 | |
| 129 | j $ra |
| 130 | |
| 131 | .L__thread_start_bc: |
| 132 | lw $a0,0($sp) # fn |
| 133 | lw $a1,4($sp) # arg |
| 134 | |
| 135 | # void __bionic_clone_entry(int (*func)(void*), void *arg) |
| 136 | la $t9,__bionic_clone_entry |
| 137 | j $t9 |
| 138 | |
| 139 | .L__error_bc: |
| 140 | move $a0,$v0 |
| 141 | la $t9,__set_errno |
| 142 | j $t9 |
| 143 | |
| 144 | .end __bionic_clone |
| 145 | |