git://sourceware.org / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| f850220b | 1 | /* Copyright (C) 1996, 1997, 2000, 2003, 2005 Free Software Foundation, Inc. |
| a334319f UD |
2 | This file is part of the GNU C Library. |
| 3 | Contributed by Ralf Baechle <ralf@linux-mips.org>, 1996. | |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 6 | modify it under the terms of the GNU Lesser General Public | |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 9 | ||
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | Lesser General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Lesser General Public | |
| 16 | License along with the GNU C Library; if not, write to the Free | |
| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 18 | 02111-1307 USA. */ | |
| 19 | ||
| 20 | /* clone() is even more special than fork() as it mucks with stacks | |
| 21 | and invokes a function in the right context after its all over. */ | |
| 22 | ||
| 23 | #include <sys/asm.h> | |
| 24 | #include <sysdep.h> | |
| 25 | #define _ERRNO_H 1 | |
| 26 | #include <bits/errno.h> | |
| f850220b AJ |
27 | #ifdef RESET_PID |
| 28 | #include <tls.h> | |
| 29 | #endif | |
| 30 | ||
| 31 | #define CLONE_VM 0x00000100 | |
| 32 | #define CLONE_THREAD 0x00010000 | |
| a334319f | 33 | |
| f850220b AJ |
34 | /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, |
| 35 | void *parent_tidptr, void *tls, void *child_tidptr) */ | |
| a334319f UD |
36 | |
| 37 | .text | |
| f850220b AJ |
38 | #if _MIPS_SIM == _ABIO32 |
| 39 | # define EXTRA_LOCALS 1 | |
| 40 | #else | |
| 41 | # define EXTRA_LOCALS 0 | |
| 42 | #endif | |
| 43 | LOCALSZ= 4 | |
| a334319f UD |
44 | FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK |
| 45 | GPOFF= FRAMESZ-(1*SZREG) | |
| 46 | NESTED(__clone,4*SZREG,sp) | |
| 47 | #ifdef __PIC__ | |
| 48 | SETUP_GP | |
| 49 | #endif | |
| 50 | PTR_SUBU sp, FRAMESZ | |
| 51 | SETUP_GP64 (GPOFF, __clone) | |
| 52 | #ifdef __PIC__ | |
| 53 | SAVE_GP (GPOFF) | |
| 54 | #endif | |
| 55 | #ifdef PROF | |
| 56 | .set noat | |
| 57 | move $1,ra | |
| 58 | jal _mcount | |
| 59 | .set at | |
| 60 | #endif | |
| 61 | ||
| 62 | ||
| 63 | /* Sanity check arguments. */ | |
| 64 | li v0,EINVAL | |
| 65 | beqz a0,L(error) /* No NULL function pointers. */ | |
| 66 | beqz a1,L(error) /* No NULL stack pointers. */ | |
| 67 | ||
| 68 | PTR_SUBU a1,32 /* Reserve argument save space. */ | |
| 69 | PTR_S a0,0(a1) /* Save function pointer. */ | |
| 70 | PTR_S a3,PTRSIZE(a1) /* Save argument pointer. */ | |
| f850220b AJ |
71 | #ifdef RESET_PID |
| 72 | LONG_S a2,(PTRSIZE*2)(a1) /* Save clone flags. */ | |
| 73 | #endif | |
| a334319f | 74 | |
| f850220b AJ |
75 | move a0,a2 |
| 76 | ||
| 77 | /* Shuffle in the last three arguments - arguments 5, 6, and 7 to | |
| 78 | this function, but arguments 3, 4, and 5 to the syscall. */ | |
| 79 | #if _MIPS_SIM == _ABIO32 | |
| 80 | PTR_L a2,(FRAMESZ+PTRSIZE+PTRSIZE+16)(sp) | |
| 81 | PTR_S a2,16(sp) | |
| 82 | PTR_L a2,(FRAMESZ+16)(sp) | |
| 83 | PTR_L a3,(FRAMESZ+PTRSIZE+16)(sp) | |
| 84 | #else | |
| 85 | move a2,a4 | |
| 86 | move a3,a5 | |
| 87 | move a4,a6 | |
| 88 | #endif | |
| a334319f UD |
89 | |
| 90 | /* Do the system call */ | |
| a334319f UD |
91 | li v0,__NR_clone |
| 92 | syscall | |
| 93 | ||
| 94 | bnez a3,L(error) | |
| 95 | beqz v0,L(thread_start) | |
| 96 | ||
| 97 | /* Successful return from the parent */ | |
| 98 | RESTORE_GP64 | |
| 99 | PTR_ADDU sp, FRAMESZ | |
| 100 | ret | |
| 101 | ||
| 102 | /* Something bad happened -- no child created */ | |
| 103 | L(error): | |
| 104 | #ifdef __PIC__ | |
| 105 | PTR_LA t9,__syscall_error | |
| 106 | RESTORE_GP64 | |
| 107 | PTR_ADDU sp, FRAMESZ | |
| 108 | jr t9 | |
| 109 | #else | |
| 110 | RESTORE_GP64 | |
| 111 | PTR_ADDU sp, FRAMESZ | |
| 112 | j __syscall_error | |
| 113 | #endif | |
| 114 | END(__clone) | |
| 115 | ||
| 116 | /* Load up the arguments to the function. Put this block of code in | |
| 117 | its own function so that we can terminate the stack trace with our | |
| 118 | debug info. */ | |
| 119 | ||
| 120 | ENTRY(__thread_start) | |
| 121 | L(thread_start): | |
| 122 | /* cp is already loaded. */ | |
| 123 | SAVE_GP (GPOFF) | |
| 124 | /* The stackframe has been created on entry of clone(). */ | |
| f850220b AJ |
125 | |
| 126 | #ifdef RESET_PID | |
| 127 | /* Check and see if we need to reset the PID. */ | |
| 128 | LONG_L a0,(PTRSIZE*2)(sp) | |
| 129 | and a1,a0,CLONE_THREAD | |
| 130 | beqz a1,L(restore_pid) | |
| 131 | L(donepid): | |
| 132 | #endif | |
| 133 | ||
| a334319f UD |
134 | /* Restore the arg for user's function. */ |
| 135 | PTR_L t9,0(sp) /* Function pointer. */ | |
| 136 | PTR_L a0,PTRSIZE(sp) /* Argument pointer. */ | |
| 137 | ||
| 138 | /* Call the user's function. */ | |
| 139 | jal t9 | |
| 140 | ||
| 141 | /* Call _exit rather than doing it inline for breakpoint purposes. */ | |
| 142 | move a0,v0 | |
| 143 | #ifdef __PIC__ | |
| 144 | PTR_LA t9,_exit | |
| 145 | jalr t9 | |
| 146 | #else | |
| 147 | jal _exit | |
| 148 | #endif | |
| f850220b AJ |
149 | |
| 150 | #ifdef RESET_PID | |
| 151 | L(restore_pid): | |
| 152 | and a1,a0,CLONE_VM | |
| 153 | li v0,-1 | |
| 154 | bnez a1,L(gotpid) | |
| 155 | li v0,__NR_getpid | |
| 156 | syscall | |
| 157 | L(gotpid): | |
| 158 | READ_THREAD_POINTER(v1) | |
| 159 | INT_S v0,PID_OFFSET(v1) | |
| 160 | INT_S v0,TID_OFFSET(v1) | |
| 161 | b L(donepid) | |
| 162 | #endif | |
| 163 | ||
| a334319f UD |
164 | END(__thread_start) |
| 165 | ||
| 1ab18a5b | 166 | weak_alias (__clone, clone) |