1 /* Copyright (C) 1996-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ralf Baechle <ralf@linux-mips.org>, 1996.
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.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <http://www.gnu.org/licenses/>. */
19 /* clone() is even more special than fork() as it mucks with stacks
20 and invokes a function in the right context after its all over. */
25 #include <bits/errno.h>
30 #define CLONE_VM 0x00000100
31 #define CLONE_THREAD 0x00010000
33 /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
34 void *parent_tidptr, void *tls, void *child_tidptr) */
38 #if _MIPS_SIM == _ABIO32
39 # define EXTRA_LOCALS 1
41 # define EXTRA_LOCALS 0
44 FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK
45 GPOFF= FRAMESZ-(1*SZREG)
46 NESTED(__clone,4*SZREG,sp)
51 cfi_adjust_cfa_offset (FRAMESZ)
52 SETUP_GP64_STACK (GPOFF, __clone)
64 /* Sanity check arguments. */
66 beqz a0,L(error) /* No NULL function pointers. */
67 beqz a1,L(error) /* No NULL stack pointers. */
69 PTR_SUBU a1,32 /* Reserve argument save space. */
70 PTR_S a0,0(a1) /* Save function pointer. */
71 PTR_S a3,PTRSIZE(a1) /* Save argument pointer. */
73 LONG_S a2,(PTRSIZE*2)(a1) /* Save clone flags. */
78 /* Shuffle in the last three arguments - arguments 5, 6, and 7 to
79 this function, but arguments 3, 4, and 5 to the syscall. */
80 #if _MIPS_SIM == _ABIO32
81 PTR_L a2,(FRAMESZ+PTRSIZE+PTRSIZE+16)(sp)
83 PTR_L a2,(FRAMESZ+16)(sp)
84 PTR_L a3,(FRAMESZ+PTRSIZE+16)(sp)
91 /* Do the system call */
97 beqz v0,L(thread_start)
99 /* Successful return from the parent */
101 cfi_adjust_cfa_offset (FRAMESZ)
102 SETUP_GP64_STACK_CFI (GPOFF)
106 cfi_adjust_cfa_offset (-FRAMESZ)
109 /* Something bad happened -- no child created */
113 PTR_LA t9,__syscall_error
116 cfi_adjust_cfa_offset (-FRAMESZ)
121 cfi_adjust_cfa_offset (-FRAMESZ)
126 /* Load up the arguments to the function. Put this block of code in
127 its own function so that we can terminate the stack trace with our
130 ENTRY(__thread_start)
133 /* cp is already loaded. */
135 /* The stackframe has been created on entry of clone(). */
138 /* Check and see if we need to reset the PID. */
139 LONG_L a0,(PTRSIZE*2)(sp)
140 and a1,a0,CLONE_THREAD
141 beqz a1,L(restore_pid)
145 /* Restore the arg for user's function. */
146 PTR_L t9,0(sp) /* Function pointer. */
147 PTR_L a0,PTRSIZE(sp) /* Argument pointer. */
149 /* Call the user's function. */
152 /* Call _exit rather than doing it inline for breakpoint purposes. */
169 READ_THREAD_POINTER(v1)
170 INT_S v0,PID_OFFSET(v1)
171 INT_S v0,TID_OFFSET(v1)
177 weak_alias (__clone, clone)