1 /* Copyright (C) 1996-2024 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library. If not, see
16 <https://www.gnu.org/licenses/>. */
18 /* clone() is even more special than fork() as it mucks with stacks
19 and invokes a function in the right context after its all over. */
24 #include <bits/errno.h>
27 /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
28 void *parent_tidptr, void *tls, void *child_tidptr) */
32 #if _MIPS_SIM == _ABIO32
33 # define EXTRA_LOCALS 1
35 # define EXTRA_LOCALS 0
38 FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK
39 GPOFF= FRAMESZ-(1*SZREG)
40 NESTED(__clone,4*SZREG,sp)
45 cfi_adjust_cfa_offset (FRAMESZ)
46 SETUP_GP64_STACK (GPOFF, __clone)
57 /* Align stack to 8/16 bytes per the ABI. */
58 #if _MIPS_SIM == _ABIO32
65 /* Sanity check arguments. */
67 beqz a0,L(error) /* No NULL function pointers. */
68 beqz a1,L(error) /* No NULL stack pointers. */
70 PTR_SUBU a1,32 /* Reserve argument save space. */
71 PTR_S a0,0(a1) /* Save function pointer. */
72 PTR_S a3,PTRSIZE(a1) /* Save argument pointer. */
73 LONG_S a2,(PTRSIZE*2)(a1) /* Save clone flags. */
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)
82 PTR_L a2,(FRAMESZ+16)(sp)
83 PTR_L a3,(FRAMESZ+PTRSIZE+16)(sp)
90 /* Do the system call */
96 beqz v0,L(thread_start)
98 /* Successful return from the parent */
100 cfi_adjust_cfa_offset (FRAMESZ)
101 SETUP_GP64_STACK_CFI (GPOFF)
105 cfi_adjust_cfa_offset (-FRAMESZ)
108 /* Something bad happened -- no child created */
112 PTR_LA t9,__syscall_error
115 cfi_adjust_cfa_offset (-FRAMESZ)
120 cfi_adjust_cfa_offset (-FRAMESZ)
125 /* Load up the arguments to the function. Put this block of code in
126 its own function so that we can terminate the stack trace with our
129 ENTRY(__thread_start)
132 /* cp is already loaded. */
134 /* The stackframe has been created on entry of clone(). */
136 /* Restore the arg for user's function. */
137 PTR_L t9,0(sp) /* Function pointer. */
138 PTR_L a0,PTRSIZE(sp) /* Argument pointer. */
140 /* Call the user's function. */
149 libc_hidden_def (__clone)
150 weak_alias (__clone, clone)