| 1 | /* Copyright (C) 1996-2024 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library. If not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | /* clone() is even more special than fork() as it mucks with stacks |
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| 19 | and invokes a function in the right context after its all over. */ |
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| 20 | |
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| 21 | #include <sysdep.h> |
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| 22 | #define _ERRNO_H 1 |
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| 23 | #include <bits/errno.h> |
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| 24 | #include <tls.h> |
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| 25 | |
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| 26 | /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, |
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| 27 | void *parent_tidptr, void *tls, void *child_tidptr) */ |
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| 28 | |
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| 29 | .text |
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| 30 | ENTRY (__clone) |
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| 31 | |
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| 32 | /* Sanity check arguments. */ |
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| 33 | movel #-EINVAL, %d0 |
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| 34 | movel 4(%sp), %a0 /* no NULL function pointers */ |
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| 35 | tstl %a0 |
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| 36 | jeq SYSCALL_ERROR_LABEL |
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| 37 | movel 8(%sp), %a1 /* no NULL stack pointers */ |
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| 38 | tstl %a1 |
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| 39 | jeq SYSCALL_ERROR_LABEL |
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| 40 | |
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| 41 | /* Allocate space and copy the argument onto the new stack. */ |
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| 42 | movel 16(%sp), -(%a1) |
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| 43 | |
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| 44 | /* Do the system call */ |
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| 45 | movel 12+0(%sp), %d1 /* get flags */ |
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| 46 | movel %d3, -(%a1) /* save %d3 and get parent_tidptr */ |
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| 47 | movel %d3, -(%sp) |
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| 48 | cfi_adjust_cfa_offset (4) |
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| 49 | cfi_rel_offset (%d3, 0) |
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| 50 | movel 20+4(%sp), %d3 |
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| 51 | movel %d4, -(%a1) /* save %d4 and get child_tidptr */ |
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| 52 | movel %d4, -(%sp) |
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| 53 | cfi_adjust_cfa_offset (4) |
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| 54 | cfi_rel_offset (%d4, 0) |
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| 55 | movel 28+8(%sp), %d4 |
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| 56 | movel %d5, -(%a1) /* save %d5 and get tls */ |
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| 57 | movel %d5, -(%sp) |
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| 58 | cfi_adjust_cfa_offset (4) |
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| 59 | cfi_rel_offset (%d5, 0) |
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| 60 | movel 24+12(%sp), %d5 |
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| 61 | /* save %d2 and get stack pointer */ |
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| 62 | #ifdef __mcoldfire__ |
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| 63 | movel %d2, -(%a1) |
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| 64 | movel %d2, -(%sp) |
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| 65 | cfi_adjust_cfa_offset (4) |
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| 66 | cfi_rel_offset (%d2, 0) |
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| 67 | movel %a1, %d2 |
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| 68 | #else |
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| 69 | exg %d2, %a1 /* save %d2 and get stack pointer */ |
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| 70 | cfi_register (%d2, %a1) |
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| 71 | #endif |
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| 72 | movel #SYS_ify (clone), %d0 |
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| 73 | |
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| 74 | /* End FDE now, because in the child the unwind info will be |
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| 75 | wrong. */ |
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| 76 | cfi_endproc |
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| 77 | |
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| 78 | trap #0 |
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| 79 | #ifdef __mcoldfire__ |
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| 80 | movel (%sp)+, %d2 |
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| 81 | #else |
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| 82 | exg %d2, %a1 /* restore %d2 */ |
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| 83 | #endif |
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| 84 | movel (%sp)+, %d5 /* restore %d5, %d4 and %d3 */ |
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| 85 | movel (%sp)+, %d4 |
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| 86 | movel (%sp)+, %d3 |
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| 87 | |
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| 88 | tstl %d0 |
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| 89 | jmi SYSCALL_ERROR_LABEL |
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| 90 | jeq 1f |
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| 91 | |
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| 92 | rts |
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| 93 | |
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| 94 | 1: |
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| 95 | cfi_startproc |
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| 96 | cfi_undefined (pc) /* Mark end of stack */ |
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| 97 | subl %fp, %fp /* terminate the stack frame */ |
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| 98 | jsr (%a0) |
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| 99 | movel %d0, %d1 |
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| 100 | movel #SYS_ify (exit), %d0 |
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| 101 | trap #0 |
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| 102 | cfi_endproc |
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| 103 | |
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| 104 | cfi_startproc |
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| 105 | PSEUDO_END (__clone) |
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| 106 | |
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| 107 | libc_hidden_def (__clone) |
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| 108 | weak_alias (__clone, clone) |
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| 109 | |
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