| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 2003, 2004 Free Software Foudnation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | Contributed by Alexandre Oliva <aoliva@redhat.com>, 2003. |
| 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 <features.h> |
| 24 | #include <asm/unistd.h> |
| 25 | #define _ERRNO_H 1 |
| 26 | #include <bits/errno.h> |
| 27 | |
| 28 | .text |
| 29 | .globl clone |
| 30 | .type clone,@function |
| 31 | /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */ |
| 32 | clone: |
| 33 | /* Sanity check arguments. */ |
| 34 | cmp.p gr8, gr0, icc0 |
| 35 | cmp gr9, gr0, icc1 |
| 36 | mov.p gr8, gr4 |
| 37 | beq icc0, #0, .Lerror |
| 38 | mov.p gr11, gr5 |
| 39 | beq icc1, #0, .Lerror |
| 40 | |
| 41 | mov.p gr10, gr8 |
| 42 | setlos #__NR_clone, gr7 |
| 43 | tra gr0,gr0 |
| 44 | |
| 45 | cmp.p gr8, gr0, icc0 |
| 46 | setlos #-4096, gr6 |
| 47 | cmp.p gr8, gr6, icc1 |
| 48 | beq icc0, #0, .Lthread_start |
| 49 | blslr icc1, #2 |
| 50 | |
| 51 | .Lsys_error: |
| 52 | sethi.p #gotofffuncdeschi(__syscall_error), gr14 |
| 53 | setlo #gotofffuncdesclo(__syscall_error), gr14 |
| 54 | ldd @(gr14, gr15), gr14 |
| 55 | jmpl @(gr14, gr0) |
| 56 | |
| 57 | .Lerror: |
| 58 | setlos.p #-EINVAL, gr8 |
| 59 | bra .Lsys_error |
| 60 | |
| 61 | ############################################################################### |
| 62 | # |
| 63 | # come here as the new thread [GR4 is fn, GR5 is arg] |
| 64 | # |
| 65 | ############################################################################### |
| 66 | .Lthread_start: |
| 67 | /* Save the PIC register. */ |
| 68 | mov gr15, gr17 |
| 69 | |
| 70 | /* Call the user's function. */ |
| 71 | ldd.p @(gr4, gr0), gr14 |
| 72 | mov gr5, gr8 |
| 73 | calll @(gr14, gr0) |
| 74 | |
| 75 | /* Call _exit, rather simply inlining the syscall, such that |
| 76 | breakpoints work.*/ |
| 77 | |
| 78 | mov.p gr17, gr15 |
| 79 | call HIDDEN_JUMPTARGET(_exit) |
| 80 | |
| 81 | /* Should never get here. */ |
| 82 | jmpl @(gr0, gr0) |
| 83 | .size clone,.-clone |