__clone.S revision 1.1.2.4
1 1.1.2.4 nathanw /* $NetBSD: __clone.S,v 1.1.2.4 2002/09/17 21:32:43 nathanw Exp $ */ 2 1.1.2.2 nathanw 3 1.1.2.2 nathanw /* 4 1.1.2.2 nathanw * Copyright (c) 2001 Christopher Gilbert 5 1.1.2.2 nathanw * All rights reserved. 6 1.1.2.2 nathanw * 7 1.1.2.2 nathanw * 1. Redistributions of source code must retain the above copyright 8 1.1.2.2 nathanw * notice, this list of conditions and the following disclaimer. 9 1.1.2.2 nathanw * 2. Redistributions in binary form must reproduce the above copyright 10 1.1.2.2 nathanw * notice, this list of conditions and the following disclaimer in the 11 1.1.2.2 nathanw * documentation and/or other materials provided with the distribution. 12 1.1.2.2 nathanw * 3. The name of the company nor the name of the author may be used to 13 1.1.2.2 nathanw * endorse or promote products derived from this software without specific 14 1.1.2.2 nathanw * prior written permission. 15 1.1.2.2 nathanw * 16 1.1.2.2 nathanw * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 17 1.1.2.2 nathanw * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 18 1.1.2.2 nathanw * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 1.1.2.2 nathanw * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 20 1.1.2.2 nathanw * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 21 1.1.2.2 nathanw * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 1.1.2.2 nathanw * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 1.1.2.2 nathanw * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 1.1.2.2 nathanw * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.1.2.2 nathanw * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.1.2.2 nathanw * SUCH DAMAGE. 27 1.1.2.2 nathanw */ 28 1.1.2.2 nathanw 29 1.1.2.2 nathanw #include <machine/asm.h> 30 1.1.2.2 nathanw #include <sys/errno.h> 31 1.1.2.2 nathanw #include "SYS.h" 32 1.1.2.2 nathanw 33 1.1.2.2 nathanw #ifdef WEAK_ALIAS 34 1.1.2.2 nathanw WEAK_ALIAS(clone, __clone) 35 1.1.2.2 nathanw #endif 36 1.1.2.2 nathanw 37 1.1.2.2 nathanw /* 38 1.1.2.2 nathanw * int __clone(int (*fn)(void *), void *stack, int flags, void *arg); 39 1.1.2.2 nathanw */ 40 1.1.2.2 nathanw ENTRY(__clone) 41 1.1.2.2 nathanw 42 1.1.2.2 nathanw /* test stack and function are not null */ 43 1.1.2.2 nathanw teq r0, #0x00 44 1.1.2.2 nathanw teqne r1, #0x00 45 1.1.2.3 nathanw beq .Leinval 46 1.1.2.2 nathanw 47 1.1.2.2 nathanw /* place the func and it's arg onto the child's stack */ 48 1.1.2.2 nathanw stmfd r1!, {r0, r3} 49 1.1.2.2 nathanw 50 1.1.2.2 nathanw /* syscall expects (flags, stack) */ 51 1.1.2.2 nathanw mov r0, r2 52 1.1.2.2 nathanw 53 1.1.2.2 nathanw SYSTRAP(__clone) 54 1.1.2.2 nathanw bcs PIC_SYM(CERROR, PLT) 55 1.1.2.2 nathanw 56 1.1.2.2 nathanw /* 57 1.1.2.2 nathanw * r1 and r0 are the same as from fork: 58 1.1.2.2 nathanw * r1 == 0 in parent process, r1 == 1 in child process. 59 1.1.2.2 nathanw * r0 == pid of child in parent, r0 == pid of parent in child. 60 1.1.2.2 nathanw */ 61 1.1.2.2 nathanw teq r1, #0x00 62 1.1.2.2 nathanw 63 1.1.2.2 nathanw /* if this is the parent then just return the pid */ 64 1.1.2.2 nathanw #ifdef __APCS_26__ 65 1.1.2.2 nathanw moveqs r15, r14 66 1.1.2.2 nathanw #else 67 1.1.2.2 nathanw moveq r15, r14 68 1.1.2.2 nathanw #endif 69 1.1.2.2 nathanw /* 70 1.1.2.2 nathanw * This is the child 71 1.1.2.2 nathanw * load the function and arg off the stack 72 1.1.2.2 nathanw */ 73 1.1.2.2 nathanw ldmfd sp!, {r1, r2} 74 1.1.2.2 nathanw 75 1.1.2.2 nathanw /* setup return address */ 76 1.1.2.3 nathanw add lr, pc, #.Lreturnhere - . - 8 77 1.1.2.2 nathanw 78 1.1.2.2 nathanw /* place arg in r0 */ 79 1.1.2.2 nathanw mov r0, r2 80 1.1.2.2 nathanw 81 1.1.2.2 nathanw /* call the function */ 82 1.1.2.2 nathanw mov pc, r1 83 1.1.2.2 nathanw 84 1.1.2.3 nathanw .Lreturnhere: 85 1.1.2.2 nathanw /* call _exit with the returned value */ 86 1.1.2.4 nathanw b PIC_SYM(_C_LABEL(_exit), PLT) 87 1.1.2.2 nathanw 88 1.1.2.2 nathanw /* NOTREACHED */ 89 1.1.2.2 nathanw 90 1.1.2.2 nathanw /* error handler if func or stack is NULL */ 91 1.1.2.3 nathanw .Leinval: 92 1.1.2.2 nathanw mov R0, #EINVAL 93 1.1.2.2 nathanw b PIC_SYM(CERROR, PLT) 94
Indexes created Thu Oct 02 14:10:14 GMT 2025