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+++ Libc/Libc-320/ppc/sys/vfork.s
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+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/* Copyright (c) 1998 Apple Computer, Inc. All rights reserved.
+ *
+ * File: libc/ppc/sys/vfork.s
+ *
+ * HISTORY
+ * 23-Jun-1998 Umesh Vaishampayan (umeshv@apple.com)
+ * Created from fork.s
+ *
+ */
+#if 0
+#import <sys/syscall.h>
+#import <architecture/ppc/asm_help.h>
+#import <architecture/ppc/pseudo_inst.h>
+#import <mach/ppc/syscall_sw.h>
+
+/* We use 8 bytes for LOCAL_VAR(1) and LOCAL_VAR(2) */
+NESTED(_vfork, 8, 0, 0, 0)
+ CALL_EXTERN(__cthread_fork_prepare)
+#if defined(__DYNAMIC__)
+.cstring
+LC1:
+ .ascii "__dyld_fork_prepare\0"
+.text
+ .align 2
+ mflr r0
+ bl 1f
+1: mflr r3
+ mtlr r0
+ addis r3,r3,ha16(LC1-1b)
+ addi r3,r3,lo16(LC1-1b)
+ addi r4,r1,LOCAL_VAR(1)
+ bl __dyld_func_lookup
+ lwz r3,LOCAL_VAR(1)(r1)
+ mtspr ctr,r3
+ bctrl
+#endif
+ li r0,SYS_vfork
+ sc
+ b Lbotch // error return
+
+ cmpwi r4,0
+ beq Lparent // parent, since a1 == 0 in parent,
+ // 1 in child
+#if defined(__DYNAMIC__)
+.cstring
+LC3:
+ .ascii "__dyld_fork_child\0"
+.text
+ .align 2
+ mflr r0
+ bl 1f
+1: mflr r3
+ mtlr r0
+ addis r3,r3,ha16(LC3-1b)
+ addi r3,r3,lo16(LC3-1b)
+ addi r4,r1,LOCAL_VAR(1)
+ bl __dyld_func_lookup
+ lwz r3,LOCAL_VAR(1)(r1)
+ mtspr ctr,r3
+ bctrl
+#endif
+ li r3,0
+ REG_TO_EXTERN(r3, EXT(_current_pid))
+ CALL_EXTERN(_fork_mach_init)
+ CALL_EXTERN(__cthread_fork_child)
+#if defined(__DYNAMIC__)
+.cstring
+LC4:
+ .ascii "__dyld_fork_child_final\0"
+.text
+ .align 2
+ mflr r0
+ bl 1f
+1: mflr r3
+ mtlr r0
+ addis r3,r3,ha16(LC4-1b)
+ addi r3,r3,lo16(LC4-1b)
+ addi r4,r1,LOCAL_VAR(1)
+ bl __dyld_func_lookup
+ lwz r3,LOCAL_VAR(1)(r1)
+ mtspr ctr,r3
+ bctrl
+#endif
+
+ li r3,0
+ b Lreturn
+
+Lparent:
+#if defined(__DYNAMIC__)
+ stw r3,LOCAL_VAR(2)(r1) // save child pid
+ mflr r0
+ bl 1f
+1: mflr r3
+ mtlr r0
+ addis r3,r3,ha16(LC2-1b)
+ addi r3,r3,lo16(LC2-1b)
+ addi r4,r1,LOCAL_VAR(1)
+ bl __dyld_func_lookup
+ lwz r3,LOCAL_VAR(1)(r1)
+ mtspr ctr,r3
+ bctrl
+#endif
+ CALL_EXTERN(__cthread_fork_parent)
+#if defined(__DYNAMIC__)
+ lwz r3,LOCAL_VAR(2)(r1)
+#endif
+ b Lreturn
+
+Lbotch:
+#if defined(__DYNAMIC__)
+.cstring
+LC2:
+ .ascii "__dyld_fork_parent\0"
+.text
+ .align 2
+ stw r3,LOCAL_VAR(2)(r1) // save error value
+ mflr r0
+ bl 1f
+1: mflr r3
+ mtlr r0
+ addis r3,r3,ha16(LC2-1b)
+ addi r3,r3,lo16(LC2-1b)
+ addi r4,r1,LOCAL_VAR(1)
+ bl __dyld_func_lookup
+ lwz r3,LOCAL_VAR(1)(r1)
+ mtspr ctr,r3
+ bctrl
+ lwz r3,LOCAL_VAR(2)(r1) // restore error value for cerror
+
+#endif
+ CALL_EXTERN(cerror)
+ /*
+ * We use cthread_fork_parent() to clean up after a fork error
+ * (unlock cthreads and mailloc packages) so the parent
+ * process can Malloc() after fork() errors without
+ * deadlocking.
+ */
+ CALL_EXTERN_AGAIN(__cthread_fork_parent)
+ li32 r3,-1 // error return
+Lreturn: RETURN
+END(_vfork)
+#else
+#include "SYS.h"
+
+LEAF(_vfork)
+#if defined(__DYNAMIC__)
+ PICIFY(__current_pid)
+ mr r5,PICIFY_REG
+ NON_LAZY_STUB(__current_pid)
+#else
+ lis r5,ha16(__current_pid)
+ ori r5,r5,lo16(__current_pid)
+#endif
+2:
+ lwarx r6,0,r5 // dont cache pid across vfork
+ cmpwi r6,0
+ ble- 3f // is another vfork in progress
+ li r6,0 // if not, erase the stored pid
+3:
+ addi r6,r6,-1 // count the parallel vforks in
+ stwcx. r6,0,r5 // negative cached pid values
+ bne- 2b
+
+ li r0,SYS_vfork
+ sc
+ b Lbotch // error return
+
+ cmpwi r4,0
+ beq Lparent // parent, since a1 == 0 in parent,
+
+ li r3,0 // child
+ blr
+
+Lparent:
+ lwarx r6,0,r5 // were back, decrement vfork count
+ addi r6,r6,1
+ stwcx. r6,0,r5
+ bne- Lparent
+ blr
+
+Lbotch:
+ lwarx r6,0,r5 // never went, decrement vfork count
+ addi r6,r6,1
+ stwcx. r6,0,r5
+ bne- Lbotch
+
+ BRANCH_EXTERN(cerror)
+END(_vfork)
+#endif
+