/*
- * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 1999-2004 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
* Created from M68K sources
*/
-#import <sys/syscall.h>
-#import <architecture/ppc/asm_help.h>
-#import <architecture/ppc/pseudo_inst.h>
-#import <mach/ppc/syscall_sw.h>
+/* We use mode-independent "g" opcodes such as "srgi". These expand
+ * into word operations when targeting __ppc__, and into doubleword
+ * operations when targeting __ppc64__.
+ */
+#include <architecture/ppc/mode_independent_asm.h>
+
+#include "SYS.h"
-/* We use 8 bytes for LOCAL_VAR(1) and LOCAL_VAR(2) */
-NESTED(_fork, 8, 0, 0, 0)
- CALL_EXTERN(__cthread_fork_prepare)
+
+MI_ENTRY_POINT(_fork)
+ MI_PUSH_STACK_FRAME
+
+ MI_CALL_EXTERNAL(__cthread_fork_prepare)
+
#if defined(__DYNAMIC__)
-.cstring
+ .cstring
LC1:
.ascii "__dyld_fork_prepare\0"
-.text
+ .text
.align 2
mflr r0
- bl 1f
+ bcl 20,31,1f
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)
+ addi r4,r1,SF_LOCAL1
+ bl __dyld_func_lookup
+ lg r3,SF_LOCAL1(r1)
mtspr ctr,r3
bctrl
#endif
- li r0,SYS_fork
- sc
- b Lbotch // error return
- cmpwi r4,0
- beq Lparent // parent, since a1 == 0 in parent,
- // 1 in child
+ li r0,SYS_fork
+ sc // do the fork
+ b Lbotch // error return
+
+ cmpwi r4,0 // parent (r4==0) or child (r4==1) ?
+ beq Lparent // parent, since r4==0
+
+
+/* Here if we are the child. */
+
#if defined(__DYNAMIC__)
-.cstring
+ .cstring
LC3:
.ascii "__dyld_fork_child\0"
-.text
+ .text
.align 2
mflr r0
- bl 1f
+ bcl 20,31,1f
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)
+ addi r4,r1,SF_LOCAL1
+ bl __dyld_func_lookup
+ lg r3,SF_LOCAL1(r1)
mtspr ctr,r3
bctrl
#endif
- li r3,0x0 // clear cached pid in child
- REG_TO_EXTERN(r3,__current_pid)
- CALL_EXTERN(__cthread_fork_child)
+
+ li r9,0
+ MI_GET_ADDRESS(r8,__current_pid)
+ stw r9,0(r8) // clear cached pid in child
+
+ MI_CALL_EXTERNAL(__cthread_fork_child)
+
#if defined(__DYNAMIC__)
-.cstring
+ .cstring
LC4:
.ascii "__dyld_fork_child_final\0"
-.text
+ .text
.align 2
mflr r0
- bl 1f
+ bcl 20,31,1f
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)
+ addi r4,r1,SF_LOCAL1
+ bl __dyld_func_lookup
+ lg r3,SF_LOCAL1(r1)
mtspr ctr,r3
bctrl
#endif
- li r3,0
+ li r3,0 // flag for "we are the child"
b Lreturn
+
+/* Here if we are the parent, with:
+ * r3 = child's pid
+ */
Lparent:
+ stg r3,SF_LOCAL2(r1) // save child pid in stack
+
#if defined(__DYNAMIC__)
- stw r3,LOCAL_VAR(2)(r1) // save child pid
mflr r0
- bl 1f
+ bcl 20,31,1f
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)
+ addi r4,r1,SF_LOCAL1
+ bl __dyld_func_lookup
+ lg r3,SF_LOCAL1(r1)
mtspr ctr,r3
bctrl
#endif
- CALL_EXTERN(__cthread_fork_parent)
-#if defined(__DYNAMIC__)
- lwz r3,LOCAL_VAR(2)(r1)
-#endif
- b Lreturn
+
+ b Lparent_return // clean up and return child's pid
+
+
+/* Here if the fork() syscall failed. We're still the parent. */
Lbotch:
+
#if defined(__DYNAMIC__)
-.cstring
+ .cstring
LC2:
.ascii "__dyld_fork_parent\0"
-.text
+ .text
.align 2
- stw r3,LOCAL_VAR(2)(r1) // save error value
+ stg r3,SF_LOCAL2(r1) // save error return in stack
mflr r0
- bl 1f
+ bcl 20,31,1f
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)
+ addi r4,r1,SF_LOCAL1
+ bl __dyld_func_lookup
+ lg r3,SF_LOCAL1(r1)
mtspr ctr,r3
bctrl
- lwz r3,LOCAL_VAR(2)(r1) // restore error value for cerror
-
+ lg r3,SF_LOCAL2(r1) // restore error code
#endif
- CALL_EXTERN(cerror)
+
+ MI_CALL_EXTERNAL(cerror)
+ li r3,-1 // get an error return code
+ stg r3,SF_LOCAL2(r1) // save return code in stack
+
/*
* 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(_fork)
+
+Lparent_return:
+ MI_CALL_EXTERNAL(__cthread_fork_parent)
+ lg r3,SF_LOCAL2(r1) // return -1 on error, child's pid on success
+
+Lreturn:
+ MI_POP_STACK_FRAME_AND_RETURN
projects / apple / libc.git / blobdiff