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*
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*
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/* Copyright (c) 1992 NeXT Computer, Inc. All rights reserved.
*
* File: libc/ppc/sys/fork.s
*
* HISTORY
* 18-Nov-92 Ben Fathi (benf@next.com)
* Created from M88K sources
*
* 11-Jan-92 Peter King (king@next.com)
* Created from M68K sources
*/
/*
* All of the asm stubs in this file have been adjusted so the pre/post
* fork handlers and dyld fixup are done in C inside Libc. As such, Libc
* expects the __fork asm to fix up the return code to be -1, 0 or pid
* and errno if needed.
*/
#include "SYS.h"
#if defined(__i386__)
LEAF(___fork, 0)
subl $28, %esp // Align the stack, with 16 bytes of extra padding that we'll need
movl $ SYS_fork,%eax jnc L1 // jump if CF==0
CALL_EXTERN(cerror)
movl $-1,%eax
addl $28, %esp // restore the stack
ret
L1:
orl %edx,%edx // CF=OF=0, ZF set if zero result
jz L2 // parent, since r1 == 0 in parent, 1 in child
//child here...
xorl %eax,%eax // zero eax
REG_TO_EXTERN(%eax, __current_pid) addl $28, %esp // restore the stack
// parent ends up here skipping child portion
ret
#elif defined(__x86_64__)
LEAF(___fork, 0)
subq $24, %rsp // Align the stack, plus room for local storage
movl $ SYSCALL_CONSTRUCT_UNIX(SYS_fork),%eax jnc L1 // jump if CF==0
CALL_EXTERN(cerror)
movq $-1, %rax
addq $24, %rsp // restore the stack
ret
L1:
orl %edx,%edx // CF=OF=0, ZF set if zero result
jz L2 // parent, since r1 == 0 in parent, 1 in child
//child here...
xorq %rax, %rax
PICIFY(__current_pid)
movl %eax,(%r11)
L2:
// parent ends up here skipping child portion
addq $24, %rsp // restore the stack
ret
#else
#error Unsupported architecture
#endif