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[/] [or1k_old/] [trunk/] [linux/] [uClibc/] [libc/] [sysdeps/] [linux/] [sh/] [vfork.S] - Blame information for rev 1765

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/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
   Copyright (C) 2001 Hewlett-Packard Australia
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU Library General Public License as published by the Free
 Software Foundation; either version 2 of the License, or (at your option) any
 later version.
 
 This program is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more
 details.
 
 You should have received a copy of the GNU Library General Public License
 along with this program; if not, write to the Free Software Foundation, Inc.,
 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 
 Derived in part from the Linux-8086 C library, the GNU C Library, and several
 other sundry sources.  Files within this library are copyright by their
 respective copyright holders.
*/
 
#include 
#define _SYSCALL_H
#include 
#define _ERRNO_H        1
#include 
 
/* Clone the calling process, but without copying the whole address space.
   The calling process is suspended until the new process exits or is
   replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
   and the process ID of the new process to the old process.  */
 
.text
.align 4
.type   __vfork,@function
.globl  __vfork;
__vfork:
        mov.w   .L2, r3
        trapa   #0x10
        mov     r0, r1
#ifdef __sh2__
// 12 arithmetic shifts for the crappy sh2, because shad doesn't exist!
        shar    r1
        shar    r1
        shar    r1
        shar    r1
        shar    r1
        shar    r1
        shar    r1
        shar    r1
        shar    r1
        shar    r1
        shar    r1
        shar    r1
#else
        mov     #-12, r2
        shad    r2, r1
#endif
 
        not     r1, r1                  // r1=0 means r0 = -1 to -4095
        tst     r1, r1                  // i.e. error in linux
        bf      2f
        mov.w   .L1, r1
        cmp/eq  r1, r0
        bf/s    __syscall_error
         mov    r0, r4
 
        /* If we don't have vfork, use fork.  */
        mov.w   .L3, r3
        trapa   #0x10
        mov     r0, r1
#ifdef __sh2__
// 12 arithmetic shifts for the crappy sh2, because shad doesn't exist!
        shar    r1
        shar    r1
        shar    r1
        shar    r1
        shar    r1
        shar    r1
        shar    r1
        shar    r1
        shar    r1
        shar    r1
        shar    r1
        shar    r1
#else
        mov     #-12, r2
        shad    r2, r1
#endif
 
        not     r1, r1                  // r1=0 means r0 = -1 to -4095
        tst     r1, r1                  // i.e. error in linux
        bt/s    __syscall_error
         mov    r0, r4
2:
        rts
         nop
 
        .align  2
.L1:
        .word   -ENOSYS
.L2:
        .word   __NR_vfork
.L3:
        .word   __NR_fork
        .size   __vfork, .-__vfork
.weak   vfork
        vfork =  __vfork
 
#include "syscall_error.S"
 

Line No.	Rev	Author	Line
1	1325	phoenix	`/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.`
2			`Copyright (C) 2001 Hewlett-Packard Australia`
3
4			`This program is free software; you can redistribute it and/or modify it under`
5			`the terms of the GNU Library General Public License as published by the Free`
6			`Software Foundation; either version 2 of the License, or (at your option) any`
7			`later version.`
8
9			`This program is distributed in the hope that it will be useful, but WITHOUT`
10			`ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS`
11			`FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more`
12			`details.`
13
14			`You should have received a copy of the GNU Library General Public License`
15			`along with this program; if not, write to the Free Software Foundation, Inc.,`
16			`59 Temple Place, Suite 330, Boston, MA 02111-1307 USA`
17
18			`Derived in part from the Linux-8086 C library, the GNU C Library, and several`
19			`other sundry sources. Files within this library are copyright by their`
20			`respective copyright holders.`
21			`*/`
22
23			`#include`
24			`#define _SYSCALL_H`
25			`#include`
26			`#define _ERRNO_H 1`
27			`#include`
28
29			`/* Clone the calling process, but without copying the whole address space.`
30			`The calling process is suspended until the new process exits or is`
31			replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
32			`and the process ID of the new process to the old process. */`
33
34			`.text`
35			`.align 4`
36			`.type __vfork,@function`
37			`.globl __vfork;`
38			`__vfork:`
39			`mov.w .L2, r3`
40			`trapa #0x10`
41			`mov r0, r1`
42			`#ifdef __sh2__`
43			`// 12 arithmetic shifts for the crappy sh2, because shad doesn't exist!`
44			`shar r1`
45			`shar r1`
46			`shar r1`
47			`shar r1`
48			`shar r1`
49			`shar r1`
50			`shar r1`
51			`shar r1`
52			`shar r1`
53			`shar r1`
54			`shar r1`
55			`shar r1`
56			`#else`
57			`mov #-12, r2`
58			`shad r2, r1`
59			`#endif`
60
61			`not r1, r1 // r1=0 means r0 = -1 to -4095`
62			`tst r1, r1 // i.e. error in linux`
63			`bf 2f`
64			`mov.w .L1, r1`
65			`cmp/eq r1, r0`
66			`bf/s __syscall_error`
67			`mov r0, r4`
68
69			`/* If we don't have vfork, use fork. */`
70			`mov.w .L3, r3`
71			`trapa #0x10`
72			`mov r0, r1`
73			`#ifdef __sh2__`
74			`// 12 arithmetic shifts for the crappy sh2, because shad doesn't exist!`
75			`shar r1`
76			`shar r1`
77			`shar r1`
78			`shar r1`
79			`shar r1`
80			`shar r1`
81			`shar r1`
82			`shar r1`
83			`shar r1`
84			`shar r1`
85			`shar r1`
86			`shar r1`
87			`#else`
88			`mov #-12, r2`
89			`shad r2, r1`
90			`#endif`
91
92			`not r1, r1 // r1=0 means r0 = -1 to -4095`
93			`tst r1, r1 // i.e. error in linux`
94			`bt/s __syscall_error`
95			`mov r0, r4`
96			`2:`
97			`rts`
98			`nop`
99
100			`.align 2`
101			`.L1:`
102			`.word -ENOSYS`
103			`.L2:`
104			`.word __NR_vfork`
105			`.L3:`
106			`.word __NR_fork`
107			`.size __vfork, .-__vfork`
108			`.weak vfork`
109			`vfork = __vfork`
110
111			`#include "syscall_error.S"`
112

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[/] [or1k_old/] [trunk/] [linux/] [uClibc/] [libc/] [sysdeps/] [linux/] [sh/] [vfork.S] - Blame information for rev 1765