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-rw-r--r--libc/sysdeps/linux/sh/vfork.S123
1 files changed, 123 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sh/vfork.S b/libc/sysdeps/linux/sh/vfork.S
new file mode 100644
index 000000000..6b20cc3bb
--- /dev/null
+++ b/libc/sysdeps/linux/sh/vfork.S
@@ -0,0 +1,123 @@
+/* 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 <sysdep.h>
+#define _ERRNO_H 1
+#include <bits/errno.h>
+
+/* 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. */
+
+.global errno
+
+ENTRY (__vfork)
+
+ mov.l @r15+,r3 // pop value from the stack
+ mov.l .L5,r1
+ mov.l r3,@r1 // save it in .sav_stack
+
+ mov.w .L3, r3
+
+#ifdef HIOS
+ trapa #0x28
+#else
+ trapa #0x10
+#endif
+
+ mov r0, r1
+// 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
+
+// mov #-12, r2
+// shad r2, r1
+ not r1, r1 // r1=0 means r0 = -1 to -4095
+ tst r1, r1 // i.e. error in linux
+ bf 1f
+ mov.w .L1, r1
+ cmp/eq r1, r0
+ bt 2f
+ mov.l .L2, r1
+ jmp @r1
+ mov r0, r4
+
+ .align 4
+
+1:
+ mov.l .L5,r1
+ mov.l @r1,r3 // get it from .sav_stack
+ mov.l r3,@-r15 // restore value to the stack
+
+ rts
+ nop
+
+ .align 4
+
+2:
+__syscall_error:
+ /* Store it in errno... */
+ mov.l .L4, r1
+ mov.l r0, @r1
+
+ mov.l .L5,r1
+ mov.l @r1,r3 // get it from .sav_stack
+ mov.l r3,@-r15 // restore value to the stack
+
+ /* And just kick back a -1. */
+ rts
+ mov #-1, r0
+
+ .align 4
+.L1:
+ .word -ENOSYS
+.L3:
+ .word 190 //__NR_vfork
+
+ .align 4 // Shouldn't be necessary as previously with have two words
+.L2:
+ .long __syscall_error
+
+.L4: .long errno
+
+.L5: .long .sav_stack
+
+ .data
+
+ .align 4
+
+.sav_stack: //area to temporary save the stach
+ .long 0
+
+.weak vfork
+vfork = __vfork