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nexedi
linux
Commits
b9763ce3
Commit
b9763ce3
authored
Oct 21, 2012
by
Al Viro
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frv: switch to generic fork/vfork/clone
Signed-off-by:
Al Viro
<
viro@zeniv.linux.org.uk
>
parent
0bcfe540
Changes
2
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2 changed files
with
8 additions
and
40 deletions
+8
-40
arch/frv/include/asm/unistd.h
arch/frv/include/asm/unistd.h
+3
-0
arch/frv/kernel/process.c
arch/frv/kernel/process.c
+5
-40
No files found.
arch/frv/include/asm/unistd.h
View file @
b9763ce3
...
...
@@ -30,6 +30,9 @@
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_SYS_FORK
#define __ARCH_WANT_SYS_VFORK
#define __ARCH_WANT_SYS_CLONE
/*
* "Conditional" syscalls
...
...
arch/frv/kernel/process.c
View file @
b9763ce3
...
...
@@ -139,42 +139,12 @@ inline unsigned long user_stack(const struct pt_regs *regs)
return
user_mode
(
regs
)
?
regs
->
sp
:
0
;
}
asmlinkage
int
sys_fork
(
void
)
{
#ifndef CONFIG_MMU
/* fork almost works, enough to trick you into looking elsewhere:-( */
return
-
EINVAL
;
#else
return
do_fork
(
SIGCHLD
,
user_stack
(
__frame
),
__frame
,
0
,
NULL
,
NULL
);
#endif
}
asmlinkage
int
sys_vfork
(
void
)
{
return
do_fork
(
CLONE_VFORK
|
CLONE_VM
|
SIGCHLD
,
user_stack
(
__frame
),
__frame
,
0
,
NULL
,
NULL
);
}
/*****************************************************************************/
/*
* clone a process
* - tlsptr is retrieved by copy_thread()
*/
asmlinkage
int
sys_clone
(
unsigned
long
clone_flags
,
unsigned
long
newsp
,
int
__user
*
parent_tidptr
,
int
__user
*
child_tidptr
,
int
__user
*
tlsptr
)
{
if
(
!
newsp
)
newsp
=
user_stack
(
__frame
);
return
do_fork
(
clone_flags
,
newsp
,
__frame
,
0
,
parent_tidptr
,
child_tidptr
);
}
/* end sys_clone() */
/*
* set up the kernel stack and exception frames for a new process
*/
int
copy_thread
(
unsigned
long
clone_flags
,
unsigned
long
usp
,
unsigned
long
arg
,
struct
task_struct
*
p
,
struct
pt_regs
*
regs
)
struct
task_struct
*
p
,
struct
pt_regs
*
unused
)
{
struct
pt_regs
*
childregs
;
...
...
@@ -182,9 +152,7 @@ int copy_thread(unsigned long clone_flags,
(
task_stack_page
(
p
)
+
THREAD_SIZE
-
FRV_FRAME0_SIZE
);
/* set up the userspace frame (the only place that the USP is stored) */
*
childregs
=
*
__kernel_frame0_ptr
;
p
->
set_child_tid
=
p
->
clear_child_tid
=
NULL
;
*
childregs
=
*
current_pt_regs
();
p
->
thread
.
frame
=
childregs
;
p
->
thread
.
curr
=
p
;
...
...
@@ -193,18 +161,15 @@ int copy_thread(unsigned long clone_flags,
p
->
thread
.
lr
=
0
;
p
->
thread
.
frame0
=
childregs
;
if
(
unlikely
(
!
regs
))
{
if
(
unlikely
(
p
->
flags
&
PF_KTHREAD
))
{
childregs
->
gr9
=
usp
;
/* function */
childregs
->
gr8
=
arg
;
p
->
thread
.
pc
=
(
unsigned
long
)
ret_from_kernel_thread
;
save_user_regs
(
p
->
thread
.
user
);
return
0
;
}
/* set up the userspace frame (the only place that the USP is stored) */
*
childregs
=
*
regs
;
childregs
->
sp
=
usp
;
if
(
usp
)
childregs
->
sp
=
usp
;
childregs
->
next_frame
=
NULL
;
p
->
thread
.
pc
=
(
unsigned
long
)
ret_from_fork
;
...
...
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