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87f1ca8f
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体验新版 GitCode,发现更多精彩内容 >>
提交
87f1ca8f
编写于
10月 21, 2012
作者:
A
Al Viro
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
s390: switch to generic fork/vfork/clone
Signed-off-by:
N
Al Viro
<
viro@zeniv.linux.org.uk
>
上级
f3268edb
变更
3
隐藏空白更改
内联
并排
Showing
3 changed file
with
14 addition
and
42 deletion
+14
-42
arch/s390/Kconfig
arch/s390/Kconfig
+1
-0
arch/s390/include/asm/unistd.h
arch/s390/include/asm/unistd.h
+3
-0
arch/s390/kernel/process.c
arch/s390/kernel/process.c
+10
-42
未找到文件。
arch/s390/Kconfig
浏览文件 @
87f1ca8f
...
...
@@ -141,6 +141,7 @@ config S390
select GENERIC_KERNEL_EXECVE
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
select CLONE_BACKWARDS2
config SCHED_OMIT_FRAME_POINTER
def_bool y
...
...
arch/s390/include/asm/unistd.h
浏览文件 @
87f1ca8f
...
...
@@ -54,6 +54,9 @@
# define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
# endif
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_SYS_FORK
#define __ARCH_WANT_SYS_VFORK
#define __ARCH_WANT_SYS_CLONE
/*
* "Conditional" syscalls
...
...
arch/s390/kernel/process.c
浏览文件 @
87f1ca8f
...
...
@@ -118,7 +118,7 @@ void release_thread(struct task_struct *dead_task)
int
copy_thread
(
unsigned
long
clone_flags
,
unsigned
long
new_stackp
,
unsigned
long
arg
,
struct
task_struct
*
p
,
struct
pt_regs
*
regs
)
struct
task_struct
*
p
,
struct
pt_regs
*
unused
)
{
struct
thread_info
*
ti
;
struct
fake_frame
...
...
@@ -150,7 +150,7 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
frame
->
sf
.
gprs
[
9
]
=
(
unsigned
long
)
frame
;
/* Store access registers to kernel stack of new process. */
if
(
unlikely
(
!
regs
))
{
if
(
unlikely
(
p
->
flags
&
PF_KTHREAD
))
{
/* kernel thread */
memset
(
&
frame
->
childregs
,
0
,
sizeof
(
struct
pt_regs
));
frame
->
childregs
.
psw
.
mask
=
psw_kernel_bits
|
PSW_MASK_DAT
|
...
...
@@ -164,9 +164,10 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
return
0
;
}
frame
->
childregs
=
*
regs
;
frame
->
childregs
=
*
current_pt_regs
()
;
frame
->
childregs
.
gprs
[
2
]
=
0
;
/* child returns 0 on fork. */
frame
->
childregs
.
gprs
[
15
]
=
new_stackp
;
if
(
new_stackp
)
frame
->
childregs
.
gprs
[
15
]
=
new_stackp
;
/* Don't copy runtime instrumentation info */
p
->
thread
.
ri_cb
=
NULL
;
...
...
@@ -183,57 +184,24 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
sizeof
(
s390_fp_regs
));
/* Set a new TLS ? */
if
(
clone_flags
&
CLONE_SETTLS
)
p
->
thread
.
acrs
[
0
]
=
regs
->
gprs
[
6
];
p
->
thread
.
acrs
[
0
]
=
frame
->
childregs
.
gprs
[
6
];
#else
/* CONFIG_64BIT */
/* Save the fpu registers to new thread structure. */
save_fp_regs
(
&
p
->
thread
.
fp_regs
);
/* Set a new TLS ? */
if
(
clone_flags
&
CLONE_SETTLS
)
{
unsigned
long
tls
=
frame
->
childregs
.
gprs
[
6
];
if
(
is_compat_task
())
{
p
->
thread
.
acrs
[
0
]
=
(
unsigned
int
)
regs
->
gprs
[
6
]
;
p
->
thread
.
acrs
[
0
]
=
(
unsigned
int
)
tls
;
}
else
{
p
->
thread
.
acrs
[
0
]
=
(
unsigned
int
)(
regs
->
gprs
[
6
]
>>
32
);
p
->
thread
.
acrs
[
1
]
=
(
unsigned
int
)
regs
->
gprs
[
6
]
;
p
->
thread
.
acrs
[
0
]
=
(
unsigned
int
)(
tls
>>
32
);
p
->
thread
.
acrs
[
1
]
=
(
unsigned
int
)
tls
;
}
}
#endif
/* CONFIG_64BIT */
return
0
;
}
SYSCALL_DEFINE0
(
fork
)
{
struct
pt_regs
*
regs
=
task_pt_regs
(
current
);
return
do_fork
(
SIGCHLD
,
regs
->
gprs
[
15
],
regs
,
0
,
NULL
,
NULL
);
}
SYSCALL_DEFINE4
(
clone
,
unsigned
long
,
newsp
,
unsigned
long
,
clone_flags
,
int
__user
*
,
parent_tidptr
,
int
__user
*
,
child_tidptr
)
{
struct
pt_regs
*
regs
=
task_pt_regs
(
current
);
if
(
!
newsp
)
newsp
=
regs
->
gprs
[
15
];
return
do_fork
(
clone_flags
,
newsp
,
regs
,
0
,
parent_tidptr
,
child_tidptr
);
}
/*
* This is trivial, and on the face of it looks like it
* could equally well be done in user mode.
*
* Not so, for quite unobvious reasons - register pressure.
* In user mode vfork() cannot have a stack frame, and if
* done by calling the "clone()" system call directly, you
* do not have enough call-clobbered registers to hold all
* the information you need.
*/
SYSCALL_DEFINE0
(
vfork
)
{
struct
pt_regs
*
regs
=
task_pt_regs
(
current
);
return
do_fork
(
CLONE_VFORK
|
CLONE_VM
|
SIGCHLD
,
regs
->
gprs
[
15
],
regs
,
0
,
NULL
,
NULL
);
}
asmlinkage
void
execve_tail
(
void
)
{
current
->
thread
.
fp_regs
.
fpc
=
0
;
...
...
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