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Kirill Smelkov
linux
Commits
a58d5360
Commit
a58d5360
authored
21 years ago
by
Richard Henderson
Browse files
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Plain Diff
[ALPHA] Implement execve entirely in assembly. Force KSP to
the top of the kernel stack space before entering userland.
parent
e01b34d6
Changes
3
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Showing
3 changed files
with
48 additions
and
23 deletions
+48
-23
arch/alpha/kernel/alpha_ksyms.c
arch/alpha/kernel/alpha_ksyms.c
+1
-1
arch/alpha/kernel/entry.S
arch/alpha/kernel/entry.S
+46
-15
include/asm-alpha/unistd.h
include/asm-alpha/unistd.h
+1
-7
No files found.
arch/alpha/kernel/alpha_ksyms.c
View file @
a58d5360
...
@@ -156,7 +156,7 @@ EXPORT_SYMBOL(sys_exit);
...
@@ -156,7 +156,7 @@ EXPORT_SYMBOL(sys_exit);
EXPORT_SYMBOL
(
sys_write
);
EXPORT_SYMBOL
(
sys_write
);
EXPORT_SYMBOL
(
sys_read
);
EXPORT_SYMBOL
(
sys_read
);
EXPORT_SYMBOL
(
sys_lseek
);
EXPORT_SYMBOL
(
sys_lseek
);
EXPORT_SYMBOL
(
__kernel_
execve
);
EXPORT_SYMBOL
(
execve
);
EXPORT_SYMBOL
(
sys_setsid
);
EXPORT_SYMBOL
(
sys_setsid
);
EXPORT_SYMBOL
(
sys_wait4
);
EXPORT_SYMBOL
(
sys_wait4
);
...
...
This diff is collapsed.
Click to expand it.
arch/alpha/kernel/entry.S
View file @
a58d5360
...
@@ -606,7 +606,8 @@ ret_from_fork:
...
@@ -606,7 +606,8 @@ ret_from_fork:
.
globl
kernel_thread
.
globl
kernel_thread
.
ent
kernel_thread
.
ent
kernel_thread
kernel_thread
:
kernel_thread
:
ldgp
$gp
,
0
(
$
27
)
/*
we
can
be
called
from
a
module
*/
/
*
We
can
be
called
from
a
module
.
*/
ldgp
$gp
,
0
(
$
27
)
.
prologue
1
.
prologue
1
subq
$sp
,
SP_OFF
+
6
*
8
,
$sp
subq
$sp
,
SP_OFF
+
6
*
8
,
$sp
br
$
1
,
2
f
/*
load
start
address
*/
br
$
1
,
2
f
/*
load
start
address
*/
...
@@ -654,26 +655,56 @@ kernel_thread:
...
@@ -654,26 +655,56 @@ kernel_thread:
.
end
kernel_thread
.
end
kernel_thread
/*
/*
*
__kernel_execve
(
path
,
argv
,
envp
,
regs
)
*
execve
(
path
,
argv
,
envp
)
*/
*/
.
align
4
.
align
4
.
globl
__kernel_execve
.
globl
execve
.
ent
__kernel_execve
.
ent
execve
__kernel_execve
:
execve
:
ldgp
$gp
,
0
(
$
27
)
/*
we
can
be
called
from
modules
.
*/
/
*
We
can
be
called
from
a
module
.
*/
subq
$sp
,
16
,
$sp
ldgp
$gp
,
0
(
$
27
)
.
frame
$sp
,
16
,
$
26
,
0
lda
$sp
,
-(
32
+
SIZEOF_PT_REGS
+
8
)(
$sp
)
.
frame
$sp
,
32
+
SIZEOF_PT_REGS
+
8
,
$
26
,
0
stq
$
26
,
0
(
$sp
)
stq
$
26
,
0
(
$sp
)
stq
$
19
,
8
(
$sp
)
stq
$
16
,
8
(
$sp
)
stq
$
17
,
16
(
$sp
)
stq
$
18
,
24
(
$sp
)
.
prologue
1
.
prologue
1
jsr
$
26
,
do_execve
bne
$
0
,
1
f
/*
error
!
*/
lda
$
16
,
32
(
$sp
)
ldq
$sp
,
8
(
$sp
)
lda
$
17
,
0
lda
$
18
,
SIZEOF_PT_REGS
bsr
$
26
,
memset
!
samegp
/
*
Avoid
the
HAE
being
gratuitously
wrong
,
which
would
cause
us
to
do
the
whole
turn
off
interrupts
thing
and
restore
it
.
*/
ldq
$
2
,
alpha_mv
+
HAE_CACHE
stq
$
2
,
152
+
32
(
$sp
)
ldq
$
16
,
8
(
$sp
)
ldq
$
17
,
16
(
$sp
)
ldq
$
18
,
24
(
$sp
)
lda
$
19
,
32
(
$sp
)
bsr
$
26
,
do_execve
!
samegp
ldq
$
26
,
0
(
$sp
)
bne
$
0
,
1
f
/*
error
!
*/
/
*
Move
the
temporary
pt_regs
struct
from
its
current
location
to
the
top
of
the
kernel
stack
frame
.
See
copy_thread
for
details
for
a
normal
process
.
*/
lda
$
16
,
0x4000
-
SIZEOF_PT_REGS
(
$
8
)
lda
$
17
,
32
(
$sp
)
lda
$
18
,
SIZEOF_PT_REGS
bsr
$
26
,
memmove
!
samegp
/
*
Take
that
over
as
our
new
stack
frame
and
visit
userland
!
*/
lda
$sp
,
0x4000
-
SIZEOF_PT_REGS
(
$
8
)
br
$
31
,
ret_from_sys_call
br
$
31
,
ret_from_sys_call
1
:
ldq
$
26
,
0
(
$sp
)
addq
$sp
,
16
,
$sp
1
:
lda
$sp
,
32
+
SIZEOF_PT_REGS
+
8
(
$sp
)
ret
ret
.
end
__kernel_
execve
.
end
execve
/*
/*
...
...
This diff is collapsed.
Click to expand it.
include/asm-alpha/unistd.h
View file @
a58d5360
...
@@ -593,13 +593,7 @@ static inline long read(int fd, char * buf, size_t nr)
...
@@ -593,13 +593,7 @@ static inline long read(int fd, char * buf, size_t nr)
return
sys_read
(
fd
,
buf
,
nr
);
return
sys_read
(
fd
,
buf
,
nr
);
}
}
extern
int
__kernel_execve
(
char
*
,
char
**
,
char
**
,
struct
pt_regs
*
);
extern
long
execve
(
char
*
,
char
**
,
char
**
);
static
inline
long
execve
(
char
*
file
,
char
**
argvp
,
char
**
envp
)
{
struct
pt_regs
regs
;
memset
(
&
regs
,
0
,
sizeof
(
regs
));
return
__kernel_execve
(
file
,
argvp
,
envp
,
&
regs
);
}
extern
long
sys_setsid
(
void
);
extern
long
sys_setsid
(
void
);
static
inline
long
setsid
(
void
)
static
inline
long
setsid
(
void
)
...
...
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Click to expand it.
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