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体验新版 GitCode,发现更多精彩内容 >>
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d6f0f22c
编写于
10月 14, 2010
作者:
C
Chris Metcalf
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电子邮件补丁
差异文件
arch/tile: update some comments to clarify register usage.
Signed-off-by:
N
Chris Metcalf
<
cmetcalf@tilera.com
>
上级
5592840b
变更
2
隐藏空白更改
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并排
Showing
2 changed file
with
6 addition
and
3 deletion
+6
-3
arch/tile/kernel/intvec_32.S
arch/tile/kernel/intvec_32.S
+2
-0
arch/tile/kernel/process.c
arch/tile/kernel/process.c
+4
-3
未找到文件。
arch/tile/kernel/intvec_32.S
浏览文件 @
d6f0f22c
...
...
@@ -1553,6 +1553,8 @@ STD_ENTRY(_sys_clone)
*
to
be
available
to
it
on
entry
.
It
does
not
modify
any
callee
-
save
*
registers
(
including
"lr"
)
.
It
does
not
check
what
PL
it
is
being
*
called
at
,
so
you
'd better not call it other than at PL0.
*
The
<
atomic
.
h
>
wrapper
assumes
it
only
clobbers
r20
-
r29
,
so
if
*
it
ever
is
necessary
to
use
more
registers
,
be
aware
.
*
*
It
does
not
use
the
stack
,
but
since
it
might
be
re
-
interrupted
by
*
a
page
fault
which
would
assume
the
stack
was
valid
,
it
does
...
...
arch/tile/kernel/process.c
浏览文件 @
d6f0f22c
...
...
@@ -214,9 +214,10 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
/*
* Copy the callee-saved registers from the passed pt_regs struct
* into the context-switch callee-saved registers area.
* We have to restore the callee-saved registers since we may
* be cloning a userspace task with userspace register state,
* and we won't be unwinding the same kernel frames to restore them.
* This way when we start the interrupt-return sequence, the
* callee-save registers will be correctly in registers, which
* is how we assume the compiler leaves them as we start doing
* the normal return-from-interrupt path after calling C code.
* Zero out the C ABI save area to mark the top of the stack.
*/
ksp
=
(
unsigned
long
)
childregs
;
...
...
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