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bde2e918
编写于
6月 22, 2013
作者:
B
Bernard Xiong
浏览文件
操作
浏览文件
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差异文件
Merge pull request #108 from aozima/pulls
回收main函数所用的栈空间
上级
bee9103e
a2ff85c0
变更
9
隐藏空白更改
内联
并排
Showing
9 changed file
with
192 addition
and
111 deletion
+192
-111
libcpu/arm/cortex-m0/context_gcc.S
libcpu/arm/cortex-m0/context_gcc.S
+9
-0
libcpu/arm/cortex-m0/context_iar.S
libcpu/arm/cortex-m0/context_iar.S
+9
-0
libcpu/arm/cortex-m0/context_rvds.S
libcpu/arm/cortex-m0/context_rvds.S
+9
-0
libcpu/arm/cortex-m3/context_gcc.S
libcpu/arm/cortex-m3/context_gcc.S
+112
-103
libcpu/arm/cortex-m3/context_iar.S
libcpu/arm/cortex-m3/context_iar.S
+9
-0
libcpu/arm/cortex-m3/context_rvds.S
libcpu/arm/cortex-m3/context_rvds.S
+9
-0
libcpu/arm/cortex-m4/context_gcc.S
libcpu/arm/cortex-m4/context_gcc.S
+15
-6
libcpu/arm/cortex-m4/context_iar.S
libcpu/arm/cortex-m4/context_iar.S
+9
-0
libcpu/arm/cortex-m4/context_rvds.S
libcpu/arm/cortex-m4/context_rvds.S
+11
-2
未找到文件。
libcpu/arm/cortex-m0/context_gcc.S
浏览文件 @
bde2e918
...
...
@@ -13,6 +13,7 @@
*
2012
-
06
-
01
aozima
set
pendsv
priority
to
0xFF
.
*
2012
-
08
-
17
aozima
fixed
bug
:
store
r8
-
r11
.
*
2013
-
02
-
20
aozima
port
to
gcc
.
*
2013
-
06
-
18
aozima
add
restore
MSP
feature
.
*/
.
cpu
cortex
-
m3
...
...
@@ -21,6 +22,7 @@
.
thumb
.
text
.
equ
SCB_VTOR
,
0xE000ED04
/*
Vector
Table
Offset
Register
*/
.
equ
ICSR
,
0xE000ED04
/*
interrupt
control
state
register
*/
.
equ
PENDSVSET_BIT
,
0x10000000
/*
value
to
trigger
PendSV
exception
*/
...
...
@@ -152,6 +154,13 @@ rt_hw_context_switch_to:
LDR
R1
,
=
PENDSVSET_BIT
STR
R1
,
[
R0
]
/
*
restore
MSP
*/
LDR
r0
,
=
SCB_VTOR
LDR
r0
,
[
r0
]
LDR
r0
,
[
r0
]
NOP
MSR
msp
,
r0
CPSIE
I
/*
enable
interrupts
at
processor
level
*/
/
*
never
reach
here
!
*/
...
...
libcpu/arm/cortex-m0/context_iar.S
浏览文件 @
bde2e918
...
...
@@ -12,6 +12,7 @@
; * 2010-01-25 Bernard first version
; * 2012-06-01 aozima set pendsv priority to 0xFF.
; * 2012-08-17 aozima fixed bug: store r8 - r11.
; * 2013-06-18 aozima add restore MSP feature.
; */
;/**
...
...
@@ -19,6 +20,7 @@
; */
;/*@{*/
SCB_VTOR
EQU
0xE000ED08
; Vector Table Offset Register
NVIC_INT_CTRL
EQU
0xE000ED04
; interrupt control state register
NVIC_SHPR3
EQU
0xE000ED20
; system priority register (2)
NVIC_PENDSV_PRI
EQU
0x00FF0000
; PendSV priority value (lowest)
...
...
@@ -178,6 +180,13 @@ rt_hw_context_switch_to:
STR
r1
,
[
r0
]
NOP
; restore MSP
LDR
r0
,
=
SCB_VTOR
LDR
r0
,
[
r0
]
LDR
r0
,
[
r0
]
NOP
MSR
msp
,
r0
; enable interrupts at processor level
CPSIE
I
...
...
libcpu/arm/cortex-m0/context_rvds.S
浏览文件 @
bde2e918
...
...
@@ -12,6 +12,7 @@
; * 2010-01-25 Bernard first version
; * 2012-06-01 aozima set pendsv priority to 0xFF.
; * 2012-08-17 aozima fixed bug: store r8 - r11.
; * 2013-06-18 aozima add restore MSP feature.
; */
;/**
...
...
@@ -19,6 +20,7 @@
; */
;/*@{*/
SCB_VTOR
EQU
0xE000ED08
; Vector Table Offset Register
NVIC_INT_CTRL
EQU
0xE000ED04
; interrupt control state register
NVIC_SHPR3
EQU
0xE000ED20
; system priority register (2)
NVIC_PENDSV_PRI
EQU
0x00FF0000
; PendSV priority value (lowest)
...
...
@@ -183,6 +185,13 @@ rt_hw_context_switch_to PROC
STR
r1
,
[
r0
]
NOP
; restore MSP
LDR
r0
,
=
SCB_VTOR
LDR
r0
,
[
r0
]
LDR
r0
,
[
r0
]
NOP
MSR
msp
,
r0
; enable interrupts at processor level
CPSIE
I
...
...
libcpu/arm/cortex-m3/context_gcc.S
浏览文件 @
bde2e918
...
...
@@ -10,161 +10,170 @@
*
Change
Logs
:
*
Date
Author
Notes
*
2009
-
10
-
11
Bernard
First
version
*
2010
-
12
-
29
onelife
Modify
for
EFM32
*
2011
-
06
-
17
onelife
Merge
all
of
the
assembly
source
code
into
context_gcc
.
S
*
2011
-
07
-
12
onelife
Add
interrupt
context
check
function
*
2010
-
12
-
29
onelife
Modify
for
EFM32
*
2011
-
06
-
17
onelife
Merge
all
of
the
assembly
source
code
into
context_gcc
.
S
*
2011
-
07
-
12
onelife
Add
interrupt
context
check
function
*
2013
-
06
-
18
aozima
add
restore
MSP
feature
.
*/
.
cpu
cortex
-
m3
.
fpu
softvfp
.
syntax
unified
.
thumb
.
text
.
equ
ICSR
,
0xE000ED04
/*
interrupt
control
state
register
*/
.
equ
PENDSVSET_BIT
,
0x10000000
/*
value
to
trigger
PendSV
exception
*/
.
equ
SHPR3
,
0xE000ED20
/*
system
priority
register
(
3
)
*/
.
equ
PENDSV_PRI_LOWEST
,
0x00FF0000
/*
PendSV
priority
value
(
lowest
)
*/
.
cpu
cortex
-
m3
.
fpu
softvfp
.
syntax
unified
.
thumb
.
text
.
equ
SCB_VTOR
,
0xE000ED04
/*
Vector
Table
Offset
Register
*/
.
equ
ICSR
,
0xE000ED04
/*
interrupt
control
state
register
*/
.
equ
PENDSVSET_BIT
,
0x10000000
/*
value
to
trigger
PendSV
exception
*/
.
equ
SHPR3
,
0xE000ED20
/*
system
priority
register
(
3
)
*/
.
equ
PENDSV_PRI_LOWEST
,
0x00FF0000
/*
PendSV
priority
value
(
lowest
)
*/
/*
*
rt_base_t
rt_hw_interrupt_disable
()
;
*/
.
global
rt_hw_interrupt_disable
.
type
rt_hw_interrupt_disable
,
%
function
.
global
rt_hw_interrupt_disable
.
type
rt_hw_interrupt_disable
,
%
function
rt_hw_interrupt_disable
:
MRS
R0
,
PRIMASK
CPSID
I
BX
LR
MRS
R0
,
PRIMASK
CPSID
I
BX
LR
/*
*
void
rt_hw_interrupt_enable
(
rt_base_t
level
)
;
*/
.
global
rt_hw_interrupt_enable
.
type
rt_hw_interrupt_enable
,
%
function
.
global
rt_hw_interrupt_enable
.
type
rt_hw_interrupt_enable
,
%
function
rt_hw_interrupt_enable
:
MSR
PRIMASK
,
R0
BX
LR
MSR
PRIMASK
,
R0
BX
LR
/*
*
void
rt_hw_context_switch
(
rt_uint32
from
,
rt_uint32
to
)
;
*
R0
-->
from
*
R1
-->
to
*/
.
global
rt_hw_context_switch_interrupt
.
type
rt_hw_context_switch_interrupt
,
%
function
.
global
rt_hw_context_switch
.
type
rt_hw_context_switch
,
%
function
.
global
rt_hw_context_switch_interrupt
.
type
rt_hw_context_switch_interrupt
,
%
function
.
global
rt_hw_context_switch
.
type
rt_hw_context_switch
,
%
function
rt_hw_context_switch_interrupt
:
rt_hw_context_switch
:
/
*
set
rt_thread_switch_interrupt_flag
to
1
*/
LDR
R2
,
=
rt_thread_switch_interrupt_flag
LDR
R3
,
[
R2
]
CMP
R3
,
#
1
BEQ
_reswitch
MOV
R3
,
#
1
STR
R3
,
[
R2
]
/
*
set
rt_thread_switch_interrupt_flag
to
1
*/
LDR
R2
,
=
rt_thread_switch_interrupt_flag
LDR
R3
,
[
R2
]
CMP
R3
,
#
1
BEQ
_reswitch
MOV
R3
,
#
1
STR
R3
,
[
R2
]
LDR
R2
,
=
rt_interrupt_from_thread
/*
set
rt_interrupt_from_thread
*/
STR
R0
,
[
R2
]
LDR
R2
,
=
rt_interrupt_from_thread
/*
set
rt_interrupt_from_thread
*/
STR
R0
,
[
R2
]
_reswitch
:
LDR
R2
,
=
rt_interrupt_to_thread
/*
set
rt_interrupt_to_thread
*/
STR
R1
,
[
R2
]
LDR
R2
,
=
rt_interrupt_to_thread
/*
set
rt_interrupt_to_thread
*/
STR
R1
,
[
R2
]
LDR
R0
,
=
ICSR
/*
trigger
the
PendSV
exception
(
causes
context
switch
)
*/
LDR
R1
,
=
PENDSVSET_BIT
STR
R1
,
[
R0
]
BX
LR
LDR
R0
,
=
ICSR
/*
trigger
the
PendSV
exception
(
causes
context
switch
)
*/
LDR
R1
,
=
PENDSVSET_BIT
STR
R1
,
[
R0
]
BX
LR
/*
R0
-->
swith
from
thread
stack
*
R1
-->
swith
to
thread
stack
*
psr
,
pc
,
LR
,
R12
,
R3
,
R2
,
R1
,
R0
are
pushed
into
[
from
]
stack
*/
.
global
PendSV_Handler
.
type
PendSV_Handler
,
%
function
.
global
PendSV_Handler
.
type
PendSV_Handler
,
%
function
PendSV_Handler
:
/
*
disable
interrupt
to
protect
context
switch
*/
MRS
R2
,
PRIMASK
CPSID
I
/
*
disable
interrupt
to
protect
context
switch
*/
MRS
R2
,
PRIMASK
CPSID
I
/
*
get
rt_thread_switch_interrupt_flag
*/
LDR
R0
,
=
rt_thread_switch_interrupt_flag
LDR
R1
,
[
R0
]
CBZ
R1
,
pendsv_exit
/*
pendsv
aLReady
handled
*/
/
*
get
rt_thread_switch_interrupt_flag
*/
LDR
R0
,
=
rt_thread_switch_interrupt_flag
LDR
R1
,
[
R0
]
CBZ
R1
,
pendsv_exit
/*
pendsv
aLReady
handled
*/
/
*
clear
rt_thread_switch_interrupt_flag
to
0
*/
MOV
R1
,
#
0
STR
R1
,
[
R0
]
/
*
clear
rt_thread_switch_interrupt_flag
to
0
*/
MOV
R1
,
#
0
STR
R1
,
[
R0
]
LDR
R0
,
=
rt_interrupt_from_thread
LDR
R1
,
[
R0
]
CBZ
R1
,
swtich_to_thread
/*
skip
register
save
at
the
first
time
*/
LDR
R0
,
=
rt_interrupt_from_thread
LDR
R1
,
[
R0
]
CBZ
R1
,
swtich_to_thread
/*
skip
register
save
at
the
first
time
*/
MRS
R1
,
PSP
/*
get
from
thread
stack
pointer
*/
STMFD
R1
!,
{
R4
-
R11
}
/*
push
R4
-
R11
register
*/
LDR
R0
,
[
R0
]
STR
R1
,
[
R0
]
/*
update
from
thread
stack
pointer
*/
MRS
R1
,
PSP
/*
get
from
thread
stack
pointer
*/
STMFD
R1
!,
{
R4
-
R11
}
/*
push
R4
-
R11
register
*/
LDR
R0
,
[
R0
]
STR
R1
,
[
R0
]
/*
update
from
thread
stack
pointer
*/
swtich_to_thread
:
LDR
R1
,
=
rt_interrupt_to_thread
LDR
R1
,
[
R1
]
LDR
R1
,
[
R1
]
/*
load
thread
stack
pointer
*/
LDR
R1
,
=
rt_interrupt_to_thread
LDR
R1
,
[
R1
]
LDR
R1
,
[
R1
]
/*
load
thread
stack
pointer
*/
LDMFD
R1
!,
{
R4
-
R11
}
/*
pop
R4
-
R11
register
*/
MSR
PSP
,
R1
/*
update
stack
pointer
*/
LDMFD
R1
!,
{
R4
-
R11
}
/*
pop
R4
-
R11
register
*/
MSR
PSP
,
R1
/*
update
stack
pointer
*/
pendsv_exit
:
/
*
restore
interrupt
*/
MSR
PRIMASK
,
R2
/
*
restore
interrupt
*/
MSR
PRIMASK
,
R2
ORR
LR
,
LR
,
#
0x04
BX
LR
ORR
LR
,
LR
,
#
0x04
BX
LR
/*
*
void
rt_hw_context_switch_to
(
rt_uint32
to
)
;
*
R0
-->
to
*/
.
global
rt_hw_context_switch_to
.
type
rt_hw_context_switch_to
,
%
function
.
global
rt_hw_context_switch_to
.
type
rt_hw_context_switch_to
,
%
function
rt_hw_context_switch_to
:
LDR
R1
,
=
rt_interrupt_to_thread
STR
R0
,
[
R1
]
LDR
R1
,
=
rt_interrupt_to_thread
STR
R0
,
[
R1
]
/
*
set
from
thread
to
0
*/
LDR
R1
,
=
rt_interrupt_from_thread
MOV
R0
,
#
0
STR
R0
,
[
R1
]
/
*
set
from
thread
to
0
*/
LDR
R1
,
=
rt_interrupt_from_thread
MOV
R0
,
#
0
STR
R0
,
[
R1
]
/
*
set
interrupt
flag
to
1
*/
LDR
R1
,
=
rt_thread_switch_interrupt_flag
MOV
R0
,
#
1
STR
R0
,
[
R1
]
/
*
set
interrupt
flag
to
1
*/
LDR
R1
,
=
rt_thread_switch_interrupt_flag
MOV
R0
,
#
1
STR
R0
,
[
R1
]
/
*
set
the
PendSV
exception
priority
*/
LDR
R0
,
=
SHPR3
LDR
R1
,
=
PENDSV_PRI_LOWEST
LDR.W
R2
,
[
R0
,#
0
]
/*
read
*/
ORR
R1
,
R1
,
R2
/*
modify
*/
STR
R1
,
[
R0
]
/*
write
-
back
*/
/
*
set
the
PendSV
exception
priority
*/
LDR
R0
,
=
SHPR3
LDR
R1
,
=
PENDSV_PRI_LOWEST
LDR.W
R2
,
[
R0
,#
0
]
/*
read
*/
ORR
R1
,
R1
,
R2
/*
modify
*/
STR
R1
,
[
R0
]
/*
write
-
back
*/
LDR
R0
,
=
ICSR
/*
trigger
the
PendSV
exception
(
causes
context
switch
)
*/
LDR
R1
,
=
PENDSVSET_BIT
STR
R1
,
[
R0
]
LDR
R0
,
=
ICSR
/*
trigger
the
PendSV
exception
(
causes
context
switch
)
*/
LDR
R1
,
=
PENDSVSET_BIT
STR
R1
,
[
R0
]
/
*
restore
MSP
*/
LDR
r0
,
=
SCB_VTOR
LDR
r0
,
[
r0
]
LDR
r0
,
[
r0
]
NOP
MSR
msp
,
r0
CPSIE
I
/*
enable
interrupts
at
processor
level
*/
CPSIE
I
/*
enable
interrupts
at
processor
level
*/
/
*
never
reach
here
!
*/
/
*
never
reach
here
!
*/
/*
compatible
with
old
version
*/
.
global
rt_hw_interrupt_thread_switch
.
type
rt_hw_interrupt_thread_switch
,
%
function
.
global
rt_hw_interrupt_thread_switch
.
type
rt_hw_interrupt_thread_switch
,
%
function
rt_hw_interrupt_thread_switch
:
BX
LR
NOP
BX
LR
NOP
.
global
HardFault_Handler
.
type
HardFault_Handler
,
%
function
.
global
HardFault_Handler
.
type
HardFault_Handler
,
%
function
HardFault_Handler
:
/
*
get
current
context
*/
MRS
R0
,
PSP
/*
get
fault
thread
stack
pointer
*/
...
...
@@ -179,8 +188,8 @@ HardFault_Handler:
*
rt_uint32_t
rt_hw_interrupt_check
(
void
)
;
*
R0
-->
state
*/
.
global
rt_hw_interrupt_check
.
type
rt_hw_interrupt_check
,
%
function
.
global
rt_hw_interrupt_check
.
type
rt_hw_interrupt_check
,
%
function
rt_hw_interrupt_check
:
MRS
R0
,
IPSR
BX
LR
MRS
R0
,
IPSR
BX
LR
libcpu/arm/cortex-m3/context_iar.S
浏览文件 @
bde2e918
...
...
@@ -11,6 +11,7 @@
; * Date Author Notes
; * 2009-01-17 Bernard first version
; * 2009-09-27 Bernard add protect when contex switch occurs
; * 2013-06-18 aozima add restore MSP feature.
; */
;/**
...
...
@@ -18,6 +19,7 @@
; */
;/*@{*/
SCB_VTOR
EQU
0xE000ED08
; Vector Table Offset Register
NVIC_INT_CTRL
EQU
0xE000ED04
; interrupt control state register
NVIC_SYSPRI2
EQU
0xE000ED20
; system priority register (2)
NVIC_PENDSV_PRI
EQU
0x00FF0000
; PendSV priority value (lowest)
...
...
@@ -151,6 +153,13 @@ rt_hw_context_switch_to:
LDR
r1
,
=
NVIC_PENDSVSET
STR
r1
,
[
r0
]
; restore MSP
LDR
r0
,
=
SCB_VTOR
LDR
r0
,
[
r0
]
LDR
r0
,
[
r0
]
NOP
MSR
msp
,
r0
CPSIE
I
; enable interrupts at processor level
; never reach here!
...
...
libcpu/arm/cortex-m3/context_rvds.S
浏览文件 @
bde2e918
...
...
@@ -10,6 +10,7 @@
; * Change Logs:
; * Date Author Notes
; * 2009-01-17 Bernard first version
; * 2013-06-18 aozima add restore MSP feature.
; */
;/**
...
...
@@ -17,6 +18,7 @@
; */
;/*@{*/
SCB_VTOR
EQU
0xE000ED08
; Vector Table Offset Register
NVIC_INT_CTRL
EQU
0xE000ED04
; interrupt control state register
NVIC_SYSPRI2
EQU
0xE000ED20
; system priority register (2)
NVIC_PENDSV_PRI
EQU
0x00FF0000
; PendSV priority value (lowest)
...
...
@@ -158,6 +160,13 @@ rt_hw_context_switch_to PROC
LDR
r1
,
=
NVIC_PENDSVSET
STR
r1
,
[
r0
]
; restore MSP
LDR
r0
,
=
SCB_VTOR
LDR
r0
,
[
r0
]
LDR
r0
,
[
r0
]
NOP
MSR
msp
,
r0
; enable interrupts at processor level
CPSIE
I
...
...
libcpu/arm/cortex-m4/context_gcc.S
浏览文件 @
bde2e918
...
...
@@ -11,6 +11,7 @@
*
Date
Author
Notes
*
2009
-
10
-
11
Bernard
first
version
*
2012
-
01
-
01
aozima
support
context
switch
load
/
store
FPU
register
.
*
2013
-
06
-
18
aozima
add
restore
MSP
feature
.
*/
/**
...
...
@@ -23,10 +24,11 @@
.
thumb
.
text
.
equ
NVIC_INT_CTRL
,
0xE000ED04
/*
interrupt
control
state
register
*/
.
equ
NVIC_SYSPRI2
,
0xE000ED20
/*
system
priority
register
(
2
)
*/
.
equ
NVIC_PENDSV_PRI
,
0x00FF0000
/*
PendSV
priority
value
(
lowest
)
*/
.
equ
NVIC_PENDSVSET
,
0x10000000
/*
value
to
trigger
PendSV
exception
*/
.
equ
SCB_VTOR
,
0xE000ED04
/*
Vector
Table
Offset
Register
*/
.
equ
NVIC_INT_CTRL
,
0xE000ED04
/*
interrupt
control
state
register
*/
.
equ
NVIC_SYSPRI2
,
0xE000ED20
/*
system
priority
register
(
2
)
*/
.
equ
NVIC_PENDSV_PRI
,
0x00FF0000
/*
PendSV
priority
value
(
lowest
)
*/
.
equ
NVIC_PENDSVSET
,
0x10000000
/*
value
to
trigger
PendSV
exception
*/
/*
*
rt_base_t
rt_hw_interrupt_disable
()
;
...
...
@@ -106,9 +108,9 @@ PendSV_Handler:
MRS
r1
,
psp
/*
get
from
thread
stack
pointer
*/
#if defined (__VFP_FP__) && !defined(__SOFTFP__)
VSTMDB
r1
!,
{
d8
-
d15
}
/*
push
FPU
register
s16
~
s31
*/
VSTMDB
r1
!,
{
d8
-
d15
}
/*
push
FPU
register
s16
~
s31
*/
#endif
STMFD
r1
!,
{
r4
-
r11
}
/*
push
r4
-
r11
register
*/
LDR
r0
,
[
r0
]
STR
r1
,
[
r0
]
/*
update
from
thread
stack
pointer
*/
...
...
@@ -164,6 +166,13 @@ rt_hw_context_switch_to:
LDR
r1
,
=
NVIC_PENDSVSET
STR
r1
,
[
r0
]
/
*
restore
MSP
*/
LDR
r0
,
=
SCB_VTOR
LDR
r0
,
[
r0
]
LDR
r0
,
[
r0
]
NOP
MSR
msp
,
r0
CPSIE
I
/*
enable
interrupts
at
processor
level
*/
/
*
never
reach
here
!
*/
...
...
libcpu/arm/cortex-m4/context_iar.S
浏览文件 @
bde2e918
...
...
@@ -12,6 +12,7 @@
; * 2009-01-17 Bernard first version
; * 2009-09-27 Bernard add protect when contex switch occurs
; * 2012-01-01 aozima support context switch load/store FPU register.
; * 2013-06-18 aozima add restore MSP feature.
; */
;/**
...
...
@@ -19,6 +20,7 @@
; */
;/*@{*/
SCB_VTOR
EQU
0xE000ED08
; Vector Table Offset Register
NVIC_INT_CTRL
EQU
0xE000ED04
; interrupt control state register
NVIC_SYSPRI2
EQU
0xE000ED20
; system priority register (2)
NVIC_PENDSV_PRI
EQU
0x00FF0000
; PendSV priority value (lowest)
...
...
@@ -162,6 +164,13 @@ rt_hw_context_switch_to:
LDR
r1
,
=
NVIC_PENDSVSET
STR
r1
,
[
r0
]
; restore MSP
LDR
r0
,
=
SCB_VTOR
LDR
r0
,
[
r0
]
LDR
r0
,
[
r0
]
NOP
MSR
msp
,
r0
CPSIE
I
; enable interrupts at processor level
; never reach here!
...
...
libcpu/arm/cortex-m4/context_rvds.S
浏览文件 @
bde2e918
...
...
@@ -11,6 +11,7 @@
; * Date Author Notes
; * 2009-01-17 Bernard first version.
; * 2012-01-01 aozima support context switch load/store FPU register.
; * 2013-06-18 aozima add restore MSP feature.
; */
;/**
...
...
@@ -18,6 +19,7 @@
; */
;/*@{*/
SCB_VTOR
EQU
0xE000ED08
; Vector Table Offset Register
NVIC_INT_CTRL
EQU
0xE000ED04
; interrupt control state register
NVIC_SYSPRI2
EQU
0xE000ED20
; system priority register (2)
NVIC_PENDSV_PRI
EQU
0x00FF0000
; PendSV priority value (lowest)
...
...
@@ -108,10 +110,10 @@ PendSV_Handler PROC
MRS
r1
,
psp
; get from thread stack pointer
IF
{FPU}
!=
"SoftVFP"
VSTMFD
r1
!,
{
d8
-
d15
}
; push FPU register s16~s31
VSTMFD
r1
!,
{
d8
-
d15
}
; push FPU register s16~s31
ENDIF
STMFD
r1
!,
{
r4
-
r11
}
; push r4 - r11 register
STMFD
r1
!,
{
r4
-
r11
}
; push r4 - r11 register
LDR
r0
,
[
r0
]
STR
r1
,
[
r0
]
; update from thread stack pointer
...
...
@@ -169,6 +171,13 @@ rt_hw_context_switch_to PROC
LDR
r1
,
=
NVIC_PENDSVSET
STR
r1
,
[
r0
]
; restore MSP
LDR
r0
,
=
SCB_VTOR
LDR
r0
,
[
r0
]
LDR
r0
,
[
r0
]
NOP
MSR
msp
,
r0
; enable interrupts at processor level
CPSIE
I
...
...
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