Bug when using OS_TASK_OPT_STK_CLR with OSTaskCreateExt()
"Tom Collins tom-lnEA/wrDJtNWk0Htik3J/[email protected] [rabbit-semi]" <[email protected]> Fri, 14 Jun 2019 13:34:56 -0700
| Newsgroups | gmane.comp.hardware.rabbit-semiconductor |
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I recently wrapped up an investigation of strange behavior in a customer=E2=
=80=99s program on a Rabbit 3000 product. It took some time to track it do=
wn to using the OS_TASK_OPT_STK_CLR option with OSTaskCreateExt(). Both Dy=
namic C 9 and 10 were erasing the wrong memory area.=20=20
In the case of Dynamic C 9, it was inefficiently using 16-bit writes and ul=
timately erasing one byte beyond the end of the stack allocated for the tas=
k. In this customer=E2=80=99s situation, a stack ending at 0x6FFFF would e=
nd up erasing the byte at 0x60000 due to usage of the LDP opcode.
In Dynamic C 10, it calculated the incorrect starting address for the stack=
, and would erase one byte before the stack and leave the last byte untouch=
ed.
Due to licensing issues, Digi International wasn=E2=80=99t able to include =
the uC/OS-II source code in the GitHub repository when they released Dynami=
c C libraries and samples as Open Source. This change will be a part of th=
e Dynamic C 10.72E installer whenever we release it. I intend to include i=
t as a patch on GitHub for both Dynamic C 9 and 10.
Here=E2=80=99s the patch for Dynamic C 9:
--- a/Lib/UCOS2/OS_TASK.C
+++ b/Lib/UCOS2/OS_TASK.C
@@ -439,8 +439,6 @@
auto INT8U err;
auto INT16U i;
auto INT16U pbos;
- auto INT8U upper_nibble;
- auto INT16U lower_16;
auto INT16U stk_size;
auto INT32U PhysAddr;
@@ -460,25 +458,9 @@
if (opt & OS_TASK_OPT_STK_CHK) { // See if stack checking=
has been enabled
if (opt & OS_TASK_OPT_STK_CLR) { // See if stack needs to=
be cleared
// Yes, fill the stack w=
ith zeros
- lower_16 =3D (INT16U)PhysAddr;
- upper_nibble =3D (INT8U)(PhysAddr >> 16);
- for (i =3D stk_size; i > 0; i--) {
- #asm
- ld hl,@sp+upper_nibble
- add hl,sp
- ld a,(hl) ;a gets high nibble
- ld hl,@sp+lower_16
- add hl,sp
- ld hl,(hl) ;hl has lower 16 bits
- push ix
- ld ix,hl ;a:ix 20-bit phys addr for st=
ack
- bool hl
- ld l,h ;zero hl
- ldp (ix),hl ;write zero into stack
- pop ix
- #endasm
- lower_16--;
- }
+ // PhysAddr is the last address of the stack (e.g., ...FF)=
, so it's
+ // necessary to add 1 to get to the starting address of th=
e stack.
+ xmemset(PhysAddr - stk_size + 1, 0, stk_size);
}
}
And for Dynamic C 10:
--- a/Lib/Rabbit4000/UCOS2/OS_TASK.C
+++ b/Lib/Rabbit4000/UCOS2/OS_TASK.C
@@ -479,7 +479,9 @@
if (opt & OS_TASK_OPT_STK_CHK) { // See if stack checking=
has been enabled
if (opt & OS_TASK_OPT_STK_CLR) { // See if stack needs to=
be cleared
// Yes, fill the stack w=
ith zeros
- _f_memset((void __far *)(PhysAddr - stk_size), 0, stk_size=
);
+ // PhysAddr is the last address of the stack (e.g., ...FF)=
, so it's
+ // necessary to add 1 to get to the starting address of th=
e stack.
+ _f_memset((void __far *)(PhysAddr - stk_size + 1), 0, stk_=
size);
}
}
Please let me know if you have any questions about the original bug, or the=
patches.
-Tom
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<p>I recently wrapped up an investigation of strange behavior in a cu=
stomer=E2=80=99s program on a Rabbit 3000 product. It took some time =
to track it down to using the OS_TASK_OPT_STK_CLR option with OSTaskCr=
eateExt(). Both Dynamic C 9 and 10 were erasing the wrong memory area=
.. <div class><br class></div><div class>In the case of Dynamic C 9, i=
t was inefficiently using 16-bit writes and ultimately erasing one byte bey=
ond the end of the stack allocated for the task. In this customer=E2=
=80=99s situation, a stack ending at 0x6FFFF would end up erasing the byte =
at 0x60000 due to usage of the LDP opcode.</div><div class><br class></div>=
<div class>In Dynamic C 10, it calculated the incorrect starting address fo=
r the stack, and would erase one byte before the stack and leave the last b=
yte untouched.</div><div class><br class></div><div class>Due to licensing =
issues, Digi International wasn=E2=80=99t able to include the uC/OS-II sour=
ce code in the GitHub repository when they released Dynamic C libraries and=
samples as Open Source. This change will be a part of the Dynamic C =
10.72E installer whenever we release it. I intend to include it as a =
patch on GitHub for both Dynamic C 9 and 10.</div><div class><br class></di=
v><div class>Here=E2=80=99s the patch for Dynamic C 9:</div><div class><div=
class><font face=3D"Consolas" size=3D"2" class><span style=3D"font-style: =
normal;" class>--- a/Lib/UCOS2/OS_TASK.C</span></font></div><div class><fon=
t face=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal;" cl=
ass>+++ b/Lib/UCOS2/OS_TASK.C</span></font></div><div class><font face=
=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal;" class>@@=
-439,8 +439,6 @@</span></font></div><div class><font face=3D"Consolas"=
size=3D"2" class><span style=3D"font-style: normal;" class> &=
nbsp;auto INT8U err;</span></font></div><div class><font face=
=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal;" class>&n=
bsp; auto INT16U i;</span></font></div><div class><font=
face=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal;" cla=
ss> auto INT16U pbos;</span></font></div><div cla=
ss><font face=3D"Consolas" size=3D"2" class><span style=3D"font-style: norm=
al;" class>- auto INT8U upper_nibble;</span></fon=
t></div><div class><font face=3D"Consolas" size=3D"2" class><span style=3D"=
font-style: normal;" class>- auto INT16U lower_16;</spa=
n></font></div><div class><font face=3D"Consolas" size=3D"2" class><span st=
yle=3D"font-style: normal;" class> auto INT16U st=
k_size;</span></font></div><div class><font face=3D"Consolas" size=3D"2" cl=
ass><span style=3D"font-style: normal;" class> auto INT3=
2U PhysAddr;</span></font></div><div class><font face=3D"Consolas" s=
ize=3D"2" class><span style=3D"font-style: normal;" class><br class></span>=
</font></div><div class><font face=3D"Consolas" size=3D"2" class><span styl=
e=3D"font-style: normal;" class>@@ -460,25 +458,9 @@</span></font></div=
><div class><font face=3D"Consolas" size=3D"2" class><span style=3D"font-st=
yle: normal;" class> if (opt & OS_TASK=
_OPT_STK_CHK) { // See if stack checking =
has been enabled</span></font></div><div class><font face=3D"Consolas" size=
=3D"2" class><span style=3D"font-style: normal;" class> =
if (opt & OS_TASK_OPT_STK_CLR) { &nb=
sp; // See if stack needs to be cleared</span></font></div><div class=
><font face=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal=
;" class> &nb=
sp; &=
nbsp; // Yes, fill the stack with zeros</=
span></font></div><div class><font face=3D"Consolas" size=3D"2" class><span=
style=3D"font-style: normal;" class>- &=
nbsp; lower_16 =3D (INT16U)PhysAddr;</span></font></div><div c=
lass><font face=3D"Consolas" size=3D"2" class><span style=3D"font-style: no=
rmal;" class>- upper=
_nibble =3D (INT8U)(PhysAddr >> 16);</span></font></div><div class><f=
ont face=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal;" =
class>- for (i =3D s=
tk_size; i > 0; i--) {</span></font></div><div class><font face=3D"Conso=
las" size=3D"2" class><span style=3D"font-style: normal;" class>- &n=
bsp; #asm</span></fo=
nt></div><div class><font face=3D"Consolas" size=3D"2" class><span style=3D=
"font-style: normal;" class>- <span class=3D"Apple-tab-span" style=3D=
"white-space:pre;"> </span> ld<span class=3D"Apple-tab-span" style=3D=
"white-space:pre;"> </span>hl,@sp+upper_nibble</span></font></div><div =
class><font face=3D"Consolas" size=3D"2" class><span style=3D"font-style: n=
ormal;" class>-<span class=3D"Apple-tab-span" style=3D"white-space:pre;"> =
</span> add<span class=3D"Apple-tab-span" style=3D"white-space:pre;"> =
</span>hl,sp</span></font></div><div class><font face=3D"Consolas" size=3D"=
2" class><span style=3D"font-style: normal;" class>-<span class=3D"Apple-ta=
b-span" style=3D"white-space:pre;"> </span> &nb=
sp; ld a,(hl)<span class=3D"Apple-tab-sp=
an" style=3D"white-space:pre;"> </span> ;a gets=
high nibble</span></font></div><div class><font face=3D"Consolas" size=3D"=
2" class><span style=3D"font-style: normal;" class>-<span class=3D"Apple-ta=
b-span" style=3D"white-space:pre;"> </span> ld<span class=3D"Apple-ta=
b-span" style=3D"white-space:pre;"> </span>hl,@sp+lower_16</span></font=
></div><div class><font face=3D"Consolas" size=3D"2" class><span style=3D"f=
ont-style: normal;" class>-<span class=3D"Apple-tab-span" style=3D"white-sp=
ace:pre;"> </span> add<span class=3D"Apple-tab-span" style=3D"white-s=
pace:pre;"> </span>hl,sp</span></font></div><div class><font face=3D"Consol=
as" size=3D"2" class><span style=3D"font-style: normal;" class>- &nb=
sp; ld =
hl,(hl)<span class=3D"Apple-tab-span" style=3D"white-space:pre;"> </span> =
;hl has lower 16 bits</span></font></div><div c=
lass><font face=3D"Consolas" size=3D"2" class><span style=3D"font-style: no=
rmal;" class>- &nbs=
p; push ix</span></font></div><div class><font face=3D"Consola=
s" size=3D"2" class><span style=3D"font-style: normal;" class>- &nbs=
p; ld =
ix,hl ;a:ix 20-bit phys addr for =
stack</span></font></div><div class><font face=3D"Consolas" size=3D"2" clas=
s><span style=3D"font-style: normal;" class>- &=
nbsp; bool hl</span></font></div><=
div class><font face=3D"Consolas" size=3D"2" class><span style=3D"font-styl=
e: normal;" class>- =
ld l,h  =
; ;zero hl</span></font></div><div class><font face=3D"Consolas" siz=
e=3D"2" class><span style=3D"font-style: normal;" class>- &nb=
sp; ldp (ix),h=
l ;write zero into stack</span></font></=
div><div class><font face=3D"Consolas" size=3D"2" class><span style=3D"font=
-style: normal;" class>- &=
nbsp; pop ix</span></font></div><div class><font =
face=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal;" clas=
s>- #e=
ndasm</span></font></div><div class><font face=3D"Consolas" size=3D"2" clas=
s><span style=3D"font-style: normal;" class>- &=
nbsp; lower_16--;</span></font></div><div=
class><font face=3D"Consolas" size=3D"2" class><span style=3D"font-style: =
normal;" class>- }</=
span></font></div><div class><font face=3D"Consolas" size=3D"2" class><span=
style=3D"font-style: normal;" class>+ &=
nbsp; // PhysAddr is the last address of the stack (e.g., ...F=
F), so it's</span></font></div><div class><font face=3D"Consolas" size=3D"2=
" class><span style=3D"font-style: normal;" class>+ &n=
bsp; // necessary to add 1 to get to the startin=
g address of the stack.</span></font></div><div class><font face=3D"Consola=
s" size=3D"2" class><span style=3D"font-style: normal;" class>+ &nbs=
p; xmemset(PhysAddr - stk_size + 1=
, 0, stk_size);</span></font></div><div class><font face=3D"Consolas" size=
=3D"2" class><span style=3D"font-style: normal;" class> =
}</span></font></div><div class><font face=3D"C=
onsolas" size=3D"2" class><span style=3D"font-style: normal;" class> =
}</span></font></div><div class><font face=3D"Co=
nsolas" size=3D"2" class><span style=3D"font-style: normal;" class><br clas=
s></span></font></div><div class><br class></div><div class><span style=3D"=
font-style: normal;" class>And for Dynamic C 10:</span></div><div class><di=
v class><font face=3D"Consolas" size=3D"2" class><span style=3D"font-style:=
normal;" class>--- a/Lib/Rabbit4000/UCOS2/OS_TASK.C</span></font></div><di=
v class><font face=3D"Consolas" size=3D"2" class><span style=3D"font-style:=
normal;" class>+++ b/Lib/Rabbit4000/UCOS2/OS_TASK.C</span></font></div=
><div class><font face=3D"Consolas" size=3D"2" class><span style=3D"font-st=
yle: normal;" class>@@ -479,7 +479,9 @@</span></font></div><div class><=
font face=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal;"=
class> if (opt & OS_TASK_OPT_STK_CHK)=
{ // See if stack checking has been enab=
led</span></font></div><div class><font face=3D"Consolas" size=3D"2" class>=
<span style=3D"font-style: normal;" class>  =
; if (opt & OS_TASK_OPT_STK_CLR) { // =
See if stack needs to be cleared</span></font></div><div class><font face=
=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal;" class>&n=
bsp; =
 =
; // Yes, fill the stack with zeros</span></font=
></div><div class><font face=3D"Consolas" size=3D"2" class><span style=3D"f=
ont-style: normal;" class>-  =
; _f_memset((void __far *)(PhysAddr - stk_size), 0, stk_size);</span>=
</font></div><div class><font face=3D"Consolas" size=3D"2" class><span styl=
e=3D"font-style: normal;" class>+ =
// PhysAddr is the last address of the stack (e.g., ...FF), s=
o it's</span></font></div><div class><font face=3D"Consolas" size=3D"2" cla=
ss><span style=3D"font-style: normal;" class>+ =
// necessary to add 1 to get to the starting add=
ress of the stack.</span></font></div><div class><font face=3D"Consolas" si=
ze=3D"2" class><span style=3D"font-style: normal;" class>+ &n=
bsp; _f_memset((void __far *)(PhysAddr - =
stk_size + 1), 0, stk_size);</span></font></div><div class><font face=3D"Co=
nsolas" size=3D"2" class><span style=3D"font-style: normal;" class> &=
nbsp; }</span></font></div><div class><fo=
nt face=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal;" c=
lass> }</span></font></div><div class><fon=
t face=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal;" cl=
ass><br class></span></font></div></div><div class><br class></div><div cla=
ss>Please let me know if you have any questions about the original bug, or =
the patches.</div><div class><br class><div class>
<span class=3D"Apple-style-span" style=3D"border-collapse: separate;"><div =
class>-Tom</div><br class=3D"Apple-interchange-newline"></span>
</div>
<br class></div></div></p>
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