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
Message-ID <[email protected]>
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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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    <div id=3D"ygrp-text" >
=20=20=20=20=20=20
=20=20=20=20=20=20
      <p>I recently wrapped up an investigation of strange behavior in a cu=
stomer=E2=80=99s program on a Rabbit 3000 product. &nbsp;It took some time =
to track it down to using the&nbsp;OS_TASK_OPT_STK_CLR option with OSTaskCr=
eateExt(). &nbsp;Both Dynamic C 9 and 10 were erasing the wrong memory area=
.. &nbsp;<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. &nbsp;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. &nbsp;This change will be a part of the Dynamic C =
10.72E installer whenever we release it. &nbsp;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>&#43;++ 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 &#43;439,6 @@</span></font></div><div class><font face=3D"Consolas"=
 size=3D"2" class><span style=3D"font-style: normal;" class>&nbsp; &nbsp; &=
nbsp;auto INT8U &nbsp; &nbsp;err;</span></font></div><div class><font face=
=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal;" class>&n=
bsp; &nbsp; &nbsp;auto INT16U &nbsp; i;</span></font></div><div class><font=
 face=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal;" cla=
ss>&nbsp; &nbsp; &nbsp;auto INT16U &nbsp; pbos;</span></font></div><div cla=
ss><font face=3D"Consolas" size=3D"2" class><span style=3D"font-style: norm=
al;" class>- &nbsp; &nbsp;auto INT8U &nbsp; &nbsp;upper_nibble;</span></fon=
t></div><div class><font face=3D"Consolas" size=3D"2" class><span style=3D"=
font-style: normal;" class>- &nbsp; &nbsp;auto INT16U &nbsp; lower_16;</spa=
n></font></div><div class><font face=3D"Consolas" size=3D"2" class><span st=
yle=3D"font-style: normal;" class>&nbsp; &nbsp; &nbsp;auto INT16U &nbsp; st=
k_size;</span></font></div><div class><font face=3D"Consolas" size=3D"2" cl=
ass><span style=3D"font-style: normal;" class>&nbsp; &nbsp; &nbsp;auto INT3=
2U &nbsp; 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 &#43;458,9 @@</span></font></div=
><div class><font face=3D"Consolas" size=3D"2" class><span style=3D"font-st=
yle: normal;" class>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (opt &amp; OS_TASK=
_OPT_STK_CHK) { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;// 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>&nbsp; &nbsp; &nbsp;=
 &nbsp; &nbsp; &nbsp; &nbsp;if (opt &amp; OS_TASK_OPT_STK_CLR) { &nbsp; &nb=
sp; &nbsp;// 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>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nb=
sp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &=
nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &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; &nbsp; &nbsp; &nbsp; &nbsp; &=
nbsp; &nbsp; &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>- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;upper=
_nibble =3D (INT8U)(PhysAddr &gt;&gt; 16);</span></font></div><div class><f=
ont face=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal;" =
class>- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;for (i =3D s=
tk_size; i &gt; 0; i--) {</span></font></div><div class><font face=3D"Conso=
las" size=3D"2" class><span style=3D"font-style: normal;" class>- &nbsp; &n=
bsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;#asm</span></fo=
nt></div><div class><font face=3D"Consolas" size=3D"2" class><span style=3D=
"font-style: normal;" class>- &nbsp;<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&#43;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> &nbsp; &nbsp; &nbsp; &nbsp; &nb=
sp; &nbsp; &nbsp; &nbsp; &nbsp; ld &nbsp; a,(hl)<span class=3D"Apple-tab-sp=
an" style=3D"white-space:pre;">	</span> &nbsp; &nbsp; &nbsp; &nbsp; ;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&#43;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>- &nbsp; &nb=
sp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;ld &nbsp;=
 hl,(hl)<span class=3D"Apple-tab-span" style=3D"white-space:pre;">	</span> =
&nbsp; &nbsp; &nbsp; &nbsp; ;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>- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbs=
p; &nbsp; &nbsp;push ix</span></font></div><div class><font face=3D"Consola=
s" size=3D"2" class><span style=3D"font-style: normal;" class>- &nbsp; &nbs=
p; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;ld &nbsp; =
ix,hl &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;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; &nbsp; &nbsp; &nbsp; &=
nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;bool hl</span></font></div><=
div class><font face=3D"Consolas" size=3D"2" class><span style=3D"font-styl=
e: normal;" class>- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=
 &nbsp; &nbsp; &nbsp;ld &nbsp; l,h &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp=
; &nbsp; ;zero hl</span></font></div><div class><font face=3D"Consolas" siz=
e=3D"2" class><span style=3D"font-style: normal;" class>- &nbsp; &nbsp; &nb=
sp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;ldp &nbsp;(ix),h=
l &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;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; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &=
nbsp; &nbsp; &nbsp; &nbsp;pop &nbsp;ix</span></font></div><div class><font =
face=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal;" clas=
s>- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;#e=
ndasm</span></font></div><div class><font face=3D"Consolas" size=3D"2" clas=
s><span style=3D"font-style: normal;" class>- &nbsp; &nbsp; &nbsp; &nbsp; &=
nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;lower_16--;</span></font></div><div=
 class><font face=3D"Consolas" size=3D"2" class><span style=3D"font-style: =
normal;" class>- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;}</=
span></font></div><div class><font face=3D"Consolas" size=3D"2" class><span=
 style=3D"font-style: normal;" class>+ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &=
nbsp; &nbsp; &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>+ &nbsp; &nbsp; &nbsp; &n=
bsp; &nbsp; &nbsp; &nbsp; &nbsp;// 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>+ &nbsp; &nbs=
p; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;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>&nbsp; &nbsp; &nbsp;=
 &nbsp; &nbsp; &nbsp; &nbsp;}</span></font></div><div class><font face=3D"C=
onsolas" size=3D"2" class><span style=3D"font-style: normal;" class>&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;}</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>&#43;++ 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 &#43;479,9 @@</span></font></div><div class><=
font face=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal;"=
 class>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (opt &amp; OS_TASK_OPT_STK_CHK)=
 { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;// 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>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp=
; &nbsp; &nbsp;if (opt &amp; OS_TASK_OPT_STK_CLR) { &nbsp; &nbsp; &nbsp;// =
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; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp=
; &nbsp; &nbsp; &nbsp; &nbsp;// 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>- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp=
; &nbsp;_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>+ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=
 &nbsp; &nbsp;// 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>+ &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;// 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>+ &nbsp; &nbsp; &n=
bsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;_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; &=
nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;}</span></font></div><div class><fo=
nt face=3D"Consolas" size=3D"2" class><span style=3D"font-style: normal;" c=
lass>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;}</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>

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