Re: Bug when using OS_TASK_OPT_STK_CLR with OSTaskCreateExt()

"Steve Trigero seecwriter-/[email protected] [rabbit-semi]" <[email protected]> Mon, 17 Jun 2019 19:58:14 +0000 (UTC)
Newsgroups gmane.comp.hardware.rabbit-semiconductor
Message-ID <[email protected]>
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 Tom,
Is this only an issue when using uC/OS?
Steve
    On =E2=80=8EFriday=E2=80=8E, =E2=80=8EJune=E2=80=8E =E2=80=8E14=E2=80=
=8E, =E2=80=8E2019=E2=80=8E =E2=80=8E01=E2=80=8E:=E2=80=8E35=E2=80=8E:=E2=
=80=8E18=E2=80=8E =E2=80=8EPM=E2=80=8E =E2=80=8EPDT, Tom Collins tom@tomlog=
ic.com [rabbit-semi] <[email protected]> wrote:=20=20
=20
 =C2=A0=20=20=20
I recently wrapped up an investigation of strange behavior in a customer=E2=
=80=99s program on a Rabbit 3000 product. =C2=A0It took some time to track =
it down to using the=C2=A0OS_TASK_OPT_STK_CLR option with OSTaskCreateExt()=
.. =C2=A0Both Dynamic C 9 and 10 were erasing the wrong memory area.. =C2=A0

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. =C2=A0In this customer=E2=80=99s situation, a stack ending at 0x6FFFF wo=
uld end 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. =C2=A0This change will be a part =
of the Dynamic C 10.72E installer whenever we release it. =C2=A0I intend to=
 include it 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 @@=C2=A0 =C2=A0 =C2=A0auto INT8U =C2=A0 =
=C2=A0err;=C2=A0 =C2=A0 =C2=A0auto INT16U =C2=A0 i;=C2=A0 =C2=A0 =C2=A0auto=
 INT16U =C2=A0 pbos;- =C2=A0 =C2=A0auto INT8U =C2=A0 =C2=A0upper_nibble;- =
=C2=A0 =C2=A0auto INT16U =C2=A0 lower_16;=C2=A0 =C2=A0 =C2=A0auto INT16U =
=C2=A0 stk_size;=C2=A0 =C2=A0 =C2=A0auto INT32U =C2=A0 PhysAddr;
@@ -460,25 +458,9 @@=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0if (opt & OS_TASK_OPT=
_STK_CHK) { =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0// See if stack checking has =
been enabled=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0if (opt & OS_TA=
SK_OPT_STK_CLR) { =C2=A0 =C2=A0 =C2=A0// See if stack needs to be cleared=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0// Yes, fill the stack with zeros- =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0lower_16 =3D (INT16U)PhysA=
ddr;- =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0upper_nibble =
=3D (INT8U)(PhysAddr >> 16);- =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0for (i =3D stk_size; i > 0; i--) {- =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0#asm- =C2=A0  ld hl,@sp+upper_nibb=
le-  add hl,sp-  =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 ld =C2=A0 a,(hl)  =C2=A0 =C2=A0 =C2=A0 =C2=A0 ;a gets high nibble-  =
ld hl,@sp+lower_16-  add hl,sp- =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ld =C2=A0 hl,(hl)  =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 ;hl has lower 16 bits- =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0push ix- =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ld =C2=A0 ix,hl =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 ;a:ix 20-bit phys addr for stack- =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0bool hl- =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ld=
 =C2=A0 l,h =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ;zero hl- =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ld=
p =C2=A0(ix),hl =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ;write zero into stack- =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0pop =C2=A0ix- =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0#endasm- =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0lower_16--;- =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0}+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0// Phys=
Addr is the last address of the stack (e.g., ...FF), so it's+ =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0// necessary to add 1 to get to t=
he starting address of the stack.+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0xmemset(PhysAddr - stk_size + 1, 0, stk_size);=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0}=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0}

And for Dynamic C 10:--- a/Lib/Rabbit4000/UCOS2/OS_TASK.C+++ b/Lib/Rabbit40=
00/UCOS2/OS_TASK.C@@ -479,7 +479,9 @@=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0if (=
opt & OS_TASK_OPT_STK_CHK) { =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0// See if st=
ack checking has been enabled=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0if (opt & OS_TASK_OPT_STK_CLR) { =C2=A0 =C2=A0 =C2=A0// See if stack nee=
ds to be cleared=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0// Yes, fill the stack with=
 zeros- =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0_f_memset((v=
oid __far *)(PhysAddr - stk_size), 0, stk_size);+ =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0// PhysAddr is the last address of the stack=
 (e.g., ...FF), so it's+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0// necessary to add 1 to get to the starting address of the stack.+ =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0_f_memset((void __fa=
r *)(PhysAddr - stk_size + 1), 0, stk_size);=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0}=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0}

Please let me know if you have any questions about the original bug, or the=
 patches.
-Tom

=20=20=20=20
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    <div id=3D"ygrp-text" >
=20=20=20=20=20=20
=20=20=20=20=20=20
      <p><div class=3D"ydp6cc53ba1yahoo-style-wrap" style=3D"font-family: t=
imes new roman,new york,times,serif;font-size: 16px;"></div><div class=3D"y=
dp6cc53ba1yahoo-style-wrap" style=3D"font-family: times new roman,new york,=
times,serif;font-size: 16px;">
        </div><div class=3D"ydp6cc53ba1yahoo-style-wrap" style=3D"font-fami=
ly: times new roman,new york,times,serif;font-size: 16px;">Tom,</div><div c=
lass=3D"ydp6cc53ba1yahoo-style-wrap" style=3D"font-family: times new roman,=
new york,times,serif;font-size: 16px;"><br></div><div class=3D"ydp6cc53ba1y=
ahoo-style-wrap" style=3D"font-family: times new roman,new york,times,serif=
;font-size: 16px;">Is this only an issue when using uC/OS?</div><div class=
=3D"ydp6cc53ba1yahoo-style-wrap" style=3D"font-family: times new roman,new =
york,times,serif;font-size: 16px;"><br></div><div class=3D"ydp6cc53ba1yahoo=
-style-wrap" style=3D"font-family: times new roman,new york,times,serif;fon=
t-size: 16px;">Steve</div><div class=3D"ydp6cc53ba1yahoo-style-wrap" style=
=3D"font-family: times new roman,new york,times,serif;font-size: 16px;"><br=
></div><div class=3D"ydp6cc53ba1yahoo-style-wrap" style=3D"font-family: tim=
es new roman,new york,times,serif;font-size: 16px;">
=20=20=20=20=20=20=20=20
        </div><div class=3D"ydpc7805dc8yahoo_quoted" id=3D"ydpc7805dc8yahoo=
_quoted_1324582705">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
                <div>
                    On =E2=80=8EFriday=E2=80=8E, =E2=80=8EJune=E2=80=8E =E2=
=80=8E14=E2=80=8E, =E2=80=8E2019=E2=80=8E =E2=80=8E01=E2=80=8E:=E2=80=8E35=
=E2=80=8E:=E2=80=8E18=E2=80=8E =E2=80=8EPM=E2=80=8E =E2=80=8EPDT, Tom Colli=
ns tom-lnEA/wrDJtNWk0Htik3J/[email protected] [rabbit-semi] &lt;[email protected]&gt; wrote=
:
                </div>
                <div><br></div>
                <div><br></div>
                <div><div id=3D"ydpc7805dc8yiv1007472175"><div>
<span>&nbsp;</span>


<div id=3D"ydpc7805dc8yiv1007472175ygrp-mlmsg">
  <div id=3D"ydpc7805dc8yiv1007472175ygrp-msg">


    <div id=3D"ydpc7805dc8yiv1007472175ygrp-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;</p><div class=3D"ydpc7805dc8yiv1007472175class"><br class=3D"ydpc=
7805dc8yiv1007472175class" clear=3D"none"></div><div class=3D"ydpc7805dc8yi=
v1007472175class">In the case of Dynamic C 9, it was inefficiently using 16=
-bit writes and ultimately erasing one byte beyond the end of the stack all=
ocated for the task. &nbsp;In this customer=E2=80=99s situation, a stack en=
ding at 0x6FFFF would end up erasing the byte at 0x60000 due to usage of th=
e LDP opcode.</div><div class=3D"ydpc7805dc8yiv1007472175class"><br class=
=3D"ydpc7805dc8yiv1007472175class" clear=3D"none"></div><div class=3D"ydpc7=
805dc8yiv1007472175class">In Dynamic C 10, it calculated the incorrect star=
ting address for the stack, and would erase one byte before the stack and l=
eave the last byte untouched.</div><div class=3D"ydpc7805dc8yiv1007472175cl=
ass"><br class=3D"ydpc7805dc8yiv1007472175class" clear=3D"none"></div><div =
class=3D"ydpc7805dc8yiv1007472175class">Due to licensing issues, Digi Inter=
national wasn=E2=80=99t able to include the uC/OS-II source code in the Git=
Hub repository when they released Dynamic C libraries and samples as Open S=
ource. &nbsp;This change will be a part of the Dynamic C 10.72E installer w=
henever we release it. &nbsp;I intend to include it as a patch on GitHub fo=
r both Dynamic C 9 and 10.</div><div class=3D"ydpc7805dc8yiv1007472175class=
"><br class=3D"ydpc7805dc8yiv1007472175class" clear=3D"none"></div><div cla=
ss=3D"ydpc7805dc8yiv1007472175class">Here=E2=80=99s the patch for Dynamic C=
 9:</div><div class=3D"ydpc7805dc8yiv1007472175class"><div class=3D"ydpc780=
5dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv1007472175class" face=
=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv1007472175class" styl=
e=3D"font-style:normal;">--- a/Lib/UCOS2/OS_TASK.C</span></font></div><div =
class=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv100747=
2175class" face=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv100747=
2175class" style=3D"font-style:normal;">&#43;++ b/Lib/UCOS2/OS_TASK.C</span=
></font></div><div class=3D"ydpc7805dc8yiv1007472175class"><font class=3D"y=
dpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><span class=3D"y=
dpc7805dc8yiv1007472175class" style=3D"font-style:normal;">@@ -439,8 &#43;4=
39,6 @@</span></font></div><div class=3D"ydpc7805dc8yiv1007472175class"><fo=
nt class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><sp=
an class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:normal;">&nb=
sp; &nbsp; &nbsp;auto INT8U &nbsp; &nbsp;err;</span></font></div><div class=
=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv1007472175c=
lass" face=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv1007472175c=
lass" style=3D"font-style:normal;">&nbsp; &nbsp; &nbsp;auto INT16U &nbsp; i=
;</span></font></div><div class=3D"ydpc7805dc8yiv1007472175class"><font cla=
ss=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><span cla=
ss=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:normal;">&nbsp; &n=
bsp; &nbsp;auto INT16U &nbsp; pbos;</span></font></div><div class=3D"ydpc78=
05dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv1007472175class" face=
=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv1007472175class" styl=
e=3D"font-style:normal;">- &nbsp; &nbsp;auto INT8U &nbsp; &nbsp;upper_nibbl=
e;</span></font></div><div class=3D"ydpc7805dc8yiv1007472175class"><font cl=
ass=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><span cl=
ass=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:normal;">- &nbsp;=
 &nbsp;auto INT16U &nbsp; lower_16;</span></font></div><div class=3D"ydpc78=
05dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv1007472175class" face=
=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv1007472175class" styl=
e=3D"font-style:normal;">&nbsp; &nbsp; &nbsp;auto INT16U &nbsp; stk_size;</=
span></font></div><div class=3D"ydpc7805dc8yiv1007472175class"><font class=
=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><span class=
=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:normal;">&nbsp; &nbs=
p; &nbsp;auto INT32U &nbsp; PhysAddr;</span></font></div><div class=3D"ydpc=
7805dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv1007472175class" fa=
ce=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv1007472175class" st=
yle=3D"font-style:normal;"><br class=3D"ydpc7805dc8yiv1007472175class" clea=
r=3D"none"></span></font></div><div class=3D"ydpc7805dc8yiv1007472175class"=
><font class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"=
><span class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:normal;"=
>@@ -460,25 &#43;458,9 @@</span></font></div><div class=3D"ydpc7805dc8yiv10=
07472175class"><font class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consol=
as" size=3D"2"><span class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-=
style:normal;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (opt &amp; OS_TASK_OPT_=
STK_CHK) { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;// See if stack checking has b=
een enabled</span></font></div><div class=3D"ydpc7805dc8yiv1007472175class"=
><font class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"=
><span class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:normal;"=
>&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=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydpc=
7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><span class=3D"ydpc=
7805dc8yiv1007472175class" style=3D"font-style:normal;">&nbsp; &nbsp; &nbsp=
; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nb=
sp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &=
nbsp; &nbsp;// Yes, fill the stack with zeros</span></font></div><div class=
=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv1007472175c=
lass" face=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv1007472175c=
lass" style=3D"font-style:normal;">- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nb=
sp; &nbsp; &nbsp;lower_16 =3D (INT16U)PhysAddr;</span></font></div><div cla=
ss=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv100747217=
5class" face=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv100747217=
5class" style=3D"font-style:normal;">- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &=
nbsp; &nbsp; &nbsp;upper_nibble =3D (INT8U)(PhysAddr &gt;&gt; 16);</span></=
font></div><div class=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydpc=
7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><span class=3D"ydpc=
7805dc8yiv1007472175class" style=3D"font-style:normal;">- &nbsp; &nbsp; &nb=
sp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;for (i =3D stk_size; i &gt; 0; i--) {=
</span></font></div><div class=3D"ydpc7805dc8yiv1007472175class"><font clas=
s=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><span clas=
s=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:normal;">- &nbsp; &=
nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;#asm</span></f=
ont></div><div class=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydpc7=
805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><span class=3D"ydpc7=
805dc8yiv1007472175class" style=3D"font-style:normal;">- &nbsp;<span class=
=3D"ydpc7805dc8yiv1007472175Apple-tab-span" style=3D"white-space: pre-wrap;=
">							</span> ld<span class=3D"ydpc7805dc8yiv1007472175Apple-tab-span" s=
tyle=3D"white-space: pre-wrap;">	</span>hl,@sp&#43;upper_nibble</span></fon=
t></div><div class=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydpc780=
5dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><span class=3D"ydpc780=
5dc8yiv1007472175class" style=3D"font-style:normal;">-<span class=3D"ydpc78=
05dc8yiv1007472175Apple-tab-span" style=3D"white-space: pre-wrap;">							<=
/span> add<span class=3D"ydpc7805dc8yiv1007472175Apple-tab-span" style=3D"w=
hite-space: pre-wrap;">	</span>hl,sp</span></font></div><div class=3D"ydpc7=
805dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv1007472175class" fac=
e=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv1007472175class" sty=
le=3D"font-style:normal;">-<span class=3D"ydpc7805dc8yiv1007472175Apple-tab=
-span" style=3D"white-space: pre-wrap;">	</span> &nbsp; &nbsp; &nbsp; &nbsp=
; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ld &nbsp; a,(hl)<span class=3D"ydpc780=
5dc8yiv1007472175Apple-tab-span" style=3D"white-space: pre-wrap;">	</span> =
&nbsp; &nbsp; &nbsp; &nbsp; ;a gets high nibble</span></font></div><div cla=
ss=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv100747217=
5class" face=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv100747217=
5class" style=3D"font-style:normal;">-<span class=3D"ydpc7805dc8yiv10074721=
75Apple-tab-span" style=3D"white-space: pre-wrap;">							</span> ld<span c=
lass=3D"ydpc7805dc8yiv1007472175Apple-tab-span" style=3D"white-space: pre-w=
rap;">	</span>hl,@sp&#43;lower_16</span></font></div><div class=3D"ydpc7805=
dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv1007472175class" face=
=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv1007472175class" styl=
e=3D"font-style:normal;">-<span class=3D"ydpc7805dc8yiv1007472175Apple-tab-=
span" style=3D"white-space: pre-wrap;">							</span> add<span class=3D"ydp=
c7805dc8yiv1007472175Apple-tab-span" style=3D"white-space: pre-wrap;">	</sp=
an>hl,sp</span></font></div><div class=3D"ydpc7805dc8yiv1007472175class"><f=
ont class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><s=
pan class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:normal;">- =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp=
;ld &nbsp; hl,(hl)<span class=3D"ydpc7805dc8yiv1007472175Apple-tab-span" st=
yle=3D"white-space: pre-wrap;">	</span> &nbsp; &nbsp; &nbsp; &nbsp; ;hl has=
 lower 16 bits</span></font></div><div class=3D"ydpc7805dc8yiv1007472175cla=
ss"><font class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D=
"2"><span class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:norma=
l;">- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=
 &nbsp;push ix</span></font></div><div class=3D"ydpc7805dc8yiv1007472175cla=
ss"><font class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D=
"2"><span class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:norma=
l;">- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=
 &nbsp;ld &nbsp; ix,hl &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;a:ix 20-b=
it phys addr for stack</span></font></div><div class=3D"ydpc7805dc8yiv10074=
72175class"><font class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas"=
 size=3D"2"><span class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-sty=
le:normal;">- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp=
; &nbsp; &nbsp;bool hl</span></font></div><div class=3D"ydpc7805dc8yiv10074=
72175class"><font class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas"=
 size=3D"2"><span class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-sty=
le:normal;">- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp=
; &nbsp; &nbsp;ld &nbsp; l,h &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbs=
p; ;zero hl</span></font></div><div class=3D"ydpc7805dc8yiv1007472175class"=
><font class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"=
><span class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:normal;"=
>- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &n=
bsp;ldp &nbsp;(ix),hl &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ;write zero into s=
tack</span></font></div><div class=3D"ydpc7805dc8yiv1007472175class"><font =
class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><span =
class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:normal;">- &nbs=
p; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;pop=
 &nbsp;ix</span></font></div><div class=3D"ydpc7805dc8yiv1007472175class"><=
font class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><=
span class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:normal;">-=
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;#enda=
sm</span></font></div><div class=3D"ydpc7805dc8yiv1007472175class"><font cl=
ass=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><span cl=
ass=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:normal;">- &nbsp;=
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;lower_16--;<=
/span></font></div><div class=3D"ydpc7805dc8yiv1007472175class"><font class=
=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><span class=
=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:normal;">- &nbsp; &n=
bsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;}</span></font></div><div cla=
ss=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv100747217=
5class" face=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv100747217=
5class" style=3D"font-style:normal;">+ &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=3D"ydpc7805dc8yiv1007472175class"=
><font class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"=
><span class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:normal;"=
>+ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;// necessary to a=
dd 1 to get to the starting address of the stack.</span></font></div><div c=
lass=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv1007472=
175class" face=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv1007472=
175class" style=3D"font-style:normal;">+ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=
 &nbsp; &nbsp; &nbsp;xmemset(PhysAddr - stk_size + 1, 0, stk_size);</span><=
/font></div><div class=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydp=
c7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><span class=3D"ydp=
c7805dc8yiv1007472175class" style=3D"font-style:normal;">&nbsp; &nbsp; &nbs=
p; &nbsp; &nbsp; &nbsp; &nbsp;}</span></font></div><div class=3D"ydpc7805dc=
8yiv1007472175class"><font class=3D"ydpc7805dc8yiv1007472175class" face=3D"=
Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv1007472175class" style=3D=
"font-style:normal;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;}</span></font></div=
><div class=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv=
1007472175class" face=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv=
1007472175class" style=3D"font-style:normal;"><br class=3D"ydpc7805dc8yiv10=
07472175class" clear=3D"none"></span></font></div><div class=3D"ydpc7805dc8=
yiv1007472175class"><br class=3D"ydpc7805dc8yiv1007472175class" clear=3D"no=
ne"></div><div class=3D"ydpc7805dc8yiv1007472175class"><span class=3D"ydpc7=
805dc8yiv1007472175class" style=3D"font-style:normal;">And for Dynamic C 10=
:</span></div><div class=3D"ydpc7805dc8yiv1007472175class"><div class=3D"yd=
pc7805dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv1007472175class" =
face=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv1007472175class" =
style=3D"font-style:normal;">--- a/Lib/Rabbit4000/UCOS2/OS_TASK.C</span></f=
ont></div><div class=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydpc7=
805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><span class=3D"ydpc7=
805dc8yiv1007472175class" style=3D"font-style:normal;">&#43;++ b/Lib/Rabbit=
4000/UCOS2/OS_TASK.C</span></font></div><div class=3D"ydpc7805dc8yiv1007472=
175class"><font class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" s=
ize=3D"2"><span class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style=
:normal;">@@ -479,7 &#43;479,9 @@</span></font></div><div class=3D"ydpc7805=
dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv1007472175class" face=
=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv1007472175class" styl=
e=3D"font-style:normal;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (opt &amp; OS=
_TASK_OPT_STK_CHK) { &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;// See if stack chec=
king has been enabled</span></font></div><div class=3D"ydpc7805dc8yiv100747=
2175class"><font class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" =
size=3D"2"><span class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-styl=
e:normal;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (opt &amp; OS=
_TASK_OPT_STK_CLR) { &nbsp; &nbsp; &nbsp;// See if stack needs to be cleare=
d</span></font></div><div class=3D"ydpc7805dc8yiv1007472175class"><font cla=
ss=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2"><span cla=
ss=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:normal;">&nbsp; &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;// Yes, fill the stack with zeros</span></font></div>=
<div class=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv1=
007472175class" face=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv1=
007472175class" style=3D"font-style:normal;">- &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;_f_memset((void __far *)(PhysAddr - stk_size), 0=
, stk_size);</span></font></div><div class=3D"ydpc7805dc8yiv1007472175class=
"><font class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D"2=
"><span class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:normal;=
">+ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;// PhysAddr is t=
he last address of the stack (e.g., ...FF), so it's</span></font></div><div=
 class=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv10074=
72175class" face=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv10074=
72175class" style=3D"font-style:normal;">+ &nbsp; &nbsp; &nbsp; &nbsp; &nbs=
p; &nbsp; &nbsp; &nbsp;// necessary to add 1 to get to the starting address=
 of the stack.</span></font></div><div class=3D"ydpc7805dc8yiv1007472175cla=
ss"><font class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D=
"2"><span class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:norma=
l;">+ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;_f_memset((voi=
d __far *)(PhysAddr - stk_size + 1), 0, stk_size);</span></font></div><div =
class=3D"ydpc7805dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv100747=
2175class" face=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv100747=
2175class" style=3D"font-style:normal;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;}</span></font></div><div class=3D"ydpc7805dc8yiv1007472175cla=
ss"><font class=3D"ydpc7805dc8yiv1007472175class" face=3D"Consolas" size=3D=
"2"><span class=3D"ydpc7805dc8yiv1007472175class" style=3D"font-style:norma=
l;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;}</span></font></div><div class=3D"yd=
pc7805dc8yiv1007472175class"><font class=3D"ydpc7805dc8yiv1007472175class" =
face=3D"Consolas" size=3D"2"><span class=3D"ydpc7805dc8yiv1007472175class" =
style=3D"font-style:normal;"><br class=3D"ydpc7805dc8yiv1007472175class" cl=
ear=3D"none"></span></font></div></div><div class=3D"ydpc7805dc8yiv10074721=
75class"><br class=3D"ydpc7805dc8yiv1007472175class" clear=3D"none"></div><=
div class=3D"ydpc7805dc8yiv1007472175class">Please let me know if you have =
any questions about the original bug, or the patches.</div><div class=3D"yd=
pc7805dc8yiv1007472175class"><br class=3D"ydpc7805dc8yiv1007472175class" cl=
ear=3D"none"><div class=3D"ydpc7805dc8yiv1007472175class">
<span class=3D"ydpc7805dc8yiv1007472175Apple-style-span" style=3D"border-co=
llapse:separate;"></span><div class=3D"ydpc7805dc8yiv1007472175class">-Tom<=
/div><br class=3D"ydpc7805dc8yiv1007472175Apple-interchange-newline" clear=
=3D"none">

</div>

<br class=3D"ydpc7805dc8yiv1007472175class" clear=3D"none"></div></div>

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        <hr style=3D"height:2px ; border-width:0; color:#E3E3E3; background=
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        Posted by: Steve Trigero &lt;seecwriter-/[email protected]&gt;        <hr st=
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c2NTkwBGdycElkAzIzMDczMTYEZ3Jwc3BJZAMxNzA2NTU0MjA1BHNlYwNmdHIEc2xrA2dmcARzd=
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------=_Part_2050672_369785736.1560801494082--