syntax for asm in sdcc

[john111w]

I need to use the sdcc compiler in an IDE. I have about 16K of ASM51 code
that I need to compile with sdcc so that I can use the source in the debug
pane. The IDE only shows dissambly (with label numbers) unless you use C.

So I fugured I'd create a C "shell" and import my asm51 file

Where can I go to learn how to embed the asm?

The IDE has a C example which compiles with sdcc. I tried 2 hours of web
searches last night to find the syntax to add 2 trial lines.

__asm
mov a,b
mov b,a
__ endasm

I tried single underscore, double underscore, quotes, slashes, parens, as
shown in many web search examples
I even tried without the mov's just
__asm/
__endasm as shown in an SDCC forum example.

I can't see how to create a thread in the SourceForge.net to ask this
question
Help is greatly appreciated.


---------------------------------------
Posted through http://www.EmbeddedRelated.com

[john111w]

[Rocky]

Mmmm, I'm not sure about the '/' after asm. This is what I used a
while ago to do some footling with interupts.


__asm
push psw
push acc
push dpl
push dph
push b
mov a,#(.+9)
push acc
mov a,#((.+5) >> 8)
push acc
reti

nop

__endasm;

[Rich Webb]

I still have a project that's still using sdcc, although it's an older
rev (2.6) and I haven't been following possible syntax shifts in later
releases. That said, it looks like you need
_asm
<stuff>
_endasm;
as in this example from the 2.6 manual:

void to_buffer( unsigned char c )
{
c; // to avoid warning: unreferenced function argument
_asm
; save used registers here.
; If we were still using r2,r3 we would have to push them here.
; if( head != (unsigned char)(tail-1) )
mov a,_tail
dec a
xrl a,_head
; we could do an ANL a,#0x0f here to use a smaller buffer (see below)
jz t_b_end$
;
; buf[ head++ ] = c;
mov a,dpl ; dpl holds lower byte of function argument
mov dpl,_head ; buf is 0x100 byte aligned so head can be used directly
mov dph,#(_buf> >8)
movx @dptr,a
inc _head
; we could do an ANL _head,#0x0f here to use a smaller buffer (see
above)
t_b_end$:
; restore used registers here
_endasm;
}

--
Rich Webb Norfolk, VA

[john111w]

>On Jun 8, 5:50=A0pm, "john111w" <greenwick@n_o_s_p_a_m.nni.com> wrote:
>> I need to use the sdcc compiler in an IDE. I have about 16K of ASM51
code
>> that I need to compile with sdcc so that I can use the source in the

debu=

>g
>> pane. The IDE only shows dissambly (with label numbers) unless you use
C.
>>
>> So I fugured I'd create a C "shell" and import my asm51 file
>>
>> Where can I go to learn how to embed the asm?
>>
>> The IDE has a C example which compiles with sdcc. I tried 2 hours of
web
>> searches last night to find the syntax to add 2 trial lines.
>>
>> __asm
>> mov a,b
>> mov b,a
>> __ endasm
>>
>> I tried single underscore, double underscore, quotes, slashes, parens,
as
>> shown in many web search examples
>> I even tried without the mov's just
>> __asm/

>> __endasm =A0 as shown in an SDCC forum example.

>>
>> I can't see how to create a thread in the SourceForge.net to ask this
>> question
>> Help is greatly appreciated.
>>
>> ---------------------------------------
>> Posted throughhttp://www.EmbeddedRelated.com
>
>Mmmm, I'm not sure about the '/' after asm. This is what I used a
>while ago to do some footling with interupts.
>
>
> __asm
> push psw
> push acc
> push dpl
> push dph
> push b
> mov a,#(.+9)
> push acc
> mov a,#((.+5) >> 8)
> push acc
> reti
>
> nop
>
> __endasm;
>

[john111w]

>On Jun 8, 5:50=A0pm, "john111w" <greenwick@n_o_s_p_a_m.nni.com> wrote:
>> I need to use the sdcc compiler in an IDE. I have about 16K of ASM51
code
>> that I need to compile with sdcc so that I can use the source in the

debu=

>g
>> pane. The IDE only shows dissambly (with label numbers) unless you use
C.
>>
>> So I fugured I'd create a C "shell" and import my asm51 file
>>
>> Where can I go to learn how to embed the asm?
>>
>> The IDE has a C example which compiles with sdcc. I tried 2 hours of
web
>> searches last night to find the syntax to add 2 trial lines.
>>
>> __asm
>> mov a,b
>> mov b,a
>> __ endasm
>>
>> I tried single underscore, double underscore, quotes, slashes, parens,
as
>> shown in many web search examples
>> I even tried without the mov's just
>> __asm/

>> __endasm =A0 as shown in an SDCC forum example.

>>
>> I can't see how to create a thread in the SourceForge.net to ask this
>> question
>> Help is greatly appreciated.
>>
>> ---------------------------------------
>> Posted throughhttp://www.EmbeddedRelated.com
>
>Mmmm, I'm not sure about the '/' after asm. This is what I used a
>while ago to do some footling with interupts.
>
>
> __asm
> push psw
> push acc
> push dpl
> push dph
> push b
> mov a,#(.+9)
> push acc
> mov a,#((.+5) >> 8)
> push acc
> reti
>
> nop
>
> __endasm;
>

I just tried:
__asm
__endasm; received syntax error token-> '__endasm' column 8 (the letter
m)

[Tim Wescott]

Perhaps you need to indent? You shouldn't -- but the compiler is
obviously being picky on you.

(I really like the Gnu "asm" syntax by the way -- in my opinion it's the
best thought-out, and complete, way to implement assembly that I've seen).

As a work-around, can you implement those critical functions entirely in
assembly? You'll have call overhead, but you'll have less totally non-
portable structures scattered around your code.

--
My liberal friends think I'm a conservative kook.
My conservative friends think I'm a liberal kook.
Why am I not happy that they have found common ground?

Tim Wescott, Communications, Control, Circuits & Software
http://www.wescottdesign.com

[Rocky]

> Posted throughhttp://www.EmbeddedRelated.com- Hide quoted text -
>
> - Show quoted text -

I tried downloading the latest version and the code compiled - didn't
check if it worked :( too much hassle right now.
Version:
C:\SDCC\bin>sdcc -v
SDCC : mcs51/gbz80/z80/z180/r2k/r3ka/ds390/pic16/pic14/TININative/
ds400/hc08/s08
3.1.5 #7874 (Jun 7 2012) (MINGW32)

C:\SDCC\bin>

[Philipp Klaus Krause]

On 08.06.2012 23:02, Rocky wrote:

> I tried downloading the latest version and the code compiled - didn't
> check if it worked :( too much hassle right now.
> Version:
> C:\SDCC\bin>sdcc -v
> SDCC : mcs51/gbz80/z80/z180/r2k/r3ka/ds390/pic16/pic14/TININative/
> ds400/hc08/s08
> 3.1.5 #7874 (Jun 7 2012) (MINGW32)

Historically sdcc used _asm and _endasm. Some time ago this was changed
to also allow __asm and __endasm. Recently the old _asm and _endasm has
been removed, and sdcc now only supports the standard-compliant __asm
and __endasm. So depending on how old the sdcc version used is, it will
support _asm, __asm or both.

Philipp