[sdcc-devel] [ sdcc-Feature Requests-2815320 ] please add asm() pseudo function as alternate

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Feature Requests item #2815320, was opened at 2009-07-01 13:13
Message generated for change (Tracker Item Submitted) made by dfulab
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Category: None
Group: None
Status: Open
Priority: 5
Private: No
Submitted By: dfulab (dfulab)
Assigned to: Nobody/Anonymous (nobody)
Summary: please add asm() pseudo function as alternate

Initial Comment:
Is it possible to add the asm() as an alternate to _asm _endasm?
The reason why I am asking is that _asm and _endasm seems to be doing a lot of unnecessary processing that so far causes bugs in my embedded assembly code.  I would like to see one that treats the embedded as a string and simply paste it into the assembly file without any processing.  Since it doesn't make sense to alter the behavior of existing feature, this would be an alternative.

Bugs I have caught so far for Z80 version:
- assembly comments contains ! causes internal error (resolved)
- ex af,af'    - that extra ' is part of a valid operand, but causes an error because the compiler thinks it is an unclosed ' ' quote.  I had to use a .db with the right values to trick the compiler into putting the right code.
- multi-line #define macro issues all lumped into the same line.  If you are not careful, this can cause serious issues.  A simple ; comment can turn every assembly code after it into comments.

The following is taken from ez80 port from freertos project.  This makes the assembly listing easier to read instead of a clump of text all squeezed into a single line.  Also funny stuff like the ex af,af' won't cause grief and eliminates any potential compiler induced bug cause by its own processing.

#define portSAVE_CONTEXT()                          \
    asm (   "xref   _pxCurrentTCB           \n\t"   \
            "di                             \n\t"   \
            "push   af                      \n\t"   \
            "in0    a,      (62h)           \n\t"   \
            "push   bc                      \n\t"   \
            "push   de                      \n\t"   \
            "push   hl                      \n\t"   \
            "push   iy                      \n\t"   \
            "ex     af,     af'             \n\t"   \
            "exx                            \n\t"   \
            "push   af                      \n\t"   \
            "push   bc                      \n\t"   \
            "push   de                      \n\t"   \
            "push   hl                      \n\t"   \
            "ld     ix,     0               \n\t"   \
            "add    ix,     sp              \n\t"   \
            "ld     hl,     (_pxCurrentTCB) \n\t"   \
            "ld     (hl),   ix              \n\t"   \
        );


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