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sdcc inline asm() not working


sdcc inline asm() not working

By : user2956064
Date : November 22 2020, 10:54 AM
it should still fix some issue Moved from comment
In the sources of SDCC 3.1.0's lexer, I see that both _asm/_endasm and __asm/__endasm are supported. I haven't noticed yet support for __asm("string") in the parser yet.
code :
      result->type = CPP_NAME;
      {
        struct normalize_state nst = INITIAL_NORMALIZE_STATE;
        result->val.node.node = lex_identifier (pfile, buffer->cur - 1, false,
                                                &nst);
        warn_about_normalization (pfile, result, &nst);
      }

      /* SDCC _asm specific */
      /* handle _asm ... _endasm ;  */
      if (result->val.node.node == pfile->spec_nodes.n__asm || result->val.node.node == pfile->spec_nodes.n__asm1)
        {
          if (CPP_OPTION (pfile, preproc_asm) == 0)
            {
              comment_start = buffer->cur;
              result->type = CPP_ASM;
              _sdcpp_skip_asm_block (pfile);
              /* Save the _asm block as a token in its own right.  */
              _sdcpp_save_asm (pfile, result, comment_start, result->val.node.node == pfile->spec_nodes.n__asm);
            }
          result->flags |= ENTER_ASM;
        }
      else if (result->val.node.node == pfile->spec_nodes.n__endasm || result->val.node.node == pfile->spec_nodes.n__endasm1)
        {
          result->flags |= EXIT_ASM;
        }
      /* Convert named operators to their proper types.  */
      else if (result->val.node.node->flags & NODE_OPERATOR)
        {
          result->flags |= NAMED_OP;
          result->type = (enum cpp_ttype) result->val.node.node->directive_index;
        }
      break;


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Compiler warnings with SDCC

Compiler warnings with SDCC


By : user3470519
Date : March 29 2020, 07:55 AM
I wish this helpful for you Disclaimer: I've never worked on a PIC
My guess is that the compiler is detecting that the addresses assigned to those variables (which are sfr's -- "Special Function Registers") are not within the expected memory map for the processor. The sfr syntax looks like __sfr __at (0x80) P0; This is assigining the register variable to a specific address. The warning is saying that those address appear to be invalid.
C51 C compiler inline assembly to SDCC inline assembly

C51 C compiler inline assembly to SDCC inline assembly


By : Doggo mando
Date : March 29 2020, 07:55 AM
this will help I would think you could just replace the $ with a label defined on the same line.
code :
00001$: 
  jnb     T0Full, 00001$
SDCC/C51: Redefine SDCC symbols

SDCC/C51: Redefine SDCC symbols


By : Nagendra Rompicharla
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I've contacted the SDCC-Dev Team
On Sat, 27 Jul 2013, Stefan Falk wrote:
Can't get .define working with sdasz80 (sdcc assembler)

Can't get .define working with sdasz80 (sdcc assembler)


By : Courtney Jones
Date : March 29 2020, 07:55 AM
To fix the issue you can do Well crap, it seems it's a feature they removed for some reason. Searching through the github mirror of SDCC's sources (sdas sources here: https://github.com/svn2github/sdcc/tree/master/sdcc/sdas) SDCC's asxxxx.h (last edited 6 years ago) has this block:
code :
/*
 *      The def structure is used by the .define assembler
 *      directive to define a substitution string for a
 *      single word.  The def structure contains the
 *      string being defined, the string to substitute
 *      for the defined string, and a link to the next
 *      def structure.  The defined string is a sequence
 *      of characters not containing any white space
 *      (i.e. NO SPACEs or TABs).  The substitution string
 *      may contain SPACES and/or TABs.
 */
struct def
{
        struct def      *d_dp;          /* link to next define */
        char            *d_id;          /* defined string */
        char            *d_define;      /* string to substitute for defined string     */
        int             d_dflag;        /* (1) .defined / (0) .undefined */
};
Syntax error on pointer definition that seems valid (from a working library) SDCC

Syntax error on pointer definition that seems valid (from a working library) SDCC


By : Samuel Carter Adelaj
Date : March 29 2020, 07:55 AM
will be helpful for those in need Check the SDCC documentation for standards compliance - it has some quite serious deviations in all modes - in particular in section 3.1.3:
code :
memtype = *(unsigned char*)(&pbuf);

// Start scope block for buf scope...
{
    unsigned char * buf = (unsigned char *)pbuf;

    // buf accessible on this scope only
    ...

}
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