Re: Bug in crt0.cpp ?

[Julian F. Reschke <julian@GOEDEL.UNI-MUENSTER.DE>]

> 
> Hi,
> I just came across an interesting point: in crt0, there is a test for
> the program being started as accessory:
>         subl    a6, a6          | clear a6 for debuggers
>         cmpw    #0, a0          | test if acc or program
>         beq     __startprg      | if a program, go elsewhere
>         tstl    a0@(36)         | also test parent basepage pointer
>         bne     __startprg      | for accs, it must be 0
>         movel   a0, Base        | acc basepage is in A0
>         lea     a0@(252), sp    | use the command line as a temporary stack
>         jmp     __acc_main      | function is in crtinit.c
> But atari has documented that accessories are started with a0 containing
> the basepage pointer, they said nothing about the pointer to the parent's
> basepage.
> Why is there a test for the parent pointer to be zero?
> It might break some accessories written with gcc, or am I too pessimistic?
> 
> Ulrich

Especially when started from MultiTOS, I think.

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Julian F. Reschke, Hensenstr. 142, D-W4400 Muenster
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