On Sunday 08 December 2002 01:12 pm, Aaron Ardiri wrote:
> but, based on what chris was 'hinting' was that using multigen doesn't
> do so :) that makes it very interesting. especially for armlet builders.
> it has been a long time since i did use multigen, maybe chris can fill
> us in on the capabilities? :)
>
> [opens the floor to chris - explain boy] :P
>From my reading of multilink.c, it uses FtrGet() (called in
MultilinkGetCodeSegments) for old a4 based gcc, and it does something much
simpler for a5 based gcc.
static int
write_dispatch_code_a4(FILE* fp, unsigned long cid)
{
fprintf(fp,
/* When we don't have globals, get jmptables from ftr land */
"dispatch_noglobals:\n"
" move.l %%d0,-(%%sp)\n"
" move.l %%d1,-(%%sp)\n"
" move.l #0x%lx,-(%%sp)\n" /* push creator id */
" bsr.w MultilinkGetCodeSegments\n"
" lea 4(%%sp),%%sp\n"
" move.l (%%sp)+,%%d1\n"
" move.l (%%sp)+,%%d0\n"
" bra.b dispatch_really\n"
/*
* If the code from here to the jmp at the end changes,
* then the value branch_count is set to must change to
* match.
*/
"dispatch:\n"
/* do we have globals */
" move.l %%a4,%%d2\n" /* tst.l %a4 fatal resets */
" beq.b dispatch_noglobals\n"
/* yes, get the jmp table pointer */
" move.l MultilinkSegmentJmpTables(%%a4),%%a0\n"
"dispatch_really:\n"
/* get the segment table */
" move.l (%%a0,%%d1.w),%%a0\n"
/* get the offset from the table */
" move.w (%%a0,%%d0.w),%%d2\n"
" jmp (%%a0,%%d2.w)\n"
"", cid);
return 20; /*FIXME*/
}
static int
write_dispatch_code_a5(FILE* fp)
{
fprintf(fp,
/*
* If the code from here to the jmp at the end changes,
* then the value branch_count is set to must change to
* match.
*/
"dispatch:\n"
/* get the jmp table pointer */
" move.l MultilinkSegmentJmpTables@END(%%a5),%%a0\n"
/* get the segment table */
" move.l (%%a0,%%d1.w),%%a0\n"
/* get the offset from the table */
" move.w (%%a0,%%d0.w),%%d2\n"
/* jump to real function */
" jmp (%%a0,%%d2.w)\n"
"");
return 16; /*FIXME*/
}
--
/* Chris Faherty <[EMAIL PROTECTED]> */
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