LONG mcused; // #bytes used in current mark chunk
uint16_t curfrom; // Current "from" section
+//
+// Imports
+//
+extern int prg_flag; // 1, write ".PRG" relocatable executable
//#define DEBUG_IMAGE_MARKING
if (symbol != NULL)
flags |= MSYMBOL;
+ //
+ // Complain about some things are not allowed in `-p' mode:
+ // o marks that aren't to LONGs;
+ // o external references.
+ //
+ if (prg_flag)
+ {
+ if ((flags & MLONG) == 0)
+ error("illegal word relocatable (in .PRG mode)");
+
+ if (symbol != NULL)
+ errors("illegal external reference (in .PRG mode) to '%s'",
+ symbol->sname);
+ }
+
mcused += sizeof(WORD) + sizeof(LONG);
*markptr.wp++ = flags;
*markptr.lp++ = loc;
}
+/*
+ * Table to convert from TDB to fixup triad
+ *
+ */
+static char mark_tr[] = {
+ 0, /* (n/a) */
+ 2, /* TEXT relocatable */
+ 1, 0, /* DATA relocatable */
+ 3 /* BSS relocatable */
+};
+
+
+/*
+ * Make mark image for Alcyon .o file
+ * okflag -- 1, ok to deposit reloc information
+ */
+LONG markimg(register char * mp, LONG siz, LONG tsize, int okflag)
+{
+ MCHUNK * mch; /* -> mark chunk */
+ register PTR p; /* source point from within mark chunk */
+ WORD from; /* section fixups are currently FROM */
+ register WORD w; /* a word (temp) */
+ LONG loc; /* location (temp) */
+ LONG lastloc; /* last location fixed up (RELMOD) */
+ SYM * symbol; /* -> symbols (temp) */
+ char * wp; /* pointer into raw relocation information */
+ register char * dp; /* deposit point for RELMOD information */
+ int firstp; /* 1, first relocation (RELMOD) */
+ LONG diff; /* difference to relocate (RELMOD) */
+
+ if (okflag)
+ //clear(mp, siz); /* zero relocation buffer */
+ memset(mp, 0, siz); /* zero relocation buffer */
+
+ from = 0;
+
+ for(mch=firstmch; mch!=NULL; mch=mch->mcnext)
+ {
+ for(p=mch->mcptr;;)
+ {
+ w = *p.wp++; /* w = next mark entry */
+
+ if (w & MCHEND) /* (end of mark chunk) */
+ break;
+
+ /*
+ * Get mark record
+ */
+ symbol = NULL;
+ loc = *p.lp++; /* mark location */
+
+ if (w & MCHFROM) /* maybe change "from" section */
+ from = *p.wp++;
+
+ if (w & MSYMBOL) /* maybe includes a symbol */
+ symbol = *p.sy++;
+
+ /*
+ * Compute mark position in relocation information;
+ * in RELMOD mode, get address of data to fix up.
+ */
+ if (from == DATA)
+ loc += tsize;
+
+ wp = (char *)(mp + loc);
+
+ if (okflag && (w & MLONG)) /* indicate first word of long */
+ {
+ wp[1] = 5;
+ wp += 2;
+ }
+
+ if (symbol)
+ {
+ /*
+ * Deposit external reference
+ */
+ if (okflag)
+ {
+ if (w & MPCREL)
+ w = 6; /* pc-relative fixup */
+ else
+ w = 4; /* absolute fixup */
+
+ w |= symbol->senv << 3;
+ *wp++ = w >> 8;
+ *wp = w;
+ }
+ }
+ else
+ {
+ /*
+ * Deposit section-relative mark;
+ * in RELMOD mode, fix it up in the chunk,
+ * kind of like a sleazoid linker.
+ *
+ * In RELMOD mode, marks to words (MWORDs) "cannot happen,"
+ * checks are made when mark() is called, so we don't have
+ * to check again here.
+ */
+ w &= TDB;
+
+ if (okflag)
+ wp[1] = mark_tr[w];
+ else if (prg_flag && (w & (DATA | BSS)))
+ {
+ dp = wp;
+ diff = ((LONG)(*dp++ & 0xff)) << 24;
+ diff |= ((LONG)(*dp++ & 0xff)) << 16;
+ diff |= ((LONG)(*dp++ & 0xff)) << 8;
+ diff |= (LONG)(*dp & 0xff);
+
+#ifdef DO_DEBUG
+ DEBUG printf("diff=%lx ==> ", diff);
+#endif
+ diff += sect[TEXT].sloc;
+
+ if (w == BSS)
+ diff += sect[DATA].sloc;
+
+ dp = wp;
+ *dp++ = (char)(diff >> 24);
+ *dp++ = (char)(diff >> 16);
+ *dp++ = (char)(diff >> 8);
+ *dp = (char)diff;
+#ifdef DO_DEBUG
+ DEBUG printf("%lx\n", diff);
+#endif
+ }
+ }
+ }
+ }
+
+ /*
+ * Generate ".PRG" relocation information in place in
+ * the relocation words (the ``RELMOD'' operation).
+ */
+ if (okflag && prg_flag)
+ {
+ firstp = 1;
+ wp = mp;
+ dp = mp;
+
+ for(loc=0; loc<siz;)
+ {
+ if ((wp[1] & 7) == 5)
+ {
+ if (firstp)
+ {
+ *dp++ = (char)(loc >> 24);
+ *dp++ = (char)(loc >> 16);
+ *dp++ = (char)(loc >> 8);
+ *dp++ = (char)loc;
+ firstp = 0;
+ }
+ else
+ {
+ for(diff=loc-lastloc; diff>254; diff-= 254)
+ *dp++ = 1;
+
+ *dp++ = (char)diff;
+ }
+
+ wp += 4;
+ lastloc = loc;
+ loc += 4;
+ }
+ else
+ {
+ loc += 2;
+ wp += 2;
+ }
+ }
+
+ /*
+ * Terminate relocation list with 0L (if there was no
+ * relocation) or 0.B (if relocation information was
+ * written).
+ */
+ if (!firstp)
+ *dp++ = 0;
+ else for (firstp = 0; firstp < 4; ++firstp)
+ *dp++ = 0;
+
+ /*
+ * Return size of relocation information
+ */
+ loc = dp - mp;
+ return loc;
+ }
+
+ return siz;
+}
+
+
//
// Make mark image for BSD .o file
//
return siz;
}
+
projects / rmac / blobdiff