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diff lwasm/os9.c @ 556:928c033c0cd0
Allow MOD directive to accept only the standard base header parameters
There are cases where only the standard OS9 module header fields are to be
provided. This could be, for instance, in the case of a nonstandard user
type module. So allow the execution offset and data size fields to be
omitted entirely and handle the module length correctly as well.
| author | William Astle <lost@l-w.ca> |
|---|---|
| date | Fri, 08 Sep 2023 00:32:40 -0600 |
| parents | 8764142b3192 |
| children | dba08c7dff96 |
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--- a/lwasm/os9.c Sun Jul 23 17:07:58 2023 -0600 +++ b/lwasm/os9.c Fri Sep 08 00:32:40 2023 -0600 @@ -82,7 +82,7 @@ return; } - // parse 6 expressions... + // parse 6 (or 4) expressions... for (i = 0; i < 5; i++) { e = lwasm_parse_expr(as, p); @@ -96,12 +96,19 @@ if (**p != ',') { + if (i == 3) + { + // we don't have the extra items; flag it and don't bother + // with them later; goto is to short circuit the rest of + // the expression parsing + l -> lint = 4; + goto doneexpr; + } lwasm_register_error(as, l, E_OPERAND_BAD); return; } (*p)++; } - e = lwasm_parse_expr(as, p); if (!e) { @@ -109,7 +116,9 @@ return; } lwasm_save_expr(l, 5, e); + l -> lint = 6; +doneexpr: l -> inmod = 1; // we have an implicit ORG 0 with "mod" @@ -123,7 +132,7 @@ // init crc as -> inmod = 1; - l -> len = 13; + l -> len = (i == 6) ? 13 : 9; } EMITFUNC(pseudo_emit_mod) @@ -157,15 +166,18 @@ ^ lw_expr_intval(e3) ^ lw_expr_intval(e4)); lwasm_emit(l, csum); - // module type specific output - // note that these are handled the same for all so - // there need not be any special casing - - // exec offset or fmgr name offset - lwasm_emitexpr(l, lwasm_fetch_expr(l, 4), 2); - - // data size or drvr name offset - lwasm_emitexpr(l, lwasm_fetch_expr(l, 5), 2); + if (l -> lint == 6) + { + // module type specific output, if provided + // note that these are handled the same for all so + // there need not be any special casing + + // exec offset or fmgr name offset + lwasm_emitexpr(l, lwasm_fetch_expr(l, 4), 2); + + // data size or drvr name offset + lwasm_emitexpr(l, lwasm_fetch_expr(l, 5), 2); + } } PARSEFUNC(pseudo_parse_emod)