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view lwasm/os9.c @ 402:b20f14edda5a
Completed initial conversion to new parser allowing spaces in operands
Converted the remaining addressing modes. This required a complete rewrite
of a large portion of the indexed addressing parser. Now the entire indexed
parsing system is programmatic without cheating with a lookup table.
This update also fixes the "force 0,r" by writing a literal 0,r which is
*supposed* to work.
There will likely be some pseudo ops that need tweaking for space handling,
specially those that take multiple operands of some description which are
not expressions. (The expression parser call eats the spaces both before and
after the expression, if appropriate.)
author | William Astle <lost@l-w.ca> |
---|---|
date | Wed, 14 Oct 2015 20:49:41 -0600 |
parents | 8764142b3192 |
children | 928c033c0cd0 |
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/* os9.c Copyright © 2009 William Astle This file is part of LWASM. LWASM is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. This file implements the various pseudo operations related to OS9 target */ #include <errno.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <lw_expr.h> #include "lwasm.h" #include "instab.h" // OS9 syscall PARSEFUNC(pseudo_parse_os9) { lw_expr_t e; if (as -> output_format != OUTPUT_OS9 && as -> output_format != OUTPUT_OBJ) { lwasm_register_error2(as, l, E_DIRECTIVE_OS9_ONLY, "%s", "os9"); return; } // fetch immediate value e = lwasm_parse_expr(as, p); if (!e) { lwasm_register_error(as, l, E_OPERAND_BAD); return; } lwasm_save_expr(l, 0, e); l -> len = 3; } EMITFUNC(pseudo_emit_os9) { lw_expr_t e; e = lwasm_fetch_expr(l, 0); lwasm_emitop(l, 0x103f); lwasm_emitexpr(l, e, 1); } PARSEFUNC(pseudo_parse_mod) { lw_expr_t e; int i; if (as -> output_format != OUTPUT_OS9) { lwasm_register_error2(as, l, E_DIRECTIVE_OS9_ONLY, "%s", "mod"); skip_operand(p); return; } if (as -> inmod) { lwasm_register_error(as, l, E_MODULE_IN); skip_operand(p); return; } // parse 6 expressions... for (i = 0; i < 5; i++) { e = lwasm_parse_expr(as, p); if (!e) { lwasm_register_error(as, l, E_OPERAND_BAD); return; } lwasm_save_expr(l, i, e); if (**p != ',') { lwasm_register_error(as, l, E_OPERAND_BAD); return; } (*p)++; } e = lwasm_parse_expr(as, p); if (!e) { lwasm_register_error(as, l, E_OPERAND_BAD); return; } lwasm_save_expr(l, 5, e); l -> inmod = 1; // we have an implicit ORG 0 with "mod" lw_expr_destroy(l -> addr); l -> addr = lw_expr_build(lw_expr_type_int, 0); // likewise for data pointer lw_expr_destroy(l -> daddr); l -> daddr = lw_expr_build(lw_expr_type_int, 0); // init crc as -> inmod = 1; l -> len = 13; } EMITFUNC(pseudo_emit_mod) { lw_expr_t e1, e2, e3, e4; int csum; as -> crc[0] = 0xff; as -> crc[1] = 0xff; as -> crc[2] = 0xff; // sync bytes lwasm_emit(l, 0x87); lwasm_emit(l, 0xcd); // mod length lwasm_emitexpr(l, e1 = lwasm_fetch_expr(l, 0), 2); // name offset lwasm_emitexpr(l, e2 = lwasm_fetch_expr(l, 1), 2); // type lwasm_emitexpr(l, e3 = lwasm_fetch_expr(l, 2), 1); // flags/rev lwasm_emitexpr(l, e4 = lwasm_fetch_expr(l, 3), 1); // header check csum = ~(0x87 ^ 0xCD ^(lw_expr_intval(e1) >> 8) ^ (lw_expr_intval(e1) & 0xff) ^ (lw_expr_intval(e2) >> 8) ^ (lw_expr_intval(e2) & 0xff) ^ 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); } PARSEFUNC(pseudo_parse_emod) { skip_operand(p); if (as -> output_format != OUTPUT_OS9) { lwasm_register_error2(as, l, E_DIRECTIVE_OS9_ONLY, "%s", "emod"); return; } if (!(as -> inmod)) { lwasm_register_error(as, l, E_MODULE_NOTIN); return; } as -> inmod = 0; l -> len = 3; } EMITFUNC(pseudo_emit_emod) { unsigned char tcrc[3]; // don't mess with CRC! tcrc[0] = as -> crc[0] ^ 0xff; tcrc[1] = as -> crc[1] ^ 0xff; tcrc[2] = as -> crc[2] ^ 0xff; lwasm_emit(l, tcrc[0]); lwasm_emit(l, tcrc[1]); lwasm_emit(l, tcrc[2]); }