Remove duplicate code for disassembly

[emu8051.git] / src / common / cpu8051.c

diff --git a/src/common/cpu8051.c b/src/common/cpu8051.c
index 7eb3db9..452ef91 100644 (file)
--- a/src/common/cpu8051.c
+++ b/src/common/cpu8051.c
@@ -497,10 +497,10 @@ cpu8051_get_instruction_size(unsigned char opcode)
 }
 
 /* Display instruction mnemonic. */
-void
+int
 cpu8051_disasm_mnemonic(unsigned char opcode, char *buf)
 {
-       sprintf(buf, "%s", InstTextTbl[InstTypesTbl[opcode]]);
+       return sprintf(buf, "%s", InstTextTbl[InstTypesTbl[opcode]]);
 }
 
 /* Disasm instruction arguments starting at address into a text string */
@@ -510,11 +510,13 @@ cpu8051_disasm_args(unsigned int address, char *buf)
        int len = 0;
        char str[20];
        unsigned char opcode;
-       int ArgTblOfs;
+       int args_table_offset;
        int i;
 
+       buf[0] = '\0';
+
        opcode = memory_read8(PGM_MEM_ID, address);
-       ArgTblOfs = opcode << 2;
+       args_table_offset = opcode << 2;
        address++;
 
        /*
@@ -532,8 +534,8 @@ cpu8051_disasm_args(unsigned int address, char *buf)
                return;
        }
 
-       for (i = 1; i <= InstArgTbl[ArgTblOfs]; i++) {
-               switch (InstArgTbl[ArgTblOfs + i]) {
+       for (i = 1; i <= InstArgTbl[args_table_offset]; i++) {
+               switch (InstArgTbl[args_table_offset + i]) {
                case ADDR11: {
                        len += sprintf(&buf[len],
                                       "%.4XH", ((opcode << 3) & 0xF00) +
@@ -597,11 +599,12 @@ cpu8051_disasm_args(unsigned int address, char *buf)
                        break;
                }
                default: {
-                       len += sprintf(&buf[len], "%s",
-                                      ArgsTextTbl[InstArgTbl[ArgTblOfs + i]]);
+                       len += sprintf(
+                               &buf[len], "%s",
+                               ArgsTextTbl[InstArgTbl[args_table_offset + i]]);
                }
                }
-               if (i < InstArgTbl[ArgTblOfs])
+               if (i < InstArgTbl[args_table_offset])
                        len += sprintf(&buf[len], ",");
        }
 }
@@ -611,9 +614,7 @@ int
 cpu8051_disasm(unsigned int address, char *text)
 {
        int len = 0;
-       char str[20];
        unsigned char opcode;
-       int ArgTblOfs;
        int inst_size;
        int i;
 
@@ -628,110 +629,19 @@ cpu8051_disasm(unsigned int address, char *text)
                len += sprintf(&text[len], " %.2X",
                               memory_read8(PGM_MEM_ID, address + i));
 
-       address++;
-
        /* Padd remaining area with spaces. */
        for (; len < 17;)
                len += sprintf(&text[len], " ");
 
        /* Display instruction mnemonic. */
-       len += sprintf(&text[len], "%s ",
-                      InstTextTbl[InstTypesTbl[opcode]]);
-       ArgTblOfs = opcode << 2;
+       len += cpu8051_disasm_mnemonic(opcode, &text[len]);
 
        /* Padd remaining area with spaces. */
        for (; len < 25;)
                len += sprintf(&text[len], " ");
 
        /* Display instruction arguments. */
-
-       /*
-        * MOV direct, direct (opcode 85h) is peculiar, the operands
-        * are inverted
-        */
-       if (opcode == 0x85) {
-               cpu8051_sfr_mem_info(memory_read8(PGM_MEM_ID, address + 1),
-                                    str);
-               len += sprintf(&text[len], "%s,", str);
-               cpu8051_sfr_mem_info(memory_read8(PGM_MEM_ID, address),
-                                    str);
-               len += sprintf(&text[len], "%s", str);
-               address += 2;
-               return inst_size;
-       }
-
-       for (i = 1; i <= InstArgTbl[ArgTblOfs]; i++) {
-               switch (InstArgTbl[ArgTblOfs + i]) {
-               case ADDR11: {
-                       len += sprintf(&text[len],
-                                      "%.4XH", ((opcode << 3) & 0xF00) +
-                                      (memory_read8(PGM_MEM_ID, address)));
-                       address++;
-                       break;
-               }
-               case ADDR16: {
-                       len += sprintf(
-                               &text[len], "%.4XH",
-                               ((memory_read8(PGM_MEM_ID, address) << 8) +
-                                memory_read8(PGM_MEM_ID, address + 1)));
-                       address += 2;
-                       break;
-               }
-               case DIRECT: {
-                       cpu8051_sfr_mem_info(memory_read8(PGM_MEM_ID, address),
-                                            str);
-                       len += sprintf(&text[len], "%s", str);
-                       address++;
-                       break;
-               }
-               case BITADDR: {
-                       cpu8051_int_mem_bit_info(
-                               (memory_read8(PGM_MEM_ID, address) & 0xF8),
-                               str);
-                       len += sprintf(&text[len], "%s.%X" , str,
-                                      (memory_read8(PGM_MEM_ID, address) & 7));
-                       address++;
-                       break;
-               }
-               case RELADDR: {
-                       address++;
-                       len += sprintf(&text[len], "%.4XH", (address & 0xFF00) +
-                                      (((address & 0xFF) +
-                                        memory_read8(PGM_MEM_ID,
-                                                     address - 1)) & 0xFF));
-                       break;
-               }
-               case DATAIMM: {
-                       len += sprintf(&text[len], "#%.2XH",
-                                      memory_read8(PGM_MEM_ID, address));
-                       address++;
-                       break;
-               }
-               case DATA16: {
-                       len += sprintf(&text[len], "#%.4XH",
-                                      ((memory_read8(PGM_MEM_ID,
-                                                     address) << 8) +
-                                       memory_read8(PGM_MEM_ID, address+1)));
-                       address += 2;
-                       break;
-               }
-               case CBITADDR: {
-                       cpu8051_int_mem_bit_info((memory_read8(PGM_MEM_ID,
-                                                              address) & 0xF8),
-                                                str);
-                       len += sprintf(&text[len], "/%s.%X", str,
-                                      (memory_read8(PGM_MEM_ID, address) & 7));
-                       address++;
-                       break;
-               }
-               default: {
-                       len += sprintf(&text[len], "%s",
-                                      ArgsTextTbl[InstArgTbl[ArgTblOfs + i]]);
-               }
-               }
-               if (i < InstArgTbl[ArgTblOfs])
-                       len += sprintf(&text[len], ",");
-       }
+       cpu8051_disasm_args(address, &text[len]);
 
        return inst_size;
 }