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Rewrite of the Motorola DSP56k disassembler. (Andrew Gardner)

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* Fixes branch relative offset decoding.
This commit is contained in:
Andrew Gardner 2008-09-19 02:28:20 +00:00
parent e5efb8a895
commit 66954044d1
1 changed files with 7 additions and 8 deletions
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15
src/emu/cpu/dsp56k/dsp56dsm.c
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@ -77,7 +77,7 @@ static size_t dsp56k_dasm_bfop (const UINT16 op, const UINT16 op2, char* opcode
static size_t dsp56k_dasm_bcc (const UINT16 op, const UINT16 op2, char* opcode_str, char* arg_str);
static size_t dsp56k_dasm_bcc_1 (const UINT16 op, char* opcode_str, char* arg_str, const offs_t pc);
static size_t dsp56k_dasm_bcc_2 (const UINT16 op, char* opcode_str, char* arg_str);
static size_t dsp56k_dasm_bra (const UINT16 op, const UINT16 op2, char* opcode_str, char* arg_str);
static size_t dsp56k_dasm_bra (const UINT16 op, const UINT16 op2, char* opcode_str, char* arg_str, const offs_t pc);
static size_t dsp56k_dasm_bra_1 (const UINT16 op, char* opcode_str, char* arg_str, const offs_t pc);
static size_t dsp56k_dasm_bra_2 (const UINT16 op, char* opcode_str, char* arg_str);
static size_t dsp56k_dasm_brkc (const UINT16 op, char* opcode_str, char* arg_str);
@ -717,7 +717,7 @@ offs_t dsp56k_dasm(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opr
/* BRA : 0000 0001 0011 11-- xxxx xxxx xxxx xxxx : A-50 */
else if (((op & 0xfffc) == 0x013c) && ((op2 & 0x0000) == 0x0000))
{
size = dsp56k_dasm_bra(op, op2, opcode_str, arg_str);
size = dsp56k_dasm_bra(op, op2, opcode_str, arg_str, pc);
}
/* BRA : 0000 1011 aaaa aaaa : A-50 */
else if ((op & 0xff00) == 0x0b00)
@ -1742,7 +1742,7 @@ static size_t dsp56k_dasm_bcc_1(const UINT16 op, char* opcode_str, char* arg_str
decode_cccc_table(BITS(op,0x3c0), M);
relativeInt = get_6_bit_signed_value(BITS(op,0x003f));
sprintf(opcode_str, "b.%s", M);
sprintf(arg_str, "%04x (%d)", (int)pc + relativeInt, relativeInt);
sprintf(arg_str, "%04x (%d)", pc + 1 + relativeInt, relativeInt);
return 1;
}
@ -1759,10 +1759,10 @@ static size_t dsp56k_dasm_bcc_2(const UINT16 op, char* opcode_str, char* arg_str
}
/* BRA : 0000 0001 0011 11-- xxxx xxxx xxxx xxxx : A-50 */
static size_t dsp56k_dasm_bra(const UINT16 op, const UINT16 op2, char* opcode_str, char* arg_str)
static size_t dsp56k_dasm_bra(const UINT16 op, const UINT16 op2, char* opcode_str, char* arg_str, const offs_t pc)
{
sprintf(opcode_str, "bra");
sprintf(arg_str, "%d (0x%04x)", op2, op2);
sprintf(arg_str, "%d (0x%04x)", (INT16)op2, pc + 2 + op2);
return 2;
}
@ -1770,7 +1770,7 @@ static size_t dsp56k_dasm_bra(const UINT16 op, const UINT16 op2, char* opcode_st
static size_t dsp56k_dasm_bra_1(const UINT16 op, char* opcode_str, char* arg_str, const offs_t pc)
{
sprintf(opcode_str, "bra");
sprintf(arg_str, "%d (0x%02x)", (INT8)BITS(op,0x00ff), pc + (INT8)BITS(op,0x00ff));
sprintf(arg_str, "%d (0x%02x)", (INT8)BITS(op,0x00ff), pc + 1 + (INT8)BITS(op,0x00ff));
return 1;
}
@ -1820,7 +1820,7 @@ static size_t dsp56k_dasm_bscc_1(const UINT16 op, char* opcode_str, char* arg_st
static size_t dsp56k_dasm_bsr(const UINT16 op, const UINT16 op2, char* opcode_str, char* arg_str, const offs_t pc)
{
sprintf(opcode_str, "bsr");
sprintf(arg_str, "%d (0x%04x)", (INT16)op2, pc + (INT16)op2);
sprintf(arg_str, "%d (0x%04x)", (INT16)op2, pc + 2 + (INT16)op2);
return (2 | DASMFLAG_STEP_OVER);
}
@ -2655,7 +2655,6 @@ static void decode_x_memory_data_move_with_short_displacement(const UINT16 op, c
char SD[32];
char args[32];
/* TODO: Does this do the sign properly? */
B = (char)(op & 0x00ff);
decode_HHH_table(BITS(op2,0x0e00), SD);
assemble_reg_from_W_table(BITS(op2,0x0100), args, 'X', SD, B);