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6502: Implemented exec command

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Change-Id: I6089c925c35ba6141fafc92c48fcb120019ea03d
This commit is contained in:
David Banks 2019-11-14 18:32:43 +00:00
parent e8c34bbed7
commit 9434397d32
4 changed files with 85 additions and 28 deletions
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76
firmware/AtomBusMon.c
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@ -52,6 +52,7 @@ char *cmdStrings[] = {
"fill",
#if defined(CPU_6502) || defined(CPU_65C02)
"go",
"exec",
#endif
"crc",
"copy",
@ -103,6 +104,7 @@ void (*cmdFuncs[])(char *params) = {
doCmdFill,
#if defined(CPU_6502) || defined(CPU_65C02)
doCmdGo,
doCmdExec,
#endif
doCmdCrc,
doCmdCopy,
@ -157,6 +159,7 @@ static const char ARGS12[] PROGMEM = "<start> <end> [ <test num> ]";
static const char ARGS13[] PROGMEM = "<start> <end> <to>";
static const char ARGS14[] PROGMEM = "[ <value> ]";
static const char ARGS15[] PROGMEM = "[ <command> ]";
static const char ARGS16[] PROGMEM = "<op1> [ <op2> [ <op3> ] ]";
static const char * const argsStrings[] PROGMEM = {
ARGS00,
@ -175,57 +178,59 @@ static const char * const argsStrings[] PROGMEM = {
ARGS13,
ARGS14,
ARGS15,
ARGS16
};
// Must be kept in step with cmdStrings (just above)
static const uint8_t helpMeta[] PROGMEM = {
#if defined(COMMAND_HISTORY)
17, 7, // history
18, 7, // history
#endif
16, 15, // help
17, 15, // help
9, 8, // continue
22, 7, // next
30, 6, // step
25, 7, // regs
23, 7, // next
31, 6, // step
26, 7, // regs
12, 10, // dis
15, 7, // flush
16, 7, // flush
13, 11, // fill
#if defined(CPU_6502) || defined(CPU_65C02)
14, 0, // go
15, 16, // exec
#endif
11, 9, // crc
10, 13, // copy
8, 13, // compare
21, 1, // mem
24, 2, // rd
39, 3, // wr
22, 1, // mem
25, 2, // rd
40, 3, // wr
#if defined(CPU_Z80)
19, 1, // io
18, 2, // in
23, 3, // out
20, 1, // io
19, 2, // in
24, 3, // out
#endif
31, 12, // test
20, 0, // load
27, 9, // save
29, 7, // srec
28, 14, // special
26, 7, // reset
32, 6, // trace
32, 12, // test
21, 0, // load
28, 9, // save
30, 7, // srec
29, 14, // special
27, 7, // reset
33, 6, // trace
1, 7, // blist
6, 4, // breakx
38, 4, // watchx
39, 4, // watchx
4, 4, // breakr
36, 4, // watchr
37, 4, // watchr
5, 4, // breakw
37, 4, // watchw
38, 4, // watchw
#if defined(CPU_Z80)
2, 4, // breaki
33, 4, // watchi
35, 4, // watchi
3, 4, // breako
35, 4, // watcho
36, 4, // watcho
#endif
7, 0, // clear
33, 5, // trigger
34, 5, // trigger
0, 0
};
@ -1475,6 +1480,27 @@ void doCmdGo(char *params) {
logAddr();
}
void doCmdExec(char *params) {
data_t op1 = 0;
data_t op2 = 0;
data_t op3 = 0;
params = parsehex2(params, &op1);
params = parsehex2(params, &op2);
params = parsehex2(params, &op3);
// Read the current PC value
addr_t addr = hwRead16(OFFSET_IAL);
// Execute the specifed opcode
loadData(op1);
loadAddr(op2 + (op3 << 8));
hwCmd(CMD_EXEC_GO, 0);
// JMP back to the original PC value
loadData(0x4C);
loadAddr(addr);
hwCmd(CMD_EXEC_GO, 0);
// Log where we are
logAddr();
}
#endif
void doCmdCrc(char *params) {

1
firmware/AtomBusMon.h
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@ -53,6 +53,7 @@ void doCmdContinue(char *params);
void doCmdCopy(char *params);
void doCmdCrc(char *params);
void doCmdDis(char *params);
void doCmdExec(char *params);
void doCmdFlush(char *params);
void doCmdFill(char *params);
void doCmdGo(char *params);

2
src/BusMonCore.vhd
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@ -450,7 +450,7 @@ begin
-- 10101 Read IO and Auto Inc Address
-- 10110 Write IO
-- 10111 Write IO and Auto Inc Address
-- 11000 Exec Go
-- 11000 Execute 6502 instruction
-- 111xx Unused
-- 11x1x Unused
-- 11xx1 Unused

34
src/MOS6502CpuMonCore.vhd
View File

@ -114,6 +114,7 @@ architecture behavioral of MOS6502CpuMonCore is
signal exec : std_logic;
signal exec_held : std_logic;
signal op3 : std_logic;
begin
@ -238,6 +239,31 @@ begin
Addr_int(15 downto 0) <= std_logic_vector(cpu_addr_us);
end generate;
-- 00 IMP, INDX, IMP, IMP, ZP, ZP, ZP, IMP, IMP, IMM, IMPA, IMP, ABS, ABS, ABS, IMP,
-- 10 BRA, INDY, IND, IMP, ZP, ZPX, ZPX, IMP, IMP, ABSY, IMPA, IMP, ABS, ABSX, ABSX, IMP,
-- 20 ABS, INDX, IMP, IMP, ZP, ZP, ZP, IMP, IMP, IMM, IMPA, IMP, ABS, ABS, ABS, IMP,
-- 30 BRA, INDY, IND, IMP, ZPX, ZPX, ZPX, IMP, IMP, ABSY, IMPA, IMP, ABSX, ABSX, ABSX, IMP,
-- 40 IMP, INDX, IMP, IMP, ZP, ZP, ZP, IMP, IMP, IMM, IMPA, IMP, ABS, ABS, ABS, IMP,
-- 50 BRA, INDY, IND, IMP, ZP, ZPX, ZPX, IMP, IMP, ABSY, IMP, IMP, ABS, ABSX, ABSX, IMP,
-- 60 IMP, INDX, IMP, IMP, ZP, ZP, ZP, IMP, IMP, IMM, IMPA, IMP, IND16, ABS, ABS, IMP,
-- 70 BRA, INDY, IND, IMP, ZPX, ZPX, ZPX, IMP, IMP, ABSY, IMP, IMP, IND1X, ABSX, ABSX, IMP,
-- 80 BRA, INDX, IMP, IMP, ZP, ZP, ZP, IMP, IMP, IMM, IMP, IMP, ABS, ABS, ABS, IMP,
-- 90 BRA, INDY, IND, IMP, ZPX, ZPX, ZPY, IMP, IMP, ABSY, IMP, IMP, ABS, ABSX, ABSX, IMP,
-- A0 IMM, INDX, IMM, IMP, ZP, ZP, ZP, IMP, IMP, IMM, IMP, IMP, ABS, ABS, ABS, IMP,
-- B0 BRA, INDY, IND, IMP, ZPX, ZPX, ZPY, IMP, IMP, ABSY, IMP, IMP, ABSX, ABSX, ABSY, IMP,
-- C0 IMM, INDX, IMP, IMP, ZP, ZP, ZP, IMP, IMP, IMM, IMP, IMP, ABS, ABS, ABS, IMP,
-- D0 BRA, INDY, IND, IMP, ZP, ZPX, ZPX, IMP, IMP, ABSY, IMP, IMP, ABS, ABSX, ABSX, IMP,
-- E0 IMM, INDX, IMP, IMP, ZP, ZP, ZP, IMP, IMP, IMM, IMP, IMP, ABS, ABS, ABS, IMP,
-- F0 BRA, INDY, IND, IMP, ZP, ZPX, ZPX, IMP, IMP, ABSY, IMP, IMP, ABS, ABSX, ABSX, IMP
-- Detect forced opcodes that are 3 bytes long
op3 <= '1' when memory_dout(7 downto 0) = "00100000" else
'1' when memory_dout(4 downto 0) = "11011" else
'1' when memory_dout(3 downto 0) = "1100" else
'1' when memory_dout(3 downto 0) = "1101" else
'1' when memory_dout(3 downto 0) = "1110" else
'0';
Din_int <= memory_dout( 7 downto 0) when state = idle and Sync_int = '1' and exec_held = '1' else
memory_addr( 7 downto 0) when state = exec1 else
memory_addr(15 downto 8) when state = exec2 else
@ -303,7 +329,11 @@ begin
state <= nop0;
-- exec1 is the LSB of a forced JMP
when exec1 =>
state <= exec2;
if op3 = '1' then
state <= exec2;
else
state <= idle;
end if;
-- exec2 is the MSB of a forced JMP
when exec2 =>
state <= idle;
@ -333,7 +363,7 @@ begin
-- Data is captured by the bus monitor on the rising edge of cpu_clk
-- that sees done = 1.
memory_done <= '1' when state = rd or state = wr or state = exec2 else '0';
memory_done <= '1' when state = rd or state = wr or (op3 = '0' and state = exec1) or state = exec2 else '0';
memory_din <= Din;