git.joshuawise.com / fpgaboy.git / blame
| Commit | Line | Data |
|---|---|---|
| e7fe9dc2 JW |
1 | `define INSN_PUSH_reg 9'b011xx0101 |
| 2 | ||
| 81358c71 JW |
3 | `ifdef EXECUTE |
| 4 | `INSN_PUSH_reg: begin /* PUSH is 16 cycles! */ | |
| 5 | case (cycle) | |
| 5c33c5c0 JW |
6 | 0: case (opcode[5:4]) |
| 7 | `INSN_stack_AF: `EXEC_WRITE(`_SP - 1, `_A) | |
| 8 | `INSN_stack_BC: `EXEC_WRITE(`_SP - 1, `_B) | |
| 9 | `INSN_stack_DE: `EXEC_WRITE(`_SP - 1, `_D) | |
| 10 | `INSN_stack_HL: `EXEC_WRITE(`_SP - 1, `_H) | |
| 11 | endcase | |
| 12 | 1: case (opcode[5:4]) | |
| 6c46357c JW |
13 | `INSN_stack_AF: `EXEC_WRITE(`_SP - 2, `_F) |
| 14 | `INSN_stack_BC: `EXEC_WRITE(`_SP - 2, `_C) | |
| 15 | `INSN_stack_DE: `EXEC_WRITE(`_SP - 2, `_E) | |
| 16 | `INSN_stack_HL: `EXEC_WRITE(`_SP - 2, `_L) | |
| 5c33c5c0 | 17 | endcase |
| 81358c71 JW |
18 | 2: begin /* Twiddle thumbs. */ end |
| 19 | 3: begin | |
| 5c33c5c0 JW |
20 | `EXEC_NEWCYCLE |
| 21 | `EXEC_INC_PC | |
| 81358c71 JW |
22 | end |
| 23 | endcase | |
| 24 | end | |
| 25 | `endif | |
| 26 | ||
| 27 | `ifdef WRITEBACK | |
| 28 | `INSN_PUSH_reg: begin /* PUSH is 16 cycles! */ | |
| 29 | case (cycle) | |
| 30 | 0: begin /* type F */ end | |
| 31 | 1: begin /* type F */ end | |
| 32 | 2: begin /* type F */ end | |
| 5c33c5c0 | 33 | 3: `_SP <= `_SP - 2; |
| 81358c71 JW |
34 | endcase |
| 35 | end | |
| 36 | `endif |