| af32b6c2 |
1 | /************************************* |
| 2 | Little John GP32 |
| 3 | File : ncpu.S |
| 4 | Authors : FCA author |
| 5 | modified and adapted by Yoyo. |
| 6 | adapted for fceu by notaz, 2007. |
| 7 | **************************************/ |
| 8 | |
| 9 | #include "ncpu.h" |
| 10 | |
| 11 | @@@ |
| 12 | @@@ Offets from REG_OP_TABLE |
| 13 | @@@ |
| 14 | #define OTOFFS_NES_RAM (nes_internal_ram - cpu_exec_table) |
| 15 | #define OTOFFS_NES_STACK (nes_stack - cpu_exec_table) |
| 16 | #define OTOFFS_NES_REGS (nes_registers - cpu_exec_table) |
| 17 | #define OTOFFS_PC_BASE (pc_base - cpu_exec_table) |
| 18 | |
| 19 | @ fceu |
| 20 | #define FCEU_IQNMI 0x08 |
| 21 | #define FCEU_IQTEMP 0x80 |
| 22 | |
| 23 | |
| 24 | @@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 25 | |
| 26 | |
| 27 | @ SECTION_FAST |
| 28 | SECTION_TEXT |
| 29 | ALIGN |
| 30 | |
| 31 | |
| 32 | |
| 33 | @@@ |
| 34 | @@@ r0 = Address (unbased) |
| 35 | @@@ uses REG_OP_TABLE; sets REG_PC; trashes r1,r2; keeps r0 |
| 36 | @@@ |
| 37 | .macro REBASE_PC |
| 38 | @ FIXME: do something with mem not in Page[]. |
| 39 | cmp r0, #0x2000 |
| 40 | ldrge r1, =Page |
| 41 | movge r2, r0, lsr #11 |
| 42 | ldrge r2, [r1, r2, lsl #2] |
| 43 | andlt r2, r0, #0xf800 |
| 44 | addlt r1, REG_OP_TABLE, #OTOFFS_NES_RAM |
| 45 | sublt r2, r1, r2 |
| 46 | str r2, [REG_OP_TABLE, #OTOFFS_PC_BASE] |
| 47 | add REG_PC, r2, r0 |
| 48 | .endm |
| 49 | |
| 50 | |
| 51 | .macro RETURN_FROM_CPU_EXEC |
| 52 | b cpu_exec_end |
| 53 | .endm |
| 54 | |
| 55 | |
| 56 | @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 57 | @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 58 | @@@ |
| 59 | @@@ CYCLE_NEXT |
| 60 | @@@ |
| 61 |
notaz.gp2x.de / fceu.git / blame