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annotate backend_x86.c @ 590:ea80559c67cb

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WIP effort to update z80 core for code gen changes
author Michael Pavone <pavone@retrodev.com>
date Sun, 14 Dec 2014 16:45:23 -0800
parents 2dde38c1744f
children 5ef3fe516da9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
567
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
1 #include "backend.h"
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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2 #include "gen_x86.h"
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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3
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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4 void cycles(cpu_options *opts, uint32_t num)
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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5 {
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
Michael Pavone <pavone@retrodev.com>
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6 add_ir(&opts->code, num, opts->cycles, SZ_D);
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
Michael Pavone <pavone@retrodev.com>
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7 }
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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8
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
Michael Pavone <pavone@retrodev.com>
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diff changeset
9 void check_cycles_int(cpu_options *opts, uint32_t address)
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
Michael Pavone <pavone@retrodev.com>
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10 {
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
Michael Pavone <pavone@retrodev.com>
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11 code_info *code = &opts->code;
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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12 cmp_rr(code, opts->cycles, opts->limit, SZ_D);
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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13 code_ptr jmp_off = code->cur+1;
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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14 jcc(code, CC_NC, jmp_off+1);
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
Michael Pavone <pavone@retrodev.com>
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15 mov_ir(code, address, opts->scratch1, SZ_D);
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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16 call(code, opts->handle_cycle_limit_int);
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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17 *jmp_off = code->cur - (jmp_off+1);
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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18 }
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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19
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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20 void check_cycles(cpu_options * opts)
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
Michael Pavone <pavone@retrodev.com>
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21 {
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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22 code_info *code = &opts->code;
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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23 cmp_rr(code, opts->cycles, opts->limit, SZ_D);
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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24 check_alloc_code(code, MAX_INST_LEN*2);
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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25 code_ptr jmp_off = code->cur+1;
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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26 jcc(code, CC_NC, jmp_off+1);
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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27 call(code, opts->handle_cycle_limit);
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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28 *jmp_off = code->cur - (jmp_off+1);
8e395210f50f Refactor gen_x86 to use an interface more like gen_arm and to remove the need for the caller to decide whether an 8-bit or 32-bit displacement is needed in the rdisp functions. Update m68k_to_x86 to use the new version of the gen_x86 functions and do some minor refactoring there in the process
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29 }
589
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30
590
ea80559c67cb WIP effort to update z80 core for code gen changes
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31 code_ptr gen_mem_fun(cpu_options * opts, memmap_chunk * memmap, uint32_t num_chunks, ftype fun_type, code_ptr *after_inc)
589
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32 {
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33 code_info *code = &opts->code;
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34 code_ptr start = code->cur;
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35 check_cycles(opts);
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36 cycles(opts, opts->bus_cycles);
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37 if (after_inc) {
ea80559c67cb WIP effort to update z80 core for code gen changes
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38 *after_inc = code->cur;
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39 }
589
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40 if (opts->address_size == SZ_D && opts->address_mask < 0xFFFFFFFF) {
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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41 and_ir(code, opts->address_mask, opts->scratch1, SZ_D);
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42 }
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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43 code_ptr lb_jcc = NULL, ub_jcc = NULL;
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44 uint8_t is_write = fun_type == WRITE_16 || fun_type == WRITE_8;
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45 uint8_t adr_reg = is_write ? opts->scratch2 : opts->scratch1;
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46 uint16_t access_flag = is_write ? MMAP_WRITE : MMAP_READ;
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47 uint8_t size = (fun_type == READ_16 || fun_type == WRITE_16) ? SZ_W : SZ_B;
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48 for (uint32_t chunk = 0; chunk < num_chunks; chunk++)
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49 {
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50 if (memmap[chunk].start > 0) {
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51 cmp_ir(code, memmap[chunk].start, adr_reg, opts->address_size);
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52 lb_jcc = code->cur + 1;
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53 jcc(code, CC_C, code->cur + 2);
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54 }
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55 if (memmap[chunk].end < opts->max_address) {
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56 cmp_ir(code, memmap[chunk].end, adr_reg, opts->address_size);
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57 ub_jcc = code->cur + 1;
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58 jcc(code, CC_NC, code->cur + 2);
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59 }
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60
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61 if (memmap[chunk].mask != opts->address_mask) {
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62 and_ir(code, memmap[chunk].mask, adr_reg, opts->address_size);
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63 }
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64 void * cfun;
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65 switch (fun_type)
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66 {
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67 case READ_16:
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68 cfun = memmap[chunk].read_16;
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69 break;
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70 case READ_8:
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71 cfun = memmap[chunk].read_8;
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72 break;
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73 case WRITE_16:
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74 cfun = memmap[chunk].write_16;
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75 break;
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76 case WRITE_8:
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77 cfun = memmap[chunk].write_8;
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78 break;
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79 default:
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80 cfun = NULL;
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81 }
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82 if(memmap[chunk].buffer && memmap[chunk].flags & access_flag) {
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83 if (memmap[chunk].flags & MMAP_PTR_IDX) {
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84 if (memmap[chunk].flags & MMAP_FUNC_NULL) {
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diff changeset
85 cmp_irdisp(code, 0, opts->context_reg, opts->mem_ptr_off + sizeof(void*) * memmap[chunk].ptr_index, SZ_PTR);
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86 code_ptr not_null = code->cur + 1;
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diff changeset
87 jcc(code, CC_NZ, code->cur + 2);
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diff changeset
88 call(code, opts->save_context);
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diff changeset
89 #ifdef X86_64
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diff changeset
90 if (is_write) {
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diff changeset
91 if (opts->scratch2 != RDI) {
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diff changeset
92 mov_rr(code, opts->scratch2, RDI, opts->address_size);
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93 }
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diff changeset
94 mov_rr(code, opts->scratch1, RDX, size);
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diff changeset
95 } else {
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diff changeset
96 push_r(code, opts->context_reg);
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diff changeset
97 mov_rr(code, opts->scratch1, RDI, opts->address_size);
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diff changeset
98 }
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diff changeset
99 test_ir(code, 8, RSP, opts->address_size);
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diff changeset
100 code_ptr adjust_rsp = code->cur + 1;
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diff changeset
101 jcc(code, CC_NZ, code->cur + 2);
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diff changeset
102 call(code, cfun);
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103 code_ptr no_adjust = code->cur + 1;
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104 jmp(code, code->cur + 2);
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105 *adjust_rsp = code->cur - (adjust_rsp + 1);
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diff changeset
106 sub_ir(code, 8, RSP, SZ_PTR);
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diff changeset
107 call(code, cfun);
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diff changeset
108 add_ir(code, 8, RSP, SZ_PTR);
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109 *no_adjust = code->cur - (no_adjust + 1);
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diff changeset
110 #else
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111 if (is_write) {
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diff changeset
112 push_r(code, opts->scratch1);
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113 } else {
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114 push_r(code, opts->context_reg);//save opts->context_reg for later
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115 }
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diff changeset
116 push_r(code, opts->context_reg);
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117 push_r(code, is_write ? opts->scratch2 : opts->scratch1);
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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diff changeset
118 call(code, cfun);
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119 add_ir(code, is_write ? 12 : 8, RSP, opts->address_size);
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diff changeset
120 #endif
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121 if (is_write) {
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122 mov_rr(code, RAX, opts->context_reg, SZ_PTR);
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diff changeset
123 } else {
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diff changeset
124 pop_r(code, opts->context_reg);
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125 mov_rr(code, RAX, opts->scratch1, size);
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126 }
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127 jmp(code, opts->load_context);
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128
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129 *not_null = code->cur - (not_null + 1);
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130 }
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diff changeset
131 if (opts->byte_swap && size == SZ_B) {
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132 xor_ir(code, 1, adr_reg, opts->address_size);
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133 }
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134 if (opts->address_size != SZ_D) {
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135 movzx_rr(code, adr_reg, adr_reg, opts->address_size, SZ_D);
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136 }
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diff changeset
137 add_rdispr(code, opts->context_reg, opts->mem_ptr_off + sizeof(void*) * memmap[chunk].ptr_index, adr_reg, SZ_PTR);
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diff changeset
138 if (is_write) {
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139 mov_rrind(code, opts->scratch1, opts->scratch2, size);
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140
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141 } else {
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diff changeset
142 mov_rindr(code, opts->scratch1, opts->scratch1, size);
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143 }
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144 } else {
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diff changeset
145 uint8_t tmp_size = size;
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diff changeset
146 if (size == SZ_B) {
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147 if ((memmap[chunk].flags & MMAP_ONLY_ODD) || (memmap[chunk].flags & MMAP_ONLY_EVEN)) {
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diff changeset
148 bt_ir(code, 0, adr_reg, opts->address_size);
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149 code_ptr good_addr = code->cur + 1;
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diff changeset
150 jcc(code, (memmap[chunk].flags & MMAP_ONLY_ODD) ? CC_C : CC_NC, code->cur + 2);
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diff changeset
151 if (!is_write) {
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diff changeset
152 mov_ir(code, 0xFF, opts->scratch1, SZ_B);
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153 }
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diff changeset
154 retn(code);
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diff changeset
155 *good_addr = code->cur - (good_addr + 1);
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diff changeset
156 shr_ir(code, 1, adr_reg, opts->address_size);
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diff changeset
157 } else {
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diff changeset
158 xor_ir(code, 1, adr_reg, opts->address_size);
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159 }
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diff changeset
160 } else if ((memmap[chunk].flags & MMAP_ONLY_ODD) || (memmap[chunk].flags & MMAP_ONLY_EVEN)) {
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diff changeset
161 tmp_size = SZ_B;
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diff changeset
162 shr_ir(code, 1, adr_reg, opts->address_size);
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diff changeset
163 if ((memmap[chunk].flags & MMAP_ONLY_EVEN) && is_write) {
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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diff changeset
164 shr_ir(code, 8, opts->scratch1, SZ_W);
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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165 }
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diff changeset
166 }
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diff changeset
167 if ((intptr_t)memmap[chunk].buffer <= 0x7FFFFFFF && (intptr_t)memmap[chunk].buffer >= -2147483648) {
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diff changeset
168 if (is_write) {
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diff changeset
169 mov_rrdisp(code, opts->scratch1, opts->scratch2, (intptr_t)memmap[chunk].buffer, tmp_size);
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diff changeset
170 } else {
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diff changeset
171 mov_rdispr(code, opts->scratch1, (intptr_t)memmap[chunk].buffer, opts->scratch1, tmp_size);
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172 }
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diff changeset
173 } else {
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diff changeset
174 if (is_write) {
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diff changeset
175 push_r(code, opts->scratch1);
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diff changeset
176 mov_ir(code, (intptr_t)memmap[chunk].buffer, opts->scratch1, SZ_PTR);
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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diff changeset
177 add_rr(code, opts->scratch1, opts->scratch2, SZ_PTR);
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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diff changeset
178 pop_r(code, opts->scratch1);
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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diff changeset
179 mov_rrind(code, opts->scratch1, opts->scratch2, tmp_size);
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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diff changeset
180 } else {
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diff changeset
181 mov_ir(code, (intptr_t)memmap[chunk].buffer, opts->scratch2, SZ_PTR);
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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diff changeset
182 mov_rindexr(code, opts->scratch2, opts->scratch1, 1, opts->scratch1, tmp_size);
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183 }
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184 }
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diff changeset
185 if (size != tmp_size && !is_write) {
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diff changeset
186 if (memmap[chunk].flags & MMAP_ONLY_EVEN) {
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diff changeset
187 shl_ir(code, 8, opts->scratch1, SZ_W);
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diff changeset
188 mov_ir(code, 0xFF, opts->scratch1, SZ_B);
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189 } else {
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diff changeset
190 or_ir(code, 0xFF00, opts->scratch1, SZ_W);
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191 }
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192 }
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193 }
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diff changeset
194 if (is_write && (memmap[chunk].flags & MMAP_CODE)) {
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195 //TODO: Fixme for Z80
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196 mov_rr(code, opts->scratch2, opts->scratch1, opts->address_size);
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197 shr_ir(code, 11, opts->scratch1, opts->address_size);
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198 bt_rrdisp(code, opts->scratch1, opts->context_reg, opts->ram_flags_off, opts->address_size);
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199 code_ptr not_code = code->cur + 1;
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200 jcc(code, CC_NC, code->cur + 2);
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201 call(code, opts->save_context);
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diff changeset
202 #ifdef X86_32
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203 push_r(code, opts->context_reg);
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204 push_r(code, opts->scratch2);
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205 #endif
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206 call(code, opts->handle_code_write);
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207 #ifdef X86_32
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208 add_ir(code, 8, RSP, SZ_D);
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diff changeset
209 #endif
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210 mov_rr(code, RAX, opts->context_reg, SZ_PTR);
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diff changeset
211 call(code, opts->load_context);
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212 *not_code = code->cur - (not_code+1);
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213 }
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diff changeset
214 retn(code);
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215 } else if (cfun) {
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diff changeset
216 call(code, opts->save_context);
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217 #ifdef X86_64
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218 if (is_write) {
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219 if (opts->scratch2 != RDI) {
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220 mov_rr(code, opts->scratch2, RDI, opts->address_size);
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221 }
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diff changeset
222 mov_rr(code, opts->scratch1, RDX, size);
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223 } else {
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diff changeset
224 push_r(code, opts->context_reg);
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225 mov_rr(code, opts->scratch1, RDI, opts->address_size);
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226 }
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227 test_ir(code, 8, RSP, SZ_D);
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228 code_ptr adjust_rsp = code->cur + 1;
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229 jcc(code, CC_NZ, code->cur + 2);
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230 call(code, cfun);
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diff changeset
231 code_ptr no_adjust = code->cur + 1;
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232 jmp(code, code->cur + 2);
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233 *adjust_rsp = code->cur - (adjust_rsp + 1);
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diff changeset
234 sub_ir(code, 8, RSP, SZ_PTR);
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diff changeset
235 call(code, cfun);
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diff changeset
236 add_ir(code, 8, RSP, SZ_PTR);
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diff changeset
237 *no_adjust = code->cur - (no_adjust+1);
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diff changeset
238 #else
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diff changeset
239 if (is_write) {
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240 push_r(code, opts->scratch1);
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241 } else {
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242 push_r(code, opts->context_reg);//save opts->context_reg for later
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243 }
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diff changeset
244 push_r(code, opts->context_reg);
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245 push_r(code, is_write ? opts->scratch2 : opts->scratch1);
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diff changeset
246 call(code, cfun);
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diff changeset
247 add_ir(code, is_write ? 12 : 8, RSP, SZ_D);
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diff changeset
248 #endif
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diff changeset
249 if (is_write) {
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diff changeset
250 mov_rr(code, RAX, opts->context_reg, SZ_PTR);
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diff changeset
251 } else {
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diff changeset
252 pop_r(code, opts->context_reg);
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diff changeset
253 mov_rr(code, RAX, opts->scratch1, size);
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diff changeset
254 }
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diff changeset
255 jmp(code, opts->load_context);
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diff changeset
256 } else {
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diff changeset
257 //Not sure the best course of action here
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diff changeset
258 if (!is_write) {
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diff changeset
259 mov_ir(code, size == SZ_B ? 0xFF : 0xFFFF, opts->scratch1, size);
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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diff changeset
260 }
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diff changeset
261 retn(code);
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diff changeset
262 }
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diff changeset
263 if (lb_jcc) {
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diff changeset
264 *lb_jcc = code->cur - (lb_jcc+1);
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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diff changeset
265 lb_jcc = NULL;
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diff changeset
266 }
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diff changeset
267 if (ub_jcc) {
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diff changeset
268 *ub_jcc = code->cur - (ub_jcc+1);
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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diff changeset
269 ub_jcc = NULL;
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diff changeset
270 }
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diff changeset
271 }
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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diff changeset
272 if (!is_write) {
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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diff changeset
273 mov_ir(code, size == SZ_B ? 0xFF : 0xFFFF, opts->scratch1, size);
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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diff changeset
274 }
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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diff changeset
275 retn(code);
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diff changeset
276 return start;
2dde38c1744f Split gen_mem_fun out of m68k_core_x86 and make it more generic so it can be used by the Z80 core
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diff changeset
277 }