Commit | Line | Data |
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28b48aa1 SB |
1 | /* Debug stub for Z80. |
2 | ||
88b9d363 | 3 | Copyright (C) 2021-2022 Free Software Foundation, Inc. |
28b48aa1 SB |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | /* Usage: | |
21 | 1. Copy this file to project directory | |
22 | 2. Configure it commenting/uncommenting macros below or define DBG_CONFIGURED | |
23 | and all required macros and then include this file to one of your C-source | |
24 | files. | |
25 | 3. Implement getDebugChar() and putDebugChar(), functions must not return | |
26 | until data received or sent. | |
27 | 4. Implement all optional functions used to toggle breakpoints/watchpoints, | |
28 | if supported. Do not write fuctions to toggle software breakpoints if | |
29 | you unsure (GDB will do itself). | |
30 | 5. Implement serial port initialization routine called at program start. | |
31 | 6. Add necessary debugger entry points to your program, for example: | |
32 | .org 0x08 ;RST 8 handler | |
33 | jp _debug_swbreak | |
34 | ... | |
35 | .org 0x66 ;NMI handler | |
36 | jp _debug_nmi | |
37 | ... | |
38 | main_loop: | |
39 | halt | |
40 | call isDbgInterrupt | |
41 | jr z,101$ | |
42 | ld hl, 2 ;EX_SIGINT | |
43 | push hl | |
44 | call _debug_exception | |
45 | 101$: | |
46 | ... | |
47 | 7. Compile file using SDCC (supported ports are: z80, z180, z80n, gbz80 and | |
48 | ez80_z80), do not use --peep-asm option. For example: | |
49 | $ sdcc -mz80 --opt-code-size --max-allocs-per-node 50000 z80-stub.c | |
50 | */ | |
51 | /******************************************************************************\ | |
52 | Configuration | |
53 | \******************************************************************************/ | |
54 | #ifndef DBG_CONFIGURED | |
55 | /* Uncomment this line, if stub size is critical for you */ | |
56 | //#define DBG_MIN_SIZE | |
57 | ||
58 | /* Comment this line out if software breakpoints are unsupported. | |
59 | If you have special function to toggle software breakpoints, then provide | |
60 | here name of these function. Expected prototype: | |
61 | int toggle_swbreak(int set, void *addr); | |
62 | function must return 0 on success. */ | |
63 | //#define DBG_SWBREAK toggle_swbreak | |
64 | #define DBG_SWBREAK | |
65 | ||
66 | /* Define if one of standard RST handlers is used as software | |
67 | breakpoint entry point */ | |
68 | //#define DBG_SWBREAK_RST 0x08 | |
69 | ||
70 | /* if platform supports hardware breakpoints then define following macro | |
71 | by name of function. Fuction must have next prototype: | |
72 | int toggle_hwbreak(int set, void *addr); | |
73 | function must return 0 on success. */ | |
74 | //#define DBG_HWBREAK toggle_hwbreak | |
75 | ||
76 | /* if platform supports hardware watchpoints then define all or some of | |
77 | following macros by names of functions. Fuctions prototypes: | |
78 | int toggle_watch(int set, void *addr, size_t size); // memory write watch | |
79 | int toggle_rwatch(int set, void *addr, size_t size); // memory read watch | |
80 | int toggle_awatch(int set, void *addr, size_t size); // memory access watch | |
81 | function must return 0 on success. */ | |
82 | //#define DBG_WWATCH toggle_watch | |
83 | //#define DBG_RWATCH toggle_rwatch | |
84 | //#define DBG_AWATCH toggle_awatch | |
85 | ||
86 | /* Size of hardware breakpoint. Required to correct PC. */ | |
87 | #define DBG_HWBREAK_SIZE 0 | |
88 | ||
89 | /* Define following macro if you need custom memory read/write routine. | |
90 | Function should return non-zero on success, and zero on failure | |
91 | (for example, write to ROM area). | |
92 | Useful with overlays (bank switching). | |
93 | Do not forget to define: | |
94 | _ovly_table - overlay table | |
95 | _novlys - number of items in _ovly_table | |
96 | or | |
97 | _ovly_region_table - overlay regions table | |
98 | _novly_regions - number of items in _ovly_region_table | |
99 | ||
100 | _ovly_debug_prepare - function is called before overlay mapping | |
101 | _ovly_debug_event - function is called after overlay mapping | |
102 | */ | |
103 | //#define DBG_MEMCPY memcpy | |
104 | ||
105 | /* define dedicated stack size if required */ | |
106 | //#define DBG_STACK_SIZE 256 | |
107 | ||
108 | /* max GDB packet size | |
109 | should be much less that DBG_STACK_SIZE because it will be allocated on stack | |
110 | */ | |
111 | #define DBG_PACKET_SIZE 150 | |
112 | ||
113 | /* Uncomment if required to use trampoline when resuming operation. | |
114 | Useful with dedicated stack when stack pointer do not point to the stack or | |
115 | stack is not writable */ | |
116 | //#define DBG_USE_TRAMPOLINE | |
117 | ||
118 | /* Uncomment following macro to enable debug printing to debugger console */ | |
119 | //#define DBG_PRINT | |
120 | ||
121 | #define DBG_NMI_EX EX_HWBREAK | |
122 | #define DBG_INT_EX EX_SIGINT | |
123 | ||
124 | /* Define following macro to statement, which will be exectuted after entering to | |
125 | stub_main function. Statement should include semicolon. */ | |
126 | //#define DBG_ENTER debug_enter(); | |
127 | ||
128 | /* Define following macro to instruction(s), which will be execute before return | |
129 | control to the program. It is useful when gdb-stub is placed in one of overlays. | |
130 | This procedure must not change any register. On top of stack before invocation | |
131 | will be return address of the program. */ | |
132 | //#define DBG_RESUME jp _restore_bank | |
133 | ||
134 | /* Define following macro to the string containing memory map definition XML. | |
135 | GDB will use it to select proper breakpoint type (HW or SW). */ | |
136 | /*#define DBG_MEMORY_MAP "\ | |
137 | <memory-map>\ | |
138 | <memory type=\"rom\" start=\"0x0000\" length=\"0x4000\"/>\ | |
139 | <!-- <memory type=\"flash\" start=\"0x4000\" length=\"0x4000\">\ | |
140 | <property name=\"blocksize\">128</property>\ | |
141 | </memory> -->\ | |
142 | <memory type=\"ram\" start=\"0x8000\" length=\"0x8000\"/>\ | |
143 | </memory-map>\ | |
144 | " | |
145 | */ | |
146 | #endif /* DBG_CONFIGURED */ | |
147 | /******************************************************************************\ | |
148 | Public Interface | |
149 | \******************************************************************************/ | |
150 | ||
151 | /* Enter to debug mode from software or hardware breakpoint. | |
152 | Assume address of next instruction after breakpoint call is on top of stack. | |
153 | Do JP _debug_swbreak or JP _debug_hwbreak from RST handler, for example. | |
154 | */ | |
155 | void debug_swbreak (void); | |
156 | void debug_hwbreak (void); | |
157 | ||
158 | /* Jump to this function from NMI handler. Just replace RETN instruction by | |
159 | JP _debug_nmi | |
160 | Use if NMI detects request to enter to debug mode. | |
161 | */ | |
162 | void debug_nmi (void); | |
163 | ||
164 | /* Jump to this function from INT handler. Just replace EI+RETI instructions by | |
165 | JP _debug_int | |
166 | Use if INT detects request to enter to debug mode. | |
167 | */ | |
168 | void debug_int (void); | |
169 | ||
170 | #define EX_SWBREAK 0 /* sw breakpoint */ | |
171 | #define EX_HWBREAK -1 /* hw breakpoint */ | |
172 | #define EX_WWATCH -2 /* memory write watch */ | |
173 | #define EX_RWATCH -3 /* memory read watch */ | |
174 | #define EX_AWATCH -4 /* memory access watch */ | |
175 | #define EX_SIGINT 2 | |
176 | #define EX_SIGTRAP 5 | |
177 | #define EX_SIGABRT 6 | |
178 | #define EX_SIGBUS 10 | |
179 | #define EX_SIGSEGV 11 | |
180 | /* or any standard *nix signal value */ | |
181 | ||
182 | /* Enter to debug mode (after receiving BREAK from GDB, for example) | |
183 | * Assume: | |
184 | * program PC in (SP+0) | |
185 | * caught signal in (SP+2) | |
186 | * program SP is SP+4 | |
187 | */ | |
188 | void debug_exception (int ex); | |
189 | ||
190 | /* Prints to debugger console. */ | |
191 | void debug_print(const char *str); | |
192 | /******************************************************************************\ | |
193 | Required functions | |
194 | \******************************************************************************/ | |
195 | ||
196 | extern int getDebugChar (void); | |
197 | extern void putDebugChar (int ch); | |
198 | ||
199 | #ifdef DBG_SWBREAK | |
200 | #define DO_EXPAND(VAL) VAL ## 123456 | |
201 | #define EXPAND(VAL) DO_EXPAND(VAL) | |
202 | ||
203 | #if EXPAND(DBG_SWBREAK) != 123456 | |
204 | #define DBG_SWBREAK_PROC DBG_SWBREAK | |
205 | extern int DBG_SWBREAK(int set, void *addr); | |
206 | #endif | |
207 | ||
208 | #undef EXPAND | |
209 | #undef DO_EXPAND | |
210 | #endif /* DBG_SWBREAK */ | |
211 | ||
212 | #ifdef DBG_HWBREAK | |
213 | extern int DBG_HWBREAK(int set, void *addr); | |
214 | #endif | |
215 | ||
216 | #ifdef DBG_MEMCPY | |
217 | extern void* DBG_MEMCPY (void *dest, const void *src, unsigned n); | |
218 | #endif | |
219 | ||
220 | #ifdef DBG_WWATCH | |
221 | extern int DBG_WWATCH(int set, void *addr, unsigned size); | |
222 | #endif | |
223 | ||
224 | #ifdef DBG_RWATCH | |
225 | extern int DBG_RWATCH(int set, void *addr, unsigned size); | |
226 | #endif | |
227 | ||
228 | #ifdef DBG_AWATCH | |
229 | extern int DBG_AWATCH(int set, void *addr, unsigned size); | |
230 | #endif | |
231 | ||
232 | /******************************************************************************\ | |
233 | IMPLEMENTATION | |
234 | \******************************************************************************/ | |
235 | ||
236 | #include <string.h> | |
237 | ||
238 | #ifndef NULL | |
239 | # define NULL (void*)0 | |
240 | #endif | |
241 | ||
242 | typedef unsigned char byte; | |
243 | typedef unsigned short word; | |
244 | ||
245 | /* CPU state */ | |
246 | #ifdef __SDCC_ez80_adl | |
247 | # define REG_SIZE 3 | |
248 | #else | |
249 | # define REG_SIZE 2 | |
250 | #endif /* __SDCC_ez80_adl */ | |
251 | ||
252 | #define R_AF (0*REG_SIZE) | |
253 | #define R_BC (1*REG_SIZE) | |
254 | #define R_DE (2*REG_SIZE) | |
255 | #define R_HL (3*REG_SIZE) | |
256 | #define R_SP (4*REG_SIZE) | |
257 | #define R_PC (5*REG_SIZE) | |
258 | ||
259 | #ifndef __SDCC_gbz80 | |
260 | #define R_IX (6*REG_SIZE) | |
261 | #define R_IY (7*REG_SIZE) | |
262 | #define R_AF_ (8*REG_SIZE) | |
263 | #define R_BC_ (9*REG_SIZE) | |
264 | #define R_DE_ (10*REG_SIZE) | |
265 | #define R_HL_ (11*REG_SIZE) | |
266 | #define R_IR (12*REG_SIZE) | |
267 | ||
268 | #ifdef __SDCC_ez80_adl | |
269 | #define R_SPS (13*REG_SIZE) | |
270 | #define NUMREGBYTES (14*REG_SIZE) | |
271 | #else | |
272 | #define NUMREGBYTES (13*REG_SIZE) | |
273 | #endif /* __SDCC_ez80_adl */ | |
274 | #else | |
275 | #define NUMREGBYTES (6*REG_SIZE) | |
276 | #define FASTCALL | |
277 | #endif /*__SDCC_gbz80 */ | |
278 | static byte state[NUMREGBYTES]; | |
279 | ||
280 | #if DBG_PACKET_SIZE < (NUMREGBYTES*2+5) | |
281 | #error "Too small DBG_PACKET_SIZE" | |
282 | #endif | |
283 | ||
284 | #ifndef FASTCALL | |
285 | #define FASTCALL __z88dk_fastcall | |
286 | #endif | |
287 | ||
288 | /* dedicated stack */ | |
289 | #ifdef DBG_STACK_SIZE | |
290 | ||
291 | #define LOAD_SP ld sp, #_stack + DBG_STACK_SIZE | |
292 | ||
293 | static char stack[DBG_STACK_SIZE]; | |
294 | ||
295 | #else | |
296 | ||
297 | #undef DBG_USE_TRAMPOLINE | |
298 | #define LOAD_SP | |
299 | ||
300 | #endif | |
301 | ||
302 | #ifndef DBG_ENTER | |
303 | #define DBG_ENTER | |
304 | #endif | |
305 | ||
306 | #ifndef DBG_RESUME | |
307 | #define DBG_RESUME ret | |
308 | #endif | |
309 | ||
310 | static signed char sigval; | |
311 | ||
312 | static void stub_main (int sigval, int pc_adj); | |
313 | static char high_hex (byte v) FASTCALL; | |
314 | static char low_hex (byte v) FASTCALL; | |
315 | static char put_packet_info (const char *buffer) FASTCALL; | |
316 | static void save_cpu_state (void); | |
317 | static void rest_cpu_state (void); | |
318 | ||
319 | /******************************************************************************/ | |
320 | #ifdef DBG_SWBREAK | |
321 | #ifdef DBG_SWBREAK_RST | |
322 | #define DBG_SWBREAK_SIZE 1 | |
323 | #else | |
324 | #define DBG_SWBREAK_SIZE 3 | |
325 | #endif | |
326 | void | |
327 | debug_swbreak (void) __naked | |
328 | { | |
329 | __asm | |
330 | ld (#_state + R_SP), sp | |
331 | LOAD_SP | |
332 | call _save_cpu_state | |
333 | ld hl, #-DBG_SWBREAK_SIZE | |
334 | push hl | |
335 | ld hl, #EX_SWBREAK | |
336 | push hl | |
337 | call _stub_main | |
338 | .globl _break_handler | |
339 | #ifdef DBG_SWBREAK_RST | |
340 | _break_handler = DBG_SWBREAK_RST | |
341 | #else | |
342 | _break_handler = _debug_swbreak | |
343 | #endif | |
344 | __endasm; | |
345 | } | |
346 | #endif /* DBG_SWBREAK */ | |
347 | /******************************************************************************/ | |
348 | #ifdef DBG_HWBREAK | |
349 | #ifndef DBG_HWBREAK_SIZE | |
350 | #define DBG_HWBREAK_SIZE 0 | |
351 | #endif /* DBG_HWBREAK_SIZE */ | |
352 | void | |
353 | debug_hwbreak (void) __naked | |
354 | { | |
355 | __asm | |
356 | ld (#_state + R_SP), sp | |
357 | LOAD_SP | |
358 | call _save_cpu_state | |
359 | ld hl, #-DBG_HWBREAK_SIZE | |
360 | push hl | |
361 | ld hl, #EX_HWBREAK | |
362 | push hl | |
363 | call _stub_main | |
364 | __endasm; | |
365 | } | |
366 | #endif /* DBG_HWBREAK_SET */ | |
367 | /******************************************************************************/ | |
368 | void | |
369 | debug_exception (int ex) __naked | |
370 | { | |
371 | __asm | |
372 | ld (#_state + R_SP), sp | |
373 | LOAD_SP | |
374 | call _save_cpu_state | |
375 | ld hl, #0 | |
376 | push hl | |
377 | #ifdef __SDCC_gbz80 | |
378 | ld hl, #_state + R_SP | |
379 | ld a, (hl+) | |
380 | ld h, (hl) | |
381 | ld l, a | |
382 | #else | |
383 | ld hl, (#_state + R_SP) | |
384 | #endif | |
385 | inc hl | |
386 | inc hl | |
387 | ld e, (hl) | |
388 | inc hl | |
389 | ld d, (hl) | |
390 | push de | |
391 | call _stub_main | |
392 | __endasm; | |
393 | (void)ex; | |
394 | } | |
395 | /******************************************************************************/ | |
396 | #ifndef __SDCC_gbz80 | |
397 | void | |
398 | debug_nmi(void) __naked | |
399 | { | |
400 | __asm | |
401 | ld (#_state + R_SP), sp | |
402 | LOAD_SP | |
403 | call _save_cpu_state | |
404 | ld hl, #0 ;pc_adj | |
405 | push hl | |
406 | ld hl, #DBG_NMI_EX | |
407 | push hl | |
408 | ld hl, #_stub_main | |
409 | push hl | |
410 | push hl | |
411 | retn | |
412 | __endasm; | |
413 | } | |
414 | #endif | |
415 | /******************************************************************************/ | |
416 | void | |
417 | debug_int(void) __naked | |
418 | { | |
419 | __asm | |
420 | ld (#_state + R_SP), sp | |
421 | LOAD_SP | |
422 | call _save_cpu_state | |
423 | ld hl, #0 ;pc_adj | |
424 | push hl | |
425 | ld hl, #DBG_INT_EX | |
426 | push hl | |
427 | ld hl, #_stub_main | |
428 | push hl | |
429 | push hl | |
430 | ei | |
431 | reti | |
432 | __endasm; | |
433 | } | |
434 | /******************************************************************************/ | |
435 | #ifdef DBG_PRINT | |
436 | void | |
437 | debug_print(const char *str) | |
438 | { | |
439 | putDebugChar ('$'); | |
440 | putDebugChar ('O'); | |
441 | char csum = 'O'; | |
442 | for (; *str != '\0'; ) | |
443 | { | |
444 | char c = high_hex (*str); | |
445 | csum += c; | |
446 | putDebugChar (c); | |
447 | c = low_hex (*str++); | |
448 | csum += c; | |
449 | putDebugChar (c); | |
450 | } | |
451 | putDebugChar ('#'); | |
452 | putDebugChar (high_hex (csum)); | |
453 | putDebugChar (low_hex (csum)); | |
454 | } | |
455 | #endif /* DBG_PRINT */ | |
456 | /******************************************************************************/ | |
457 | static void store_pc_sp (int pc_adj) FASTCALL; | |
458 | #define get_reg_value(mem) (*(void* const*)(mem)) | |
459 | #define set_reg_value(mem,val) do { (*(void**)(mem) = (val)); } while (0) | |
460 | static char* byte2hex(char *buf, byte val); | |
461 | static int hex2int (const char **buf) FASTCALL; | |
462 | static char* int2hex (char *buf, int v); | |
463 | static void get_packet (char *buffer); | |
464 | static void put_packet (const char *buffer); | |
465 | static char process (char *buffer) FASTCALL; | |
466 | static void rest_cpu_state (void); | |
467 | ||
468 | static void | |
469 | stub_main (int ex, int pc_adj) | |
470 | { | |
471 | char buffer[DBG_PACKET_SIZE+1]; | |
472 | sigval = (signed char)ex; | |
473 | store_pc_sp (pc_adj); | |
474 | ||
475 | DBG_ENTER | |
476 | ||
477 | /* after starting gdb_stub must always return stop reason */ | |
478 | *buffer = '?'; | |
479 | for (; process (buffer);) | |
480 | { | |
481 | put_packet (buffer); | |
482 | get_packet (buffer); | |
483 | } | |
484 | put_packet (buffer); | |
485 | rest_cpu_state (); | |
486 | } | |
487 | ||
488 | static void | |
489 | get_packet (char *buffer) | |
490 | { | |
491 | byte csum; | |
492 | char ch; | |
493 | char *p; | |
494 | byte esc; | |
495 | #if DBG_PACKET_SIZE <= 256 | |
496 | byte count; /* it is OK to use up to 256 here */ | |
497 | #else | |
498 | unsigned count; | |
499 | #endif | |
500 | for (;; putDebugChar ('-')) | |
501 | { | |
502 | /* wait for packet start character */ | |
503 | while (getDebugChar () != '$'); | |
504 | retry: | |
505 | csum = 0; | |
506 | esc = 0; | |
507 | p = buffer; | |
508 | count = DBG_PACKET_SIZE; | |
509 | do | |
510 | { | |
511 | ch = getDebugChar (); | |
512 | switch (ch) | |
513 | { | |
514 | case '$': | |
515 | goto retry; | |
516 | case '#': | |
517 | goto finish; | |
518 | case '}': | |
519 | esc = 0x20; | |
520 | break; | |
521 | default: | |
522 | *p++ = ch ^ esc; | |
523 | esc = 0; | |
524 | --count; | |
525 | } | |
526 | csum += ch; | |
527 | } | |
528 | while (count != 0); | |
529 | finish: | |
530 | *p = '\0'; | |
531 | if (ch != '#') /* packet is too large */ | |
532 | continue; | |
533 | ch = getDebugChar (); | |
534 | if (ch != high_hex (csum)) | |
535 | continue; | |
536 | ch = getDebugChar (); | |
537 | if (ch != low_hex (csum)) | |
538 | continue; | |
539 | break; | |
540 | } | |
541 | putDebugChar ('+'); | |
542 | } | |
543 | ||
544 | static void | |
545 | put_packet (const char *buffer) | |
546 | { | |
547 | /* $<packet info>#<checksum>. */ | |
548 | for (;;) | |
549 | { | |
550 | putDebugChar ('$'); | |
551 | char checksum = put_packet_info (buffer); | |
552 | putDebugChar ('#'); | |
553 | putDebugChar (high_hex(checksum)); | |
554 | putDebugChar (low_hex(checksum)); | |
555 | for (;;) | |
556 | { | |
557 | char c = getDebugChar (); | |
558 | switch (c) | |
559 | { | |
560 | case '+': return; | |
561 | case '-': break; | |
562 | default: | |
563 | putDebugChar (c); | |
564 | continue; | |
565 | } | |
566 | break; | |
567 | } | |
568 | } | |
569 | } | |
570 | ||
571 | static char | |
572 | put_packet_info (const char *src) FASTCALL | |
573 | { | |
574 | char ch; | |
575 | char checksum = 0; | |
576 | for (;;) | |
577 | { | |
578 | ch = *src++; | |
579 | if (ch == '\0') | |
580 | break; | |
581 | if (ch == '}' || ch == '*' || ch == '#' || ch == '$') | |
582 | { | |
583 | /* escape special characters */ | |
584 | putDebugChar ('}'); | |
585 | checksum += '}'; | |
586 | ch ^= 0x20; | |
587 | } | |
588 | putDebugChar (ch); | |
589 | checksum += ch; | |
590 | } | |
591 | return checksum; | |
592 | } | |
593 | ||
594 | static void | |
595 | store_pc_sp (int pc_adj) FASTCALL | |
596 | { | |
597 | byte *sp = get_reg_value (&state[R_SP]); | |
598 | byte *pc = get_reg_value (sp); | |
599 | pc += pc_adj; | |
600 | set_reg_value (&state[R_PC], pc); | |
601 | set_reg_value (&state[R_SP], sp + REG_SIZE); | |
602 | } | |
603 | ||
604 | static char *mem2hex (char *buf, const byte *mem, unsigned bytes); | |
605 | static char *hex2mem (byte *mem, const char *buf, unsigned bytes); | |
606 | ||
607 | /* Command processors. Takes pointer to buffer (begins from command symbol), | |
608 | modifies buffer, returns: -1 - empty response (ignore), 0 - success, | |
609 | positive: error code. */ | |
610 | ||
611 | #ifdef DBG_MIN_SIZE | |
612 | static signed char | |
613 | process_question (char *p) FASTCALL | |
614 | { | |
615 | signed char sig; | |
616 | *p++ = 'S'; | |
617 | sig = sigval; | |
618 | if (sig <= 0) | |
619 | sig = EX_SIGTRAP; | |
620 | p = byte2hex (p, (byte)sig); | |
621 | *p = '\0'; | |
622 | return 0; | |
623 | } | |
624 | #else /* DBG_MIN_SIZE */ | |
625 | static char *format_reg_value (char *p, unsigned reg_num, const byte *value); | |
626 | ||
627 | static signed char | |
628 | process_question (char *p) FASTCALL | |
629 | { | |
630 | signed char sig; | |
631 | *p++ = 'T'; | |
632 | sig = sigval; | |
633 | if (sig <= 0) | |
634 | sig = EX_SIGTRAP; | |
635 | p = byte2hex (p, (byte)sig); | |
636 | p = format_reg_value(p, R_AF/REG_SIZE, &state[R_AF]); | |
637 | p = format_reg_value(p, R_SP/REG_SIZE, &state[R_SP]); | |
638 | p = format_reg_value(p, R_PC/REG_SIZE, &state[R_PC]); | |
639 | #if defined(DBG_SWBREAK_PROC) || defined(DBG_HWBREAK) || defined(DBG_WWATCH) || defined(DBG_RWATCH) || defined(DBG_AWATCH) | |
640 | const char *reason; | |
641 | unsigned addr = 0; | |
642 | switch (sigval) | |
643 | { | |
644 | #ifdef DBG_SWBREAK_PROC | |
645 | case EX_SWBREAK: | |
646 | reason = "swbreak"; | |
647 | break; | |
648 | #endif | |
649 | #ifdef DBG_HWBREAK | |
650 | case EX_HWBREAK: | |
651 | reason = "hwbreak"; | |
652 | break; | |
653 | #endif | |
654 | #ifdef DBG_WWATCH | |
655 | case EX_WWATCH: | |
656 | reason = "watch"; | |
657 | addr = 1; | |
658 | break; | |
659 | #endif | |
660 | #ifdef DBG_RWATCH | |
661 | case EX_RWATCH: | |
662 | reason = "rwatch"; | |
663 | addr = 1; | |
664 | break; | |
665 | #endif | |
666 | #ifdef DBG_AWATCH | |
667 | case EX_AWATCH: | |
668 | reason = "awatch"; | |
669 | addr = 1; | |
670 | break; | |
671 | #endif | |
672 | default: | |
673 | goto finish; | |
674 | } | |
675 | while ((*p++ = *reason++)) | |
676 | ; | |
677 | --p; | |
678 | *p++ = ':'; | |
679 | if (addr != 0) | |
680 | p = int2hex(p, addr); | |
681 | *p++ = ';'; | |
682 | finish: | |
683 | #endif /* DBG_HWBREAK, DBG_WWATCH, DBG_RWATCH, DBG_AWATCH */ | |
684 | *p++ = '\0'; | |
685 | return 0; | |
686 | } | |
687 | #endif /* DBG_MINSIZE */ | |
688 | ||
689 | #define STRING2(x) #x | |
690 | #define STRING1(x) STRING2(x) | |
691 | #define STRING(x) STRING1(x) | |
692 | #ifdef DBG_MEMORY_MAP | |
693 | static void read_memory_map (char *buffer, unsigned offset, unsigned length); | |
694 | #endif | |
695 | ||
696 | static signed char | |
697 | process_q (char *buffer) FASTCALL | |
698 | { | |
699 | char *p; | |
700 | if (memcmp (buffer + 1, "Supported", 9) == 0) | |
701 | { | |
702 | memcpy (buffer, "PacketSize=", 11); | |
703 | p = int2hex (&buffer[11], DBG_PACKET_SIZE); | |
704 | #ifndef DBG_MIN_SIZE | |
705 | #ifdef DBG_SWBREAK_PROC | |
706 | memcpy (p, ";swbreak+", 9); | |
707 | p += 9; | |
708 | #endif | |
709 | #ifdef DBG_HWBREAK | |
710 | memcpy (p, ";hwbreak+", 9); | |
711 | p += 9; | |
712 | #endif | |
713 | #endif /* DBG_MIN_SIZE */ | |
714 | ||
715 | #ifdef DBG_MEMORY_MAP | |
716 | memcpy (p, ";qXfer:memory-map:read+", 23); | |
717 | p += 23; | |
718 | #endif | |
719 | *p = '\0'; | |
720 | return 0; | |
721 | } | |
722 | #ifdef DBG_MEMORY_MAP | |
723 | if (memcmp (buffer + 1, "Xfer:memory-map:read:", 21) == 0) | |
724 | { | |
725 | p = strchr (buffer + 1 + 21, ':'); | |
726 | if (p == NULL) | |
727 | return 1; | |
728 | ++p; | |
729 | unsigned offset = hex2int (&p); | |
730 | if (*p++ != ',') | |
731 | return 2; | |
732 | unsigned length = hex2int (&p); | |
733 | if (length == 0) | |
734 | return 3; | |
735 | if (length > DBG_PACKET_SIZE) | |
736 | return 4; | |
737 | read_memory_map (buffer, offset, length); | |
738 | return 0; | |
739 | } | |
740 | #endif | |
741 | #ifndef DBG_MIN_SIZE | |
742 | if (memcmp (&buffer[1], "Attached", 9) == 0) | |
743 | { | |
744 | /* Just report that GDB attached to existing process | |
745 | if it is not applicable for you, then send patches */ | |
746 | memcpy(buffer, "1", 2); | |
747 | return 0; | |
748 | } | |
749 | #endif /* DBG_MIN_SIZE */ | |
750 | *buffer = '\0'; | |
751 | return -1; | |
752 | } | |
753 | ||
754 | static signed char | |
755 | process_g (char *buffer) FASTCALL | |
756 | { | |
757 | mem2hex (buffer, state, NUMREGBYTES); | |
758 | return 0; | |
759 | } | |
760 | ||
761 | static signed char | |
762 | process_G (char *buffer) FASTCALL | |
763 | { | |
764 | hex2mem (state, &buffer[1], NUMREGBYTES); | |
765 | /* OK response */ | |
766 | *buffer = '\0'; | |
767 | return 0; | |
768 | } | |
769 | ||
770 | static signed char | |
771 | process_m (char *buffer) FASTCALL | |
772 | {/* mAA..AA,LLLL Read LLLL bytes at address AA..AA */ | |
773 | char *p = &buffer[1]; | |
774 | byte *addr = (void*)hex2int(&p); | |
775 | if (*p++ != ',') | |
776 | return 1; | |
777 | unsigned len = (unsigned)hex2int(&p); | |
778 | if (len == 0) | |
779 | return 2; | |
780 | if (len > DBG_PACKET_SIZE/2) | |
781 | return 3; | |
782 | p = buffer; | |
783 | #ifdef DBG_MEMCPY | |
784 | do | |
785 | { | |
786 | byte tmp[16]; | |
787 | unsigned tlen = sizeof(tmp); | |
788 | if (tlen > len) | |
789 | tlen = len; | |
790 | if (!DBG_MEMCPY(tmp, addr, tlen)) | |
791 | return 4; | |
792 | p = mem2hex (p, tmp, tlen); | |
793 | addr += tlen; | |
794 | len -= tlen; | |
795 | } | |
796 | while (len); | |
797 | #else | |
798 | p = mem2hex (p, addr, len); | |
799 | #endif | |
800 | return 0; | |
801 | } | |
802 | ||
803 | static signed char | |
804 | process_M (char *buffer) FASTCALL | |
805 | {/* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */ | |
806 | char *p = &buffer[1]; | |
807 | byte *addr = (void*)hex2int(&p); | |
808 | if (*p != ',') | |
809 | return 1; | |
810 | ++p; | |
811 | unsigned len = (unsigned)hex2int(&p); | |
812 | if (*p++ != ':') | |
813 | return 2; | |
814 | if (len == 0) | |
815 | goto end; | |
816 | if (len*2 + (p - buffer) > DBG_PACKET_SIZE) | |
817 | return 3; | |
818 | #ifdef DBG_MEMCPY | |
819 | do | |
820 | { | |
821 | byte tmp[16]; | |
822 | unsigned tlen = sizeof(tmp); | |
823 | if (tlen > len) | |
824 | tlen = len; | |
825 | p = hex2mem (tmp, p, tlen); | |
826 | if (!DBG_MEMCPY(addr, tmp, tlen)) | |
827 | return 4; | |
828 | addr += tlen; | |
829 | len -= tlen; | |
830 | } | |
831 | while (len); | |
832 | #else | |
833 | hex2mem (addr, p, len); | |
834 | #endif | |
835 | end: | |
836 | /* OK response */ | |
837 | *buffer = '\0'; | |
838 | return 0; | |
839 | } | |
840 | ||
841 | #ifndef DBG_MIN_SIZE | |
842 | static signed char | |
843 | process_X (char *buffer) FASTCALL | |
844 | {/* XAA..AA,LLLL: Write LLLL binary bytes at address AA.AA return OK */ | |
845 | char *p = &buffer[1]; | |
846 | byte *addr = (void*)hex2int(&p); | |
847 | if (*p != ',') | |
848 | return 1; | |
849 | ++p; | |
850 | unsigned len = (unsigned)hex2int(&p); | |
851 | if (*p++ != ':') | |
852 | return 2; | |
853 | if (len == 0) | |
854 | goto end; | |
855 | if (len + (p - buffer) > DBG_PACKET_SIZE) | |
856 | return 3; | |
857 | #ifdef DBG_MEMCPY | |
858 | if (!DBG_MEMCPY(addr, p, len)) | |
859 | return 4; | |
860 | #else | |
861 | memcpy (addr, p, len); | |
862 | #endif | |
863 | end: | |
864 | /* OK response */ | |
865 | *buffer = '\0'; | |
866 | return 0; | |
867 | } | |
868 | #else /* DBG_MIN_SIZE */ | |
869 | static signed char | |
870 | process_X (char *buffer) FASTCALL | |
871 | { | |
872 | (void)buffer; | |
873 | return -1; | |
874 | } | |
875 | #endif /* DBG_MIN_SIZE */ | |
876 | ||
877 | static signed char | |
878 | process_c (char *buffer) FASTCALL | |
879 | {/* 'cAAAA' - Continue at address AAAA(optional) */ | |
880 | const char *p = &buffer[1]; | |
881 | if (*p != '\0') | |
882 | { | |
883 | void *addr = (void*)hex2int(&p); | |
884 | set_reg_value (&state[R_PC], addr); | |
885 | } | |
886 | rest_cpu_state (); | |
887 | return 0; | |
888 | } | |
889 | ||
890 | static signed char | |
891 | process_D (char *buffer) FASTCALL | |
892 | {/* 'D' - detach the program: continue execution */ | |
893 | *buffer = '\0'; | |
894 | return -2; | |
895 | } | |
896 | ||
897 | static signed char | |
898 | process_k (char *buffer) FASTCALL | |
899 | {/* 'k' - Kill the program */ | |
900 | set_reg_value (&state[R_PC], 0); | |
901 | rest_cpu_state (); | |
902 | (void)buffer; | |
903 | return 0; | |
904 | } | |
905 | ||
906 | static signed char | |
907 | process_v (char *buffer) FASTCALL | |
908 | { | |
909 | #ifndef DBG_MIN_SIZE | |
910 | if (memcmp (&buffer[1], "Cont", 4) == 0) | |
911 | { | |
912 | if (buffer[5] == '?') | |
913 | { | |
914 | /* result response will be "vCont;c;C"; C action must be | |
915 | supported too, because GDB reguires at lease both of them */ | |
916 | memcpy (&buffer[5], ";c;C", 5); | |
917 | return 0; | |
918 | } | |
919 | buffer[0] = '\0'; | |
920 | if (buffer[5] == ';' && (buffer[6] == 'c' || buffer[6] == 'C')) | |
921 | return -2; /* resume execution */ | |
922 | return 1; | |
923 | } | |
924 | #endif /* DBG_MIN_SIZE */ | |
925 | return -1; | |
926 | } | |
927 | ||
928 | static signed char | |
929 | process_zZ (char *buffer) FASTCALL | |
930 | { /* insert/remove breakpoint */ | |
931 | #if defined(DBG_SWBREAK_PROC) || defined(DBG_HWBREAK) || \ | |
932 | defined(DBG_WWATCH) || defined(DBG_RWATCH) || defined(DBG_AWATCH) | |
933 | const byte set = (*buffer == 'Z'); | |
934 | const char *p = &buffer[3]; | |
935 | void *addr = (void*)hex2int(&p); | |
936 | if (*p != ',') | |
937 | return 1; | |
938 | p++; | |
939 | int kind = hex2int(&p); | |
940 | *buffer = '\0'; | |
941 | switch (buffer[1]) | |
942 | { | |
943 | #ifdef DBG_SWBREAK_PROC | |
944 | case '0': /* sw break */ | |
945 | return DBG_SWBREAK_PROC(set, addr); | |
946 | #endif | |
947 | #ifdef DBG_HWBREAK | |
948 | case '1': /* hw break */ | |
949 | return DBG_HWBREAK(set, addr); | |
950 | #endif | |
951 | #ifdef DBG_WWATCH | |
952 | case '2': /* write watch */ | |
953 | return DBG_WWATCH(set, addr, kind); | |
954 | #endif | |
955 | #ifdef DBG_RWATCH | |
956 | case '3': /* read watch */ | |
957 | return DBG_RWATCH(set, addr, kind); | |
958 | #endif | |
959 | #ifdef DBG_AWATCH | |
960 | case '4': /* access watch */ | |
961 | return DBG_AWATCH(set, addr, kind); | |
962 | #endif | |
963 | default:; /* not supported */ | |
964 | } | |
965 | #endif | |
966 | (void)buffer; | |
967 | return -1; | |
968 | } | |
969 | ||
970 | static signed char | |
971 | do_process (char *buffer) FASTCALL | |
972 | { | |
973 | switch (*buffer) | |
974 | { | |
975 | case '?': return process_question (buffer); | |
976 | case 'G': return process_G (buffer); | |
977 | case 'k': return process_k (buffer); | |
978 | case 'M': return process_M (buffer); | |
979 | case 'X': return process_X (buffer); | |
980 | case 'Z': return process_zZ (buffer); | |
981 | case 'c': return process_c (buffer); | |
982 | case 'D': return process_D (buffer); | |
983 | case 'g': return process_g (buffer); | |
984 | case 'm': return process_m (buffer); | |
985 | case 'q': return process_q (buffer); | |
986 | case 'v': return process_v (buffer); | |
987 | case 'z': return process_zZ (buffer); | |
988 | default: return -1; /* empty response */ | |
989 | } | |
990 | } | |
991 | ||
992 | static char | |
993 | process (char *buffer) FASTCALL | |
994 | { | |
995 | signed char err = do_process (buffer); | |
996 | char *p = buffer; | |
997 | char ret = 1; | |
998 | if (err == -2) | |
999 | { | |
1000 | ret = 0; | |
1001 | err = 0; | |
1002 | } | |
1003 | if (err > 0) | |
1004 | { | |
1005 | *p++ = 'E'; | |
1006 | p = byte2hex (p, err); | |
1007 | *p = '\0'; | |
1008 | } | |
1009 | else if (err < 0) | |
1010 | { | |
1011 | *p = '\0'; | |
1012 | } | |
1013 | else if (*p == '\0') | |
1014 | memcpy(p, "OK", 3); | |
1015 | return ret; | |
1016 | } | |
1017 | ||
1018 | static char * | |
1019 | byte2hex (char *p, byte v) | |
1020 | { | |
1021 | *p++ = high_hex (v); | |
1022 | *p++ = low_hex (v); | |
1023 | return p; | |
1024 | } | |
1025 | ||
1026 | static signed char | |
1027 | hex2val (unsigned char hex) FASTCALL | |
1028 | { | |
1029 | if (hex <= '9') | |
1030 | return hex - '0'; | |
1031 | hex &= 0xdf; /* make uppercase */ | |
1032 | hex -= 'A' - 10; | |
1033 | return (hex >= 10 && hex < 16) ? hex : -1; | |
1034 | } | |
1035 | ||
1036 | static int | |
1037 | hex2byte (const char *p) FASTCALL | |
1038 | { | |
1039 | signed char h = hex2val (p[0]); | |
1040 | signed char l = hex2val (p[1]); | |
1041 | if (h < 0 || l < 0) | |
1042 | return -1; | |
1043 | return (byte)((byte)h << 4) | (byte)l; | |
1044 | } | |
1045 | ||
1046 | static int | |
1047 | hex2int (const char **buf) FASTCALL | |
1048 | { | |
1049 | word r = 0; | |
1050 | for (;; (*buf)++) | |
1051 | { | |
1052 | signed char a = hex2val(**buf); | |
1053 | if (a < 0) | |
1054 | break; | |
1055 | r <<= 4; | |
1056 | r += (byte)a; | |
1057 | } | |
1058 | return (int)r; | |
1059 | } | |
1060 | ||
1061 | static char * | |
1062 | int2hex (char *buf, int v) | |
1063 | { | |
1064 | buf = byte2hex(buf, (word)v >> 8); | |
1065 | return byte2hex(buf, (byte)v); | |
1066 | } | |
1067 | ||
1068 | static char | |
1069 | high_hex (byte v) FASTCALL | |
1070 | { | |
1071 | return low_hex(v >> 4); | |
1072 | } | |
1073 | ||
1074 | static char | |
1075 | low_hex (byte v) FASTCALL | |
1076 | { | |
1077 | /* | |
1078 | __asm | |
1079 | ld a, l | |
1080 | and a, #0x0f | |
1081 | add a, #0x90 | |
1082 | daa | |
1083 | adc a, #0x40 | |
1084 | daa | |
1085 | ld l, a | |
1086 | __endasm; | |
1087 | (void)v; | |
1088 | */ | |
1089 | v &= 0x0f; | |
1090 | v += '0'; | |
1091 | if (v < '9'+1) | |
1092 | return v; | |
1093 | return v + 'a' - '0' - 10; | |
1094 | } | |
1095 | ||
1096 | /* convert the memory, pointed to by mem into hex, placing result in buf */ | |
1097 | /* return a pointer to the last char put in buf (null) */ | |
1098 | static char * | |
1099 | mem2hex (char *buf, const byte *mem, unsigned bytes) | |
1100 | { | |
1101 | char *d = buf; | |
1102 | if (bytes != 0) | |
1103 | { | |
1104 | do | |
1105 | { | |
1106 | d = byte2hex (d, *mem++); | |
1107 | } | |
1108 | while (--bytes); | |
1109 | } | |
1110 | *d = 0; | |
1111 | return d; | |
1112 | } | |
1113 | ||
1114 | /* convert the hex array pointed to by buf into binary, to be placed in mem | |
1115 | return a pointer to the character after the last byte written */ | |
1116 | ||
1117 | static const char * | |
1118 | hex2mem (byte *mem, const char *buf, unsigned bytes) | |
1119 | { | |
1120 | if (bytes != 0) | |
1121 | { | |
1122 | do | |
1123 | { | |
1124 | *mem++ = hex2byte (buf); | |
1125 | buf += 2; | |
1126 | } | |
1127 | while (--bytes); | |
1128 | } | |
1129 | return buf; | |
1130 | } | |
1131 | ||
1132 | #ifdef DBG_MEMORY_MAP | |
1133 | static void | |
1134 | read_memory_map (char *buffer, unsigned offset, unsigned length) | |
1135 | { | |
1136 | const char *map = DBG_MEMORY_MAP; | |
1137 | const unsigned map_sz = strlen(map); | |
1138 | if (offset >= map_sz) | |
1139 | { | |
1140 | buffer[0] = 'l'; | |
1141 | buffer[1] = '\0'; | |
1142 | return; | |
1143 | } | |
1144 | if (offset + length > map_sz) | |
1145 | length = map_sz - offset; | |
1146 | buffer[0] = 'm'; | |
1147 | memcpy (&buffer[1], &map[offset], length); | |
1148 | buffer[1+length] = '\0'; | |
1149 | } | |
1150 | #endif | |
1151 | ||
1152 | /* write string like " nn:0123" and return pointer after it */ | |
1153 | #ifndef DBG_MIN_SIZE | |
1154 | static char * | |
1155 | format_reg_value (char *p, unsigned reg_num, const byte *value) | |
1156 | { | |
1157 | char *d = p; | |
1158 | unsigned char i; | |
1159 | d = byte2hex(d, reg_num); | |
1160 | *d++ = ':'; | |
1161 | value += REG_SIZE; | |
1162 | i = REG_SIZE; | |
1163 | do | |
1164 | { | |
1165 | d = byte2hex(d, *--value); | |
1166 | } | |
1167 | while (--i != 0); | |
1168 | *d++ = ';'; | |
1169 | return d; | |
1170 | } | |
1171 | #endif /* DBG_MIN_SIZE */ | |
1172 | ||
1173 | #ifdef __SDCC_gbz80 | |
1174 | /* saves all state.except PC and SP */ | |
1175 | static void | |
1176 | save_cpu_state() __naked | |
1177 | { | |
1178 | __asm | |
1179 | push af | |
1180 | ld a, l | |
1181 | ld (#_state + R_HL + 0), a | |
1182 | ld a, h | |
1183 | ld (#_state + R_HL + 1), a | |
1184 | ld hl, #_state + R_HL - 1 | |
1185 | ld (hl), d | |
1186 | dec hl | |
1187 | ld (hl), e | |
1188 | dec hl | |
1189 | ld (hl), b | |
1190 | dec hl | |
1191 | ld (hl), c | |
1192 | dec hl | |
1193 | pop bc | |
1194 | ld (hl), b | |
1195 | dec hl | |
1196 | ld (hl), c | |
1197 | ret | |
1198 | __endasm; | |
1199 | } | |
1200 | ||
1201 | /* restore CPU state and continue execution */ | |
1202 | static void | |
1203 | rest_cpu_state() __naked | |
1204 | { | |
1205 | __asm | |
1206 | ;restore SP | |
1207 | ld a, (#_state + R_SP + 0) | |
1208 | ld l,a | |
1209 | ld a, (#_state + R_SP + 1) | |
1210 | ld h,a | |
1211 | ld sp, hl | |
1212 | ;push PC value as return address | |
1213 | ld a, (#_state + R_PC + 0) | |
1214 | ld l, a | |
1215 | ld a, (#_state + R_PC + 1) | |
1216 | ld h, a | |
1217 | push hl | |
1218 | ;restore registers | |
1219 | ld hl, #_state + R_AF | |
1220 | ld c, (hl) | |
1221 | inc hl | |
1222 | ld b, (hl) | |
1223 | inc hl | |
1224 | push bc | |
1225 | ld c, (hl) | |
1226 | inc hl | |
1227 | ld b, (hl) | |
1228 | inc hl | |
1229 | ld e, (hl) | |
1230 | inc hl | |
1231 | ld d, (hl) | |
1232 | inc hl | |
1233 | ld a, (hl) | |
1234 | inc hl | |
1235 | ld h, (hl) | |
1236 | ld l, a | |
1237 | pop af | |
1238 | ret | |
1239 | __endasm; | |
1240 | } | |
1241 | #else | |
1242 | /* saves all state.except PC and SP */ | |
1243 | static void | |
1244 | save_cpu_state() __naked | |
1245 | { | |
1246 | __asm | |
1247 | ld (#_state + R_HL), hl | |
1248 | ld (#_state + R_DE), de | |
1249 | ld (#_state + R_BC), bc | |
1250 | push af | |
1251 | pop hl | |
1252 | ld (#_state + R_AF), hl | |
1253 | ld a, r ;R is increased by 7 or by 8 if called via RST | |
1254 | ld l, a | |
1255 | sub a, #7 | |
1256 | xor a, l | |
1257 | and a, #0x7f | |
1258 | xor a, l | |
1259 | #ifdef __SDCC_ez80_adl | |
1260 | ld hl, i | |
1261 | ex de, hl | |
1262 | ld hl, #_state + R_IR | |
1263 | ld (hl), a | |
1264 | inc hl | |
1265 | ld (hl), e | |
1266 | inc hl | |
1267 | ld (hl), d | |
1268 | ld a, MB | |
1269 | ld (#_state + R_AF+2), a | |
1270 | #else | |
1271 | ld l, a | |
1272 | ld a, i | |
1273 | ld h, a | |
1274 | ld (#_state + R_IR), hl | |
1275 | #endif /* __SDCC_ez80_adl */ | |
1276 | ld (#_state + R_IX), ix | |
1277 | ld (#_state + R_IY), iy | |
1278 | ex af, af' ;' | |
1279 | exx | |
1280 | ld (#_state + R_HL_), hl | |
1281 | ld (#_state + R_DE_), de | |
1282 | ld (#_state + R_BC_), bc | |
1283 | push af | |
1284 | pop hl | |
1285 | ld (#_state + R_AF_), hl | |
1286 | ret | |
1287 | __endasm; | |
1288 | } | |
1289 | ||
1290 | /* restore CPU state and continue execution */ | |
1291 | static void | |
1292 | rest_cpu_state() __naked | |
1293 | { | |
1294 | __asm | |
1295 | #ifdef DBG_USE_TRAMPOLINE | |
1296 | ld sp, _stack + DBG_STACK_SIZE | |
1297 | ld hl, (#_state + R_PC) | |
1298 | push hl /* resume address */ | |
1299 | #ifdef __SDCC_ez80_adl | |
1300 | ld hl, 0xc30000 ; use 0xc34000 for jp.s | |
1301 | #else | |
1302 | ld hl, 0xc300 | |
1303 | #endif | |
1304 | push hl /* JP opcode */ | |
1305 | #endif /* DBG_USE_TRAMPOLINE */ | |
1306 | ld hl, (#_state + R_AF_) | |
1307 | push hl | |
1308 | pop af | |
1309 | ld bc, (#_state + R_BC_) | |
1310 | ld de, (#_state + R_DE_) | |
1311 | ld hl, (#_state + R_HL_) | |
1312 | exx | |
1313 | ex af, af' ;' | |
1314 | ld iy, (#_state + R_IY) | |
1315 | ld ix, (#_state + R_IX) | |
1316 | #ifdef __SDCC_ez80_adl | |
1317 | ld a, (#_state + R_AF + 2) | |
1318 | ld MB, a | |
1319 | ld hl, (#_state + R_IR + 1) ;I register | |
1320 | ld i, hl | |
1321 | ld a, (#_state + R_IR + 0) ; R register | |
1322 | ld l, a | |
1323 | #else | |
1324 | ld hl, (#_state + R_IR) | |
1325 | ld a, h | |
1326 | ld i, a | |
1327 | ld a, l | |
1328 | #endif /* __SDCC_ez80_adl */ | |
1329 | sub a, #10 ;number of M1 cycles after ld r,a | |
1330 | xor a, l | |
1331 | and a, #0x7f | |
1332 | xor a, l | |
1333 | ld r, a | |
1334 | ld de, (#_state + R_DE) | |
1335 | ld bc, (#_state + R_BC) | |
1336 | ld hl, (#_state + R_AF) | |
1337 | push hl | |
1338 | pop af | |
1339 | ld sp, (#_state + R_SP) | |
1340 | #ifndef DBG_USE_TRAMPOLINE | |
1341 | ld hl, (#_state + R_PC) | |
1342 | push hl | |
1343 | ld hl, (#_state + R_HL) | |
1344 | DBG_RESUME | |
1345 | #else | |
1346 | ld hl, (#_state + R_HL) | |
1347 | #ifdef __SDCC_ez80_adl | |
1348 | jp #_stack + DBG_STACK_SIZE - 4 | |
1349 | #else | |
1350 | jp #_stack + DBG_STACK_SIZE - 3 | |
1351 | #endif | |
1352 | #endif /* DBG_USE_TRAMPOLINE */ | |
1353 | __endasm; | |
1354 | } | |
1355 | #endif /* __SDCC_gbz80 */ |