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c906108c SS |
1 | /* This file is part of the program psim. |
2 | ||
3 | Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au> | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | ||
19 | */ | |
20 | ||
21 | ||
22 | #ifndef _EMUL_BUGAPI_C_ | |
23 | #define _EMUL_BUGAPI_C_ | |
24 | ||
25 | /* Note: this module is called via a table. There is no benefit in | |
26 | making it inline */ | |
27 | ||
28 | #include "emul_generic.h" | |
29 | #include "emul_bugapi.h" | |
30 | ||
31 | #ifdef HAVE_UNISTD_H | |
32 | #include <unistd.h> | |
33 | #endif | |
34 | ||
35 | #ifdef HAVE_STDLIB_H | |
36 | #include <stdlib.h> | |
37 | #endif | |
38 | ||
39 | #ifdef HAVE_STRING_H | |
40 | #include <string.h> | |
41 | #else | |
42 | #ifdef HAVE_STRINGS_H | |
43 | #include <strings.h> | |
44 | #endif | |
45 | #endif | |
46 | ||
47 | ||
48 | /* EMULATION | |
49 | ||
50 | BUG - Motorola's embeded firmware BUG interface | |
51 | ||
52 | DESCRIPTION | |
53 | ||
54 | ||
55 | ||
56 | */ | |
57 | ||
58 | ||
59 | /* from PowerPCBug Debugging Package User's Manual, part 2 of 2 and also bug.S - Dale Rahn */ | |
60 | #define _INCHR 0x000 /* Input character */ | |
61 | #define _INSTAT 0x001 /* Input serial port status */ | |
62 | #define _INLN 0x002 /* Input line (pointer / pointer format) */ | |
63 | #define _READSTR 0x003 /* Input string (pointer / count format) */ | |
64 | #define _READLN 0x004 /* Input line (pointer / count format) */ | |
65 | #define _CHKBRK 0x005 /* Check for break */ | |
66 | #define _DSKRD 0x010 /* Disk read */ | |
67 | #define _DSKWR 0x011 /* Disk write */ | |
68 | #define _DSKCFIG 0x012 /* Disk configure */ | |
69 | #define _DSKFMT 0x014 /* Disk format */ | |
70 | #define _DSKCTRL 0x015 /* Disk control */ | |
71 | #define _NETRD 0x018 /* Read from host */ | |
72 | #define _NETWR 0x019 /* Write to host */ | |
73 | #define _NETCFIG 0x01a /* Configure network parameters */ | |
74 | #define _NETOPN 0x01b /* Open file for reading */ | |
75 | #define _NETFRD 0x01c /* Retreive specified file blocks */ | |
76 | #define _NETCTRL 0x01d /* Implement special control functions */ | |
77 | #define _OUTCHR 0x020 /* Output character (pointer / pointer format) */ | |
78 | #define _OUTSTR 0x021 /* Output string (pointer / pointer format) */ | |
79 | #define _OUTLN 0x022 /* Output line (pointer / pointer format) */ | |
80 | #define _WRITE 0x023 /* Output string (pointer / count format) */ | |
81 | #define _WRITELN 0x024 /* Output line (pointer / count format) */ | |
82 | #define _WRITDLN 0x025 /* Output line with data (pointer / count format) */ | |
83 | #define _PCRLF 0x026 /* Output carriage return and line feed */ | |
84 | #define _ERASLN 0x027 /* Erase line */ | |
85 | #define _WRITD 0x028 /* Output string with data (pointer / count format) */ | |
86 | #define _SNDBRK 0x029 /* Send break */ | |
87 | #define _DELAY 0x043 /* Timer delay */ | |
88 | #define _RTC_TM 0x050 /* Time initialization for RTC */ | |
89 | #define _RTC_DT 0x051 /* Date initialization for RTC */ | |
90 | #define _RTC_DSP 0x052 /* Display RTC time and date */ | |
91 | #define _RTC_RD 0x053 /* Read the RTC registers */ | |
92 | #define _REDIR 0x060 /* Redirect I/O of a system call function */ | |
93 | #define _REDIR_I 0x061 /* Redirect input */ | |
94 | #define _REDIR_O 0x062 /* Redirect output */ | |
95 | #define _RETURN 0x063 /* Return to PPCbug */ | |
96 | #define _BINDEC 0x064 /* Convert binary to binary coded decimal (BCD) */ | |
97 | #define _CHANGEV 0x067 /* Parse value */ | |
98 | #define _STRCMP 0x068 /* Compare two strings (pointer / count format) */ | |
99 | #define _MULU32 0x069 /* Multiply two 32-bit unsigned integers */ | |
100 | #define _DIVU32 0x06a /* Divide two 32-bit unsigned integers */ | |
101 | #define _CHK_SUM 0x06b /* Generate checksum */ | |
102 | #define _BRD_ID 0x070 /* Return pointer to board ID packet */ | |
103 | #define _ENVIRON 0x071 /* Access boot environment parameters */ | |
104 | #define _DIAGFCN 0x074 /* Diagnostic function(s) */ | |
105 | #define _SIOPEPS 0x090 /* Retrieve SCSI pointers */ | |
106 | #define _IOINQ 0x120 /* Port inquire */ | |
107 | #define _IOINFORM 0x124 /* Port inform */ | |
108 | #define _IOCONFIG 0x128 /* Port configure */ | |
109 | #define _IODELETE 0x12c /* Port delete */ | |
110 | #define _SYMBOLTA 0x130 /* Attach symbol table */ | |
111 | #define _SYMBOLDA 0x131 /* Detach symbol table */ | |
112 | ||
113 | struct bug_map { | |
114 | int value; | |
115 | const char *info; | |
116 | }; | |
117 | ||
118 | static const struct bug_map bug_mapping[] = { | |
119 | { _INCHR, ".INCHR -- Input character" }, | |
120 | { _INSTAT, ".INSTAT -- Input serial port status" }, | |
121 | { _INLN, ".INLN -- Input line (pointer / pointer format)" }, | |
122 | { _READSTR, ".READSTR -- Input string (pointer / count format)" }, | |
123 | { _READLN, ".READLN -- Input line (pointer / count format)" }, | |
124 | { _CHKBRK, ".CHKBRK -- Check for break" }, | |
125 | { _DSKRD, ".DSKRD -- Disk read" }, | |
126 | { _DSKWR, ".DSKWR -- Disk write" }, | |
127 | { _DSKCFIG, ".DSKCFIG -- Disk configure" }, | |
128 | { _DSKFMT, ".DSKFMT -- Disk format" }, | |
129 | { _DSKCTRL, ".DSKCTRL -- Disk control" }, | |
130 | { _NETRD, ".NETRD -- Read from host" }, | |
131 | { _NETWR, ".NETWR -- Write to host" }, | |
132 | { _NETCFIG, ".NETCFIG -- Configure network parameters" }, | |
133 | { _NETOPN, ".NETOPN -- Open file for reading" }, | |
134 | { _NETFRD, ".NETFRD -- Retreive specified file blocks" }, | |
135 | { _NETCTRL, ".NETCTRL -- Implement special control functions" }, | |
136 | { _OUTCHR, ".OUTCHR -- Output character" }, | |
137 | { _OUTSTR, ".OUTSTR -- Output string (pointer / pointer format)" }, | |
138 | { _OUTLN, ".OUTLN -- Output line (pointer / pointer format)" }, | |
139 | { _WRITE, ".WRITE -- Output string (pointer / count format)" }, | |
140 | { _WRITELN, ".WRITELN -- Output line (pointer / count format)" }, | |
141 | { _WRITDLN, ".WRITDLN -- Output line with data (pointer / count format)" }, | |
142 | { _PCRLF, ".PCRLF -- Output carriage return and line feed" }, | |
143 | { _ERASLN, ".ERASLN -- Erase line" }, | |
144 | { _WRITD, ".WRITD -- Output string with data (pointer / count format)" }, | |
145 | { _SNDBRK, ".SNDBRK -- Send break" }, | |
146 | { _DELAY, ".DELAY -- Timer delay" }, | |
147 | { _RTC_TM, ".RTC_TM -- Time initialization for RTC" }, | |
148 | { _RTC_DT, ".RTC_DT -- Date initialization for RTC" }, | |
149 | { _RTC_DSP, ".RTC_DSP -- Display RTC time and date" }, | |
150 | { _RTC_RD, ".RTC_RD -- Read the RTC registers" }, | |
151 | { _REDIR, ".REDIR -- Redirect I/O of a system call function" }, | |
152 | { _REDIR, ".REDIR -- Redirect input" }, | |
153 | { _REDIR, ".REDIR -- Redirect output" }, | |
154 | { _RETURN, ".RETURN -- Return to PPCbug" }, | |
155 | { _BINDEC, ".BINDEC -- Convert binary to binary coded decimal (BCD)" }, | |
156 | { _CHANGEV, ".CHANGEV -- Parse value" }, | |
157 | { _STRCMP, ".STRCMP -- Compare two strings (pointer / count format)" }, | |
158 | { _MULU32, ".MULU32 -- Multiply two 32-bit unsigned integers" }, | |
159 | { _DIVU32, ".DIVU32 -- Divide two 32-bit unsigned integers" }, | |
160 | { _CHK_SUM, ".CHK_SUM -- Generate checksum" }, | |
161 | { _BRD_ID, ".BRD_ID -- Return pointer to board ID packet" }, | |
162 | { _ENVIRON, ".ENVIRON -- Access boot environment parameters" }, | |
163 | { _DIAGFCN, ".DIAGFCN -- Diagnostic function(s)" }, | |
164 | { _SIOPEPS, ".SIOPEPS -- Retrieve SCSI pointers" }, | |
165 | { _IOINQ, ".IOINQ -- Port inquire" }, | |
166 | { _IOINFORM, ".IOINFORM -- Port inform" }, | |
167 | { _IOCONFIG, ".IOCONFIG -- Port configure" }, | |
168 | { _IODELETE, ".IODELETE -- Port delete" }, | |
169 | { _SYMBOLTA, ".SYMBOLTA -- Attach symbol table" }, | |
170 | { _SYMBOLDA, ".SYMBOLDA -- Detach symbol table" }, | |
171 | }; | |
172 | ||
173 | #ifndef BUGAPI_END_ADDRESS | |
174 | #define BUGAPI_END_ADDRESS 0x100000 | |
175 | #endif | |
176 | ||
177 | enum { | |
178 | nr_bugapi_disks = 2, | |
179 | }; | |
180 | ||
181 | ||
182 | struct _os_emul_data { | |
183 | device *root; | |
184 | unsigned_word memory_size; | |
185 | unsigned_word top_of_stack; | |
186 | int interrupt_prefix; | |
187 | unsigned_word interrupt_vector_address; | |
188 | unsigned_word system_call_address; | |
189 | unsigned_word stall_cpu_loop_address; | |
190 | int little_endian; | |
191 | int floating_point_available; | |
192 | /* I/O devices */ | |
193 | device_instance *output; | |
194 | device_instance *input; | |
195 | device_instance *(disk[nr_bugapi_disks]); | |
196 | }; | |
197 | ||
198 | ||
199 | static os_emul_data * | |
200 | emul_bugapi_create(device *root, | |
201 | bfd *image, | |
202 | const char *name) | |
203 | { | |
204 | device *node; | |
205 | os_emul_data *bugapi; | |
206 | ||
207 | /* check it really is for us */ | |
208 | if (name != NULL | |
209 | && strcmp(name, "bugapi") != 0 | |
210 | && strcmp(name, "bug") != 0) | |
211 | return NULL; | |
212 | if (image != NULL | |
213 | && name == NULL | |
214 | && bfd_get_start_address(image) >= BUGAPI_END_ADDRESS) | |
215 | return NULL; | |
216 | ||
217 | bugapi = ZALLOC(os_emul_data); | |
218 | ||
219 | /* options */ | |
220 | emul_add_tree_options(root, image, "bug", "oea", | |
221 | 1 /*oea-interrupt-prefix*/); | |
222 | ||
223 | /* add some real hardware, include eeprom memory for the eeprom trap | |
224 | addresses */ | |
225 | emul_add_tree_hardware(root); | |
226 | node = tree_parse(root, "/openprom/memory@0xfff00000"); | |
227 | tree_parse(node, "./psim,description \"eeprom trap addresses"); | |
228 | tree_parse(node, "./reg 0xfff00000 0x3000"); | |
229 | ||
230 | bugapi->root = root; | |
231 | ||
232 | bugapi->memory_size | |
233 | = tree_find_integer_property(root, "/openprom/options/oea-memory-size"); | |
234 | bugapi->interrupt_prefix = | |
235 | tree_find_integer_property(root, "/openprom/options/oea-interrupt-prefix"); | |
236 | bugapi->interrupt_vector_address = (bugapi->interrupt_prefix | |
237 | ? MASK(0, 43) | |
238 | : 0); | |
239 | bugapi->system_call_address = (bugapi->interrupt_vector_address + 0x00c00); | |
240 | bugapi->stall_cpu_loop_address = (bugapi->system_call_address + 0x000f0); | |
241 | bugapi->top_of_stack = bugapi->memory_size - 0x1000; | |
242 | bugapi->little_endian | |
243 | = tree_find_boolean_property(root, "/options/little-endian?"); | |
244 | bugapi->floating_point_available | |
245 | = tree_find_boolean_property(root, "/openprom/options/floating-point?"); | |
246 | bugapi->input = NULL; | |
247 | bugapi->output = NULL; | |
248 | ||
249 | /* initialization */ | |
250 | if (image != NULL) | |
251 | tree_parse(root, "/openprom/init/register/0.pc 0x%lx", | |
252 | (unsigned long)bfd_get_start_address(image)); | |
253 | tree_parse(root, "/openprom/init/register/pc 0x%lx", | |
254 | (unsigned long)bugapi->stall_cpu_loop_address); | |
255 | tree_parse(root, "/openprom/init/register/sp 0x%lx", | |
256 | (unsigned long)(bugapi->top_of_stack - 16)); | |
257 | tree_parse(root, "/openprom/init/register/msr 0x%x", | |
258 | (msr_recoverable_interrupt | |
259 | | (bugapi->little_endian | |
260 | ? (msr_little_endian_mode | |
261 | | msr_interrupt_little_endian_mode) | |
262 | : 0) | |
263 | | (bugapi->floating_point_available | |
264 | ? msr_floating_point_available | |
265 | : 0) | |
266 | | (bugapi->interrupt_prefix | |
267 | ? msr_interrupt_prefix | |
268 | : 0) | |
269 | )); | |
270 | ||
271 | /* patch the system call instruction to call this emulation and then | |
272 | do an rfi */ | |
273 | node = tree_parse(root, "/openprom/init/data@0x%lx", | |
274 | (unsigned long)bugapi->system_call_address); | |
275 | tree_parse(node, "./psim,description \"system-call trap instruction"); | |
276 | tree_parse(node, "./real-address 0x%lx", | |
277 | (unsigned long)bugapi->system_call_address); | |
278 | tree_parse(node, "./data 0x%x", emul_call_instruction); | |
279 | node = tree_parse(root, "/openprom/init/data@0x%lx", | |
280 | (unsigned long)bugapi->system_call_address + 4); | |
281 | tree_parse(node, "./psim,description \"return from interrupt instruction"); | |
282 | tree_parse(node, "./real-address 0x%lx", | |
283 | (unsigned long)bugapi->system_call_address + 4); | |
284 | tree_parse(node, "./data 0x%x", | |
285 | emul_rfi_instruction); | |
286 | ||
287 | /* patch the end of the system call instruction so that it contains | |
288 | a loop to self instruction and point all the cpu's at this */ | |
289 | node = tree_parse(root, "/openprom/init/data@0x%lx", | |
290 | (unsigned long)bugapi->stall_cpu_loop_address); | |
291 | tree_parse(node, "./psim,description \"cpu-loop instruction"); | |
292 | tree_parse(node, "./real-address 0x%lx", | |
293 | (unsigned long)bugapi->stall_cpu_loop_address); | |
294 | tree_parse(node, "./data 0x%lx", | |
295 | (unsigned long)emul_loop_instruction); | |
296 | ||
297 | if (image != NULL) | |
298 | tree_parse(root, "/openprom/init/stack/stack-type %s", | |
299 | (image->xvec->flavour == bfd_target_elf_flavour | |
300 | ? "ppc-elf" | |
301 | : "ppc-xcoff")); | |
302 | ||
303 | if (image != NULL) | |
304 | tree_parse(root, "/openprom/init/load-binary/file-name \"%s", | |
305 | bfd_get_filename(image)); | |
306 | ||
307 | return bugapi; | |
308 | } | |
309 | ||
310 | static void | |
311 | emul_bugapi_init(os_emul_data *bugapi, | |
312 | int nr_cpus) | |
313 | { | |
314 | int i; | |
315 | /* get the current input/output devices that were created during | |
316 | device tree initialization */ | |
317 | bugapi->input = tree_find_ihandle_property(bugapi->root, "/chosen/stdin"); | |
318 | bugapi->output = tree_find_ihandle_property(bugapi->root, "/chosen/stdout"); | |
319 | /* if present, extract the selected disk devices */ | |
320 | for (i = 0; i < nr_bugapi_disks; i++) { | |
321 | char disk[32]; | |
322 | char *chp; | |
323 | strcpy(disk, "/chosen/disk0"); | |
324 | ASSERT(sizeof(disk) > strlen(disk)); | |
325 | chp = strchr(disk, '0'); | |
326 | *chp = *chp + i; | |
327 | if (tree_find_property(bugapi->root, disk) != NULL) | |
328 | bugapi->disk[i] = tree_find_ihandle_property(bugapi->root, disk); | |
329 | } | |
330 | } | |
331 | ||
332 | static const char * | |
333 | emul_bugapi_instruction_name(int call_id) | |
334 | { | |
335 | static char buffer[40]; | |
336 | int i; | |
337 | ||
338 | for (i = 0; i < sizeof (bug_mapping) / sizeof (bug_mapping[0]); i++) | |
339 | { | |
340 | if (bug_mapping[i].value == call_id) | |
341 | return bug_mapping[i].info; | |
342 | } | |
343 | ||
344 | (void) sprintf (buffer, "Unknown bug call 0x%x", call_id); | |
345 | return buffer; | |
346 | } | |
347 | ||
348 | static int | |
349 | emul_bugapi_do_read(os_emul_data *bugapi, | |
350 | cpu *processor, | |
351 | unsigned_word cia, | |
352 | unsigned_word buf, | |
353 | int nbytes) | |
354 | { | |
355 | unsigned char *scratch_buffer; | |
356 | int status; | |
357 | ||
358 | /* get a tempoary bufer */ | |
359 | scratch_buffer = (unsigned char *) zalloc(nbytes); | |
360 | ||
361 | /* check if buffer exists by reading it */ | |
362 | emul_read_buffer((void *)scratch_buffer, buf, nbytes, processor, cia); | |
363 | ||
364 | /* read */ | |
365 | status = device_instance_read(bugapi->input, | |
366 | (void *)scratch_buffer, nbytes); | |
367 | ||
368 | /* -1 = error, -2 = nothing available - see "serial" [IEEE1275] */ | |
369 | if (status < 0) { | |
370 | status = 0; | |
371 | } | |
372 | ||
373 | if (status > 0) { | |
374 | emul_write_buffer((void *)scratch_buffer, buf, status, processor, cia); | |
375 | ||
376 | /* Bugapi chops off the trailing n, but leaves it in the buffer */ | |
377 | if (scratch_buffer[status-1] == '\n' || scratch_buffer[status-1] == '\r') | |
378 | status--; | |
379 | } | |
380 | ||
381 | zfree(scratch_buffer); | |
382 | return status; | |
383 | } | |
384 | ||
385 | static void | |
386 | emul_bugapi_do_diskio(os_emul_data *bugapi, | |
387 | cpu *processor, | |
388 | unsigned_word cia, | |
389 | unsigned_word descriptor_addr, | |
390 | int call_id) | |
391 | { | |
392 | struct dskio_descriptor { | |
393 | unsigned_1 ctrl_lun; | |
394 | unsigned_1 dev_lun; | |
395 | unsigned_2 status; | |
396 | unsigned_word pbuffer; | |
397 | unsigned_4 blk_num; | |
398 | unsigned_2 blk_cnt; | |
399 | unsigned_1 flag; | |
400 | #define BUG_FILE_MARK 0x80 | |
401 | #define IGNORE_FILENUM 0x02 | |
402 | #define END_OF_FILE 0x01 | |
403 | unsigned_1 addr_mod; | |
404 | } descriptor; | |
405 | int block; | |
406 | emul_read_buffer(&descriptor, descriptor_addr, sizeof(descriptor), | |
407 | processor, cia); | |
408 | T2H(descriptor.ctrl_lun); | |
409 | T2H(descriptor.dev_lun); | |
410 | T2H(descriptor.status); | |
411 | T2H(descriptor.pbuffer); | |
412 | T2H(descriptor.blk_num); | |
413 | T2H(descriptor.blk_cnt); | |
414 | T2H(descriptor.flag); | |
415 | T2H(descriptor.addr_mod); | |
416 | if (descriptor.dev_lun >= nr_bugapi_disks | |
417 | || bugapi->disk[descriptor.dev_lun] == NULL) { | |
418 | error("emul_bugapi_do_diskio: attempt to access unconfigured disk /chosen/disk%d", | |
419 | descriptor.dev_lun); | |
420 | } | |
421 | else { | |
422 | for (block = 0; block < descriptor.blk_cnt; block++) { | |
423 | device_instance *disk = bugapi->disk[descriptor.dev_lun]; | |
424 | unsigned_1 buf[512]; /*????*/ | |
425 | unsigned_word block_nr = descriptor.blk_num + block; | |
426 | unsigned_word byte_nr = block_nr * sizeof(buf); | |
427 | unsigned_word block_addr = descriptor.pbuffer + block*sizeof(buf); | |
428 | if (device_instance_seek(disk, 0, byte_nr) < 0) | |
429 | error("emul_bugapi_do_diskio: bad seek\n"); | |
430 | switch (call_id) { | |
431 | case _DSKRD: | |
432 | if (device_instance_read(disk, buf, sizeof(buf)) != sizeof(buf)) | |
433 | error("emul_`bugapi_do_diskio: bad read\n"); | |
434 | emul_write_buffer(buf, block_addr, sizeof(buf), processor, cia); | |
435 | break; | |
436 | case _DSKWR: | |
437 | emul_read_buffer(buf, block_addr, sizeof(buf), processor, cia); | |
438 | if (device_instance_write(disk, buf, sizeof(buf)) != sizeof(buf)) | |
439 | error("emul_bugapi_do_diskio: bad write\n"); | |
440 | break; | |
441 | default: | |
442 | error("emul_bugapi_do_diskio: bad switch\n"); | |
443 | } | |
444 | } | |
445 | } | |
446 | } | |
447 | ||
448 | static void | |
449 | emul_bugapi_do_write(os_emul_data *bugapi, | |
450 | cpu *processor, | |
451 | unsigned_word cia, | |
452 | unsigned_word buf, | |
453 | int nbytes, | |
454 | const char *suffix) | |
455 | { | |
456 | void *scratch_buffer = NULL; | |
457 | ||
458 | /* get a tempoary bufer */ | |
459 | if (nbytes > 0) | |
460 | { | |
461 | scratch_buffer = zalloc(nbytes); | |
462 | ||
463 | /* copy in */ | |
464 | emul_read_buffer(scratch_buffer, buf, nbytes, | |
465 | processor, cia); | |
466 | ||
467 | /* write */ | |
468 | device_instance_write(bugapi->output, scratch_buffer, nbytes); | |
469 | ||
470 | zfree(scratch_buffer); | |
471 | } | |
472 | ||
473 | if (suffix) | |
474 | device_instance_write(bugapi->output, suffix, strlen(suffix)); | |
475 | ||
476 | flush_stdoutput (); | |
477 | } | |
478 | ||
479 | static int | |
480 | emul_bugapi_instruction_call(cpu *processor, | |
481 | unsigned_word cia, | |
482 | unsigned_word ra, | |
483 | os_emul_data *bugapi) | |
484 | { | |
485 | const int call_id = cpu_registers(processor)->gpr[10]; | |
486 | unsigned char uc; | |
487 | ||
488 | #define MY_INDEX itable_instruction_call | |
489 | ITRACE (trace_os_emul, | |
490 | (" 0x%x %s, r3 = 0x%lx, r4 = 0x%lx\n", | |
491 | call_id, emul_bugapi_instruction_name (call_id), | |
492 | (long)cpu_registers(processor)->gpr[3], | |
493 | (long)cpu_registers(processor)->gpr[4]));; | |
494 | ||
495 | /* check that this isn't an invalid instruction */ | |
496 | if (cia != bugapi->system_call_address) | |
497 | return 0; | |
498 | ||
499 | switch (call_id) { | |
500 | default: | |
501 | error("emul-bugapi: unimplemented bugapi %s from address 0x%lx\n", | |
502 | emul_bugapi_instruction_name (call_id), SRR0); | |
503 | break; | |
504 | ||
505 | /* read a single character, output r3 = byte */ | |
506 | /* FIXME: Add support to unbuffer input */ | |
507 | case _INCHR: | |
508 | if (device_instance_read(bugapi->input, (void *)&uc, 1) <= 0) | |
509 | uc = 0; | |
510 | cpu_registers(processor)->gpr[3] = uc; | |
511 | break; | |
512 | ||
513 | /* read a line of at most 256 bytes, r3 = ptr to 1st byte, output r3 = ptr to last byte+1 */ | |
514 | case _INLN: | |
515 | cpu_registers(processor)->gpr[3] += emul_bugapi_do_read(bugapi, | |
516 | processor, cia, | |
517 | cpu_registers(processor)->gpr[3], | |
518 | 256); | |
519 | break; | |
520 | ||
521 | /* output a character, r3 = character */ | |
522 | case _OUTCHR: | |
523 | { | |
524 | char out = (char)cpu_registers(processor)->gpr[3]; | |
525 | device_instance_write(bugapi->output, &out, 1); | |
526 | break; | |
527 | } | |
528 | ||
529 | /* output a string, r3 = ptr to 1st byte, r4 = ptr to last byte+1 */ | |
530 | case _OUTSTR: | |
531 | emul_bugapi_do_write(bugapi, | |
532 | processor, cia, | |
533 | cpu_registers(processor)->gpr[3], | |
534 | cpu_registers(processor)->gpr[4] - cpu_registers(processor)->gpr[3], | |
535 | (const char *)0); | |
536 | break; | |
537 | ||
538 | /* output a string followed by \r\n, r3 = ptr to 1st byte, r4 = ptr to last byte+1 */ | |
539 | case _OUTLN: | |
540 | ||
541 | emul_bugapi_do_write(bugapi, | |
542 | processor, cia, | |
543 | cpu_registers(processor)->gpr[3], | |
544 | cpu_registers(processor)->gpr[4] - cpu_registers(processor)->gpr[3], | |
545 | "\n"); | |
546 | break; | |
547 | ||
548 | /* output a \r\n */ | |
549 | case _PCRLF: | |
550 | device_instance_write(bugapi->output, "\n", 1); | |
551 | break; | |
552 | ||
553 | /* read/write blocks of data to/from the disk */ | |
554 | case _DSKWR: | |
555 | case _DSKRD: | |
556 | emul_bugapi_do_diskio(bugapi, processor, cia, | |
557 | cpu_registers(processor)->gpr[3], | |
558 | call_id); | |
559 | break; | |
560 | ||
561 | /* return to ppcbug monitor (exiting with gpr[3] as status is not | |
562 | part of the bug monitor) */ | |
563 | case _RETURN: | |
564 | cpu_halt(processor, cia, was_exited, cpu_registers(processor)->gpr[3]); | |
565 | break; | |
566 | } | |
567 | return 1; | |
568 | /* the instruction following this one is a RFI. Thus by just | |
569 | continuing the return from system call is performed */ | |
570 | } | |
571 | ||
572 | const os_emul emul_bugapi = { | |
573 | "bugapi", | |
574 | emul_bugapi_create, | |
575 | emul_bugapi_init, | |
576 | 0, /*system_call*/ | |
577 | emul_bugapi_instruction_call, | |
578 | 0 /*data*/ | |
579 | }; | |
580 | ||
581 | #endif |