1 #include <console/console.h>
4 #if defined(CONFIG_GDB_STUB) && CONFIG_GDB_STUB == 1
6 /* BUFMAX defines the maximum number of characters in inbound/outbound buffers.
7 * At least NUM_REGBYTES*2 are needed for register packets
11 EAX = 0, ECX, EDX, EBX, ESP, EBP, ESI, EDI,
12 PC /* also known as eip */,
13 PS /* also known as eflags */,
14 CS, SS, DS, ES, FS, GS,
15 NUM_REGS /* Number of registers. */
18 static uint32_t gdb_stub_registers[NUM_REGS];
20 #define GDB_SIG0 0 /* Signal 0 */
21 #define GDB_SIGHUP 1 /* Hangup */
22 #define GDB_SIGINT 2 /* Interrupt */
23 #define GDB_SIGQUIT 3 /* Quit */
24 #define GDB_SIGILL 4 /* Illegal instruction */
25 #define GDB_SIGTRAP 5 /* Trace/breakpoint trap */
26 #define GDB_SIGABRT 6 /* Aborted */
27 #define GDB_SIGEMT 7 /* Emulation trap */
28 #define GDB_SIGFPE 8 /* Arithmetic exception */
29 #define GDB_SIGKILL 9 /* Killed */
30 #define GDB_SIGBUS 10 /* Bus error */
31 #define GDB_SIGSEGV 11 /* Segmentation fault */
32 #define GDB_SIGSYS 12 /* Bad system call */
33 #define GDB_SIGPIPE 13 /* Broken pipe */
34 #define GDB_SIGALRM 14 /* Alarm clock */
35 #define GDB_SIGTERM 15 /* Terminated */
36 #define GDB_SIGURG 16 /* Urgent I/O condition */
37 #define GDB_SIGSTOP 17 /* Stopped (signal) */
38 #define GDB_SIGTSTP 18 /* Stopped (user) */
39 #define GDB_SIGCONT 19 /* Continued */
40 #define GDB_SIGCHLD 20 /* Child status changed */
41 #define GDB_SIGTTIN 21 /* Stopped (tty input) */
42 #define GDB_SIGTTOU 22 /* Stopped (tty output) */
43 #define GDB_SIGIO 23 /* I/O possible */
44 #define GDB_SIGXCPU 24 /* CPU time limit exceeded */
45 #define GDB_SIGXFSZ 25 /* File size limit exceeded */
46 #define GDB_SIGVTALRM 26 /* Virtual timer expired */
47 #define GDB_SIGPROF 27 /* Profiling timer expired */
48 #define GDB_SIGWINCH 28 /* Window size changed */
49 #define GDB_SIGLOST 29 /* Resource lost */
50 #define GDB_SIGUSR1 30 /* User defined signal 1 */
51 #define GDB_SUGUSR2 31 /* User defined signal 2 */
52 #define GDB_SIGPWR 32 /* Power fail/restart */
53 #define GDB_SIGPOLL 33 /* Pollable event occurred */
54 #define GDB_SIGWIND 34 /* SIGWIND */
55 #define GDB_SIGPHONE 35 /* SIGPHONE */
56 #define GDB_SIGWAITING 36 /* Process's LWPs are blocked */
57 #define GDB_SIGLWP 37 /* Signal LWP */
58 #define GDB_SIGDANGER 38 /* Swap space dangerously low */
59 #define GDB_SIGGRANT 39 /* Monitor mode granted */
60 #define GDB_SIGRETRACT 40 /* Need to relinquish monitor mode */
61 #define GDB_SIGMSG 41 /* Monitor mode data available */
62 #define GDB_SIGSOUND 42 /* Sound completed */
63 #define GDB_SIGSAK 43 /* Secure attention */
64 #define GDB_SIGPRIO 44 /* SIGPRIO */
66 #define GDB_SIG33 45 /* Real-time event 33 */
67 #define GDB_SIG34 46 /* Real-time event 34 */
68 #define GDB_SIG35 47 /* Real-time event 35 */
69 #define GDB_SIG36 48 /* Real-time event 36 */
70 #define GDB_SIG37 49 /* Real-time event 37 */
71 #define GDB_SIG38 50 /* Real-time event 38 */
72 #define GDB_SIG39 51 /* Real-time event 39 */
73 #define GDB_SIG40 52 /* Real-time event 40 */
74 #define GDB_SIG41 53 /* Real-time event 41 */
75 #define GDB_SIG42 54 /* Real-time event 42 */
76 #define GDB_SIG43 55 /* Real-time event 43 */
77 #define GDB_SIG44 56 /* Real-time event 44 */
78 #define GDB_SIG45 57 /* Real-time event 45 */
79 #define GDB_SIG46 58 /* Real-time event 46 */
80 #define GDB_SIG47 59 /* Real-time event 47 */
81 #define GDB_SIG48 60 /* Real-time event 48 */
82 #define GDB_SIG49 61 /* Real-time event 49 */
83 #define GDB_SIG50 62 /* Real-time event 50 */
84 #define GDB_SIG51 63 /* Real-time event 51 */
85 #define GDB_SIG52 64 /* Real-time event 52 */
86 #define GDB_SIG53 65 /* Real-time event 53 */
87 #define GDB_SIG54 66 /* Real-time event 54 */
88 #define GDB_SIG55 67 /* Real-time event 55 */
89 #define GDB_SIG56 68 /* Real-time event 56 */
90 #define GDB_SIG57 69 /* Real-time event 57 */
91 #define GDB_SIG58 70 /* Real-time event 58 */
92 #define GDB_SIG59 71 /* Real-time event 59 */
93 #define GDB_SIG60 72 /* Real-time event 60 */
94 #define GDB_SIG61 73 /* Real-time event 61 */
95 #define GDB_SIG62 74 /* Real-time event 62 */
96 #define GDB_SIG63 75 /* Real-time event 63 */
97 #define GDB_SIGCANCEL 76 /* LWP internal signal */
98 #define GDB_SIG32 77 /* Real-time event 32 */
99 #define GDB_SIG64 78 /* Real-time event 64 */
100 #define GDB_SIG65 79 /* Real-time event 65 */
101 #define GDB_SIG66 80 /* Real-time event 66 */
102 #define GDB_SIG67 81 /* Real-time event 67 */
103 #define GDB_SIG68 82 /* Real-time event 68 */
104 #define GDB_SIG69 83 /* Real-time event 69 */
105 #define GDB_SIG70 84 /* Real-time event 70 */
106 #define GDB_SIG71 85 /* Real-time event 71 */
107 #define GDB_SIG72 86 /* Real-time event 72 */
108 #define GDB_SIG73 87 /* Real-time event 73 */
109 #define GDB_SIG74 88 /* Real-time event 74 */
110 #define GDB_SIG75 89 /* Real-time event 75 */
111 #define GDB_SIG76 90 /* Real-time event 76 */
112 #define GDB_SIG77 91 /* Real-time event 77 */
113 #define GDB_SIG78 92 /* Real-time event 78 */
114 #define GDB_SIG79 93 /* Real-time event 79 */
115 #define GDB_SIG80 94 /* Real-time event 80 */
116 #define GDB_SIG81 95 /* Real-time event 81 */
117 #define GDB_SIG82 96 /* Real-time event 82 */
118 #define GDB_SIG83 97 /* Real-time event 83 */
119 #define GDB_SIG84 98 /* Real-time event 84 */
120 #define GDB_SIG85 99 /* Real-time event 85 */
121 #define GDB_SIG86 100 /* Real-time event 86 */
122 #define GDB_SIG87 101 /* Real-time event 87 */
123 #define GDB_SIG88 102 /* Real-time event 88 */
124 #define GDB_SIG89 103 /* Real-time event 89 */
125 #define GDB_SIG90 104 /* Real-time event 90 */
126 #define GDB_SIG91 105 /* Real-time event 91 */
127 #define GDB_SIG92 106 /* Real-time event 92 */
128 #define GDB_SIG93 107 /* Real-time event 93 */
129 #define GDB_SIG94 108 /* Real-time event 94 */
130 #define GDB_SIG95 109 /* Real-time event 95 */
131 #define GDB_SIG96 110 /* Real-time event 96 */
132 #define GDB_SIG97 111 /* Real-time event 97 */
133 #define GDB_SIG98 112 /* Real-time event 98 */
134 #define GDB_SIG99 113 /* Real-time event 99 */
135 #define GDB_SIG100 114 /* Real-time event 100 */
136 #define GDB_SIG101 115 /* Real-time event 101 */
137 #define GDB_SIG102 116 /* Real-time event 102 */
138 #define GDB_SIG103 117 /* Real-time event 103 */
139 #define GDB_SIG104 118 /* Real-time event 104 */
140 #define GDB_SIG105 119 /* Real-time event 105 */
141 #define GDB_SIG106 120 /* Real-time event 106 */
142 #define GDB_SIG107 121 /* Real-time event 107 */
143 #define GDB_SIG108 122 /* Real-time event 108 */
144 #define GDB_SIG109 123 /* Real-time event 109 */
145 #define GDB_SIG110 124 /* Real-time event 110 */
146 #define GDB_SIG111 125 /* Real-time event 111 */
147 #define GDB_SIG112 126 /* Real-time event 112 */
148 #define GDB_SIG113 127 /* Real-time event 113 */
149 #define GDB_SIG114 128 /* Real-time event 114 */
150 #define GDB_SIG115 129 /* Real-time event 115 */
151 #define GDB_SIG116 130 /* Real-time event 116 */
152 #define GDB_SIG117 131 /* Real-time event 117 */
153 #define GDB_SIG118 132 /* Real-time event 118 */
154 #define GDB_SIG119 133 /* Real-time event 119 */
155 #define GDB_SIG120 134 /* Real-time event 120 */
156 #define GDB_SIG121 135 /* Real-time event 121 */
157 #define GDB_SIG122 136 /* Real-time event 122 */
158 #define GDB_SIG123 137 /* Real-time event 123 */
159 #define GDB_SIG124 138 /* Real-time event 124 */
160 #define GDB_SIG125 139 /* Real-time event 125 */
161 #define GDB_SIG126 140 /* Real-time event 126 */
162 #define GDB_SIG127 141 /* Real-time event 127 */
163 #define GDB_SIGINFO 142 /* Information request */
164 #define GDB_UNKNOWN 143 /* Unknown signal */
165 #define GDB_DEFAULT 144 /* error: default signal */
166 /* Mach exceptions */
167 #define GDB_EXC_BAD_ACCESS 145 /* Could not access memory */
168 #define GDB_EXC_BAD_INSTRCTION 146 /* Illegal instruction/operand */
169 #define GDB_EXC_ARITHMETIC 147 /* Arithmetic exception */
170 #define GDB_EXC_EMULATION 148 /* Emulation instruction */
171 #define GDB_EXC_SOFTWARE 149 /* Software generated exception */
172 #define GDB_EXC_BREAKPOINT 150 /* Breakpoint */
176 static unsigned char exception_to_signal[] =
178 [0] = GDB_SIGFPE, /* divide by zero */
179 [1] = GDB_SIGTRAP, /* debug exception */
180 [2] = GDB_SIGSEGV, /* NMI Interrupt */
181 [3] = GDB_SIGTRAP, /* Breakpoint */
182 [4] = GDB_SIGSEGV, /* into instruction (overflow) */
183 [5] = GDB_SIGSEGV, /* bound instruction */
184 [6] = GDB_SIGILL, /* Invalid opcode */
185 [7] = GDB_SIGSEGV, /* coprocessor not available */
186 [8] = GDB_SIGSEGV, /* double fault */
187 [9] = GDB_SIGFPE, /* coprocessor segment overrun */
188 [10] = GDB_SIGSEGV, /* Invalid TSS */
189 [11] = GDB_SIGBUS, /* Segment not present */
190 [12] = GDB_SIGBUS, /* stack exception */
191 [13] = GDB_SIGSEGV, /* general protection */
192 [14] = GDB_SIGSEGV, /* page fault */
193 [15] = GDB_UNKNOWN, /* reserved */
194 [16] = GDB_SIGEMT, /* coprocessor error */
195 [17] = GDB_SIGBUS, /* alignment check */
196 [18] = GDB_SIGSEGV, /* machine check */
197 [19] = GDB_SIGFPE, /* simd floating point exception */
210 [32] = GDB_SIGINT, /* User interrupt */
213 static const char hexchars[] = "0123456789abcdef";
214 static char in_buffer[BUFMAX];
215 static char out_buffer[BUFMAX];
218 static inline void stub_putc(int ch)
223 static inline int stub_getc(void)
225 return console_rx_byte();
228 static int hex(char ch)
230 if ((ch >= 'a') && (ch <= 'f'))
231 return (ch - 'a' + 10);
232 if ((ch >= '0') && (ch <= '9'))
234 if ((ch >= 'A') && (ch <= 'F'))
235 return (ch - 'A' + 10);
240 * While we find hexadecimal digits, build an int.
241 * Fals is returned if nothing is parsed true otherwise.
243 static int parse_ulong(char **ptr, unsigned long *value)
251 while((digit = hex(**ptr)) >= 0) {
252 *value = ((*value) << 4) | digit;
255 return start != *ptr;
258 /* convert the memory pointed to by mem into hex, placing result in buf */
259 /* return a pointer to the last char put in buf (null) */
260 static void copy_to_hex(char *buf, void *addr, unsigned long count)
267 *buf++ = hexchars[ch >> 4];
268 *buf++ = hexchars[ch & 0x0f];
275 /* convert the hex array pointed to by buf into binary to be placed in mem */
276 /* return a pointer to the character AFTER the last byte written */
277 static void copy_from_hex(void *addr, char *buf, unsigned long count)
283 ch = hex (*buf++) << 4;
284 ch = ch + hex (*buf++);
290 /* scan for the sequence $<data>#<checksum> */
292 static int get_packet(char *buffer)
294 unsigned char checksum;
295 unsigned char xmitcsum;
299 /* Wishlit implement a timeout in get_packet */
301 /* wait around for the start character, ignore all other characters */
302 while ((ch = (stub_getc() & 0x7f)) != '$');
308 /* now, read until a # or end of buffer is found */
309 while (count < BUFMAX) {
310 ch = stub_getc() & 0x7f;
313 checksum = checksum + ch;
320 xmitcsum = hex(stub_getc() & 0x7f) << 4;
321 xmitcsum += hex(stub_getc() & 0x7f);
323 if (checksum != xmitcsum) {
324 stub_putc('-'); /* failed checksum */
327 stub_putc('+'); /* successful transfer */
330 } while(checksum != xmitcsum);
334 /* send the packet in buffer.*/
335 static void put_packet(char *buffer)
337 unsigned char checksum;
341 /* $<packet info>#<checksum>. */
347 while ((ch = buffer[count])) {
354 stub_putc(hexchars[checksum >> 4]);
355 stub_putc(hexchars[checksum % 16]);
357 } while ((stub_getc() & 0x7f) != '+');
360 #endif /* CONFIG_GDB_STUB */
362 #include <arch/registers.h>
364 void x86_exception(struct eregs *info);
366 void x86_exception(struct eregs *info)
368 #if CONFIG_GDB_STUB == 1
370 memcpy(gdb_stub_registers, info, 8*sizeof(uint32_t));
371 gdb_stub_registers[PC] = info->eip;
372 gdb_stub_registers[CS] = info->cs;
373 gdb_stub_registers[PS] = info->eflags;
375 if (info->vector < ARRAY_SIZE(exception_to_signal)) {
376 signo = exception_to_signal[info->vector];
379 /* reply to the host that an exception has occured */
381 out_buffer[1] = hexchars[(signo>>4) & 0xf];
382 out_buffer[2] = hexchars[signo & 0xf];
383 out_buffer[3] = '\0';
384 put_packet(out_buffer);
387 unsigned long addr, length;
389 out_buffer[0] = '\0';
390 out_buffer[1] = '\0';
391 if (!get_packet(in_buffer)) {
394 switch(in_buffer[0]) {
395 case '?': /* last signal */
397 out_buffer[1] = hexchars[(signo >> 4) & 0xf];
398 out_buffer[2] = hexchars[signo & 0xf];
399 out_buffer[3] = '\0';
401 case 'g': /* return the value of the cpu registers */
402 copy_to_hex(out_buffer, &gdb_stub_registers, sizeof(gdb_stub_registers));
404 case 'G': /* set the value of the CPU registers - return OK */
405 copy_from_hex(&gdb_stub_registers, in_buffer + 1, sizeof(gdb_stub_registers));
406 memcpy(info, gdb_stub_registers, 8*sizeof(uint32_t));
407 info->eip = gdb_stub_registers[PC];
408 info->cs = gdb_stub_registers[CS];
409 info->eflags = gdb_stub_registers[PS];
410 memcpy(out_buffer, "OK",3);
413 /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
415 if ( parse_ulong(&ptr, &addr) &&
417 parse_ulong(&ptr, &length)) {
418 copy_to_hex(out_buffer, (void *)addr, length);
420 memcpy(out_buffer, "E01", 4);
424 /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */
426 if ( parse_ulong(&ptr, &addr) &&
428 parse_ulong(&ptr, &length) &&
430 copy_from_hex((void *)addr, ptr, length);
431 memcpy(out_buffer, "OK", 3);
434 memcpy(out_buffer, "E02", 4);
439 /* cAA..AA Continue at address AA..AA(optional) */
440 /* sAA..AA Step one instruction from AA..AA(optional) */
442 if (parse_ulong(&ptr, &addr)) {
446 /* Clear the trace bit */
447 info->eflags &= ~(1 << 8);
448 /* Set the trace bit if we are single stepping */
449 if (in_buffer[0] == 's') {
450 info->eflags |= (1 << 8);
455 memcpy(out_buffer, "OK", 3);
457 case 'k': /* kill request? */
459 case 'q': /* query */
461 case 'z': /* z0AAAA,LLLL remove memory breakpoint */
462 /* z1AAAA,LLLL remove hardware breakpoint */
463 /* z2AAAA,LLLL remove write watchpoint */
464 /* z3AAAA,LLLL remove read watchpoint */
465 /* z4AAAA,LLLL remove access watchpoint */
466 case 'Z': /* Z0AAAA,LLLL insert memory breakpoint */
467 /* Z1AAAA,LLLL insert hardware breakpoint */
468 /* Z2AAAA,LLLL insert write watchpoint */
469 /* Z3AAAA,LLLL insert read watchpoint */
470 /* Z4AAAA,LLLL insert access watchpoint */
475 put_packet(out_buffer);
477 #else /* !CONFIG_GDB_STUB */
479 "Unexpected Exception: %d @ %02x:%08x - Halting\n"
480 "Code: %d eflags: %08x\n"
481 "eax: %08x ebx: %08x ecx: %08x edx: %08x\n"
482 "edi: %08x esi: %08x ebp: %08x esp: %08x\n",
483 info->vector, info->cs, info->eip,
484 info->error_code, info->eflags,
485 info->eax, info->ebx, info->ecx, info->edx,
486 info->edi, info->esi, info->ebp, info->esp);