#include #include #include #if CONFIG_GDB_STUB /* BUFMAX defines the maximum number of characters in inbound/outbound buffers. * At least NUM_REGBYTES*2 are needed for register packets */ #define BUFMAX 400 enum regnames { EAX = 0, ECX, EDX, EBX, ESP, EBP, ESI, EDI, PC /* also known as eip */, PS /* also known as eflags */, CS, SS, DS, ES, FS, GS, NUM_REGS /* Number of registers. */ }; static uint32_t gdb_stub_registers[NUM_REGS]; #define GDB_SIG0 0 /* Signal 0 */ #define GDB_SIGHUP 1 /* Hangup */ #define GDB_SIGINT 2 /* Interrupt */ #define GDB_SIGQUIT 3 /* Quit */ #define GDB_SIGILL 4 /* Illegal instruction */ #define GDB_SIGTRAP 5 /* Trace/breakpoint trap */ #define GDB_SIGABRT 6 /* Aborted */ #define GDB_SIGEMT 7 /* Emulation trap */ #define GDB_SIGFPE 8 /* Arithmetic exception */ #define GDB_SIGKILL 9 /* Killed */ #define GDB_SIGBUS 10 /* Bus error */ #define GDB_SIGSEGV 11 /* Segmentation fault */ #define GDB_SIGSYS 12 /* Bad system call */ #define GDB_SIGPIPE 13 /* Broken pipe */ #define GDB_SIGALRM 14 /* Alarm clock */ #define GDB_SIGTERM 15 /* Terminated */ #define GDB_SIGURG 16 /* Urgent I/O condition */ #define GDB_SIGSTOP 17 /* Stopped (signal) */ #define GDB_SIGTSTP 18 /* Stopped (user) */ #define GDB_SIGCONT 19 /* Continued */ #define GDB_SIGCHLD 20 /* Child status changed */ #define GDB_SIGTTIN 21 /* Stopped (tty input) */ #define GDB_SIGTTOU 22 /* Stopped (tty output) */ #define GDB_SIGIO 23 /* I/O possible */ #define GDB_SIGXCPU 24 /* CPU time limit exceeded */ #define GDB_SIGXFSZ 25 /* File size limit exceeded */ #define GDB_SIGVTALRM 26 /* Virtual timer expired */ #define GDB_SIGPROF 27 /* Profiling timer expired */ #define GDB_SIGWINCH 28 /* Window size changed */ #define GDB_SIGLOST 29 /* Resource lost */ #define GDB_SIGUSR1 30 /* User defined signal 1 */ #define GDB_SUGUSR2 31 /* User defined signal 2 */ #define GDB_SIGPWR 32 /* Power fail/restart */ #define GDB_SIGPOLL 33 /* Pollable event occurred */ #define GDB_SIGWIND 34 /* SIGWIND */ #define GDB_SIGPHONE 35 /* SIGPHONE */ #define GDB_SIGWAITING 36 /* Process's LWPs are blocked */ #define GDB_SIGLWP 37 /* Signal LWP */ #define GDB_SIGDANGER 38 /* Swap space dangerously low */ #define GDB_SIGGRANT 39 /* Monitor mode granted */ #define GDB_SIGRETRACT 40 /* Need to relinquish monitor mode */ #define GDB_SIGMSG 41 /* Monitor mode data available */ #define GDB_SIGSOUND 42 /* Sound completed */ #define GDB_SIGSAK 43 /* Secure attention */ #define GDB_SIGPRIO 44 /* SIGPRIO */ #define GDB_SIG33 45 /* Real-time event 33 */ #define GDB_SIG34 46 /* Real-time event 34 */ #define GDB_SIG35 47 /* Real-time event 35 */ #define GDB_SIG36 48 /* Real-time event 36 */ #define GDB_SIG37 49 /* Real-time event 37 */ #define GDB_SIG38 50 /* Real-time event 38 */ #define GDB_SIG39 51 /* Real-time event 39 */ #define GDB_SIG40 52 /* Real-time event 40 */ #define GDB_SIG41 53 /* Real-time event 41 */ #define GDB_SIG42 54 /* Real-time event 42 */ #define GDB_SIG43 55 /* Real-time event 43 */ #define GDB_SIG44 56 /* Real-time event 44 */ #define GDB_SIG45 57 /* Real-time event 45 */ #define GDB_SIG46 58 /* Real-time event 46 */ #define GDB_SIG47 59 /* Real-time event 47 */ #define GDB_SIG48 60 /* Real-time event 48 */ #define GDB_SIG49 61 /* Real-time event 49 */ #define GDB_SIG50 62 /* Real-time event 50 */ #define GDB_SIG51 63 /* Real-time event 51 */ #define GDB_SIG52 64 /* Real-time event 52 */ #define GDB_SIG53 65 /* Real-time event 53 */ #define GDB_SIG54 66 /* Real-time event 54 */ #define GDB_SIG55 67 /* Real-time event 55 */ #define GDB_SIG56 68 /* Real-time event 56 */ #define GDB_SIG57 69 /* Real-time event 57 */ #define GDB_SIG58 70 /* Real-time event 58 */ #define GDB_SIG59 71 /* Real-time event 59 */ #define GDB_SIG60 72 /* Real-time event 60 */ #define GDB_SIG61 73 /* Real-time event 61 */ #define GDB_SIG62 74 /* Real-time event 62 */ #define GDB_SIG63 75 /* Real-time event 63 */ #define GDB_SIGCANCEL 76 /* LWP internal signal */ #define GDB_SIG32 77 /* Real-time event 32 */ #define GDB_SIG64 78 /* Real-time event 64 */ #define GDB_SIG65 79 /* Real-time event 65 */ #define GDB_SIG66 80 /* Real-time event 66 */ #define GDB_SIG67 81 /* Real-time event 67 */ #define GDB_SIG68 82 /* Real-time event 68 */ #define GDB_SIG69 83 /* Real-time event 69 */ #define GDB_SIG70 84 /* Real-time event 70 */ #define GDB_SIG71 85 /* Real-time event 71 */ #define GDB_SIG72 86 /* Real-time event 72 */ #define GDB_SIG73 87 /* Real-time event 73 */ #define GDB_SIG74 88 /* Real-time event 74 */ #define GDB_SIG75 89 /* Real-time event 75 */ #define GDB_SIG76 90 /* Real-time event 76 */ #define GDB_SIG77 91 /* Real-time event 77 */ #define GDB_SIG78 92 /* Real-time event 78 */ #define GDB_SIG79 93 /* Real-time event 79 */ #define GDB_SIG80 94 /* Real-time event 80 */ #define GDB_SIG81 95 /* Real-time event 81 */ #define GDB_SIG82 96 /* Real-time event 82 */ #define GDB_SIG83 97 /* Real-time event 83 */ #define GDB_SIG84 98 /* Real-time event 84 */ #define GDB_SIG85 99 /* Real-time event 85 */ #define GDB_SIG86 100 /* Real-time event 86 */ #define GDB_SIG87 101 /* Real-time event 87 */ #define GDB_SIG88 102 /* Real-time event 88 */ #define GDB_SIG89 103 /* Real-time event 89 */ #define GDB_SIG90 104 /* Real-time event 90 */ #define GDB_SIG91 105 /* Real-time event 91 */ #define GDB_SIG92 106 /* Real-time event 92 */ #define GDB_SIG93 107 /* Real-time event 93 */ #define GDB_SIG94 108 /* Real-time event 94 */ #define GDB_SIG95 109 /* Real-time event 95 */ #define GDB_SIG96 110 /* Real-time event 96 */ #define GDB_SIG97 111 /* Real-time event 97 */ #define GDB_SIG98 112 /* Real-time event 98 */ #define GDB_SIG99 113 /* Real-time event 99 */ #define GDB_SIG100 114 /* Real-time event 100 */ #define GDB_SIG101 115 /* Real-time event 101 */ #define GDB_SIG102 116 /* Real-time event 102 */ #define GDB_SIG103 117 /* Real-time event 103 */ #define GDB_SIG104 118 /* Real-time event 104 */ #define GDB_SIG105 119 /* Real-time event 105 */ #define GDB_SIG106 120 /* Real-time event 106 */ #define GDB_SIG107 121 /* Real-time event 107 */ #define GDB_SIG108 122 /* Real-time event 108 */ #define GDB_SIG109 123 /* Real-time event 109 */ #define GDB_SIG110 124 /* Real-time event 110 */ #define GDB_SIG111 125 /* Real-time event 111 */ #define GDB_SIG112 126 /* Real-time event 112 */ #define GDB_SIG113 127 /* Real-time event 113 */ #define GDB_SIG114 128 /* Real-time event 114 */ #define GDB_SIG115 129 /* Real-time event 115 */ #define GDB_SIG116 130 /* Real-time event 116 */ #define GDB_SIG117 131 /* Real-time event 117 */ #define GDB_SIG118 132 /* Real-time event 118 */ #define GDB_SIG119 133 /* Real-time event 119 */ #define GDB_SIG120 134 /* Real-time event 120 */ #define GDB_SIG121 135 /* Real-time event 121 */ #define GDB_SIG122 136 /* Real-time event 122 */ #define GDB_SIG123 137 /* Real-time event 123 */ #define GDB_SIG124 138 /* Real-time event 124 */ #define GDB_SIG125 139 /* Real-time event 125 */ #define GDB_SIG126 140 /* Real-time event 126 */ #define GDB_SIG127 141 /* Real-time event 127 */ #define GDB_SIGINFO 142 /* Information request */ #define GDB_UNKNOWN 143 /* Unknown signal */ #define GDB_DEFAULT 144 /* error: default signal */ /* Mach exceptions */ #define GDB_EXC_BAD_ACCESS 145 /* Could not access memory */ #define GDB_EXC_BAD_INSTRCTION 146 /* Illegal instruction/operand */ #define GDB_EXC_ARITHMETIC 147 /* Arithmetic exception */ #define GDB_EXC_EMULATION 148 /* Emulation instruction */ #define GDB_EXC_SOFTWARE 149 /* Software generated exception */ #define GDB_EXC_BREAKPOINT 150 /* Breakpoint */ static unsigned char exception_to_signal[] = { [0] = GDB_SIGFPE, /* divide by zero */ [1] = GDB_SIGTRAP, /* debug exception */ [2] = GDB_SIGSEGV, /* NMI Interrupt */ [3] = GDB_SIGTRAP, /* Breakpoint */ [4] = GDB_SIGSEGV, /* into instruction (overflow) */ [5] = GDB_SIGSEGV, /* bound instruction */ [6] = GDB_SIGILL, /* Invalid opcode */ [7] = GDB_SIGSEGV, /* coprocessor not available */ [8] = GDB_SIGSEGV, /* double fault */ [9] = GDB_SIGFPE, /* coprocessor segment overrun */ [10] = GDB_SIGSEGV, /* Invalid TSS */ [11] = GDB_SIGBUS, /* Segment not present */ [12] = GDB_SIGBUS, /* stack exception */ [13] = GDB_SIGSEGV, /* general protection */ [14] = GDB_SIGSEGV, /* page fault */ [15] = GDB_UNKNOWN, /* reserved */ [16] = GDB_SIGEMT, /* coprocessor error */ [17] = GDB_SIGBUS, /* alignment check */ [18] = GDB_SIGSEGV, /* machine check */ [19] = GDB_SIGFPE, /* simd floating point exception */ [20] = GDB_UNKNOWN, [21] = GDB_UNKNOWN, [22] = GDB_UNKNOWN, [23] = GDB_UNKNOWN, [24] = GDB_UNKNOWN, [25] = GDB_UNKNOWN, [26] = GDB_UNKNOWN, [27] = GDB_UNKNOWN, [28] = GDB_UNKNOWN, [29] = GDB_UNKNOWN, [30] = GDB_UNKNOWN, [31] = GDB_UNKNOWN, [32] = GDB_SIGINT, /* User interrupt */ }; static const char hexchars[] = "0123456789abcdef"; static char in_buffer[BUFMAX]; static char out_buffer[BUFMAX]; static inline void stub_putc(int ch) { gdb_tx_byte(ch); } static inline void stub_flush(void) { gdb_tx_flush(); } static inline int stub_getc(void) { return gdb_rx_byte(); } static int hex(char ch) { if ((ch >= 'a') && (ch <= 'f')) return (ch - 'a' + 10); if ((ch >= '0') && (ch <= '9')) return (ch - '0'); if ((ch >= 'A') && (ch <= 'F')) return (ch - 'A' + 10); return (-1); } /* * While we find hexadecimal digits, build an int. * Fals is returned if nothing is parsed true otherwise. */ static int parse_ulong(char **ptr, unsigned long *value) { int digit; char *start; start = *ptr; *value = 0; while((digit = hex(**ptr)) >= 0) { *value = ((*value) << 4) | digit; (*ptr)++; } return start != *ptr; } /* convert the memory pointed to by mem into hex, placing result in buf */ /* return a pointer to the last char put in buf (null) */ static void copy_to_hex(char *buf, void *addr, unsigned long count) { unsigned char ch; char *mem = addr; while(count--) { ch = *mem++; *buf++ = hexchars[ch >> 4]; *buf++ = hexchars[ch & 0x0f]; } *buf = 0; return; } /* convert the hex array pointed to by buf into binary to be placed in mem */ /* return a pointer to the character AFTER the last byte written */ static void copy_from_hex(void *addr, char *buf, unsigned long count) { unsigned char ch; char *mem = addr; while(count--) { ch = hex (*buf++) << 4; ch = ch + hex (*buf++); *mem++ = ch; } } /* scan for the sequence $# */ static int get_packet(char *buffer) { unsigned char checksum; unsigned char xmitcsum; int count; char ch; /* Wishlit implement a timeout in get_packet */ do { /* wait around for the start character, ignore all other characters */ while ((ch = (stub_getc() & 0x7f)) != '$'); checksum = 0; xmitcsum = -1; count = 0; /* now, read until a # or end of buffer is found */ while (count < BUFMAX) { ch = stub_getc() & 0x7f; if (ch == '#') break; checksum = checksum + ch; buffer[count] = ch; count = count + 1; } buffer[count] = 0; if (ch == '#') { xmitcsum = hex(stub_getc() & 0x7f) << 4; xmitcsum += hex(stub_getc() & 0x7f); if (checksum != xmitcsum) { stub_putc('-'); /* failed checksum */ stub_flush(); } else { stub_putc('+'); /* successful transfer */ stub_flush(); } } } while(checksum != xmitcsum); return 1; } /* send the packet in buffer.*/ static void put_packet(char *buffer) { unsigned char checksum; int count; char ch; /* $#. */ do { stub_putc('$'); checksum = 0; count = 0; while ((ch = buffer[count])) { stub_putc(ch); checksum += ch; count += 1; } stub_putc('#'); stub_putc(hexchars[checksum >> 4]); stub_putc(hexchars[checksum % 16]); stub_flush(); } while ((stub_getc() & 0x7f) != '+'); } #endif /* CONFIG_GDB_STUB */ #include void x86_exception(struct eregs *info); void x86_exception(struct eregs *info) { #if CONFIG_GDB_STUB int signo; memcpy(gdb_stub_registers, info, 8*sizeof(uint32_t)); gdb_stub_registers[PC] = info->eip; gdb_stub_registers[CS] = info->cs; gdb_stub_registers[PS] = info->eflags; signo = GDB_UNKNOWN; if (info->vector < ARRAY_SIZE(exception_to_signal)) { signo = exception_to_signal[info->vector]; } /* reply to the host that an exception has occured */ out_buffer[0] = 'S'; out_buffer[1] = hexchars[(signo>>4) & 0xf]; out_buffer[2] = hexchars[signo & 0xf]; out_buffer[3] = '\0'; put_packet(out_buffer); while(1) { unsigned long addr, length; char *ptr; out_buffer[0] = '\0'; out_buffer[1] = '\0'; if (!get_packet(in_buffer)) { break; } switch(in_buffer[0]) { case '?': /* last signal */ out_buffer[0] = 'S'; out_buffer[1] = hexchars[(signo >> 4) & 0xf]; out_buffer[2] = hexchars[signo & 0xf]; out_buffer[3] = '\0'; break; case 'g': /* return the value of the cpu registers */ copy_to_hex(out_buffer, &gdb_stub_registers, sizeof(gdb_stub_registers)); break; case 'G': /* set the value of the CPU registers - return OK */ copy_from_hex(&gdb_stub_registers, in_buffer + 1, sizeof(gdb_stub_registers)); memcpy(info, gdb_stub_registers, 8*sizeof(uint32_t)); info->eip = gdb_stub_registers[PC]; info->cs = gdb_stub_registers[CS]; info->eflags = gdb_stub_registers[PS]; memcpy(out_buffer, "OK",3); break; case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */ ptr = &in_buffer[1]; if ( parse_ulong(&ptr, &addr) && (*ptr++ == ',') && parse_ulong(&ptr, &length)) { copy_to_hex(out_buffer, (void *)addr, length); } else { memcpy(out_buffer, "E01", 4); } break; case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */ ptr = &in_buffer[1]; if ( parse_ulong(&ptr, &addr) && (*(ptr++) == ',') && parse_ulong(&ptr, &length) && (*(ptr++) == ':')) { copy_from_hex((void *)addr, ptr, length); memcpy(out_buffer, "OK", 3); } else { memcpy(out_buffer, "E02", 4); } break; case 's': case 'c': /* cAA..AA Continue at address AA..AA(optional) */ /* sAA..AA Step one instruction from AA..AA(optional) */ ptr = &in_buffer[1]; if (parse_ulong(&ptr, &addr)) { info->eip = addr; } /* Clear the trace bit */ info->eflags &= ~(1 << 8); /* Set the trace bit if we are single stepping */ if (in_buffer[0] == 's') { info->eflags |= (1 << 8); } return; break; case 'D': memcpy(out_buffer, "OK", 3); break; case 'k': /* kill request? */ break; case 'q': /* query */ break; case 'z': /* z0AAAA,LLLL remove memory breakpoint */ /* z1AAAA,LLLL remove hardware breakpoint */ /* z2AAAA,LLLL remove write watchpoint */ /* z3AAAA,LLLL remove read watchpoint */ /* z4AAAA,LLLL remove access watchpoint */ case 'Z': /* Z0AAAA,LLLL insert memory breakpoint */ /* Z1AAAA,LLLL insert hardware breakpoint */ /* Z2AAAA,LLLL insert write watchpoint */ /* Z3AAAA,LLLL insert read watchpoint */ /* Z4AAAA,LLLL insert access watchpoint */ break; default: break; } put_packet(out_buffer); } #else /* !CONFIG_GDB_STUB */ #define MDUMP_SIZE 0x80 printk(BIOS_EMERG, "Unexpected Exception: %d @ %02x:%08x - Halting\n" "Code: %d eflags: %08x\n" "eax: %08x ebx: %08x ecx: %08x edx: %08x\n" "edi: %08x esi: %08x ebp: %08x esp: %08x\n", info->vector, info->cs, info->eip, info->error_code, info->eflags, info->eax, info->ebx, info->ecx, info->edx, info->edi, info->esi, info->ebp, info->esp); u8 *code = (u8*)((uintptr_t)info->eip - (MDUMP_SIZE >>1)); /* Align to 8-byte boundary please, and print eight bytes per row. * This is done to make DRAM burst timing/reordering errors more * evident from the looking at the dump */ code = (u8*)((uintptr_t)code & ~0x7); int i; for(i = 0; i < MDUMP_SIZE; i++) { if( (i & 0x07) == 0 ) printk(BIOS_EMERG, "\n%p:\t", code + i); printk(BIOS_EMERG, "%.2x ", code[i]); } die(""); #endif }