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cos / mirrors / cros / chromiumos / third_party / coreboot / 796af17f18554380a49d69d7768ac18ee039d711 / . / src / arch / x86 / lib / exception.c
blob: 97569493fd52a72c9c1880cded12918615913343 [file] [log] [blame]
#include <console/console.h>
#include <string.h>
#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)
{
console_tx_byte(ch);
}
static inline int stub_getc(void)
{
return console_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 $<data>#<checksum> */
static int get_packet(char *buffer)
{
unsigned char checksum;
unsigned char xmitcsum;
int count;
char ch;
/* Wishlit implement a timeout in get_packet */
do {
/* wait around for the start character, ignore all other characters */
while ((ch = (stub_getc() & 0x7f)) != '$');
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 */
}
else {
stub_putc('+'); /* successful transfer */
}
}
} while(checksum != xmitcsum);
return 1;
}
/* send the packet in buffer.*/
static void put_packet(char *buffer)
{
unsigned char checksum;
int count;
char ch;
/* $<packet info>#<checksum>. */
do {
stub_putc('$');
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]);
} while ((stub_getc() & 0x7f) != '+');
}
#endif /* CONFIG_GDB_STUB */
#include <arch/registers.h>
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*)((u32)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*)((u32)code & ~0x7);
int i;
for(i = 0; i < MDUMP_SIZE; i++)
{
if( (i & 0x07) == 0 )
printk(BIOS_EMERG, "\n%.8x:\t", (int)code + i );
printk(BIOS_EMERG, "%.2x ", code[i]);
}
die("");
#endif
}