| /* |
| * Kernel Debugger Architecture Independent Console I/O handler |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (c) 1999-2006 Silicon Graphics, Inc. All Rights Reserved. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/ctype.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/kdev_t.h> |
| #include <linux/console.h> |
| #include <linux/string.h> |
| #include <linux/sched.h> |
| #include <linux/smp.h> |
| #include <linux/nmi.h> |
| #include <linux/delay.h> |
| |
| #include <linux/lkdb.h> |
| #include <linux/kdbprivate.h> |
| #include <linux/kallsyms.h> |
| |
| static struct console *kdbcons; |
| |
| #ifdef CONFIG_PPC64 |
| #include <asm/udbg.h> |
| #endif |
| |
| #define CMD_BUFLEN 256 |
| char lkdb_prompt_str[CMD_BUFLEN]; |
| #ifndef CONFIG_KGDB |
| /* this resides in kernel/debug/kdb/kdb_io.c for KGDB */ |
| int kdb_trap_printk; |
| #endif |
| |
| extern int lkdb_grepping_flag; |
| extern char lkdb_grep_string[]; |
| extern int lkdb_grep_leading; |
| extern int lkdb_grep_trailing; |
| |
| /* |
| * kdb_read |
| * |
| * This function reads a string of characters, terminated by |
| * a newline, or by reaching the end of the supplied buffer, |
| * from the current kernel debugger console device. |
| * Parameters: |
| * buffer - Address of character buffer to receive input characters. |
| * bufsize - size, in bytes, of the character buffer |
| * Returns: |
| * Returns a pointer to the buffer containing the received |
| * character string. This string will be terminated by a |
| * newline character. |
| * Locking: |
| * No locks are required to be held upon entry to this |
| * function. It is not reentrant - it relies on the fact |
| * that while kdb is running on any one processor all other |
| * processors will be spinning at the kdb barrier. |
| * Remarks: |
| * |
| * Davidm asks, why doesn't kdb use the console abstraction; |
| * here are some reasons: |
| * - you cannot debug the console abstraction with kdb if |
| * kdb uses it. |
| * - you rely on the correct functioning of the abstraction |
| * in the presence of general system failures. |
| * - You must acquire the console spinlock thus restricting |
| * the usability - what if the kernel fails with the spinlock |
| * held - one still wishes to debug such situations. |
| * - How about debugging before the console(s) are registered? |
| * - None of the current consoles (sercons, vt_console_driver) |
| * have read functions defined. |
| * - The standard pc keyboard and terminal drivers are interrupt |
| * driven. We cannot enable interrupts while kdb is active, |
| * so the standard input functions cannot be used by kdb. |
| * |
| * An implementation could be improved by removing the need for |
| * lock acquisition - just keep a 'struct console *kdbconsole;' global |
| * variable which refers to the preferred kdb console. |
| * |
| * The bulk of this function is architecture dependent. |
| * |
| * The buffer size must be >= 2. A buffer size of 2 means that the caller only |
| * wants a single key. |
| * |
| * An escape key could be the start of a vt100 control sequence such as \e[D |
| * (left arrow) or it could be a character in its own right. The standard |
| * method for detecting the difference is to wait for 2 seconds to see if there |
| * are any other characters. kdb is complicated by the lack of a timer service |
| * (interrupts are off), by multiple input sources and by the need to sometimes |
| * return after just one key. Escape sequence processing has to be done as |
| * states in the polling loop. |
| */ |
| |
| char * |
| kdb_read(char *buffer, size_t bufsize) |
| { |
| char *cp = buffer; |
| char *bufend = buffer+bufsize-2; /* Reserve space for newline and null byte */ |
| |
| char *lastchar; |
| char *p_tmp; |
| char tmp; |
| static char tmpbuffer[CMD_BUFLEN]; |
| int len = strlen(buffer); |
| int len_tmp; |
| int tab=0; |
| int count; |
| int i; |
| int diag, dtab_count; |
| |
| #define ESCAPE_UDELAY 1000 |
| #define ESCAPE_DELAY 2*1000000/ESCAPE_UDELAY /* 2 seconds worth of udelays */ |
| char escape_data[5]; /* longest vt100 escape sequence is 4 bytes */ |
| char *ped = escape_data; |
| int escape_delay = 0; |
| lget_char_func *f, *f_escape = NULL; |
| |
| diag = lkdbgetintenv("DTABCOUNT",&dtab_count); |
| if (diag) |
| dtab_count = 30; |
| |
| if (len > 0 ) { |
| cp += len; |
| if (*(buffer+len-1) == '\n') |
| cp--; |
| } |
| |
| lastchar = cp; |
| *cp = '\0'; |
| lkdb_printf("%s", buffer); |
| |
| for (;;) { |
| int key; |
| for (f = &poll_funcs[0]; ; ++f) { |
| if (*f == NULL) { |
| /* Reset NMI watchdog once per poll loop */ |
| touch_nmi_watchdog(); |
| f = &poll_funcs[0]; |
| } |
| if (escape_delay == 2) { |
| *ped = '\0'; |
| ped = escape_data; |
| --escape_delay; |
| } |
| if (escape_delay == 1) { |
| key = *ped++; |
| if (!*ped) |
| --escape_delay; |
| break; |
| } |
| key = (*f)(); |
| if (key == -1) { |
| if (escape_delay) { |
| udelay(ESCAPE_UDELAY); |
| --escape_delay; |
| } |
| continue; |
| } |
| if (bufsize <= 2) { |
| if (key == '\r') |
| key = '\n'; |
| lkdb_printf("%c", key); |
| *buffer++ = key; |
| *buffer = '\0'; |
| return buffer; |
| } |
| if (escape_delay == 0 && key == '\e') { |
| escape_delay = ESCAPE_DELAY; |
| ped = escape_data; |
| f_escape = f; |
| } |
| if (escape_delay) { |
| *ped++ = key; |
| if (f_escape != f) { |
| escape_delay = 2; |
| continue; |
| } |
| if (ped - escape_data == 1) { |
| /* \e */ |
| continue; |
| } |
| else if (ped - escape_data == 2) { |
| /* \e<something> */ |
| if (key != '[') |
| escape_delay = 2; |
| continue; |
| } else if (ped - escape_data == 3) { |
| /* \e[<something> */ |
| int mapkey = 0; |
| switch (key) { |
| case 'A': mapkey = 16; break; /* \e[A, up arrow */ |
| case 'B': mapkey = 14; break; /* \e[B, down arrow */ |
| case 'C': mapkey = 6; break; /* \e[C, right arrow */ |
| case 'D': mapkey = 2; break; /* \e[D, left arrow */ |
| case '1': /* dropthrough */ |
| case '3': /* dropthrough */ |
| case '4': mapkey = -1; break; /* \e[<1,3,4>], may be home, del, end */ |
| } |
| if (mapkey != -1) { |
| if (mapkey > 0) { |
| escape_data[0] = mapkey; |
| escape_data[1] = '\0'; |
| } |
| escape_delay = 2; |
| } |
| continue; |
| } else if (ped - escape_data == 4) { |
| /* \e[<1,3,4><something> */ |
| int mapkey = 0; |
| if (key == '~') { |
| switch (escape_data[2]) { |
| case '1': mapkey = 1; break; /* \e[1~, home */ |
| case '3': mapkey = 4; break; /* \e[3~, del */ |
| case '4': mapkey = 5; break; /* \e[4~, end */ |
| } |
| } |
| if (mapkey > 0) { |
| escape_data[0] = mapkey; |
| escape_data[1] = '\0'; |
| } |
| escape_delay = 2; |
| continue; |
| } |
| } |
| break; /* A key to process */ |
| } |
| |
| if (key != 9) |
| tab = 0; |
| switch (key) { |
| case 8: /* backspace */ |
| if (cp > buffer) { |
| if (cp < lastchar) { |
| memcpy(tmpbuffer, cp, lastchar - cp); |
| memcpy(cp-1, tmpbuffer, lastchar - cp); |
| } |
| *(--lastchar) = '\0'; |
| --cp; |
| lkdb_printf("\b%s \r", cp); |
| tmp = *cp; |
| *cp = '\0'; |
| lkdb_printf(lkdb_prompt_str); |
| lkdb_printf("%s", buffer); |
| *cp = tmp; |
| } |
| break; |
| case 13: /* enter \r */ |
| case 10: /* enter \n */ |
| *lastchar++ = '\n'; |
| *lastchar++ = '\0'; |
| lkdb_printf("\n"); |
| return buffer; |
| case 4: /* Del */ |
| if(cp < lastchar) { |
| memcpy(tmpbuffer, cp+1, lastchar - cp -1); |
| memcpy(cp, tmpbuffer, lastchar - cp -1); |
| *(--lastchar) = '\0'; |
| lkdb_printf("%s \r", cp); |
| tmp = *cp; |
| *cp = '\0'; |
| lkdb_printf(lkdb_prompt_str); |
| lkdb_printf("%s", buffer); |
| *cp = tmp; |
| } |
| break; |
| case 1: /* Home */ |
| if(cp > buffer) { |
| lkdb_printf("\r"); |
| lkdb_printf(lkdb_prompt_str); |
| cp = buffer; |
| } |
| break; |
| case 5: /* End */ |
| if(cp < lastchar) { |
| lkdb_printf("%s", cp); |
| cp = lastchar; |
| } |
| break; |
| case 2: /* Left */ |
| if (cp > buffer) { |
| lkdb_printf("\b"); |
| --cp; |
| } |
| break; |
| case 14: /* Down */ |
| memset(tmpbuffer, ' ', strlen(lkdb_prompt_str)+(lastchar-buffer)); |
| *(tmpbuffer+strlen(lkdb_prompt_str)+(lastchar-buffer)) = '\0'; |
| lkdb_printf("\r%s\r", tmpbuffer); |
| *lastchar = (char)key; |
| *(lastchar+1) = '\0'; |
| return lastchar; |
| case 6: /* Right */ |
| if (cp < lastchar) { |
| lkdb_printf("%c", *cp); |
| ++cp; |
| } |
| break; |
| case 16: /* Up */ |
| memset(tmpbuffer, ' ', strlen(lkdb_prompt_str)+(lastchar-buffer)); |
| *(tmpbuffer+strlen(lkdb_prompt_str)+(lastchar-buffer)) = '\0'; |
| lkdb_printf("\r%s\r", tmpbuffer); |
| *lastchar = (char)key; |
| *(lastchar+1) = '\0'; |
| return lastchar; |
| case 9: /* Tab */ |
| if (tab < 2) |
| ++tab; |
| p_tmp = buffer; |
| while(*p_tmp==' ') p_tmp++; |
| if (p_tmp<=cp) { |
| memcpy(tmpbuffer, p_tmp, cp-p_tmp); |
| *(tmpbuffer + (cp-p_tmp)) = '\0'; |
| p_tmp = strrchr(tmpbuffer, ' '); |
| if (p_tmp) |
| ++p_tmp; |
| else |
| p_tmp = tmpbuffer; |
| len = strlen(p_tmp); |
| count = lkallsyms_symbol_complete(p_tmp, sizeof(tmpbuffer) - (p_tmp - tmpbuffer)); |
| if (tab == 2) { |
| if (count > 0) { |
| lkdb_printf("\n%d symbols are found.", count); |
| if(count>dtab_count) { |
| count=dtab_count; |
| lkdb_printf(" But only first %d symbols will be printed.\nYou can change the environment variable DTABCOUNT.", count); |
| } |
| lkdb_printf("\n"); |
| for(i=0;i<count;i++) { |
| if(lkallsyms_symbol_next(p_tmp, i)<0) |
| break; |
| lkdb_printf("%s ",p_tmp); |
| *(p_tmp+len)='\0'; |
| } |
| if(i>=dtab_count)lkdb_printf("..."); |
| lkdb_printf("\n"); |
| lkdb_printf(lkdb_prompt_str); |
| lkdb_printf("%s", buffer); |
| } |
| } |
| else { |
| if (count > 0) { |
| len_tmp = strlen(p_tmp); |
| strncpy(p_tmp+len_tmp,cp, lastchar-cp+1); |
| len_tmp = strlen(p_tmp); |
| strncpy(cp, p_tmp+len, len_tmp-len+1); |
| len = len_tmp - len; |
| lkdb_printf("%s", cp); |
| cp+=len; |
| lastchar+=len; |
| } |
| } |
| lkdb_nextline = 1; /* reset output line number */ |
| } |
| break; |
| default: |
| if (key >= 32 &&lastchar < bufend) { |
| if (cp < lastchar) { |
| memcpy(tmpbuffer, cp, lastchar - cp); |
| memcpy(cp+1, tmpbuffer, lastchar - cp); |
| *++lastchar = '\0'; |
| *cp = key; |
| lkdb_printf("%s\r", cp); |
| ++cp; |
| tmp = *cp; |
| *cp = '\0'; |
| lkdb_printf(lkdb_prompt_str); |
| lkdb_printf("%s", buffer); |
| *cp = tmp; |
| } else { |
| *++lastchar = '\0'; |
| *cp++ = key; |
| lkdb_printf("%c", key); |
| } |
| } |
| break; |
| } |
| } |
| } |
| |
| /* |
| * lkdb_getstr |
| * |
| * Print the prompt string and read a command from the |
| * input device. |
| * |
| * Parameters: |
| * buffer Address of buffer to receive command |
| * bufsize Size of buffer in bytes |
| * prompt Pointer to string to use as prompt string |
| * Returns: |
| * Pointer to command buffer. |
| * Locking: |
| * None. |
| * Remarks: |
| * For SMP kernels, the processor number will be |
| * substituted for %d, %x or %o in the prompt. |
| */ |
| |
| char * |
| lkdb_getstr(char *buffer, size_t bufsize, char *prompt) |
| { |
| if(prompt && lkdb_prompt_str!=prompt) |
| strncpy(lkdb_prompt_str, prompt, CMD_BUFLEN); |
| lkdb_printf(lkdb_prompt_str); |
| lkdb_nextline = 1; /* Prompt and input resets line number */ |
| return kdb_read(buffer, bufsize); |
| } |
| |
| /* |
| * kdb_input_flush |
| * |
| * Get rid of any buffered console input. |
| * |
| * Parameters: |
| * none |
| * Returns: |
| * nothing |
| * Locking: |
| * none |
| * Remarks: |
| * Call this function whenever you want to flush input. If there is any |
| * outstanding input, it ignores all characters until there has been no |
| * data for approximately half a second. |
| */ |
| |
| #define FLUSH_UDELAY 100 |
| #define FLUSH_DELAY 500000/FLUSH_UDELAY /* 0.5 seconds worth of udelays */ |
| |
| static void |
| kdb_input_flush(void) |
| { |
| lget_char_func *f; |
| int flush_delay = 1; |
| while (flush_delay--) { |
| touch_nmi_watchdog(); |
| for (f = &poll_funcs[0]; *f; ++f) { |
| if ((*f)() != -1) { |
| flush_delay = FLUSH_DELAY; |
| break; |
| } |
| } |
| if (flush_delay) |
| udelay(FLUSH_UDELAY); |
| } |
| } |
| |
| /* |
| * lkdb_printf |
| * |
| * Print a string to the output device(s). |
| * |
| * Parameters: |
| * printf-like format and optional args. |
| * Returns: |
| * 0 |
| * Locking: |
| * None. |
| * Remarks: |
| * use 'kdbcons->write()' to avoid polluting 'log_buf' with |
| * kdb output. |
| * |
| * If the user is doing a cmd args | grep srch |
| * then lkdb_grepping_flag is set. |
| * In that case we need to accumulate full lines (ending in \n) before |
| * searching for the pattern. |
| */ |
| |
| static char kdb_buffer[256]; /* A bit too big to go on stack */ |
| static char *next_avail=kdb_buffer; |
| static int size_avail; |
| static int suspend_grep=0; |
| |
| /* |
| * search arg1 to see if it contains arg2 |
| * (kdmain.c provides flags for ^pat and pat$) |
| * |
| * return 1 for found, 0 for not found |
| */ |
| int |
| kdb_search_string(char *searched, char *searchfor) |
| { |
| char firstchar, *cp; |
| int len1, len2; |
| |
| /* not counting the newline at the end of "searched" */ |
| len1 = strlen(searched)-1; |
| len2 = strlen(searchfor); |
| if (len1 < len2) return 0; |
| if (lkdb_grep_leading && lkdb_grep_trailing && len1 != len2) return 0; |
| |
| if (lkdb_grep_leading) { |
| if (!strncmp(searched, searchfor, len2)) { |
| return 1; |
| } |
| } else if (lkdb_grep_trailing) { |
| if (!strncmp(searched+len1-len2, searchfor, len2)) { |
| return 1; |
| } |
| } else { |
| firstchar = *searchfor; |
| cp = searched; |
| while ((cp = strchr(cp,firstchar))) { |
| if (!strncmp(cp, searchfor, len2)) { |
| return 1; |
| } |
| cp++; |
| } |
| } |
| return 0; |
| } |
| |
| void |
| lkdb_printf(const char *fmt, ...) |
| { |
| va_list ap; |
| int diag; |
| int linecount; |
| int logging, saved_loglevel = 0; |
| int do_longjmp = 0; |
| int got_printf_lock = 0; |
| int fnd, len; |
| char *cp, *cp2, *cphold = NULL, replaced_byte = ' '; |
| char *moreprompt = "more> "; |
| struct console *c = console_drivers; |
| static DEFINE_SPINLOCK(lkdb_printf_lock); |
| unsigned long uninitialized_var(flags); |
| |
| preempt_disable(); |
| /* Serialize lkdb_printf if multiple cpus try to write at once. |
| * But if any cpu goes recursive in kdb, just print the output, |
| * even if it is interleaved with any other text. |
| */ |
| if (!KDB_STATE(PRINTF_LOCK)) { |
| KDB_STATE_SET(PRINTF_LOCK); |
| spin_lock_irqsave(&lkdb_printf_lock, flags); |
| got_printf_lock = 1; |
| atomic_inc(&lkdb_event); |
| } else { |
| __acquire(lkdb_printf_lock); |
| } |
| atomic_inc(&kdb_8250); |
| |
| diag = lkdbgetintenv("LINES", &linecount); |
| if (diag || linecount <= 1) |
| linecount = 22; |
| |
| diag = lkdbgetintenv("LOGGING", &logging); |
| if (diag) |
| logging = 0; |
| |
| if (!lkdb_grepping_flag || suspend_grep) { |
| /* normally, every vsnprintf starts a new buffer */ |
| next_avail = kdb_buffer; |
| size_avail = sizeof(kdb_buffer); |
| } |
| va_start(ap, fmt); |
| vsnprintf(next_avail, size_avail, fmt, ap); |
| va_end(ap); |
| |
| /* |
| * If lkdb_parse() found that the command was cmd xxx | grep yyy |
| * then lkdb_grepping_flag is set, and lkdb_grep_string contains yyy |
| * |
| * Accumulate the print data up to a newline before searching it. |
| * (vsnprintf does null-terminate the string that it generates) |
| */ |
| |
| /* skip the search if prints are temporarily unconditional */ |
| if (! suspend_grep) { |
| |
| if (lkdb_grepping_flag) { |
| cp = strchr(kdb_buffer, '\n'); |
| if (!cp) { |
| /* |
| * Special cases that don't end with newlines |
| * but should be written without one: |
| * The "[nn]kdb> " prompt should |
| * appear at the front of the buffer. |
| * |
| * The "[nn]more " prompt should also be |
| * (MOREPROMPT -> moreprompt) |
| * written * but we print that ourselves, |
| * we set the suspend_grep flag to make |
| * it unconditional. |
| * |
| */ |
| if (next_avail == kdb_buffer) { |
| /* |
| * these should occur after a newline, |
| * so they will be at the front of |
| * the buffer |
| */ |
| cp2 = kdb_buffer; |
| len = strlen(lkdb_prompt_str); |
| if (!strncmp(cp2,lkdb_prompt_str, len)) { |
| /* |
| * We're about to start a new |
| * command, so we can go back |
| * to normal mode. |
| */ |
| lkdb_grepping_flag = 0; |
| goto kdb_printit; |
| } |
| } |
| /* no newline; don't search/write the buffer |
| until one is there */ |
| len = strlen(kdb_buffer); |
| next_avail = kdb_buffer + len; |
| size_avail = sizeof(kdb_buffer) - len; |
| goto kdb_print_out; |
| } |
| |
| /* |
| * The newline is present; print through it or discard |
| * it, depending on the results of the search. |
| */ |
| cp++; /* to byte after the newline */ |
| replaced_byte = *cp; /* remember what/where it was */ |
| cphold = cp; |
| *cp = '\0'; /* end the string for our search */ |
| |
| /* |
| * We now have a newline at the end of the string |
| * Only continue with this output if it contains the |
| * search string. |
| */ |
| fnd = kdb_search_string(kdb_buffer, lkdb_grep_string); |
| if (!fnd) { |
| /* |
| * At this point the complete line at the start |
| * of kdb_buffer can be discarded, as it does |
| * not contain what the user is looking for. |
| * Shift the buffer left. |
| */ |
| *cphold = replaced_byte; |
| strcpy(kdb_buffer, cphold); |
| len = strlen(kdb_buffer); |
| next_avail = kdb_buffer + len; |
| size_avail = sizeof(kdb_buffer) - len; |
| goto kdb_print_out; |
| } |
| /* |
| * at this point the string is a full line and |
| * should be printed, up to the null. |
| */ |
| } |
| } |
| kdb_printit: |
| |
| /* |
| * Write to all consoles. |
| */ |
| #ifdef CONFIG_SPARC64 |
| if (c == NULL) |
| prom_printf("%s", kdb_buffer); |
| else |
| #endif |
| |
| #ifdef CONFIG_PPC64 |
| if (udbg_write) |
| udbg_write(kdb_buffer, strlen(kdb_buffer)); |
| else |
| #endif |
| |
| while (c) { |
| c->write(c, kdb_buffer, strlen(kdb_buffer)); |
| touch_nmi_watchdog(); |
| c = c->next; |
| } |
| if (logging) { |
| saved_loglevel = console_loglevel; |
| console_loglevel = 0; |
| printk("%s", kdb_buffer); |
| } |
| |
| if (KDB_STATE(LONGJMP) && strchr(kdb_buffer, '\n')) |
| lkdb_nextline++; |
| |
| /* check for having reached the LINES number of printed lines */ |
| if (lkdb_nextline == linecount) { |
| char buf1[16]=""; |
| #if defined(CONFIG_SMP) |
| char buf2[32]; |
| #endif |
| |
| /* Watch out for recursion here. Any routine that calls |
| * lkdb_printf will come back through here. And kdb_read |
| * uses lkdb_printf to echo on serial consoles ... |
| */ |
| lkdb_nextline = 1; /* In case of recursion */ |
| |
| /* |
| * Pause until cr. |
| */ |
| moreprompt = lkdbgetenv("MOREPROMPT"); |
| if (moreprompt == NULL) { |
| moreprompt = "more> "; |
| } |
| |
| #if defined(CONFIG_SMP) |
| if (strchr(moreprompt, '%')) { |
| sprintf(buf2, moreprompt, get_cpu()); |
| put_cpu(); |
| moreprompt = buf2; |
| } |
| #endif |
| |
| kdb_input_flush(); |
| c = console_drivers; |
| #ifdef CONFIG_SPARC64 |
| if (c == NULL) |
| prom_printf("%s", moreprompt); |
| else |
| #endif |
| |
| #ifdef CONFIG_PPC64 |
| if (udbg_write) |
| udbg_write(moreprompt, strlen(moreprompt)); |
| else |
| #endif |
| |
| while (c) { |
| c->write(c, moreprompt, strlen(moreprompt)); |
| touch_nmi_watchdog(); |
| c = c->next; |
| } |
| |
| if (logging) |
| printk("%s", moreprompt); |
| |
| kdb_read(buf1, 2); /* '2' indicates to return immediately after getting one key. */ |
| lkdb_nextline = 1; /* Really set output line 1 */ |
| |
| /* empty and reset the buffer: */ |
| kdb_buffer[0] = '\0'; |
| next_avail = kdb_buffer; |
| size_avail = sizeof(kdb_buffer); |
| if ((buf1[0] == 'q') || (buf1[0] == 'Q')) { |
| /* user hit q or Q */ |
| do_longjmp = 1; |
| LKDB_FLAG_SET(CMD_INTERRUPT); /* command was interrupted */ |
| /* end of command output; back to normal mode */ |
| lkdb_grepping_flag = 0; |
| lkdb_printf("\n"); |
| } else if (buf1[0] && buf1[0] != '\n') { |
| /* user hit something other than enter */ |
| suspend_grep = 1; /* for this recursion */ |
| lkdb_printf("\nOnly 'q' or 'Q' are processed at more prompt, input ignored\n"); |
| } else if (lkdb_grepping_flag) { |
| /* user hit enter */ |
| suspend_grep = 1; /* for this recursion */ |
| lkdb_printf("\n"); |
| } |
| kdb_input_flush(); |
| } |
| |
| /* |
| * For grep searches, shift the printed string left. |
| * replaced_byte contains the character that was overwritten with |
| * the terminating null, and cphold points to the null. |
| * Then adjust the notion of available space in the buffer. |
| */ |
| if (lkdb_grepping_flag && !suspend_grep) { |
| *cphold = replaced_byte; |
| strcpy(kdb_buffer, cphold); |
| len = strlen(kdb_buffer); |
| next_avail = kdb_buffer + len; |
| size_avail = sizeof(kdb_buffer) - len; |
| } |
| |
| kdb_print_out: |
| suspend_grep = 0; /* end of what may have been a recursive call */ |
| if (logging) { |
| console_loglevel = saved_loglevel; |
| } |
| atomic_dec(&kdb_8250); |
| if (KDB_STATE(PRINTF_LOCK) && got_printf_lock) { |
| got_printf_lock = 0; |
| spin_unlock_irqrestore(&lkdb_printf_lock, flags); |
| KDB_STATE_CLEAR(PRINTF_LOCK); |
| atomic_dec(&lkdb_event); |
| } else { |
| __release(lkdb_printf_lock); |
| } |
| preempt_enable(); |
| if (do_longjmp) |
| #ifdef kdba_setjmp |
| kdba_longjmp(&kdbjmpbuf[smp_processor_id()], 1) |
| #endif /* kdba_setjmp */ |
| ; |
| } |
| |
| /* |
| * lkdb_io_init |
| * |
| * Initialize kernel debugger output environment. |
| * |
| * Parameters: |
| * None. |
| * Returns: |
| * None. |
| * Locking: |
| * None. |
| * Remarks: |
| * Select a console device. Only use a VT console if the user specified |
| * or defaulted console= /^tty[0-9]*$/ |
| */ |
| |
| void __init |
| lkdb_io_init(void) |
| { |
| /* |
| * Select a console. |
| */ |
| struct console *c = console_drivers; |
| int vt_console = 0; |
| |
| while (c) { |
| if ((c->flags & CON_CONSDEV) && !kdbcons) |
| kdbcons = c; |
| if ((c->flags & CON_ENABLED) && |
| strncmp(c->name, "tty", 3) == 0) { |
| char *p = c->name + 3; |
| while (isdigit(*p)) |
| ++p; |
| if (*p == '\0') |
| vt_console = 1; |
| } |
| c = c->next; |
| } |
| |
| if (kdbcons == NULL) { |
| printk(KERN_ERR "kdb: Initialization failed - no console. kdb is disabled.\n"); |
| LKDB_FLAG_SET(NO_CONSOLE); |
| kdb_on = 0; |
| } |
| if (!vt_console) |
| LKDB_FLAG_SET(NO_VT_CONSOLE); |
| kdb_input_flush(); |
| return; |
| } |
| |
| EXPORT_SYMBOL(kdb_read); |