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870 lines
21 KiB
870 lines
21 KiB
/* |
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* Kernel Debugger Architecture Independent Console I/O handler |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (c) 1999-2006 Silicon Graphics, Inc. All Rights Reserved. |
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* Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved. |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/ctype.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/kdev_t.h> |
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#include <linux/console.h> |
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#include <linux/string.h> |
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#include <linux/sched.h> |
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#include <linux/smp.h> |
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#include <linux/nmi.h> |
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#include <linux/delay.h> |
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#include <linux/kgdb.h> |
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#include <linux/kdb.h> |
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#include <linux/kallsyms.h> |
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#include "kdb_private.h" |
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|
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#define CMD_BUFLEN 256 |
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char kdb_prompt_str[CMD_BUFLEN]; |
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|
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int kdb_trap_printk; |
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int kdb_printf_cpu = -1; |
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|
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static int kgdb_transition_check(char *buffer) |
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{ |
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if (buffer[0] != '+' && buffer[0] != '$') { |
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KDB_STATE_SET(KGDB_TRANS); |
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kdb_printf("%s", buffer); |
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} else { |
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int slen = strlen(buffer); |
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if (slen > 3 && buffer[slen - 3] == '#') { |
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kdb_gdb_state_pass(buffer); |
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strcpy(buffer, "kgdb"); |
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KDB_STATE_SET(DOING_KGDB); |
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return 1; |
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} |
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} |
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return 0; |
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} |
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|
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/** |
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* kdb_handle_escape() - validity check on an accumulated escape sequence. |
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* @buf: Accumulated escape characters to be examined. Note that buf |
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* is not a string, it is an array of characters and need not be |
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* nil terminated. |
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* @sz: Number of accumulated escape characters. |
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* |
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* Return: -1 if the escape sequence is unwanted, 0 if it is incomplete, |
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* otherwise it returns a mapped key value to pass to the upper layers. |
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*/ |
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static int kdb_handle_escape(char *buf, size_t sz) |
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{ |
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char *lastkey = buf + sz - 1; |
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|
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switch (sz) { |
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case 1: |
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if (*lastkey == '\e') |
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return 0; |
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break; |
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|
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case 2: /* \e<something> */ |
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if (*lastkey == '[') |
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return 0; |
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break; |
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case 3: |
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switch (*lastkey) { |
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case 'A': /* \e[A, up arrow */ |
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return 16; |
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case 'B': /* \e[B, down arrow */ |
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return 14; |
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case 'C': /* \e[C, right arrow */ |
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return 6; |
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case 'D': /* \e[D, left arrow */ |
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return 2; |
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case '1': /* \e[<1,3,4>], may be home, del, end */ |
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case '3': |
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case '4': |
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return 0; |
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} |
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break; |
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case 4: |
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if (*lastkey == '~') { |
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switch (buf[2]) { |
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case '1': /* \e[1~, home */ |
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return 1; |
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case '3': /* \e[3~, del */ |
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return 4; |
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case '4': /* \e[4~, end */ |
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return 5; |
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} |
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} |
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break; |
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} |
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return -1; |
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} |
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/** |
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* kdb_getchar() - Read a single character from a kdb console (or consoles). |
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* |
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* Other than polling the various consoles that are currently enabled, |
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* most of the work done in this function is dealing with escape sequences. |
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* |
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* An escape key could be the start of a vt100 control sequence such as \e[D |
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* (left arrow) or it could be a character in its own right. The standard |
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* method for detecting the difference is to wait for 2 seconds to see if there |
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* are any other characters. kdb is complicated by the lack of a timer service |
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* (interrupts are off), by multiple input sources. Escape sequence processing |
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* has to be done as states in the polling loop. |
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* |
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* Return: The key pressed or a control code derived from an escape sequence. |
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*/ |
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char kdb_getchar(void) |
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{ |
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#define ESCAPE_UDELAY 1000 |
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#define ESCAPE_DELAY (2*1000000/ESCAPE_UDELAY) /* 2 seconds worth of udelays */ |
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char buf[4]; /* longest vt100 escape sequence is 4 bytes */ |
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char *pbuf = buf; |
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int escape_delay = 0; |
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get_char_func *f, *f_prev = NULL; |
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int key; |
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for (f = &kdb_poll_funcs[0]; ; ++f) { |
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if (*f == NULL) { |
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/* Reset NMI watchdog once per poll loop */ |
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touch_nmi_watchdog(); |
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f = &kdb_poll_funcs[0]; |
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} |
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key = (*f)(); |
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if (key == -1) { |
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if (escape_delay) { |
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udelay(ESCAPE_UDELAY); |
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if (--escape_delay == 0) |
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return '\e'; |
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} |
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continue; |
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} |
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/* |
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* When the first character is received (or we get a change |
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* input source) we set ourselves up to handle an escape |
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* sequences (just in case). |
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*/ |
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if (f_prev != f) { |
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f_prev = f; |
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pbuf = buf; |
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escape_delay = ESCAPE_DELAY; |
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} |
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*pbuf++ = key; |
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key = kdb_handle_escape(buf, pbuf - buf); |
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if (key < 0) /* no escape sequence; return best character */ |
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return buf[pbuf - buf == 2 ? 1 : 0]; |
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if (key > 0) |
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return key; |
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} |
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unreachable(); |
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} |
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/* |
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* kdb_read |
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* |
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* This function reads a string of characters, terminated by |
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* a newline, or by reaching the end of the supplied buffer, |
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* from the current kernel debugger console device. |
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* Parameters: |
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* buffer - Address of character buffer to receive input characters. |
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* bufsize - size, in bytes, of the character buffer |
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* Returns: |
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* Returns a pointer to the buffer containing the received |
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* character string. This string will be terminated by a |
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* newline character. |
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* Locking: |
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* No locks are required to be held upon entry to this |
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* function. It is not reentrant - it relies on the fact |
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* that while kdb is running on only one "master debug" cpu. |
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* Remarks: |
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* The buffer size must be >= 2. |
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*/ |
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static char *kdb_read(char *buffer, size_t bufsize) |
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{ |
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char *cp = buffer; |
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char *bufend = buffer+bufsize-2; /* Reserve space for newline |
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* and null byte */ |
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char *lastchar; |
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char *p_tmp; |
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char tmp; |
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static char tmpbuffer[CMD_BUFLEN]; |
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int len = strlen(buffer); |
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int len_tmp; |
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int tab = 0; |
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int count; |
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int i; |
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int diag, dtab_count; |
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int key, buf_size, ret; |
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diag = kdbgetintenv("DTABCOUNT", &dtab_count); |
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if (diag) |
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dtab_count = 30; |
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if (len > 0) { |
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cp += len; |
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if (*(buffer+len-1) == '\n') |
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cp--; |
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} |
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lastchar = cp; |
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*cp = '\0'; |
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kdb_printf("%s", buffer); |
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poll_again: |
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key = kdb_getchar(); |
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if (key != 9) |
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tab = 0; |
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switch (key) { |
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case 8: /* backspace */ |
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if (cp > buffer) { |
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if (cp < lastchar) { |
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memcpy(tmpbuffer, cp, lastchar - cp); |
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memcpy(cp-1, tmpbuffer, lastchar - cp); |
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} |
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*(--lastchar) = '\0'; |
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--cp; |
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kdb_printf("\b%s \r", cp); |
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tmp = *cp; |
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*cp = '\0'; |
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kdb_printf(kdb_prompt_str); |
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kdb_printf("%s", buffer); |
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*cp = tmp; |
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} |
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break; |
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case 13: /* enter */ |
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*lastchar++ = '\n'; |
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*lastchar++ = '\0'; |
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if (!KDB_STATE(KGDB_TRANS)) { |
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KDB_STATE_SET(KGDB_TRANS); |
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kdb_printf("%s", buffer); |
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} |
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kdb_printf("\n"); |
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return buffer; |
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case 4: /* Del */ |
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if (cp < lastchar) { |
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memcpy(tmpbuffer, cp+1, lastchar - cp - 1); |
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memcpy(cp, tmpbuffer, lastchar - cp - 1); |
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*(--lastchar) = '\0'; |
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kdb_printf("%s \r", cp); |
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tmp = *cp; |
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*cp = '\0'; |
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kdb_printf(kdb_prompt_str); |
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kdb_printf("%s", buffer); |
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*cp = tmp; |
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} |
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break; |
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case 1: /* Home */ |
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if (cp > buffer) { |
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kdb_printf("\r"); |
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kdb_printf(kdb_prompt_str); |
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cp = buffer; |
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} |
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break; |
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case 5: /* End */ |
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if (cp < lastchar) { |
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kdb_printf("%s", cp); |
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cp = lastchar; |
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} |
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break; |
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case 2: /* Left */ |
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if (cp > buffer) { |
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kdb_printf("\b"); |
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--cp; |
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} |
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break; |
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case 14: /* Down */ |
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memset(tmpbuffer, ' ', |
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strlen(kdb_prompt_str) + (lastchar-buffer)); |
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*(tmpbuffer+strlen(kdb_prompt_str) + |
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(lastchar-buffer)) = '\0'; |
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kdb_printf("\r%s\r", tmpbuffer); |
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*lastchar = (char)key; |
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*(lastchar+1) = '\0'; |
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return lastchar; |
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case 6: /* Right */ |
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if (cp < lastchar) { |
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kdb_printf("%c", *cp); |
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++cp; |
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} |
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break; |
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case 16: /* Up */ |
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memset(tmpbuffer, ' ', |
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strlen(kdb_prompt_str) + (lastchar-buffer)); |
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*(tmpbuffer+strlen(kdb_prompt_str) + |
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(lastchar-buffer)) = '\0'; |
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kdb_printf("\r%s\r", tmpbuffer); |
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*lastchar = (char)key; |
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*(lastchar+1) = '\0'; |
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return lastchar; |
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case 9: /* Tab */ |
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if (tab < 2) |
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++tab; |
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p_tmp = buffer; |
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while (*p_tmp == ' ') |
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p_tmp++; |
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if (p_tmp > cp) |
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break; |
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memcpy(tmpbuffer, p_tmp, cp-p_tmp); |
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*(tmpbuffer + (cp-p_tmp)) = '\0'; |
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p_tmp = strrchr(tmpbuffer, ' '); |
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if (p_tmp) |
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++p_tmp; |
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else |
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p_tmp = tmpbuffer; |
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len = strlen(p_tmp); |
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buf_size = sizeof(tmpbuffer) - (p_tmp - tmpbuffer); |
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count = kallsyms_symbol_complete(p_tmp, buf_size); |
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if (tab == 2 && count > 0) { |
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kdb_printf("\n%d symbols are found.", count); |
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if (count > dtab_count) { |
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count = dtab_count; |
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kdb_printf(" But only first %d symbols will" |
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" be printed.\nYou can change the" |
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" environment variable DTABCOUNT.", |
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count); |
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} |
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kdb_printf("\n"); |
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for (i = 0; i < count; i++) { |
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ret = kallsyms_symbol_next(p_tmp, i, buf_size); |
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if (WARN_ON(!ret)) |
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break; |
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if (ret != -E2BIG) |
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kdb_printf("%s ", p_tmp); |
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else |
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kdb_printf("%s... ", p_tmp); |
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*(p_tmp + len) = '\0'; |
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} |
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if (i >= dtab_count) |
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kdb_printf("..."); |
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kdb_printf("\n"); |
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kdb_printf(kdb_prompt_str); |
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kdb_printf("%s", buffer); |
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} else if (tab != 2 && count > 0) { |
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len_tmp = strlen(p_tmp); |
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strncpy(p_tmp+len_tmp, cp, lastchar-cp+1); |
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len_tmp = strlen(p_tmp); |
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strncpy(cp, p_tmp+len, len_tmp-len + 1); |
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len = len_tmp - len; |
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kdb_printf("%s", cp); |
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cp += len; |
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lastchar += len; |
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} |
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kdb_nextline = 1; /* reset output line number */ |
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break; |
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default: |
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if (key >= 32 && lastchar < bufend) { |
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if (cp < lastchar) { |
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memcpy(tmpbuffer, cp, lastchar - cp); |
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memcpy(cp+1, tmpbuffer, lastchar - cp); |
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*++lastchar = '\0'; |
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*cp = key; |
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kdb_printf("%s\r", cp); |
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++cp; |
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tmp = *cp; |
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*cp = '\0'; |
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kdb_printf(kdb_prompt_str); |
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kdb_printf("%s", buffer); |
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*cp = tmp; |
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} else { |
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*++lastchar = '\0'; |
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*cp++ = key; |
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/* The kgdb transition check will hide |
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* printed characters if we think that |
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* kgdb is connecting, until the check |
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* fails */ |
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if (!KDB_STATE(KGDB_TRANS)) { |
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if (kgdb_transition_check(buffer)) |
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return buffer; |
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} else { |
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kdb_printf("%c", key); |
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} |
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} |
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/* Special escape to kgdb */ |
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if (lastchar - buffer >= 5 && |
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strcmp(lastchar - 5, "$?#3f") == 0) { |
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kdb_gdb_state_pass(lastchar - 5); |
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strcpy(buffer, "kgdb"); |
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KDB_STATE_SET(DOING_KGDB); |
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return buffer; |
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} |
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if (lastchar - buffer >= 11 && |
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strcmp(lastchar - 11, "$qSupported") == 0) { |
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kdb_gdb_state_pass(lastchar - 11); |
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strcpy(buffer, "kgdb"); |
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KDB_STATE_SET(DOING_KGDB); |
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return buffer; |
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} |
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} |
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break; |
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} |
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goto poll_again; |
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} |
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|
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/* |
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* kdb_getstr |
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* |
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* Print the prompt string and read a command from the |
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* input device. |
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* |
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* Parameters: |
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* buffer Address of buffer to receive command |
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* bufsize Size of buffer in bytes |
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* prompt Pointer to string to use as prompt string |
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* Returns: |
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* Pointer to command buffer. |
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* Locking: |
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* None. |
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* Remarks: |
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* For SMP kernels, the processor number will be |
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* substituted for %d, %x or %o in the prompt. |
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*/ |
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char *kdb_getstr(char *buffer, size_t bufsize, const char *prompt) |
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{ |
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if (prompt && kdb_prompt_str != prompt) |
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strscpy(kdb_prompt_str, prompt, CMD_BUFLEN); |
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kdb_printf(kdb_prompt_str); |
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kdb_nextline = 1; /* Prompt and input resets line number */ |
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return kdb_read(buffer, bufsize); |
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} |
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/* |
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* kdb_input_flush |
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* |
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* Get rid of any buffered console input. |
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* |
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* Parameters: |
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* none |
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* Returns: |
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* nothing |
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* Locking: |
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* none |
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* Remarks: |
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* Call this function whenever you want to flush input. If there is any |
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* outstanding input, it ignores all characters until there has been no |
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* data for approximately 1ms. |
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*/ |
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static void kdb_input_flush(void) |
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{ |
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get_char_func *f; |
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int res; |
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int flush_delay = 1; |
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while (flush_delay) { |
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flush_delay--; |
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empty: |
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touch_nmi_watchdog(); |
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for (f = &kdb_poll_funcs[0]; *f; ++f) { |
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res = (*f)(); |
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if (res != -1) { |
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flush_delay = 1; |
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goto empty; |
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} |
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} |
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if (flush_delay) |
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mdelay(1); |
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} |
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} |
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|
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/* |
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* kdb_printf |
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* |
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* Print a string to the output device(s). |
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* |
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* Parameters: |
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* printf-like format and optional args. |
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* Returns: |
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* 0 |
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* Locking: |
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* None. |
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* Remarks: |
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* use 'kdbcons->write()' to avoid polluting 'log_buf' with |
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* kdb output. |
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* |
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* If the user is doing a cmd args | grep srch |
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* then kdb_grepping_flag is set. |
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* In that case we need to accumulate full lines (ending in \n) before |
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* searching for the pattern. |
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*/ |
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static char kdb_buffer[256]; /* A bit too big to go on stack */ |
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static char *next_avail = kdb_buffer; |
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static int size_avail; |
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static int suspend_grep; |
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|
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/* |
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* search arg1 to see if it contains arg2 |
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* (kdmain.c provides flags for ^pat and pat$) |
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* |
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* return 1 for found, 0 for not found |
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*/ |
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static int kdb_search_string(char *searched, char *searchfor) |
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{ |
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char firstchar, *cp; |
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int len1, len2; |
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|
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/* not counting the newline at the end of "searched" */ |
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len1 = strlen(searched)-1; |
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len2 = strlen(searchfor); |
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if (len1 < len2) |
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return 0; |
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if (kdb_grep_leading && kdb_grep_trailing && len1 != len2) |
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return 0; |
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if (kdb_grep_leading) { |
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if (!strncmp(searched, searchfor, len2)) |
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return 1; |
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} else if (kdb_grep_trailing) { |
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if (!strncmp(searched+len1-len2, searchfor, len2)) |
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return 1; |
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} else { |
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firstchar = *searchfor; |
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cp = searched; |
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while ((cp = strchr(cp, firstchar))) { |
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if (!strncmp(cp, searchfor, len2)) |
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return 1; |
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cp++; |
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} |
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} |
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return 0; |
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} |
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static void kdb_msg_write(const char *msg, int msg_len) |
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{ |
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struct console *c; |
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const char *cp; |
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int len; |
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|
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if (msg_len == 0) |
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return; |
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cp = msg; |
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len = msg_len; |
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|
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while (len--) { |
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dbg_io_ops->write_char(*cp); |
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cp++; |
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} |
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|
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for_each_console(c) { |
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if (!(c->flags & CON_ENABLED)) |
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continue; |
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if (c == dbg_io_ops->cons) |
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continue; |
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/* |
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* Set oops_in_progress to encourage the console drivers to |
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* disregard their internal spin locks: in the current calling |
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* context the risk of deadlock is a bigger problem than risks |
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* due to re-entering the console driver. We operate directly on |
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* oops_in_progress rather than using bust_spinlocks() because |
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* the calls bust_spinlocks() makes on exit are not appropriate |
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* for this calling context. |
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*/ |
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++oops_in_progress; |
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c->write(c, msg, msg_len); |
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--oops_in_progress; |
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touch_nmi_watchdog(); |
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} |
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} |
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|
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int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap) |
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{ |
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int diag; |
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int linecount; |
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int colcount; |
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int logging, saved_loglevel = 0; |
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int retlen = 0; |
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int fnd, len; |
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int this_cpu, old_cpu; |
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char *cp, *cp2, *cphold = NULL, replaced_byte = ' '; |
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char *moreprompt = "more> "; |
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unsigned long flags; |
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|
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/* Serialize kdb_printf if multiple cpus try to write at once. |
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* But if any cpu goes recursive in kdb, just print the output, |
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* even if it is interleaved with any other text. |
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*/ |
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local_irq_save(flags); |
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this_cpu = smp_processor_id(); |
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for (;;) { |
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old_cpu = cmpxchg(&kdb_printf_cpu, -1, this_cpu); |
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if (old_cpu == -1 || old_cpu == this_cpu) |
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break; |
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|
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cpu_relax(); |
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} |
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|
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diag = kdbgetintenv("LINES", &linecount); |
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if (diag || linecount <= 1) |
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linecount = 24; |
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|
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diag = kdbgetintenv("COLUMNS", &colcount); |
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if (diag || colcount <= 1) |
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colcount = 80; |
|
|
|
diag = kdbgetintenv("LOGGING", &logging); |
|
if (diag) |
|
logging = 0; |
|
|
|
if (!kdb_grepping_flag || suspend_grep) { |
|
/* normally, every vsnprintf starts a new buffer */ |
|
next_avail = kdb_buffer; |
|
size_avail = sizeof(kdb_buffer); |
|
} |
|
vsnprintf(next_avail, size_avail, fmt, ap); |
|
|
|
/* |
|
* If kdb_parse() found that the command was cmd xxx | grep yyy |
|
* then kdb_grepping_flag is set, and kdb_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 && kdb_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(kdb_prompt_str); |
|
if (!strncmp(cp2, kdb_prompt_str, len)) { |
|
/* |
|
* We're about to start a new |
|
* command, so we can go back |
|
* to normal mode. |
|
*/ |
|
kdb_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, kdb_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; |
|
} |
|
if (kdb_grepping_flag >= KDB_GREPPING_FLAG_SEARCH) { |
|
/* |
|
* This was a interactive search (using '/' at more |
|
* prompt) and it has completed. Replace the \0 with |
|
* its original value to ensure multi-line strings |
|
* are handled properly, and return to normal mode. |
|
*/ |
|
*cphold = replaced_byte; |
|
kdb_grepping_flag = 0; |
|
} |
|
/* |
|
* at this point the string is a full line and |
|
* should be printed, up to the null. |
|
*/ |
|
} |
|
kdb_printit: |
|
|
|
/* |
|
* Write to all consoles. |
|
*/ |
|
retlen = strlen(kdb_buffer); |
|
cp = (char *) printk_skip_headers(kdb_buffer); |
|
if (!dbg_kdb_mode && kgdb_connected) |
|
gdbstub_msg_write(cp, retlen - (cp - kdb_buffer)); |
|
else |
|
kdb_msg_write(cp, retlen - (cp - kdb_buffer)); |
|
|
|
if (logging) { |
|
saved_loglevel = console_loglevel; |
|
console_loglevel = CONSOLE_LOGLEVEL_SILENT; |
|
if (printk_get_level(kdb_buffer) || src == KDB_MSGSRC_PRINTK) |
|
printk("%s", kdb_buffer); |
|
else |
|
pr_info("%s", kdb_buffer); |
|
} |
|
|
|
if (KDB_STATE(PAGER)) { |
|
/* |
|
* Check printed string to decide how to bump the |
|
* kdb_nextline to control when the more prompt should |
|
* show up. |
|
*/ |
|
int got = 0; |
|
len = retlen; |
|
while (len--) { |
|
if (kdb_buffer[len] == '\n') { |
|
kdb_nextline++; |
|
got = 0; |
|
} else if (kdb_buffer[len] == '\r') { |
|
got = 0; |
|
} else { |
|
got++; |
|
} |
|
} |
|
kdb_nextline += got / (colcount + 1); |
|
} |
|
|
|
/* check for having reached the LINES number of printed lines */ |
|
if (kdb_nextline >= linecount) { |
|
char ch; |
|
|
|
/* Watch out for recursion here. Any routine that calls |
|
* kdb_printf will come back through here. And kdb_read |
|
* uses kdb_printf to echo on serial consoles ... |
|
*/ |
|
kdb_nextline = 1; /* In case of recursion */ |
|
|
|
/* |
|
* Pause until cr. |
|
*/ |
|
moreprompt = kdbgetenv("MOREPROMPT"); |
|
if (moreprompt == NULL) |
|
moreprompt = "more> "; |
|
|
|
kdb_input_flush(); |
|
kdb_msg_write(moreprompt, strlen(moreprompt)); |
|
|
|
if (logging) |
|
printk("%s", moreprompt); |
|
|
|
ch = kdb_getchar(); |
|
kdb_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 ((ch == 'q') || (ch == 'Q')) { |
|
/* user hit q or Q */ |
|
KDB_FLAG_SET(CMD_INTERRUPT); /* command interrupted */ |
|
KDB_STATE_CLEAR(PAGER); |
|
/* end of command output; back to normal mode */ |
|
kdb_grepping_flag = 0; |
|
kdb_printf("\n"); |
|
} else if (ch == ' ') { |
|
kdb_printf("\r"); |
|
suspend_grep = 1; /* for this recursion */ |
|
} else if (ch == '\n' || ch == '\r') { |
|
kdb_nextline = linecount - 1; |
|
kdb_printf("\r"); |
|
suspend_grep = 1; /* for this recursion */ |
|
} else if (ch == '/' && !kdb_grepping_flag) { |
|
kdb_printf("\r"); |
|
kdb_getstr(kdb_grep_string, KDB_GREP_STRLEN, |
|
kdbgetenv("SEARCHPROMPT") ?: "search> "); |
|
*strchrnul(kdb_grep_string, '\n') = '\0'; |
|
kdb_grepping_flag += KDB_GREPPING_FLAG_SEARCH; |
|
suspend_grep = 1; /* for this recursion */ |
|
} else if (ch) { |
|
/* user hit something unexpected */ |
|
suspend_grep = 1; /* for this recursion */ |
|
if (ch != '/') |
|
kdb_printf( |
|
"\nOnly 'q', 'Q' or '/' are processed at " |
|
"more prompt, input ignored\n"); |
|
else |
|
kdb_printf("\n'/' cannot be used during | " |
|
"grep filtering, input ignored\n"); |
|
} else if (kdb_grepping_flag) { |
|
/* user hit enter */ |
|
suspend_grep = 1; /* for this recursion */ |
|
kdb_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 (kdb_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; |
|
/* kdb_printf_cpu locked the code above. */ |
|
smp_store_release(&kdb_printf_cpu, old_cpu); |
|
local_irq_restore(flags); |
|
return retlen; |
|
} |
|
|
|
int kdb_printf(const char *fmt, ...) |
|
{ |
|
va_list ap; |
|
int r; |
|
|
|
va_start(ap, fmt); |
|
r = vkdb_printf(KDB_MSGSRC_INTERNAL, fmt, ap); |
|
va_end(ap); |
|
|
|
return r; |
|
} |
|
EXPORT_SYMBOL_GPL(kdb_printf);
|
|
|