867 lines
21 KiB
C
867 lines
21 KiB
C
/*
|
|
* 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.
|
|
* Copyright (c) 2009 Wind River Systems, 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/kgdb.h>
|
|
#include <linux/kdb.h>
|
|
#include <linux/kallsyms.h>
|
|
#include "kdb_private.h"
|
|
|
|
#define CMD_BUFLEN 256
|
|
char kdb_prompt_str[CMD_BUFLEN];
|
|
|
|
int kdb_trap_printk;
|
|
int kdb_printf_cpu = -1;
|
|
|
|
static int kgdb_transition_check(char *buffer)
|
|
{
|
|
if (buffer[0] != '+' && buffer[0] != '$') {
|
|
KDB_STATE_SET(KGDB_TRANS);
|
|
kdb_printf("%s", buffer);
|
|
} else {
|
|
int slen = strlen(buffer);
|
|
if (slen > 3 && buffer[slen - 3] == '#') {
|
|
kdb_gdb_state_pass(buffer);
|
|
strcpy(buffer, "kgdb");
|
|
KDB_STATE_SET(DOING_KGDB);
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* kdb_handle_escape() - validity check on an accumulated escape sequence.
|
|
* @buf: Accumulated escape characters to be examined. Note that buf
|
|
* is not a string, it is an array of characters and need not be
|
|
* nil terminated.
|
|
* @sz: Number of accumulated escape characters.
|
|
*
|
|
* Return: -1 if the escape sequence is unwanted, 0 if it is incomplete,
|
|
* otherwise it returns a mapped key value to pass to the upper layers.
|
|
*/
|
|
static int kdb_handle_escape(char *buf, size_t sz)
|
|
{
|
|
char *lastkey = buf + sz - 1;
|
|
|
|
switch (sz) {
|
|
case 1:
|
|
if (*lastkey == '\e')
|
|
return 0;
|
|
break;
|
|
|
|
case 2: /* \e<something> */
|
|
if (*lastkey == '[')
|
|
return 0;
|
|
break;
|
|
|
|
case 3:
|
|
switch (*lastkey) {
|
|
case 'A': /* \e[A, up arrow */
|
|
return 16;
|
|
case 'B': /* \e[B, down arrow */
|
|
return 14;
|
|
case 'C': /* \e[C, right arrow */
|
|
return 6;
|
|
case 'D': /* \e[D, left arrow */
|
|
return 2;
|
|
case '1': /* \e[<1,3,4>], may be home, del, end */
|
|
case '3':
|
|
case '4':
|
|
return 0;
|
|
}
|
|
break;
|
|
|
|
case 4:
|
|
if (*lastkey == '~') {
|
|
switch (buf[2]) {
|
|
case '1': /* \e[1~, home */
|
|
return 1;
|
|
case '3': /* \e[3~, del */
|
|
return 4;
|
|
case '4': /* \e[4~, end */
|
|
return 5;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* kdb_getchar() - Read a single character from a kdb console (or consoles).
|
|
*
|
|
* Other than polling the various consoles that are currently enabled,
|
|
* most of the work done in this function is dealing with escape sequences.
|
|
*
|
|
* 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. Escape sequence processing
|
|
* has to be done as states in the polling loop.
|
|
*
|
|
* Return: The key pressed or a control code derived from an escape sequence.
|
|
*/
|
|
char kdb_getchar(void)
|
|
{
|
|
#define ESCAPE_UDELAY 1000
|
|
#define ESCAPE_DELAY (2*1000000/ESCAPE_UDELAY) /* 2 seconds worth of udelays */
|
|
char buf[4]; /* longest vt100 escape sequence is 4 bytes */
|
|
char *pbuf = buf;
|
|
int escape_delay = 0;
|
|
get_char_func *f, *f_prev = NULL;
|
|
int key;
|
|
|
|
for (f = &kdb_poll_funcs[0]; ; ++f) {
|
|
if (*f == NULL) {
|
|
/* Reset NMI watchdog once per poll loop */
|
|
touch_nmi_watchdog();
|
|
f = &kdb_poll_funcs[0];
|
|
}
|
|
|
|
key = (*f)();
|
|
if (key == -1) {
|
|
if (escape_delay) {
|
|
udelay(ESCAPE_UDELAY);
|
|
if (--escape_delay == 0)
|
|
return '\e';
|
|
}
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* When the first character is received (or we get a change
|
|
* input source) we set ourselves up to handle an escape
|
|
* sequences (just in case).
|
|
*/
|
|
if (f_prev != f) {
|
|
f_prev = f;
|
|
pbuf = buf;
|
|
escape_delay = ESCAPE_DELAY;
|
|
}
|
|
|
|
*pbuf++ = key;
|
|
key = kdb_handle_escape(buf, pbuf - buf);
|
|
if (key < 0) /* no escape sequence; return best character */
|
|
return buf[pbuf - buf == 2 ? 1 : 0];
|
|
if (key > 0)
|
|
return key;
|
|
}
|
|
|
|
unreachable();
|
|
}
|
|
|
|
/*
|
|
* 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 only one "master debug" cpu.
|
|
* Remarks:
|
|
* The buffer size must be >= 2.
|
|
*/
|
|
|
|
static 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;
|
|
int key, buf_size, ret;
|
|
|
|
|
|
diag = kdbgetintenv("DTABCOUNT", &dtab_count);
|
|
if (diag)
|
|
dtab_count = 30;
|
|
|
|
if (len > 0) {
|
|
cp += len;
|
|
if (*(buffer+len-1) == '\n')
|
|
cp--;
|
|
}
|
|
|
|
lastchar = cp;
|
|
*cp = '\0';
|
|
kdb_printf("%s", buffer);
|
|
poll_again:
|
|
key = kdb_getchar();
|
|
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;
|
|
kdb_printf("\b%s \r", cp);
|
|
tmp = *cp;
|
|
*cp = '\0';
|
|
kdb_printf(kdb_prompt_str);
|
|
kdb_printf("%s", buffer);
|
|
*cp = tmp;
|
|
}
|
|
break;
|
|
case 13: /* enter */
|
|
*lastchar++ = '\n';
|
|
*lastchar++ = '\0';
|
|
if (!KDB_STATE(KGDB_TRANS)) {
|
|
KDB_STATE_SET(KGDB_TRANS);
|
|
kdb_printf("%s", buffer);
|
|
}
|
|
kdb_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';
|
|
kdb_printf("%s \r", cp);
|
|
tmp = *cp;
|
|
*cp = '\0';
|
|
kdb_printf(kdb_prompt_str);
|
|
kdb_printf("%s", buffer);
|
|
*cp = tmp;
|
|
}
|
|
break;
|
|
case 1: /* Home */
|
|
if (cp > buffer) {
|
|
kdb_printf("\r");
|
|
kdb_printf(kdb_prompt_str);
|
|
cp = buffer;
|
|
}
|
|
break;
|
|
case 5: /* End */
|
|
if (cp < lastchar) {
|
|
kdb_printf("%s", cp);
|
|
cp = lastchar;
|
|
}
|
|
break;
|
|
case 2: /* Left */
|
|
if (cp > buffer) {
|
|
kdb_printf("\b");
|
|
--cp;
|
|
}
|
|
break;
|
|
case 14: /* Down */
|
|
memset(tmpbuffer, ' ',
|
|
strlen(kdb_prompt_str) + (lastchar-buffer));
|
|
*(tmpbuffer+strlen(kdb_prompt_str) +
|
|
(lastchar-buffer)) = '\0';
|
|
kdb_printf("\r%s\r", tmpbuffer);
|
|
*lastchar = (char)key;
|
|
*(lastchar+1) = '\0';
|
|
return lastchar;
|
|
case 6: /* Right */
|
|
if (cp < lastchar) {
|
|
kdb_printf("%c", *cp);
|
|
++cp;
|
|
}
|
|
break;
|
|
case 16: /* Up */
|
|
memset(tmpbuffer, ' ',
|
|
strlen(kdb_prompt_str) + (lastchar-buffer));
|
|
*(tmpbuffer+strlen(kdb_prompt_str) +
|
|
(lastchar-buffer)) = '\0';
|
|
kdb_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)
|
|
break;
|
|
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);
|
|
buf_size = sizeof(tmpbuffer) - (p_tmp - tmpbuffer);
|
|
count = kallsyms_symbol_complete(p_tmp, buf_size);
|
|
if (tab == 2 && count > 0) {
|
|
kdb_printf("\n%d symbols are found.", count);
|
|
if (count > dtab_count) {
|
|
count = dtab_count;
|
|
kdb_printf(" But only first %d symbols will"
|
|
" be printed.\nYou can change the"
|
|
" environment variable DTABCOUNT.",
|
|
count);
|
|
}
|
|
kdb_printf("\n");
|
|
for (i = 0; i < count; i++) {
|
|
ret = kallsyms_symbol_next(p_tmp, i, buf_size);
|
|
if (WARN_ON(!ret))
|
|
break;
|
|
if (ret != -E2BIG)
|
|
kdb_printf("%s ", p_tmp);
|
|
else
|
|
kdb_printf("%s... ", p_tmp);
|
|
*(p_tmp + len) = '\0';
|
|
}
|
|
if (i >= dtab_count)
|
|
kdb_printf("...");
|
|
kdb_printf("\n");
|
|
kdb_printf(kdb_prompt_str);
|
|
kdb_printf("%s", buffer);
|
|
} else if (tab != 2 && 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;
|
|
kdb_printf("%s", cp);
|
|
cp += len;
|
|
lastchar += len;
|
|
}
|
|
kdb_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;
|
|
kdb_printf("%s\r", cp);
|
|
++cp;
|
|
tmp = *cp;
|
|
*cp = '\0';
|
|
kdb_printf(kdb_prompt_str);
|
|
kdb_printf("%s", buffer);
|
|
*cp = tmp;
|
|
} else {
|
|
*++lastchar = '\0';
|
|
*cp++ = key;
|
|
/* The kgdb transition check will hide
|
|
* printed characters if we think that
|
|
* kgdb is connecting, until the check
|
|
* fails */
|
|
if (!KDB_STATE(KGDB_TRANS)) {
|
|
if (kgdb_transition_check(buffer))
|
|
return buffer;
|
|
} else {
|
|
kdb_printf("%c", key);
|
|
}
|
|
}
|
|
/* Special escape to kgdb */
|
|
if (lastchar - buffer >= 5 &&
|
|
strcmp(lastchar - 5, "$?#3f") == 0) {
|
|
kdb_gdb_state_pass(lastchar - 5);
|
|
strcpy(buffer, "kgdb");
|
|
KDB_STATE_SET(DOING_KGDB);
|
|
return buffer;
|
|
}
|
|
if (lastchar - buffer >= 11 &&
|
|
strcmp(lastchar - 11, "$qSupported") == 0) {
|
|
kdb_gdb_state_pass(lastchar - 11);
|
|
strcpy(buffer, "kgdb");
|
|
KDB_STATE_SET(DOING_KGDB);
|
|
return buffer;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
goto poll_again;
|
|
}
|
|
|
|
/*
|
|
* kdb_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 *kdb_getstr(char *buffer, size_t bufsize, const char *prompt)
|
|
{
|
|
if (prompt && kdb_prompt_str != prompt)
|
|
strscpy(kdb_prompt_str, prompt, CMD_BUFLEN);
|
|
kdb_printf(kdb_prompt_str);
|
|
kdb_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 1ms.
|
|
*/
|
|
|
|
static void kdb_input_flush(void)
|
|
{
|
|
get_char_func *f;
|
|
int res;
|
|
int flush_delay = 1;
|
|
while (flush_delay) {
|
|
flush_delay--;
|
|
empty:
|
|
touch_nmi_watchdog();
|
|
for (f = &kdb_poll_funcs[0]; *f; ++f) {
|
|
res = (*f)();
|
|
if (res != -1) {
|
|
flush_delay = 1;
|
|
goto empty;
|
|
}
|
|
}
|
|
if (flush_delay)
|
|
mdelay(1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* kdb_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 kdb_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;
|
|
|
|
/*
|
|
* search arg1 to see if it contains arg2
|
|
* (kdmain.c provides flags for ^pat and pat$)
|
|
*
|
|
* return 1 for found, 0 for not found
|
|
*/
|
|
static 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 (kdb_grep_leading && kdb_grep_trailing && len1 != len2)
|
|
return 0;
|
|
if (kdb_grep_leading) {
|
|
if (!strncmp(searched, searchfor, len2))
|
|
return 1;
|
|
} else if (kdb_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;
|
|
}
|
|
|
|
static void kdb_msg_write(const char *msg, int msg_len)
|
|
{
|
|
struct console *c;
|
|
|
|
if (msg_len == 0)
|
|
return;
|
|
|
|
if (dbg_io_ops) {
|
|
const char *cp = msg;
|
|
int len = msg_len;
|
|
|
|
while (len--) {
|
|
dbg_io_ops->write_char(*cp);
|
|
cp++;
|
|
}
|
|
}
|
|
|
|
for_each_console(c) {
|
|
if (!(c->flags & CON_ENABLED))
|
|
continue;
|
|
if (c == dbg_io_ops->cons)
|
|
continue;
|
|
/*
|
|
* Set oops_in_progress to encourage the console drivers to
|
|
* disregard their internal spin locks: in the current calling
|
|
* context the risk of deadlock is a bigger problem than risks
|
|
* due to re-entering the console driver. We operate directly on
|
|
* oops_in_progress rather than using bust_spinlocks() because
|
|
* the calls bust_spinlocks() makes on exit are not appropriate
|
|
* for this calling context.
|
|
*/
|
|
++oops_in_progress;
|
|
c->write(c, msg, msg_len);
|
|
--oops_in_progress;
|
|
touch_nmi_watchdog();
|
|
}
|
|
}
|
|
|
|
int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap)
|
|
{
|
|
int diag;
|
|
int linecount;
|
|
int colcount;
|
|
int logging, saved_loglevel = 0;
|
|
int retlen = 0;
|
|
int fnd, len;
|
|
int this_cpu, old_cpu;
|
|
char *cp, *cp2, *cphold = NULL, replaced_byte = ' ';
|
|
char *moreprompt = "more> ";
|
|
unsigned long flags;
|
|
|
|
/* Serialize kdb_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.
|
|
*/
|
|
local_irq_save(flags);
|
|
this_cpu = smp_processor_id();
|
|
for (;;) {
|
|
old_cpu = cmpxchg(&kdb_printf_cpu, -1, this_cpu);
|
|
if (old_cpu == -1 || old_cpu == this_cpu)
|
|
break;
|
|
|
|
cpu_relax();
|
|
}
|
|
|
|
diag = kdbgetintenv("LINES", &linecount);
|
|
if (diag || linecount <= 1)
|
|
linecount = 24;
|
|
|
|
diag = kdbgetintenv("COLUMNS", &colcount);
|
|
if (diag || colcount <= 1)
|
|
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. Clear the flag.
|
|
*/
|
|
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);
|