linux/kernel/debug/kdb/kdb_io.c

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kdb: core for kgdb back end (1 of 2) This patch contains only the kdb core. Because the change set was large, it was split. The next patch in the series includes the instrumentation into the core kernel which are mainly helper functions for kdb. This work is directly derived from kdb v4.4 found at: ftp://oss.sgi.com/projects/kdb/download/v4.4/ The kdb internals have been re-organized to make them mostly platform independent and to connect everything to the debug core which is used by gdbstub (which has long been known as kgdb). The original version of kdb was 58,000 lines worth of changes to support x86. From that implementation only the kdb shell, and basic commands for memory access, runcontrol, lsmod, and dmesg where carried forward. This is a generic implementation which aims to cover all the current architectures using the kgdb core: ppc, arm, x86, mips, sparc, sh and blackfin. More archictectures can be added by implementing the architecture specific kgdb functions. [mort@sgi.com: Compile fix with hugepages enabled] [mort@sgi.com: Clean breakpoint code renaming kdba_ -> kdb_] [mort@sgi.com: fix new line after printing registers] [mort@sgi.com: Remove the concept of global vs. local breakpoints] [mort@sgi.com: Rework kdb_si_swapinfo to use more generic name] [mort@sgi.com: fix the information dump macros, remove 'arch' from the names] [sfr@canb.auug.org.au: include fixup to include linux/slab.h] CC: linux-arch@vger.kernel.org Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Martin Hicks <mort@sgi.com>
2010-05-21 02:04:20 +00:00
/*
* 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>
kdb: core for kgdb back end (1 of 2) This patch contains only the kdb core. Because the change set was large, it was split. The next patch in the series includes the instrumentation into the core kernel which are mainly helper functions for kdb. This work is directly derived from kdb v4.4 found at: ftp://oss.sgi.com/projects/kdb/download/v4.4/ The kdb internals have been re-organized to make them mostly platform independent and to connect everything to the debug core which is used by gdbstub (which has long been known as kgdb). The original version of kdb was 58,000 lines worth of changes to support x86. From that implementation only the kdb shell, and basic commands for memory access, runcontrol, lsmod, and dmesg where carried forward. This is a generic implementation which aims to cover all the current architectures using the kgdb core: ppc, arm, x86, mips, sparc, sh and blackfin. More archictectures can be added by implementing the architecture specific kgdb functions. [mort@sgi.com: Compile fix with hugepages enabled] [mort@sgi.com: Clean breakpoint code renaming kdba_ -> kdb_] [mort@sgi.com: fix new line after printing registers] [mort@sgi.com: Remove the concept of global vs. local breakpoints] [mort@sgi.com: Rework kdb_si_swapinfo to use more generic name] [mort@sgi.com: fix the information dump macros, remove 'arch' from the names] [sfr@canb.auug.org.au: include fixup to include linux/slab.h] CC: linux-arch@vger.kernel.org Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Martin Hicks <mort@sgi.com>
2010-05-21 02:04:20 +00:00
#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;
kdb: core for kgdb back end (1 of 2) This patch contains only the kdb core. Because the change set was large, it was split. The next patch in the series includes the instrumentation into the core kernel which are mainly helper functions for kdb. This work is directly derived from kdb v4.4 found at: ftp://oss.sgi.com/projects/kdb/download/v4.4/ The kdb internals have been re-organized to make them mostly platform independent and to connect everything to the debug core which is used by gdbstub (which has long been known as kgdb). The original version of kdb was 58,000 lines worth of changes to support x86. From that implementation only the kdb shell, and basic commands for memory access, runcontrol, lsmod, and dmesg where carried forward. This is a generic implementation which aims to cover all the current architectures using the kgdb core: ppc, arm, x86, mips, sparc, sh and blackfin. More archictectures can be added by implementing the architecture specific kgdb functions. [mort@sgi.com: Compile fix with hugepages enabled] [mort@sgi.com: Clean breakpoint code renaming kdba_ -> kdb_] [mort@sgi.com: fix new line after printing registers] [mort@sgi.com: Remove the concept of global vs. local breakpoints] [mort@sgi.com: Rework kdb_si_swapinfo to use more generic name] [mort@sgi.com: fix the information dump macros, remove 'arch' from the names] [sfr@canb.auug.org.au: include fixup to include linux/slab.h] CC: linux-arch@vger.kernel.org Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Martin Hicks <mort@sgi.com>
2010-05-21 02:04:20 +00:00
static void kgdb_transition_check(char *buffer)
{
int slen = strlen(buffer);
if (strncmp(buffer, "$?#3f", slen) != 0 &&
strncmp(buffer, "$qSupported#37", slen) != 0 &&
strncmp(buffer, "+$qSupported#37", slen) != 0) {
KDB_STATE_SET(KGDB_TRANS);
kdb_printf("%s", buffer);
}
}
static int kdb_read_get_key(char *buffer, size_t bufsize)
{
#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;
get_char_func *f, *f_escape = 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];
}
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';
*buffer++ = key;
*buffer = '\0';
return -1;
}
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': /* \e[A, up arrow */
mapkey = 16;
break;
case 'B': /* \e[B, down arrow */
mapkey = 14;
break;
case 'C': /* \e[C, right arrow */
mapkey = 6;
break;
case 'D': /* \e[D, left arrow */
mapkey = 2;
break;
case '1': /* dropthrough */
case '3': /* dropthrough */
/* \e[<1,3,4>], may be home, del, end */
case '4':
mapkey = -1;
break;
}
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': /* \e[1~, home */
mapkey = 1;
break;
case '3': /* \e[3~, del */
mapkey = 4;
break;
case '4': /* \e[4~, end */
mapkey = 5;
break;
}
}
if (mapkey > 0) {
escape_data[0] = mapkey;
escape_data[1] = '\0';
}
escape_delay = 2;
continue;
}
}
break; /* A key to process */
}
return key;
}
/*
* 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. 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.
*/
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;
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_read_get_key(buffer, bufsize);
if (key == -1)
return buffer;
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';
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);
count = kallsyms_symbol_complete(p_tmp,
sizeof(tmpbuffer) -
(p_tmp - tmpbuffer));
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++) {
if (kallsyms_symbol_next(p_tmp, i) < 0)
break;
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))
kgdb_transition_check(buffer);
else
kdb_printf("%c", key);
}
/* Special escape to kgdb */
if (lastchar - buffer >= 5 &&
strcmp(lastchar - 5, "$?#3f") == 0) {
strcpy(buffer, "kgdb");
KDB_STATE_SET(DOING_KGDB);
return buffer;
}
if (lastchar - buffer >= 14 &&
strcmp(lastchar - 14, "$qSupported#37") == 0) {
strcpy(buffer, "kgdb");
KDB_STATE_SET(DOING_KGDB2);
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, char *prompt)
{
if (prompt && kdb_prompt_str != prompt)
strncpy(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;
}
int vkdb_printf(const char *fmt, va_list ap)
kdb: core for kgdb back end (1 of 2) This patch contains only the kdb core. Because the change set was large, it was split. The next patch in the series includes the instrumentation into the core kernel which are mainly helper functions for kdb. This work is directly derived from kdb v4.4 found at: ftp://oss.sgi.com/projects/kdb/download/v4.4/ The kdb internals have been re-organized to make them mostly platform independent and to connect everything to the debug core which is used by gdbstub (which has long been known as kgdb). The original version of kdb was 58,000 lines worth of changes to support x86. From that implementation only the kdb shell, and basic commands for memory access, runcontrol, lsmod, and dmesg where carried forward. This is a generic implementation which aims to cover all the current architectures using the kgdb core: ppc, arm, x86, mips, sparc, sh and blackfin. More archictectures can be added by implementing the architecture specific kgdb functions. [mort@sgi.com: Compile fix with hugepages enabled] [mort@sgi.com: Clean breakpoint code renaming kdba_ -> kdb_] [mort@sgi.com: fix new line after printing registers] [mort@sgi.com: Remove the concept of global vs. local breakpoints] [mort@sgi.com: Rework kdb_si_swapinfo to use more generic name] [mort@sgi.com: fix the information dump macros, remove 'arch' from the names] [sfr@canb.auug.org.au: include fixup to include linux/slab.h] CC: linux-arch@vger.kernel.org Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Martin Hicks <mort@sgi.com>
2010-05-21 02:04:20 +00:00
{
int diag;
int linecount;
int logging, saved_loglevel = 0;
int saved_trap_printk;
kdb: core for kgdb back end (1 of 2) This patch contains only the kdb core. Because the change set was large, it was split. The next patch in the series includes the instrumentation into the core kernel which are mainly helper functions for kdb. This work is directly derived from kdb v4.4 found at: ftp://oss.sgi.com/projects/kdb/download/v4.4/ The kdb internals have been re-organized to make them mostly platform independent and to connect everything to the debug core which is used by gdbstub (which has long been known as kgdb). The original version of kdb was 58,000 lines worth of changes to support x86. From that implementation only the kdb shell, and basic commands for memory access, runcontrol, lsmod, and dmesg where carried forward. This is a generic implementation which aims to cover all the current architectures using the kgdb core: ppc, arm, x86, mips, sparc, sh and blackfin. More archictectures can be added by implementing the architecture specific kgdb functions. [mort@sgi.com: Compile fix with hugepages enabled] [mort@sgi.com: Clean breakpoint code renaming kdba_ -> kdb_] [mort@sgi.com: fix new line after printing registers] [mort@sgi.com: Remove the concept of global vs. local breakpoints] [mort@sgi.com: Rework kdb_si_swapinfo to use more generic name] [mort@sgi.com: fix the information dump macros, remove 'arch' from the names] [sfr@canb.auug.org.au: include fixup to include linux/slab.h] CC: linux-arch@vger.kernel.org Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Martin Hicks <mort@sgi.com>
2010-05-21 02:04:20 +00:00
int got_printf_lock = 0;
int retlen = 0;
int fnd, len;
char *cp, *cp2, *cphold = NULL, replaced_byte = ' ';
char *moreprompt = "more> ";
struct console *c = console_drivers;
static DEFINE_SPINLOCK(kdb_printf_lock);
unsigned long uninitialized_var(flags);
preempt_disable();
saved_trap_printk = kdb_trap_printk;
kdb_trap_printk = 0;
kdb: core for kgdb back end (1 of 2) This patch contains only the kdb core. Because the change set was large, it was split. The next patch in the series includes the instrumentation into the core kernel which are mainly helper functions for kdb. This work is directly derived from kdb v4.4 found at: ftp://oss.sgi.com/projects/kdb/download/v4.4/ The kdb internals have been re-organized to make them mostly platform independent and to connect everything to the debug core which is used by gdbstub (which has long been known as kgdb). The original version of kdb was 58,000 lines worth of changes to support x86. From that implementation only the kdb shell, and basic commands for memory access, runcontrol, lsmod, and dmesg where carried forward. This is a generic implementation which aims to cover all the current architectures using the kgdb core: ppc, arm, x86, mips, sparc, sh and blackfin. More archictectures can be added by implementing the architecture specific kgdb functions. [mort@sgi.com: Compile fix with hugepages enabled] [mort@sgi.com: Clean breakpoint code renaming kdba_ -> kdb_] [mort@sgi.com: fix new line after printing registers] [mort@sgi.com: Remove the concept of global vs. local breakpoints] [mort@sgi.com: Rework kdb_si_swapinfo to use more generic name] [mort@sgi.com: fix the information dump macros, remove 'arch' from the names] [sfr@canb.auug.org.au: include fixup to include linux/slab.h] CC: linux-arch@vger.kernel.org Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Martin Hicks <mort@sgi.com>
2010-05-21 02:04:20 +00:00
/* 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.
*/
if (!KDB_STATE(PRINTF_LOCK)) {
KDB_STATE_SET(PRINTF_LOCK);
spin_lock_irqsave(&kdb_printf_lock, flags);
got_printf_lock = 1;
atomic_inc(&kdb_event);
} else {
__acquire(kdb_printf_lock);
}
diag = kdbgetintenv("LINES", &linecount);
if (diag || linecount <= 1)
linecount = 24;
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;
}
/*
* 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);
if (!dbg_kdb_mode && kgdb_connected) {
gdbstub_msg_write(kdb_buffer, retlen);
} else {
if (!dbg_io_ops->is_console) {
len = strlen(kdb_buffer);
cp = kdb_buffer;
while (len--) {
dbg_io_ops->write_char(*cp);
cp++;
}
}
while (c) {
c->write(c, kdb_buffer, retlen);
touch_nmi_watchdog();
c = c->next;
}
kdb: core for kgdb back end (1 of 2) This patch contains only the kdb core. Because the change set was large, it was split. The next patch in the series includes the instrumentation into the core kernel which are mainly helper functions for kdb. This work is directly derived from kdb v4.4 found at: ftp://oss.sgi.com/projects/kdb/download/v4.4/ The kdb internals have been re-organized to make them mostly platform independent and to connect everything to the debug core which is used by gdbstub (which has long been known as kgdb). The original version of kdb was 58,000 lines worth of changes to support x86. From that implementation only the kdb shell, and basic commands for memory access, runcontrol, lsmod, and dmesg where carried forward. This is a generic implementation which aims to cover all the current architectures using the kgdb core: ppc, arm, x86, mips, sparc, sh and blackfin. More archictectures can be added by implementing the architecture specific kgdb functions. [mort@sgi.com: Compile fix with hugepages enabled] [mort@sgi.com: Clean breakpoint code renaming kdba_ -> kdb_] [mort@sgi.com: fix new line after printing registers] [mort@sgi.com: Remove the concept of global vs. local breakpoints] [mort@sgi.com: Rework kdb_si_swapinfo to use more generic name] [mort@sgi.com: fix the information dump macros, remove 'arch' from the names] [sfr@canb.auug.org.au: include fixup to include linux/slab.h] CC: linux-arch@vger.kernel.org Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Martin Hicks <mort@sgi.com>
2010-05-21 02:04:20 +00:00
}
if (logging) {
saved_loglevel = console_loglevel;
console_loglevel = 0;
printk(KERN_INFO "%s", kdb_buffer);
}
if (KDB_STATE(PAGER) && strchr(kdb_buffer, '\n'))
kdb_nextline++;
/* check for having reached the LINES number of printed lines */
if (kdb_nextline == linecount) {
char buf1[16] = "";
#if defined(CONFIG_SMP)
char buf2[32];
#endif
/* 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> ";
#if defined(CONFIG_SMP)
if (strchr(moreprompt, '%')) {
sprintf(buf2, moreprompt, get_cpu());
put_cpu();
moreprompt = buf2;
}
#endif
kdb_input_flush();
c = console_drivers;
if (!dbg_io_ops->is_console) {
len = strlen(moreprompt);
cp = moreprompt;
while (len--) {
dbg_io_ops->write_char(*cp);
cp++;
}
}
kdb: core for kgdb back end (1 of 2) This patch contains only the kdb core. Because the change set was large, it was split. The next patch in the series includes the instrumentation into the core kernel which are mainly helper functions for kdb. This work is directly derived from kdb v4.4 found at: ftp://oss.sgi.com/projects/kdb/download/v4.4/ The kdb internals have been re-organized to make them mostly platform independent and to connect everything to the debug core which is used by gdbstub (which has long been known as kgdb). The original version of kdb was 58,000 lines worth of changes to support x86. From that implementation only the kdb shell, and basic commands for memory access, runcontrol, lsmod, and dmesg where carried forward. This is a generic implementation which aims to cover all the current architectures using the kgdb core: ppc, arm, x86, mips, sparc, sh and blackfin. More archictectures can be added by implementing the architecture specific kgdb functions. [mort@sgi.com: Compile fix with hugepages enabled] [mort@sgi.com: Clean breakpoint code renaming kdba_ -> kdb_] [mort@sgi.com: fix new line after printing registers] [mort@sgi.com: Remove the concept of global vs. local breakpoints] [mort@sgi.com: Rework kdb_si_swapinfo to use more generic name] [mort@sgi.com: fix the information dump macros, remove 'arch' from the names] [sfr@canb.auug.org.au: include fixup to include linux/slab.h] CC: linux-arch@vger.kernel.org Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Martin Hicks <mort@sgi.com>
2010-05-21 02:04:20 +00:00
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. */
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 ((buf1[0] == 'q') || (buf1[0] == '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 (buf1[0] == ' ') {
kdb_printf("\n");
suspend_grep = 1; /* for this recursion */
} else if (buf1[0] == '\n') {
kdb_nextline = linecount - 1;
kdb_printf("\r");
suspend_grep = 1; /* for this recursion */
} else if (buf1[0] && buf1[0] != '\n') {
/* user hit something other than enter */
suspend_grep = 1; /* for this recursion */
kdb_printf("\nOnly 'q' or 'Q' are processed at more "
"prompt, 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;
if (KDB_STATE(PRINTF_LOCK) && got_printf_lock) {
got_printf_lock = 0;
spin_unlock_irqrestore(&kdb_printf_lock, flags);
KDB_STATE_CLEAR(PRINTF_LOCK);
atomic_dec(&kdb_event);
} else {
__release(kdb_printf_lock);
}
kdb_trap_printk = saved_trap_printk;
kdb: core for kgdb back end (1 of 2) This patch contains only the kdb core. Because the change set was large, it was split. The next patch in the series includes the instrumentation into the core kernel which are mainly helper functions for kdb. This work is directly derived from kdb v4.4 found at: ftp://oss.sgi.com/projects/kdb/download/v4.4/ The kdb internals have been re-organized to make them mostly platform independent and to connect everything to the debug core which is used by gdbstub (which has long been known as kgdb). The original version of kdb was 58,000 lines worth of changes to support x86. From that implementation only the kdb shell, and basic commands for memory access, runcontrol, lsmod, and dmesg where carried forward. This is a generic implementation which aims to cover all the current architectures using the kgdb core: ppc, arm, x86, mips, sparc, sh and blackfin. More archictectures can be added by implementing the architecture specific kgdb functions. [mort@sgi.com: Compile fix with hugepages enabled] [mort@sgi.com: Clean breakpoint code renaming kdba_ -> kdb_] [mort@sgi.com: fix new line after printing registers] [mort@sgi.com: Remove the concept of global vs. local breakpoints] [mort@sgi.com: Rework kdb_si_swapinfo to use more generic name] [mort@sgi.com: fix the information dump macros, remove 'arch' from the names] [sfr@canb.auug.org.au: include fixup to include linux/slab.h] CC: linux-arch@vger.kernel.org Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Martin Hicks <mort@sgi.com>
2010-05-21 02:04:20 +00:00
preempt_enable();
return retlen;
}
int kdb_printf(const char *fmt, ...)
{
va_list ap;
int r;
va_start(ap, fmt);
r = vkdb_printf(fmt, ap);
va_end(ap);
return r;
}
EXPORT_SYMBOL_GPL(kdb_printf);