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-rw-r--r--kernel/debug/kdb/kdb_bp.c6
-rw-r--r--kernel/debug/kdb/kdb_bt.c2
-rw-r--r--kernel/debug/kdb/kdb_io.c157
-rw-r--r--kernel/debug/kdb/kdb_keyboard.c33
-rw-r--r--kernel/debug/kdb/kdb_main.c89
-rw-r--r--kernel/debug/kdb/kdb_private.h2
-rw-r--r--kernel/debug/kdb/kdb_support.c24
7 files changed, 134 insertions, 179 deletions
diff --git a/kernel/debug/kdb/kdb_bp.c b/kernel/debug/kdb/kdb_bp.c
index 372025cf1ca3..c0c2072f5452 100644
--- a/kernel/debug/kdb/kdb_bp.c
+++ b/kernel/debug/kdb/kdb_bp.c
@@ -460,13 +460,15 @@ static int kdb_bc(int argc, const char **argv)
break;
case KDBCMD_BE:
+ if (bp->bp_enabled)
+ break;
+
bp->bp_enabled = 1;
kdb_printf("Breakpoint %d at "
- kdb_bfd_vma_fmt " enabled",
+ kdb_bfd_vma_fmt " enabled\n",
i, bp->bp_addr);
- kdb_printf("\n");
break;
case KDBCMD_BD:
if (!bp->bp_enabled)
diff --git a/kernel/debug/kdb/kdb_bt.c b/kernel/debug/kdb/kdb_bt.c
index 10b454554ab0..137ba73f56fc 100644
--- a/kernel/debug/kdb/kdb_bt.c
+++ b/kernel/debug/kdb/kdb_bt.c
@@ -144,7 +144,7 @@ kdb_bt(int argc, const char **argv)
kdb_ps_suppressed();
/* Run the active tasks first */
for_each_online_cpu(cpu) {
- p = kdb_curr_task(cpu);
+ p = curr_task(cpu);
if (kdb_bt1(p, mask, btaprompt))
return 0;
}
diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index 9443bc63c5a2..6a77f1c779c4 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -184,6 +184,33 @@ char kdb_getchar(void)
unreachable();
}
+/**
+ * kdb_position_cursor() - Place cursor in the correct horizontal position
+ * @prompt: Nil-terminated string containing the prompt string
+ * @buffer: Nil-terminated string containing the entire command line
+ * @cp: Cursor position, pointer the character in buffer where the cursor
+ * should be positioned.
+ *
+ * The cursor is positioned by sending a carriage-return and then printing
+ * the content of the line until we reach the correct cursor position.
+ *
+ * There is some additional fine detail here.
+ *
+ * Firstly, even though kdb_printf() will correctly format zero-width fields
+ * we want the second call to kdb_printf() to be conditional. That keeps things
+ * a little cleaner when LOGGING=1.
+ *
+ * Secondly, we can't combine everything into one call to kdb_printf() since
+ * that renders into a fixed length buffer and the combined print could result
+ * in unwanted truncation.
+ */
+static void kdb_position_cursor(char *prompt, char *buffer, char *cp)
+{
+ kdb_printf("\r%s", prompt);
+ if (cp > buffer)
+ kdb_printf("%.*s", (int)(cp - buffer), buffer);
+}
+
/*
* kdb_read
*
@@ -220,8 +247,7 @@ static char *kdb_read(char *buffer, size_t bufsize)
int count;
int i;
int diag, dtab_count;
- int key, buf_size, ret;
-
+ int key, ret;
diag = kdbgetintenv("DTABCOUNT", &dtab_count);
if (diag)
@@ -243,18 +269,11 @@ poll_again:
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;
+ memmove(cp-1, cp, lastchar - cp + 1);
+ lastchar--;
+ cp--;
+ kdb_printf("\b%s ", cp);
+ kdb_position_cursor(kdb_prompt_str, buffer, cp);
}
break;
case 10: /* linefeed */
@@ -269,22 +288,16 @@ poll_again:
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;
+ memmove(cp, cp+1, lastchar - cp);
+ lastchar--;
+ kdb_printf("%s ", cp);
+ kdb_position_cursor(kdb_prompt_str, buffer, cp);
}
break;
case 1: /* Home */
if (cp > buffer) {
- kdb_printf("\r");
- kdb_printf(kdb_prompt_str);
cp = buffer;
+ kdb_position_cursor(kdb_prompt_str, buffer, cp);
}
break;
case 5: /* End */
@@ -300,11 +313,10 @@ poll_again:
}
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);
+ case 16: /* Up */
+ kdb_printf("\r%*c\r",
+ (int)(strlen(kdb_prompt_str) + (lastchar - buffer)),
+ ' ');
*lastchar = (char)key;
*(lastchar+1) = '\0';
return lastchar;
@@ -314,33 +326,19 @@ poll_again:
++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);
+
+ tmp = *cp;
+ *cp = '\0';
+ p_tmp = strrchr(buffer, ' ');
+ p_tmp = (p_tmp ? p_tmp + 1 : buffer);
+ strscpy(tmpbuffer, p_tmp, sizeof(tmpbuffer));
+ *cp = tmp;
+
+ len = strlen(tmpbuffer);
+ count = kallsyms_symbol_complete(tmpbuffer, sizeof(tmpbuffer));
if (tab == 2 && count > 0) {
kdb_printf("\n%d symbols are found.", count);
if (count > dtab_count) {
@@ -352,46 +350,51 @@ poll_again:
}
kdb_printf("\n");
for (i = 0; i < count; i++) {
- ret = kallsyms_symbol_next(p_tmp, i, buf_size);
+ ret = kallsyms_symbol_next(tmpbuffer, i, sizeof(tmpbuffer));
if (WARN_ON(!ret))
break;
if (ret != -E2BIG)
- kdb_printf("%s ", p_tmp);
+ kdb_printf("%s ", tmpbuffer);
else
- kdb_printf("%s... ", p_tmp);
- *(p_tmp + len) = '\0';
+ kdb_printf("%s... ", tmpbuffer);
+ tmpbuffer[len] = '\0';
}
if (i >= dtab_count)
kdb_printf("...");
kdb_printf("\n");
- kdb_printf(kdb_prompt_str);
+ kdb_printf("%s", kdb_prompt_str);
kdb_printf("%s", buffer);
+ if (cp != lastchar)
+ kdb_position_cursor(kdb_prompt_str, buffer, cp);
} 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;
+ /* How many new characters do we want from tmpbuffer? */
+ len_tmp = strlen(tmpbuffer) - len;
+ if (lastchar + len_tmp >= bufend)
+ len_tmp = bufend - lastchar;
+
+ if (len_tmp) {
+ /* + 1 ensures the '\0' is memmove'd */
+ memmove(cp+len_tmp, cp, (lastchar-cp) + 1);
+ memcpy(cp, tmpbuffer+len, len_tmp);
+ kdb_printf("%s", cp);
+ cp += len_tmp;
+ lastchar += len_tmp;
+ if (cp != lastchar)
+ kdb_position_cursor(kdb_prompt_str,
+ buffer, cp);
+ }
}
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';
+ memmove(cp+1, cp, lastchar - cp + 1);
+ lastchar++;
*cp = key;
- kdb_printf("%s\r", cp);
+ kdb_printf("%s", cp);
++cp;
- tmp = *cp;
- *cp = '\0';
- kdb_printf(kdb_prompt_str);
- kdb_printf("%s", buffer);
- *cp = tmp;
+ kdb_position_cursor(kdb_prompt_str, buffer, cp);
} else {
*++lastchar = '\0';
*cp++ = key;
@@ -450,7 +453,7 @@ 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_printf("%s", kdb_prompt_str);
kdb_nextline = 1; /* Prompt and input resets line number */
return kdb_read(buffer, bufsize);
}
diff --git a/kernel/debug/kdb/kdb_keyboard.c b/kernel/debug/kdb/kdb_keyboard.c
index 3c2987f46f6e..3a74604fdb8a 100644
--- a/kernel/debug/kdb/kdb_keyboard.c
+++ b/kernel/debug/kdb/kdb_keyboard.c
@@ -25,6 +25,8 @@
#define KBD_STAT_OBF 0x01 /* Keyboard output buffer full */
#define KBD_STAT_MOUSE_OBF 0x20 /* Mouse output buffer full */
+#define CTRL(c) ((c) - 64)
+
static int kbd_exists;
static int kbd_last_ret;
@@ -123,24 +125,24 @@ int kdb_get_kbd_char(void)
return 8;
}
- /* Special Key */
+ /* Translate special keys to equivalent CTRL control characters */
switch (scancode) {
case 0xF: /* Tab */
- return 9;
+ return CTRL('I');
case 0x53: /* Del */
- return 4;
+ return CTRL('D');
case 0x47: /* Home */
- return 1;
+ return CTRL('A');
case 0x4F: /* End */
- return 5;
+ return CTRL('E');
case 0x4B: /* Left */
- return 2;
+ return CTRL('B');
case 0x48: /* Up */
- return 16;
+ return CTRL('P');
case 0x50: /* Down */
- return 14;
+ return CTRL('N');
case 0x4D: /* Right */
- return 6;
+ return CTRL('F');
}
if (scancode == 0xe0)
@@ -172,6 +174,19 @@ int kdb_get_kbd_char(void)
switch (KTYP(keychar)) {
case KT_LETTER:
case KT_LATIN:
+ switch (keychar) {
+ /* non-printable supported control characters */
+ case CTRL('A'): /* Home */
+ case CTRL('B'): /* Left */
+ case CTRL('D'): /* Del */
+ case CTRL('E'): /* End */
+ case CTRL('F'): /* Right */
+ case CTRL('I'): /* Tab */
+ case CTRL('N'): /* Down */
+ case CTRL('P'): /* Up */
+ return keychar;
+ }
+
if (isprint(keychar))
break; /* printable characters */
fallthrough;
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index d05066cb40b2..5f4be507d79f 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -155,16 +155,6 @@ static char *__env[31] = {
static const int __nenv = ARRAY_SIZE(__env);
-struct task_struct *kdb_curr_task(int cpu)
-{
- struct task_struct *p = curr_task(cpu);
-#ifdef _TIF_MCA_INIT
- if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
- p = krp->p;
-#endif
- return p;
-}
-
/*
* Update the permissions flags (kdb_cmd_enabled) to match the
* current lockdown state.
@@ -316,8 +306,8 @@ static int kdbgetulenv(const char *match, unsigned long *value)
return KDB_NOTENV;
if (strlen(ep) == 0)
return KDB_NOENVVALUE;
-
- *value = simple_strtoul(ep, NULL, 0);
+ if (kstrtoul(ep, 0, value))
+ return KDB_BADINT;
return 0;
}
@@ -412,42 +402,15 @@ static void kdb_printenv(void)
*/
int kdbgetularg(const char *arg, unsigned long *value)
{
- char *endp;
- unsigned long val;
-
- val = simple_strtoul(arg, &endp, 0);
-
- if (endp == arg) {
- /*
- * Also try base 16, for us folks too lazy to type the
- * leading 0x...
- */
- val = simple_strtoul(arg, &endp, 16);
- if (endp == arg)
- return KDB_BADINT;
- }
-
- *value = val;
-
+ if (kstrtoul(arg, 0, value))
+ return KDB_BADINT;
return 0;
}
int kdbgetu64arg(const char *arg, u64 *value)
{
- char *endp;
- u64 val;
-
- val = simple_strtoull(arg, &endp, 0);
-
- if (endp == arg) {
-
- val = simple_strtoull(arg, &endp, 16);
- if (endp == arg)
- return KDB_BADINT;
- }
-
- *value = val;
-
+ if (kstrtou64(arg, 0, value))
+ return KDB_BADINT;
return 0;
}
@@ -483,10 +446,10 @@ int kdb_set(int argc, const char **argv)
*/
if (strcmp(argv[1], "KDBDEBUG") == 0) {
unsigned int debugflags;
- char *cp;
+ int ret;
- debugflags = simple_strtoul(argv[2], &cp, 0);
- if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
+ ret = kstrtouint(argv[2], 0, &debugflags);
+ if (ret || debugflags & ~KDB_DEBUG_FLAG_MASK) {
kdb_printf("kdb: illegal debug flags '%s'\n",
argv[2]);
return 0;
@@ -1228,7 +1191,7 @@ static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
char *cmdbuf;
int diag;
struct task_struct *kdb_current =
- kdb_curr_task(raw_smp_processor_id());
+ curr_task(raw_smp_processor_id());
KDB_DEBUG_STATE("kdb_local 1", reason);
@@ -1629,10 +1592,10 @@ static int kdb_md(int argc, const char **argv)
if (!argv[0][3])
valid = 1;
else if (argv[0][3] == 'c' && argv[0][4]) {
- char *p;
- repeat = simple_strtoul(argv[0] + 4, &p, 10);
+ if (kstrtouint(argv[0] + 4, 10, &repeat))
+ return KDB_BADINT;
mdcount = ((repeat * bytesperword) + 15) / 16;
- valid = !*p;
+ valid = 1;
}
last_repeat = repeat;
} else if (strcmp(argv[0], "md") == 0)
@@ -2093,15 +2056,10 @@ static int kdb_dmesg(int argc, const char **argv)
if (argc > 2)
return KDB_ARGCOUNT;
if (argc) {
- char *cp;
- lines = simple_strtol(argv[1], &cp, 0);
- if (*cp)
+ if (kstrtoint(argv[1], 0, &lines))
lines = 0;
- if (argc > 1) {
- adjust = simple_strtoul(argv[2], &cp, 0);
- if (*cp || adjust < 0)
- adjust = 0;
- }
+ if (argc > 1 && (kstrtoint(argv[2], 0, &adjust) || adjust < 0))
+ adjust = 0;
}
/* disable LOGGING if set */
@@ -2278,7 +2236,7 @@ void kdb_ps_suppressed(void)
unsigned long cpu;
const struct task_struct *p, *g;
for_each_online_cpu(cpu) {
- p = kdb_curr_task(cpu);
+ p = curr_task(cpu);
if (kdb_task_state(p, "-"))
++idle;
}
@@ -2314,7 +2272,7 @@ void kdb_ps1(const struct task_struct *p)
kdb_task_has_cpu(p), kdb_process_cpu(p),
kdb_task_state_char(p),
(void *)(&p->thread),
- p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
+ p == curr_task(raw_smp_processor_id()) ? '*' : ' ',
p->comm);
if (kdb_task_has_cpu(p)) {
if (!KDB_TSK(cpu)) {
@@ -2350,7 +2308,7 @@ static int kdb_ps(int argc, const char **argv)
for_each_online_cpu(cpu) {
if (KDB_FLAG(CMD_INTERRUPT))
return 0;
- p = kdb_curr_task(cpu);
+ p = curr_task(cpu);
if (kdb_task_state(p, mask))
kdb_ps1(p);
}
@@ -2438,14 +2396,12 @@ static int kdb_help(int argc, const char **argv)
static int kdb_kill(int argc, const char **argv)
{
long sig, pid;
- char *endp;
struct task_struct *p;
if (argc != 2)
return KDB_ARGCOUNT;
- sig = simple_strtol(argv[1], &endp, 0);
- if (*endp)
+ if (kstrtol(argv[1], 0, &sig))
return KDB_BADINT;
if ((sig >= 0) || !valid_signal(-sig)) {
kdb_printf("Invalid signal parameter.<-signal>\n");
@@ -2453,8 +2409,7 @@ static int kdb_kill(int argc, const char **argv)
}
sig = -sig;
- pid = simple_strtol(argv[2], &endp, 0);
- if (*endp)
+ if (kstrtol(argv[2], 0, &pid))
return KDB_BADINT;
if (pid <= 0) {
kdb_printf("Process ID must be large than 0.\n");
@@ -2517,7 +2472,7 @@ static int kdb_summary(int argc, const char **argv)
if (val.uptime > (24*60*60)) {
int days = val.uptime / (24*60*60);
val.uptime %= (24*60*60);
- kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
+ kdb_printf("%d day%s ", days, str_plural(days));
}
kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
diff --git a/kernel/debug/kdb/kdb_private.h b/kernel/debug/kdb/kdb_private.h
index 548fd4059bf9..d2520d72b1f5 100644
--- a/kernel/debug/kdb/kdb_private.h
+++ b/kernel/debug/kdb/kdb_private.h
@@ -210,8 +210,6 @@ extern void kdb_gdb_state_pass(char *buf);
#define KDB_TSK(cpu) kgdb_info[cpu].task
#define KDB_TSKREGS(cpu) kgdb_info[cpu].debuggerinfo
-extern struct task_struct *kdb_curr_task(int);
-
#define kdb_task_has_cpu(p) (task_curr(p))
#define GFP_KDB (in_dbg_master() ? GFP_ATOMIC : GFP_KERNEL)
diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
index 0a39497140bf..05b137e7dcb9 100644
--- a/kernel/debug/kdb/kdb_support.c
+++ b/kernel/debug/kdb/kdb_support.c
@@ -305,7 +305,7 @@ int kdb_putarea_size(unsigned long addr, void *res, size_t size)
/*
* kdb_getphys - Read data from a physical address. Validate the
- * address is in range, use kmap_atomic() to get data
+ * address is in range, use kmap_local_page() to get data
* similar to kdb_getarea() - but for phys addresses
* Inputs:
* res Pointer to the word to receive the result
@@ -324,9 +324,9 @@ static int kdb_getphys(void *res, unsigned long addr, size_t size)
if (!pfn_valid(pfn))
return 1;
page = pfn_to_page(pfn);
- vaddr = kmap_atomic(page);
+ vaddr = kmap_local_page(page);
memcpy(res, vaddr + (addr & (PAGE_SIZE - 1)), size);
- kunmap_atomic(vaddr);
+ kunmap_local(vaddr);
return 0;
}
@@ -536,21 +536,3 @@ bool kdb_task_state(const struct task_struct *p, const char *mask)
return strchr(mask, state);
}
-
-/* Maintain a small stack of kdb_flags to allow recursion without disturbing
- * the global kdb state.
- */
-
-static int kdb_flags_stack[4], kdb_flags_index;
-
-void kdb_save_flags(void)
-{
- BUG_ON(kdb_flags_index >= ARRAY_SIZE(kdb_flags_stack));
- kdb_flags_stack[kdb_flags_index++] = kdb_flags;
-}
-
-void kdb_restore_flags(void)
-{
- BUG_ON(kdb_flags_index <= 0);
- kdb_flags = kdb_flags_stack[--kdb_flags_index];
-}
generated by cgit (git 2.34.1) at 2025-03-23 06:26:35 +0000