Move kdb environment related get/set APIs to a separate file in order
to provide an abstraction for environment variables access and hence
enhances code readability.
Signed-off-by: Sumit Garg <sumit.g...@linaro.org>
---
kernel/debug/kdb/Makefile | 2 +-
kernel/debug/kdb/kdb_env.c | 229 +++++++++++++++++++++++++++++++++++++++++
kernel/debug/kdb/kdb_main.c | 201 +-----------------------------------
kernel/debug/kdb/kdb_private.h | 3 +
4 files changed, 235 insertions(+), 200 deletions(-)
create mode 100644 kernel/debug/kdb/kdb_env.c
diff --git a/kernel/debug/kdb/Makefile b/kernel/debug/kdb/Makefile
index efac857..b76aebe 100644
--- a/kernel/debug/kdb/Makefile
+++ b/kernel/debug/kdb/Makefile
@@ -6,7 +6,7 @@
# Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
#
-obj-y := kdb_io.o kdb_main.o kdb_support.o kdb_bt.o gen-kdb_cmds.o kdb_bp.o
kdb_debugger.o
+obj-y := kdb_io.o kdb_main.o kdb_support.o kdb_bt.o gen-kdb_cmds.o kdb_bp.o
kdb_debugger.o kdb_env.o
obj-$(CONFIG_KDB_KEYBOARD) += kdb_keyboard.o
clean-files := gen-kdb_cmds.c
diff --git a/kernel/debug/kdb/kdb_env.c b/kernel/debug/kdb/kdb_env.c
new file mode 100644
index 0000000..33ab5e6
--- /dev/null
+++ b/kernel/debug/kdb/kdb_env.c
@@ -0,0 +1,229 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Kernel Debugger Architecture Independent Environment Functions
+ *
+ * Copyright (c) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
+ * 03/02/13 added new 2.5 kallsyms <xavier....@bull.net>
+ */
+
+#include <linux/kdb.h>
+#include <linux/string.h>
+#include "kdb_private.h"
+
+/*
+ * Initial environment. This is all kept static and local to
+ * this file. We don't want to rely on the memory allocation
+ * mechanisms in the kernel, so we use a very limited allocate-only
+ * heap for new and altered environment variables. The entire
+ * environment is limited to a fixed number of entries (add more
+ * to __env[] if required) and a fixed amount of heap (add more to
+ * KDB_ENVBUFSIZE if required).
+ */
+static char *__env[] = {
+#if defined(CONFIG_SMP)
+ "PROMPT=[%d]kdb> ",
+#else
+ "PROMPT=kdb> ",
+#endif
+ "MOREPROMPT=more> ",
+ "RADIX=16",
+ "MDCOUNT=8", /* lines of md output */
+ KDB_PLATFORM_ENV,
+ "DTABCOUNT=30",
+ "NOSECT=1",
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+};
+
+static const int __nenv = ARRAY_SIZE(__env);
+
+/*
+ * kdbgetenv - This function will return the character string value of
+ * an environment variable.
+ * Parameters:
+ * match A character string representing an environment variable.
+ * Returns:
+ * NULL No environment variable matches 'match'
+ * char* Pointer to string value of environment variable.
+ */
+char *kdbgetenv(const char *match)
+{
+ char **ep = __env;
+ int matchlen = strlen(match);
+ int i;
+
+ for (i = 0; i < __nenv; i++) {
+ char *e = *ep++;
+
+ if (!e)
+ continue;
+
+ if ((strncmp(match, e, matchlen) == 0)
+ && ((e[matchlen] == '\0')
+ || (e[matchlen] == '='))) {
+ char *cp = strchr(e, '=');
+
+ return cp ? ++cp : "";
+ }
+ }
+ return NULL;
+}
+
+/*
+ * kdballocenv - This function is used to allocate bytes for
+ * environment entries.
+ * Parameters:
+ * match A character string representing a numeric value
+ * Outputs:
+ * *value the unsigned long representation of the env variable 'match'
+ * Returns:
+ * Zero on success, a kdb diagnostic on failure.
+ * Remarks:
+ * We use a static environment buffer (envbuffer) to hold the values
+ * of dynamically generated environment variables (see kdb_set). Buffer
+ * space once allocated is never free'd, so over time, the amount of space
+ * (currently 512 bytes) will be exhausted if env variables are changed
+ * frequently.
+ */
+static char *kdballocenv(size_t bytes)
+{
+#define KDB_ENVBUFSIZE 512
+ static char envbuffer[KDB_ENVBUFSIZE];
+ static int envbufsize;
+ char *ep = NULL;
+
+ if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
+ ep = &envbuffer[envbufsize];
+ envbufsize += bytes;
+ }
+ return ep;
+}
+
+/*
+ * kdbgetulenv - This function will return the value of an unsigned
+ * long-valued environment variable.
+ * Parameters:
+ * match A character string representing a numeric value
+ * Outputs:
+ * *value the unsigned long represntation of the env variable 'match'
+ * Returns:
+ * Zero on success, a kdb diagnostic on failure.
+ */
+int kdbgetulenv(const char *match, unsigned long *value)
+{
+ char *ep;
+
+ ep = kdbgetenv(match);
+ if (!ep)
+ return KDB_NOTENV;
+ if (strlen(ep) == 0)
+ return KDB_NOENVVALUE;
+
+ *value = simple_strtoul(ep, NULL, 0);
+
+ return 0;
+}
+
+/*
+ * kdbgetintenv - This function will return the value of an
+ * integer-valued environment variable.
+ * Parameters:
+ * match A character string representing an integer-valued env variable
+ * Outputs:
+ * *value the integer representation of the environment variable 'match'
+ * Returns:
+ * Zero on success, a kdb diagnostic on failure.
+ */
+int kdbgetintenv(const char *match, int *value)
+{
+ unsigned long val;
+ int diag;
+
+ diag = kdbgetulenv(match, &val);
+ if (!diag)
+ *value = (int) val;
+ return diag;
+}
+
+/*
+ * kdb_setenv - Alter an existing environment variable or create a new one.
+ * Parameters:
+ * var name of the variable
+ * val value of the variable
+ * Returns:
+ * Zero on success, a kdb diagnostic on failure.
+ */
+int kdb_setenv(const char *var, const char *val)
+{
+ int i;
+ char *ep;
+ size_t varlen, vallen;
+
+ varlen = strlen(var);
+ vallen = strlen(val);
+ ep = kdballocenv(varlen + vallen + 2);
+ if (ep == (char *)0)
+ return KDB_ENVBUFFULL;
+
+ sprintf(ep, "%s=%s", var, val);
+
+ ep[varlen+vallen+1] = '\0';
+
+ for (i = 0; i < __nenv; i++) {
+ if (__env[i]
+ && ((strncmp(__env[i], var, varlen) == 0)
+ && ((__env[i][varlen] == '\0')
+ || (__env[i][varlen] == '=')))) {
+ __env[i] = ep;
+ return 0;
+ }
+ }
+
+ /*
+ * Wasn't existing variable. Fit into slot.
+ */
+ for (i = 0; i < __nenv-1; i++) {
+ if (__env[i] == (char *)0) {
+ __env[i] = ep;
+ return 0;
+ }
+ }
+
+ return KDB_ENVFULL;
+}
+
+/*
+ * kdb_prienv - Display the current environment variables.
+ */
+void kdb_prienv(void)
+{
+ int i;
+
+ for (i = 0; i < __nenv; i++) {
+ if (__env[i])
+ kdb_printf("%s\n", __env[i]);
+ }
+}
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index a0989a0..03ba161 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -129,57 +129,6 @@ static kdbmsg_t kdbmsgs[] = {
static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);
-
-/*
- * Initial environment. This is all kept static and local to
- * this file. We don't want to rely on the memory allocation
- * mechanisms in the kernel, so we use a very limited allocate-only
- * heap for new and altered environment variables. The entire
- * environment is limited to a fixed number of entries (add more
- * to __env[] if required) and a fixed amount of heap (add more to
- * KDB_ENVBUFSIZE if required).
- */
-
-static char *__env[] = {
-#if defined(CONFIG_SMP)
- "PROMPT=[%d]kdb> ",
-#else
- "PROMPT=kdb> ",
-#endif
- "MOREPROMPT=more> ",
- "RADIX=16",
- "MDCOUNT=8", /* lines of md output */
- KDB_PLATFORM_ENV,
- "DTABCOUNT=30",
- "NOSECT=1",
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
- (char *)0,
-};
-
-static const int __nenv = ARRAY_SIZE(__env);
-
struct task_struct *kdb_curr_task(int cpu)
{
struct task_struct *p = curr_task(cpu);
@@ -211,113 +160,6 @@ static inline bool kdb_check_flags(kdb_cmdflags_t flags,
int permissions,
}
/*
- * kdbgetenv - This function will return the character string value of
- * an environment variable.
- * Parameters:
- * match A character string representing an environment variable.
- * Returns:
- * NULL No environment variable matches 'match'
- * char* Pointer to string value of environment variable.
- */
-char *kdbgetenv(const char *match)
-{
- char **ep = __env;
- int matchlen = strlen(match);
- int i;
-
- for (i = 0; i < __nenv; i++) {
- char *e = *ep++;
-
- if (!e)
- continue;
-
- if ((strncmp(match, e, matchlen) == 0)
- && ((e[matchlen] == '\0')
- || (e[matchlen] == '='))) {
- char *cp = strchr(e, '=');
- return cp ? ++cp : "";
- }
- }
- return NULL;
-}
-
-/*
- * kdballocenv - This function is used to allocate bytes for
- * environment entries.
- * Parameters:
- * match A character string representing a numeric value
- * Outputs:
- * *value the unsigned long representation of the env variable 'match'
- * Returns:
- * Zero on success, a kdb diagnostic on failure.
- * Remarks:
- * We use a static environment buffer (envbuffer) to hold the values
- * of dynamically generated environment variables (see kdb_set). Buffer
- * space once allocated is never free'd, so over time, the amount of space
- * (currently 512 bytes) will be exhausted if env variables are changed
- * frequently.
- */
-static char *kdballocenv(size_t bytes)
-{
-#define KDB_ENVBUFSIZE 512
- static char envbuffer[KDB_ENVBUFSIZE];
- static int envbufsize;
- char *ep = NULL;
-
- if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
- ep = &envbuffer[envbufsize];
- envbufsize += bytes;
- }
- return ep;
-}
-
-/*
- * kdbgetulenv - This function will return the value of an unsigned
- * long-valued environment variable.
- * Parameters:
- * match A character string representing a numeric value
- * Outputs:
- * *value the unsigned long represntation of the env variable 'match'
- * Returns:
- * Zero on success, a kdb diagnostic on failure.
- */
-static int kdbgetulenv(const char *match, unsigned long *value)
-{
- char *ep;
-
- ep = kdbgetenv(match);
- if (!ep)
- return KDB_NOTENV;
- if (strlen(ep) == 0)
- return KDB_NOENVVALUE;
-
- *value = simple_strtoul(ep, NULL, 0);
-
- return 0;
-}
-
-/*
- * kdbgetintenv - This function will return the value of an
- * integer-valued environment variable.
- * Parameters:
- * match A character string representing an integer-valued env variable
- * Outputs:
- * *value the integer representation of the environment variable 'match'
- * Returns:
- * Zero on success, a kdb diagnostic on failure.
- */
-int kdbgetintenv(const char *match, int *value)
-{
- unsigned long val;
- int diag;
-
- diag = kdbgetulenv(match, &val);
- if (!diag)
- *value = (int) val;
- return diag;
-}
-
-/*
* kdbgetularg - This function will convert a numeric string into an
* unsigned long value.
* Parameters:
@@ -374,10 +216,6 @@ int kdbgetu64arg(const char *arg, u64 *value)
*/
int kdb_set(int argc, const char **argv)
{
- int i;
- char *ep;
- size_t varlen, vallen;
-
/*
* we can be invoked two ways:
* set var=value argv[1]="var", argv[2]="value"
@@ -422,37 +260,7 @@ int kdb_set(int argc, const char **argv)
* Tokenizer squashed the '=' sign. argv[1] is variable
* name, argv[2] = value.
*/
- varlen = strlen(argv[1]);
- vallen = strlen(argv[2]);
- ep = kdballocenv(varlen + vallen + 2);
- if (ep == (char *)0)
- return KDB_ENVBUFFULL;
-
- sprintf(ep, "%s=%s", argv[1], argv[2]);
-
- ep[varlen+vallen+1] = '\0';
-
- for (i = 0; i < __nenv; i++) {
- if (__env[i]
- && ((strncmp(__env[i], argv[1], varlen) == 0)
- && ((__env[i][varlen] == '\0')
- || (__env[i][varlen] == '=')))) {
- __env[i] = ep;
- return 0;
- }
- }
-
- /*
- * Wasn't existing variable. Fit into slot.
- */
- for (i = 0; i < __nenv-1; i++) {
- if (__env[i] == (char *)0) {
- __env[i] = ep;
- return 0;
- }
- }
-
- return KDB_ENVFULL;
+ return kdb_setenv(argv[1], argv[2]);
}
static int kdb_check_regs(void)
@@ -2056,12 +1864,7 @@ static int kdb_lsmod(int argc, const char **argv)
static int kdb_env(int argc, const char **argv)
{
- int i;
-
- for (i = 0; i < __nenv; i++) {
- if (__env[i])
- kdb_printf("%s\n", __env[i]);
- }
+ kdb_prienv();
if (KDB_DEBUG(MASK))
kdb_printf("KDBDEBUG=0x%x\n",
diff --git a/kernel/debug/kdb/kdb_private.h b/kernel/debug/kdb/kdb_private.h
index 4b2f79e..ae43a13 100644
--- a/kernel/debug/kdb/kdb_private.h
+++ b/kernel/debug/kdb/kdb_private.h
@@ -105,6 +105,9 @@ extern int kdb_putword(unsigned long, unsigned long,
size_t);
extern int kdbgetularg(const char *, unsigned long *);
extern int kdbgetu64arg(const char *, u64 *);
extern char *kdbgetenv(const char *);
+extern int kdbgetulenv(const char *match, unsigned long *value);
+extern int kdb_setenv(const char *var, const char *val);
+extern void kdb_prienv(void);
extern int kdbgetaddrarg(int, const char **, int*, unsigned long *,
long *, char **);
extern int kdbgetsymval(const char *, kdb_symtab_t *);
--
2.7.4
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