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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb

Browse Source 
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb:
  kgdb,ppc: Individual register get/set for ppc
  kgdbts: prevent re-entry to kgdbts before it unregisters
  debug_core,x86,blackfin: Clean up hw debug disable API
  kdb: Fix early debugging crash regression
  kgdb,arm: fix register dump
  kdb: fix per_cpu command to remove supress mask
  kdb: Add kdb kernel module sample
This commit is contained in:
Linus Torvalds 2010-10-29 11:49:38 -07:00
commit 1e431a9d64
15 changed files with 238 additions and 146 deletions
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13
Documentation/DocBook/kgdb.tmpl
View File

@ -710,7 +710,18 @@ Task Addr Pid Parent [*] cpu State Thread Command
<listitem><para>A simple shell</para></listitem>
<listitem><para>The kdb core command set</para></listitem>
<listitem><para>A registration API to register additional kdb shell commands.</para>
<para>A good example of a self-contained kdb module is the "ftdump" command for dumping the ftrace buffer. See: kernel/trace/trace_kdb.c</para></listitem>
<itemizedlist>
<listitem><para>A good example of a self-contained kdb module
is the "ftdump" command for dumping the ftrace buffer. See:
kernel/trace/trace_kdb.c</para></listitem>
<listitem><para>For an example of how to dynamically register
a new kdb command you can build the kdb_hello.ko kernel module
from samples/kdb/kdb_hello.c. To build this example you can
set CONFIG_SAMPLES=y and CONFIG_SAMPLE_KDB=m in your kernel
config. Later run "modprobe kdb_hello" and the next time you
enter the kdb shell, you can run the "hello"
command.</para></listitem>
</itemizedlist></listitem>
<listitem><para>The implementation for kdb_printf() which
emits messages directly to I/O drivers, bypassing the kernel
log.</para></listitem>

5
arch/arm/include/asm/kgdb.h
View File

@ -70,7 +70,8 @@ extern int kgdb_fault_expected;
#define _GP_REGS 16
#define _FP_REGS 8
#define _EXTRA_REGS 2
#define DBG_MAX_REG_NUM (_GP_REGS + (_FP_REGS * 3) + _EXTRA_REGS)
#define GDB_MAX_REGS (_GP_REGS + (_FP_REGS * 3) + _EXTRA_REGS)
#define DBG_MAX_REG_NUM (_GP_REGS + _FP_REGS + _EXTRA_REGS)
#define KGDB_MAX_NO_CPUS 1
#define BUFMAX 400
@ -93,7 +94,7 @@ extern int kgdb_fault_expected;
#define _SPT 13
#define _LR 14
#define _PC 15
#define _CPSR (DBG_MAX_REG_NUM - 1)
#define _CPSR (GDB_MAX_REGS - 1)
/*
* So that we can denote the end of a frame for tracing,

2
arch/arm/kernel/kgdb.c
View File

@ -79,7 +79,7 @@ sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task)
return;
/* Initialize to zero */
for (regno = 0; regno < DBG_MAX_REG_NUM; regno++)
for (regno = 0; regno < GDB_MAX_REGS; regno++)
gdb_regs[regno] = 0;
/* Otherwise, we have only some registers from switch_to() */

3
arch/blackfin/kernel/kgdb.c
View File

@ -320,7 +320,7 @@ static void bfin_correct_hw_break(void)
}
}
void kgdb_disable_hw_debug(struct pt_regs *regs)
static void bfin_disable_hw_debug(struct pt_regs *regs)
{
/* Disable hardware debugging while we are in kgdb */
bfin_write_WPIACTL(0);
@ -406,6 +406,7 @@ struct kgdb_arch arch_kgdb_ops = {
#endif
.set_hw_breakpoint = bfin_set_hw_break,
.remove_hw_breakpoint = bfin_remove_hw_break,
.disable_hw_break = bfin_disable_hw_debug,
.remove_all_hw_break = bfin_remove_all_hw_break,
.correct_hw_break = bfin_correct_hw_break,
};

1
arch/powerpc/include/asm/kgdb.h
View File

@ -31,6 +31,7 @@ static inline void arch_kgdb_breakpoint(void)
asm(".long 0x7d821008"); /* twge r2, r2 */
}
#define CACHE_FLUSH_IS_SAFE 1
#define DBG_MAX_REG_NUM 70
/* The number bytes of registers we have to save depends on a few
* things. For 64bit we default to not including vector registers and

194
arch/powerpc/kernel/kgdb.c
View File

@ -194,40 +194,6 @@ static int kgdb_dabr_match(struct pt_regs *regs)
ptr = (unsigned long *)ptr32; \
} while (0)
void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
unsigned long *ptr = gdb_regs;
int reg;
memset(gdb_regs, 0, NUMREGBYTES);
for (reg = 0; reg < 32; reg++)
PACK64(ptr, regs->gpr[reg]);
#ifdef CONFIG_FSL_BOOKE
#ifdef CONFIG_SPE
for (reg = 0; reg < 32; reg++)
PACK64(ptr, current->thread.evr[reg]);
#else
ptr += 32;
#endif
#else
/* fp registers not used by kernel, leave zero */
ptr += 32 * 8 / sizeof(long);
#endif
PACK64(ptr, regs->nip);
PACK64(ptr, regs->msr);
PACK32(ptr, regs->ccr);
PACK64(ptr, regs->link);
PACK64(ptr, regs->ctr);
PACK32(ptr, regs->xer);
BUG_ON((unsigned long)ptr >
(unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
}
void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
{
struct pt_regs *regs = (struct pt_regs *)(p->thread.ksp +
@ -271,44 +237,140 @@ void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
(unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
}
#define UNPACK64(dest, ptr) do { dest = *(ptr++); } while (0)
#define UNPACK32(dest, ptr) do { \
u32 *ptr32; \
ptr32 = (u32 *)ptr; \
dest = *(ptr32++); \
ptr = (unsigned long *)ptr32; \
} while (0)
void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
unsigned long *ptr = gdb_regs;
int reg;
for (reg = 0; reg < 32; reg++)
UNPACK64(regs->gpr[reg], ptr);
#define GDB_SIZEOF_REG sizeof(unsigned long)
#define GDB_SIZEOF_REG_U32 sizeof(u32)
#ifdef CONFIG_FSL_BOOKE
#ifdef CONFIG_SPE
for (reg = 0; reg < 32; reg++)
UNPACK64(current->thread.evr[reg], ptr);
#define GDB_SIZEOF_FLOAT_REG sizeof(unsigned long)
#else
ptr += 32;
#endif
#else
/* fp registers not used by kernel, leave zero */
ptr += 32 * 8 / sizeof(int);
#define GDB_SIZEOF_FLOAT_REG sizeof(u64)
#endif
UNPACK64(regs->nip, ptr);
UNPACK64(regs->msr, ptr);
UNPACK32(regs->ccr, ptr);
UNPACK64(regs->link, ptr);
UNPACK64(regs->ctr, ptr);
UNPACK32(regs->xer, ptr);
struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
{
{ "r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[0]) },
{ "r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[1]) },
{ "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[2]) },
{ "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[3]) },
{ "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[4]) },
{ "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[5]) },
{ "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[6]) },
{ "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[7]) },
{ "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[8]) },
{ "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[9]) },
{ "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[10]) },
{ "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[11]) },
{ "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[12]) },
{ "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[13]) },
{ "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[14]) },
{ "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[15]) },
{ "r16", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[16]) },
{ "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[17]) },
{ "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[18]) },
{ "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[19]) },
{ "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[20]) },
{ "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[21]) },
{ "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[22]) },
{ "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[23]) },
{ "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[24]) },
{ "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[25]) },
{ "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[26]) },
{ "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[27]) },
{ "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[28]) },
{ "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[29]) },
{ "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[30]) },
{ "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[31]) },
BUG_ON((unsigned long)ptr >
(unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
{ "f0", GDB_SIZEOF_FLOAT_REG, 0 },
{ "f1", GDB_SIZEOF_FLOAT_REG, 1 },
{ "f2", GDB_SIZEOF_FLOAT_REG, 2 },
{ "f3", GDB_SIZEOF_FLOAT_REG, 3 },
{ "f4", GDB_SIZEOF_FLOAT_REG, 4 },
{ "f5", GDB_SIZEOF_FLOAT_REG, 5 },
{ "f6", GDB_SIZEOF_FLOAT_REG, 6 },
{ "f7", GDB_SIZEOF_FLOAT_REG, 7 },
{ "f8", GDB_SIZEOF_FLOAT_REG, 8 },
{ "f9", GDB_SIZEOF_FLOAT_REG, 9 },
{ "f10", GDB_SIZEOF_FLOAT_REG, 10 },
{ "f11", GDB_SIZEOF_FLOAT_REG, 11 },
{ "f12", GDB_SIZEOF_FLOAT_REG, 12 },
{ "f13", GDB_SIZEOF_FLOAT_REG, 13 },
{ "f14", GDB_SIZEOF_FLOAT_REG, 14 },
{ "f15", GDB_SIZEOF_FLOAT_REG, 15 },
{ "f16", GDB_SIZEOF_FLOAT_REG, 16 },
{ "f17", GDB_SIZEOF_FLOAT_REG, 17 },
{ "f18", GDB_SIZEOF_FLOAT_REG, 18 },
{ "f19", GDB_SIZEOF_FLOAT_REG, 19 },
{ "f20", GDB_SIZEOF_FLOAT_REG, 20 },
{ "f21", GDB_SIZEOF_FLOAT_REG, 21 },
{ "f22", GDB_SIZEOF_FLOAT_REG, 22 },
{ "f23", GDB_SIZEOF_FLOAT_REG, 23 },
{ "f24", GDB_SIZEOF_FLOAT_REG, 24 },
{ "f25", GDB_SIZEOF_FLOAT_REG, 25 },
{ "f26", GDB_SIZEOF_FLOAT_REG, 26 },
{ "f27", GDB_SIZEOF_FLOAT_REG, 27 },
{ "f28", GDB_SIZEOF_FLOAT_REG, 28 },
{ "f29", GDB_SIZEOF_FLOAT_REG, 29 },
{ "f30", GDB_SIZEOF_FLOAT_REG, 30 },
{ "f31", GDB_SIZEOF_FLOAT_REG, 31 },
{ "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, nip) },
{ "msr", GDB_SIZEOF_REG, offsetof(struct pt_regs, msr) },
{ "cr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ccr) },
{ "lr", GDB_SIZEOF_REG, offsetof(struct pt_regs, link) },
{ "ctr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ctr) },
{ "xer", GDB_SIZEOF_REG, offsetof(struct pt_regs, xer) },
};
char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
{
if (regno >= DBG_MAX_REG_NUM || regno < 0)
return NULL;
if (regno < 32 || regno >= 64)
/* First 0 -> 31 gpr registers*/
/* pc, msr, ls... registers 64 -> 69 */
memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
dbg_reg_def[regno].size);
if (regno >= 32 && regno < 64) {
/* FP registers 32 -> 63 */
#if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
if (current)
memcpy(mem, current->thread.evr[regno-32],
dbg_reg_def[regno].size);
#else
/* fp registers not used by kernel, leave zero */
memset(mem, 0, dbg_reg_def[regno].size);
#endif
}
return dbg_reg_def[regno].name;
}
int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
{
if (regno >= DBG_MAX_REG_NUM || regno < 0)
return -EINVAL;
if (regno < 32 || regno >= 64)
/* First 0 -> 31 gpr registers*/
/* pc, msr, ls... registers 64 -> 69 */
memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
dbg_reg_def[regno].size);
if (regno >= 32 && regno < 64) {
/* FP registers 32 -> 63 */
#if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
memcpy(current->thread.evr[regno-32], mem,
dbg_reg_def[regno].size);
#else
/* fp registers not used by kernel, leave zero */
return 0;
#endif
}
return 0;
}
void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)

3
arch/x86/kernel/kgdb.c
View File

@ -387,7 +387,7 @@ kgdb_set_hw_break(unsigned long addr, int len, enum kgdb_bptype bptype)
* disable hardware debugging while it is processing gdb packets or
* handling exception.
*/
void kgdb_disable_hw_debug(struct pt_regs *regs)
static void kgdb_disable_hw_debug(struct pt_regs *regs)
{
int i;
int cpu = raw_smp_processor_id();
@ -724,6 +724,7 @@ struct kgdb_arch arch_kgdb_ops = {
.flags = KGDB_HW_BREAKPOINT,
.set_hw_breakpoint = kgdb_set_hw_break,
.remove_hw_breakpoint = kgdb_remove_hw_break,
.disable_hw_break = kgdb_disable_hw_debug,
.remove_all_hw_break = kgdb_remove_all_hw_break,
.correct_hw_break = kgdb_correct_hw_break,
};

16
drivers/misc/kgdbts.c
View File

@ -1044,12 +1044,6 @@ static int __init init_kgdbts(void)
return configure_kgdbts();
}
static void cleanup_kgdbts(void)
{
if (configured == 1)
kgdb_unregister_io_module(&kgdbts_io_ops);
}
static int kgdbts_get_char(void)
{
int val = 0;
@ -1081,10 +1075,8 @@ static int param_set_kgdbts_var(const char *kmessage, struct kernel_param *kp)
return 0;
}
if (kgdb_connected) {
printk(KERN_ERR
"kgdbts: Cannot reconfigure while KGDB is connected.\n");
if (configured == 1) {
printk(KERN_ERR "kgdbts: ERROR: Already configured and running.\n");
return -EBUSY;
}
@ -1093,9 +1085,6 @@ static int param_set_kgdbts_var(const char *kmessage, struct kernel_param *kp)
if (config[len - 1] == '\n')
config[len - 1] = '\0';
if (configured == 1)
cleanup_kgdbts();
/* Go and configure with the new params. */
return configure_kgdbts();
}
@ -1123,7 +1112,6 @@ static struct kgdb_io kgdbts_io_ops = {
};
module_init(init_kgdbts);
module_exit(cleanup_kgdbts);
module_param_call(kgdbts, param_set_kgdbts_var, param_get_string, &kps, 0644);
MODULE_PARM_DESC(kgdbts, "<A|V1|V2>[F#|S#][N#]");
MODULE_DESCRIPTION("KGDB Test Suite");

13
include/linux/kgdb.h
View File

@ -35,16 +35,6 @@ struct pt_regs;
*/
extern int kgdb_skipexception(int exception, struct pt_regs *regs);
/**
* kgdb_disable_hw_debug - (optional) Disable hardware debugging hook
* @regs: Current &struct pt_regs.
*
* This function will be called if the particular architecture must
* disable hardware debugging while it is processing gdb packets or
* handling exception.
*/
extern void kgdb_disable_hw_debug(struct pt_regs *regs);
struct tasklet_struct;
struct task_struct;
struct uart_port;
@ -243,6 +233,8 @@ extern void kgdb_arch_late(void);
* breakpoint.
* @remove_hw_breakpoint: Allow an architecture to specify how to remove a
* hardware breakpoint.
* @disable_hw_break: Allow an architecture to specify how to disable
* hardware breakpoints for a single cpu.
* @remove_all_hw_break: Allow an architecture to specify how to remove all
* hardware breakpoints.
* @correct_hw_break: Allow an architecture to specify how to correct the
@ -256,6 +248,7 @@ struct kgdb_arch {
int (*remove_breakpoint)(unsigned long, char *);
int (*set_hw_breakpoint)(unsigned long, int, enum kgdb_bptype);
int (*remove_hw_breakpoint)(unsigned long, int, enum kgdb_bptype);
void (*disable_hw_break)(struct pt_regs *regs);
void (*remove_all_hw_break)(void);
void (*correct_hw_break)(void);
};

16
kernel/debug/debug_core.c
View File

@ -209,18 +209,6 @@ int __weak kgdb_skipexception(int exception, struct pt_regs *regs)
return 0;
}
/**
* kgdb_disable_hw_debug - Disable hardware debugging while we in kgdb.
* @regs: Current &struct pt_regs.
*
* This function will be called if the particular architecture must
* disable hardware debugging while it is processing gdb packets or
* handling exception.
*/
void __weak kgdb_disable_hw_debug(struct pt_regs *regs)
{
}
/*
* Some architectures need cache flushes when we set/clear a
* breakpoint:
@ -484,7 +472,9 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs,
atomic_inc(&masters_in_kgdb);
else
atomic_inc(&slaves_in_kgdb);
kgdb_disable_hw_debug(ks->linux_regs);
if (arch_kgdb_ops.disable_hw_break)
arch_kgdb_ops.disable_hw_break(regs);
acquirelock:
/*

48
kernel/debug/kdb/kdb_main.c
View File

@ -1127,7 +1127,7 @@ static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
/* special case below */
} else {
kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",
kdb_current, kdb_current->pid);
kdb_current, kdb_current ? kdb_current->pid : 0);
#if defined(CONFIG_SMP)
kdb_printf("on processor %d ", raw_smp_processor_id());
#endif
@ -2603,20 +2603,17 @@ static int kdb_summary(int argc, const char **argv)
*/
static int kdb_per_cpu(int argc, const char **argv)
{
char buf[256], fmtstr[64];
kdb_symtab_t symtab;
cpumask_t suppress = CPU_MASK_NONE;
int cpu, diag;
unsigned long addr, val, bytesperword = 0, whichcpu = ~0UL;
char fmtstr[64];
int cpu, diag, nextarg = 1;
unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
if (argc < 1 || argc > 3)
return KDB_ARGCOUNT;
snprintf(buf, sizeof(buf), "per_cpu__%s", argv[1]);
if (!kdbgetsymval(buf, &symtab)) {
kdb_printf("%s is not a per_cpu variable\n", argv[1]);
return KDB_BADADDR;
}
diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
if (diag)
return diag;
if (argc >= 2) {
diag = kdbgetularg(argv[2], &bytesperword);
if (diag)
@ -2649,46 +2646,25 @@ static int kdb_per_cpu(int argc, const char **argv)
#define KDB_PCU(cpu) 0
#endif
#endif
for_each_online_cpu(cpu) {
if (KDB_FLAG(CMD_INTERRUPT))
return 0;
if (whichcpu != ~0UL && whichcpu != cpu)
continue;
addr = symtab.sym_start + KDB_PCU(cpu);
addr = symaddr + KDB_PCU(cpu);
diag = kdb_getword(&val, addr, bytesperword);
if (diag) {
kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
"read, diag=%d\n", cpu, addr, diag);
continue;
}
#ifdef CONFIG_SMP
if (!val) {
cpu_set(cpu, suppress);
continue;
}
#endif /* CONFIG_SMP */
kdb_printf("%5d ", cpu);
kdb_md_line(fmtstr, addr,
bytesperword == KDB_WORD_SIZE,
1, bytesperword, 1, 1, 0);
}
if (cpus_weight(suppress) == 0)
return 0;
kdb_printf("Zero suppressed cpu(s):");
for (cpu = first_cpu(suppress); cpu < num_possible_cpus();
cpu = next_cpu(cpu, suppress)) {
kdb_printf(" %d", cpu);
if (cpu == num_possible_cpus() - 1 ||
next_cpu(cpu, suppress) != cpu + 1)
continue;
while (cpu < num_possible_cpus() &&
next_cpu(cpu, suppress) == cpu + 1)
++cpu;
kdb_printf("-%d", cpu);
}
kdb_printf("\n");
#undef KDB_PCU
return 0;
}

7
samples/Kconfig
View File

@ -54,4 +54,11 @@ config SAMPLE_KFIFO
If in doubt, say "N" here.
config SAMPLE_KDB
tristate "Build kdb command exmaple -- loadable modules only"
depends on KGDB_KDB && m
help
Build an example of how to dynamically add the hello
command to the kdb shell.
endif # SAMPLES

2
samples/Makefile
View File

@ -1,4 +1,4 @@
# Makefile for Linux samples code
obj-$(CONFIG_SAMPLES) += kobject/ kprobes/ tracepoints/ trace_events/ \
hw_breakpoint/ kfifo/
hw_breakpoint/ kfifo/ kdb/

1
samples/kdb/Makefile Normal file
View File

@ -0,0 +1 @@
obj-$(CONFIG_SAMPLE_KDB) += kdb_hello.o

60
samples/kdb/kdb_hello.c Normal file
View File

@ -0,0 +1,60 @@
/*
* Created by: Jason Wessel <jason.wessel@windriver.com>
*
* Copyright (c) 2010 Wind River Systems, Inc. All Rights Reserved.
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/module.h>
#include <linux/kdb.h>
/*
* All kdb shell command call backs receive argc and argv, where
* argv[0] is the command the end user typed
*/
static int kdb_hello_cmd(int argc, const char **argv)
{
if (argc > 1)
return KDB_ARGCOUNT;
if (argc)
kdb_printf("Hello %s.\n", argv[1]);
else
kdb_printf("Hello world!\n");
return 0;
}
static int __init kdb_hello_cmd_init(void)
{
/*
* Registration of a dynamically added kdb command is done with
* kdb_register() with the arguments being:
* 1: The name of the shell command
* 2: The function that processes the command
* 3: Description of the usage of any arguments
* 4: Descriptive text when you run help
* 5: Number of characters to complete the command
* 0 == type the whole command
* 1 == match both "g" and "go" for example
*/
kdb_register("hello", kdb_hello_cmd, "[string]",
"Say Hello World or Hello [string]", 0);
return 0;
}
static void __exit kdb_hello_cmd_exit(void)
{
kdb_unregister("hello");
}
module_init(kdb_hello_cmd_init);
module_exit(kdb_hello_cmd_exit);
MODULE_AUTHOR("WindRiver");
MODULE_DESCRIPTION("KDB example to add a hello command");
MODULE_LICENSE("GPL");