LXR linux/arch/blackfin/kernel/kgdb

   1/*
   2 * arch/blackfin/kernel/kgdb_test.c - Blackfin kgdb tests
   3 *
   4 * Copyright 2005-2008 Analog Devices Inc.
   5 *
   6 * Licensed under the GPL-2 or later.
   7 */
   8
   9#include <linux/module.h>
  10#include <linux/kernel.h>
  11#include <linux/init.h>
  12#include <linux/proc_fs.h>
  13
  14#include <asm/current.h>
  15#include <asm/uaccess.h>
  16#include <asm/system.h>
  17
  18#include <asm/blackfin.h>
  19
  20static char cmdline[256];
  21static unsigned long len;
  22
  23#ifndef CONFIG_SMP
  24static int num1 __attribute__((l1_data));
  25
  26void kgdb_l1_test(void) __attribute__((l1_text));
  27
  28void kgdb_l1_test(void)
  29{
  30        printk(KERN_ALERT "L1(before change) : data variable addr = 0x%p, data value is %d\n", &num1, num1);
  31        printk(KERN_ALERT "L1 : code function addr = 0x%p\n", kgdb_l1_test);
  32        num1 = num1 + 10 ;
  33        printk(KERN_ALERT "L1(after change) : data variable addr = 0x%p, data value is %d\n", &num1, num1);
  34        return ;
  35}
  36#endif
  37
  38#if L2_LENGTH
  39
  40static int num2 __attribute__((l2));
  41void kgdb_l2_test(void) __attribute__((l2));
  42
  43void kgdb_l2_test(void)
  44{
  45        printk(KERN_ALERT "L2(before change) : data variable addr = 0x%p, data value is %d\n", &num2, num2);
  46        printk(KERN_ALERT "L2 : code function addr = 0x%p\n", kgdb_l2_test);
  47        num2 = num2 + 20 ;
  48        printk(KERN_ALERT "L2(after change) : data variable addr = 0x%p, data value is %d\n", &num2, num2);
  49        return ;
  50}
  51
  52#endif
  53
  54
  55int kgdb_test(char *name, int len, int count, int z)
  56{
  57        printk(KERN_ALERT "kgdb name(%d): %s, %d, %d\n", len, name, count, z);
  58        count = z;
  59        return count;
  60}
  61
  62static int test_proc_output(char *buf)
  63{
  64        kgdb_test("hello world!", 12, 0x55, 0x10);
  65#ifndef CONFIG_SMP
  66        kgdb_l1_test();
  67#endif
  68#if L2_LENGTH
  69        kgdb_l2_test();
  70#endif
  71
  72        return 0;
  73}
  74
  75static int test_read_proc(char *page, char **start, off_t off,
  76                                 int count, int *eof, void *data)
  77{
  78        int len;
  79
  80        len = test_proc_output(page);
  81        if (len <= off+count)
  82                *eof = 1;
  83        *start = page + off;
  84        len -= off;
  85        if (len > count)
  86                len = count;
  87        if (len < 0)
  88                len = 0;
  89        return len;
  90}
  91
  92static int test_write_proc(struct file *file, const char *buffer,
  93                                 unsigned long count, void *data)
  94{
  95        if (count >= 256)
  96                len = 255;
  97        else
  98                len = count;
  99
 100        memcpy(cmdline, buffer, count);
 101        cmdline[len] = 0;
 102
 103        return len;
 104}
 105
 106static int __init kgdbtest_init(void)
 107{
 108        struct proc_dir_entry *entry;
 109
 110        entry = create_proc_entry("kgdbtest", 0, NULL);
 111        if (entry == NULL)
 112                return -ENOMEM;
 113
 114        entry->read_proc = test_read_proc;
 115        entry->write_proc = test_write_proc;
 116        entry->data = NULL;
 117
 118        return 0;
 119}
 120
 121static void __exit kgdbtest_exit(void)
 122{
 123        remove_proc_entry("kgdbtest", NULL);
 124}
 125
 126module_init(kgdbtest_init);
 127module_exit(kgdbtest_exit);
 128MODULE_LICENSE("GPL");
 129