kernel/debug/kdb/kdb_private.h

   1 #ifndef _KDBPRIVATE_H
   2 #define _KDBPRIVATE_H
   3
   4 /*
   5  * Kernel Debugger Architecture Independent Private Headers
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file "COPYING" in the main directory of this archive
   9  * for more details.
  10  *
  11  * Copyright (c) 2000-2004 Silicon Graphics, Inc.  All Rights Reserved.
  12  * Copyright (c) 2009 Wind River Systems, Inc.  All Rights Reserved.
  13  */
  14
  15 #include <linux/kgdb.h>
  16 #include "../debug_core.h"
  17
  18 /* Kernel Debugger Command codes.  Must not overlap with error codes. */
  19 #define KDB_CMD_GO      (-1001)
  20 #define KDB_CMD_CPU     (-1002)
  21 #define KDB_CMD_SS      (-1003)
  22 #define KDB_CMD_KGDB (-1005)
  23
  24 /* Internal debug flags */
  25 #define KDB_DEBUG_FLAG_BP       0x0002  /* Breakpoint subsystem debug */
  26 #define KDB_DEBUG_FLAG_BB_SUMM  0x0004  /* Basic block analysis, summary only */
  27 #define KDB_DEBUG_FLAG_AR       0x0008  /* Activation record, generic */
  28 #define KDB_DEBUG_FLAG_ARA      0x0010  /* Activation record, arch specific */
  29 #define KDB_DEBUG_FLAG_BB       0x0020  /* All basic block analysis */
  30 #define KDB_DEBUG_FLAG_STATE    0x0040  /* State flags */
  31 #define KDB_DEBUG_FLAG_MASK     0xffff  /* All debug flags */
  32 #define KDB_DEBUG_FLAG_SHIFT    16      /* Shift factor for dbflags */
  33
  34 #define KDB_DEBUG(flag) (kdb_flags & \
  35         (KDB_DEBUG_FLAG_##flag << KDB_DEBUG_FLAG_SHIFT))
  36 #define KDB_DEBUG_STATE(text, value) if (KDB_DEBUG(STATE)) \
  37                 kdb_print_state(text, value)
  38
  39 #if BITS_PER_LONG == 32
  40
  41 #define KDB_PLATFORM_ENV        "BYTESPERWORD=4"
  42
  43 #define kdb_machreg_fmt         "0x%lx"
  44 #define kdb_machreg_fmt0        "0x%08lx"
  45 #define kdb_bfd_vma_fmt         "0x%lx"
  46 #define kdb_bfd_vma_fmt0        "0x%08lx"
  47 #define kdb_elfw_addr_fmt       "0x%x"
  48 #define kdb_elfw_addr_fmt0      "0x%08x"
  49 #define kdb_f_count_fmt         "%d"
  50
  51 #elif BITS_PER_LONG == 64
  52
  53 #define KDB_PLATFORM_ENV        "BYTESPERWORD=8"
  54
  55 #define kdb_machreg_fmt         "0x%lx"
  56 #define kdb_machreg_fmt0        "0x%016lx"
  57 #define kdb_bfd_vma_fmt         "0x%lx"
  58 #define kdb_bfd_vma_fmt0        "0x%016lx"
  59 #define kdb_elfw_addr_fmt       "0x%x"
  60 #define kdb_elfw_addr_fmt0      "0x%016x"
  61 #define kdb_f_count_fmt         "%ld"
  62
  63 #endif
  64
  65 /*
  66  * KDB_MAXBPT describes the total number of breakpoints
  67  * supported by this architecure.
  68  */
  69 #define KDB_MAXBPT      16
  70
  71 /* Symbol table format returned by kallsyms. */
  72 typedef struct __ksymtab {
  73                 unsigned long value;    /* Address of symbol */
  74                 const char *mod_name;   /* Module containing symbol or
  75                                          * "kernel" */
  76                 unsigned long mod_start;
  77                 unsigned long mod_end;
  78                 const char *sec_name;   /* Section containing symbol */
  79                 unsigned long sec_start;
  80                 unsigned long sec_end;
  81                 const char *sym_name;   /* Full symbol name, including
  82                                          * any version */
  83                 unsigned long sym_start;
  84                 unsigned long sym_end;
  85                 } kdb_symtab_t;
  86 extern int kallsyms_symbol_next(char *prefix_name, int flag);
  87 extern int kallsyms_symbol_complete(char *prefix_name, int max_len);
  88
  89 /* Exported Symbols for kernel loadable modules to use. */
  90 extern int kdb_getarea_size(void *, unsigned long, size_t);
  91 extern int kdb_putarea_size(unsigned long, void *, size_t);
  92
  93 /*
  94  * Like get_user and put_user, kdb_getarea and kdb_putarea take variable
  95  * names, not pointers.  The underlying *_size functions take pointers.
  96  */
  97 #define kdb_getarea(x, addr) kdb_getarea_size(&(x), addr, sizeof((x)))
  98 #define kdb_putarea(addr, x) kdb_putarea_size(addr, &(x), sizeof((x)))
  99
 100 extern int kdb_getphysword(unsigned long *word,
 101                         unsigned long addr, size_t size);
 102 extern int kdb_getword(unsigned long *, unsigned long, size_t);
 103 extern int kdb_putword(unsigned long, unsigned long, size_t);
 104
 105 extern int kdbgetularg(const char *, unsigned long *);
 106 extern int kdbgetu64arg(const char *, u64 *);
 107 extern char *kdbgetenv(const char *);
 108 extern int kdbgetaddrarg(int, const char **, int*, unsigned long *,
 109                          long *, char **);
 110 extern int kdbgetsymval(const char *, kdb_symtab_t *);
 111 extern int kdbnearsym(unsigned long, kdb_symtab_t *);
 112 extern void kdbnearsym_cleanup(void);
 113 extern char *kdb_strdup(const char *str, gfp_t type);
 114 extern void kdb_symbol_print(unsigned long, const kdb_symtab_t *, unsigned int);
 115
 116 /* Routine for debugging the debugger state. */
 117 extern void kdb_print_state(const char *, int);
 118
 119 extern int kdb_state;
 120 #define KDB_STATE_KDB           0x00000001      /* Cpu is inside kdb */
 121 #define KDB_STATE_LEAVING       0x00000002      /* Cpu is leaving kdb */
 122 #define KDB_STATE_CMD           0x00000004      /* Running a kdb command */
 123 #define KDB_STATE_KDB_CONTROL   0x00000008      /* This cpu is under
 124                                                  * kdb control */
 125 #define KDB_STATE_HOLD_CPU      0x00000010      /* Hold this cpu inside kdb */
 126 #define KDB_STATE_DOING_SS      0x00000020      /* Doing ss command */
 127 #define KDB_STATE_SSBPT         0x00000080      /* Install breakpoint
 128                                                  * after one ss, independent of
 129                                                  * DOING_SS */
 130 #define KDB_STATE_REENTRY       0x00000100      /* Valid re-entry into kdb */
 131 #define KDB_STATE_SUPPRESS      0x00000200      /* Suppress error messages */
 132 #define KDB_STATE_PAGER         0x00000400      /* pager is available */
 133 #define KDB_STATE_GO_SWITCH     0x00000800      /* go is switching
 134                                                  * back to initial cpu */
 135 #define KDB_STATE_PRINTF_LOCK   0x00001000      /* Holds kdb_printf lock */
 136 #define KDB_STATE_WAIT_IPI      0x00002000      /* Waiting for kdb_ipi() NMI */
 137 #define KDB_STATE_RECURSE       0x00004000      /* Recursive entry to kdb */
 138 #define KDB_STATE_IP_ADJUSTED   0x00008000      /* Restart IP has been
 139                                                  * adjusted */
 140 #define KDB_STATE_GO1           0x00010000      /* go only releases one cpu */
 141 #define KDB_STATE_KEYBOARD      0x00020000      /* kdb entered via
 142                                                  * keyboard on this cpu */
 143 #define KDB_STATE_KEXEC         0x00040000      /* kexec issued */
 144 #define KDB_STATE_DOING_KGDB    0x00080000      /* kgdb enter now issued */
 145 #define KDB_STATE_KGDB_TRANS    0x00200000      /* Transition to kgdb */
 146 #define KDB_STATE_ARCH          0xff000000      /* Reserved for arch
 147                                                  * specific use */
 148
 149 #define KDB_STATE(flag) (kdb_state & KDB_STATE_##flag)
 150 #define KDB_STATE_SET(flag) ((void)(kdb_state |= KDB_STATE_##flag))
 151 #define KDB_STATE_CLEAR(flag) ((void)(kdb_state &= ~KDB_STATE_##flag))
 152
 153 extern int kdb_nextline; /* Current number of lines displayed */
 154
 155 typedef struct _kdb_bp {
 156         unsigned long   bp_addr;        /* Address breakpoint is present at */
 157         unsigned int    bp_free:1;      /* This entry is available */
 158         unsigned int    bp_enabled:1;   /* Breakpoint is active in register */
 159         unsigned int    bp_type:4;      /* Uses hardware register */
 160         unsigned int    bp_installed:1; /* Breakpoint is installed */
 161         unsigned int    bp_delay:1;     /* Do delayed bp handling */
 162         unsigned int    bp_delayed:1;   /* Delayed breakpoint */
 163         unsigned int    bph_length;     /* HW break length */
 164 } kdb_bp_t;
 165
 166 #ifdef CONFIG_KGDB_KDB
 167 extern kdb_bp_t kdb_breakpoints[/* KDB_MAXBPT */];
 168
 169 /* The KDB shell command table */
 170 typedef struct _kdbtab {
 171         char    *cmd_name;              /* Command name */
 172         kdb_func_t cmd_func;            /* Function to execute command */
 173         char    *cmd_usage;             /* Usage String for this command */
 174         char    *cmd_help;              /* Help message for this command */
 175         short    cmd_minlen;            /* Minimum legal # command
 176                                          * chars required */
 177         kdb_cmdflags_t cmd_flags;       /* Command behaviour flags */
 178 } kdbtab_t;
 179
 180 extern int kdb_bt(int, const char **);  /* KDB display back trace */
 181
 182 /* KDB breakpoint management functions */
 183 extern void kdb_initbptab(void);
 184 extern void kdb_bp_install(struct pt_regs *);
 185 extern void kdb_bp_remove(void);
 186
 187 typedef enum {
 188         KDB_DB_BPT,     /* Breakpoint */
 189         KDB_DB_SS,      /* Single-step trap */
 190         KDB_DB_SSBPT,   /* Single step over breakpoint */
 191         KDB_DB_NOBPT    /* Spurious breakpoint */
 192 } kdb_dbtrap_t;
 193
 194 extern int kdb_main_loop(kdb_reason_t, kdb_reason_t,
 195                          int, kdb_dbtrap_t, struct pt_regs *);
 196
 197 /* Miscellaneous functions and data areas */
 198 extern int kdb_grepping_flag;
 199 #define KDB_GREPPING_FLAG_SEARCH 0x8000
 200 extern char kdb_grep_string[];
 201 #define KDB_GREP_STRLEN 256
 202 extern int kdb_grep_leading;
 203 extern int kdb_grep_trailing;
 204 extern char *kdb_cmds[];
 205 extern unsigned long kdb_task_state_string(const char *);
 206 extern char kdb_task_state_char (const struct task_struct *);
 207 extern unsigned long kdb_task_state(const struct task_struct *p,
 208                                     unsigned long mask);
 209 extern void kdb_ps_suppressed(void);
 210 extern void kdb_ps1(const struct task_struct *p);
 211 extern void kdb_print_nameval(const char *name, unsigned long val);
 212 extern void kdb_send_sig_info(struct task_struct *p, struct siginfo *info);
 213 extern void kdb_meminfo_proc_show(void);
 214 extern char *kdb_getstr(char *, size_t, const char *);
 215 extern void kdb_gdb_state_pass(char *buf);
 216
 217 /* Defines for kdb_symbol_print */
 218 #define KDB_SP_SPACEB   0x0001          /* Space before string */
 219 #define KDB_SP_SPACEA   0x0002          /* Space after string */
 220 #define KDB_SP_PAREN    0x0004          /* Parenthesis around string */
 221 #define KDB_SP_VALUE    0x0008          /* Print the value of the address */
 222 #define KDB_SP_SYMSIZE  0x0010          /* Print the size of the symbol */
 223 #define KDB_SP_NEWLINE  0x0020          /* Newline after string */
 224 #define KDB_SP_DEFAULT (KDB_SP_VALUE|KDB_SP_PAREN)
 225
 226 #define KDB_TSK(cpu) kgdb_info[cpu].task
 227 #define KDB_TSKREGS(cpu) kgdb_info[cpu].debuggerinfo
 228
 229 extern struct task_struct *kdb_curr_task(int);
 230
 231 #define kdb_task_has_cpu(p) (task_curr(p))
 232
 233 /* Simplify coexistence with NPTL */
 234 #define kdb_do_each_thread(g, p) do_each_thread(g, p)
 235 #define kdb_while_each_thread(g, p) while_each_thread(g, p)
 236
 237 #define GFP_KDB (in_interrupt() ? GFP_ATOMIC : GFP_KERNEL)
 238
 239 extern void *debug_kmalloc(size_t size, gfp_t flags);
 240 extern void debug_kfree(void *);
 241 extern void debug_kusage(void);
 242
 243 extern void kdb_set_current_task(struct task_struct *);
 244 extern struct task_struct *kdb_current_task;
 245
 246 #ifdef CONFIG_KDB_KEYBOARD
 247 extern void kdb_kbd_cleanup_state(void);
 248 #else /* ! CONFIG_KDB_KEYBOARD */
 249 #define kdb_kbd_cleanup_state()
 250 #endif /* ! CONFIG_KDB_KEYBOARD */
 251
 252 #ifdef CONFIG_MODULES
 253 extern struct list_head *kdb_modules;
 254 #endif /* CONFIG_MODULES */
 255
 256 extern char kdb_prompt_str[];
 257
 258 #define KDB_WORD_SIZE   ((int)sizeof(unsigned long))
 259
 260 #endif /* CONFIG_KGDB_KDB */
 261 #endif  /* !_KDBPRIVATE_H */