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_SSB     (-1004)
  23 #define KDB_CMD_KGDB (-1005)
  24
  25 /* Internal debug flags */
  26 #define KDB_DEBUG_FLAG_BP       0x0002  /* Breakpoint subsystem debug */
  27 #define KDB_DEBUG_FLAG_BB_SUMM  0x0004  /* Basic block analysis, summary only */
  28 #define KDB_DEBUG_FLAG_AR       0x0008  /* Activation record, generic */
  29 #define KDB_DEBUG_FLAG_ARA      0x0010  /* Activation record, arch specific */
  30 #define KDB_DEBUG_FLAG_BB       0x0020  /* All basic block analysis */
  31 #define KDB_DEBUG_FLAG_STATE    0x0040  /* State flags */
  32 #define KDB_DEBUG_FLAG_MASK     0xffff  /* All debug flags */
  33 #define KDB_DEBUG_FLAG_SHIFT    16      /* Shift factor for dbflags */
  34
  35 #define KDB_DEBUG(flag) (kdb_flags & \
  36         (KDB_DEBUG_FLAG_##flag << KDB_DEBUG_FLAG_SHIFT))
  37 #define KDB_DEBUG_STATE(text, value) if (KDB_DEBUG(STATE)) \
  38                 kdb_print_state(text, value)
  39
  40 #if BITS_PER_LONG == 32
  41
  42 #define KDB_PLATFORM_ENV        "BYTESPERWORD=4"
  43
  44 #define kdb_machreg_fmt         "0x%lx"
  45 #define kdb_machreg_fmt0        "0x%08lx"
  46 #define kdb_bfd_vma_fmt         "0x%lx"
  47 #define kdb_bfd_vma_fmt0        "0x%08lx"
  48 #define kdb_elfw_addr_fmt       "0x%x"
  49 #define kdb_elfw_addr_fmt0      "0x%08x"
  50 #define kdb_f_count_fmt         "%d"
  51
  52 #elif BITS_PER_LONG == 64
  53
  54 #define KDB_PLATFORM_ENV        "BYTESPERWORD=8"
  55
  56 #define kdb_machreg_fmt         "0x%lx"
  57 #define kdb_machreg_fmt0        "0x%016lx"
  58 #define kdb_bfd_vma_fmt         "0x%lx"
  59 #define kdb_bfd_vma_fmt0        "0x%016lx"
  60 #define kdb_elfw_addr_fmt       "0x%x"
  61 #define kdb_elfw_addr_fmt0      "0x%016x"
  62 #define kdb_f_count_fmt         "%ld"
  63
  64 #endif
  65
  66 /*
  67  * KDB_MAXBPT describes the total number of breakpoints
  68  * supported by this architecure.
  69  */
  70 #define KDB_MAXBPT      16
  71
  72 /* Symbol table format returned by kallsyms. */
  73 typedef struct __ksymtab {
  74                 unsigned long value;    /* Address of symbol */
  75                 const char *mod_name;   /* Module containing symbol or
  76                                          * "kernel" */
  77                 unsigned long mod_start;
  78                 unsigned long mod_end;
  79                 const char *sec_name;   /* Section containing symbol */
  80                 unsigned long sec_start;
  81                 unsigned long sec_end;
  82                 const char *sym_name;   /* Full symbol name, including
  83                                          * any version */
  84                 unsigned long sym_start;
  85                 unsigned long sym_end;
  86                 } kdb_symtab_t;
  87 extern int kallsyms_symbol_next(char *prefix_name, int flag);
  88 extern int kallsyms_symbol_complete(char *prefix_name, int max_len);
  89
  90 /* Exported Symbols for kernel loadable modules to use. */
  91 extern int kdb_getarea_size(void *, unsigned long, size_t);
  92 extern int kdb_putarea_size(unsigned long, void *, size_t);
  93
  94 /*
  95  * Like get_user and put_user, kdb_getarea and kdb_putarea take variable
  96  * names, not pointers.  The underlying *_size functions take pointers.
  97  */
  98 #define kdb_getarea(x, addr) kdb_getarea_size(&(x), addr, sizeof((x)))
  99 #define kdb_putarea(addr, x) kdb_putarea_size(addr, &(x), sizeof((x)))
 100
 101 extern int kdb_getphysword(unsigned long *word,
 102                         unsigned long addr, size_t size);
 103 extern int kdb_getword(unsigned long *, unsigned long, size_t);
 104 extern int kdb_putword(unsigned long, unsigned long, size_t);
 105
 106 extern int kdbgetularg(const char *, unsigned long *);
 107 extern int kdbgetu64arg(const char *, u64 *);
 108 extern char *kdbgetenv(const char *);
 109 extern int kdbgetaddrarg(int, const char **, int*, unsigned long *,
 110                          long *, char **);
 111 extern int kdbgetsymval(const char *, kdb_symtab_t *);
 112 extern int kdbnearsym(unsigned long, kdb_symtab_t *);
 113 extern void kdbnearsym_cleanup(void);
 114 extern char *kdb_strdup(const char *str, gfp_t type);
 115 extern void kdb_symbol_print(unsigned long, const kdb_symtab_t *, unsigned int);
 116
 117 /* Routine for debugging the debugger state. */
 118 extern void kdb_print_state(const char *, int);
 119
 120 extern int kdb_state;
 121 #define KDB_STATE_KDB           0x00000001      /* Cpu is inside kdb */
 122 #define KDB_STATE_LEAVING       0x00000002      /* Cpu is leaving kdb */
 123 #define KDB_STATE_CMD           0x00000004      /* Running a kdb command */
 124 #define KDB_STATE_KDB_CONTROL   0x00000008      /* This cpu is under
 125                                                  * kdb control */
 126 #define KDB_STATE_HOLD_CPU      0x00000010      /* Hold this cpu inside kdb */
 127 #define KDB_STATE_DOING_SS      0x00000020      /* Doing ss command */
 128 #define KDB_STATE_DOING_SSB     0x00000040      /* Doing ssb command,
 129                                                  * DOING_SS is also set */
 130 #define KDB_STATE_SSBPT         0x00000080      /* Install breakpoint
 131                                                  * after one ss, independent of
 132                                                  * DOING_SS */
 133 #define KDB_STATE_REENTRY       0x00000100      /* Valid re-entry into kdb */
 134 #define KDB_STATE_SUPPRESS      0x00000200      /* Suppress error messages */
 135 #define KDB_STATE_PAGER         0x00000400      /* pager is available */
 136 #define KDB_STATE_GO_SWITCH     0x00000800      /* go is switching
 137                                                  * back to initial cpu */
 138 #define KDB_STATE_PRINTF_LOCK   0x00001000      /* Holds kdb_printf lock */
 139 #define KDB_STATE_WAIT_IPI      0x00002000      /* Waiting for kdb_ipi() NMI */
 140 #define KDB_STATE_RECURSE       0x00004000      /* Recursive entry to kdb */
 141 #define KDB_STATE_IP_ADJUSTED   0x00008000      /* Restart IP has been
 142                                                  * adjusted */
 143 #define KDB_STATE_GO1           0x00010000      /* go only releases one cpu */
 144 #define KDB_STATE_KEYBOARD      0x00020000      /* kdb entered via
 145                                                  * keyboard on this cpu */
 146 #define KDB_STATE_KEXEC         0x00040000      /* kexec issued */
 147 #define KDB_STATE_DOING_KGDB    0x00080000      /* kgdb enter now issued */
 148 #define KDB_STATE_KGDB_TRANS    0x00200000      /* Transition to kgdb */
 149 #define KDB_STATE_ARCH          0xff000000      /* Reserved for arch
 150                                                  * specific use */
 151
 152 #define KDB_STATE(flag) (kdb_state & KDB_STATE_##flag)
 153 #define KDB_STATE_SET(flag) ((void)(kdb_state |= KDB_STATE_##flag))
 154 #define KDB_STATE_CLEAR(flag) ((void)(kdb_state &= ~KDB_STATE_##flag))
 155
 156 extern int kdb_nextline; /* Current number of lines displayed */
 157
 158 typedef struct _kdb_bp {
 159         unsigned long   bp_addr;        /* Address breakpoint is present at */
 160         unsigned int    bp_free:1;      /* This entry is available */
 161         unsigned int    bp_enabled:1;   /* Breakpoint is active in register */
 162         unsigned int    bp_type:4;      /* Uses hardware register */
 163         unsigned int    bp_installed:1; /* Breakpoint is installed */
 164         unsigned int    bp_delay:1;     /* Do delayed bp handling */
 165         unsigned int    bp_delayed:1;   /* Delayed breakpoint */
 166         unsigned int    bph_length;     /* HW break length */
 167 } kdb_bp_t;
 168
 169 #ifdef CONFIG_KGDB_KDB
 170 extern kdb_bp_t kdb_breakpoints[/* KDB_MAXBPT */];
 171
 172 /* The KDB shell command table */
 173 typedef struct _kdbtab {
 174         char    *cmd_name;              /* Command name */
 175         kdb_func_t cmd_func;            /* Function to execute command */
 176         char    *cmd_usage;             /* Usage String for this command */
 177         char    *cmd_help;              /* Help message for this command */
 178         short    cmd_flags;             /* Parsing flags */
 179         short    cmd_minlen;            /* Minimum legal # command
 180                                          * chars required */
 181         kdb_repeat_t cmd_repeat;        /* Does command auto repeat on enter? */
 182 } kdbtab_t;
 183
 184 extern int kdb_bt(int, const char **);  /* KDB display back trace */
 185
 186 /* KDB breakpoint management functions */
 187 extern void kdb_initbptab(void);
 188 extern void kdb_bp_install(struct pt_regs *);
 189 extern void kdb_bp_remove(void);
 190
 191 typedef enum {
 192         KDB_DB_BPT,     /* Breakpoint */
 193         KDB_DB_SS,      /* Single-step trap */
 194         KDB_DB_SSB,     /* Single step to branch */
 195         KDB_DB_SSBPT,   /* Single step over breakpoint */
 196         KDB_DB_NOBPT    /* Spurious breakpoint */
 197 } kdb_dbtrap_t;
 198
 199 extern int kdb_main_loop(kdb_reason_t, kdb_reason_t,
 200                          int, kdb_dbtrap_t, struct pt_regs *);
 201
 202 /* Miscellaneous functions and data areas */
 203 extern int kdb_grepping_flag;
 204 extern char kdb_grep_string[];
 205 extern int kdb_grep_leading;
 206 extern int kdb_grep_trailing;
 207 extern char *kdb_cmds[];
 208 extern void kdb_syslog_data(char *syslog_data[]);
 209 extern unsigned long kdb_task_state_string(const char *);
 210 extern char kdb_task_state_char (const struct task_struct *);
 211 extern unsigned long kdb_task_state(const struct task_struct *p,
 212                                     unsigned long mask);
 213 extern void kdb_ps_suppressed(void);
 214 extern void kdb_ps1(const struct task_struct *p);
 215 extern void kdb_print_nameval(const char *name, unsigned long val);
 216 extern void kdb_send_sig_info(struct task_struct *p, struct siginfo *info);
 217 extern void kdb_meminfo_proc_show(void);
 218 extern char *kdb_getstr(char *, size_t, char *);
 219 extern void kdb_gdb_state_pass(char *buf);
 220
 221 /* Defines for kdb_symbol_print */
 222 #define KDB_SP_SPACEB   0x0001          /* Space before string */
 223 #define KDB_SP_SPACEA   0x0002          /* Space after string */
 224 #define KDB_SP_PAREN    0x0004          /* Parenthesis around string */
 225 #define KDB_SP_VALUE    0x0008          /* Print the value of the address */
 226 #define KDB_SP_SYMSIZE  0x0010          /* Print the size of the symbol */
 227 #define KDB_SP_NEWLINE  0x0020          /* Newline after string */
 228 #define KDB_SP_DEFAULT (KDB_SP_VALUE|KDB_SP_PAREN)
 229
 230 #define KDB_TSK(cpu) kgdb_info[cpu].task
 231 #define KDB_TSKREGS(cpu) kgdb_info[cpu].debuggerinfo
 232
 233 extern struct task_struct *kdb_curr_task(int);
 234
 235 #define kdb_task_has_cpu(p) (task_curr(p))
 236
 237 /* Simplify coexistence with NPTL */
 238 #define kdb_do_each_thread(g, p) do_each_thread(g, p)
 239 #define kdb_while_each_thread(g, p) while_each_thread(g, p)
 240
 241 #define GFP_KDB (in_interrupt() ? GFP_ATOMIC : GFP_KERNEL)
 242
 243 extern void *debug_kmalloc(size_t size, gfp_t flags);
 244 extern void debug_kfree(void *);
 245 extern void debug_kusage(void);
 246
 247 extern void kdb_set_current_task(struct task_struct *);
 248 extern struct task_struct *kdb_current_task;
 249 #ifdef CONFIG_MODULES
 250 extern struct list_head *kdb_modules;
 251 #endif /* CONFIG_MODULES */
 252
 253 extern char kdb_prompt_str[];
 254
 255 #define KDB_WORD_SIZE   ((int)sizeof(unsigned long))
 256
 257 #endif /* CONFIG_KGDB_KDB */
 258 #endif  /* !_KDBPRIVATE_H */