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linux/kernel/debug/kdb/kdb_private.h
Douglas Anderson 9441d5f6b7 kdb: Gid rid of implicit setting of the current task / regs 
Some (but not all?) of the kdb backtrace paths would cause the
kdb_current_task and kdb_current_regs to remain changed.  As discussed
in a review of a previous patch [1], this doesn't seem intuitive, so
let's fix that.

...but, it turns out that there's actually no longer any reason to set
the current task / current regs while backtracing anymore anyway.  As
of commit 2277b49258 ("kdb: Fix stack crawling on 'running' CPUs
that aren't the master") if we're backtracing on a task running on a
CPU we ask that CPU to do the backtrace itself.  Linux can do that
without anything fancy.  If we're doing backtrace on a sleeping task
we can also do that fine without updating globals.  So this patch
mostly just turns into deleting a bunch of code.

[1] https://lore.kernel.org/r/20191010150735.dhrj3pbjgmjrdpwr@holly.lan

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20191109111624.4.Ibc3d982bbeb9e46872d43973ba808cd4c79537c7@changeid
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
2020-01-31 17:34:00 +00:00

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#ifndef _KDBPRIVATE_H
#define _KDBPRIVATE_H
/*
* Kernel Debugger Architecture Independent Private Headers
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
* Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
*/
#include <linux/kgdb.h>
#include "../debug_core.h"
/* Kernel Debugger Command codes. Must not overlap with error codes. */
#define KDB_CMD_GO (-1001)
#define KDB_CMD_CPU (-1002)
#define KDB_CMD_SS (-1003)
#define KDB_CMD_KGDB (-1005)
/* Internal debug flags */
#define KDB_DEBUG_FLAG_BP 0x0002 /* Breakpoint subsystem debug */
#define KDB_DEBUG_FLAG_BB_SUMM 0x0004 /* Basic block analysis, summary only */
#define KDB_DEBUG_FLAG_AR 0x0008 /* Activation record, generic */
#define KDB_DEBUG_FLAG_ARA 0x0010 /* Activation record, arch specific */
#define KDB_DEBUG_FLAG_BB 0x0020 /* All basic block analysis */
#define KDB_DEBUG_FLAG_STATE 0x0040 /* State flags */
#define KDB_DEBUG_FLAG_MASK 0xffff /* All debug flags */
#define KDB_DEBUG_FLAG_SHIFT 16 /* Shift factor for dbflags */
#define KDB_DEBUG(flag) (kdb_flags & \
(KDB_DEBUG_FLAG_##flag << KDB_DEBUG_FLAG_SHIFT))
#define KDB_DEBUG_STATE(text, value) if (KDB_DEBUG(STATE)) \
kdb_print_state(text, value)
#if BITS_PER_LONG == 32
#define KDB_PLATFORM_ENV "BYTESPERWORD=4"
#define kdb_machreg_fmt "0x%lx"
#define kdb_machreg_fmt0 "0x%08lx"
#define kdb_bfd_vma_fmt "0x%lx"
#define kdb_bfd_vma_fmt0 "0x%08lx"
#define kdb_elfw_addr_fmt "0x%x"
#define kdb_elfw_addr_fmt0 "0x%08x"
#define kdb_f_count_fmt "%d"
#elif BITS_PER_LONG == 64
#define KDB_PLATFORM_ENV "BYTESPERWORD=8"
#define kdb_machreg_fmt "0x%lx"
#define kdb_machreg_fmt0 "0x%016lx"
#define kdb_bfd_vma_fmt "0x%lx"
#define kdb_bfd_vma_fmt0 "0x%016lx"
#define kdb_elfw_addr_fmt "0x%x"
#define kdb_elfw_addr_fmt0 "0x%016x"
#define kdb_f_count_fmt "%ld"
#endif
/*
* KDB_MAXBPT describes the total number of breakpoints
* supported by this architecure.
*/
#define KDB_MAXBPT 16
/* Symbol table format returned by kallsyms. */
typedef struct __ksymtab {
unsigned long value; /* Address of symbol */
const char *mod_name; /* Module containing symbol or
* "kernel" */
unsigned long mod_start;
unsigned long mod_end;
const char *sec_name; /* Section containing symbol */
unsigned long sec_start;
unsigned long sec_end;
const char *sym_name; /* Full symbol name, including
* any version */
unsigned long sym_start;
unsigned long sym_end;
} kdb_symtab_t;
extern int kallsyms_symbol_next(char *prefix_name, int flag, int buf_size);
extern int kallsyms_symbol_complete(char *prefix_name, int max_len);
/* Exported Symbols for kernel loadable modules to use. */
extern int kdb_getarea_size(void *, unsigned long, size_t);
extern int kdb_putarea_size(unsigned long, void *, size_t);
/*
* Like get_user and put_user, kdb_getarea and kdb_putarea take variable
* names, not pointers. The underlying *_size functions take pointers.
*/
#define kdb_getarea(x, addr) kdb_getarea_size(&(x), addr, sizeof((x)))
#define kdb_putarea(addr, x) kdb_putarea_size(addr, &(x), sizeof((x)))
extern int kdb_getphysword(unsigned long *word,
unsigned long addr, size_t size);
extern int kdb_getword(unsigned long *, unsigned long, size_t);
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 kdbgetaddrarg(int, const char **, int*, unsigned long *,
long *, char **);
extern int kdbgetsymval(const char *, kdb_symtab_t *);
extern int kdbnearsym(unsigned long, kdb_symtab_t *);
extern void kdbnearsym_cleanup(void);
extern char *kdb_strdup(const char *str, gfp_t type);
extern void kdb_symbol_print(unsigned long, const kdb_symtab_t *, unsigned int);
/* Routine for debugging the debugger state. */
extern void kdb_print_state(const char *, int);
extern int kdb_state;
#define KDB_STATE_KDB 0x00000001 /* Cpu is inside kdb */
#define KDB_STATE_LEAVING 0x00000002 /* Cpu is leaving kdb */
#define KDB_STATE_CMD 0x00000004 /* Running a kdb command */
#define KDB_STATE_KDB_CONTROL 0x00000008 /* This cpu is under
* kdb control */
#define KDB_STATE_HOLD_CPU 0x00000010 /* Hold this cpu inside kdb */
#define KDB_STATE_DOING_SS 0x00000020 /* Doing ss command */
#define KDB_STATE_SSBPT 0x00000080 /* Install breakpoint
* after one ss, independent of
* DOING_SS */
#define KDB_STATE_REENTRY 0x00000100 /* Valid re-entry into kdb */
#define KDB_STATE_SUPPRESS 0x00000200 /* Suppress error messages */
#define KDB_STATE_PAGER 0x00000400 /* pager is available */
#define KDB_STATE_GO_SWITCH 0x00000800 /* go is switching
* back to initial cpu */
#define KDB_STATE_WAIT_IPI 0x00002000 /* Waiting for kdb_ipi() NMI */
#define KDB_STATE_RECURSE 0x00004000 /* Recursive entry to kdb */
#define KDB_STATE_IP_ADJUSTED 0x00008000 /* Restart IP has been
* adjusted */
#define KDB_STATE_GO1 0x00010000 /* go only releases one cpu */
#define KDB_STATE_KEYBOARD 0x00020000 /* kdb entered via
* keyboard on this cpu */
#define KDB_STATE_KEXEC 0x00040000 /* kexec issued */
#define KDB_STATE_DOING_KGDB 0x00080000 /* kgdb enter now issued */
#define KDB_STATE_KGDB_TRANS 0x00200000 /* Transition to kgdb */
#define KDB_STATE_ARCH 0xff000000 /* Reserved for arch
* specific use */
#define KDB_STATE(flag) (kdb_state & KDB_STATE_##flag)
#define KDB_STATE_SET(flag) ((void)(kdb_state |= KDB_STATE_##flag))
#define KDB_STATE_CLEAR(flag) ((void)(kdb_state &= ~KDB_STATE_##flag))
extern int kdb_nextline; /* Current number of lines displayed */
typedef struct _kdb_bp {
unsigned long bp_addr; /* Address breakpoint is present at */
unsigned int bp_free:1; /* This entry is available */
unsigned int bp_enabled:1; /* Breakpoint is active in register */
unsigned int bp_type:4; /* Uses hardware register */
unsigned int bp_installed:1; /* Breakpoint is installed */
unsigned int bp_delay:1; /* Do delayed bp handling */
unsigned int bp_delayed:1; /* Delayed breakpoint */
unsigned int bph_length; /* HW break length */
} kdb_bp_t;
#ifdef CONFIG_KGDB_KDB
extern kdb_bp_t kdb_breakpoints[/* KDB_MAXBPT */];
/* The KDB shell command table */
typedef struct _kdbtab {
char *cmd_name; /* Command name */
kdb_func_t cmd_func; /* Function to execute command */
char *cmd_usage; /* Usage String for this command */
char *cmd_help; /* Help message for this command */
short cmd_minlen; /* Minimum legal # command
* chars required */
kdb_cmdflags_t cmd_flags; /* Command behaviour flags */
} kdbtab_t;
extern int kdb_bt(int, const char **); /* KDB display back trace */
/* KDB breakpoint management functions */
extern void kdb_initbptab(void);
extern void kdb_bp_install(struct pt_regs *);
extern void kdb_bp_remove(void);
typedef enum {
KDB_DB_BPT, /* Breakpoint */
KDB_DB_SS, /* Single-step trap */
KDB_DB_SSBPT, /* Single step over breakpoint */
KDB_DB_NOBPT /* Spurious breakpoint */
} kdb_dbtrap_t;
extern int kdb_main_loop(kdb_reason_t, kdb_reason_t,
int, kdb_dbtrap_t, struct pt_regs *);
/* Miscellaneous functions and data areas */
extern int kdb_grepping_flag;
#define KDB_GREPPING_FLAG_SEARCH 0x8000
extern char kdb_grep_string[];
#define KDB_GREP_STRLEN 256
extern int kdb_grep_leading;
extern int kdb_grep_trailing;
extern char *kdb_cmds[];
extern unsigned long kdb_task_state_string(const char *);
extern char kdb_task_state_char (const struct task_struct *);
extern unsigned long kdb_task_state(const struct task_struct *p,
unsigned long mask);
extern void kdb_ps_suppressed(void);
extern void kdb_ps1(const struct task_struct *p);
extern void kdb_print_nameval(const char *name, unsigned long val);
extern void kdb_send_sig(struct task_struct *p, int sig);
extern void kdb_meminfo_proc_show(void);
extern char kdb_getchar(void);
extern char *kdb_getstr(char *, size_t, const char *);
extern void kdb_gdb_state_pass(char *buf);
/* Defines for kdb_symbol_print */
#define KDB_SP_SPACEB 0x0001 /* Space before string */
#define KDB_SP_SPACEA 0x0002 /* Space after string */
#define KDB_SP_PAREN 0x0004 /* Parenthesis around string */
#define KDB_SP_VALUE 0x0008 /* Print the value of the address */
#define KDB_SP_SYMSIZE 0x0010 /* Print the size of the symbol */
#define KDB_SP_NEWLINE 0x0020 /* Newline after string */
#define KDB_SP_DEFAULT (KDB_SP_VALUE|KDB_SP_PAREN)
#define KDB_TSK(cpu) kgdb_info[cpu].task
#define KDB_TSKREGS(cpu) kgdb_info[cpu].debuggerinfo
extern struct task_struct *kdb_curr_task(int);
#define kdb_task_has_cpu(p) (task_curr(p))
/* Simplify coexistence with NPTL */
#define kdb_do_each_thread(g, p) do_each_thread(g, p)
#define kdb_while_each_thread(g, p) while_each_thread(g, p)
#define GFP_KDB (in_interrupt() ? GFP_ATOMIC : GFP_KERNEL)
extern void *debug_kmalloc(size_t size, gfp_t flags);
extern void debug_kfree(void *);
extern void debug_kusage(void);
extern struct task_struct *kdb_current_task;
extern struct pt_regs *kdb_current_regs;
#ifdef CONFIG_KDB_KEYBOARD
extern void kdb_kbd_cleanup_state(void);
#else /* ! CONFIG_KDB_KEYBOARD */
#define kdb_kbd_cleanup_state()
#endif /* ! CONFIG_KDB_KEYBOARD */
#ifdef CONFIG_MODULES
extern struct list_head *kdb_modules;
#endif /* CONFIG_MODULES */
extern char kdb_prompt_str[];
#define KDB_WORD_SIZE ((int)sizeof(unsigned long))
#endif /* CONFIG_KGDB_KDB */
#endif /* !_KDBPRIVATE_H */
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