forked from luck/tmp_suning_uos_patched
9441d5f6b7
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>
262 lines
9.4 KiB
C
262 lines
9.4 KiB
C
#ifndef _KDBPRIVATE_H
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#define _KDBPRIVATE_H
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/*
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* Kernel Debugger Architecture Independent Private Headers
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
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* Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
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*/
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#include <linux/kgdb.h>
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#include "../debug_core.h"
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/* Kernel Debugger Command codes. Must not overlap with error codes. */
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#define KDB_CMD_GO (-1001)
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#define KDB_CMD_CPU (-1002)
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#define KDB_CMD_SS (-1003)
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#define KDB_CMD_KGDB (-1005)
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/* Internal debug flags */
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#define KDB_DEBUG_FLAG_BP 0x0002 /* Breakpoint subsystem debug */
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#define KDB_DEBUG_FLAG_BB_SUMM 0x0004 /* Basic block analysis, summary only */
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#define KDB_DEBUG_FLAG_AR 0x0008 /* Activation record, generic */
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#define KDB_DEBUG_FLAG_ARA 0x0010 /* Activation record, arch specific */
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#define KDB_DEBUG_FLAG_BB 0x0020 /* All basic block analysis */
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#define KDB_DEBUG_FLAG_STATE 0x0040 /* State flags */
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#define KDB_DEBUG_FLAG_MASK 0xffff /* All debug flags */
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#define KDB_DEBUG_FLAG_SHIFT 16 /* Shift factor for dbflags */
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#define KDB_DEBUG(flag) (kdb_flags & \
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(KDB_DEBUG_FLAG_##flag << KDB_DEBUG_FLAG_SHIFT))
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#define KDB_DEBUG_STATE(text, value) if (KDB_DEBUG(STATE)) \
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kdb_print_state(text, value)
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#if BITS_PER_LONG == 32
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#define KDB_PLATFORM_ENV "BYTESPERWORD=4"
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#define kdb_machreg_fmt "0x%lx"
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#define kdb_machreg_fmt0 "0x%08lx"
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#define kdb_bfd_vma_fmt "0x%lx"
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#define kdb_bfd_vma_fmt0 "0x%08lx"
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#define kdb_elfw_addr_fmt "0x%x"
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#define kdb_elfw_addr_fmt0 "0x%08x"
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#define kdb_f_count_fmt "%d"
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#elif BITS_PER_LONG == 64
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#define KDB_PLATFORM_ENV "BYTESPERWORD=8"
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#define kdb_machreg_fmt "0x%lx"
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#define kdb_machreg_fmt0 "0x%016lx"
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#define kdb_bfd_vma_fmt "0x%lx"
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#define kdb_bfd_vma_fmt0 "0x%016lx"
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#define kdb_elfw_addr_fmt "0x%x"
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#define kdb_elfw_addr_fmt0 "0x%016x"
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#define kdb_f_count_fmt "%ld"
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#endif
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/*
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* KDB_MAXBPT describes the total number of breakpoints
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* supported by this architecure.
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*/
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#define KDB_MAXBPT 16
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/* Symbol table format returned by kallsyms. */
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typedef struct __ksymtab {
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unsigned long value; /* Address of symbol */
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const char *mod_name; /* Module containing symbol or
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* "kernel" */
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unsigned long mod_start;
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unsigned long mod_end;
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const char *sec_name; /* Section containing symbol */
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unsigned long sec_start;
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unsigned long sec_end;
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const char *sym_name; /* Full symbol name, including
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* any version */
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unsigned long sym_start;
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unsigned long sym_end;
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} kdb_symtab_t;
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extern int kallsyms_symbol_next(char *prefix_name, int flag, int buf_size);
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extern int kallsyms_symbol_complete(char *prefix_name, int max_len);
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/* Exported Symbols for kernel loadable modules to use. */
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extern int kdb_getarea_size(void *, unsigned long, size_t);
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extern int kdb_putarea_size(unsigned long, void *, size_t);
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/*
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* Like get_user and put_user, kdb_getarea and kdb_putarea take variable
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* names, not pointers. The underlying *_size functions take pointers.
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*/
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#define kdb_getarea(x, addr) kdb_getarea_size(&(x), addr, sizeof((x)))
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#define kdb_putarea(addr, x) kdb_putarea_size(addr, &(x), sizeof((x)))
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extern int kdb_getphysword(unsigned long *word,
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unsigned long addr, size_t size);
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extern int kdb_getword(unsigned long *, unsigned long, size_t);
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extern int kdb_putword(unsigned long, unsigned long, size_t);
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extern int kdbgetularg(const char *, unsigned long *);
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extern int kdbgetu64arg(const char *, u64 *);
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extern char *kdbgetenv(const char *);
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extern int kdbgetaddrarg(int, const char **, int*, unsigned long *,
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long *, char **);
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extern int kdbgetsymval(const char *, kdb_symtab_t *);
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extern int kdbnearsym(unsigned long, kdb_symtab_t *);
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extern void kdbnearsym_cleanup(void);
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extern char *kdb_strdup(const char *str, gfp_t type);
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extern void kdb_symbol_print(unsigned long, const kdb_symtab_t *, unsigned int);
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/* Routine for debugging the debugger state. */
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extern void kdb_print_state(const char *, int);
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extern int kdb_state;
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#define KDB_STATE_KDB 0x00000001 /* Cpu is inside kdb */
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#define KDB_STATE_LEAVING 0x00000002 /* Cpu is leaving kdb */
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#define KDB_STATE_CMD 0x00000004 /* Running a kdb command */
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#define KDB_STATE_KDB_CONTROL 0x00000008 /* This cpu is under
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* kdb control */
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#define KDB_STATE_HOLD_CPU 0x00000010 /* Hold this cpu inside kdb */
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#define KDB_STATE_DOING_SS 0x00000020 /* Doing ss command */
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#define KDB_STATE_SSBPT 0x00000080 /* Install breakpoint
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* after one ss, independent of
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* DOING_SS */
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#define KDB_STATE_REENTRY 0x00000100 /* Valid re-entry into kdb */
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#define KDB_STATE_SUPPRESS 0x00000200 /* Suppress error messages */
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#define KDB_STATE_PAGER 0x00000400 /* pager is available */
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#define KDB_STATE_GO_SWITCH 0x00000800 /* go is switching
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* back to initial cpu */
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#define KDB_STATE_WAIT_IPI 0x00002000 /* Waiting for kdb_ipi() NMI */
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#define KDB_STATE_RECURSE 0x00004000 /* Recursive entry to kdb */
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#define KDB_STATE_IP_ADJUSTED 0x00008000 /* Restart IP has been
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* adjusted */
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#define KDB_STATE_GO1 0x00010000 /* go only releases one cpu */
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#define KDB_STATE_KEYBOARD 0x00020000 /* kdb entered via
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* keyboard on this cpu */
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#define KDB_STATE_KEXEC 0x00040000 /* kexec issued */
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#define KDB_STATE_DOING_KGDB 0x00080000 /* kgdb enter now issued */
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#define KDB_STATE_KGDB_TRANS 0x00200000 /* Transition to kgdb */
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#define KDB_STATE_ARCH 0xff000000 /* Reserved for arch
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* specific use */
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#define KDB_STATE(flag) (kdb_state & KDB_STATE_##flag)
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#define KDB_STATE_SET(flag) ((void)(kdb_state |= KDB_STATE_##flag))
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#define KDB_STATE_CLEAR(flag) ((void)(kdb_state &= ~KDB_STATE_##flag))
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extern int kdb_nextline; /* Current number of lines displayed */
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typedef struct _kdb_bp {
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unsigned long bp_addr; /* Address breakpoint is present at */
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unsigned int bp_free:1; /* This entry is available */
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unsigned int bp_enabled:1; /* Breakpoint is active in register */
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unsigned int bp_type:4; /* Uses hardware register */
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unsigned int bp_installed:1; /* Breakpoint is installed */
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unsigned int bp_delay:1; /* Do delayed bp handling */
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unsigned int bp_delayed:1; /* Delayed breakpoint */
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unsigned int bph_length; /* HW break length */
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} kdb_bp_t;
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#ifdef CONFIG_KGDB_KDB
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extern kdb_bp_t kdb_breakpoints[/* KDB_MAXBPT */];
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/* The KDB shell command table */
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typedef struct _kdbtab {
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char *cmd_name; /* Command name */
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kdb_func_t cmd_func; /* Function to execute command */
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char *cmd_usage; /* Usage String for this command */
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char *cmd_help; /* Help message for this command */
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short cmd_minlen; /* Minimum legal # command
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* chars required */
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kdb_cmdflags_t cmd_flags; /* Command behaviour flags */
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} kdbtab_t;
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extern int kdb_bt(int, const char **); /* KDB display back trace */
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/* KDB breakpoint management functions */
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extern void kdb_initbptab(void);
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extern void kdb_bp_install(struct pt_regs *);
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extern void kdb_bp_remove(void);
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typedef enum {
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KDB_DB_BPT, /* Breakpoint */
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KDB_DB_SS, /* Single-step trap */
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KDB_DB_SSBPT, /* Single step over breakpoint */
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KDB_DB_NOBPT /* Spurious breakpoint */
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} kdb_dbtrap_t;
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extern int kdb_main_loop(kdb_reason_t, kdb_reason_t,
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int, kdb_dbtrap_t, struct pt_regs *);
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/* Miscellaneous functions and data areas */
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extern int kdb_grepping_flag;
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#define KDB_GREPPING_FLAG_SEARCH 0x8000
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extern char kdb_grep_string[];
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#define KDB_GREP_STRLEN 256
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extern int kdb_grep_leading;
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extern int kdb_grep_trailing;
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extern char *kdb_cmds[];
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extern unsigned long kdb_task_state_string(const char *);
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extern char kdb_task_state_char (const struct task_struct *);
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extern unsigned long kdb_task_state(const struct task_struct *p,
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unsigned long mask);
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extern void kdb_ps_suppressed(void);
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extern void kdb_ps1(const struct task_struct *p);
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extern void kdb_print_nameval(const char *name, unsigned long val);
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extern void kdb_send_sig(struct task_struct *p, int sig);
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extern void kdb_meminfo_proc_show(void);
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extern char kdb_getchar(void);
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extern char *kdb_getstr(char *, size_t, const char *);
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extern void kdb_gdb_state_pass(char *buf);
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/* Defines for kdb_symbol_print */
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#define KDB_SP_SPACEB 0x0001 /* Space before string */
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#define KDB_SP_SPACEA 0x0002 /* Space after string */
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#define KDB_SP_PAREN 0x0004 /* Parenthesis around string */
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#define KDB_SP_VALUE 0x0008 /* Print the value of the address */
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#define KDB_SP_SYMSIZE 0x0010 /* Print the size of the symbol */
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#define KDB_SP_NEWLINE 0x0020 /* Newline after string */
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#define KDB_SP_DEFAULT (KDB_SP_VALUE|KDB_SP_PAREN)
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#define KDB_TSK(cpu) kgdb_info[cpu].task
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#define KDB_TSKREGS(cpu) kgdb_info[cpu].debuggerinfo
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extern struct task_struct *kdb_curr_task(int);
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#define kdb_task_has_cpu(p) (task_curr(p))
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/* Simplify coexistence with NPTL */
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#define kdb_do_each_thread(g, p) do_each_thread(g, p)
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#define kdb_while_each_thread(g, p) while_each_thread(g, p)
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#define GFP_KDB (in_interrupt() ? GFP_ATOMIC : GFP_KERNEL)
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extern void *debug_kmalloc(size_t size, gfp_t flags);
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extern void debug_kfree(void *);
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extern void debug_kusage(void);
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extern struct task_struct *kdb_current_task;
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extern struct pt_regs *kdb_current_regs;
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#ifdef CONFIG_KDB_KEYBOARD
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extern void kdb_kbd_cleanup_state(void);
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#else /* ! CONFIG_KDB_KEYBOARD */
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#define kdb_kbd_cleanup_state()
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#endif /* ! CONFIG_KDB_KEYBOARD */
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#ifdef CONFIG_MODULES
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extern struct list_head *kdb_modules;
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#endif /* CONFIG_MODULES */
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extern char kdb_prompt_str[];
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#define KDB_WORD_SIZE ((int)sizeof(unsigned long))
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#endif /* CONFIG_KGDB_KDB */
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#endif /* !_KDBPRIVATE_H */
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