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teawater / kgtp

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/*
* Kernel GDB tracepoint module.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright(C) KGTP team (http://teawater.github.io/kgtp/), 2010-2014
*
*/
/* If "* 10" means that this is not a release version. */
#define GTP_VERSION (20140510 * 10)
#include <linux/version.h>
#ifndef RHEL_RELEASE_VERSION
#define RHEL_RELEASE_VERSION(a,b) (((a) << 8) + (b))
#define RHEL_RELEASE_CODE 0
#endif
/* Sepcial config ------------------------------------------------ */
#define GTP_RB
#ifdef GTP_FRAME_SIMPLE
/* This is a debug option.
This define is for simple frame alloc record, then we can get how many
memory are weste by FRAME_ALIGN. */
/* #define FRAME_ALLOC_RECORD */
#undef GTP_RB
#endif
#ifdef GTP_FTRACE_RING_BUFFER
#undef GTP_RB
#endif
/* If define USE_PROC, KGTP will use ProcFS instead DebugFS. */
#ifndef GTP_NO_AUTO_BUILD
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,11))
#define USE_PROC
#endif
#endif
#ifndef USE_PROC
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,11))
#ifndef NO_WARNING
#warning If got some build error about debugfs, you can use "USE_PROC=1" handle it.
#endif
#endif
#endif
#ifdef GTP_FTRACE_RING_BUFFER
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,30))
#ifndef NO_WARNING
#warning If got some build error about ring buffer, you can use "FRAME_SIMPLE=1" handle it.
#endif
#endif
#endif
/* If define GTP_CLOCK_CYCLE, $clock will return rdtscll. */
#ifndef GTP_NO_AUTO_BUILD
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24))
#define GTP_CLOCK_CYCLE
#endif
#endif
#ifndef GTP_CLOCK_CYCLE
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24))
#ifndef NO_WARNING
#warning If got some build error about cpu_clock or local_clock, you can use "CLOCK_CYCLE=1" handle it.
#endif
#endif
#endif
#ifdef CONFIG_LOCKDEP
#ifndef NO_WARNING
#warning Current kernel open the runtime locking correctness validator (CONFIG_LOCKDEP) that will make KGTP trace functions about locks get deadlock. Please DO NOT trace function about locks.
#endif
#endif
#ifdef GTP_FTRACE_RING_BUFFER
#ifndef CONFIG_RING_BUFFER
#define CONFIG_RING_BUFFER
#include "ring_buffer.h"
#include "ring_buffer.c"
#define GTP_SELF_RING_BUFFER
#ifndef NO_WARNING
#warning Use the ring buffer inside KGTP.
#endif
#endif
#endif
/* Sepcial config ------------------------------------------------ */
#include <linux/kernel.h>
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,14,0))
#undef MODULE
#include <linux/preempt.h>
#define MODULE
#endif
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/poll.h>
#include <linux/kprobes.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/debugfs.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/ctype.h>
#include <asm/atomic.h>
#ifdef CONFIG_X86
#include <asm/debugreg.h>
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22))
#include <linux/kdebug.h>
#else
#include <asm/kdebug.h>
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
#include <linux/hw_breakpoint.h>
#endif
#include "gtp.h"
#ifdef GTP_FTRACE_RING_BUFFER
#ifndef GTP_SELF_RING_BUFFER
#include <linux/ring_buffer.h>
#endif
#endif
#ifdef CONFIG_PERF_EVENTS
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)) \
&& (RHEL_RELEASE_CODE < RHEL_RELEASE_VERSION(6,1))
#ifndef NO_WARNING
#warning "Current Kernel is too old. Function of performance counters is not available."
#endif
#else
#include <linux/perf_event.h>
#define GTP_PERF_EVENTS
#endif
#else
#ifndef NO_WARNING
#warning "Current Kernel doesn't open CONFIG_PERF_EVENTS. Function of performance counters is not available."
#endif
#endif
/* Handle KGTP_API_VERSION for the special kernel that include KGTP_API. */
#ifdef KGTP_API_VERSION
#define KGTP_API_VERSION_LOCAL KGTP_API_VERSION
#else
#define KGTP_API_VERSION_LOCAL 0
#endif
#ifndef __percpu
#define __percpu
#endif
#ifndef this_cpu_ptr
#define this_cpu_ptr(v) per_cpu_ptr(v, smp_processor_id())
#endif
#define KERN_NULL
/* check ---------------------------------------------------------- */
#ifndef CONFIG_KPROBES
#ifndef NO_WARNING
#warning "Cannot trace Linux kernel because Linux Kernel config doesn't open KPROBES. Please open it in 'General setup->Kprobes' if you need it."
#endif
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0))
#ifndef CONFIG_UPROBES
#ifndef NO_WARNING
#warning "Cannot trace user program because Linux Kernel config doesn't open UPROBES. Please open it in 'Kernel hacking->Tracers->Enable uprobes-based dynamic events' if you need it."
#endif
#endif
#else
#ifndef NO_WARNING
#warning "Cannot trace user program because the Linux Kernel that older than 3.9 doesn't support UPROBES."
#endif
#endif
#ifdef USE_PROC
#ifndef CONFIG_PROC_FS
#ifndef NO_WARNING
#error "Linux Kernel doesn't support procfs."
#endif
#endif
#else
#ifndef CONFIG_DEBUG_FS
#error "Linux Kernel doesn't support debugfs."
#endif
#endif
#if !defined CONFIG_X86 && !defined CONFIG_MIPS && !defined CONFIG_ARM
#error "KGTP support X86_32, X86_64, MIPS and ARM."
#endif
/* ---------------------------------------------------------------- */
/* Following part is to support old Linux kernel ------------------ */
#ifndef DEFINE_SEMAPHORE
#define DEFINE_SEMAPHORE(name) DECLARE_MUTEX(name)
#endif
#ifndef list_first_entry
#define list_first_entry(ptr, type, member) \
list_entry((ptr)->next, type, member)
#endif
/* ---------------------------------------------------------------- */
#ifdef GTPDEBUG
#define GTP_DEBUG KERN_WARNING
#endif
/* #define GTP_DEBUG_V */
#define GTP_RW_MAX 16384
#define GTP_RW_BUFP_MAX (GTP_RW_MAX - 4 - gtp_rw_size)
#define FID_TYPE unsigned int
#define FID_SIZE sizeof(FID_TYPE)
#define FID(x) (*((FID_TYPE *)x))
enum {
FID_HEAD = 0,
FID_REG,
FID_MEM,
FID_VAR,
FID_END,
FID_PAGE_BEGIN,
FID_PAGE_END,
};
/* GTP_FRAME_SIZE must align with FRAME_ALIGN_SIZE if use GTP_FRAME_SIMPLE. */
#define GTP_FRAME_SIZE 5242880
#if defined(GTP_FRAME_SIMPLE) || defined(GTP_RB)
#define FRAME_ALIGN_SIZE sizeof(unsigned int)
#define FRAME_ALIGN(x) ((x + FRAME_ALIGN_SIZE - 1) \
& (~(FRAME_ALIGN_SIZE - 1)))
#endif
#ifdef GTP_FRAME_SIMPLE
#define GTP_FRAME_HEAD_SIZE (FID_SIZE + sizeof(char *) + sizeof(ULONGEST))
#define GTP_FRAME_REG_SIZE (FID_SIZE + sizeof(char *) \
+ sizeof(struct pt_regs))
#define GTP_FRAME_MEM_SIZE (FID_SIZE + sizeof(char *) \
+ sizeof(struct gtp_frame_mem))
#define GTP_FRAME_VAR_SIZE (FID_SIZE + sizeof(char *) \
+ sizeof(struct gtp_frame_var))
#endif
#ifdef GTP_RB
/* The frame head size: FID_HEAD + count id + frame number + pointer to prev frem */
#define GTP_FRAME_HEAD_SIZE (FID_SIZE + sizeof(u64) + sizeof(ULONGEST) + sizeof(void *))
/* The frame head size: FID_PAGE_BEGIN + count id */
#define GTP_FRAME_PAGE_BEGIN_SIZE (FID_SIZE + sizeof(u64))
#endif
#ifdef GTP_FTRACE_RING_BUFFER
#define GTP_FRAME_HEAD_SIZE (FID_SIZE + sizeof(ULONGEST))
#endif
#if defined(GTP_FTRACE_RING_BUFFER) || defined(GTP_RB)
#define GTP_FRAME_REG_SIZE (FID_SIZE + sizeof(struct pt_regs))
#define GTP_FRAME_MEM_SIZE (FID_SIZE + sizeof(struct gtp_frame_mem))
#define GTP_FRAME_VAR_SIZE (FID_SIZE + sizeof(struct gtp_frame_var))
#endif
#define INT2CHAR(h) ((h) > 9 ? (h) + 'a' - 10 : (h) + '0')
enum {
op_check_add = 0xe0,
op_check_sub,
op_check_mul,
op_check_div_signed,
op_check_div_unsigned,
op_check_rem_signed,
op_check_rem_unsigned,
op_check_lsh,
op_check_rsh_signed,
op_check_rsh_unsigned,
op_check_trace,
op_check_bit_and,
op_check_bit_or,
op_check_bit_xor,
op_check_equal,
op_check_less_signed,
op_check_less_unsigned,
op_check_pop,
op_check_swap,
op_check_if_goto,
op_check_printf, /* XXX: still not used. */
op_trace_printk = 0xfd,
op_trace_quick_printk,
op_tracev_printk,
};
struct action_agent_exp {
unsigned int size;
uint8_t *buf;
int need_var_lock;
};
struct action_m {
int regnum;
CORE_ADDR offset;
size_t size;
};
struct action {
struct list_head node;
unsigned char type;
union {
ULONGEST reg_mask;
struct action_agent_exp exp;
struct action_m m;
} u;
};
struct gtpsrc {
struct gtpsrc *next;
char *src;
};
enum gtp_stop_type {
gtp_stop_normal = 0,
gtp_stop_frame_full,
gtp_stop_efault,
gtp_stop_access_wrong_reg,
gtp_stop_agent_expr_code_error,
gtp_stop_agent_expr_stack_overflow,
};
/* See $current. */
#define GTP_ENTRY_FLAGS_CURRENT_TASK 1
/* This gtp entry is registered inside the system. */
#define GTP_ENTRY_FLAGS_REG 2
/* See $no_self_trace. */
#define GTP_ENTRY_FLAGS_SELF_TRACE 4
/* This gtp entry has passcount. */
#define GTP_ENTRY_FLAGS_HAVE_PASS 8
/* See $printk_level. */
#define GTP_ENTRY_FLAGS_HAVE_PRINTK 16
/* See $kret. */
#define GTP_ENTRY_FLAGS_IS_KRETPROBE 32
enum gtp_entry_type {
/* Kernel tracepoint that use kprobes.
When the gtp_entry is alloced by function gtp_list_add, all
of gtp_entry will set to this type. */
gtp_entry_kprobe = 0,
/* User space program tracepoint that use uprobes.
When KGTP try to register the gtp_entry, when gtp_entry->pid
is not same with gtpd_task->pid (the pid of Kernel), this
gtp_entry will set to this type. */
gtp_entry_uprobe,
/* Watch tracepoint.
When tracepoint action is checked by function gtp_check_setv.
gtp_entry will be set to there types. */
gtp_entry_watch_static,
gtp_entry_watch_dynamic,
};
#define GTP_IS_WATCH(tpe) ((tpe)->type == gtp_entry_watch_static \
|| (tpe)->type == gtp_entry_watch_dynamic)
enum gtp_watch_type {
gtp_watch_exec = 0,
gtp_watch_write = 1,
gtp_watch_read_write = 2,
};
struct gtp_entry {
union gtp_entry_u {
#ifdef CONFIG_KPROBES
/* For gtp_entry_kprobe. */
struct gtp_kp {
struct kretprobe kpret;
struct tasklet_struct stop_tasklet;
struct work_struct stop_work;
} kp;
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0)) && defined CONFIG_UPROBES
/* For gtp_entry_uprobe. */
struct gtp_up {
struct inode *inode;
loff_t offset;
struct uprobe_consumer uc;
} up;
#endif
/* For gtp_entry_watch_static and gtp_entry_watch_dynamic. */
struct {
int type;
int size;
} watch;
} u;
unsigned long flags;
enum gtp_entry_type type;
ULONGEST num;
ULONGEST addr;
/* The actions that set $current help tracepoint get right regs. */
struct action *get_regs;
/* The actions for the condition. */
struct action *cond;
struct list_head action_list;
int step;
struct list_head step_action_list;
atomic_t current_pass;
struct gtpsrc *printk_str;
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,30))
/* This is to enable and disable an tracepoint. */
struct tasklet_struct enable_tasklet;
struct work_struct enable_work;
struct tasklet_struct disable_tasklet;
struct work_struct disable_work;
#endif
enum gtp_stop_type reason;
struct gtp_entry *next;
/* Pid for this tracepoint.
KGTP will use this pid to select Kprobe or Uprobe.
And use this pid to get the inode for Uprobe if need.
In default, this pid will bet set to gtp_current_pid. */
pid_t pid;
int disable;
ULONGEST pass;
struct gtpsrc *src;
/* Sometime, it will not same with action
because action will be deleted. */
struct gtpsrc *action_cmd;
};
struct gtp_frame_mem {
CORE_ADDR addr;
size_t size;
};
struct gtp_frame_var {
unsigned int num;
int64_t val;
};
struct gtpro_entry {
struct gtpro_entry *next;
CORE_ADDR start;
CORE_ADDR end;
};
static pid_t gtp_gtp_pid;
static unsigned int gtp_gtp_pid_count;
static pid_t gtp_gtpframe_pid;
static unsigned int gtp_gtpframe_pid_count;
#if defined(GTP_FTRACE_RING_BUFFER) || defined(GTP_RB)
static pid_t gtp_gtpframe_pipe_pid;
#endif
static struct gtp_entry *gtp_list;
static struct gtp_entry *current_gtp;
static struct gtpsrc *current_gtp_action_cmd;
static struct gtpsrc *current_gtp_src;
static struct workqueue_struct *gtp_wq;
static int gtp_read_ack;
static char *gtp_rw_buf;
static char *gtp_rw_bufp;
static size_t gtp_rw_size;
static int gtp_start;
static int gtp_disconnected_tracing;
static int gtp_circular;
#if defined(GTP_FTRACE_RING_BUFFER) \
&& (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)) \
&& !defined(GTP_SELF_RING_BUFFER)
static int gtp_circular_is_changed;
#endif
static int gtp_cpu_number;
/* Current number in the frame. */
static int gtp_frame_current_num;
/* Current tracepoint id. */
static ULONGEST gtp_frame_current_tpe;
static atomic_t gtp_frame_create;
static char *gtp_frame_file;
static size_t gtp_frame_file_size;
static DECLARE_WAIT_QUEUE_HEAD(gtpframe_wq);
#ifdef GTP_FRAME_SIMPLE
static DEFINE_SPINLOCK(gtp_frame_lock);
static char *gtp_frame;
static char *gtp_frame_r_start;
static char *gtp_frame_w_start;
static char *gtp_frame_end;
static int gtp_frame_is_circular;
static char *gtp_frame_current;
#endif
#ifdef GTP_FTRACE_RING_BUFFER
static struct ring_buffer *gtp_frame;
static struct ring_buffer_iter *gtp_frame_iter[NR_CPUS];
static int gtp_frame_current_cpu;
static u64 gtp_frame_current_clock;
#endif
#if defined(GTP_FTRACE_RING_BUFFER) || defined(GTP_RB)
static DECLARE_WAIT_QUEUE_HEAD(gtpframe_pipe_wq);
static atomic_t gtpframe_pipe_wq_v;
static struct tasklet_struct gtpframe_pipe_wq_tasklet;
#endif
static struct gtpro_entry *gtpro_list;
#define GTP_PRINTF_MAX 256
static DEFINE_PER_CPU(char[GTP_PRINTF_MAX], gtp_printf);
#ifdef CONFIG_X86
static DEFINE_PER_CPU(u64, rdtsc_current);
static DEFINE_PER_CPU(u64, rdtsc_offset);
#endif
static DEFINE_PER_CPU(u64, local_clock_current);
static DEFINE_PER_CPU(u64, local_clock_offset);
static uint64_t gtp_start_last_errno;
static int gtp_start_ignore_error;
static int gtp_pipe_trace;
static int gtp_bt_size;
static int gtp_noack_mode;
static pid_t gtp_current_pid;
/* gtpd_task->pid is used as the pid of Linux kernel. */
static struct task_struct *gtpd_task;
#ifdef CONFIG_X86
/* Following part is for while-stepping. */
struct gtp_step_s {
spinlock_t lock;
int step;
int irq_need_open;
struct gtp_entry *tpe;
};
static DEFINE_PER_CPU(struct gtp_step_s, gtp_step);
#endif
#ifdef CONFIG_X86
static int gtp_have_watch_tracepoint;
static int gtp_have_step;
#endif
#ifdef CONFIG_X86
/* Following part is for watch tracepoint. */
/* This part is X86 special. */
#define HWB_NUM 4
static unsigned long gtp_hwb_drx[HWB_NUM];
static unsigned long gtp_hwb_dr7;
#define GTP_HWB_DR7_DEF (0x400UL)
#define GTP_HWB_DR6_MASK (0xe00fUL)
/* This part is for all the arch. */
struct gtp_hwb_s {
struct list_head node;
/* This is the number of this hardware breakpoint. */
int num;
/* This is the address, size and type of this
hardware breakpoint. */
CORE_ADDR addr;
int size;
int type;
/* The previous of the address that this watch tracepoint
watch on. */
int64_t prev_val;
/* This is the num and address that setup this hardware
breakpoints.
For the static watch, this is the num and address of this
tracepoint.
For the dynamic watch, this is the num and address of
the tracepoint that call $watch_start. */
ULONGEST trace_num;
ULONGEST trace_addr;
unsigned int count;
/* Point to the watchpoint struct.
If NULL, this hardware breakpoint is not used. */
struct gtp_entry *watch;
};
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
static struct hw_breakpoint {
int num;
struct perf_event * __percpu *pev;
} breakinfo[HWB_NUM];
#endif
static struct gtp_hwb_s gtp_hwb[HWB_NUM];
static LIST_HEAD(gtp_hwb_used_list);
static LIST_HEAD(gtp_hwb_unused_list);
static DEFINE_RWLOCK(gtp_hwb_lock);
static unsigned int gtp_hwb_sync_count;
static DEFINE_PER_CPU(unsigned int, gtp_hwb_sync_count_local);
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27))
static DEFINE_PER_CPU(struct cpumask, gtp_hwb_sync_cpu_mask);
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25))
#define gtp_get_debugreg(val, reg) get_debugreg(val, reg)
#define gtp_set_debugreg(val, reg) set_debugreg(val, reg)
#else
#define gtp_get_debugreg(val, reg) \
do { \
switch(reg) { \
case 0: \
get_debugreg(val, 0); \
break; \
case 1: \
get_debugreg(val, 1); \
break; \
case 2: \
get_debugreg(val, 2); \
break; \
case 3: \
get_debugreg(val, 3); \
break; \
} \
} while (0)
static void
gtp_set_debugreg(unsigned long val, int reg)
{
switch(reg) {
case 0:
gtp_set_debugreg(val, 0);
break;
case 1:
gtp_set_debugreg(val, 1);
break;
case 2:
gtp_set_debugreg(val, 2);
break;
case 3:
gtp_set_debugreg(val, 3);
break;
}
}
#endif
static void
gtp_hwb_stop(void *data)
{
read_lock(&gtp_hwb_lock);
__get_cpu_var(gtp_hwb_sync_count_local) = gtp_hwb_sync_count;
gtp_set_debugreg(0UL, 0);
gtp_set_debugreg(0UL, 1);
gtp_set_debugreg(0UL, 2);
gtp_set_debugreg(0UL, 3);
gtp_set_debugreg(GTP_HWB_DR7_DEF, 7);
read_unlock(&gtp_hwb_lock);
}
static void
gtp_hwb_sync_local(void)
{
__get_cpu_var(gtp_hwb_sync_count_local) = gtp_hwb_sync_count;
gtp_set_debugreg(gtp_hwb_drx[0], 0);
gtp_set_debugreg(gtp_hwb_drx[1], 1);
gtp_set_debugreg(gtp_hwb_drx[2], 2);
gtp_set_debugreg(gtp_hwb_drx[3], 3);
gtp_set_debugreg(gtp_hwb_dr7, 7);
}
static void
gtp_hwb_sync(void *data)
{
gtp_hwb_sync_local();
}
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27))
static int
gtp_ipi_handler(struct kprobe *p, struct pt_regs *regs)
{
read_lock(&gtp_hwb_lock);
if (__get_cpu_var(gtp_hwb_sync_count_local) != gtp_hwb_sync_count)
gtp_hwb_sync_local();
read_unlock(&gtp_hwb_lock);
return 0;
}
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27))
static struct kprobe gtp_ipi_kp;
#endif
#endif
static char *
string2hex(char *pkg, char *out)
{
char *ret = out;
while (pkg[0]) {
sprintf(out, "%02x", pkg[0]);
pkg++;
out += 2;
}
out[0] = '\0';
return ret;
}
/* Strdup begin. If end is not NULL, it point to the end of this dup. */
static char *
gtp_strdup(char *begin, char *end)
{
int len;
char *ret;
if (end)
len = end - begin;
else
len = strlen(begin);
ret = kmalloc(len + 1, GFP_KERNEL);
if (ret == NULL)
return NULL;
strncpy(ret, begin, len);
ret[len] = '\0';
return ret;
}
/* Following part is for GTP_LOCAL_CLOCK. */
#define GTP_LOCAL_CLOCK gtp_local_clock()
#ifdef GTP_CLOCK_CYCLE
static unsigned long long
gtp_local_clock(void)
{
#ifdef CONFIG_X86
unsigned long long a;
rdtscll(a);
return a;
#else
#error "This ARCH cannot get cycle."
#endif
}
#else
static unsigned long long
gtp_local_clock(void)
{