include/hw/android/goldfish/trace.h

/* Copyright (C) 2007-2008 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** 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.
*/
#ifndef _TRACE_DEV_H_
#define _TRACE_DEV_H_

#include "hw/android/goldfish/device.h"
#include "cpu.h"

#define CLIENT_PAGE_SIZE        4096

/* trace device registers */

/* The indices below all corresponds to slots that can only be accessed
 * by the guest kernel. See below for indices reachable from the guest
 * user-land.
 */
#define TRACE_DEV_REG_SWITCH            0
#define TRACE_DEV_REG_FORK              1
#define TRACE_DEV_REG_EXECVE_PID        2
#define TRACE_DEV_REG_EXECVE_VMSTART    3
#define TRACE_DEV_REG_EXECVE_VMEND      4
#define TRACE_DEV_REG_EXECVE_OFFSET     5
#define TRACE_DEV_REG_EXECVE_EXEPATH    6
#define TRACE_DEV_REG_EXIT              7
#define TRACE_DEV_REG_CMDLINE           8
#define TRACE_DEV_REG_CMDLINE_LEN       9
#define TRACE_DEV_REG_MMAP_EXEPATH      10
#define TRACE_DEV_REG_INIT_PID          11
#define TRACE_DEV_REG_INIT_NAME         12
#define TRACE_DEV_REG_CLONE             13
#define TRACE_DEV_REG_UNMAP_START       14
#define TRACE_DEV_REG_UNMAP_END         15
#define TRACE_DEV_REG_NAME              16
#define TRACE_DEV_REG_TGID              17
#define TRACE_DEV_REG_DYN_SYM           50
#define TRACE_DEV_REG_DYN_SYM_ADDR      51
#define TRACE_DEV_REG_REMOVE_ADDR       52
#define TRACE_DEV_REG_PRINT_STR         60
#define TRACE_DEV_REG_PRINT_NUM_DEC     61
#define TRACE_DEV_REG_PRINT_NUM_HEX     62
#define TRACE_DEV_REG_STOP_EMU          90
#define TRACE_DEV_REG_ENABLE            100

/* NOTE: The device's second physical page is mapped to /dev/qemu_trace
 *        This means that if you do the following:
 *
 *           magicPage = my_mmap("/dev/qemu_trace", ...);
 *           *(uint32_t*)magicPage[index] = value;
 *
 *        The write at address magicPage+index*4 here will be seen
 *        by the device as a write to the i/o offset 4096 + index*4,
 *        i.e. (1024 + index)*4.
 *
 *        As a consequence, any index defined below corresponds to
 *        location (index-1024)*4 in the mmapped page in the guest.
 */

/* The first 64 entries are reserved for VM instrumentation */
#define TRACE_DEV_REG_METHOD_ENTRY      1024
#define TRACE_DEV_REG_METHOD_EXIT       1025
#define TRACE_DEV_REG_METHOD_EXCEPTION  1026
#define TRACE_DEV_REG_NATIVE_ENTRY      1028
#define TRACE_DEV_REG_NATIVE_EXIT       1029
#define TRACE_DEV_REG_NATIVE_EXCEPTION  1030

/* Next, QEMUD fast pipes */
#define TRACE_DEV_PIPE_BASE             1280    /* 1024 + (64*4) */
#define TRACE_DEV_PIPE_COMMAND          (TRACE_DEV_PIPE_BASE + 0)
#define TRACE_DEV_PIPE_STATUS           (TRACE_DEV_PIPE_BASE + 0)
#define TRACE_DEV_PIPE_ADDRESS          (TRACE_DEV_PIPE_BASE + 1)
#define TRACE_DEV_PIPE_SIZE             (TRACE_DEV_PIPE_BASE + 2)
#define TRACE_DEV_PIPE_CHANNEL          (TRACE_DEV_PIPE_BASE + 3)

/* These entries are reserved for libc instrumentation, i.e. memcheck */
#if 0  /* see memcheck_common.h */
#define TRACE_DEV_REG_MEMCHECK              1536  /* 1024 + (128*4) */
#define TRACE_DEV_REG_LIBC_INIT             (TRACE_DEV_REG_MEMCHECK + MEMCHECK_EVENT_LIBC_INIT)
#define TRACE_DEV_REG_MALLOC                (TRACE_DEV_REG_MEMCHECK + MEMCHECK_EVENT_MALLOC)
#define TRACE_DEV_REG_FREE_PTR              (TRACE_DEV_REG_MEMCHECK + MEMCHECK_EVENT_FREE_PTR)
#define TRACE_DEV_REG_QUERY_MALLOC          (TRACE_DEV_REG_MEMCHECK + MEMCHECK_EVENT_QUERY_MALLOC)
#define TRACE_DEV_REG_PRINT_USER_STR        (TRACE_DEV_REG_MEMCHECK + MEMCHECK_EVENT_PRINT_USER_STR)
#endif

/* the virtual trace device state */
typedef struct {
    struct goldfish_device dev;
} trace_dev_state;

/*
 * interfaces for copy from virtual space
 * from target-arm/op_helper.c
 */
extern void vstrcpy(target_ulong ptr, char *buf, int max);

/*
 * interfaces to trace module to signal kernel events
 */
extern void trace_switch(int pid);
extern void trace_fork(int tgid, int pid);
extern void trace_clone(int tgid, int pid);
extern void trace_execve(const char *arg, int len);
extern void trace_exit(int exitcode);
extern void trace_mmap(unsigned long vstart, unsigned long vend,
                       unsigned long offset, const char *path);
extern void trace_munmap(unsigned long vstart, unsigned long vend);
extern void trace_dynamic_symbol_add(unsigned long vaddr, const char *name);
extern void trace_dynamic_symbol_remove(unsigned long vaddr);
extern void trace_init_name(int tgid, int pid, const char *name);
extern void trace_init_exec(unsigned long start, unsigned long end,
                            unsigned long offset, const char *exe);
extern void start_tracing(void);
extern void stop_tracing(void);
extern void trace_exception(uint32 target_pc);

#endif