include/asm-xtensa/ptrace.h

   1 /*
   2  * include/asm-xtensa/ptrace.h
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 2001 - 2005 Tensilica Inc.
   9  */
  10
  11 #ifndef _XTENSA_PTRACE_H
  12 #define _XTENSA_PTRACE_H
  13
  14 /*
  15  * Kernel stack
  16  *
  17  *              +-----------------------+  -------- STACK_SIZE
  18  *              |     register file     |  |
  19  *              +-----------------------+  |
  20  *              |    struct pt_regs     |  |
  21  *              +-----------------------+  | ------ PT_REGS_OFFSET
  22  * double       :  16 bytes spill area  :  |  ^
  23  * excetion     :- - - - - - - - - - - -:  |  |
  24  * frame        :    struct pt_regs     :  |  |
  25  *              :- - - - - - - - - - - -:  |  |
  26  *              |                       |  |  |
  27  *              |     memory stack      |  |  |
  28  *              |                       |  |  |
  29  *              ~                       ~  ~  ~
  30  *              ~                       ~  ~  ~
  31  *              |                       |  |  |
  32  *              |                       |  |  |
  33  *              +-----------------------+  |  | --- STACK_BIAS
  34  *              |  struct task_struct   |  |  |  ^
  35  *  current --> +-----------------------+  |  |  |
  36  *              |  struct thread_info   |  |  |  |
  37  *              +-----------------------+ --------
  38  */
  39
  40 #define KERNEL_STACK_SIZE (2 * PAGE_SIZE)
  41
  42 /*  Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables). */
  43
  44 #define EXC_TABLE_KSTK          0x004   /* Kernel Stack */
  45 #define EXC_TABLE_DOUBLE_SAVE   0x008   /* Double exception save area for a0 */
  46 #define EXC_TABLE_FIXUP         0x00c   /* Fixup handler */
  47 #define EXC_TABLE_PARAM         0x010   /* For passing a parameter to fixup */
  48 #define EXC_TABLE_SYSCALL_SAVE  0x014   /* For fast syscall handler */
  49 #define EXC_TABLE_FAST_USER     0x100   /* Fast user exception handler */
  50 #define EXC_TABLE_FAST_KERNEL   0x200   /* Fast kernel exception handler */
  51 #define EXC_TABLE_DEFAULT       0x300   /* Default C-Handler */
  52 #define EXC_TABLE_SIZE          0x400
  53
  54 /* Registers used by strace */
  55
  56 #define REG_A_BASE      0x0000
  57 #define REG_AR_BASE     0x0100
  58 #define REG_PC          0x0020
  59 #define REG_PS          0x02e6
  60 #define REG_WB          0x0248
  61 #define REG_WS          0x0249
  62 #define REG_LBEG        0x0200
  63 #define REG_LEND        0x0201
  64 #define REG_LCOUNT      0x0202
  65 #define REG_SAR         0x0203
  66
  67 #define SYSCALL_NR      0x00ff
  68
  69 /* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */
  70
  71 #define PTRACE_GETREGS          12
  72 #define PTRACE_SETREGS          13
  73 #define PTRACE_GETXTREGS        18
  74 #define PTRACE_SETXTREGS        19
  75
  76 #ifdef __KERNEL__
  77
  78 #ifndef __ASSEMBLY__
  79
  80 /*
  81  * This struct defines the way the registers are stored on the
  82  * kernel stack during a system call or other kernel entry.
  83  */
  84 struct pt_regs {
  85         unsigned long pc;               /*   4 */
  86         unsigned long ps;               /*   8 */
  87         unsigned long depc;             /*  12 */
  88         unsigned long exccause;         /*  16 */
  89         unsigned long excvaddr;         /*  20 */
  90         unsigned long debugcause;       /*  24 */
  91         unsigned long wmask;            /*  28 */
  92         unsigned long lbeg;             /*  32 */
  93         unsigned long lend;             /*  36 */
  94         unsigned long lcount;           /*  40 */
  95         unsigned long sar;              /*  44 */
  96         unsigned long windowbase;       /*  48 */
  97         unsigned long windowstart;      /*  52 */
  98         unsigned long syscall;          /*  56 */
  99         unsigned long icountlevel;      /*  60 */
 100         int reserved[1];                /*  64 */
 101
 102         /* Additional configurable registers that are used by the compiler. */
 103         xtregs_opt_t xtregs_opt;
 104
 105         /* Make sure the areg field is 16 bytes aligned. */
 106         int align[0] __attribute__ ((aligned(16)));
 107
 108         /* current register frame.
 109          * Note: The ESF for kernel exceptions ends after 16 registers!
 110          */
 111         unsigned long areg[16];         /* 128 (64) */
 112 };
 113
 114 #include <asm/variant/core.h>
 115
 116 # define task_pt_regs(tsk) ((struct pt_regs*) \
 117   (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1)
 118 # define user_mode(regs) (((regs)->ps & 0x00000020)!=0)
 119 # define instruction_pointer(regs) ((regs)->pc)
 120 extern void show_regs(struct pt_regs *);
 121
 122 # ifndef CONFIG_SMP
 123 #  define profile_pc(regs) instruction_pointer(regs)
 124 # endif
 125
 126 #else   /* __ASSEMBLY__ */
 127
 128 # include <asm/asm-offsets.h>
 129 #define PT_REGS_OFFSET    (KERNEL_STACK_SIZE - PT_USER_SIZE)
 130
 131 #endif  /* !__ASSEMBLY__ */
 132
 133 #endif  /* __KERNEL__ */
 134
 135 #endif  /* _XTENSA_PTRACE_H */