LXR uboot/arch/xtensa/include/asm/ptrace.h

   1/*
   2 * Copyright (C) 2001 - 2007 Tensilica Inc.
   3 *
   4 * SPDX-License-Identifier:     GPL-2.0+
   5 */
   6
   7#ifndef _XTENSA_PTRACE_H
   8#define _XTENSA_PTRACE_H
   9
  10#include <compiler.h>
  11
  12/*
  13 * Kernel stack
  14 *
  15 *              +-----------------------+  -------- STACK_SIZE
  16 *              |     register file     |  |
  17 *              +-----------------------+  |
  18 *              |    struct pt_regs     |  |
  19 *              +-----------------------+  | ------ PT_REGS_OFFSET
  20 * double       :  16 bytes spill area  :  |  ^
  21 * exception    :- - - - - - - - - - - -:  |  |
  22 * frame        :    struct pt_regs     :  |  |
  23 *              :- - - - - - - - - - - -:  |  |
  24 *              |                       |  |  |
  25 *              |     memory stack      |  |  |
  26 *              |                       |  |  |
  27 *              ~                       ~  ~  ~
  28 *              ~                       ~  ~  ~
  29 *              |                       |  |  |
  30 *              |                       |  |  |
  31 *              +-----------------------+  |  | --- STACK_BIAS
  32 *              |  struct task_struct   |  |  |  ^
  33 *  current --> +-----------------------+  |  |  |
  34 *              |  struct thread_info   |  |  |  |
  35 *              +-----------------------+ --------
  36 */
  37
  38#define KERNEL_STACK_SIZE (2 * PAGE_SIZE)
  39
  40/*  Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables) */
  41
  42#define EXC_TABLE_KSTK          0x004   /* Kernel Stack */
  43#define EXC_TABLE_DOUBLE_SAVE   0x008   /* Double exception save area for a0 */
  44#define EXC_TABLE_FIXUP         0x00c   /* Fixup handler */
  45#define EXC_TABLE_PARAM         0x010   /* For passing a parameter to fixup */
  46#define EXC_TABLE_SYSCALL_SAVE  0x014   /* For fast syscall handler */
  47#define EXC_TABLE_FAST_USER     0x100   /* Fast user exception handler */
  48#define EXC_TABLE_FAST_KERNEL   0x200   /* Fast kernel exception handler */
  49#define EXC_TABLE_DEFAULT       0x300   /* Default C-Handler */
  50#define EXC_TABLE_SIZE          0x400
  51
  52/* Registers used by strace */
  53
  54#define REG_A_BASE      0xfc000000
  55#define REG_AR_BASE     0x04000000
  56#define REG_PC          0x14000000
  57#define REG_PS          0x080000e6
  58#define REG_WB          0x08000048
  59#define REG_WS          0x08000049
  60#define REG_LBEG        0x08000000
  61#define REG_LEND        0x08000001
  62#define REG_LCOUNT      0x08000002
  63#define REG_SAR         0x08000003
  64#define REG_DEPC        0x080000c0
  65#define REG_EXCCAUSE    0x080000e8
  66#define REG_EXCVADDR    0x080000ee
  67#define SYSCALL_NR      0x1
  68
  69#define AR_REGNO_TO_A_REGNO(ar, wb) (ar - wb*4) & ~(XCHAL_NUM_AREGS - 1)
  70
  71/* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */
  72
  73#define PTRACE_GETREGS            12
  74#define PTRACE_SETREGS            13
  75#define PTRACE_GETFPREGS          14
  76#define PTRACE_SETFPREGS          15
  77#define PTRACE_GETFPREGSIZE       18
  78
  79#ifndef __ASSEMBLY__
  80
  81/*
  82 * This struct defines the way the registers are stored on the
  83 * kernel stack during a system call or other kernel entry.
  84 */
  85struct pt_regs {
  86        unsigned long pc;               /*   4 */
  87        unsigned long ps;               /*   8 */
  88        unsigned long depc;             /*  12 */
  89        unsigned long exccause;         /*  16 */
  90        unsigned long excvaddr;         /*  20 */
  91        unsigned long debugcause;       /*  24 */
  92        unsigned long wmask;            /*  28 */
  93        unsigned long lbeg;             /*  32 */
  94        unsigned long lend;             /*  36 */
  95        unsigned long lcount;           /*  40 */
  96        unsigned long sar;              /*  44 */
  97        unsigned long windowbase;       /*  48 */
  98        unsigned long windowstart;      /*  52 */
  99        unsigned long syscall;          /*  56 */
 100        unsigned long icountlevel;      /*  60 */
 101        int reserved[1];                /*  64 */
 102
 103        /* Make sure the areg field is 16 bytes aligned */
 104        int align[0] __aligned(16);
 105
 106        /* current register frame.
 107         * Note: The ESF for kernel exceptions ends after 16 registers!
 108         */
 109        unsigned long areg[16];         /* 128 (64) */
 110};
 111
 112#ifdef __KERNEL__
 113
 114# define task_pt_regs(tsk) ((struct pt_regs *) \
 115        (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1)
 116# define user_mode(regs) (((regs)->ps & 0x00000020) != 0)
 117# define instruction_pointer(regs) ((regs)->pc)
 118void show_regs(struct pt_regs *);
 119
 120# ifndef CONFIG_SMP
 121#  define profile_pc(regs) instruction_pointer(regs)
 122# endif
 123#endif /* __KERNEL__ */
 124
 125#else   /* __ASSEMBLY__ */
 126
 127#ifdef __KERNEL__
 128# include <asm/asm-offsets.h>
 129#define PT_REGS_OFFSET    (KERNEL_STACK_SIZE - PT_USER_SIZE)
 130#endif
 131
 132#endif  /* !__ASSEMBLY__ */
 133#endif  /* _XTENSA_PTRACE_H */
 134