arch/tile/include/asm/ptrace.h

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 #ifndef _ASM_TILE_PTRACE_H
  16 #define _ASM_TILE_PTRACE_H
  17
  18 #include <arch/chip.h>
  19 #include <arch/abi.h>
  20
  21 /* These must match struct pt_regs, below. */
  22 #if CHIP_WORD_SIZE() == 32
  23 #define PTREGS_OFFSET_REG(n)    ((n)*4)
  24 #else
  25 #define PTREGS_OFFSET_REG(n)    ((n)*8)
  26 #endif
  27 #define PTREGS_OFFSET_BASE      0
  28 #define PTREGS_OFFSET_TP        PTREGS_OFFSET_REG(53)
  29 #define PTREGS_OFFSET_SP        PTREGS_OFFSET_REG(54)
  30 #define PTREGS_OFFSET_LR        PTREGS_OFFSET_REG(55)
  31 #define PTREGS_NR_GPRS          56
  32 #define PTREGS_OFFSET_PC        PTREGS_OFFSET_REG(56)
  33 #define PTREGS_OFFSET_EX1       PTREGS_OFFSET_REG(57)
  34 #define PTREGS_OFFSET_FAULTNUM  PTREGS_OFFSET_REG(58)
  35 #define PTREGS_OFFSET_ORIG_R0   PTREGS_OFFSET_REG(59)
  36 #define PTREGS_OFFSET_FLAGS     PTREGS_OFFSET_REG(60)
  37 #if CHIP_HAS_CMPEXCH()
  38 #define PTREGS_OFFSET_CMPEXCH   PTREGS_OFFSET_REG(61)
  39 #endif
  40 #define PTREGS_SIZE             PTREGS_OFFSET_REG(64)
  41
  42 #ifndef __ASSEMBLY__
  43
  44 #ifdef __KERNEL__
  45 /* Benefit from consistent use of "long" on all chips. */
  46 typedef unsigned long pt_reg_t;
  47 #else
  48 /* Provide appropriate length type to userspace regardless of -m32/-m64. */
  49 typedef uint_reg_t pt_reg_t;
  50 #endif
  51
  52 /*
  53  * This struct defines the way the registers are stored on the stack during a
  54  * system call or exception.  "struct sigcontext" has the same shape.
  55  */
  56 struct pt_regs {
  57         /* Saved main processor registers; 56..63 are special. */
  58         /* tp, sp, and lr must immediately follow regs[] for aliasing. */
  59         pt_reg_t regs[53];
  60         pt_reg_t tp;            /* aliases regs[TREG_TP] */
  61         pt_reg_t sp;            /* aliases regs[TREG_SP] */
  62         pt_reg_t lr;            /* aliases regs[TREG_LR] */
  63
  64         /* Saved special registers. */
  65         pt_reg_t pc;            /* stored in EX_CONTEXT_K_0 */
  66         pt_reg_t ex1;           /* stored in EX_CONTEXT_K_1 (PL and ICS bit) */
  67         pt_reg_t faultnum;      /* fault number (INT_SWINT_1 for syscall) */
  68         pt_reg_t orig_r0;       /* r0 at syscall entry, else zero */
  69         pt_reg_t flags;         /* flags (see below) */
  70 #if !CHIP_HAS_CMPEXCH()
  71         pt_reg_t pad[3];
  72 #else
  73         pt_reg_t cmpexch;       /* value of CMPEXCH_VALUE SPR at interrupt */
  74         pt_reg_t pad[2];
  75 #endif
  76 };
  77
  78 #endif /* __ASSEMBLY__ */
  79
  80 #define PTRACE_GETREGS          12
  81 #define PTRACE_SETREGS          13
  82 #define PTRACE_GETFPREGS        14
  83 #define PTRACE_SETFPREGS        15
  84
  85 /* Support TILE-specific ptrace options, with events starting at 16. */
  86 #define PTRACE_O_TRACEMIGRATE   0x00010000
  87 #define PTRACE_EVENT_MIGRATE    16
  88 #ifdef __KERNEL__
  89 #define PTRACE_O_MASK_TILE      (PTRACE_O_TRACEMIGRATE)
  90 #define PT_TRACE_MIGRATE        0x00080000
  91 #define PT_TRACE_MASK_TILE      (PT_TRACE_MIGRATE)
  92 #endif
  93
  94 #ifdef __KERNEL__
  95
  96 /* Flag bits in pt_regs.flags */
  97 #define PT_FLAGS_DISABLE_IRQ    1  /* on return to kernel, disable irqs */
  98 #define PT_FLAGS_CALLER_SAVES   2  /* caller-save registers are valid */
  99 #define PT_FLAGS_RESTORE_REGS   4  /* restore callee-save regs on return */
 100
 101 #ifndef __ASSEMBLY__
 102
 103 #define instruction_pointer(regs) ((regs)->pc)
 104 #define profile_pc(regs) instruction_pointer(regs)
 105
 106 /* Does the process account for user or for system time? */
 107 #define user_mode(regs) (EX1_PL((regs)->ex1) == USER_PL)
 108
 109 /* Fill in a struct pt_regs with the current kernel registers. */
 110 struct pt_regs *get_pt_regs(struct pt_regs *);
 111
 112 /* Trace the current syscall. */
 113 extern void do_syscall_trace(void);
 114
 115 #define arch_has_single_step()  (1)
 116
 117 /*
 118  * A structure for all single-stepper state.
 119  *
 120  * Also update defines in assembler section if it changes
 121  */
 122 struct single_step_state {
 123         /* the page to which we will write hacked-up bundles */
 124         void __user *buffer;
 125
 126         union {
 127                 int flags;
 128                 struct {
 129                         unsigned long is_enabled:1, update:1, update_reg:6;
 130                 };
 131         };
 132
 133         unsigned long orig_pc;          /* the original PC */
 134         unsigned long next_pc;          /* return PC if no branch (PC + 1) */
 135         unsigned long branch_next_pc;   /* return PC if we did branch/jump */
 136         unsigned long update_value;     /* value to restore to update_target */
 137 };
 138
 139 /* Single-step the instruction at regs->pc */
 140 extern void single_step_once(struct pt_regs *regs);
 141
 142 /* Clean up after execve(). */
 143 extern void single_step_execve(void);
 144
 145 struct task_struct;
 146
 147 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
 148                          int error_code);
 149
 150 #ifdef __tilegx__
 151 /* We need this since sigval_t has a user pointer in it, for GETSIGINFO etc. */
 152 #define __ARCH_WANT_COMPAT_SYS_PTRACE
 153 #endif
 154
 155 #endif /* !__ASSEMBLY__ */
 156
 157 #define SINGLESTEP_STATE_MASK_IS_ENABLED      0x1
 158 #define SINGLESTEP_STATE_MASK_UPDATE          0x2
 159 #define SINGLESTEP_STATE_TARGET_LB              2
 160 #define SINGLESTEP_STATE_TARGET_UB              7
 161
 162 #endif /* !__KERNEL__ */
 163
 164 #endif /* _ASM_TILE_PTRACE_H */