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 #ifndef _ASM_TILE_PTRACE_H
  15 #define _ASM_TILE_PTRACE_H
  16
  17 #include <linux/compiler.h>
  18
  19 #ifndef __ASSEMBLY__
  20 /* Benefit from consistent use of "long" on all chips. */
  21 typedef unsigned long pt_reg_t;
  22 #endif
  23
  24 #include <uapi/asm/ptrace.h>
  25
  26 #define PTRACE_O_MASK_TILE      (PTRACE_O_TRACEMIGRATE)
  27 #define PT_TRACE_MIGRATE        PT_EVENT_FLAG(PTRACE_EVENT_MIGRATE)
  28
  29 /* Flag bits in pt_regs.flags */
  30 #define PT_FLAGS_DISABLE_IRQ    1  /* on return to kernel, disable irqs */
  31 #define PT_FLAGS_CALLER_SAVES   2  /* caller-save registers are valid */
  32 #define PT_FLAGS_RESTORE_REGS   4  /* restore callee-save regs on return */
  33
  34 #ifndef __ASSEMBLY__
  35
  36 #define instruction_pointer(regs) ((regs)->pc)
  37 #define profile_pc(regs) instruction_pointer(regs)
  38 #define user_stack_pointer(regs) ((regs)->sp)
  39
  40 /* Does the process account for user or for system time? */
  41 #define user_mode(regs) (EX1_PL((regs)->ex1) == USER_PL)
  42
  43 /* Fill in a struct pt_regs with the current kernel registers. */
  44 struct pt_regs *get_pt_regs(struct pt_regs *);
  45
  46 /* Trace the current syscall. */
  47 extern int do_syscall_trace_enter(struct pt_regs *regs);
  48 extern void do_syscall_trace_exit(struct pt_regs *regs);
  49
  50 #define arch_has_single_step()  (1)
  51
  52 /*
  53  * A structure for all single-stepper state.
  54  *
  55  * Also update defines in assembler section if it changes
  56  */
  57 struct single_step_state {
  58         /* the page to which we will write hacked-up bundles */
  59         void __user *buffer;
  60
  61         union {
  62                 int flags;
  63                 struct {
  64                         unsigned long is_enabled:1, update:1, update_reg:6;
  65                 };
  66         };
  67
  68         unsigned long orig_pc;          /* the original PC */
  69         unsigned long next_pc;          /* return PC if no branch (PC + 1) */
  70         unsigned long branch_next_pc;   /* return PC if we did branch/jump */
  71         unsigned long update_value;     /* value to restore to update_target */
  72 };
  73
  74 /* Single-step the instruction at regs->pc */
  75 extern void single_step_once(struct pt_regs *regs);
  76
  77 /* Clean up after execve(). */
  78 extern void single_step_execve(void);
  79
  80 struct task_struct;
  81
  82 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
  83                          int error_code);
  84
  85 #ifdef __tilegx__
  86 /* We need this since sigval_t has a user pointer in it, for GETSIGINFO etc. */
  87 #define __ARCH_WANT_COMPAT_SYS_PTRACE
  88 #endif
  89
  90 #endif /* !__ASSEMBLY__ */
  91
  92 #define SINGLESTEP_STATE_MASK_IS_ENABLED      0x1
  93 #define SINGLESTEP_STATE_MASK_UPDATE          0x2
  94 #define SINGLESTEP_STATE_TARGET_LB              2
  95 #define SINGLESTEP_STATE_TARGET_UB              7
  96
  97 #endif /* _ASM_TILE_PTRACE_H */