LXR linux/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. */
  21typedef 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 regs_return_value(regs) ((regs)->regs[0])
  37#define instruction_pointer(regs) ((regs)->pc)
  38#define profile_pc(regs) instruction_pointer(regs)
  39#define user_stack_pointer(regs) ((regs)->sp)
  40
  41/* Does the process account for user or for system time? */
  42#define user_mode(regs) (EX1_PL((regs)->ex1) < KERNEL_PL)
  43
  44/* Fill in a struct pt_regs with the current kernel registers. */
  45struct pt_regs *get_pt_regs(struct pt_regs *);
  46
  47/* Trace the current syscall. */
  48extern int do_syscall_trace_enter(struct pt_regs *regs);
  49extern void do_syscall_trace_exit(struct pt_regs *regs);
  50
  51#define arch_has_single_step()  (1)
  52
  53/*
  54 * A structure for all single-stepper state.
  55 *
  56 * Also update defines in assembler section if it changes
  57 */
  58struct single_step_state {
  59        /* the page to which we will write hacked-up bundles */
  60        void __user *buffer;
  61
  62        union {
  63                int flags;
  64                struct {
  65                        unsigned long is_enabled:1, update:1, update_reg:6;
  66                };
  67        };
  68
  69        unsigned long orig_pc;          /* the original PC */
  70        unsigned long next_pc;          /* return PC if no branch (PC + 1) */
  71        unsigned long branch_next_pc;   /* return PC if we did branch/jump */
  72        unsigned long update_value;     /* value to restore to update_target */
  73};
  74
  75/* Single-step the instruction at regs->pc */
  76extern void single_step_once(struct pt_regs *regs);
  77
  78/* Clean up after execve(). */
  79extern void single_step_execve(void);
  80
  81struct task_struct;
  82
  83extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs);
  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 */
  98