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#ifndef _XTENSA_PTRACE_H
 11#define _XTENSA_PTRACE_H
 12
 13#include <asm/kmem_layout.h>
 14#include <uapi/asm/ptrace.h>
 15
 16/*
 17 * Kernel stack
 18 *
 19 *		+-----------------------+  -------- STACK_SIZE
 20 *		|     register file     |  |
 21 *		+-----------------------+  |
 22 *		|    struct pt_regs     |  |
 23 *		+-----------------------+  | ------ PT_REGS_OFFSET
 24 * double	:  16 bytes spill area  :  |  ^
 25 * excetion	:- - - - - - - - - - - -:  |  |
 26 * frame	:    struct pt_regs     :  |  |
 27 *		:- - - - - - - - - - - -:  |  |
 28 *		|                       |  |  |
 29 *		|     memory stack      |  |  |
 30 *		|                       |  |  |
 31 *		~                       ~  ~  ~
 32 *		~                       ~  ~  ~
 33 *		|                       |  |  |
 34 *		|                       |  |  |
 35 *		+-----------------------+  |  | --- STACK_BIAS
 36 *		|  struct task_struct   |  |  |  ^
 37 *  current --> +-----------------------+  |  |  |
 38 *		|  struct thread_info   |  |  |  |
 39 *		+-----------------------+ --------
 40 */
 41
 42#define NO_SYSCALL (-1)
 43
 44#ifndef __ASSEMBLER__
 45
 46#include <asm/coprocessor.h>
 47#include <asm/core.h>
 48
 49/*
 50 * This struct defines the way the registers are stored on the
 51 * kernel stack during a system call or other kernel entry.
 52 */
 53struct pt_regs {
 54	unsigned long pc;		/*   4 */
 55	unsigned long ps;		/*   8 */
 56	unsigned long depc;		/*  12 */
 57	unsigned long exccause;		/*  16 */
 58	unsigned long excvaddr;		/*  20 */
 59	unsigned long debugcause;	/*  24 */
 60	unsigned long wmask;		/*  28 */
 61	unsigned long lbeg;		/*  32 */
 62	unsigned long lend;		/*  36 */
 63	unsigned long lcount;		/*  40 */
 64	unsigned long sar;		/*  44 */
 65	unsigned long windowbase;	/*  48 */
 66	unsigned long windowstart;	/*  52 */
 67	unsigned long syscall;		/*  56 */
 68	unsigned long icountlevel;	/*  60 */
 69	unsigned long scompare1;	/*  64 */
 70	unsigned long threadptr;	/*  68 */
 71
 72	/* Additional configurable registers that are used by the compiler. */
 73	xtregs_opt_t xtregs_opt;
 74
 75	/* current register frame.
 76	 * Note: The ESF for kernel exceptions ends after 16 registers!
 77	 */
 78	unsigned long areg[XCHAL_NUM_AREGS] __aligned(16);
 79};
 80
 81# define arch_has_single_step()	(1)
 82# define task_pt_regs(tsk) ((struct pt_regs*) \
 83	(task_stack_page(tsk) + KERNEL_STACK_SIZE) - 1)
 84# define user_mode(regs) (((regs)->ps & 0x00000020)!=0)
 85# define instruction_pointer(regs) ((regs)->pc)
 86# define return_pointer(regs) (MAKE_PC_FROM_RA((regs)->areg[0], \
 87					       (regs)->pc))
 88
 89# ifndef CONFIG_SMP
 90#  define profile_pc(regs) instruction_pointer(regs)
 91# else
 92#  define profile_pc(regs)						\
 93	({								\
 94		in_lock_functions(instruction_pointer(regs)) ?		\
 95		return_pointer(regs) : instruction_pointer(regs);	\
 96	})
 97# endif
 98
 99#define user_stack_pointer(regs) ((regs)->areg[1])
100
101static inline unsigned long regs_return_value(struct pt_regs *regs)
102{
103	return regs->areg[2];
104}
105
106int do_syscall_trace_enter(struct pt_regs *regs);
107void do_syscall_trace_leave(struct pt_regs *regs);
108
109#else	/* __ASSEMBLER__ */
110
111# include <asm/asm-offsets.h>
112#define PT_REGS_OFFSET	  (KERNEL_STACK_SIZE - PT_USER_SIZE)
113
114#endif	/* !__ASSEMBLER__ */
115
116#endif	/* _XTENSA_PTRACE_H */