ptrace.h

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/*
 * include/asm-xtensa/ptrace.h
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2005 Tensilica Inc.
 */

#ifndef _UAPI_XTENSA_PTRACE_H
#define _UAPI_XTENSA_PTRACE_H

/*
 * Kernel stack
 *
 *      +-----------------------+  -------- STACK_SIZE
 *      |     register file     |  |
 *      +-----------------------+  |
 *      |    struct pt_regs     |  |
 *      +-----------------------+  | ------ PT_REGS_OFFSET
 * double   :  16 bytes spill area  :  |  ^
 * excetion     :- - - - - - - - - - - -:  |  |
 * frame    :    struct pt_regs     :  |  |
 *      :- - - - - - - - - - - -:  |  |
 *      |                       |  |  |
 *      |     memory stack      |  |  |
 *      |                       |  |  |
 *      ~                       ~  ~  ~
 *      ~                       ~  ~  ~
 *      |                       |  |  |
 *      |                       |  |  |
 *      +-----------------------+  |  | --- STACK_BIAS
 *      |  struct task_struct   |  |  |  ^
 *  current --> +-----------------------+  |  |  |
 *      |  struct thread_info   |  |  |  |
 *      +-----------------------+ --------
 */

#define KERNEL_STACK_SIZE (2 * PAGE_SIZE)

/*  Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables). */

#define EXC_TABLE_KSTK      0x004   /* Kernel Stack */
#define EXC_TABLE_DOUBLE_SAVE   0x008   /* Double exception save area for a0 */
#define EXC_TABLE_FIXUP     0x00c   /* Fixup handler */
#define EXC_TABLE_PARAM     0x010   /* For passing a parameter to fixup */
#define EXC_TABLE_SYSCALL_SAVE  0x014   /* For fast syscall handler */
#define EXC_TABLE_FAST_USER 0x100   /* Fast user exception handler */
#define EXC_TABLE_FAST_KERNEL   0x200   /* Fast kernel exception handler */
#define EXC_TABLE_DEFAULT   0x300   /* Default C-Handler */
#define EXC_TABLE_SIZE      0x400

/* Registers used by strace */

#define REG_A_BASE  0x0000
#define REG_AR_BASE 0x0100
#define REG_PC      0x0020
#define REG_PS      0x02e6
#define REG_WB      0x0248
#define REG_WS      0x0249
#define REG_LBEG    0x0200
#define REG_LEND    0x0201
#define REG_LCOUNT  0x0202
#define REG_SAR     0x0203

#define SYSCALL_NR  0x00ff

/* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */

#define PTRACE_GETREGS      12
#define PTRACE_SETREGS      13
#define PTRACE_GETXTREGS    18
#define PTRACE_SETXTREGS    19


#endif /* _UAPI_XTENSA_PTRACE_H */