/*
 * Copyright 2010 Tilera Corporation. All Rights Reserved.
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *   NON INFRINGEMENT.  See the GNU General Public License for
 *   more details.
 */

#ifndef _ASM_TILE_PTRACE_H
#define _ASM_TILE_PTRACE_H

#include <arch/chip.h>
#include <arch/abi.h>

/* These must match struct pt_regs, below. */
#if CHIP_WORD_SIZE() == 32
#define PTREGS_OFFSET_REG(n)    ((n)*4)
#else
#define PTREGS_OFFSET_REG(n)    ((n)*8)
#endif
#define PTREGS_OFFSET_BASE      0
#define PTREGS_OFFSET_TP        PTREGS_OFFSET_REG(53)
#define PTREGS_OFFSET_SP        PTREGS_OFFSET_REG(54)
#define PTREGS_OFFSET_LR        PTREGS_OFFSET_REG(55)
#define PTREGS_NR_GPRS          56
#define PTREGS_OFFSET_PC        PTREGS_OFFSET_REG(56)
#define PTREGS_OFFSET_EX1       PTREGS_OFFSET_REG(57)
#define PTREGS_OFFSET_FAULTNUM  PTREGS_OFFSET_REG(58)
#define PTREGS_OFFSET_ORIG_R0   PTREGS_OFFSET_REG(59)
#define PTREGS_OFFSET_FLAGS     PTREGS_OFFSET_REG(60)
#if CHIP_HAS_CMPEXCH()
#define PTREGS_OFFSET_CMPEXCH   PTREGS_OFFSET_REG(61)
#endif
#define PTREGS_SIZE             PTREGS_OFFSET_REG(64)


#ifndef __ASSEMBLY__

/* Provide appropriate length type to userspace regardless of -m32/-m64. */
typedef uint_reg_t pt_reg_t;

/*
 * This struct defines the way the registers are stored on the stack during a
 * system call or exception.  "struct sigcontext" has the same shape.
 */
struct pt_regs {
	/* Saved main processor registers; 56..63 are special. */
	/* tp, sp, and lr must immediately follow regs[] for aliasing. */
	pt_reg_t regs[53];
	pt_reg_t tp;		/* aliases regs[TREG_TP] */
	pt_reg_t sp;		/* aliases regs[TREG_SP] */
	pt_reg_t lr;		/* aliases regs[TREG_LR] */

	/* Saved special registers. */
	pt_reg_t pc;		/* stored in EX_CONTEXT_K_0 */
	pt_reg_t ex1;		/* stored in EX_CONTEXT_K_1 (PL and ICS bit) */
	pt_reg_t faultnum;	/* fault number (INT_SWINT_1 for syscall) */
	pt_reg_t orig_r0;	/* r0 at syscall entry, else zero */
	pt_reg_t flags;		/* flags (see below) */
#if !CHIP_HAS_CMPEXCH()
	pt_reg_t pad[3];
#else
	pt_reg_t cmpexch;	/* value of CMPEXCH_VALUE SPR at interrupt */
	pt_reg_t pad[2];
#endif
};

#endif /* __ASSEMBLY__ */

#define PTRACE_GETREGS		12
#define PTRACE_SETREGS		13
#define PTRACE_GETFPREGS	14
#define PTRACE_SETFPREGS	15

/* Support TILE-specific ptrace options, with events starting at 16. */
#define PTRACE_EVENT_MIGRATE	16
#define PTRACE_O_TRACEMIGRATE	(1 << PTRACE_EVENT_MIGRATE)

/*
 * Flag bits in pt_regs.flags that are part of the ptrace API.
 * We start our numbering higher up to avoid confusion with the
 * non-ABI kernel-internal values that use the low 16 bits.
 */
#define PT_FLAGS_COMPAT		0x10000  /* process is an -m32 compat process */

#endif /* _ASM_TILE_PTRACE_H */
