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/*-

 * Copyright (c) 2005-2009, Kohsuke Ohtani

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the author nor the names of any co-contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#ifndef _ARM_CONTEXT_H

#define _ARM_CONTEXT_H

#ifndef __ASSEMBLY__

#include <sys/types.h>

/**

 * ARM register reference:

 *

 *  Name    Number        ARM Procedure Calling Standard Role

 *

 *  a1            r0                argument 1 / integer result / scratch register / argc

 *  a2            r1                argument 2 / scratch register / argv

 *  a3            r2                argument 3 / scratch register / envp

 *  a4            r3                argument 4 / scratch register

 *  v1            r4                register variable

 *  v2            r5                register variable

 *  v3            r6                register variable

 *  v4            r7                register variable

 *  v5            r8                register variable

 *  sb/v6   r9                static base / register variable

 *  sl/v7   r10                stack limit / stack chunk handle / reg. variable

 *  fp            r11                frame pointer

 *  ip            r12                scratch register / new-sb in inter-link-unit calls

 *  sp            r13                lower end of current stack frame

 *  lr            r14                link address / scratch register

 *  pc            r15                program counter

 */

/*

 * Common register frame for trap/interrupt.

 * These cpu state are saved into top of the kernel stack in

 * trap/interrupt entries. Since the arguments of system calls are

 * passed via registers, the system call library is completely

 * dependent on this register format.

 */

struct cpu_regs {

        uint32_t        r0;        /*  +0 (00) */

        uint32_t        r1;        /*  +4 (04) */

        uint32_t        r2;        /*  +8 (08) */

        uint32_t        r3;        /* +12 (0C) */

        uint32_t        r4;        /* +16 (10) */

        uint32_t        r5;        /* +20 (14) */

        uint32_t        r6;        /* +24 (18) */

        uint32_t        r7;        /* +28 (1C) */

        uint32_t        r8;        /* +32 (20) */

        uint32_t        r9;        /* +36 (24) */

        uint32_t        r10;        /* +40 (28) */

        uint32_t        r11;         /* +44 (2C) */

        uint32_t        r12;        /* +48 (30) */

        uint32_t        sp;        /* +52 (34) */

        uint32_t        lr;        /* +56 (38) */

        uint32_t        cpsr;        /* +60 (3C) */

        uint32_t        svc_sp;        /* +64 (40) */

        uint32_t        svc_lr;        /* +68 (44) */

        uint32_t        pc;        /* +72 (48) */

};

/*

 * Kernel mode context for context switching.

 */

struct kern_regs {

        uint32_t        r4;

        uint32_t        r5;

        uint32_t        r6;

        uint32_t        r7;

        uint32_t        r8;

        uint32_t        r9;

        uint32_t        r10;

        uint32_t        r11;

        uint32_t        sp;

        uint32_t        lr;

};

/*

 * Processor context

 */

struct context {

        struct kern_regs kregs;                /* kernel mode registers */

        struct cpu_regs        *uregs;                /* user mode registers */

        struct cpu_regs        *saved_regs;        /* savecd user mode registers */

};

typedef struct context *context_t;        /* context id */

#endif /* !__ASSEMBLY__ */

/*

 * Register offset in cpu_regs

 */

#define REG_R0                0x00

#define REG_R1                0x04

#define REG_R2                0x08

#define REG_R3                0x0c

#define REG_R4                0x10

#define REG_R5                0x14

#define REG_R6                0x18

#define REG_R7                0x1c

#define REG_R8                0x20

#define REG_R9                0x24

#define REG_R10                0x28

#define REG_R11                0x2c

#define REG_R12                0x30

#define REG_SP                0x34

#define REG_LR                0x38

#define REG_CPSR        0x3c

#define REG_SVCSP        0x40

#define REG_SVCLR        0x44

#define REG_PC                0x48

#define CTXREGS                (4*19)

#endif /* !_ARM_ARCH_H */