/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Amit Bhor, Sameer Dhavale: Codito Technologies 2004
*/
#ifndef __ASM_ARC_PTRACE_H
#define __ASM_ARC_PTRACE_H

#include <uapi/asm/ptrace.h>

#ifndef __ASSEMBLY__

/* THE pt_regs: Defines how regs are saved during entry into kernel */

struct pt_regs {

/* Real registers */
long bta; /* bta_l1, bta_l2, erbta */

long lp_start, lp_end, lp_count;

long status32; /* status32_l1, status32_l2, erstatus */
long ret; /* ilink1, ilink2 or eret */
long blink;
long fp;
long r26; /* gp */

long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;

long sp; /* user/kernel sp depending on where we came from */
long orig_r0;

/*
* To distinguish bet excp, syscall, irq
* For traps and exceptions, Exception Cause Register.
* ECR: <00> <VV> <CC> <PP>
* Last word used by Linux for extra state mgmt (syscall-restart)
* For interrupts, use artificial ECR values to note current prio-level
*/
union {
struct {
#ifdef CONFIG_CPU_BIG_ENDIAN
unsigned long state:8, ecr_vec:8,
ecr_cause:8, ecr_param:8;
#else
unsigned long ecr_param:8, ecr_cause:8,
ecr_vec:8, state:8;
#endif
};
unsigned long event;
};

long user_r25;
};

/* Callee saved registers - need to be saved only when you are scheduled out */

struct callee_regs {
long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
};

#define instruction_pointer(regs) ((regs)->ret)
#define profile_pc(regs) instruction_pointer(regs)

/* return 1 if user mode or 0 if kernel mode */
#define user_mode(regs) (regs->status32 & STATUS_U_MASK)

#define user_stack_pointer(regs)\
({ unsigned int sp; \
if (user_mode(regs)) \
sp = (regs)->sp;\
else \
sp = -1; \
sp; \
})

/* return 1 if PC in delay slot */
#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)

#define in_syscall(regs) ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
#define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)

#define STATE_SCALL_RESTARTED 0x01

#define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
#define syscall_restartable(reg) !(reg->state & STATE_SCALL_RESTARTED)

#define current_pt_regs() \
({ \
/* open-coded current_thread_info() */ \
register unsigned long sp asm ("sp"); \
unsigned long pg_start = (sp & ~(THREAD_SIZE - 1)); \
(struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
})

static inline long regs_return_value(struct pt_regs *regs)
{
return regs->r0;
}

#endif /* !__ASSEMBLY__ */

#endif /* __ASM_PTRACE_H */