processor.h

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/*
 * linux/arch/unicore32/include/asm/processor.h
 *
 * Code specific to PKUnity SoC and UniCore ISA
 *
 * Copyright (C) 2001-2010 GUAN Xue-tao
 *
 * 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.
 */

#ifndef __UNICORE_PROCESSOR_H__
#define __UNICORE_PROCESSOR_H__

/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter").
 */
#define current_text_addr() ({ __label__ _l; _l: &&_l; })

#ifdef __KERNEL__

#include <asm/ptrace.h>
#include <asm/types.h>

#ifdef __KERNEL__
#define STACK_TOP   TASK_SIZE
#define STACK_TOP_MAX   TASK_SIZE
#endif

struct debug_entry {
    u32         address;
    u32         insn;
};

struct debug_info {
    int         nsaved;
    struct debug_entry  bp[2];
};

struct thread_struct {
                            /* fault info     */
    unsigned long       address;
    unsigned long       trap_no;
    unsigned long       error_code;
                            /* debugging      */
    struct debug_info   debug;
};

#define INIT_THREAD  {  }

#define start_thread(regs, pc, sp)                  \
({                                  \
    unsigned long *stack = (unsigned long *)sp;         \
    memset(regs->uregs, 0, sizeof(regs->uregs));            \
    regs->UCreg_asr = USER_MODE;                    \
    regs->UCreg_pc = pc & ~1;   /* pc */                        \
    regs->UCreg_sp = sp;        /* sp */                        \
    regs->UCreg_02 = stack[2];  /* r2 (envp) */                 \
    regs->UCreg_01 = stack[1];  /* r1 (argv) */                 \
    regs->UCreg_00 = stack[0];  /* r0 (argc) */                 \
})

/* Forward declaration, a strange C thing */
struct task_struct;

/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);

unsigned long get_wchan(struct task_struct *p);

#define cpu_relax()         barrier()

#define task_pt_regs(p) \
    ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)

#define KSTK_EIP(tsk)   (task_pt_regs(tsk)->UCreg_pc)
#define KSTK_ESP(tsk)   (task_pt_regs(tsk)->UCreg_sp)

#endif

#endif /* __UNICORE_PROCESSOR_H__ */