LXR linux/arch/arc/include/asm/ptrace.h

   1/*
   2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 *
   8 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
   9 */
  10#ifndef __ASM_ARC_PTRACE_H
  11#define __ASM_ARC_PTRACE_H
  12
  13#include <uapi/asm/ptrace.h>
  14
  15#ifndef __ASSEMBLY__
  16
  17/* THE pt_regs: Defines how regs are saved during entry into kernel */
  18
  19struct pt_regs {
  20
  21        /* Real registers */
  22        long bta;       /* bta_l1, bta_l2, erbta */
  23
  24        long lp_start, lp_end, lp_count;
  25
  26        long status32;  /* status32_l1, status32_l2, erstatus */
  27        long ret;       /* ilink1, ilink2 or eret */
  28        long blink;
  29        long fp;
  30        long r26;       /* gp */
  31
  32        long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
  33
  34        long sp;        /* user/kernel sp depending on where we came from  */
  35        long orig_r0;
  36
  37        /*
  38         * To distinguish bet excp, syscall, irq
  39         * For traps and exceptions, Exception Cause Register.
  40         *      ECR: <00> <VV> <CC> <PP>
  41         *      Last word used by Linux for extra state mgmt (syscall-restart)
  42         * For interrupts, use artificial ECR values to note current prio-level
  43         */
  44        union {
  45                struct {
  46#ifdef CONFIG_CPU_BIG_ENDIAN
  47                        unsigned long state:8, ecr_vec:8,
  48                                      ecr_cause:8, ecr_param:8;
  49#else
  50                        unsigned long ecr_param:8, ecr_cause:8,
  51                                      ecr_vec:8, state:8;
  52#endif
  53                };
  54                unsigned long event;
  55        };
  56
  57        long user_r25;
  58};
  59
  60/* Callee saved registers - need to be saved only when you are scheduled out */
  61
  62struct callee_regs {
  63        long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
  64};
  65
  66#define instruction_pointer(regs)       ((regs)->ret)
  67#define profile_pc(regs)                instruction_pointer(regs)
  68
  69/* return 1 if user mode or 0 if kernel mode */
  70#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
  71
  72#define user_stack_pointer(regs)\
  73({  unsigned int sp;            \
  74        if (user_mode(regs))    \
  75                sp = (regs)->sp;\
  76        else                    \
  77                sp = -1;        \
  78        sp;                     \
  79})
  80
  81/* return 1 if PC in delay slot */
  82#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
  83
  84#define in_syscall(regs)    ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
  85#define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)
  86
  87#define STATE_SCALL_RESTARTED   0x01
  88
  89#define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
  90#define syscall_restartable(reg) !(reg->state &  STATE_SCALL_RESTARTED)
  91
  92#define current_pt_regs()                                       \
  93({                                                              \
  94        /* open-coded current_thread_info() */                  \
  95        register unsigned long sp asm ("sp");                   \
  96        unsigned long pg_start = (sp & ~(THREAD_SIZE - 1));     \
  97        (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
  98})
  99
 100static inline long regs_return_value(struct pt_regs *regs)
 101{
 102        return regs->r0;
 103}
 104
 105#endif /* !__ASSEMBLY__ */
 106
 107#endif /* __ASM_PTRACE_H */
 108