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
  19#ifdef CONFIG_ISA_ARCOMPACT
  20struct pt_regs {
  21
  22#ifdef CONFIG_ARC_PLAT_EZNPS
  23        unsigned long eflags;   /* Extended FLAGS */
  24        unsigned long gpa1;     /* General Purpose Aux */
  25#endif
  26
  27        /* Real registers */
  28        unsigned long bta;      /* bta_l1, bta_l2, erbta */
  29
  30        unsigned long lp_start, lp_end, lp_count;
  31
  32        unsigned long status32; /* status32_l1, status32_l2, erstatus */
  33        unsigned long ret;      /* ilink1, ilink2 or eret */
  34        unsigned long blink;
  35        unsigned long fp;
  36        unsigned long r26;      /* gp */
  37
  38        unsigned long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;
  39
  40        unsigned long sp;       /* User/Kernel depending on where we came from */
  41        unsigned long orig_r0;
  42
  43        /*
  44         * To distinguish bet excp, syscall, irq
  45         * For traps and exceptions, Exception Cause Register.
  46         *      ECR: <00> <VV> <CC> <PP>
  47         *      Last word used by Linux for extra state mgmt (syscall-restart)
  48         * For interrupts, use artificial ECR values to note current prio-level
  49         */
  50        union {
  51                struct {
  52#ifdef CONFIG_CPU_BIG_ENDIAN
  53                        unsigned long state:8, ecr_vec:8,
  54                                      ecr_cause:8, ecr_param:8;
  55#else
  56                        unsigned long ecr_param:8, ecr_cause:8,
  57                                      ecr_vec:8, state:8;
  58#endif
  59                };
  60                unsigned long event;
  61        };
  62
  63        unsigned long user_r25;
  64};
  65#else
  66
  67struct pt_regs {
  68
  69        unsigned long orig_r0;
  70
  71        union {
  72                struct {
  73#ifdef CONFIG_CPU_BIG_ENDIAN
  74                        unsigned long state:8, ecr_vec:8,
  75                                      ecr_cause:8, ecr_param:8;
  76#else
  77                        unsigned long ecr_param:8, ecr_cause:8,
  78                                      ecr_vec:8, state:8;
  79#endif
  80                };
  81                unsigned long event;
  82        };
  83
  84        unsigned long bta;      /* bta_l1, bta_l2, erbta */
  85
  86        unsigned long user_r25;
  87
  88        unsigned long r26;      /* gp */
  89        unsigned long fp;
  90        unsigned long sp;       /* user/kernel sp depending on where we came from  */
  91
  92        unsigned long r12, r30;
  93
  94#ifdef CONFIG_ARC_HAS_ACCL_REGS
  95        unsigned long r58, r59; /* ACCL/ACCH used by FPU / DSP MPY */
  96#endif
  97
  98        /*------- Below list auto saved by h/w -----------*/
  99        unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;
 100
 101        unsigned long blink;
 102        unsigned long lp_end, lp_start, lp_count;
 103
 104        unsigned long ei, ldi, jli;
 105
 106        unsigned long ret;
 107        unsigned long status32;
 108};
 109
 110#endif
 111
 112/* Callee saved registers - need to be saved only when you are scheduled out */
 113
 114struct callee_regs {
 115        unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;
 116};
 117
 118#define instruction_pointer(regs)       ((regs)->ret)
 119#define profile_pc(regs)                instruction_pointer(regs)
 120
 121/* return 1 if user mode or 0 if kernel mode */
 122#define user_mode(regs) (regs->status32 & STATUS_U_MASK)
 123
 124#define user_stack_pointer(regs)\
 125({  unsigned int sp;            \
 126        if (user_mode(regs))    \
 127                sp = (regs)->sp;\
 128        else                    \
 129                sp = -1;        \
 130        sp;                     \
 131})
 132
 133/* return 1 if PC in delay slot */
 134#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
 135
 136#define in_syscall(regs)    ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
 137#define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)
 138
 139#define STATE_SCALL_RESTARTED   0x01
 140
 141#define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
 142#define syscall_restartable(reg) !(reg->state &  STATE_SCALL_RESTARTED)
 143
 144#define current_pt_regs()                                       \
 145({                                                              \
 146        /* open-coded current_thread_info() */                  \
 147        register unsigned long sp asm ("sp");                   \
 148        unsigned long pg_start = (sp & ~(THREAD_SIZE - 1));     \
 149        (struct pt_regs *)(pg_start + THREAD_SIZE) - 1; \
 150})
 151
 152static inline long regs_return_value(struct pt_regs *regs)
 153{
 154        return (long)regs->r0;
 155}
 156
 157#endif /* !__ASSEMBLY__ */
 158
 159#endif /* __ASM_PTRACE_H */
 160