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
  20 struct 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
  67 struct 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
 114 struct 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
 152 static 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 */