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