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 struct 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
  62 struct 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
 100 static 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 */