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          * 1 word gutter after reg-file has been saved
  22          * Technically not needed, Since SP always points to a "full" location
  23          * (vs. "empty"). But pt_regs is shared with tools....
  24          */
  25         long res;
  26
  27         /* Real registers */
  28         long bta;       /* bta_l1, bta_l2, erbta */
  29         long lp_start;
  30         long lp_end;
  31         long lp_count;
  32         long status32;  /* status32_l1, status32_l2, erstatus */
  33         long ret;       /* ilink1, ilink2 or eret */
  34         long blink;
  35         long fp;
  36         long r26;       /* gp */
  37         long r12;
  38         long r11;
  39         long r10;
  40         long r9;
  41         long r8;
  42         long r7;
  43         long r6;
  44         long r5;
  45         long r4;
  46         long r3;
  47         long r2;
  48         long r1;
  49         long r0;
  50         long sp;        /* user/kernel sp depending on where we came from  */
  51         long orig_r0;
  52
  53         /*to distinguish bet excp, syscall, irq */
  54         union {
  55                 struct {
  56 #ifdef CONFIG_CPU_BIG_ENDIAN
  57                 /* so that assembly code is same for LE/BE */
  58                 unsigned long orig_r8:16, event:16;
  59 #else
  60                 unsigned long event:16, orig_r8:16;
  61 #endif
  62                 };
  63                 long orig_r8_word;
  64         };
  65 };
  66
  67 /* Callee saved registers - need to be saved only when you are scheduled out */
  68
  69 struct callee_regs {
  70         long res;       /* Again this is not needed */
  71         long r25;
  72         long r24;
  73         long r23;
  74         long r22;
  75         long r21;
  76         long r20;
  77         long r19;
  78         long r18;
  79         long r17;
  80         long r16;
  81         long r15;
  82         long r14;
  83         long r13;
  84 };
  85
  86 #define instruction_pointer(regs)       ((regs)->ret)
  87 #define profile_pc(regs)                instruction_pointer(regs)
  88
  89 /* return 1 if user mode or 0 if kernel mode */
  90 #define user_mode(regs) (regs->status32 & STATUS_U_MASK)
  91
  92 #define user_stack_pointer(regs)\
  93 ({  unsigned int sp;            \
  94         if (user_mode(regs))    \
  95                 sp = (regs)->sp;\
  96         else                    \
  97                 sp = -1;        \
  98         sp;                     \
  99 })
 100
 101 /* return 1 if PC in delay slot */
 102 #define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)
 103
 104 #define in_syscall(regs)    (regs->event & orig_r8_IS_SCALL)
 105 #define in_brkpt_trap(regs) (regs->event & orig_r8_IS_BRKPT)
 106
 107 #define syscall_wont_restart(regs) (regs->event |= orig_r8_IS_SCALL_RESTARTED)
 108 #define syscall_restartable(regs) !(regs->event &  orig_r8_IS_SCALL_RESTARTED)
 109
 110 #define current_pt_regs()                                       \
 111 ({                                                              \
 112         /* open-coded current_thread_info() */                  \
 113         register unsigned long sp asm ("sp");                   \
 114         unsigned long pg_start = (sp & ~(THREAD_SIZE - 1));     \
 115         (struct pt_regs *)(pg_start + THREAD_SIZE - 4) - 1;     \
 116 })
 117
 118 static inline long regs_return_value(struct pt_regs *regs)
 119 {
 120         return regs->r0;
 121 }
 122
 123 #endif /* !__ASSEMBLY__ */
 124
 125 #define orig_r8_IS_SCALL                0x0001
 126 #define orig_r8_IS_SCALL_RESTARTED      0x0002
 127 #define orig_r8_IS_BRKPT                0x0004
 128 #define orig_r8_IS_EXCPN                0x0008
 129 #define orig_r8_IS_IRQ1                 0x0010
 130 #define orig_r8_IS_IRQ2                 0x0020
 131
 132 #endif /* __ASM_PTRACE_H */