include/asm-ppc/ptrace.h

   1 #ifndef _PPC_PTRACE_H
   2 #define _PPC_PTRACE_H
   3
   4 /*
   5  * This struct defines the way the registers are stored on the
   6  * kernel stack during a system call or other kernel entry.
   7  *
   8  * this should only contain volatile regs
   9  * since we can keep non-volatile in the tss
  10  * should set this up when only volatiles are saved
  11  * by intr code.
  12  *
  13  * Since this is going on the stack, *CARE MUST BE TAKEN* to insure
  14  * that the overall structure is a multiple of 16 bytes in length.
  15  *
  16  * Note that the offsets of the fields in this struct correspond with
  17  * the PT_* values below.  This simplifies arch/ppc/kernel/ptrace.c.
  18  */
  19
  20 #ifndef __ASSEMBLY__
  21 #ifdef CONFIG_PPC64
  22 #define REG unsigned long /*long*/
  23 #else
  24 #define REG unsigned long
  25 #endif
  26 struct pt_regs {
  27         REG gpr[32];
  28         REG nip;
  29         REG msr;
  30         REG orig_gpr3;  /* Used for restarting system calls */
  31         REG ctr;
  32         REG link;
  33         REG xer;
  34         REG ccr;
  35         REG mq;         /* 601 only (not used at present) */
  36                         /* Used on APUS to hold IPL value. */
  37         REG trap;       /* Reason for being here */
  38         REG dar;        /* Fault registers */
  39         REG dsisr;
  40         REG result;     /* Result of a system call */
  41 };
  42 #endif
  43
  44 #define STACK_FRAME_OVERHEAD    16      /* size of minimum stack frame */
  45
  46 /* Size of stack frame allocated when calling signal handler. */
  47 #define __SIGNAL_FRAMESIZE      64
  48
  49 #define instruction_pointer(regs) ((regs)->nip)
  50 #define user_mode(regs) ((regs)->msr & 0x4000)
  51
  52 /*
  53  * Offsets used by 'ptrace' system call interface.
  54  * These can't be changed without breaking binary compatibility
  55  * with MkLinux, etc.
  56  */
  57 #define PT_R0   0
  58 #define PT_R1   1
  59 #define PT_R2   2
  60 #define PT_R3   3
  61 #define PT_R4   4
  62 #define PT_R5   5
  63 #define PT_R6   6
  64 #define PT_R7   7
  65 #define PT_R8   8
  66 #define PT_R9   9
  67 #define PT_R10  10
  68 #define PT_R11  11
  69 #define PT_R12  12
  70 #define PT_R13  13
  71 #define PT_R14  14
  72 #define PT_R15  15
  73 #define PT_R16  16
  74 #define PT_R17  17
  75 #define PT_R18  18
  76 #define PT_R19  19
  77 #define PT_R20  20
  78 #define PT_R21  21
  79 #define PT_R22  22
  80 #define PT_R23  23
  81 #define PT_R24  24
  82 #define PT_R25  25
  83 #define PT_R26  26
  84 #define PT_R27  27
  85 #define PT_R28  28
  86 #define PT_R29  29
  87 #define PT_R30  30
  88 #define PT_R31  31
  89
  90 #define PT_NIP  32
  91 #define PT_MSR  33
  92 #ifdef __KERNEL__
  93 #define PT_ORIG_R3 34
  94 #endif
  95 #define PT_CTR  35
  96 #define PT_LNK  36
  97 #define PT_XER  37
  98 #define PT_CCR  38
  99 #define PT_MQ   39
 100
 101 #define PT_FPR0 48      /* each FP reg occupies 2 slots in this space */
 102 #define PT_FPR31 (PT_FPR0 + 2*31)
 103 #define PT_FPSCR (PT_FPR0 + 2*32 + 1)
 104
 105 #endif
 106