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 thread_struct
  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 struct pt_regs {
  22         unsigned long gpr[32];
  23         unsigned long nip;
  24         unsigned long msr;
  25         unsigned long orig_gpr3;        /* Used for restarting system calls */
  26         unsigned long ctr;
  27         unsigned long link;
  28         unsigned long xer;
  29         unsigned long ccr;
  30         unsigned long mq;               /* 601 only (not used at present) */
  31                                         /* Used on APUS to hold IPL value. */
  32         unsigned long trap;             /* Reason for being here */
  33         /* N.B. for critical exceptions on 4xx, the dar and dsisr
  34            fields are overloaded to hold srr0 and srr1. */
  35         unsigned long dar;              /* Fault registers */
  36         unsigned long dsisr;            /* on 4xx/Book-E used for ESR */
  37         unsigned long result;           /* Result of a system call */
  38 };
  39
  40 #endif /* __ASSEMBLY__ */
  41
  42 #ifdef __KERNEL__
  43 #define STACK_FRAME_OVERHEAD    16      /* size of minimum stack frame */
  44
  45 /* Size of stack frame allocated when calling signal handler. */
  46 #define __SIGNAL_FRAMESIZE      64
  47
  48 #ifndef __ASSEMBLY__
  49 #define instruction_pointer(regs) ((regs)->nip)
  50 #ifdef CONFIG_SMP
  51 extern unsigned long profile_pc(struct pt_regs *regs);
  52 #else
  53 #define profile_pc(regs) instruction_pointer(regs)
  54 #endif
  55
  56 #define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
  57
  58 #define force_successful_syscall_return()   \
  59         do { \
  60                 current_thread_info()->local_flags |= _TIFL_FORCE_NOERROR; \
  61         } while(0)
  62
  63 /*
  64  * We use the least-significant bit of the trap field to indicate
  65  * whether we have saved the full set of registers, or only a
  66  * partial set.  A 1 there means the partial set.
  67  * On 4xx we use the next bit to indicate whether the exception
  68  * is a critical exception (1 means it is).
  69  */
  70 #define FULL_REGS(regs)         (((regs)->trap & 1) == 0)
  71 #define IS_CRITICAL_EXC(regs)   (((regs)->trap & 2) == 0)
  72 #define TRAP(regs)              ((regs)->trap & ~0xF)
  73
  74 #define CHECK_FULL_REGS(regs)                                                 \
  75 do {                                                                          \
  76         if ((regs)->trap & 1)                                                 \
  77                 printk(KERN_CRIT "%s: partial register set\n", __FUNCTION__); \
  78 } while (0)
  79 #endif /* __ASSEMBLY__ */
  80
  81 #endif /* __KERNEL__ */
  82
  83 /*
  84  * Offsets used by 'ptrace' system call interface.
  85  * These can't be changed without breaking binary compatibility
  86  * with MkLinux, etc.
  87  */
  88 #define PT_R0   0
  89 #define PT_R1   1
  90 #define PT_R2   2
  91 #define PT_R3   3
  92 #define PT_R4   4
  93 #define PT_R5   5
  94 #define PT_R6   6
  95 #define PT_R7   7
  96 #define PT_R8   8
  97 #define PT_R9   9
  98 #define PT_R10  10
  99 #define PT_R11  11
 100 #define PT_R12  12
 101 #define PT_R13  13
 102 #define PT_R14  14
 103 #define PT_R15  15
 104 #define PT_R16  16
 105 #define PT_R17  17
 106 #define PT_R18  18
 107 #define PT_R19  19
 108 #define PT_R20  20
 109 #define PT_R21  21
 110 #define PT_R22  22
 111 #define PT_R23  23
 112 #define PT_R24  24
 113 #define PT_R25  25
 114 #define PT_R26  26
 115 #define PT_R27  27
 116 #define PT_R28  28
 117 #define PT_R29  29
 118 #define PT_R30  30
 119 #define PT_R31  31
 120
 121 #define PT_NIP  32
 122 #define PT_MSR  33
 123 #ifdef __KERNEL__
 124 #define PT_ORIG_R3 34
 125 #endif
 126 #define PT_CTR  35
 127 #define PT_LNK  36
 128 #define PT_XER  37
 129 #define PT_CCR  38
 130 #define PT_MQ   39
 131
 132 #define PT_FPR0 48      /* each FP reg occupies 2 slots in this space */
 133 #define PT_FPR31 (PT_FPR0 + 2*31)
 134 #define PT_FPSCR (PT_FPR0 + 2*32 + 1)
 135
 136 /* Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go */
 137 #define PTRACE_GETVRREGS        18
 138 #define PTRACE_SETVRREGS        19
 139
 140 /* Get/set all the upper 32-bits of the SPE registers, accumulator, and
 141  * spefscr, in one go */
 142 #define PTRACE_GETEVRREGS       20
 143 #define PTRACE_SETEVRREGS       21
 144
 145 #endif