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/powerpc/kernel/ptrace.c. 18 */ 19 20 #ifndef __ASSEMBLY__ 21 #ifdef CONFIG_PPC64BRIDGE 22 #define PPC_REG unsigned long /*long*/ 23 #else 24 #define PPC_REG unsigned long 25 #endif 26 struct pt_regs { 27 PPC_REG gpr[32]; 28 PPC_REG nip; 29 PPC_REG msr; 30 PPC_REG orig_gpr3; /* Used for restarting system calls */ 31 PPC_REG ctr; 32 PPC_REG link; 33 PPC_REG xer; 34 PPC_REG ccr; 35 PPC_REG mq; /* 601 only (not used at present) */ 36 /* Used on APUS to hold IPL value. */ 37 PPC_REG trap; /* Reason for being here */ 38 PPC_REG dar; /* Fault registers */ 39 PPC_REG dsisr; 40 PPC_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 & MSR_PR) != 0) 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