1 /* 2 * OpenRISC Linux 3 * 4 * Linux architectural port borrowing liberally from similar works of 5 * others. All original copyrights apply as per the original source 6 * declaration. 7 * 8 * OpenRISC implementation: 9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> 10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> 11 * et al. 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 */ 18 19 #ifndef __ASM_OPENRISC_PTRACE_H 20 #define __ASM_OPENRISC_PTRACE_H 21 22 #ifndef __ASSEMBLY__ 23 /* 24 * This is the layout of the regset returned by the GETREGSET ptrace call 25 */ 26 struct user_regs_struct { 27 /* GPR R0-R31... */ 28 unsigned long gpr[32]; 29 unsigned long pc; 30 unsigned long sr; 31 }; 32 #endif 33 34 #ifdef __KERNEL__ 35 36 #include <asm/spr_defs.h> 37 38 /* 39 * Make kernel PTrace/register structures opaque to userspace... userspace can 40 * access thread state via the regset mechanism. This allows us a bit of 41 * flexibility in how we order the registers on the stack, permitting some 42 * optimizations like packing call-clobbered registers together so that 43 * they share a cacheline (not done yet, though... future optimization). 44 */ 45 46 #ifndef __ASSEMBLY__ 47 /* 48 * This struct describes how the registers are laid out on the kernel stack 49 * during a syscall or other kernel entry. 50 * 51 * This structure should always be cacheline aligned on the stack. 52 * FIXME: I don't think that's the case right now. The alignment is 53 * taken care of elsewhere... head.S, process.c, etc. 54 */ 55 56 struct pt_regs { 57 union { 58 struct { 59 /* Named registers */ 60 long sr; /* Stored in place of r0 */ 61 long sp; /* r1 */ 62 }; 63 struct { 64 /* Old style */ 65 long offset[2]; 66 long gprs[30]; 67 }; 68 struct { 69 /* New style */ 70 long gpr[32]; 71 }; 72 }; 73 long pc; 74 /* For restarting system calls: 75 * Set to syscall number for syscall exceptions, 76 * -1 for all other exceptions. 77 */ 78 long orig_gpr11; /* For restarting system calls */ 79 long dummy; /* Cheap alignment fix */ 80 long dummy2; /* Cheap alignment fix */ 81 }; 82 83 /* TODO: Rename this to REDZONE because that's what it is */ 84 #define STACK_FRAME_OVERHEAD 128 /* size of minimum stack frame */ 85 86 #define instruction_pointer(regs) ((regs)->pc) 87 #define user_mode(regs) (((regs)->sr & SPR_SR_SM) == 0) 88 #define user_stack_pointer(regs) ((unsigned long)(regs)->sp) 89 #define profile_pc(regs) instruction_pointer(regs) 90 91 static inline long regs_return_value(struct pt_regs *regs) 92 { 93 return regs->gpr[11]; 94 } 95 96 #endif /* __ASSEMBLY__ */ 97 98 /* 99 * Offsets used by 'ptrace' system call interface. 100 */ 101 #define PT_SR 0 102 #define PT_SP 4 103 #define PT_GPR2 8 104 #define PT_GPR3 12 105 #define PT_GPR4 16 106 #define PT_GPR5 20 107 #define PT_GPR6 24 108 #define PT_GPR7 28 109 #define PT_GPR8 32 110 #define PT_GPR9 36 111 #define PT_GPR10 40 112 #define PT_GPR11 44 113 #define PT_GPR12 48 114 #define PT_GPR13 52 115 #define PT_GPR14 56 116 #define PT_GPR15 60 117 #define PT_GPR16 64 118 #define PT_GPR17 68 119 #define PT_GPR18 72 120 #define PT_GPR19 76 121 #define PT_GPR20 80 122 #define PT_GPR21 84 123 #define PT_GPR22 88 124 #define PT_GPR23 92 125 #define PT_GPR24 96 126 #define PT_GPR25 100 127 #define PT_GPR26 104 128 #define PT_GPR27 108 129 #define PT_GPR28 112 130 #define PT_GPR29 116 131 #define PT_GPR30 120 132 #define PT_GPR31 124 133 #define PT_PC 128 134 #define PT_ORIG_GPR11 132 135 #define PT_SYSCALLNO 136 136 137 #endif /* __KERNEL__ */ 138 139 #endif /* __ASM_OPENRISC_PTRACE_H */ 140