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 #ifndef __ASM_OPENRISC_PTRACE_H 19 #define __ASM_OPENRISC_PTRACE_H 20 21 22 #include <asm/spr_defs.h> 23 #include <uapi/asm/ptrace.h> 24 25 /* 26 * Make kernel PTrace/register structures opaque to userspace... userspace can 27 * access thread state via the regset mechanism. This allows us a bit of 28 * flexibility in how we order the registers on the stack, permitting some 29 * optimizations like packing call-clobbered registers together so that 30 * they share a cacheline (not done yet, though... future optimization). 31 */ 32 33 #ifndef __ASSEMBLY__ 34 /* 35 * This struct describes how the registers are laid out on the kernel stack 36 * during a syscall or other kernel entry. 37 * 38 * This structure should always be cacheline aligned on the stack. 39 * FIXME: I don't think that's the case right now. The alignment is 40 * taken care of elsewhere... head.S, process.c, etc. 41 */ 42 43 struct pt_regs { 44 union { 45 struct { 46 /* Named registers */ 47 long sr; /* Stored in place of r0 */ 48 long sp; /* r1 */ 49 }; 50 struct { 51 /* Old style */ 52 long offset[2]; 53 long gprs[30]; 54 }; 55 struct { 56 /* New style */ 57 long gpr[32]; 58 }; 59 }; 60 long pc; 61 /* For restarting system calls: 62 * Set to syscall number for syscall exceptions, 63 * -1 for all other exceptions. 64 */ 65 long orig_gpr11; /* For restarting system calls */ 66 long dummy; /* Cheap alignment fix */ 67 long dummy2; /* Cheap alignment fix */ 68 }; 69 70 /* TODO: Rename this to REDZONE because that's what it is */ 71 #define STACK_FRAME_OVERHEAD 128 /* size of minimum stack frame */ 72 73 #define instruction_pointer(regs) ((regs)->pc) 74 #define user_mode(regs) (((regs)->sr & SPR_SR_SM) == 0) 75 #define user_stack_pointer(regs) ((unsigned long)(regs)->sp) 76 #define profile_pc(regs) instruction_pointer(regs) 77 78 static inline long regs_return_value(struct pt_regs *regs) 79 { 80 return regs->gpr[11]; 81 } 82 83 #endif /* __ASSEMBLY__ */ 84 85 /* 86 * Offsets used by 'ptrace' system call interface. 87 */ 88 #define PT_SR 0 89 #define PT_SP 4 90 #define PT_GPR2 8 91 #define PT_GPR3 12 92 #define PT_GPR4 16 93 #define PT_GPR5 20 94 #define PT_GPR6 24 95 #define PT_GPR7 28 96 #define PT_GPR8 32 97 #define PT_GPR9 36 98 #define PT_GPR10 40 99 #define PT_GPR11 44 100 #define PT_GPR12 48 101 #define PT_GPR13 52 102 #define PT_GPR14 56 103 #define PT_GPR15 60 104 #define PT_GPR16 64 105 #define PT_GPR17 68 106 #define PT_GPR18 72 107 #define PT_GPR19 76 108 #define PT_GPR20 80 109 #define PT_GPR21 84 110 #define PT_GPR22 88 111 #define PT_GPR23 92 112 #define PT_GPR24 96 113 #define PT_GPR25 100 114 #define PT_GPR26 104 115 #define PT_GPR27 108 116 #define PT_GPR28 112 117 #define PT_GPR29 116 118 #define PT_GPR30 120 119 #define PT_GPR31 124 120 #define PT_PC 128 121 #define PT_ORIG_GPR11 132 122 #define PT_SYSCALLNO 136 123 124 #endif /* __ASM_OPENRISC_PTRACE_H */ 125