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 #include <asm/spr_defs.h> 23 24 #ifndef __ASSEMBLY__ 25 /* 26 * This is the layout of the regset returned by the GETREGSET ptrace call 27 */ 28 struct user_regs_struct { 29 /* GPR R0-R31... */ 30 unsigned long gpr[32]; 31 unsigned long pc; 32 unsigned long sr; 33 unsigned long pad1; 34 unsigned long pad2; 35 }; 36 #endif 37 38 #ifdef __KERNEL__ 39 40 /* 41 * Make kernel PTrace/register structures opaque to userspace... userspace can 42 * access thread state via the regset mechanism. This allows us a bit of 43 * flexibility in how we order the registers on the stack, permitting some 44 * optimizations like packing call-clobbered registers together so that 45 * they share a cacheline (not done yet, though... future optimization). 46 */ 47 48 #ifndef __ASSEMBLY__ 49 /* 50 * This struct describes how the registers are laid out on the kernel stack 51 * during a syscall or other kernel entry. 52 * 53 * This structure should always be cacheline aligned on the stack. 54 * FIXME: I don't think that's the case right now. The alignment is 55 * taken care of elsewhere... head.S, process.c, etc. 56 */ 57 58 struct pt_regs { 59 union { 60 struct { 61 /* Named registers */ 62 long sr; /* Stored in place of r0 */ 63 long sp; /* r1 */ 64 }; 65 struct { 66 /* Old style */ 67 long offset[2]; 68 long gprs[30]; 69 }; 70 struct { 71 /* New style */ 72 long gpr[32]; 73 }; 74 }; 75 long pc; 76 long orig_gpr11; /* For restarting system calls */ 77 long syscallno; /* Syscall number (used by strace) */ 78 long dummy; /* Cheap alignment fix */ 79 }; 80 81 /* TODO: Rename this to REDZONE because that's what it is */ 82 #define STACK_FRAME_OVERHEAD 128 /* size of minimum stack frame */ 83 84 #define instruction_pointer(regs) ((regs)->pc) 85 #define user_mode(regs) (((regs)->sr & SPR_SR_SM) == 0) 86 #define user_stack_pointer(regs) ((unsigned long)(regs)->sp) 87 #define profile_pc(regs) instruction_pointer(regs) 88 regs_return_value(struct pt_regs * regs)89static inline long regs_return_value(struct pt_regs *regs) 90 { 91 return regs->gpr[11]; 92 } 93 94 #endif /* __ASSEMBLY__ */ 95 96 /* 97 * Offsets used by 'ptrace' system call interface. 98 */ 99 #define PT_SR 0 100 #define PT_SP 4 101 #define PT_GPR2 8 102 #define PT_GPR3 12 103 #define PT_GPR4 16 104 #define PT_GPR5 20 105 #define PT_GPR6 24 106 #define PT_GPR7 28 107 #define PT_GPR8 32 108 #define PT_GPR9 36 109 #define PT_GPR10 40 110 #define PT_GPR11 44 111 #define PT_GPR12 48 112 #define PT_GPR13 52 113 #define PT_GPR14 56 114 #define PT_GPR15 60 115 #define PT_GPR16 64 116 #define PT_GPR17 68 117 #define PT_GPR18 72 118 #define PT_GPR19 76 119 #define PT_GPR20 80 120 #define PT_GPR21 84 121 #define PT_GPR22 88 122 #define PT_GPR23 92 123 #define PT_GPR24 96 124 #define PT_GPR25 100 125 #define PT_GPR26 104 126 #define PT_GPR27 108 127 #define PT_GPR28 112 128 #define PT_GPR29 116 129 #define PT_GPR30 120 130 #define PT_GPR31 124 131 #define PT_PC 128 132 #define PT_ORIG_GPR11 132 133 #define PT_SYSCALLNO 136 134 135 #endif /* __KERNEL__ */ 136 137 #endif /* __ASM_OPENRISC_PTRACE_H */ 138