Jonas Bonn | e5ad95c | 2011-06-04 21:54:22 +0300 | [diff] [blame] | 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 | |
Jonas Bonn | e5ad95c | 2011-06-04 21:54:22 +0300 | [diff] [blame] | 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; |
Jonas Bonn | e5ad95c | 2011-06-04 21:54:22 +0300 | [diff] [blame] | 31 | }; |
| 32 | #endif |
| 33 | |
| 34 | #ifdef __KERNEL__ |
| 35 | |
Jonas Bonn | b0e026f | 2012-04-10 10:49:13 +0200 | [diff] [blame^] | 36 | #include <asm/spr_defs.h> |
| 37 | |
Jonas Bonn | e5ad95c | 2011-06-04 21:54:22 +0300 | [diff] [blame] | 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; |
Jonas Bonn | 6cbe5e9 | 2012-03-02 10:05:24 +0100 | [diff] [blame] | 74 | /* For restarting system calls: |
| 75 | * Set to syscall number for syscall exceptions, |
| 76 | * -1 for all other exceptions. |
| 77 | */ |
Jonas Bonn | e5ad95c | 2011-06-04 21:54:22 +0300 | [diff] [blame] | 78 | long orig_gpr11; /* For restarting system calls */ |
Jonas Bonn | e5ad95c | 2011-06-04 21:54:22 +0300 | [diff] [blame] | 79 | long dummy; /* Cheap alignment fix */ |
Jonas Bonn | 6cbe5e9 | 2012-03-02 10:05:24 +0100 | [diff] [blame] | 80 | long dummy2; /* Cheap alignment fix */ |
Jonas Bonn | e5ad95c | 2011-06-04 21:54:22 +0300 | [diff] [blame] | 81 | }; |
Jonas Bonn | e5ad95c | 2011-06-04 21:54:22 +0300 | [diff] [blame] | 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 | |
Jonas Bonn | 3f6ffc8 | 2012-02-15 15:02:20 +0100 | [diff] [blame] | 91 | static inline long regs_return_value(struct pt_regs *regs) |
| 92 | { |
| 93 | return regs->gpr[11]; |
| 94 | } |
| 95 | |
| 96 | #endif /* __ASSEMBLY__ */ |
| 97 | |
Jonas Bonn | e5ad95c | 2011-06-04 21:54:22 +0300 | [diff] [blame] | 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 */ |