ptrace.h revision 7540dadaf9a8b0f67d41f8bc216ca4d67d9128b0
1/* 2 * Based on arch/arm/include/asm/ptrace.h 3 * 4 * Copyright (C) 1996-2003 Russell King 5 * Copyright (C) 2012 ARM Ltd. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19#ifndef __ASM_PTRACE_H 20#define __ASM_PTRACE_H 21 22#include <uapi/asm/ptrace.h> 23 24/* Current Exception Level values, as contained in CurrentEL */ 25#define CurrentEL_EL1 (1 << 2) 26#define CurrentEL_EL2 (2 << 2) 27 28/* AArch32-specific ptrace requests */ 29#define COMPAT_PTRACE_GETREGS 12 30#define COMPAT_PTRACE_SETREGS 13 31#define COMPAT_PTRACE_GET_THREAD_AREA 22 32#define COMPAT_PTRACE_SET_SYSCALL 23 33#define COMPAT_PTRACE_GETVFPREGS 27 34#define COMPAT_PTRACE_SETVFPREGS 28 35#define COMPAT_PTRACE_GETHBPREGS 29 36#define COMPAT_PTRACE_SETHBPREGS 30 37 38/* AArch32 CPSR bits */ 39#define COMPAT_PSR_MODE_MASK 0x0000001f 40#define COMPAT_PSR_MODE_USR 0x00000010 41#define COMPAT_PSR_MODE_FIQ 0x00000011 42#define COMPAT_PSR_MODE_IRQ 0x00000012 43#define COMPAT_PSR_MODE_SVC 0x00000013 44#define COMPAT_PSR_MODE_ABT 0x00000017 45#define COMPAT_PSR_MODE_HYP 0x0000001a 46#define COMPAT_PSR_MODE_UND 0x0000001b 47#define COMPAT_PSR_MODE_SYS 0x0000001f 48#define COMPAT_PSR_T_BIT 0x00000020 49#define COMPAT_PSR_E_BIT 0x00000200 50#define COMPAT_PSR_F_BIT 0x00000040 51#define COMPAT_PSR_I_BIT 0x00000080 52#define COMPAT_PSR_A_BIT 0x00000100 53#define COMPAT_PSR_E_BIT 0x00000200 54#define COMPAT_PSR_J_BIT 0x01000000 55#define COMPAT_PSR_Q_BIT 0x08000000 56#define COMPAT_PSR_V_BIT 0x10000000 57#define COMPAT_PSR_C_BIT 0x20000000 58#define COMPAT_PSR_Z_BIT 0x40000000 59#define COMPAT_PSR_N_BIT 0x80000000 60#define COMPAT_PSR_IT_MASK 0x0600fc00 /* If-Then execution state mask */ 61 62#ifdef CONFIG_CPU_BIG_ENDIAN 63#define COMPAT_PSR_ENDSTATE COMPAT_PSR_E_BIT 64#else 65#define COMPAT_PSR_ENDSTATE 0 66#endif 67 68/* 69 * These are 'magic' values for PTRACE_PEEKUSR that return info about where a 70 * process is located in memory. 71 */ 72#define COMPAT_PT_TEXT_ADDR 0x10000 73#define COMPAT_PT_DATA_ADDR 0x10004 74#define COMPAT_PT_TEXT_END_ADDR 0x10008 75 76/* 77 * used to skip a system call when tracer changes its number to -1 78 * with ptrace(PTRACE_SET_SYSCALL) 79 */ 80#define RET_SKIP_SYSCALL -1 81#define RET_SKIP_SYSCALL_TRACE -2 82#define IS_SKIP_SYSCALL(no) ((int)(no & 0xffffffff) == -1) 83 84#ifndef __ASSEMBLY__ 85 86/* sizeof(struct user) for AArch32 */ 87#define COMPAT_USER_SZ 296 88 89/* Architecturally defined mapping between AArch32 and AArch64 registers */ 90#define compat_usr(x) regs[(x)] 91#define compat_fp regs[11] 92#define compat_sp regs[13] 93#define compat_lr regs[14] 94#define compat_sp_hyp regs[15] 95#define compat_sp_irq regs[16] 96#define compat_lr_irq regs[17] 97#define compat_sp_svc regs[18] 98#define compat_lr_svc regs[19] 99#define compat_sp_abt regs[20] 100#define compat_lr_abt regs[21] 101#define compat_sp_und regs[22] 102#define compat_lr_und regs[23] 103#define compat_r8_fiq regs[24] 104#define compat_r9_fiq regs[25] 105#define compat_r10_fiq regs[26] 106#define compat_r11_fiq regs[27] 107#define compat_r12_fiq regs[28] 108#define compat_sp_fiq regs[29] 109#define compat_lr_fiq regs[30] 110 111/* 112 * This struct defines the way the registers are stored on the stack during an 113 * exception. Note that sizeof(struct pt_regs) has to be a multiple of 16 (for 114 * stack alignment). struct user_pt_regs must form a prefix of struct pt_regs. 115 */ 116struct pt_regs { 117 union { 118 struct user_pt_regs user_regs; 119 struct { 120 u64 regs[31]; 121 u64 sp; 122 u64 pc; 123 u64 pstate; 124 }; 125 }; 126 u64 orig_x0; 127 u64 syscallno; 128}; 129 130#define arch_has_single_step() (1) 131 132#ifdef CONFIG_COMPAT 133#define compat_thumb_mode(regs) \ 134 (((regs)->pstate & COMPAT_PSR_T_BIT)) 135#else 136#define compat_thumb_mode(regs) (0) 137#endif 138 139#define user_mode(regs) \ 140 (((regs)->pstate & PSR_MODE_MASK) == PSR_MODE_EL0t) 141 142#define compat_user_mode(regs) \ 143 (((regs)->pstate & (PSR_MODE32_BIT | PSR_MODE_MASK)) == \ 144 (PSR_MODE32_BIT | PSR_MODE_EL0t)) 145 146#define processor_mode(regs) \ 147 ((regs)->pstate & PSR_MODE_MASK) 148 149#define interrupts_enabled(regs) \ 150 (!((regs)->pstate & PSR_I_BIT)) 151 152#define fast_interrupts_enabled(regs) \ 153 (!((regs)->pstate & PSR_F_BIT)) 154 155#define user_stack_pointer(regs) \ 156 (!compat_user_mode(regs) ? (regs)->sp : (regs)->compat_sp) 157 158static inline unsigned long regs_return_value(struct pt_regs *regs) 159{ 160 return regs->regs[0]; 161} 162 163/* 164 * Are the current registers suitable for user mode? (used to maintain 165 * security in signal handlers) 166 */ 167static inline int valid_user_regs(struct user_pt_regs *regs) 168{ 169 if (user_mode(regs) && (regs->pstate & PSR_I_BIT) == 0) { 170 regs->pstate &= ~(PSR_F_BIT | PSR_A_BIT); 171 172 /* The T bit is reserved for AArch64 */ 173 if (!(regs->pstate & PSR_MODE32_BIT)) 174 regs->pstate &= ~COMPAT_PSR_T_BIT; 175 176 return 1; 177 } 178 179 /* 180 * Force PSR to something logical... 181 */ 182 regs->pstate &= PSR_f | PSR_s | (PSR_x & ~PSR_A_BIT) | \ 183 COMPAT_PSR_T_BIT | PSR_MODE32_BIT; 184 185 if (!(regs->pstate & PSR_MODE32_BIT)) { 186 regs->pstate &= ~COMPAT_PSR_T_BIT; 187 regs->pstate |= PSR_MODE_EL0t; 188 } 189 190 return 0; 191} 192 193#define instruction_pointer(regs) ((unsigned long)(regs)->pc) 194 195#ifdef CONFIG_SMP 196extern unsigned long profile_pc(struct pt_regs *regs); 197#else 198#define profile_pc(regs) instruction_pointer(regs) 199#endif 200 201#endif /* __ASSEMBLY__ */ 202#endif 203