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_F_BIT 0x00000040 50 #define COMPAT_PSR_I_BIT 0x00000080 51 #define COMPAT_PSR_A_BIT 0x00000100 52 #define COMPAT_PSR_E_BIT 0x00000200 53 #define COMPAT_PSR_J_BIT 0x01000000 54 #define COMPAT_PSR_Q_BIT 0x08000000 55 #define COMPAT_PSR_V_BIT 0x10000000 56 #define COMPAT_PSR_C_BIT 0x20000000 57 #define COMPAT_PSR_Z_BIT 0x40000000 58 #define COMPAT_PSR_N_BIT 0x80000000 59 #define COMPAT_PSR_IT_MASK 0x0600fc00 /* If-Then execution state mask */ 60 #define COMPAT_PSR_GE_MASK 0x000f0000 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 * If pt_regs.syscallno == NO_SYSCALL, then the thread is not executing 78 * a syscall -- i.e., its most recent entry into the kernel from 79 * userspace was not via SVC, or otherwise a tracer cancelled the syscall. 80 * 81 * This must have the value -1, for ABI compatibility with ptrace etc. 82 */ 83 #define NO_SYSCALL (-1) 84 85 #ifndef __ASSEMBLY__ 86 #include <linux/bug.h> 87 #include <linux/types.h> 88 89 /* sizeof(struct user) for AArch32 */ 90 #define COMPAT_USER_SZ 296 91 92 /* Architecturally defined mapping between AArch32 and AArch64 registers */ 93 #define compat_usr(x) regs[(x)] 94 #define compat_fp regs[11] 95 #define compat_sp regs[13] 96 #define compat_lr regs[14] 97 #define compat_sp_hyp regs[15] 98 #define compat_lr_irq regs[16] 99 #define compat_sp_irq regs[17] 100 #define compat_lr_svc regs[18] 101 #define compat_sp_svc regs[19] 102 #define compat_lr_abt regs[20] 103 #define compat_sp_abt regs[21] 104 #define compat_lr_und regs[22] 105 #define compat_sp_und regs[23] 106 #define compat_r8_fiq regs[24] 107 #define compat_r9_fiq regs[25] 108 #define compat_r10_fiq regs[26] 109 #define compat_r11_fiq regs[27] 110 #define compat_r12_fiq regs[28] 111 #define compat_sp_fiq regs[29] 112 #define compat_lr_fiq regs[30] 113 114 /* 115 * This struct defines the way the registers are stored on the stack during an 116 * exception. Note that sizeof(struct pt_regs) has to be a multiple of 16 (for 117 * stack alignment). struct user_pt_regs must form a prefix of struct pt_regs. 118 */ 119 struct pt_regs { 120 union { 121 struct user_pt_regs user_regs; 122 struct { 123 u64 regs[31]; 124 u64 sp; 125 u64 pc; 126 u64 pstate; 127 }; 128 }; 129 u64 orig_x0; 130 #ifdef __AARCH64EB__ 131 u32 unused2; 132 s32 syscallno; 133 #else 134 s32 syscallno; 135 u32 unused2; 136 #endif 137 138 u64 orig_addr_limit; 139 u64 unused; // maintain 16 byte alignment 140 u64 stackframe[2]; 141 }; 142 143 static inline bool in_syscall(struct pt_regs const *regs) 144 { 145 return regs->syscallno != NO_SYSCALL; 146 } 147 148 static inline void forget_syscall(struct pt_regs *regs) 149 { 150 regs->syscallno = NO_SYSCALL; 151 } 152 153 #define MAX_REG_OFFSET offsetof(struct pt_regs, pstate) 154 155 #define arch_has_single_step() (1) 156 157 #ifdef CONFIG_COMPAT 158 #define compat_thumb_mode(regs) \ 159 (((regs)->pstate & COMPAT_PSR_T_BIT)) 160 #else 161 #define compat_thumb_mode(regs) (0) 162 #endif 163 164 #define user_mode(regs) \ 165 (((regs)->pstate & PSR_MODE_MASK) == PSR_MODE_EL0t) 166 167 #define compat_user_mode(regs) \ 168 (((regs)->pstate & (PSR_MODE32_BIT | PSR_MODE_MASK)) == \ 169 (PSR_MODE32_BIT | PSR_MODE_EL0t)) 170 171 #define processor_mode(regs) \ 172 ((regs)->pstate & PSR_MODE_MASK) 173 174 #define interrupts_enabled(regs) \ 175 (!((regs)->pstate & PSR_I_BIT)) 176 177 #define fast_interrupts_enabled(regs) \ 178 (!((regs)->pstate & PSR_F_BIT)) 179 180 #define GET_USP(regs) \ 181 (!compat_user_mode(regs) ? (regs)->sp : (regs)->compat_sp) 182 183 #define SET_USP(ptregs, value) \ 184 (!compat_user_mode(regs) ? ((regs)->sp = value) : ((regs)->compat_sp = value)) 185 186 extern int regs_query_register_offset(const char *name); 187 extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, 188 unsigned int n); 189 190 /** 191 * regs_get_register() - get register value from its offset 192 * @regs: pt_regs from which register value is gotten 193 * @offset: offset of the register. 194 * 195 * regs_get_register returns the value of a register whose offset from @regs. 196 * The @offset is the offset of the register in struct pt_regs. 197 * If @offset is bigger than MAX_REG_OFFSET, this returns 0. 198 */ 199 static inline u64 regs_get_register(struct pt_regs *regs, unsigned int offset) 200 { 201 u64 val = 0; 202 203 WARN_ON(offset & 7); 204 205 offset >>= 3; 206 switch (offset) { 207 case 0 ... 30: 208 val = regs->regs[offset]; 209 break; 210 case offsetof(struct pt_regs, sp) >> 3: 211 val = regs->sp; 212 break; 213 case offsetof(struct pt_regs, pc) >> 3: 214 val = regs->pc; 215 break; 216 case offsetof(struct pt_regs, pstate) >> 3: 217 val = regs->pstate; 218 break; 219 default: 220 val = 0; 221 } 222 223 return val; 224 } 225 226 /* 227 * Read a register given an architectural register index r. 228 * This handles the common case where 31 means XZR, not SP. 229 */ 230 static inline unsigned long pt_regs_read_reg(const struct pt_regs *regs, int r) 231 { 232 return (r == 31) ? 0 : regs->regs[r]; 233 } 234 235 /* 236 * Write a register given an architectural register index r. 237 * This handles the common case where 31 means XZR, not SP. 238 */ 239 static inline void pt_regs_write_reg(struct pt_regs *regs, int r, 240 unsigned long val) 241 { 242 if (r != 31) 243 regs->regs[r] = val; 244 } 245 246 /* Valid only for Kernel mode traps. */ 247 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) 248 { 249 return regs->sp; 250 } 251 252 static inline unsigned long regs_return_value(struct pt_regs *regs) 253 { 254 return regs->regs[0]; 255 } 256 257 /* We must avoid circular header include via sched.h */ 258 struct task_struct; 259 int valid_user_regs(struct user_pt_regs *regs, struct task_struct *task); 260 261 #define GET_IP(regs) ((unsigned long)(regs)->pc) 262 #define SET_IP(regs, value) ((regs)->pc = ((u64) (value))) 263 264 #define GET_FP(ptregs) ((unsigned long)(ptregs)->regs[29]) 265 #define SET_FP(ptregs, value) ((ptregs)->regs[29] = ((u64) (value))) 266 267 #include <asm-generic/ptrace.h> 268 269 #define procedure_link_pointer(regs) ((regs)->regs[30]) 270 271 static inline void procedure_link_pointer_set(struct pt_regs *regs, 272 unsigned long val) 273 { 274 procedure_link_pointer(regs) = val; 275 } 276 277 #undef profile_pc 278 extern unsigned long profile_pc(struct pt_regs *regs); 279 280 #endif /* __ASSEMBLY__ */ 281 #endif 282