1 /* 2 * arch/arm/include/asm/ptrace.h 3 * 4 * Copyright (C) 1996-2003 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 #ifndef __ASM_ARM_PTRACE_H 11 #define __ASM_ARM_PTRACE_H 12 13 #include <uapi/asm/ptrace.h> 14 15 #ifndef __ASSEMBLY__ 16 #include <linux/types.h> 17 18 struct pt_regs { 19 unsigned long uregs[18]; 20 }; 21 22 struct svc_pt_regs { 23 struct pt_regs regs; 24 u32 dacr; 25 u32 addr_limit; 26 }; 27 28 #define to_svc_pt_regs(r) container_of(r, struct svc_pt_regs, regs) 29 30 #define user_mode(regs) \ 31 (((regs)->ARM_cpsr & 0xf) == 0) 32 33 #ifdef CONFIG_ARM_THUMB 34 #define thumb_mode(regs) \ 35 (((regs)->ARM_cpsr & PSR_T_BIT)) 36 #else 37 #define thumb_mode(regs) (0) 38 #endif 39 40 #ifndef CONFIG_CPU_V7M 41 #define isa_mode(regs) \ 42 ((((regs)->ARM_cpsr & PSR_J_BIT) >> (__ffs(PSR_J_BIT) - 1)) | \ 43 (((regs)->ARM_cpsr & PSR_T_BIT) >> (__ffs(PSR_T_BIT)))) 44 #else 45 #define isa_mode(regs) 1 /* Thumb */ 46 #endif 47 48 #define processor_mode(regs) \ 49 ((regs)->ARM_cpsr & MODE_MASK) 50 51 #define interrupts_enabled(regs) \ 52 (!((regs)->ARM_cpsr & PSR_I_BIT)) 53 54 #define fast_interrupts_enabled(regs) \ 55 (!((regs)->ARM_cpsr & PSR_F_BIT)) 56 57 /* Are the current registers suitable for user mode? 58 * (used to maintain security in signal handlers) 59 */ 60 static inline int valid_user_regs(struct pt_regs *regs) 61 { 62 #ifndef CONFIG_CPU_V7M 63 unsigned long mode = regs->ARM_cpsr & MODE_MASK; 64 65 /* 66 * Always clear the F (FIQ) and A (delayed abort) bits 67 */ 68 regs->ARM_cpsr &= ~(PSR_F_BIT | PSR_A_BIT); 69 70 if ((regs->ARM_cpsr & PSR_I_BIT) == 0) { 71 if (mode == USR_MODE) 72 return 1; 73 if (elf_hwcap & HWCAP_26BIT && mode == USR26_MODE) 74 return 1; 75 } 76 77 /* 78 * Force CPSR to something logical... 79 */ 80 regs->ARM_cpsr &= PSR_f | PSR_s | PSR_x | PSR_T_BIT | MODE32_BIT; 81 if (!(elf_hwcap & HWCAP_26BIT)) 82 regs->ARM_cpsr |= USR_MODE; 83 84 return 0; 85 #else /* ifndef CONFIG_CPU_V7M */ 86 return 1; 87 #endif 88 } 89 90 static inline long regs_return_value(struct pt_regs *regs) 91 { 92 return regs->ARM_r0; 93 } 94 95 #define instruction_pointer(regs) (regs)->ARM_pc 96 97 #ifdef CONFIG_THUMB2_KERNEL 98 #define frame_pointer(regs) (regs)->ARM_r7 99 #else 100 #define frame_pointer(regs) (regs)->ARM_fp 101 #endif 102 103 static inline void instruction_pointer_set(struct pt_regs *regs, 104 unsigned long val) 105 { 106 instruction_pointer(regs) = val; 107 } 108 109 #ifdef CONFIG_SMP 110 extern unsigned long profile_pc(struct pt_regs *regs); 111 #else 112 #define profile_pc(regs) instruction_pointer(regs) 113 #endif 114 115 #define predicate(x) ((x) & 0xf0000000) 116 #define PREDICATE_ALWAYS 0xe0000000 117 118 /* 119 * True if instr is a 32-bit thumb instruction. This works if instr 120 * is the first or only half-word of a thumb instruction. It also works 121 * when instr holds all 32-bits of a wide thumb instruction if stored 122 * in the form (first_half<<16)|(second_half) 123 */ 124 #define is_wide_instruction(instr) ((unsigned)(instr) >= 0xe800) 125 126 /* 127 * kprobe-based event tracer support 128 */ 129 #include <linux/stddef.h> 130 #include <linux/types.h> 131 #define MAX_REG_OFFSET (offsetof(struct pt_regs, ARM_ORIG_r0)) 132 133 extern int regs_query_register_offset(const char *name); 134 extern const char *regs_query_register_name(unsigned int offset); 135 extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr); 136 extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, 137 unsigned int n); 138 139 /** 140 * regs_get_register() - get register value from its offset 141 * @regs: pt_regs from which register value is gotten 142 * @offset: offset number of the register. 143 * 144 * regs_get_register returns the value of a register whose offset from @regs. 145 * The @offset is the offset of the register in struct pt_regs. 146 * If @offset is bigger than MAX_REG_OFFSET, this returns 0. 147 */ 148 static inline unsigned long regs_get_register(struct pt_regs *regs, 149 unsigned int offset) 150 { 151 if (unlikely(offset > MAX_REG_OFFSET)) 152 return 0; 153 return *(unsigned long *)((unsigned long)regs + offset); 154 } 155 156 /* Valid only for Kernel mode traps. */ 157 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) 158 { 159 return regs->ARM_sp; 160 } 161 162 static inline unsigned long user_stack_pointer(struct pt_regs *regs) 163 { 164 return regs->ARM_sp; 165 } 166 167 #define current_pt_regs(void) ({ (struct pt_regs *) \ 168 ((current_stack_pointer | (THREAD_SIZE - 1)) - 7) - 1; \ 169 }) 170 171 #endif /* __ASSEMBLY__ */ 172 #endif 173