1 #ifndef _ASM_X86_PTRACE_H 2 #define _ASM_X86_PTRACE_H 3 4 #include <asm/segment.h> 5 #include <asm/page_types.h> 6 #include <uapi/asm/ptrace.h> 7 8 #ifndef __ASSEMBLY__ 9 #ifdef __i386__ 10 11 struct pt_regs { 12 unsigned long bx; 13 unsigned long cx; 14 unsigned long dx; 15 unsigned long si; 16 unsigned long di; 17 unsigned long bp; 18 unsigned long ax; 19 unsigned long ds; 20 unsigned long es; 21 unsigned long fs; 22 unsigned long gs; 23 unsigned long orig_ax; 24 unsigned long ip; 25 unsigned long cs; 26 unsigned long flags; 27 unsigned long sp; 28 unsigned long ss; 29 }; 30 31 #else /* __i386__ */ 32 33 struct pt_regs { 34 unsigned long r15; 35 unsigned long r14; 36 unsigned long r13; 37 unsigned long r12; 38 unsigned long bp; 39 unsigned long bx; 40 /* arguments: non interrupts/non tracing syscalls only save up to here*/ 41 unsigned long r11; 42 unsigned long r10; 43 unsigned long r9; 44 unsigned long r8; 45 unsigned long ax; 46 unsigned long cx; 47 unsigned long dx; 48 unsigned long si; 49 unsigned long di; 50 unsigned long orig_ax; 51 /* end of arguments */ 52 /* cpu exception frame or undefined */ 53 unsigned long ip; 54 unsigned long cs; 55 unsigned long flags; 56 unsigned long sp; 57 unsigned long ss; 58 /* top of stack page */ 59 }; 60 61 #endif /* !__i386__ */ 62 63 #include <linux/init.h> 64 #ifdef CONFIG_PARAVIRT 65 #include <asm/paravirt_types.h> 66 #endif 67 68 struct cpuinfo_x86; 69 struct task_struct; 70 71 extern unsigned long profile_pc(struct pt_regs *regs); 72 #define profile_pc profile_pc 73 74 extern unsigned long 75 convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs); 76 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, 77 int error_code, int si_code); 78 79 extern long syscall_trace_enter(struct pt_regs *); 80 extern void syscall_trace_leave(struct pt_regs *); 81 82 static inline unsigned long regs_return_value(struct pt_regs *regs) 83 { 84 return regs->ax; 85 } 86 87 /* 88 * user_mode_vm(regs) determines whether a register set came from user mode. 89 * This is true if V8086 mode was enabled OR if the register set was from 90 * protected mode with RPL-3 CS value. This tricky test checks that with 91 * one comparison. Many places in the kernel can bypass this full check 92 * if they have already ruled out V8086 mode, so user_mode(regs) can be used. 93 */ 94 static inline int user_mode(struct pt_regs *regs) 95 { 96 #ifdef CONFIG_X86_32 97 return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL; 98 #else 99 return !!(regs->cs & 3); 100 #endif 101 } 102 103 static inline int user_mode_vm(struct pt_regs *regs) 104 { 105 #ifdef CONFIG_X86_32 106 return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >= 107 USER_RPL; 108 #else 109 return user_mode(regs); 110 #endif 111 } 112 113 static inline int v8086_mode(struct pt_regs *regs) 114 { 115 #ifdef CONFIG_X86_32 116 return (regs->flags & X86_VM_MASK); 117 #else 118 return 0; /* No V86 mode support in long mode */ 119 #endif 120 } 121 122 #ifdef CONFIG_X86_64 123 static inline bool user_64bit_mode(struct pt_regs *regs) 124 { 125 #ifndef CONFIG_PARAVIRT 126 /* 127 * On non-paravirt systems, this is the only long mode CPL 3 128 * selector. We do not allow long mode selectors in the LDT. 129 */ 130 return regs->cs == __USER_CS; 131 #else 132 /* Headers are too twisted for this to go in paravirt.h. */ 133 return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs; 134 #endif 135 } 136 137 #define current_user_stack_pointer() this_cpu_read(old_rsp) 138 /* ia32 vs. x32 difference */ 139 #define compat_user_stack_pointer() \ 140 (test_thread_flag(TIF_IA32) \ 141 ? current_pt_regs()->sp \ 142 : this_cpu_read(old_rsp)) 143 #endif 144 145 #ifdef CONFIG_X86_32 146 extern unsigned long kernel_stack_pointer(struct pt_regs *regs); 147 #else 148 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) 149 { 150 return regs->sp; 151 } 152 #endif 153 154 #define GET_IP(regs) ((regs)->ip) 155 #define GET_FP(regs) ((regs)->bp) 156 #define GET_USP(regs) ((regs)->sp) 157 158 #include <asm-generic/ptrace.h> 159 160 /* Query offset/name of register from its name/offset */ 161 extern int regs_query_register_offset(const char *name); 162 extern const char *regs_query_register_name(unsigned int offset); 163 #define MAX_REG_OFFSET (offsetof(struct pt_regs, ss)) 164 165 /** 166 * regs_get_register() - get register value from its offset 167 * @regs: pt_regs from which register value is gotten. 168 * @offset: offset number of the register. 169 * 170 * regs_get_register returns the value of a register. The @offset is the 171 * offset of the register in struct pt_regs address which specified by @regs. 172 * If @offset is bigger than MAX_REG_OFFSET, this returns 0. 173 */ 174 static inline unsigned long regs_get_register(struct pt_regs *regs, 175 unsigned int offset) 176 { 177 if (unlikely(offset > MAX_REG_OFFSET)) 178 return 0; 179 #ifdef CONFIG_X86_32 180 /* 181 * Traps from the kernel do not save sp and ss. 182 * Use the helper function to retrieve sp. 183 */ 184 if (offset == offsetof(struct pt_regs, sp) && 185 regs->cs == __KERNEL_CS) 186 return kernel_stack_pointer(regs); 187 #endif 188 return *(unsigned long *)((unsigned long)regs + offset); 189 } 190 191 /** 192 * regs_within_kernel_stack() - check the address in the stack 193 * @regs: pt_regs which contains kernel stack pointer. 194 * @addr: address which is checked. 195 * 196 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). 197 * If @addr is within the kernel stack, it returns true. If not, returns false. 198 */ 199 static inline int regs_within_kernel_stack(struct pt_regs *regs, 200 unsigned long addr) 201 { 202 return ((addr & ~(THREAD_SIZE - 1)) == 203 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); 204 } 205 206 /** 207 * regs_get_kernel_stack_nth() - get Nth entry of the stack 208 * @regs: pt_regs which contains kernel stack pointer. 209 * @n: stack entry number. 210 * 211 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which 212 * is specified by @regs. If the @n th entry is NOT in the kernel stack, 213 * this returns 0. 214 */ 215 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, 216 unsigned int n) 217 { 218 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); 219 addr += n; 220 if (regs_within_kernel_stack(regs, (unsigned long)addr)) 221 return *addr; 222 else 223 return 0; 224 } 225 226 #define arch_has_single_step() (1) 227 #ifdef CONFIG_X86_DEBUGCTLMSR 228 #define arch_has_block_step() (1) 229 #else 230 #define arch_has_block_step() (boot_cpu_data.x86 >= 6) 231 #endif 232 233 #define ARCH_HAS_USER_SINGLE_STEP_INFO 234 235 struct user_desc; 236 extern int do_get_thread_area(struct task_struct *p, int idx, 237 struct user_desc __user *info); 238 extern int do_set_thread_area(struct task_struct *p, int idx, 239 struct user_desc __user *info, int can_allocate); 240 241 #endif /* !__ASSEMBLY__ */ 242 #endif /* _ASM_X86_PTRACE_H */ 243