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 #ifdef CONFIG_PARAVIRT 64 #include <asm/paravirt_types.h> 65 #endif 66 67 struct cpuinfo_x86; 68 struct task_struct; 69 70 extern unsigned long profile_pc(struct pt_regs *regs); 71 #define profile_pc profile_pc 72 73 extern unsigned long 74 convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs); 75 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, 76 int error_code, int si_code); 77 78 extern long syscall_trace_enter(struct pt_regs *); 79 extern void syscall_trace_leave(struct pt_regs *); 80 81 static inline unsigned long regs_return_value(struct pt_regs *regs) 82 { 83 return regs->ax; 84 } 85 86 /* 87 * user_mode_vm(regs) determines whether a register set came from user mode. 88 * This is true if V8086 mode was enabled OR if the register set was from 89 * protected mode with RPL-3 CS value. This tricky test checks that with 90 * one comparison. Many places in the kernel can bypass this full check 91 * if they have already ruled out V8086 mode, so user_mode(regs) can be used. 92 */ 93 static inline int user_mode(struct pt_regs *regs) 94 { 95 #ifdef CONFIG_X86_32 96 return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL; 97 #else 98 return !!(regs->cs & 3); 99 #endif 100 } 101 102 static inline int user_mode_vm(struct pt_regs *regs) 103 { 104 #ifdef CONFIG_X86_32 105 return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >= 106 USER_RPL; 107 #else 108 return user_mode(regs); 109 #endif 110 } 111 112 static inline int v8086_mode(struct pt_regs *regs) 113 { 114 #ifdef CONFIG_X86_32 115 return (regs->flags & X86_VM_MASK); 116 #else 117 return 0; /* No V86 mode support in long mode */ 118 #endif 119 } 120 121 #ifdef CONFIG_X86_64 122 static inline bool user_64bit_mode(struct pt_regs *regs) 123 { 124 #ifndef CONFIG_PARAVIRT 125 /* 126 * On non-paravirt systems, this is the only long mode CPL 3 127 * selector. We do not allow long mode selectors in the LDT. 128 */ 129 return regs->cs == __USER_CS; 130 #else 131 /* Headers are too twisted for this to go in paravirt.h. */ 132 return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs; 133 #endif 134 } 135 136 #define current_user_stack_pointer() this_cpu_read(old_rsp) 137 /* ia32 vs. x32 difference */ 138 #define compat_user_stack_pointer() \ 139 (test_thread_flag(TIF_IA32) \ 140 ? current_pt_regs()->sp \ 141 : this_cpu_read(old_rsp)) 142 #endif 143 144 #ifdef CONFIG_X86_32 145 extern unsigned long kernel_stack_pointer(struct pt_regs *regs); 146 #else 147 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) 148 { 149 return regs->sp; 150 } 151 #endif 152 153 #define GET_IP(regs) ((regs)->ip) 154 #define GET_FP(regs) ((regs)->bp) 155 #define GET_USP(regs) ((regs)->sp) 156 157 #include <asm-generic/ptrace.h> 158 159 /* Query offset/name of register from its name/offset */ 160 extern int regs_query_register_offset(const char *name); 161 extern const char *regs_query_register_name(unsigned int offset); 162 #define MAX_REG_OFFSET (offsetof(struct pt_regs, ss)) 163 164 /** 165 * regs_get_register() - get register value from its offset 166 * @regs: pt_regs from which register value is gotten. 167 * @offset: offset number of the register. 168 * 169 * regs_get_register returns the value of a register. The @offset is the 170 * offset of the register in struct pt_regs address which specified by @regs. 171 * If @offset is bigger than MAX_REG_OFFSET, this returns 0. 172 */ 173 static inline unsigned long regs_get_register(struct pt_regs *regs, 174 unsigned int offset) 175 { 176 if (unlikely(offset > MAX_REG_OFFSET)) 177 return 0; 178 #ifdef CONFIG_X86_32 179 /* 180 * Traps from the kernel do not save sp and ss. 181 * Use the helper function to retrieve sp. 182 */ 183 if (offset == offsetof(struct pt_regs, sp) && 184 regs->cs == __KERNEL_CS) 185 return kernel_stack_pointer(regs); 186 #endif 187 return *(unsigned long *)((unsigned long)regs + offset); 188 } 189 190 /** 191 * regs_within_kernel_stack() - check the address in the stack 192 * @regs: pt_regs which contains kernel stack pointer. 193 * @addr: address which is checked. 194 * 195 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). 196 * If @addr is within the kernel stack, it returns true. If not, returns false. 197 */ 198 static inline int regs_within_kernel_stack(struct pt_regs *regs, 199 unsigned long addr) 200 { 201 return ((addr & ~(THREAD_SIZE - 1)) == 202 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); 203 } 204 205 /** 206 * regs_get_kernel_stack_nth() - get Nth entry of the stack 207 * @regs: pt_regs which contains kernel stack pointer. 208 * @n: stack entry number. 209 * 210 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which 211 * is specified by @regs. If the @n th entry is NOT in the kernel stack, 212 * this returns 0. 213 */ 214 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, 215 unsigned int n) 216 { 217 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); 218 addr += n; 219 if (regs_within_kernel_stack(regs, (unsigned long)addr)) 220 return *addr; 221 else 222 return 0; 223 } 224 225 #define arch_has_single_step() (1) 226 #ifdef CONFIG_X86_DEBUGCTLMSR 227 #define arch_has_block_step() (1) 228 #else 229 #define arch_has_block_step() (boot_cpu_data.x86 >= 6) 230 #endif 231 232 #define ARCH_HAS_USER_SINGLE_STEP_INFO 233 234 /* 235 * When hitting ptrace_stop(), we cannot return using SYSRET because 236 * that does not restore the full CPU state, only a minimal set. The 237 * ptracer can change arbitrary register values, which is usually okay 238 * because the usual ptrace stops run off the signal delivery path which 239 * forces IRET; however, ptrace_event() stops happen in arbitrary places 240 * in the kernel and don't force IRET path. 241 * 242 * So force IRET path after a ptrace stop. 243 */ 244 #define arch_ptrace_stop_needed(code, info) \ 245 ({ \ 246 set_thread_flag(TIF_NOTIFY_RESUME); \ 247 false; \ 248 }) 249 250 struct user_desc; 251 extern int do_get_thread_area(struct task_struct *p, int idx, 252 struct user_desc __user *info); 253 extern int do_set_thread_area(struct task_struct *p, int idx, 254 struct user_desc __user *info, int can_allocate); 255 256 #endif /* !__ASSEMBLY__ */ 257 #endif /* _ASM_X86_PTRACE_H */ 258