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 /* 35 * C ABI says these regs are callee-preserved. They aren't saved on kernel entry 36 * unless syscall needs a complete, fully filled "struct pt_regs". 37 */ 38 unsigned long r15; 39 unsigned long r14; 40 unsigned long r13; 41 unsigned long r12; 42 unsigned long bp; 43 unsigned long bx; 44 /* These regs are callee-clobbered. Always saved on kernel entry. */ 45 unsigned long r11; 46 unsigned long r10; 47 unsigned long r9; 48 unsigned long r8; 49 unsigned long ax; 50 unsigned long cx; 51 unsigned long dx; 52 unsigned long si; 53 unsigned long di; 54 /* 55 * On syscall entry, this is syscall#. On CPU exception, this is error code. 56 * On hw interrupt, it's IRQ number: 57 */ 58 unsigned long orig_ax; 59 /* Return frame for iretq */ 60 unsigned long ip; 61 unsigned long cs; 62 unsigned long flags; 63 unsigned long sp; 64 unsigned long ss; 65 /* top of stack page */ 66 }; 67 68 #endif /* !__i386__ */ 69 70 #ifdef CONFIG_PARAVIRT 71 #include <asm/paravirt_types.h> 72 #endif 73 74 struct cpuinfo_x86; 75 struct task_struct; 76 77 extern unsigned long profile_pc(struct pt_regs *regs); 78 #define profile_pc profile_pc 79 80 extern unsigned long 81 convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs); 82 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, 83 int error_code, int si_code); 84 85 86 extern unsigned long syscall_trace_enter_phase1(struct pt_regs *, u32 arch); 87 extern long syscall_trace_enter_phase2(struct pt_regs *, u32 arch, 88 unsigned long phase1_result); 89 90 extern long syscall_trace_enter(struct pt_regs *); 91 92 static inline unsigned long regs_return_value(struct pt_regs *regs) 93 { 94 return regs->ax; 95 } 96 97 /* 98 * user_mode(regs) determines whether a register set came from user 99 * mode. On x86_32, this is true if V8086 mode was enabled OR if the 100 * register set was from protected mode with RPL-3 CS value. This 101 * tricky test checks that with one comparison. 102 * 103 * On x86_64, vm86 mode is mercifully nonexistent, and we don't need 104 * the extra check. 105 */ 106 static inline int user_mode(struct pt_regs *regs) 107 { 108 #ifdef CONFIG_X86_32 109 return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >= USER_RPL; 110 #else 111 return !!(regs->cs & 3); 112 #endif 113 } 114 115 static inline int v8086_mode(struct pt_regs *regs) 116 { 117 #ifdef CONFIG_X86_32 118 return (regs->flags & X86_VM_MASK); 119 #else 120 return 0; /* No V86 mode support in long mode */ 121 #endif 122 } 123 124 #ifdef CONFIG_X86_64 125 static inline bool user_64bit_mode(struct pt_regs *regs) 126 { 127 #ifndef CONFIG_PARAVIRT 128 /* 129 * On non-paravirt systems, this is the only long mode CPL 3 130 * selector. We do not allow long mode selectors in the LDT. 131 */ 132 return regs->cs == __USER_CS; 133 #else 134 /* Headers are too twisted for this to go in paravirt.h. */ 135 return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs; 136 #endif 137 } 138 139 #define current_user_stack_pointer() current_pt_regs()->sp 140 #define compat_user_stack_pointer() current_pt_regs()->sp 141 #endif 142 143 #ifdef CONFIG_X86_32 144 extern unsigned long kernel_stack_pointer(struct pt_regs *regs); 145 #else 146 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) 147 { 148 return regs->sp; 149 } 150 #endif 151 152 #define GET_IP(regs) ((regs)->ip) 153 #define GET_FP(regs) ((regs)->bp) 154 #define GET_USP(regs) ((regs)->sp) 155 156 #include <asm-generic/ptrace.h> 157 158 /* Query offset/name of register from its name/offset */ 159 extern int regs_query_register_offset(const char *name); 160 extern const char *regs_query_register_name(unsigned int offset); 161 #define MAX_REG_OFFSET (offsetof(struct pt_regs, ss)) 162 163 /** 164 * regs_get_register() - get register value from its offset 165 * @regs: pt_regs from which register value is gotten. 166 * @offset: offset number of the register. 167 * 168 * regs_get_register returns the value of a register. The @offset is the 169 * offset of the register in struct pt_regs address which specified by @regs. 170 * If @offset is bigger than MAX_REG_OFFSET, this returns 0. 171 */ 172 static inline unsigned long regs_get_register(struct pt_regs *regs, 173 unsigned int offset) 174 { 175 if (unlikely(offset > MAX_REG_OFFSET)) 176 return 0; 177 #ifdef CONFIG_X86_32 178 /* 179 * Traps from the kernel do not save sp and ss. 180 * Use the helper function to retrieve sp. 181 */ 182 if (offset == offsetof(struct pt_regs, sp) && 183 regs->cs == __KERNEL_CS) 184 return kernel_stack_pointer(regs); 185 #endif 186 return *(unsigned long *)((unsigned long)regs + offset); 187 } 188 189 /** 190 * regs_within_kernel_stack() - check the address in the stack 191 * @regs: pt_regs which contains kernel stack pointer. 192 * @addr: address which is checked. 193 * 194 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). 195 * If @addr is within the kernel stack, it returns true. If not, returns false. 196 */ 197 static inline int regs_within_kernel_stack(struct pt_regs *regs, 198 unsigned long addr) 199 { 200 return ((addr & ~(THREAD_SIZE - 1)) == 201 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); 202 } 203 204 /** 205 * regs_get_kernel_stack_nth() - get Nth entry of the stack 206 * @regs: pt_regs which contains kernel stack pointer. 207 * @n: stack entry number. 208 * 209 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which 210 * is specified by @regs. If the @n th entry is NOT in the kernel stack, 211 * this returns 0. 212 */ 213 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, 214 unsigned int n) 215 { 216 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); 217 addr += n; 218 if (regs_within_kernel_stack(regs, (unsigned long)addr)) 219 return *addr; 220 else 221 return 0; 222 } 223 224 #define arch_has_single_step() (1) 225 #ifdef CONFIG_X86_DEBUGCTLMSR 226 #define arch_has_block_step() (1) 227 #else 228 #define arch_has_block_step() (boot_cpu_data.x86 >= 6) 229 #endif 230 231 #define ARCH_HAS_USER_SINGLE_STEP_INFO 232 233 /* 234 * When hitting ptrace_stop(), we cannot return using SYSRET because 235 * that does not restore the full CPU state, only a minimal set. The 236 * ptracer can change arbitrary register values, which is usually okay 237 * because the usual ptrace stops run off the signal delivery path which 238 * forces IRET; however, ptrace_event() stops happen in arbitrary places 239 * in the kernel and don't force IRET path. 240 * 241 * So force IRET path after a ptrace stop. 242 */ 243 #define arch_ptrace_stop_needed(code, info) \ 244 ({ \ 245 force_iret(); \ 246 false; \ 247 }) 248 249 struct user_desc; 250 extern int do_get_thread_area(struct task_struct *p, int idx, 251 struct user_desc __user *info); 252 extern int do_set_thread_area(struct task_struct *p, int idx, 253 struct user_desc __user *info, int can_allocate); 254 255 #endif /* !__ASSEMBLY__ */ 256 #endif /* _ASM_X86_PTRACE_H */ 257