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 static inline unsigned long regs_return_value(struct pt_regs *regs) 87 { 88 return regs->ax; 89 } 90 91 /* 92 * user_mode(regs) determines whether a register set came from user 93 * mode. On x86_32, this is true if V8086 mode was enabled OR if the 94 * register set was from protected mode with RPL-3 CS value. This 95 * tricky test checks that with one comparison. 96 * 97 * On x86_64, vm86 mode is mercifully nonexistent, and we don't need 98 * the extra check. 99 */ 100 static inline int user_mode(struct pt_regs *regs) 101 { 102 #ifdef CONFIG_X86_32 103 return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >= USER_RPL; 104 #else 105 return !!(regs->cs & 3); 106 #endif 107 } 108 109 static inline int v8086_mode(struct pt_regs *regs) 110 { 111 #ifdef CONFIG_X86_32 112 return (regs->flags & X86_VM_MASK); 113 #else 114 return 0; /* No V86 mode support in long mode */ 115 #endif 116 } 117 118 #ifdef CONFIG_X86_64 119 static inline bool user_64bit_mode(struct pt_regs *regs) 120 { 121 #ifndef CONFIG_PARAVIRT 122 /* 123 * On non-paravirt systems, this is the only long mode CPL 3 124 * selector. We do not allow long mode selectors in the LDT. 125 */ 126 return regs->cs == __USER_CS; 127 #else 128 /* Headers are too twisted for this to go in paravirt.h. */ 129 return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs; 130 #endif 131 } 132 133 #define current_user_stack_pointer() current_pt_regs()->sp 134 #define compat_user_stack_pointer() current_pt_regs()->sp 135 #endif 136 137 #ifdef CONFIG_X86_32 138 extern unsigned long kernel_stack_pointer(struct pt_regs *regs); 139 #else 140 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) 141 { 142 return regs->sp; 143 } 144 #endif 145 146 #define GET_IP(regs) ((regs)->ip) 147 #define GET_FP(regs) ((regs)->bp) 148 #define GET_USP(regs) ((regs)->sp) 149 150 #include <asm-generic/ptrace.h> 151 152 /* Query offset/name of register from its name/offset */ 153 extern int regs_query_register_offset(const char *name); 154 extern const char *regs_query_register_name(unsigned int offset); 155 #define MAX_REG_OFFSET (offsetof(struct pt_regs, ss)) 156 157 /** 158 * regs_get_register() - get register value from its offset 159 * @regs: pt_regs from which register value is gotten. 160 * @offset: offset number of the register. 161 * 162 * regs_get_register returns the value of a register. The @offset is the 163 * offset of the register in struct pt_regs address which specified by @regs. 164 * If @offset is bigger than MAX_REG_OFFSET, this returns 0. 165 */ 166 static inline unsigned long regs_get_register(struct pt_regs *regs, 167 unsigned int offset) 168 { 169 if (unlikely(offset > MAX_REG_OFFSET)) 170 return 0; 171 #ifdef CONFIG_X86_32 172 /* 173 * Traps from the kernel do not save sp and ss. 174 * Use the helper function to retrieve sp. 175 */ 176 if (offset == offsetof(struct pt_regs, sp) && 177 regs->cs == __KERNEL_CS) 178 return kernel_stack_pointer(regs); 179 #endif 180 return *(unsigned long *)((unsigned long)regs + offset); 181 } 182 183 /** 184 * regs_within_kernel_stack() - check the address in the stack 185 * @regs: pt_regs which contains kernel stack pointer. 186 * @addr: address which is checked. 187 * 188 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). 189 * If @addr is within the kernel stack, it returns true. If not, returns false. 190 */ 191 static inline int regs_within_kernel_stack(struct pt_regs *regs, 192 unsigned long addr) 193 { 194 return ((addr & ~(THREAD_SIZE - 1)) == 195 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); 196 } 197 198 /** 199 * regs_get_kernel_stack_nth() - get Nth entry of the stack 200 * @regs: pt_regs which contains kernel stack pointer. 201 * @n: stack entry number. 202 * 203 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which 204 * is specified by @regs. If the @n th entry is NOT in the kernel stack, 205 * this returns 0. 206 */ 207 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, 208 unsigned int n) 209 { 210 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); 211 addr += n; 212 if (regs_within_kernel_stack(regs, (unsigned long)addr)) 213 return *addr; 214 else 215 return 0; 216 } 217 218 #define arch_has_single_step() (1) 219 #ifdef CONFIG_X86_DEBUGCTLMSR 220 #define arch_has_block_step() (1) 221 #else 222 #define arch_has_block_step() (boot_cpu_data.x86 >= 6) 223 #endif 224 225 #define ARCH_HAS_USER_SINGLE_STEP_INFO 226 227 /* 228 * When hitting ptrace_stop(), we cannot return using SYSRET because 229 * that does not restore the full CPU state, only a minimal set. The 230 * ptracer can change arbitrary register values, which is usually okay 231 * because the usual ptrace stops run off the signal delivery path which 232 * forces IRET; however, ptrace_event() stops happen in arbitrary places 233 * in the kernel and don't force IRET path. 234 * 235 * So force IRET path after a ptrace stop. 236 */ 237 #define arch_ptrace_stop_needed(code, info) \ 238 ({ \ 239 force_iret(); \ 240 false; \ 241 }) 242 243 struct user_desc; 244 extern int do_get_thread_area(struct task_struct *p, int idx, 245 struct user_desc __user *info); 246 extern int do_set_thread_area(struct task_struct *p, int idx, 247 struct user_desc __user *info, int can_allocate); 248 249 #endif /* !__ASSEMBLY__ */ 250 #endif /* _ASM_X86_PTRACE_H */ 251