H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 1 | #ifndef _ASM_X86_PTRACE_H |
| 2 | #define _ASM_X86_PTRACE_H |
Thomas Gleixner | 8fc37f2 | 2007-10-23 22:37:24 +0200 | [diff] [blame] | 3 | |
| 4 | #include <linux/compiler.h> /* For __user */ |
| 5 | #include <asm/ptrace-abi.h> |
Vegard Nossum | 6330a30 | 2008-05-28 09:46:19 +0200 | [diff] [blame] | 6 | #include <asm/processor-flags.h> |
Thomas Gleixner | 8fc37f2 | 2007-10-23 22:37:24 +0200 | [diff] [blame] | 7 | |
Vegard Nossum | 6330a30 | 2008-05-28 09:46:19 +0200 | [diff] [blame] | 8 | #ifdef __KERNEL__ |
Vegard Nossum | 6330a30 | 2008-05-28 09:46:19 +0200 | [diff] [blame] | 9 | #include <asm/segment.h> |
Masami Hiramatsu | b1cf540 | 2009-08-13 16:34:44 -0400 | [diff] [blame] | 10 | #include <asm/page_types.h> |
Vegard Nossum | 6330a30 | 2008-05-28 09:46:19 +0200 | [diff] [blame] | 11 | #endif |
Markus Metzger | eee3af4 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 12 | |
Thomas Gleixner | 8fc37f2 | 2007-10-23 22:37:24 +0200 | [diff] [blame] | 13 | #ifndef __ASSEMBLY__ |
| 14 | |
| 15 | #ifdef __i386__ |
| 16 | /* this struct defines the way the registers are stored on the |
| 17 | stack during a system call. */ |
| 18 | |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 19 | #ifndef __KERNEL__ |
| 20 | |
Thomas Gleixner | 8fc37f2 | 2007-10-23 22:37:24 +0200 | [diff] [blame] | 21 | struct pt_regs { |
| 22 | long ebx; |
| 23 | long ecx; |
| 24 | long edx; |
| 25 | long esi; |
| 26 | long edi; |
| 27 | long ebp; |
| 28 | long eax; |
| 29 | int xds; |
| 30 | int xes; |
| 31 | int xfs; |
Tejun Heo | ccbeed3 | 2009-02-09 22:17:40 +0900 | [diff] [blame] | 32 | int xgs; |
Thomas Gleixner | 8fc37f2 | 2007-10-23 22:37:24 +0200 | [diff] [blame] | 33 | long orig_eax; |
| 34 | long eip; |
| 35 | int xcs; |
| 36 | long eflags; |
| 37 | long esp; |
| 38 | int xss; |
| 39 | }; |
| 40 | |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 41 | #else /* __KERNEL__ */ |
| 42 | |
| 43 | struct pt_regs { |
Harvey Harrison | 92bc205 | 2008-02-08 12:09:56 -0800 | [diff] [blame] | 44 | unsigned long bx; |
| 45 | unsigned long cx; |
| 46 | unsigned long dx; |
| 47 | unsigned long si; |
| 48 | unsigned long di; |
| 49 | unsigned long bp; |
Harvey Harrison | 9902a70 | 2008-02-08 12:09:57 -0800 | [diff] [blame] | 50 | unsigned long ax; |
Harvey Harrison | 92bc205 | 2008-02-08 12:09:56 -0800 | [diff] [blame] | 51 | unsigned long ds; |
| 52 | unsigned long es; |
| 53 | unsigned long fs; |
Tejun Heo | ccbeed3 | 2009-02-09 22:17:40 +0900 | [diff] [blame] | 54 | unsigned long gs; |
Harvey Harrison | 9902a70 | 2008-02-08 12:09:57 -0800 | [diff] [blame] | 55 | unsigned long orig_ax; |
Harvey Harrison | 92bc205 | 2008-02-08 12:09:56 -0800 | [diff] [blame] | 56 | unsigned long ip; |
| 57 | unsigned long cs; |
| 58 | unsigned long flags; |
| 59 | unsigned long sp; |
| 60 | unsigned long ss; |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 61 | }; |
Thomas Gleixner | 8fc37f2 | 2007-10-23 22:37:24 +0200 | [diff] [blame] | 62 | |
Thomas Gleixner | 8fc37f2 | 2007-10-23 22:37:24 +0200 | [diff] [blame] | 63 | #endif /* __KERNEL__ */ |
| 64 | |
| 65 | #else /* __i386__ */ |
| 66 | |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 67 | #ifndef __KERNEL__ |
| 68 | |
Thomas Gleixner | 8fc37f2 | 2007-10-23 22:37:24 +0200 | [diff] [blame] | 69 | struct pt_regs { |
| 70 | unsigned long r15; |
| 71 | unsigned long r14; |
| 72 | unsigned long r13; |
| 73 | unsigned long r12; |
| 74 | unsigned long rbp; |
| 75 | unsigned long rbx; |
Lucas De Marchi | 0d2eb44 | 2011-03-17 16:24:16 -0300 | [diff] [blame] | 76 | /* arguments: non interrupts/non tracing syscalls only save up to here*/ |
Thomas Gleixner | 8fc37f2 | 2007-10-23 22:37:24 +0200 | [diff] [blame] | 77 | unsigned long r11; |
| 78 | unsigned long r10; |
| 79 | unsigned long r9; |
| 80 | unsigned long r8; |
| 81 | unsigned long rax; |
| 82 | unsigned long rcx; |
| 83 | unsigned long rdx; |
| 84 | unsigned long rsi; |
| 85 | unsigned long rdi; |
| 86 | unsigned long orig_rax; |
| 87 | /* end of arguments */ |
| 88 | /* cpu exception frame or undefined */ |
| 89 | unsigned long rip; |
| 90 | unsigned long cs; |
| 91 | unsigned long eflags; |
| 92 | unsigned long rsp; |
| 93 | unsigned long ss; |
| 94 | /* top of stack page */ |
| 95 | }; |
| 96 | |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 97 | #else /* __KERNEL__ */ |
| 98 | |
| 99 | struct pt_regs { |
| 100 | unsigned long r15; |
| 101 | unsigned long r14; |
| 102 | unsigned long r13; |
| 103 | unsigned long r12; |
| 104 | unsigned long bp; |
| 105 | unsigned long bx; |
Lucas De Marchi | 0d2eb44 | 2011-03-17 16:24:16 -0300 | [diff] [blame] | 106 | /* arguments: non interrupts/non tracing syscalls only save up to here*/ |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 107 | unsigned long r11; |
| 108 | unsigned long r10; |
| 109 | unsigned long r9; |
| 110 | unsigned long r8; |
| 111 | unsigned long ax; |
| 112 | unsigned long cx; |
| 113 | unsigned long dx; |
| 114 | unsigned long si; |
| 115 | unsigned long di; |
| 116 | unsigned long orig_ax; |
| 117 | /* end of arguments */ |
| 118 | /* cpu exception frame or undefined */ |
| 119 | unsigned long ip; |
| 120 | unsigned long cs; |
| 121 | unsigned long flags; |
| 122 | unsigned long sp; |
| 123 | unsigned long ss; |
| 124 | /* top of stack page */ |
| 125 | }; |
Thomas Gleixner | 8fc37f2 | 2007-10-23 22:37:24 +0200 | [diff] [blame] | 126 | |
Thomas Gleixner | 8fc37f2 | 2007-10-23 22:37:24 +0200 | [diff] [blame] | 127 | #endif /* __KERNEL__ */ |
| 128 | #endif /* !__i386__ */ |
Roland McGrath | efd1ca5 | 2008-01-30 13:30:46 +0100 | [diff] [blame] | 129 | |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 130 | |
Roland McGrath | efd1ca5 | 2008-01-30 13:30:46 +0100 | [diff] [blame] | 131 | #ifdef __KERNEL__ |
| 132 | |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 133 | #include <linux/init.h> |
Harvey Harrison | dbe3533 | 2008-01-30 13:33:16 +0100 | [diff] [blame] | 134 | |
Markus Metzger | 93fa763 | 2008-04-08 11:01:58 +0200 | [diff] [blame] | 135 | struct cpuinfo_x86; |
Harvey Harrison | dbe3533 | 2008-01-30 13:33:16 +0100 | [diff] [blame] | 136 | struct task_struct; |
| 137 | |
Harvey Harrison | dbe3533 | 2008-01-30 13:33:16 +0100 | [diff] [blame] | 138 | extern unsigned long profile_pc(struct pt_regs *regs); |
Mike Frysinger | c46dd6b | 2011-05-26 16:25:43 -0700 | [diff] [blame] | 139 | #define profile_pc profile_pc |
Harvey Harrison | dbe3533 | 2008-01-30 13:33:16 +0100 | [diff] [blame] | 140 | |
| 141 | extern unsigned long |
| 142 | convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs); |
Joe Perches | 72f74fa | 2008-03-23 01:03:17 -0700 | [diff] [blame] | 143 | extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, |
Srinivasa Ds | da654b7 | 2008-09-23 15:23:52 +0530 | [diff] [blame] | 144 | int error_code, int si_code); |
Hiroshi Shimamoto | 72fa50f | 2008-09-05 16:27:11 -0700 | [diff] [blame] | 145 | void signal_fault(struct pt_regs *regs, void __user *frame, char *where); |
| 146 | |
Jaswinder Singh | c1686ae | 2008-07-21 22:35:38 +0530 | [diff] [blame] | 147 | extern long syscall_trace_enter(struct pt_regs *); |
| 148 | extern void syscall_trace_leave(struct pt_regs *); |
| 149 | |
Harvey Harrison | 9902a70 | 2008-02-08 12:09:57 -0800 | [diff] [blame] | 150 | static inline unsigned long regs_return_value(struct pt_regs *regs) |
| 151 | { |
| 152 | return regs->ax; |
| 153 | } |
Harvey Harrison | dbe3533 | 2008-01-30 13:33:16 +0100 | [diff] [blame] | 154 | |
Roland McGrath | 7f23234 | 2008-01-30 13:30:48 +0100 | [diff] [blame] | 155 | /* |
Harvey Harrison | 90d43d7 | 2008-01-30 13:33:16 +0100 | [diff] [blame] | 156 | * user_mode_vm(regs) determines whether a register set came from user mode. |
| 157 | * This is true if V8086 mode was enabled OR if the register set was from |
| 158 | * protected mode with RPL-3 CS value. This tricky test checks that with |
| 159 | * one comparison. Many places in the kernel can bypass this full check |
| 160 | * if they have already ruled out V8086 mode, so user_mode(regs) can be used. |
| 161 | */ |
| 162 | static inline int user_mode(struct pt_regs *regs) |
| 163 | { |
| 164 | #ifdef CONFIG_X86_32 |
| 165 | return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL; |
| 166 | #else |
| 167 | return !!(regs->cs & 3); |
| 168 | #endif |
| 169 | } |
| 170 | |
| 171 | static inline int user_mode_vm(struct pt_regs *regs) |
| 172 | { |
| 173 | #ifdef CONFIG_X86_32 |
gorcunov@gmail.com | 6b6891f | 2008-03-28 17:56:57 +0300 | [diff] [blame] | 174 | return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >= |
Joe Perches | 72f74fa | 2008-03-23 01:03:17 -0700 | [diff] [blame] | 175 | USER_RPL; |
Harvey Harrison | 90d43d7 | 2008-01-30 13:33:16 +0100 | [diff] [blame] | 176 | #else |
| 177 | return user_mode(regs); |
| 178 | #endif |
| 179 | } |
| 180 | |
| 181 | static inline int v8086_mode(struct pt_regs *regs) |
| 182 | { |
| 183 | #ifdef CONFIG_X86_32 |
gorcunov@gmail.com | 6b6891f | 2008-03-28 17:56:57 +0300 | [diff] [blame] | 184 | return (regs->flags & X86_VM_MASK); |
Harvey Harrison | 90d43d7 | 2008-01-30 13:33:16 +0100 | [diff] [blame] | 185 | #else |
| 186 | return 0; /* No V86 mode support in long mode */ |
| 187 | #endif |
| 188 | } |
| 189 | |
Harvey Harrison | f6e8e28 | 2008-01-30 13:33:16 +0100 | [diff] [blame] | 190 | /* |
| 191 | * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode |
Masami Hiramatsu | 7b6c6c7 | 2009-05-11 17:03:00 -0400 | [diff] [blame] | 192 | * when it traps. The previous stack will be directly underneath the saved |
| 193 | * registers, and 'sp/ss' won't even have been saved. Thus the '®s->sp'. |
Harvey Harrison | f6e8e28 | 2008-01-30 13:33:16 +0100 | [diff] [blame] | 194 | * |
| 195 | * This is valid only for kernel mode traps. |
| 196 | */ |
Masami Hiramatsu | 7b6c6c7 | 2009-05-11 17:03:00 -0400 | [diff] [blame] | 197 | static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) |
Harvey Harrison | 90d43d7 | 2008-01-30 13:33:16 +0100 | [diff] [blame] | 198 | { |
| 199 | #ifdef CONFIG_X86_32 |
Masami Hiramatsu | 7b6c6c7 | 2009-05-11 17:03:00 -0400 | [diff] [blame] | 200 | return (unsigned long)(®s->sp); |
Harvey Harrison | 90d43d7 | 2008-01-30 13:33:16 +0100 | [diff] [blame] | 201 | #else |
| 202 | return regs->sp; |
| 203 | #endif |
| 204 | } |
| 205 | |
Mike Frysinger | c46dd6b | 2011-05-26 16:25:43 -0700 | [diff] [blame] | 206 | #define GET_IP(regs) ((regs)->ip) |
| 207 | #define GET_FP(regs) ((regs)->bp) |
| 208 | #define GET_USP(regs) ((regs)->sp) |
Harvey Harrison | 90d43d7 | 2008-01-30 13:33:16 +0100 | [diff] [blame] | 209 | |
Mike Frysinger | c46dd6b | 2011-05-26 16:25:43 -0700 | [diff] [blame] | 210 | #include <asm-generic/ptrace.h> |
Roland McGrath | 68bd0f4 | 2008-04-18 17:08:44 -0700 | [diff] [blame] | 211 | |
Masami Hiramatsu | b1cf540 | 2009-08-13 16:34:44 -0400 | [diff] [blame] | 212 | /* Query offset/name of register from its name/offset */ |
| 213 | extern int regs_query_register_offset(const char *name); |
| 214 | extern const char *regs_query_register_name(unsigned int offset); |
| 215 | #define MAX_REG_OFFSET (offsetof(struct pt_regs, ss)) |
| 216 | |
| 217 | /** |
| 218 | * regs_get_register() - get register value from its offset |
| 219 | * @regs: pt_regs from which register value is gotten. |
| 220 | * @offset: offset number of the register. |
| 221 | * |
Masami Hiramatsu | e859cf8 | 2009-11-30 19:02:22 -0500 | [diff] [blame] | 222 | * regs_get_register returns the value of a register. The @offset is the |
| 223 | * offset of the register in struct pt_regs address which specified by @regs. |
Masami Hiramatsu | b1cf540 | 2009-08-13 16:34:44 -0400 | [diff] [blame] | 224 | * If @offset is bigger than MAX_REG_OFFSET, this returns 0. |
| 225 | */ |
| 226 | static inline unsigned long regs_get_register(struct pt_regs *regs, |
| 227 | unsigned int offset) |
| 228 | { |
| 229 | if (unlikely(offset > MAX_REG_OFFSET)) |
| 230 | return 0; |
| 231 | return *(unsigned long *)((unsigned long)regs + offset); |
| 232 | } |
| 233 | |
| 234 | /** |
| 235 | * regs_within_kernel_stack() - check the address in the stack |
| 236 | * @regs: pt_regs which contains kernel stack pointer. |
| 237 | * @addr: address which is checked. |
| 238 | * |
Masami Hiramatsu | e859cf8 | 2009-11-30 19:02:22 -0500 | [diff] [blame] | 239 | * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). |
Masami Hiramatsu | b1cf540 | 2009-08-13 16:34:44 -0400 | [diff] [blame] | 240 | * If @addr is within the kernel stack, it returns true. If not, returns false. |
| 241 | */ |
| 242 | static inline int regs_within_kernel_stack(struct pt_regs *regs, |
| 243 | unsigned long addr) |
| 244 | { |
| 245 | return ((addr & ~(THREAD_SIZE - 1)) == |
| 246 | (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); |
| 247 | } |
| 248 | |
| 249 | /** |
| 250 | * regs_get_kernel_stack_nth() - get Nth entry of the stack |
| 251 | * @regs: pt_regs which contains kernel stack pointer. |
| 252 | * @n: stack entry number. |
| 253 | * |
| 254 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which |
Masami Hiramatsu | e859cf8 | 2009-11-30 19:02:22 -0500 | [diff] [blame] | 255 | * is specified by @regs. If the @n th entry is NOT in the kernel stack, |
Masami Hiramatsu | b1cf540 | 2009-08-13 16:34:44 -0400 | [diff] [blame] | 256 | * this returns 0. |
| 257 | */ |
| 258 | static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, |
| 259 | unsigned int n) |
| 260 | { |
| 261 | unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); |
| 262 | addr += n; |
| 263 | if (regs_within_kernel_stack(regs, (unsigned long)addr)) |
| 264 | return *addr; |
| 265 | else |
| 266 | return 0; |
| 267 | } |
| 268 | |
Roland McGrath | 7f23234 | 2008-01-30 13:30:48 +0100 | [diff] [blame] | 269 | #define arch_has_single_step() (1) |
Roland McGrath | 10faa81 | 2008-01-30 13:30:54 +0100 | [diff] [blame] | 270 | #ifdef CONFIG_X86_DEBUGCTLMSR |
| 271 | #define arch_has_block_step() (1) |
| 272 | #else |
| 273 | #define arch_has_block_step() (boot_cpu_data.x86 >= 6) |
| 274 | #endif |
| 275 | |
Oleg Nesterov | 7f38551 | 2009-12-15 16:47:20 -0800 | [diff] [blame] | 276 | #define ARCH_HAS_USER_SINGLE_STEP_INFO |
| 277 | |
Roland McGrath | efd1ca5 | 2008-01-30 13:30:46 +0100 | [diff] [blame] | 278 | struct user_desc; |
| 279 | extern int do_get_thread_area(struct task_struct *p, int idx, |
| 280 | struct user_desc __user *info); |
| 281 | extern int do_set_thread_area(struct task_struct *p, int idx, |
| 282 | struct user_desc __user *info, int can_allocate); |
| 283 | |
| 284 | #endif /* __KERNEL__ */ |
| 285 | |
Thomas Gleixner | 8fc37f2 | 2007-10-23 22:37:24 +0200 | [diff] [blame] | 286 | #endif /* !__ASSEMBLY__ */ |
| 287 | |
H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 288 | #endif /* _ASM_X86_PTRACE_H */ |