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Linux kernel mirror (for testing)
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linux
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
11struct 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
33struct 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
68struct cpuinfo_x86;
69struct task_struct;
70
71extern unsigned long profile_pc(struct pt_regs *regs);
72#define profile_pc profile_pc
73
74extern unsigned long
75convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
76extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
77 int error_code, int si_code);
78
79extern long syscall_trace_enter(struct pt_regs *);
80extern void syscall_trace_leave(struct pt_regs *);
81
82static 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 */
94static 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
103static 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
113static 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
123static 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
146extern unsigned long kernel_stack_pointer(struct pt_regs *regs);
147#else
148static 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 */
161extern int regs_query_register_offset(const char *name);
162extern 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 */
174static 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 */
199static 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 */
215static 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
235struct user_desc;
236extern int do_get_thread_area(struct task_struct *p, int idx,
237 struct user_desc __user *info);
238extern 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 */