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H. Peter Anvin1965aae2008-10-22 22:26:29 -07001#ifndef _ASM_X86_PTRACE_H
2#define _ASM_X86_PTRACE_H
Thomas Gleixner8fc37f22007-10-23 22:37:24 +02003
Vegard Nossum6330a302008-05-28 09:46:19 +02004#include <asm/segment.h>
Masami Hiramatsub1cf5402009-08-13 16:34:44 -04005#include <asm/page_types.h>
David Howellsaf170c52012-12-14 22:37:13 +00006#include <uapi/asm/ptrace.h>
Markus Metzgereee3af42008-01-30 13:31:09 +01007
Thomas Gleixner8fc37f22007-10-23 22:37:24 +02008#ifndef __ASSEMBLY__
Thomas Gleixner8fc37f22007-10-23 22:37:24 +02009#ifdef __i386__
H. Peter Anvin65ea5b02008-01-30 13:30:56 +010010
11struct pt_regs {
Harvey Harrison92bc2052008-02-08 12:09:56 -080012 unsigned long bx;
13 unsigned long cx;
14 unsigned long dx;
15 unsigned long si;
16 unsigned long di;
17 unsigned long bp;
Harvey Harrison9902a702008-02-08 12:09:57 -080018 unsigned long ax;
Harvey Harrison92bc2052008-02-08 12:09:56 -080019 unsigned long ds;
20 unsigned long es;
21 unsigned long fs;
Tejun Heoccbeed32009-02-09 22:17:40 +090022 unsigned long gs;
Harvey Harrison9902a702008-02-08 12:09:57 -080023 unsigned long orig_ax;
Harvey Harrison92bc2052008-02-08 12:09:56 -080024 unsigned long ip;
25 unsigned long cs;
26 unsigned long flags;
27 unsigned long sp;
28 unsigned long ss;
H. Peter Anvin65ea5b02008-01-30 13:30:56 +010029};
Thomas Gleixner8fc37f22007-10-23 22:37:24 +020030
Thomas Gleixner8fc37f22007-10-23 22:37:24 +020031#else /* __i386__ */
32
H. Peter Anvin65ea5b02008-01-30 13:30:56 +010033struct 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;
Lucas De Marchi0d2eb442011-03-17 16:24:16 -030040/* arguments: non interrupts/non tracing syscalls only save up to here*/
H. Peter Anvin65ea5b02008-01-30 13:30:56 +010041 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};
Thomas Gleixner8fc37f22007-10-23 22:37:24 +020060
Thomas Gleixner8fc37f22007-10-23 22:37:24 +020061#endif /* !__i386__ */
Roland McGrathefd1ca52008-01-30 13:30:46 +010062
Andy Lutomirski318f5a22011-08-03 09:31:53 -040063#ifdef CONFIG_PARAVIRT
64#include <asm/paravirt_types.h>
65#endif
Harvey Harrisondbe35332008-01-30 13:33:16 +010066
Markus Metzger93fa7632008-04-08 11:01:58 +020067struct cpuinfo_x86;
Harvey Harrisondbe35332008-01-30 13:33:16 +010068struct task_struct;
69
Harvey Harrisondbe35332008-01-30 13:33:16 +010070extern unsigned long profile_pc(struct pt_regs *regs);
Mike Frysingerc46dd6b2011-05-26 16:25:43 -070071#define profile_pc profile_pc
Harvey Harrisondbe35332008-01-30 13:33:16 +010072
73extern unsigned long
74convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
Joe Perches72f74fa22008-03-23 01:03:17 -070075extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
Srinivasa Dsda654b72008-09-23 15:23:52 +053076 int error_code, int si_code);
Hiroshi Shimamoto72fa50f2008-09-05 16:27:11 -070077
Jaswinder Singhc1686ae2008-07-21 22:35:38 +053078extern long syscall_trace_enter(struct pt_regs *);
79extern void syscall_trace_leave(struct pt_regs *);
80
Harvey Harrison9902a702008-02-08 12:09:57 -080081static inline unsigned long regs_return_value(struct pt_regs *regs)
82{
83 return regs->ax;
84}
Harvey Harrisondbe35332008-01-30 13:33:16 +010085
Roland McGrath7f232342008-01-30 13:30:48 +010086/*
Harvey Harrison90d43d72008-01-30 13:33:16 +010087 * 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 */
93static 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
102static inline int user_mode_vm(struct pt_regs *regs)
103{
104#ifdef CONFIG_X86_32
gorcunov@gmail.com6b6891f2008-03-28 17:56:57 +0300105 return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
Joe Perches72f74fa22008-03-23 01:03:17 -0700106 USER_RPL;
Harvey Harrison90d43d72008-01-30 13:33:16 +0100107#else
108 return user_mode(regs);
109#endif
110}
111
112static inline int v8086_mode(struct pt_regs *regs)
113{
114#ifdef CONFIG_X86_32
gorcunov@gmail.com6b6891f2008-03-28 17:56:57 +0300115 return (regs->flags & X86_VM_MASK);
Harvey Harrison90d43d72008-01-30 13:33:16 +0100116#else
117 return 0; /* No V86 mode support in long mode */
118#endif
119}
120
Andy Lutomirski318f5a22011-08-03 09:31:53 -0400121#ifdef CONFIG_X86_64
122static 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}
Al Viro9b064fc2012-12-14 13:49:35 -0500135
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))
Andy Lutomirski318f5a22011-08-03 09:31:53 -0400142#endif
143
Robert Richter10226232012-09-03 20:54:48 +0200144#ifdef CONFIG_X86_32
145extern unsigned long kernel_stack_pointer(struct pt_regs *regs);
146#else
Masami Hiramatsu7b6c6c72009-05-11 17:03:00 -0400147static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
Harvey Harrison90d43d72008-01-30 13:33:16 +0100148{
Harvey Harrison90d43d72008-01-30 13:33:16 +0100149 return regs->sp;
Harvey Harrison90d43d72008-01-30 13:33:16 +0100150}
Robert Richter10226232012-09-03 20:54:48 +0200151#endif
Harvey Harrison90d43d72008-01-30 13:33:16 +0100152
Mike Frysingerc46dd6b2011-05-26 16:25:43 -0700153#define GET_IP(regs) ((regs)->ip)
154#define GET_FP(regs) ((regs)->bp)
155#define GET_USP(regs) ((regs)->sp)
Harvey Harrison90d43d72008-01-30 13:33:16 +0100156
Mike Frysingerc46dd6b2011-05-26 16:25:43 -0700157#include <asm-generic/ptrace.h>
Roland McGrath68bd0f42008-04-18 17:08:44 -0700158
Masami Hiramatsub1cf5402009-08-13 16:34:44 -0400159/* Query offset/name of register from its name/offset */
160extern int regs_query_register_offset(const char *name);
161extern 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 *
Masami Hiramatsue859cf82009-11-30 19:02:22 -0500169 * 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.
Masami Hiramatsub1cf5402009-08-13 16:34:44 -0400171 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
172 */
173static 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;
Steven Rostedt6c8d8b32012-07-13 15:44:14 -0400178#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
Masami Hiramatsub1cf5402009-08-13 16:34:44 -0400187 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 *
Masami Hiramatsue859cf82009-11-30 19:02:22 -0500195 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
Masami Hiramatsub1cf5402009-08-13 16:34:44 -0400196 * If @addr is within the kernel stack, it returns true. If not, returns false.
197 */
198static 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
Masami Hiramatsue859cf82009-11-30 19:02:22 -0500211 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
Masami Hiramatsub1cf5402009-08-13 16:34:44 -0400212 * this returns 0.
213 */
214static 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
Roland McGrath7f232342008-01-30 13:30:48 +0100225#define arch_has_single_step() (1)
Roland McGrath10faa812008-01-30 13:30:54 +0100226#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
Oleg Nesterov7f385512009-12-15 16:47:20 -0800232#define ARCH_HAS_USER_SINGLE_STEP_INFO
233
Roland McGrathefd1ca52008-01-30 13:30:46 +0100234struct user_desc;
235extern int do_get_thread_area(struct task_struct *p, int idx,
236 struct user_desc __user *info);
237extern int do_set_thread_area(struct task_struct *p, int idx,
238 struct user_desc __user *info, int can_allocate);
239
Thomas Gleixner8fc37f22007-10-23 22:37:24 +0200240#endif /* !__ASSEMBLY__ */
H. Peter Anvin1965aae2008-10-22 22:26:29 -0700241#endif /* _ASM_X86_PTRACE_H */