1 #ifndef _ASM_X86_PTRACE_H
2 #define _ASM_X86_PTRACE_H
4 #include <asm/segment.h>
5 #include <asm/page_types.h>
6 #include <uapi/asm/ptrace.h>
23 unsigned long orig_ax;
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".
44 /* These regs are callee-clobbered. Always saved on kernel entry. */
55 * On syscall entry, this is syscall#. On CPU exception, this is error code.
56 * On hw interrupt, it's IRQ number:
58 unsigned long orig_ax;
59 /* Return frame for iretq */
65 /* top of stack page */
68 #endif /* !__i386__ */
70 #ifdef CONFIG_PARAVIRT
71 #include <asm/paravirt_types.h>
77 extern unsigned long profile_pc(struct pt_regs *regs);
78 #define profile_pc profile_pc
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);
86 static inline unsigned long regs_return_value(struct pt_regs *regs)
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.
97 * On x86_64, vm86 mode is mercifully nonexistent, and we don't need
100 static inline int user_mode(struct pt_regs *regs)
103 return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >= USER_RPL;
105 return !!(regs->cs & 3);
109 static inline int v8086_mode(struct pt_regs *regs)
112 return (regs->flags & X86_VM_MASK);
114 return 0; /* No V86 mode support in long mode */
119 static inline bool user_64bit_mode(struct pt_regs *regs)
121 #ifndef CONFIG_PARAVIRT
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.
126 return regs->cs == __USER_CS;
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;
133 #define current_user_stack_pointer() current_pt_regs()->sp
134 #define compat_user_stack_pointer() current_pt_regs()->sp
138 extern unsigned long kernel_stack_pointer(struct pt_regs *regs);
140 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
146 #define GET_IP(regs) ((regs)->ip)
147 #define GET_FP(regs) ((regs)->bp)
148 #define GET_USP(regs) ((regs)->sp)
150 #include <asm-generic/ptrace.h>
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))
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.
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.
166 static inline unsigned long regs_get_register(struct pt_regs *regs,
169 if (unlikely(offset > MAX_REG_OFFSET))
173 * Traps from the kernel do not save sp and ss.
174 * Use the helper function to retrieve sp.
176 if (offset == offsetof(struct pt_regs, sp) &&
177 regs->cs == __KERNEL_CS)
178 return kernel_stack_pointer(regs);
180 return *(unsigned long *)((unsigned long)regs + offset);
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.
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.
191 static inline int regs_within_kernel_stack(struct pt_regs *regs,
194 return ((addr & ~(THREAD_SIZE - 1)) ==
195 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
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.
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,
207 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
210 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
212 if (regs_within_kernel_stack(regs, (unsigned long)addr))
218 #define arch_has_single_step() (1)
219 #ifdef CONFIG_X86_DEBUGCTLMSR
220 #define arch_has_block_step() (1)
222 #define arch_has_block_step() (boot_cpu_data.x86 >= 6)
225 #define ARCH_HAS_USER_SINGLE_STEP_INFO
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.
235 * So force IRET path after a ptrace stop.
237 #define arch_ptrace_stop_needed(code, info) \
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);
249 #endif /* !__ASSEMBLY__ */
250 #endif /* _ASM_X86_PTRACE_H */