1 #ifndef _ASM_X86_PTRACE_H
2 #define _ASM_X86_PTRACE_H
4 #include <linux/compiler.h> /* For __user */
5 #include <asm/ptrace-abi.h>
6 #include <asm/processor-flags.h>
9 #include <asm/ds.h> /* the DS BTS struct is used for ptrace too */
10 #include <asm/segment.h>
16 /* this struct defines the way the registers are stored on the
17 stack during a system call. */
41 #else /* __KERNEL__ */
55 unsigned long orig_ax;
63 #endif /* __KERNEL__ */
76 /* arguments: non interrupts/non tracing syscalls only save upto here*/
86 unsigned long orig_rax;
87 /* end of arguments */
88 /* cpu exception frame or undefined */
94 /* top of stack page */
97 #else /* __KERNEL__ */
106 /* arguments: non interrupts/non tracing syscalls only save upto here*/
116 unsigned long orig_ax;
117 /* end of arguments */
118 /* cpu exception frame or undefined */
124 /* top of stack page */
127 #endif /* __KERNEL__ */
128 #endif /* !__i386__ */
132 /* the DS BTS struct is used for ptrace as well */
137 extern void ptrace_bts_take_timestamp(struct task_struct *, enum bts_qualifier);
139 extern unsigned long profile_pc(struct pt_regs *regs);
142 convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs);
145 extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
148 void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
151 static inline unsigned long regs_return_value(struct pt_regs *regs)
157 * user_mode_vm(regs) determines whether a register set came from user mode.
158 * This is true if V8086 mode was enabled OR if the register set was from
159 * protected mode with RPL-3 CS value. This tricky test checks that with
160 * one comparison. Many places in the kernel can bypass this full check
161 * if they have already ruled out V8086 mode, so user_mode(regs) can be used.
163 static inline int user_mode(struct pt_regs *regs)
166 return (regs->cs & SEGMENT_RPL_MASK) == USER_RPL;
168 return !!(regs->cs & 3);
172 static inline int user_mode_vm(struct pt_regs *regs)
175 return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >=
178 return user_mode(regs);
182 static inline int v8086_mode(struct pt_regs *regs)
185 return (regs->flags & X86_VM_MASK);
187 return 0; /* No V86 mode support in long mode */
192 * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
193 * when it traps. So regs will be the current sp.
195 * This is valid only for kernel mode traps.
197 static inline unsigned long kernel_trap_sp(struct pt_regs *regs)
200 return (unsigned long)regs;
206 static inline unsigned long instruction_pointer(struct pt_regs *regs)
211 static inline unsigned long frame_pointer(struct pt_regs *regs)
217 * These are defined as per linux/ptrace.h, which see.
219 #define arch_has_single_step() (1)
220 extern void user_enable_single_step(struct task_struct *);
221 extern void user_disable_single_step(struct task_struct *);
223 extern void user_enable_block_step(struct task_struct *);
224 #ifdef CONFIG_X86_DEBUGCTLMSR
225 #define arch_has_block_step() (1)
227 #define arch_has_block_step() (boot_cpu_data.x86 >= 6)
231 extern int do_get_thread_area(struct task_struct *p, int idx,
232 struct user_desc __user *info);
233 extern int do_set_thread_area(struct task_struct *p, int idx,
234 struct user_desc __user *info, int can_allocate);
236 #define __ARCH_WANT_COMPAT_SYS_PTRACE
238 #endif /* __KERNEL__ */
240 #endif /* !__ASSEMBLY__ */