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388 lines
10 KiB
388 lines
10 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_X86_PTRACE_H |
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#define _ASM_X86_PTRACE_H |
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#include <asm/segment.h> |
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#include <asm/page_types.h> |
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#include <uapi/asm/ptrace.h> |
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#ifndef __ASSEMBLY__ |
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#ifdef __i386__ |
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struct pt_regs { |
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/* |
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* NB: 32-bit x86 CPUs are inconsistent as what happens in the |
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* following cases (where %seg represents a segment register): |
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* |
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* - pushl %seg: some do a 16-bit write and leave the high |
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* bits alone |
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* - movl %seg, [mem]: some do a 16-bit write despite the movl |
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* - IDT entry: some (e.g. 486) will leave the high bits of CS |
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* and (if applicable) SS undefined. |
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* |
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* Fortunately, x86-32 doesn't read the high bits on POP or IRET, |
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* so we can just treat all of the segment registers as 16-bit |
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* values. |
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*/ |
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unsigned long bx; |
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unsigned long cx; |
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unsigned long dx; |
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unsigned long si; |
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unsigned long di; |
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unsigned long bp; |
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unsigned long ax; |
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unsigned short ds; |
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unsigned short __dsh; |
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unsigned short es; |
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unsigned short __esh; |
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unsigned short fs; |
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unsigned short __fsh; |
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/* On interrupt, gs and __gsh store the vector number. */ |
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unsigned short gs; |
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unsigned short __gsh; |
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/* On interrupt, this is the error code. */ |
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unsigned long orig_ax; |
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unsigned long ip; |
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unsigned short cs; |
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unsigned short __csh; |
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unsigned long flags; |
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unsigned long sp; |
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unsigned short ss; |
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unsigned short __ssh; |
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}; |
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#else /* __i386__ */ |
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struct pt_regs { |
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/* |
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* C ABI says these regs are callee-preserved. They aren't saved on kernel entry |
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* unless syscall needs a complete, fully filled "struct pt_regs". |
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*/ |
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unsigned long r15; |
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unsigned long r14; |
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unsigned long r13; |
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unsigned long r12; |
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unsigned long bp; |
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unsigned long bx; |
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/* These regs are callee-clobbered. Always saved on kernel entry. */ |
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unsigned long r11; |
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unsigned long r10; |
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unsigned long r9; |
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unsigned long r8; |
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unsigned long ax; |
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unsigned long cx; |
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unsigned long dx; |
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unsigned long si; |
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unsigned long di; |
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/* |
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* On syscall entry, this is syscall#. On CPU exception, this is error code. |
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* On hw interrupt, it's IRQ number: |
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*/ |
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unsigned long orig_ax; |
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/* Return frame for iretq */ |
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unsigned long ip; |
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unsigned long cs; |
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unsigned long flags; |
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unsigned long sp; |
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unsigned long ss; |
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/* top of stack page */ |
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}; |
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#endif /* !__i386__ */ |
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#ifdef CONFIG_PARAVIRT |
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#include <asm/paravirt_types.h> |
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#endif |
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#include <asm/proto.h> |
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struct cpuinfo_x86; |
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struct task_struct; |
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extern unsigned long profile_pc(struct pt_regs *regs); |
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extern unsigned long |
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convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs); |
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extern void send_sigtrap(struct pt_regs *regs, int error_code, int si_code); |
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static inline unsigned long regs_return_value(struct pt_regs *regs) |
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{ |
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return regs->ax; |
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} |
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static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc) |
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{ |
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regs->ax = rc; |
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} |
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/* |
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* user_mode(regs) determines whether a register set came from user |
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* mode. On x86_32, this is true if V8086 mode was enabled OR if the |
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* register set was from protected mode with RPL-3 CS value. This |
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* tricky test checks that with one comparison. |
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* |
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* On x86_64, vm86 mode is mercifully nonexistent, and we don't need |
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* the extra check. |
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*/ |
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static __always_inline int user_mode(struct pt_regs *regs) |
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{ |
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#ifdef CONFIG_X86_32 |
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return ((regs->cs & SEGMENT_RPL_MASK) | (regs->flags & X86_VM_MASK)) >= USER_RPL; |
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#else |
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return !!(regs->cs & 3); |
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#endif |
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} |
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static inline int v8086_mode(struct pt_regs *regs) |
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{ |
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#ifdef CONFIG_X86_32 |
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return (regs->flags & X86_VM_MASK); |
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#else |
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return 0; /* No V86 mode support in long mode */ |
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#endif |
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} |
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static inline bool user_64bit_mode(struct pt_regs *regs) |
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{ |
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#ifdef CONFIG_X86_64 |
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#ifndef CONFIG_PARAVIRT_XXL |
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/* |
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* On non-paravirt systems, this is the only long mode CPL 3 |
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* selector. We do not allow long mode selectors in the LDT. |
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*/ |
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return regs->cs == __USER_CS; |
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#else |
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/* Headers are too twisted for this to go in paravirt.h. */ |
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return regs->cs == __USER_CS || regs->cs == pv_info.extra_user_64bit_cs; |
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#endif |
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#else /* !CONFIG_X86_64 */ |
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return false; |
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#endif |
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} |
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/* |
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* Determine whether the register set came from any context that is running in |
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* 64-bit mode. |
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*/ |
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static inline bool any_64bit_mode(struct pt_regs *regs) |
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{ |
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#ifdef CONFIG_X86_64 |
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return !user_mode(regs) || user_64bit_mode(regs); |
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#else |
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return false; |
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#endif |
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} |
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#ifdef CONFIG_X86_64 |
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#define current_user_stack_pointer() current_pt_regs()->sp |
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#define compat_user_stack_pointer() current_pt_regs()->sp |
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static inline bool ip_within_syscall_gap(struct pt_regs *regs) |
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{ |
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bool ret = (regs->ip >= (unsigned long)entry_SYSCALL_64 && |
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regs->ip < (unsigned long)entry_SYSCALL_64_safe_stack); |
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#ifdef CONFIG_IA32_EMULATION |
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ret = ret || (regs->ip >= (unsigned long)entry_SYSCALL_compat && |
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regs->ip < (unsigned long)entry_SYSCALL_compat_safe_stack); |
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#endif |
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return ret; |
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} |
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#endif |
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static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) |
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{ |
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return regs->sp; |
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} |
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static inline unsigned long instruction_pointer(struct pt_regs *regs) |
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{ |
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return regs->ip; |
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} |
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static inline void instruction_pointer_set(struct pt_regs *regs, |
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unsigned long val) |
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{ |
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regs->ip = val; |
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} |
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static inline unsigned long frame_pointer(struct pt_regs *regs) |
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{ |
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return regs->bp; |
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} |
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static inline unsigned long user_stack_pointer(struct pt_regs *regs) |
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{ |
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return regs->sp; |
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} |
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static inline void user_stack_pointer_set(struct pt_regs *regs, |
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unsigned long val) |
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{ |
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regs->sp = val; |
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} |
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static __always_inline bool regs_irqs_disabled(struct pt_regs *regs) |
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{ |
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return !(regs->flags & X86_EFLAGS_IF); |
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} |
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/* Query offset/name of register from its name/offset */ |
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extern int regs_query_register_offset(const char *name); |
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extern const char *regs_query_register_name(unsigned int offset); |
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#define MAX_REG_OFFSET (offsetof(struct pt_regs, ss)) |
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/** |
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* regs_get_register() - get register value from its offset |
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* @regs: pt_regs from which register value is gotten. |
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* @offset: offset number of the register. |
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* |
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* regs_get_register returns the value of a register. The @offset is the |
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* offset of the register in struct pt_regs address which specified by @regs. |
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* If @offset is bigger than MAX_REG_OFFSET, this returns 0. |
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*/ |
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static inline unsigned long regs_get_register(struct pt_regs *regs, |
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unsigned int offset) |
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{ |
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if (unlikely(offset > MAX_REG_OFFSET)) |
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return 0; |
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#ifdef CONFIG_X86_32 |
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/* The selector fields are 16-bit. */ |
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if (offset == offsetof(struct pt_regs, cs) || |
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offset == offsetof(struct pt_regs, ss) || |
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offset == offsetof(struct pt_regs, ds) || |
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offset == offsetof(struct pt_regs, es) || |
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offset == offsetof(struct pt_regs, fs) || |
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offset == offsetof(struct pt_regs, gs)) { |
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return *(u16 *)((unsigned long)regs + offset); |
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} |
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#endif |
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return *(unsigned long *)((unsigned long)regs + offset); |
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} |
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/** |
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* regs_within_kernel_stack() - check the address in the stack |
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* @regs: pt_regs which contains kernel stack pointer. |
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* @addr: address which is checked. |
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* |
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* regs_within_kernel_stack() checks @addr is within the kernel stack page(s). |
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* If @addr is within the kernel stack, it returns true. If not, returns false. |
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*/ |
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static inline int regs_within_kernel_stack(struct pt_regs *regs, |
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unsigned long addr) |
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{ |
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return ((addr & ~(THREAD_SIZE - 1)) == (regs->sp & ~(THREAD_SIZE - 1))); |
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} |
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/** |
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* regs_get_kernel_stack_nth_addr() - get the address of the Nth entry on stack |
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* @regs: pt_regs which contains kernel stack pointer. |
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* @n: stack entry number. |
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* |
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* regs_get_kernel_stack_nth() returns the address of the @n th entry of the |
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* kernel stack which is specified by @regs. If the @n th entry is NOT in |
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* the kernel stack, this returns NULL. |
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*/ |
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static inline unsigned long *regs_get_kernel_stack_nth_addr(struct pt_regs *regs, unsigned int n) |
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{ |
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unsigned long *addr = (unsigned long *)regs->sp; |
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addr += n; |
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if (regs_within_kernel_stack(regs, (unsigned long)addr)) |
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return addr; |
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else |
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return NULL; |
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} |
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/* To avoid include hell, we can't include uaccess.h */ |
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extern long copy_from_kernel_nofault(void *dst, const void *src, size_t size); |
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/** |
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* regs_get_kernel_stack_nth() - get Nth entry of the stack |
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* @regs: pt_regs which contains kernel stack pointer. |
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* @n: stack entry number. |
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* |
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* regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which |
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* is specified by @regs. If the @n th entry is NOT in the kernel stack |
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* this returns 0. |
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*/ |
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static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, |
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unsigned int n) |
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{ |
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unsigned long *addr; |
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unsigned long val; |
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long ret; |
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addr = regs_get_kernel_stack_nth_addr(regs, n); |
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if (addr) { |
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ret = copy_from_kernel_nofault(&val, addr, sizeof(val)); |
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if (!ret) |
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return val; |
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} |
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return 0; |
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} |
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/** |
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* regs_get_kernel_argument() - get Nth function argument in kernel |
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* @regs: pt_regs of that context |
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* @n: function argument number (start from 0) |
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* |
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* regs_get_argument() returns @n th argument of the function call. |
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* Note that this chooses most probably assignment, in some case |
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* it can be incorrect. |
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* This is expected to be called from kprobes or ftrace with regs |
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* where the top of stack is the return address. |
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*/ |
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static inline unsigned long regs_get_kernel_argument(struct pt_regs *regs, |
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unsigned int n) |
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{ |
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static const unsigned int argument_offs[] = { |
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#ifdef __i386__ |
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offsetof(struct pt_regs, ax), |
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offsetof(struct pt_regs, dx), |
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offsetof(struct pt_regs, cx), |
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#define NR_REG_ARGUMENTS 3 |
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#else |
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offsetof(struct pt_regs, di), |
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offsetof(struct pt_regs, si), |
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offsetof(struct pt_regs, dx), |
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offsetof(struct pt_regs, cx), |
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offsetof(struct pt_regs, r8), |
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offsetof(struct pt_regs, r9), |
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#define NR_REG_ARGUMENTS 6 |
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#endif |
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}; |
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if (n >= NR_REG_ARGUMENTS) { |
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n -= NR_REG_ARGUMENTS - 1; |
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return regs_get_kernel_stack_nth(regs, n); |
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} else |
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return regs_get_register(regs, argument_offs[n]); |
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} |
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#define arch_has_single_step() (1) |
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#ifdef CONFIG_X86_DEBUGCTLMSR |
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#define arch_has_block_step() (1) |
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#else |
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#define arch_has_block_step() (boot_cpu_data.x86 >= 6) |
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#endif |
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#define ARCH_HAS_USER_SINGLE_STEP_REPORT |
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struct user_desc; |
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extern int do_get_thread_area(struct task_struct *p, int idx, |
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struct user_desc __user *info); |
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extern int do_set_thread_area(struct task_struct *p, int idx, |
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struct user_desc __user *info, int can_allocate); |
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#ifdef CONFIG_X86_64 |
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# define do_set_thread_area_64(p, s, t) do_arch_prctl_64(p, s, t) |
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#else |
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# define do_set_thread_area_64(p, s, t) (0) |
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#endif |
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#endif /* !__ASSEMBLY__ */ |
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#endif /* _ASM_X86_PTRACE_H */
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