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510 lines
17 KiB
510 lines
17 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/****************************************************************************** |
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* x86_emulate.h |
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* |
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* Generic x86 (32-bit and 64-bit) instruction decoder and emulator. |
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* |
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* Copyright (c) 2005 Keir Fraser |
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* |
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* From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4 |
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*/ |
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#ifndef _ASM_X86_KVM_X86_EMULATE_H |
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#define _ASM_X86_KVM_X86_EMULATE_H |
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#include <asm/desc_defs.h> |
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struct x86_emulate_ctxt; |
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enum x86_intercept; |
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enum x86_intercept_stage; |
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struct x86_exception { |
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u8 vector; |
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bool error_code_valid; |
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u16 error_code; |
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bool nested_page_fault; |
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u64 address; /* cr2 or nested page fault gpa */ |
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u8 async_page_fault; |
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}; |
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/* |
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* This struct is used to carry enough information from the instruction |
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* decoder to main KVM so that a decision can be made whether the |
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* instruction needs to be intercepted or not. |
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*/ |
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struct x86_instruction_info { |
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u8 intercept; /* which intercept */ |
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u8 rep_prefix; /* rep prefix? */ |
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u8 modrm_mod; /* mod part of modrm */ |
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u8 modrm_reg; /* index of register used */ |
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u8 modrm_rm; /* rm part of modrm */ |
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u64 src_val; /* value of source operand */ |
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u64 dst_val; /* value of destination operand */ |
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u8 src_bytes; /* size of source operand */ |
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u8 dst_bytes; /* size of destination operand */ |
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u8 ad_bytes; /* size of src/dst address */ |
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u64 next_rip; /* rip following the instruction */ |
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}; |
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/* |
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* x86_emulate_ops: |
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* |
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* These operations represent the instruction emulator's interface to memory. |
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* There are two categories of operation: those that act on ordinary memory |
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* regions (*_std), and those that act on memory regions known to require |
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* special treatment or emulation (*_emulated). |
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* |
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* The emulator assumes that an instruction accesses only one 'emulated memory' |
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* location, that this location is the given linear faulting address (cr2), and |
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* that this is one of the instruction's data operands. Instruction fetches and |
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* stack operations are assumed never to access emulated memory. The emulator |
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* automatically deduces which operand of a string-move operation is accessing |
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* emulated memory, and assumes that the other operand accesses normal memory. |
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* |
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* NOTES: |
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* 1. The emulator isn't very smart about emulated vs. standard memory. |
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* 'Emulated memory' access addresses should be checked for sanity. |
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* 'Normal memory' accesses may fault, and the caller must arrange to |
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* detect and handle reentrancy into the emulator via recursive faults. |
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* Accesses may be unaligned and may cross page boundaries. |
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* 2. If the access fails (cannot emulate, or a standard access faults) then |
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* it is up to the memop to propagate the fault to the guest VM via |
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* some out-of-band mechanism, unknown to the emulator. The memop signals |
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* failure by returning X86EMUL_PROPAGATE_FAULT to the emulator, which will |
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* then immediately bail. |
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* 3. Valid access sizes are 1, 2, 4 and 8 bytes. On x86/32 systems only |
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* cmpxchg8b_emulated need support 8-byte accesses. |
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* 4. The emulator cannot handle 64-bit mode emulation on an x86/32 system. |
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*/ |
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/* Access completed successfully: continue emulation as normal. */ |
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#define X86EMUL_CONTINUE 0 |
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/* Access is unhandleable: bail from emulation and return error to caller. */ |
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#define X86EMUL_UNHANDLEABLE 1 |
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/* Terminate emulation but return success to the caller. */ |
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#define X86EMUL_PROPAGATE_FAULT 2 /* propagate a generated fault to guest */ |
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#define X86EMUL_RETRY_INSTR 3 /* retry the instruction for some reason */ |
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#define X86EMUL_CMPXCHG_FAILED 4 /* cmpxchg did not see expected value */ |
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#define X86EMUL_IO_NEEDED 5 /* IO is needed to complete emulation */ |
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#define X86EMUL_INTERCEPTED 6 /* Intercepted by nested VMCB/VMCS */ |
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struct x86_emulate_ops { |
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/* |
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* read_gpr: read a general purpose register (rax - r15) |
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* |
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* @reg: gpr number. |
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*/ |
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ulong (*read_gpr)(struct x86_emulate_ctxt *ctxt, unsigned reg); |
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/* |
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* write_gpr: write a general purpose register (rax - r15) |
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* |
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* @reg: gpr number. |
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* @val: value to write. |
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*/ |
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void (*write_gpr)(struct x86_emulate_ctxt *ctxt, unsigned reg, ulong val); |
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/* |
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* read_std: Read bytes of standard (non-emulated/special) memory. |
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* Used for descriptor reading. |
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* @addr: [IN ] Linear address from which to read. |
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* @val: [OUT] Value read from memory, zero-extended to 'u_long'. |
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* @bytes: [IN ] Number of bytes to read from memory. |
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* @system:[IN ] Whether the access is forced to be at CPL0. |
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*/ |
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int (*read_std)(struct x86_emulate_ctxt *ctxt, |
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unsigned long addr, void *val, |
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unsigned int bytes, |
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struct x86_exception *fault, bool system); |
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/* |
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* read_phys: Read bytes of standard (non-emulated/special) memory. |
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* Used for descriptor reading. |
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* @addr: [IN ] Physical address from which to read. |
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* @val: [OUT] Value read from memory. |
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* @bytes: [IN ] Number of bytes to read from memory. |
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*/ |
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int (*read_phys)(struct x86_emulate_ctxt *ctxt, unsigned long addr, |
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void *val, unsigned int bytes); |
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/* |
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* write_std: Write bytes of standard (non-emulated/special) memory. |
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* Used for descriptor writing. |
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* @addr: [IN ] Linear address to which to write. |
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* @val: [OUT] Value write to memory, zero-extended to 'u_long'. |
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* @bytes: [IN ] Number of bytes to write to memory. |
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* @system:[IN ] Whether the access is forced to be at CPL0. |
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*/ |
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int (*write_std)(struct x86_emulate_ctxt *ctxt, |
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unsigned long addr, void *val, unsigned int bytes, |
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struct x86_exception *fault, bool system); |
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/* |
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* fetch: Read bytes of standard (non-emulated/special) memory. |
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* Used for instruction fetch. |
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* @addr: [IN ] Linear address from which to read. |
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* @val: [OUT] Value read from memory, zero-extended to 'u_long'. |
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* @bytes: [IN ] Number of bytes to read from memory. |
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*/ |
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int (*fetch)(struct x86_emulate_ctxt *ctxt, |
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unsigned long addr, void *val, unsigned int bytes, |
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struct x86_exception *fault); |
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/* |
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* read_emulated: Read bytes from emulated/special memory area. |
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* @addr: [IN ] Linear address from which to read. |
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* @val: [OUT] Value read from memory, zero-extended to 'u_long'. |
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* @bytes: [IN ] Number of bytes to read from memory. |
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*/ |
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int (*read_emulated)(struct x86_emulate_ctxt *ctxt, |
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unsigned long addr, void *val, unsigned int bytes, |
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struct x86_exception *fault); |
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/* |
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* write_emulated: Write bytes to emulated/special memory area. |
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* @addr: [IN ] Linear address to which to write. |
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* @val: [IN ] Value to write to memory (low-order bytes used as |
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* required). |
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* @bytes: [IN ] Number of bytes to write to memory. |
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*/ |
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int (*write_emulated)(struct x86_emulate_ctxt *ctxt, |
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unsigned long addr, const void *val, |
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unsigned int bytes, |
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struct x86_exception *fault); |
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/* |
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* cmpxchg_emulated: Emulate an atomic (LOCKed) CMPXCHG operation on an |
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* emulated/special memory area. |
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* @addr: [IN ] Linear address to access. |
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* @old: [IN ] Value expected to be current at @addr. |
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* @new: [IN ] Value to write to @addr. |
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* @bytes: [IN ] Number of bytes to access using CMPXCHG. |
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*/ |
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int (*cmpxchg_emulated)(struct x86_emulate_ctxt *ctxt, |
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unsigned long addr, |
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const void *old, |
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const void *new, |
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unsigned int bytes, |
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struct x86_exception *fault); |
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void (*invlpg)(struct x86_emulate_ctxt *ctxt, ulong addr); |
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int (*pio_in_emulated)(struct x86_emulate_ctxt *ctxt, |
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int size, unsigned short port, void *val, |
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unsigned int count); |
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int (*pio_out_emulated)(struct x86_emulate_ctxt *ctxt, |
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int size, unsigned short port, const void *val, |
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unsigned int count); |
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bool (*get_segment)(struct x86_emulate_ctxt *ctxt, u16 *selector, |
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struct desc_struct *desc, u32 *base3, int seg); |
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void (*set_segment)(struct x86_emulate_ctxt *ctxt, u16 selector, |
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struct desc_struct *desc, u32 base3, int seg); |
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unsigned long (*get_cached_segment_base)(struct x86_emulate_ctxt *ctxt, |
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int seg); |
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void (*get_gdt)(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt); |
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void (*get_idt)(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt); |
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void (*set_gdt)(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt); |
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void (*set_idt)(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt); |
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ulong (*get_cr)(struct x86_emulate_ctxt *ctxt, int cr); |
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int (*set_cr)(struct x86_emulate_ctxt *ctxt, int cr, ulong val); |
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int (*cpl)(struct x86_emulate_ctxt *ctxt); |
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void (*get_dr)(struct x86_emulate_ctxt *ctxt, int dr, ulong *dest); |
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int (*set_dr)(struct x86_emulate_ctxt *ctxt, int dr, ulong value); |
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u64 (*get_smbase)(struct x86_emulate_ctxt *ctxt); |
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void (*set_smbase)(struct x86_emulate_ctxt *ctxt, u64 smbase); |
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int (*set_msr)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 data); |
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int (*get_msr)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 *pdata); |
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int (*check_pmc)(struct x86_emulate_ctxt *ctxt, u32 pmc); |
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int (*read_pmc)(struct x86_emulate_ctxt *ctxt, u32 pmc, u64 *pdata); |
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void (*halt)(struct x86_emulate_ctxt *ctxt); |
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void (*wbinvd)(struct x86_emulate_ctxt *ctxt); |
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int (*fix_hypercall)(struct x86_emulate_ctxt *ctxt); |
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int (*intercept)(struct x86_emulate_ctxt *ctxt, |
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struct x86_instruction_info *info, |
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enum x86_intercept_stage stage); |
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bool (*get_cpuid)(struct x86_emulate_ctxt *ctxt, u32 *eax, u32 *ebx, |
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u32 *ecx, u32 *edx, bool exact_only); |
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bool (*guest_has_long_mode)(struct x86_emulate_ctxt *ctxt); |
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bool (*guest_has_movbe)(struct x86_emulate_ctxt *ctxt); |
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bool (*guest_has_fxsr)(struct x86_emulate_ctxt *ctxt); |
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void (*set_nmi_mask)(struct x86_emulate_ctxt *ctxt, bool masked); |
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unsigned (*get_hflags)(struct x86_emulate_ctxt *ctxt); |
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void (*set_hflags)(struct x86_emulate_ctxt *ctxt, unsigned hflags); |
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int (*pre_leave_smm)(struct x86_emulate_ctxt *ctxt, |
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const char *smstate); |
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void (*post_leave_smm)(struct x86_emulate_ctxt *ctxt); |
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int (*set_xcr)(struct x86_emulate_ctxt *ctxt, u32 index, u64 xcr); |
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}; |
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typedef u32 __attribute__((vector_size(16))) sse128_t; |
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/* Type, address-of, and value of an instruction's operand. */ |
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struct operand { |
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enum { OP_REG, OP_MEM, OP_MEM_STR, OP_IMM, OP_XMM, OP_MM, OP_NONE } type; |
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unsigned int bytes; |
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unsigned int count; |
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union { |
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unsigned long orig_val; |
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u64 orig_val64; |
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}; |
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union { |
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unsigned long *reg; |
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struct segmented_address { |
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ulong ea; |
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unsigned seg; |
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} mem; |
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unsigned xmm; |
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unsigned mm; |
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} addr; |
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union { |
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unsigned long val; |
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u64 val64; |
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char valptr[sizeof(sse128_t)]; |
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sse128_t vec_val; |
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u64 mm_val; |
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void *data; |
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}; |
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}; |
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struct fetch_cache { |
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u8 data[15]; |
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u8 *ptr; |
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u8 *end; |
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}; |
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struct read_cache { |
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u8 data[1024]; |
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unsigned long pos; |
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unsigned long end; |
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}; |
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/* Execution mode, passed to the emulator. */ |
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enum x86emul_mode { |
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X86EMUL_MODE_REAL, /* Real mode. */ |
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X86EMUL_MODE_VM86, /* Virtual 8086 mode. */ |
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X86EMUL_MODE_PROT16, /* 16-bit protected mode. */ |
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X86EMUL_MODE_PROT32, /* 32-bit protected mode. */ |
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X86EMUL_MODE_PROT64, /* 64-bit (long) mode. */ |
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}; |
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/* These match some of the HF_* flags defined in kvm_host.h */ |
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#define X86EMUL_GUEST_MASK (1 << 5) /* VCPU is in guest-mode */ |
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#define X86EMUL_SMM_MASK (1 << 6) |
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#define X86EMUL_SMM_INSIDE_NMI_MASK (1 << 7) |
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/* |
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* fastop functions are declared as taking a never-defined fastop parameter, |
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* so they can't be called from C directly. |
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*/ |
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struct fastop; |
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typedef void (*fastop_t)(struct fastop *); |
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struct x86_emulate_ctxt { |
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void *vcpu; |
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const struct x86_emulate_ops *ops; |
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/* Register state before/after emulation. */ |
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unsigned long eflags; |
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unsigned long eip; /* eip before instruction emulation */ |
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/* Emulated execution mode, represented by an X86EMUL_MODE value. */ |
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enum x86emul_mode mode; |
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/* interruptibility state, as a result of execution of STI or MOV SS */ |
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int interruptibility; |
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bool perm_ok; /* do not check permissions if true */ |
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bool ud; /* inject an #UD if host doesn't support insn */ |
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bool tf; /* TF value before instruction (after for syscall/sysret) */ |
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bool have_exception; |
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struct x86_exception exception; |
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/* GPA available */ |
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bool gpa_available; |
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gpa_t gpa_val; |
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/* |
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* decode cache |
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*/ |
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/* current opcode length in bytes */ |
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u8 opcode_len; |
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u8 b; |
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u8 intercept; |
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u8 op_bytes; |
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u8 ad_bytes; |
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union { |
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int (*execute)(struct x86_emulate_ctxt *ctxt); |
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fastop_t fop; |
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}; |
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int (*check_perm)(struct x86_emulate_ctxt *ctxt); |
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/* |
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* The following six fields are cleared together, |
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* the rest are initialized unconditionally in x86_decode_insn |
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* or elsewhere |
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*/ |
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bool rip_relative; |
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u8 rex_prefix; |
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u8 lock_prefix; |
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u8 rep_prefix; |
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/* bitmaps of registers in _regs[] that can be read */ |
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u32 regs_valid; |
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/* bitmaps of registers in _regs[] that have been written */ |
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u32 regs_dirty; |
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/* modrm */ |
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u8 modrm; |
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u8 modrm_mod; |
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u8 modrm_reg; |
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u8 modrm_rm; |
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u8 modrm_seg; |
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u8 seg_override; |
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u64 d; |
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unsigned long _eip; |
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/* Here begins the usercopy section. */ |
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struct operand src; |
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struct operand src2; |
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struct operand dst; |
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struct operand memop; |
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unsigned long _regs[NR_VCPU_REGS]; |
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struct operand *memopp; |
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struct fetch_cache fetch; |
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struct read_cache io_read; |
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struct read_cache mem_read; |
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}; |
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/* Repeat String Operation Prefix */ |
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#define REPE_PREFIX 0xf3 |
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#define REPNE_PREFIX 0xf2 |
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/* CPUID vendors */ |
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#define X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx 0x68747541 |
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#define X86EMUL_CPUID_VENDOR_AuthenticAMD_ecx 0x444d4163 |
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#define X86EMUL_CPUID_VENDOR_AuthenticAMD_edx 0x69746e65 |
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#define X86EMUL_CPUID_VENDOR_AMDisbetterI_ebx 0x69444d41 |
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#define X86EMUL_CPUID_VENDOR_AMDisbetterI_ecx 0x21726574 |
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#define X86EMUL_CPUID_VENDOR_AMDisbetterI_edx 0x74656273 |
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#define X86EMUL_CPUID_VENDOR_HygonGenuine_ebx 0x6f677948 |
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#define X86EMUL_CPUID_VENDOR_HygonGenuine_ecx 0x656e6975 |
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#define X86EMUL_CPUID_VENDOR_HygonGenuine_edx 0x6e65476e |
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#define X86EMUL_CPUID_VENDOR_GenuineIntel_ebx 0x756e6547 |
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#define X86EMUL_CPUID_VENDOR_GenuineIntel_ecx 0x6c65746e |
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#define X86EMUL_CPUID_VENDOR_GenuineIntel_edx 0x49656e69 |
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#define X86EMUL_CPUID_VENDOR_CentaurHauls_ebx 0x746e6543 |
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#define X86EMUL_CPUID_VENDOR_CentaurHauls_ecx 0x736c7561 |
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#define X86EMUL_CPUID_VENDOR_CentaurHauls_edx 0x48727561 |
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static inline bool is_guest_vendor_intel(u32 ebx, u32 ecx, u32 edx) |
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{ |
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return ebx == X86EMUL_CPUID_VENDOR_GenuineIntel_ebx && |
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ecx == X86EMUL_CPUID_VENDOR_GenuineIntel_ecx && |
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edx == X86EMUL_CPUID_VENDOR_GenuineIntel_edx; |
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} |
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static inline bool is_guest_vendor_amd(u32 ebx, u32 ecx, u32 edx) |
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{ |
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return (ebx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx && |
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ecx == X86EMUL_CPUID_VENDOR_AuthenticAMD_ecx && |
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edx == X86EMUL_CPUID_VENDOR_AuthenticAMD_edx) || |
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(ebx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ebx && |
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ecx == X86EMUL_CPUID_VENDOR_AMDisbetterI_ecx && |
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edx == X86EMUL_CPUID_VENDOR_AMDisbetterI_edx); |
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} |
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static inline bool is_guest_vendor_hygon(u32 ebx, u32 ecx, u32 edx) |
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{ |
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return ebx == X86EMUL_CPUID_VENDOR_HygonGenuine_ebx && |
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ecx == X86EMUL_CPUID_VENDOR_HygonGenuine_ecx && |
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edx == X86EMUL_CPUID_VENDOR_HygonGenuine_edx; |
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} |
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enum x86_intercept_stage { |
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X86_ICTP_NONE = 0, /* Allow zero-init to not match anything */ |
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X86_ICPT_PRE_EXCEPT, |
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X86_ICPT_POST_EXCEPT, |
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X86_ICPT_POST_MEMACCESS, |
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}; |
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enum x86_intercept { |
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x86_intercept_none, |
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x86_intercept_cr_read, |
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x86_intercept_cr_write, |
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x86_intercept_clts, |
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x86_intercept_lmsw, |
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x86_intercept_smsw, |
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x86_intercept_dr_read, |
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x86_intercept_dr_write, |
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x86_intercept_lidt, |
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x86_intercept_sidt, |
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x86_intercept_lgdt, |
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x86_intercept_sgdt, |
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x86_intercept_lldt, |
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x86_intercept_sldt, |
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x86_intercept_ltr, |
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x86_intercept_str, |
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x86_intercept_rdtsc, |
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x86_intercept_rdpmc, |
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x86_intercept_pushf, |
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x86_intercept_popf, |
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x86_intercept_cpuid, |
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x86_intercept_rsm, |
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x86_intercept_iret, |
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x86_intercept_intn, |
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x86_intercept_invd, |
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x86_intercept_pause, |
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x86_intercept_hlt, |
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x86_intercept_invlpg, |
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x86_intercept_invlpga, |
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x86_intercept_vmrun, |
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x86_intercept_vmload, |
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x86_intercept_vmsave, |
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x86_intercept_vmmcall, |
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x86_intercept_stgi, |
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x86_intercept_clgi, |
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x86_intercept_skinit, |
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x86_intercept_rdtscp, |
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x86_intercept_rdpid, |
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x86_intercept_icebp, |
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x86_intercept_wbinvd, |
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x86_intercept_monitor, |
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x86_intercept_mwait, |
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x86_intercept_rdmsr, |
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x86_intercept_wrmsr, |
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x86_intercept_in, |
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x86_intercept_ins, |
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x86_intercept_out, |
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x86_intercept_outs, |
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x86_intercept_xsetbv, |
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nr_x86_intercepts |
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}; |
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/* Host execution mode. */ |
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#if defined(CONFIG_X86_32) |
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#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT32 |
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#elif defined(CONFIG_X86_64) |
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#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT64 |
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#endif |
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int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len); |
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bool x86_page_table_writing_insn(struct x86_emulate_ctxt *ctxt); |
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#define EMULATION_FAILED -1 |
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#define EMULATION_OK 0 |
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#define EMULATION_RESTART 1 |
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#define EMULATION_INTERCEPTED 2 |
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void init_decode_cache(struct x86_emulate_ctxt *ctxt); |
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int x86_emulate_insn(struct x86_emulate_ctxt *ctxt); |
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int emulator_task_switch(struct x86_emulate_ctxt *ctxt, |
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u16 tss_selector, int idt_index, int reason, |
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bool has_error_code, u32 error_code); |
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int emulate_int_real(struct x86_emulate_ctxt *ctxt, int irq); |
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void emulator_invalidate_register_cache(struct x86_emulate_ctxt *ctxt); |
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void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt); |
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bool emulator_can_use_gpa(struct x86_emulate_ctxt *ctxt); |
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#endif /* _ASM_X86_KVM_X86_EMULATE_H */
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