x86/kvm/kvm_emulate.h

1 /* SPDX-License-Identifier: GPL-2.0 */
5  * Generic x86 (32-bit and 64-bit) instruction decoder and emulator.
9  * From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4
59  * location, that this location is the given linear faulting address (cr2), and
62  * automatically deduces which operand of a string-move operation is accessing
73  *     some out-of-band mechanism, unknown to the emulator. The memop signals
77  *     cmpxchg8b_emulated need support 8-byte accesses.
78  *  4. The emulator cannot handle 64-bit mode emulation on an x86/32 system.
91 /* x86-specific emulation flags */
100 	 * read_gpr: read a general purpose register (rax - r15)
106 	 * write_gpr: write a general purpose register (rax - r15)
113 	 * read_std: Read bytes of standard (non-emulated/special) memory.
115 	 *  @addr:  [IN ] Linear address from which to read.
116 	 *  @val:   [OUT] Value read from memory, zero-extended to 'u_long'.
126 	 * write_std: Write bytes of standard (non-emulated/special) memory.
128 	 *  @addr:  [IN ] Linear address to which to write.
129 	 *  @val:   [OUT] Value write to memory, zero-extended to 'u_long'.
137 	 * fetch: Read bytes of standard (non-emulated/special) memory.
139 	 *  @addr:  [IN ] Linear address from which to read.
140 	 *  @val:   [OUT] Value read from memory, zero-extended to 'u_long'.
149 	 *  @addr:  [IN ] Linear address from which to read.
150 	 *  @val:   [OUT] Value read from memory, zero-extended to 'u_long'.
159 	 *  @addr:  [IN ] Linear address to which to write.
160 	 *  @val:   [IN ] Value to write to memory (low-order bytes used as
172 	 *  @addr:  [IN ] Linear address to access.
238 /* Type, address-of, and value of an instruction's operand. */
282 	X86EMUL_MODE_PROT16,	/* 16-bit protected mode. */
283 	X86EMUL_MODE_PROT32,	/* 32-bit protected mode. */
284 	X86EMUL_MODE_PROT64,	/* 64-bit (long) mode.    */
288  * fastop functions are declared as taking a never-defined fastop parameter,
382 		ctxt->ops->vm_bugged(ctxt);	\
436 	X86_ICTP_NONE = 0,   /* Allow zero-init to not match anything */
505 #define EMULATION_FAILED -1
522 		nr &= NR_EMULATOR_GPRS - 1;  in reg_read()
524 	if (!(ctxt->regs_valid & (1 << nr))) {  in reg_read()
525 		ctxt->regs_valid |= 1 << nr;  in reg_read()
526 		ctxt->_regs[nr] = ctxt->ops->read_gpr(ctxt, nr);  in reg_read()
528 	return ctxt->_regs[nr];  in reg_read()
534 		nr &= NR_EMULATOR_GPRS - 1;  in reg_write()
536 	BUILD_BUG_ON(sizeof(ctxt->regs_dirty) * BITS_PER_BYTE < NR_EMULATOR_GPRS);  in reg_write()
537 	BUILD_BUG_ON(sizeof(ctxt->regs_valid) * BITS_PER_BYTE < NR_EMULATOR_GPRS);  in reg_write()
539 	ctxt->regs_valid |= 1 << nr;  in reg_write()
540 	ctxt->regs_dirty |= 1 << nr;  in reg_write()
541 	return &ctxt->_regs[nr];  in reg_write()