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
63  * location, that this location is the given linear faulting address (cr2), and
66  * automatically deduces which operand of a string-move operation is accessing
77  *     some out-of-band mechanism, unknown to the emulator. The memop signals
81  *     cmpxchg8b_emulated need support 8-byte accesses.
82  *  4. The emulator cannot handle 64-bit mode emulation on an x86/32 system.
97 /* x86-specific emulation flags */
108 	 * read_gpr: read a general purpose register (rax - r15)
114 	 * write_gpr: write a general purpose register (rax - r15)
121 	 * read_std: Read bytes of standard (non-emulated/special) memory.
123 	 *  @addr:  [IN ] Linear address from which to read.
124 	 *  @val:   [OUT] Value read from memory, zero-extended to 'u_long'.
134 	 * write_std: Write bytes of standard (non-emulated/special) memory.
136 	 *  @addr:  [IN ] Linear address to which to write.
137 	 *  @val:   [OUT] Value write to memory, zero-extended to 'u_long'.
145 	 * fetch: Read bytes of standard (non-emulated/special) memory.
147 	 *  @addr:  [IN ] Linear address from which to read.
148 	 *  @val:   [OUT] Value read from memory, zero-extended to 'u_long'.
157 	 *  @addr:  [IN ] Linear address from which to read.
158 	 *  @val:   [OUT] Value read from memory, zero-extended to 'u_long'.
167 	 *  @addr:  [IN ] Linear address to which to write.
168 	 *  @val:   [IN ] Value to write to memory (low-order bytes used as
180 	 *  @addr:  [IN ] Linear address to access.
250 /* Type, address-of, and value of an instruction's operand. */
296 	X86EMUL_MODE_PROT16,	/* 16-bit protected mode. */
297 	X86EMUL_MODE_PROT32,	/* 32-bit protected mode. */
298 	X86EMUL_MODE_PROT64,	/* 64-bit (long) mode.    */
302  * fastop functions are declared as taking a never-defined fastop parameter,
396 		ctxt->ops->vm_bugged(ctxt);	\
450 	X86_ICTP_NONE = 0,   /* Allow zero-init to not match anything */
519 #define EMULATION_FAILED -1
536 		nr &= NR_EMULATOR_GPRS - 1;  in reg_read()
538 	if (!(ctxt->regs_valid & (1 << nr))) {  in reg_read()
539 		ctxt->regs_valid |= 1 << nr;  in reg_read()
540 		ctxt->_regs[nr] = ctxt->ops->read_gpr(ctxt, nr);  in reg_read()
542 	return ctxt->_regs[nr];  in reg_read()
548 		nr &= NR_EMULATOR_GPRS - 1;  in reg_write()
550 	BUILD_BUG_ON(sizeof(ctxt->regs_dirty) * BITS_PER_BYTE < NR_EMULATOR_GPRS);  in reg_write()
551 	BUILD_BUG_ON(sizeof(ctxt->regs_valid) * BITS_PER_BYTE < NR_EMULATOR_GPRS);  in reg_write()
553 	ctxt->regs_valid |= 1 << nr;  in reg_write()
554 	ctxt->regs_dirty |= 1 << nr;  in reg_write()
555 	return &ctxt->_regs[nr];  in reg_write()