/* * Copyright (c) 2000-2007 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ */ /* * Mach Operating System * Copyright (c) 1991,1990 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #define _ARCH_I386_ASM_HELP_H_ /* Prevent inclusion of user header */ #include #include /* * Fault recovery. */ #ifdef __MACHO__ #define RECOVERY_SECTION .section __VECTORS, __recover #else #define RECOVERY_SECTION .text #define RECOVERY_SECTION .text #endif #define RECOVER_TABLE_START \ .align 3 ; \ .globl EXT(recover_table) ;\ LEXT(recover_table) ;\ .text #define RECOVER(addr) \ .align 3; \ .quad 9f ;\ .quad addr ;\ .text ;\ 9: #define RECOVER_TABLE_END \ .align 3 ;\ .globl EXT(recover_table_end) ;\ LEXT(recover_table_end) ;\ .text /* * Allocate recovery and table. */ RECOVERY_SECTION RECOVER_TABLE_START /* * int rdmsr_carefully(uint32_t msr, uint32_t *lo, uint32_t *hi) */ ENTRY(rdmsr_carefully) movl %edi, %ecx movq %rdx, %rdi RECOVERY_SECTION RECOVER(rdmsr_fail) rdmsr movl %eax, (%rsi) movl %edx, (%rdi) xorl %eax, %eax ret rdmsr_fail: movq $1, %rax ret /* * int rdmsr64_carefully(uint32_t msr, uint64_t *val); */ ENTRY(rdmsr64_carefully) movl %edi, %ecx RECOVERY_SECTION RECOVER(rdmsr64_carefully_fail) rdmsr movl %eax, (%rsi) movl %edx, 4(%rsi) xorl %eax, %eax ret rdmsr64_carefully_fail: movl $1, %eax ret /* * int wrmsr64_carefully(uint32_t msr, uint64_t val); */ ENTRY(wrmsr_carefully) movl %edi, %ecx movl %esi, %eax shr $32, %rsi movl %esi, %edx RECOVERY_SECTION RECOVER(wrmsr_fail) wrmsr xorl %eax, %eax ret wrmsr_fail: movl $1, %eax ret .globl EXT(thread_exception_return) .globl EXT(thread_bootstrap_return) LEXT(thread_bootstrap_return) #if CONFIG_DTRACE call EXT(dtrace_thread_bootstrap) #endif LEXT(thread_exception_return) cli xorl %ecx, %ecx /* don't check if we're in the PFZ */ jmp EXT(return_from_trap) /* * Copyin/out from user/kernel address space. * rdi: source address * rsi: destination address * rdx: byte count */ Entry(_bcopy) // TODO not pop regs; movq; think about 32 bit or 64 bit byte count xchgq %rdi, %rsi /* source %rsi, dest %rdi */ cld /* count up */ movl %edx,%ecx /* move by longwords first */ shrl $3,%ecx RECOVERY_SECTION RECOVER(_bcopy_fail) rep movsq /* move longwords */ movl %edx,%ecx /* now move remaining bytes */ andl $7,%ecx RECOVERY_SECTION RECOVER(_bcopy_fail) rep movsb xorl %eax,%eax /* return 0 for success */ ret /* and return */ _bcopy_fail: movl $(EFAULT),%eax /* return error for failure */ ret Entry(pmap_safe_read) RECOVERY_SECTION RECOVER(_pmap_safe_read_fail) movq (%rdi), %rcx mov %rcx, (%rsi) mov $1, %eax ret _pmap_safe_read_fail: xor %eax, %eax ret /* * Copyin string from user/kern address space. * rdi: source address * rsi: destination address * rdx: max byte count * rcx: actual byte count (OUT) */ Entry(_bcopystr) pushq %rdi xchgq %rdi, %rsi /* source %rsi, dest %rdi */ xorl %eax,%eax /* set to 0 here so that high 24 bits */ /* are 0 for the cmpl against 0 */ 2: RECOVERY_SECTION RECOVER(_bcopystr_fail) /* copy bytes... */ movb (%rsi),%al incq %rsi testq %rdi,%rdi /* if kernel address is ... */ jz 3f /* not NULL */ movb %al,(%rdi) /* copy the byte */ incq %rdi 3: testl %eax,%eax /* did we just stuff the 0-byte? */ jz 4f /* yes, return 0 already in %eax */ decq %rdx /* decrement #bytes left in buffer */ jnz 2b /* buffer not full, copy another byte */ movl $(ENAMETOOLONG),%eax /* buffer full, no \0: ENAMETOOLONG */ 4: cmpq $0,%rcx /* get OUT len ptr */ jz _bcopystr_ret /* if null, just return */ subq (%rsp),%rsi movq %rsi,(%rcx) /* else set OUT arg to xfer len */ popq %rdi /* restore registers */ _bcopystr_ret: ret /* and return */ _bcopystr_fail: popq %rdi /* restore registers */ movl $(EFAULT),%eax /* return error for failure */ ret /* * Done with recovery table. */ RECOVERY_SECTION RECOVER_TABLE_END