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Commit	Line	Data
	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* @OSF_COPYRIGHT@
	24	*/
	25	#include <debug.h>
	26	#include <mach_debug.h>
	27
	28	#include <mach/ppc/thread_status.h>
	29	#include <mach/vm_types.h>
	30	#include <kern/thread.h>
	31	#include <kern/misc_protos.h>
	32	#include <ppc/proc_reg.h>
	33	#include <ppc/pmap.h>
	34	#include <ppc/misc_protos.h>
	35	#include <ppc/exception.h>
	36
	37	/*
	38	* copyin/out_multiple - the assembler copyin/out functions jump to C for
	39	* help when the copyin lies over a segment boundary. The C breaks
	40	* down the copy into two sub-copies and re-calls the assembler with
	41	* these sub-copies. Very rare occurrance. Warning: These functions are
	42	* called whilst active_thread->thread_recover is still set.
	43	*/
	44
	45	extern boolean_t copyin_multiple(const char *src,
	46	char *dst,
	47	vm_size_t count);
	48
	49	boolean_t copyin_multiple(const char *src,
	50	char *dst,
	51	vm_size_t count)
	52	{
	53	const char *midpoint;
	54	vm_size_t first_count;
	55	boolean_t first_result;
	56
	57	/* Assert that we've been called because of a segment boundary,
	58	* this function is more expensive than the assembler, and should
	59	* only be called in this difficult case.
	60	*/
	61	assert(((vm_offset_t)src & 0xF0000000) !=
	62	((vm_offset_t)(src + count -1) & 0xF0000000));
	63
	64	/* TODO NMGS define sensible constants for segments, and apply
	65	* to C and assembler (assembler is much harder)
	66	*/
	67	midpoint = (const char*) ((vm_offset_t)(src + count) & 0xF0000000);
	68	first_count = (midpoint - src);
	69
	70	first_result = copyin(src, dst, first_count);
	71
	72	/* If there was an error, stop now and return error */
	73	if (first_result != 0)
	74	return first_result;
	75
	76	/* otherwise finish the job and return result */
	77	return copyin(midpoint, dst + first_count, count-first_count);
	78	}
	79
	80	extern int copyout_multiple(const char src, char dst, vm_size_t count);
	81
	82	int copyout_multiple(const char src, char dst, vm_size_t count)
	83	{
	84	char *midpoint;
	85	vm_size_t first_count;
	86	boolean_t first_result;
	87
	88	/* Assert that we've been called because of a segment boundary,
	89	* this function is more expensive than the assembler, and should
	90	* only be called in this difficult case. For copyout, the
	91	* segment boundary is on the dst
	92	*/
	93	assert(((vm_offset_t)dst & 0xF0000000) !=
	94	((vm_offset_t)(dst + count - 1) & 0xF0000000));
	95
	96	/* TODO NMGS define sensible constants for segments, and apply
	97	* to C and assembler (assembler is much harder)
	98	*/
	99	midpoint = (char *) ((vm_offset_t)(dst + count) & 0xF0000000);
	100	first_count = (midpoint - dst);
	101
	102	first_result = copyout(src, dst, first_count);
	103
	104	/* If there was an error, stop now and return error */
	105	if (first_result != 0)
	106	return first_result;
	107
	108	/* otherwise finish the job and return result */
	109
	110	return copyout(src + first_count, midpoint, count-first_count);
	111	}
	112