858259cf7d
Patch imlements full LDT handling in SKAS: * UML holds it's own LDT table, used to deliver data on modify_ldt(READ) * UML disables the default_ldt, inherited from the host (SKAS3) or resets LDT entries, set by host's clib and inherited in SKAS0 * A new global variable skas_needs_stub is inserted, that can be used to decide, whether stub-pages must be supported or not. * Uses the syscall-stub to replace missing PTRACE_LDT (therefore, write_ldt_entry needs to be modified) Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
/*
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* Copyright (C) 2004 Fujitsu Siemens Computers GmbH
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* Licensed under the GPL
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*
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* Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
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*/
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#ifndef __ASM_LDT_I386_H
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#define __ASM_LDT_I386_H
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#include "asm/semaphore.h"
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#include "asm/arch/ldt.h"
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struct mmu_context_skas;
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extern void ldt_host_info(void);
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extern long init_new_ldt(struct mmu_context_skas * to_mm,
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struct mmu_context_skas * from_mm);
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extern void free_ldt(struct mmu_context_skas * mm);
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#define LDT_PAGES_MAX \
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((LDT_ENTRIES * LDT_ENTRY_SIZE)/PAGE_SIZE)
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#define LDT_ENTRIES_PER_PAGE \
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(PAGE_SIZE/LDT_ENTRY_SIZE)
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#define LDT_DIRECT_ENTRIES \
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((LDT_PAGES_MAX*sizeof(void *))/LDT_ENTRY_SIZE)
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struct ldt_entry {
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__u32 a;
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__u32 b;
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};
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typedef struct uml_ldt {
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int entry_count;
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struct semaphore semaphore;
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union {
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struct ldt_entry * pages[LDT_PAGES_MAX];
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struct ldt_entry entries[LDT_DIRECT_ENTRIES];
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};
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} uml_ldt_t;
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/*
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* macros stolen from include/asm-i386/desc.h
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*/
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#define LDT_entry_a(info) \
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((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
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#define LDT_entry_b(info) \
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(((info)->base_addr & 0xff000000) | \
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(((info)->base_addr & 0x00ff0000) >> 16) | \
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((info)->limit & 0xf0000) | \
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(((info)->read_exec_only ^ 1) << 9) | \
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((info)->contents << 10) | \
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(((info)->seg_not_present ^ 1) << 15) | \
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((info)->seg_32bit << 22) | \
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((info)->limit_in_pages << 23) | \
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((info)->useable << 20) | \
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0x7000)
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#define LDT_empty(info) (\
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(info)->base_addr == 0 && \
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(info)->limit == 0 && \
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(info)->contents == 0 && \
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(info)->read_exec_only == 1 && \
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(info)->seg_32bit == 0 && \
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(info)->limit_in_pages == 0 && \
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(info)->seg_not_present == 1 && \
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(info)->useable == 0 )
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#endif
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