131 lines
6.7 KiB
C
131 lines
6.7 KiB
C
/*
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* Copyright (C) 2015-2016, Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef CPU_X86_MM_TSS_PROT_DOMAINS_H_
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#define CPU_X86_MM_TSS_PROT_DOMAINS_H_
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include "ldt-layout.h"
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#include "segmentation.h"
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#include "tss.h"
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struct dom_kern_data {
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/** Task State Segment */
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tss_t tss;
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/** Local Descriptor Table with per-domain descriptors */
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segment_desc_t ldt[LDT_NUM_DESC];
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} __attribute__((packed));
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/* relies on dom_kern_data: */
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#include "multi-segment.h"
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/* relies on ATTR_KERN_ADDR_SPACE: */
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#include "syscalls.h"
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/**
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* Data associated with each protection domain that is owned by clients of that
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* domain and used to identify the domain.
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*/
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struct dom_client_data {
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dom_id_t dom_id;
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/** The selector is only 16 bits, but it is padded to 32 bits. */
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uint32_t tss_sel;
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};
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extern uint32_t prot_domains_main_esp;
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#define SYSCALLS_STUB_MIDDLE(nm) \
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/* If already in the callee protection domain, skip the protection */ \
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/* domain switch and directly invoke the system call body */ \
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" je _syscall_" #nm "\n\t" \
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" movl $" EXP_STRINGIFY(_syscall_ent_##nm) ", prot_domains_syscall\n\t" \
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" mov %esp, prot_domains_main_esp\n\t"
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#define SYSCALLS_STUB(nm) \
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SYSCALLS_ALLOC_ENTRYPOINT(nm); \
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asm ( \
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".text\n\t" \
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".global " #nm "\n\t" \
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#nm ":\n\t" \
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" str %ax\n\t" \
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/* Compare current Task Register selector to selector for callee */ \
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/* protection domain, in tss_sel field of dom_client_data */ \
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" cmpw %ax, 8(%esp)\n\t" \
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SYSCALLS_STUB_MIDDLE(nm) \
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/* This will treat the dom_id field as the offset for the call, but */ \
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/* that is ignored when performing a far call to a task */ \
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" lcall *4(%esp)\n\t" \
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" ret\n\t")
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#define SYSCALLS_STUB_SINGLETON(nm, dcd) \
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SYSCALLS_ALLOC_ENTRYPOINT(nm); \
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asm ( \
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".text\n\t" \
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".global " #nm "\n\t" \
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#nm ":\n\t" \
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" str %ax\n\t" \
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/* Compare current Task Register selector to selector for callee */ \
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/* protection domain, in tss_sel field of dom_client_data */ \
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" cmpw %ax, %" SEG_KERN "s:(4 + " #dcd ")\n\t" \
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SYSCALLS_STUB_MIDDLE(nm) \
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/* This will treat the dom_id field as the offset for the call, but */ \
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/* that is ignored when performing a far call to a task */ \
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" lcall *%" SEG_KERN "s:" #dcd "\n\t" \
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" ret\n\t")
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#define PROT_DOMAINS_ENTER_ISR(exc) \
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MULTI_SEGMENT_ENTER_ISR(exc) \
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/* It is possible that the system call dispatcher is being interrupted, */ \
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/* and some interrupt handlers perform system calls. Thus, it is */ \
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/* necessary to save and restore the system call dispatcher parameters */ \
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/* (in callee-saved registers). */ \
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"mov prot_domains_main_esp, %%esi\n\t" \
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"mov prot_domains_syscall, %%edi\n\t" \
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PROT_DOMAINS_ENTER_ISR_COMMON(exc)
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#define PROT_DOMAINS_LEAVE_ISR(exc) \
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PROT_DOMAINS_LEAVE_ISR_COMMON(exc) \
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"mov %%edi, prot_domains_syscall\n\t" \
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"mov %%esi, prot_domains_main_esp\n\t" \
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MULTI_SEGMENT_LEAVE_ISR(exc)
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/* Allocate two additional GDT entries for each protection domain. Note that
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* the particular storage allocated by this statement may actually be used for
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* some other protection domain, depending on how the linker happens to arrange
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* all of the GDT storage. The GDT_IDX_TSS and GDT_IDX_LDT macros in
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* gdt-layout.h determine which storage is used for each protection domain.
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* Thus, this storage should not be referenced directly by its variable name.
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*/
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#define PROT_DOMAINS_ALLOC_IMPL(nm) \
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static segment_desc_t ATTR_BSS_GDT_MID _gdt_storage_##nm[2]
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#endif /* CPU_X86_MM_TSS_PROT_DOMAINS_H_ */
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