2c66cccab7
the kernel on amd64. Fill and read segment registers for mcontext and signals. Handle traps caused by restoration of the invalidated selectors. Implement user-mode creation and manipulation of the process-specific LDT descriptors for amd64, see sysarch(2). Implement support for TSS i/o port access permission bitmap for amd64. Context-switch LDT and TSS. Do not save and restore segment registers on the context switch, that is handled by kernel enter/leave trampolines now. Remove segment restore code from the signal trampolines for freebsd/amd64, freebsd/ia32 and linux/i386 for the same reason. Implement amd64-specific compat shims for sysarch. Linuxolator (temporary ?) switched to use gsbase for thread_area pointer. TODO: Currently, gdb is not adapted to show segment registers from struct reg. Also, no machine-depended ptrace command is added to set segment registers for debugged process. In collaboration with: pho Discussed with: peter Reviewed by: jhb Linuxolator tested by: dchagin
248 lines
9.8 KiB
C
248 lines
9.8 KiB
C
/*-
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* Copyright (c) 1989, 1990 William F. Jolitz
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)segments.h 7.1 (Berkeley) 5/9/91
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* $FreeBSD$
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*/
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#ifndef _MACHINE_SEGMENTS_H_
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#define _MACHINE_SEGMENTS_H_
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/*
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* AMD64 Segmentation Data Structures and definitions
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*/
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/*
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* Selectors
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*/
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#define SEL_RPL_MASK 3 /* requester priv level */
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#define ISPL(s) ((s)&3) /* what is the priority level of a selector */
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#define SEL_KPL 0 /* kernel priority level */
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#define SEL_UPL 3 /* user priority level */
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#define ISLDT(s) ((s)&SEL_LDT) /* is it local or global */
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#define SEL_LDT 4 /* local descriptor table */
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#define IDXSEL(s) (((s)>>3) & 0x1fff) /* index of selector */
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#define LSEL(s,r) (((s)<<3) | SEL_LDT | r) /* a local selector */
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#define GSEL(s,r) (((s)<<3) | r) /* a global selector */
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/*
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* User segment descriptors (%cs, %ds etc for compatability apps. 64 bit wide)
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* For long-mode apps, %cs only has the conforming bit in sd_type, the sd_dpl,
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* sd_p, sd_l and sd_def32 which must be zero). %ds only has sd_p.
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*/
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struct user_segment_descriptor {
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u_int64_t sd_lolimit:16; /* segment extent (lsb) */
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u_int64_t sd_lobase:24; /* segment base address (lsb) */
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u_int64_t sd_type:5; /* segment type */
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u_int64_t sd_dpl:2; /* segment descriptor priority level */
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u_int64_t sd_p:1; /* segment descriptor present */
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u_int64_t sd_hilimit:4; /* segment extent (msb) */
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u_int64_t sd_xx:1; /* unused */
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u_int64_t sd_long:1; /* long mode (cs only) */
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u_int64_t sd_def32:1; /* default 32 vs 16 bit size */
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u_int64_t sd_gran:1; /* limit granularity (byte/page units)*/
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u_int64_t sd_hibase:8; /* segment base address (msb) */
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} __packed;
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/*
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* System segment descriptors (128 bit wide)
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*/
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struct system_segment_descriptor {
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u_int64_t sd_lolimit:16; /* segment extent (lsb) */
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u_int64_t sd_lobase:24; /* segment base address (lsb) */
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u_int64_t sd_type:5; /* segment type */
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u_int64_t sd_dpl:2; /* segment descriptor priority level */
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u_int64_t sd_p:1; /* segment descriptor present */
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u_int64_t sd_hilimit:4; /* segment extent (msb) */
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u_int64_t sd_xx0:3; /* unused */
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u_int64_t sd_gran:1; /* limit granularity (byte/page units)*/
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u_int64_t sd_hibase:40 __packed;/* segment base address (msb) */
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u_int64_t sd_xx1:8;
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u_int64_t sd_mbz:5; /* MUST be zero */
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u_int64_t sd_xx2:19;
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} __packed;
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/*
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* Gate descriptors (e.g. indirect descriptors, trap, interrupt etc. 128 bit)
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* Only interrupt and trap gates have gd_ist.
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*/
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struct gate_descriptor {
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u_int64_t gd_looffset:16; /* gate offset (lsb) */
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u_int64_t gd_selector:16; /* gate segment selector */
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u_int64_t gd_ist:3; /* IST table index */
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u_int64_t gd_xx:5; /* unused */
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u_int64_t gd_type:5; /* segment type */
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u_int64_t gd_dpl:2; /* segment descriptor priority level */
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u_int64_t gd_p:1; /* segment descriptor present */
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u_int64_t gd_hioffset:48 __packed; /* gate offset (msb) */
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u_int64_t sd_xx1:32;
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} __packed;
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/*
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* Generic descriptor
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*/
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union descriptor {
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struct user_segment_descriptor sd;
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struct gate_descriptor gd;
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};
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/* system segments and gate types */
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#define SDT_SYSNULL 0 /* system null */
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#define SDT_SYS286TSS 1 /* system 286 TSS available */
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#define SDT_SYSLDT 2 /* system 64 bit local descriptor table */
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#define SDT_SYS286BSY 3 /* system 286 TSS busy */
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#define SDT_SYS286CGT 4 /* system 286 call gate */
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#define SDT_SYSTASKGT 5 /* system task gate */
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#define SDT_SYS286IGT 6 /* system 286 interrupt gate */
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#define SDT_SYS286TGT 7 /* system 286 trap gate */
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#define SDT_SYSNULL2 8 /* system null again */
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#define SDT_SYSTSS 9 /* system available 64 bit TSS */
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#define SDT_SYSNULL3 10 /* system null again */
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#define SDT_SYSBSY 11 /* system busy 64 bit TSS */
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#define SDT_SYSCGT 12 /* system 64 bit call gate */
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#define SDT_SYSNULL4 13 /* system null again */
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#define SDT_SYSIGT 14 /* system 64 bit interrupt gate */
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#define SDT_SYSTGT 15 /* system 64 bit trap gate */
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/* memory segment types */
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#define SDT_MEMRO 16 /* memory read only */
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#define SDT_MEMROA 17 /* memory read only accessed */
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#define SDT_MEMRW 18 /* memory read write */
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#define SDT_MEMRWA 19 /* memory read write accessed */
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#define SDT_MEMROD 20 /* memory read only expand dwn limit */
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#define SDT_MEMRODA 21 /* memory read only expand dwn limit accessed */
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#define SDT_MEMRWD 22 /* memory read write expand dwn limit */
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#define SDT_MEMRWDA 23 /* memory read write expand dwn limit accessed */
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#define SDT_MEME 24 /* memory execute only */
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#define SDT_MEMEA 25 /* memory execute only accessed */
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#define SDT_MEMER 26 /* memory execute read */
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#define SDT_MEMERA 27 /* memory execute read accessed */
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#define SDT_MEMEC 28 /* memory execute only conforming */
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#define SDT_MEMEAC 29 /* memory execute only accessed conforming */
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#define SDT_MEMERC 30 /* memory execute read conforming */
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#define SDT_MEMERAC 31 /* memory execute read accessed conforming */
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/*
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* Software definitions are in this convenient format,
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* which are translated into inconvenient segment descriptors
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* when needed to be used by the 386 hardware
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*/
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struct soft_segment_descriptor {
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unsigned long ssd_base; /* segment base address */
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unsigned long ssd_limit; /* segment extent */
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unsigned long ssd_type:5; /* segment type */
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unsigned long ssd_dpl:2; /* segment descriptor priority level */
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unsigned long ssd_p:1; /* segment descriptor present */
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unsigned long ssd_long:1; /* long mode (for %cs) */
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unsigned long ssd_def32:1; /* default 32 vs 16 bit size */
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unsigned long ssd_gran:1; /* limit granularity (byte/page units)*/
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} __packed;
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/*
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* region descriptors, used to load gdt/idt tables before segments yet exist.
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*/
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struct region_descriptor {
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unsigned long rd_limit:16; /* segment extent */
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unsigned long rd_base:64 __packed; /* base address */
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} __packed;
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/*
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* Size of IDT table
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*/
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#define NIDT 256 /* 32 reserved, 16 h/w, 0 s/w, linux's 0x80 */
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#define NRSVIDT 32 /* reserved entries for cpu exceptions */
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/*
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* Entries in the Interrupt Descriptor Table (IDT)
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*/
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#define IDT_DE 0 /* #DE: Divide Error */
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#define IDT_DB 1 /* #DB: Debug */
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#define IDT_NMI 2 /* Nonmaskable External Interrupt */
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#define IDT_BP 3 /* #BP: Breakpoint */
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#define IDT_OF 4 /* #OF: Overflow */
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#define IDT_BR 5 /* #BR: Bound Range Exceeded */
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#define IDT_UD 6 /* #UD: Undefined/Invalid Opcode */
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#define IDT_NM 7 /* #NM: No Math Coprocessor */
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#define IDT_DF 8 /* #DF: Double Fault */
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#define IDT_FPUGP 9 /* Coprocessor Segment Overrun */
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#define IDT_TS 10 /* #TS: Invalid TSS */
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#define IDT_NP 11 /* #NP: Segment Not Present */
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#define IDT_SS 12 /* #SS: Stack Segment Fault */
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#define IDT_GP 13 /* #GP: General Protection Fault */
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#define IDT_PF 14 /* #PF: Page Fault */
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#define IDT_MF 16 /* #MF: FPU Floating-Point Error */
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#define IDT_AC 17 /* #AC: Alignment Check */
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#define IDT_MC 18 /* #MC: Machine Check */
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#define IDT_XF 19 /* #XF: SIMD Floating-Point Exception */
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#define IDT_IO_INTS NRSVIDT /* Base of IDT entries for I/O interrupts. */
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#define IDT_SYSCALL 0x80 /* System Call Interrupt Vector */
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/*
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* Entries in the Global Descriptor Table (GDT)
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*/
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#define GNULL_SEL 0 /* Null Descriptor */
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#define GNULL2_SEL 1 /* Null Descriptor */
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#define GUFS32_SEL 2 /* User 32 bit %fs Descriptor */
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#define GUGS32_SEL 3 /* User 32 bit %gs Descriptor */
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#define GCODE_SEL 4 /* Kernel Code Descriptor */
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#define GDATA_SEL 5 /* Kernel Data Descriptor */
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#define GUCODE32_SEL 6 /* User 32 bit code Descriptor */
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#define GUDATA_SEL 7 /* User 32/64 bit Data Descriptor */
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#define GUCODE_SEL 8 /* User 64 bit Code Descriptor */
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#define GPROC0_SEL 9 /* TSS for entering kernel etc */
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/* slot 10 is second half of GPROC0_SEL */
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#define GUSERLDT_SEL 11 /* LDT */
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/* slot 11 is second half of GUSERLDT_SEL */
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#define NGDT 13
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#ifdef _KERNEL
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extern struct user_segment_descriptor gdt[];
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extern struct soft_segment_descriptor gdt_segs[];
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extern struct gate_descriptor *idt;
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extern struct region_descriptor r_gdt, r_idt;
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void lgdt(struct region_descriptor *rdp);
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void sdtossd(struct user_segment_descriptor *sdp,
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struct soft_segment_descriptor *ssdp);
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void ssdtosd(struct soft_segment_descriptor *ssdp,
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struct user_segment_descriptor *sdp);
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void ssdtosyssd(struct soft_segment_descriptor *ssdp,
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struct system_segment_descriptor *sdp);
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void update_gdt_gsbase(struct thread *td, uint32_t base);
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void update_gdt_fsbase(struct thread *td, uint32_t base);
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#endif /* _KERNEL */
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#endif /* !_MACHINE_SEGMENTS_H_ */
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