8c6f8f3d5b
64bit and 32bit ABIs. As a side-effect, it enables AVX on capable
CPUs.
In particular:
- Query the CPU support for XSAVE, list of the supported extensions
and the required size of FPU save area. The hw.use_xsave tunable is
provided for disabling XSAVE, and hw.xsave_mask may be used to
select the enabled extensions.
- Remove the FPU save area from PCB and dynamically allocate the
(run-time sized) user save area on the top of the kernel stack,
right above the PCB. Reorganize the thread0 PCB initialization to
postpone it after BSP is queried for save area size.
- The dumppcb, stoppcbs and susppcbs now do not carry the FPU state as
well. FPU state is only useful for suspend, where it is saved in
dynamically allocated suspfpusave area.
- Use XSAVE and XRSTOR to save/restore FPU state, if supported and
enabled.
- Define new mcontext_t flag _MC_HASFPXSTATE, indicating that
mcontext_t has a valid pointer to out-of-struct extended FPU
state. Signal handlers are supplied with stack-allocated fpu
state. The sigreturn(2) and setcontext(2) syscall honour the flag,
allowing the signal handlers to inspect and manipilate extended
state in the interrupted context.
- The getcontext(2) never returns extended state, since there is no
place in the fixed-sized mcontext_t to place variable-sized save
area. And, since mcontext_t is embedded into ucontext_t, makes it
impossible to fix in a reasonable way. Instead of extending
getcontext(2) syscall, provide a sysarch(2) facility to query
extended FPU state.
- Add ptrace(2) support for getting and setting extended state; while
there, implement missed PT_I386_{GET,SET}XMMREGS for 32bit binaries.
- Change fpu_kern KPI to not expose struct fpu_kern_ctx layout to
consumers, making it opaque. Internally, struct fpu_kern_ctx now
contains a space for the extended state. Convert in-kernel consumers
of fpu_kern KPI both on i386 and amd64.
First version of the support for AVX was submitted by Tim Bird
<tim.bird am sony com> on behalf of Sony. This version was written
from scratch.
Tested by: pho (previous version), Yamagi Burmeister <lists yamagi org>
MFC after: 1 month
138 lines
4.4 KiB
C
138 lines
4.4 KiB
C
/*-
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* Copyright (c) 2003 Peter Wemm.
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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: @(#)pcb.h 5.10 (Berkeley) 5/12/91
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* $FreeBSD$
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*/
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#ifndef _AMD64_PCB_H_
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#define _AMD64_PCB_H_
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/*
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* AMD64 process control block
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*/
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#include <machine/fpu.h>
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#include <machine/segments.h>
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struct pcb {
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register_t pcb_r15;
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register_t pcb_r14;
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register_t pcb_r13;
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register_t pcb_r12;
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register_t pcb_rbp;
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register_t pcb_rsp;
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register_t pcb_rbx;
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register_t pcb_rip;
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register_t pcb_fsbase;
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register_t pcb_gsbase;
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register_t pcb_kgsbase;
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register_t pcb_cr0;
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register_t pcb_cr2;
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register_t pcb_cr3;
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register_t pcb_cr4;
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register_t pcb_dr0;
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register_t pcb_dr1;
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register_t pcb_dr2;
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register_t pcb_dr3;
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register_t pcb_dr6;
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register_t pcb_dr7;
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struct region_descriptor pcb_gdt;
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struct region_descriptor pcb_idt;
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struct region_descriptor pcb_ldt;
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uint16_t pcb_tr;
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u_int pcb_flags;
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#define PCB_FULL_IRET 0x01 /* full iret is required */
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#define PCB_DBREGS 0x02 /* process using debug registers */
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#define PCB_KERNFPU 0x04 /* kernel uses fpu */
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#define PCB_FPUINITDONE 0x08 /* fpu state is initialized */
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#define PCB_USERFPUINITDONE 0x10 /* fpu user state is initialized */
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#define PCB_GS32BIT 0x20 /* linux gs switch */
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#define PCB_32BIT 0x40 /* process has 32 bit context (segs etc) */
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uint16_t pcb_initial_fpucw;
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/* copyin/out fault recovery */
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caddr_t pcb_onfault;
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/* 32-bit segment descriptor */
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struct user_segment_descriptor pcb_gs32sd;
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/* local tss, with i/o bitmap; NULL for common */
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struct amd64tss *pcb_tssp;
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struct savefpu *pcb_save;
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uint64_t pcb_pad[2];
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};
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#ifdef _KERNEL
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struct trapframe;
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/*
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* The pcb_flags is only modified by current thread, or by other threads
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* when current thread is stopped. However, current thread may change it
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* from the interrupt context in cpu_switch(), or in the trap handler.
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* When we read-modify-write pcb_flags from C sources, compiler may generate
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* code that is not atomic regarding the interrupt handler. If a trap or
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* interrupt happens and any flag is modified from the handler, it can be
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* clobbered with the cached value later. Therefore, we implement setting
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* and clearing flags with single-instruction functions, which do not race
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* with possible modification of the flags from the trap or interrupt context,
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* because traps and interrupts are executed only on instruction boundary.
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*/
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static __inline void
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set_pcb_flags(struct pcb *pcb, const u_int flags)
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{
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__asm __volatile("orl %1,%0"
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: "=m" (pcb->pcb_flags) : "ir" (flags), "m" (pcb->pcb_flags)
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: "cc");
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}
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static __inline void
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clear_pcb_flags(struct pcb *pcb, const u_int flags)
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{
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__asm __volatile("andl %1,%0"
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: "=m" (pcb->pcb_flags) : "ir" (~flags), "m" (pcb->pcb_flags)
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: "cc");
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}
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void makectx(struct trapframe *, struct pcb *);
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int savectx(struct pcb *);
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#endif
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#endif /* _AMD64_PCB_H_ */
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