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freebsd-dev/sys/amd64/include/pcb.h

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Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00
/*-
sys: further adoption of SPDX licensing ID tags. Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
2017-11-20 19:43:44 +00:00
* SPDX-License-Identifier: BSD-3-Clause
*
Update the graffiti.
2003-11-08 04:39:22 +00:00
* Copyright (c) 2003 Peter Wemm.
Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
Renumber copyright clause 4 Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
2017-02-28 23:42:47 +00:00
* 3. Neither the name of the University nor the names of its contributors
Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
All: Remove patch kit headers, and add $Id$ This is mostly to align some more code with NetBSD. cpu.h: Remove the old function vs. include configuration stuff that was ifdefed out when we went to inline functions. Remove the define of resettodr that made it a nop, there is already a function that makes it a nop, no need to #define one. Remove the #defines of processor types, they are now defined in cputypes.h, #include that file. Add struct cpu_nameclass for support of cpu types. frame.h: include sys/signal.h, it will be needed in the future. put the sigframe structure here that was in machdep.c pcb.h: Add multiple inclusion protection. Add pcb_ldt and pcb_ldt_len to pcb structure, this is for the user mode ldt.
1993-10-08 20:51:00 +00:00
* from: @(#)pcb.h 5.10 (Berkeley) 5/12/91
$Id$ -> $FreeBSD$
1999-08-28 01:08:13 +00:00
* $FreeBSD$
Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00
*/
Update the graffiti.
2003-11-08 04:39:22 +00:00
#ifndef _AMD64_PCB_H_
#define _AMD64_PCB_H_
All: Remove patch kit headers, and add $Id$ This is mostly to align some more code with NetBSD. cpu.h: Remove the old function vs. include configuration stuff that was ifdefed out when we went to inline functions. Remove the define of resettodr that made it a nop, there is already a function that makes it a nop, no need to #define one. Remove the #defines of processor types, they are now defined in cputypes.h, #include that file. Add struct cpu_nameclass for support of cpu types. frame.h: include sys/signal.h, it will be needed in the future. put the sigframe structure here that was in machdep.c pcb.h: Add multiple inclusion protection. Add pcb_ldt and pcb_ldt_len to pcb structure, this is for the user mode ldt.
1993-10-08 20:51:00 +00:00
Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00
/*
Rename npx* to fpu*. I haven't done the flags/function names yet.
2003-11-08 02:39:46 +00:00
* AMD64 process control block
Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00
*/
Rename npx* to fpu*. I haven't done the flags/function names yet.
2003-11-08 02:39:46 +00:00
#include <machine/fpu.h>
MFP4: Linux set_thread_area syscall (aka TLS) support for amd64. Initial version was submitted by Divacky Roman and mostly rewritten by me. Tested by: emulation
2007-03-30 00:06:21 +00:00
#include <machine/segments.h>
Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00
Hide struct pcb definition by #ifdef __amd64__ braces. If cc -m32 compilation results in inclusion of the header, a confict arises due to savefpu being union for i386, but used as struct in the pcb definition. The 32bit code should not need amd64 variant of the struct pcb anyway. For struct region_descriptor, use __uint64_t instead of unsigned long, as the base type for bit-fields. Unsigned long cannot have width 64 for -m32. The changes allowed to use sys/sysctl.h for cc -m32. Sponsored by: The FreeBSD Foundation MFC after: 1 week
2013-11-26 19:38:42 +00:00
#ifdef __amd64__
Export various helper variables describing the layout and size of certain kernel structures for use by debuggers. This mostly aids in examining cores from a kernel without debug symbols as a debugger can infer these values if debug symbols are available. One set of variables describes the layout of 'struct linker_file' to walk the list of loaded kernel modules. A second set of variables describes the layout of 'struct proc' and 'struct thread' to walk the list of processes in the kernel and the threads in each process. The 'pcb_size' variable is used to index into the stoppcbs[] array. The 'vm_maxuser_address' is used to distinguish kernel virtual addresses from user addresses. This doesn't have to be perfect, and 'vm_maxuser_address' is a cheap and simple way to differentiate kernel pointers from simple values like TIDs and PIDs. While here, annotate the fields in struct pcb used by kgdb on amd64 and i386 to note that their ABI should be preserved. Annotations for other platforms will be added in the future. Reviewed by: kib MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D3773
2015-11-12 22:00:59 +00:00
/*
* NB: The fields marked with (*) are used by kernel debuggers. Their
* ABI should be preserved.
*/
Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00
struct pcb {
Export various helper variables describing the layout and size of certain kernel structures for use by debuggers. This mostly aids in examining cores from a kernel without debug symbols as a debugger can infer these values if debug symbols are available. One set of variables describes the layout of 'struct linker_file' to walk the list of loaded kernel modules. A second set of variables describes the layout of 'struct proc' and 'struct thread' to walk the list of processes in the kernel and the threads in each process. The 'pcb_size' variable is used to index into the stoppcbs[] array. The 'vm_maxuser_address' is used to distinguish kernel virtual addresses from user addresses. This doesn't have to be perfect, and 'vm_maxuser_address' is a cheap and simple way to differentiate kernel pointers from simple values like TIDs and PIDs. While here, annotate the fields in struct pcb used by kgdb on amd64 and i386 to note that their ABI should be preserved. Annotations for other platforms will be added in the future. Reviewed by: kib MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D3773
2015-11-12 22:00:59 +00:00
register_t pcb_r15; /* (*) */
register_t pcb_r14; /* (*) */
register_t pcb_r13; /* (*) */
register_t pcb_r12; /* (*) */
register_t pcb_rbp; /* (*) */
register_t pcb_rsp; /* (*) */
register_t pcb_rbx; /* (*) */
register_t pcb_rip; /* (*) */
Give a %fs and %gs to userland. Use swapgs to obtain the kernel %GS.base value on entry and exit. This isn't as easy as it sounds because when we recursively trap or interrupt, we have to avoid duplicating the swapgs instruction or we end up back with the userland %gs. I implemented this by testing TF_CS to see if we're coming from supervisor mode already, and check for returning to supervisor. To avoid a race with interrupts in the brief period after beginning executing the handler and before the swapgs, convert all trap gates to interrupt gates, and reenable interrupts immediately after the swapgs. I am not happy with this. There are other possible ways to do this that should be investigated. (eg: storing the GS.base MSR value in the trapframe) Add some sysarch functions to let the userland code get to this. Approved by: re (blanket amd64/*)
2003-05-12 02:37:29 +00:00
register_t pcb_fsbase;
register_t pcb_gsbase;
- Merge savectx2() with savectx() and struct xpcb with struct pcb. [1] savectx() is only used for panic dump (dumppcb) and kdb (stoppcbs). Thus, saving additional information does not hurt and it may be even beneficial. Unfortunately, struct pcb has grown larger to accommodate more data. Move 512-byte long pcb_user_save to the end of struct pcb while I am here. - savectx() now saves FPU state unconditionally and copy it to the PCB of FPU thread if necessary. This gives panic dump and kdb a chance to take a look at the current FPU state even if the FPU is "supposedly" not used. - Resuming CPU now unconditionally reinitializes FPU. If the saved FPU state was irrelevant, it could be in an unknown state. Suggested by: bde [1]
2010-08-02 17:35:00 +00:00
register_t pcb_kgsbase;
register_t pcb_cr0;
register_t pcb_cr2;
register_t pcb_cr3;
register_t pcb_cr4;
register_t pcb_dr0;
register_t pcb_dr1;
register_t pcb_dr2;
register_t pcb_dr3;
register_t pcb_dr6;
register_t pcb_dr7;
Implement support for hardware debug registers on the i386. Submitted by: Brian Dean <brdean@unx.sas.com>
1999-07-09 04:16:00 +00:00
Improve PCB flags handling and make it more robust. Add two new functions for manipulating pcb_flags. These inline functions are very similar to atomic_set_char(9) and atomic_clear_char(9) but without unnecessary LOCK prefix for SMP. Add comments about the rationale[1]. Use these functions wherever possible. Although there are some places where it is not strictly necessary (e.g., a PCB is copied to create a new PCB), it is done across the board for sake of consistency. Turn pcb_full_iret into a PCB flag as it is safe now. Move rarely used fields before pcb_flags and reduce size of pcb_flags to one byte. Fix some style(9) nits in pcb.h while I am in the neighborhood. Reviewed by: kib Submitted by: kib[1] MFC after: 2 months
2010-12-22 00:18:42 +00:00
struct region_descriptor pcb_gdt;
struct region_descriptor pcb_idt;
struct region_descriptor pcb_ldt;
uint16_t pcb_tr;
Increase size of pcb_flags to four bytes. Requested by: bde, jhb
2010-12-22 19:57:03 +00:00
u_int pcb_flags;
Improve PCB flags handling and make it more robust. Add two new functions for manipulating pcb_flags. These inline functions are very similar to atomic_set_char(9) and atomic_clear_char(9) but without unnecessary LOCK prefix for SMP. Add comments about the rationale[1]. Use these functions wherever possible. Although there are some places where it is not strictly necessary (e.g., a PCB is copied to create a new PCB), it is done across the board for sake of consistency. Turn pcb_full_iret into a PCB flag as it is safe now. Move rarely used fields before pcb_flags and reduce size of pcb_flags to one byte. Fix some style(9) nits in pcb.h while I am in the neighborhood. Reviewed by: kib Submitted by: kib[1] MFC after: 2 months
2010-12-22 00:18:42 +00:00
#define PCB_FULL_IRET 0x01 /* full iret is required */
Rearrange struct pcb. r177532 (CVS r1.64 of pcb.h) moved pcb_flags to make better use of cache lines by placing it before pcb_save (now pcb_user_save), which is moved to the end of pcb since r210777.
2010-08-02 18:12:30 +00:00
#define PCB_DBREGS 0x02 /* process using debug registers */
#define PCB_KERNFPU 0x04 /* kernel uses fpu */
#define PCB_FPUINITDONE 0x08 /* fpu state is initialized */
#define PCB_USERFPUINITDONE 0x10 /* fpu user state is initialized */
#define PCB_32BIT 0x40 /* process has 32 bit context (segs etc) */
Add FPU_KERN_NOCTX flag to the fpu_kern_enter() function on amd64. The flag specifies that the block which uses FPU must be executed in critical section, i.e. take no context switches, and does not need an FPU save area during the execution. It is intended to be applied around fast and short code pathes where save area allocation is impossible or undesirable, due to context or due to the relative cost of calculation vs. allocation. Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
2016-09-11 09:14:07 +00:00
#define PCB_FPUNOSAVE 0x80 /* no save area for current FPU ctx */
Rearrange struct pcb. r177532 (CVS r1.64 of pcb.h) moved pcb_flags to make better use of cache lines by placing it before pcb_save (now pcb_user_save), which is moved to the end of pcb since r210777.
2010-08-02 18:12:30 +00:00
A better fix for handling different FPU initial control words for different ABIs: - Store the FPU initial control word in the pcb for each thread. - When first using the FPU, load the initial control word after restoring the clean state if it is not the standard control word. - Provide a correct control word for Linux/i386 binaries under FreeBSD/amd64. - Adjust the control word returned for fpugetregs()/npxgetregs() when a thread hasn't used the FPU yet to reflect the real initial control word for the current ABI. - The Linux/i386 ABI for FreeBSD/i386 now properly sets the right control word instead of trashing whatever the current state of the FPU is. Reviewed by: bde
2009-03-05 19:42:11 +00:00
uint16_t pcb_initial_fpucw;
1.Fix smp race between kernel vm86 BIOS calling and userland vm86 mode code, remove global variable in_vm86call, set vm86 calling flag in PCB flags. 2.Fix vm86 BIOS calling preempted problem by changing vm86_lock mutex type from MTX_DEF to MTX_SPIN. vm86pcb is not remembered in thread struct, when the thread calling vm86 BIOS is preempted by interrupt thread, and later switching back to the thread would cause incorrect context be loaded into CPU registers, this leads to kernel crash.
2002-11-07 01:34:23 +00:00
Improve PCB flags handling and make it more robust. Add two new functions for manipulating pcb_flags. These inline functions are very similar to atomic_set_char(9) and atomic_clear_char(9) but without unnecessary LOCK prefix for SMP. Add comments about the rationale[1]. Use these functions wherever possible. Although there are some places where it is not strictly necessary (e.g., a PCB is copied to create a new PCB), it is done across the board for sake of consistency. Turn pcb_full_iret into a PCB flag as it is safe now. Move rarely used fields before pcb_flags and reduce size of pcb_flags to one byte. Fix some style(9) nits in pcb.h while I am in the neighborhood. Reviewed by: kib Submitted by: kib[1] MFC after: 2 months
2010-12-22 00:18:42 +00:00
/* copyin/out fault recovery */
caddr_t pcb_onfault;
MFP4: Linux set_thread_area syscall (aka TLS) support for amd64. Initial version was submitted by Divacky Roman and mostly rewritten by me. Tested by: emulation
2007-03-30 00:06:21 +00:00
PTI: Trap if we returned to userspace with kernel (full) page table still active. Map userspace portion of VA in the PTI kernel-mode page table as non-executable. This way, if we ever miss reloading ucr3 into %cr3 on the return to usermode, the process traps instead of executing in potentially vulnerable setup. Catch the condition of such trap and verify user-mode %cr3, which is saved by page fault handler. I peek this trick in some article about Linux implementation. Reviewed by: alc, markj (previous version) Sponsored by: The FreeBSD Foundation MFC after: 12 days DIfferential revision: https://reviews.freebsd.org/D13956
2018-01-19 22:10:29 +00:00
uint64_t pcb_saved_ucr3;
Improve PCB flags handling and make it more robust. Add two new functions for manipulating pcb_flags. These inline functions are very similar to atomic_set_char(9) and atomic_clear_char(9) but without unnecessary LOCK prefix for SMP. Add comments about the rationale[1]. Use these functions wherever possible. Although there are some places where it is not strictly necessary (e.g., a PCB is copied to create a new PCB), it is done across the board for sake of consistency. Turn pcb_full_iret into a PCB flag as it is safe now. Move rarely used fields before pcb_flags and reduce size of pcb_flags to one byte. Fix some style(9) nits in pcb.h while I am in the neighborhood. Reviewed by: kib Submitted by: kib[1] MFC after: 2 months
2010-12-22 00:18:42 +00:00
Save and restore segment registers on amd64 when entering and leaving 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
2009-04-01 13:09:26 +00:00
/* local tss, with i/o bitmap; NULL for common */
struct amd64tss *pcb_tssp;
Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00
Add x86/acpica/acpi_wakeup.c for amd64 and i386. Difference of suspend/resume procedures are minimized among them. common: - Add global cpuset suspended_cpus to indicate APs are suspended/resumed. - Remove acpi_waketag and acpi_wakemap from acpivar.h (no longer used). - Add some variables in acpi_wakecode.S in order to minimize the difference among amd64 and i386. - Disable load_cr3() because now CR3 is restored in resumectx(). amd64: - Add suspend/resume related members (such as MSR) in PCB. - Modify savectx() for above new PCB members. - Merge acpi_switch.S into cpu_switch.S as resumectx(). i386: - Merge(and remove) suspendctx() into savectx() in order to match with amd64 code. Reviewed by: attilio@, acpi@
2012-06-09 00:37:26 +00:00
/* model specific registers */
register_t pcb_efer;
register_t pcb_star;
register_t pcb_lstar;
register_t pcb_cstar;
register_t pcb_sfmask;
Improve PCB flags handling and make it more robust. Add two new functions for manipulating pcb_flags. These inline functions are very similar to atomic_set_char(9) and atomic_clear_char(9) but without unnecessary LOCK prefix for SMP. Add comments about the rationale[1]. Use these functions wherever possible. Although there are some places where it is not strictly necessary (e.g., a PCB is copied to create a new PCB), it is done across the board for sake of consistency. Turn pcb_full_iret into a PCB flag as it is safe now. Move rarely used fields before pcb_flags and reduce size of pcb_flags to one byte. Fix some style(9) nits in pcb.h while I am in the neighborhood. Reviewed by: kib Submitted by: kib[1] MFC after: 2 months
2010-12-22 00:18:42 +00:00
struct savefpu *pcb_save;
Add support for the extended FPU states on amd64, both for native 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
2012-01-21 17:45:27 +00:00
Create a separate structure for per-CPU state saved across suspend and resume that is a superset of a pcb. Move the FPU state out of the pcb and into this new structure. As part of this, move the FPU resume code on amd64 into a C function. This allows resumectx() to still operate only on a pcb and more closely mirrors the i386 code. Reviewed by: kib (earlier version)
2014-09-06 15:23:28 +00:00
uint64_t pcb_pad[5];
};
/* Per-CPU state saved during suspend and resume. */
struct susppcb {
struct pcb sp_pcb;
/* fpu context for suspend/resume */
void *sp_fpususpend;
Initial suspend/resume support for amd64. This code is heavily inspired by Takanori Watanabe's experimental SMP patch for i386 and large portion was shamelessly cut and pasted from Peter Wemm's AP boot code.
2009-03-17 00:48:11 +00:00
};
Provide dummy definition of the amd64 struct pcb for -m32 compilation. I do not see a need in the proper x86/include/pcb.h header. Reported and tested by: antoine MFC after: 1 week
2019-10-26 18:22:52 +00:00
#else /* 32bit */
struct pcb {
uint64_t pcb_dummy[40];
};
Hide struct pcb definition by #ifdef __amd64__ braces. If cc -m32 compilation results in inclusion of the header, a confict arises due to savefpu being union for i386, but used as struct in the pcb definition. The 32bit code should not need amd64 variant of the struct pcb anyway. For struct region_descriptor, use __uint64_t instead of unsigned long, as the base type for bit-fields. Unsigned long cannot have width 64 for -m32. The changes allowed to use sys/sysctl.h for cc -m32. Sponsored by: The FreeBSD Foundation MFC after: 1 week
2013-11-26 19:38:42 +00:00
#endif
Initial suspend/resume support for amd64. This code is heavily inspired by Takanori Watanabe's experimental SMP patch for i386 and large portion was shamelessly cut and pasted from Peter Wemm's AP boot code.
2009-03-17 00:48:11 +00:00
Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL" is an application space macro and the applications are supposed to be free to use it as they please (but cannot). This is consistant with the other BSD's who made this change quite some time ago. More commits to come.
1999-12-29 04:46:21 +00:00
#ifdef _KERNEL
Implement makectx(). The makectx() function is used by KDB to create a PCB from a trapframe for purposes of unwinding the stack. The PCB is used as the thread context and all but the thread that entered the debugger has a valid PCB. This function can also be used to create a context for the threads running on the CPUs that have been stopped when the debugger got entered. This however is not done at the time of this commit.
2004-07-10 19:56:00 +00:00
struct trapframe;
Make WRFSBASE and WRGSBASE instructions functional. Right now, we enable the CR4.FSGSBASE bit on CPUs which support the facility (Ivy and later), to allow usermode to read fs and gs bases without syscalls. This bit also controls the write access to bases from userspace, but WRFSBASE and WRGSBASE instructions currently cannot be used, because return path from both exceptions or interrupts overrides bases with the values from pcb. Supporting the instructions is useful because this means that usermode can implement green-threads completely in userspace without issuing syscalls to change all of the machine context. Support is implemented by saving the fs base and user gs base when PCB_FULL_IRET flag is set. The flag is set on the context switch, which potentially causes clobber of the bases due to activation of another context, and when explicit modification of the user context by a syscall or exception handler is performed. In particular, the patch moves setting of the flag before syscalls change context. The changes to doreti_exit and PUSH_FRAME to clear PCB_FULL_IRET on entry from userspace can be considered a bug fixes on its own. Reviewed by: jhb (previous version) Tested by: pho (previous version) Sponsored by: The FreeBSD Foundation MFC after: 3 weeks Differential revision: https://reviews.freebsd.org/D12023
2017-08-21 17:38:02 +00:00
void clear_pcb_flags(struct pcb *pcb, const u_int flags);
Implement makectx(). The makectx() function is used by KDB to create a PCB from a trapframe for purposes of unwinding the stack. The PCB is used as the thread context and all but the thread that entered the debugger has a valid PCB. This function can also be used to create a context for the threads running on the CPUs that have been stopped when the debugger got entered. This however is not done at the time of this commit.
2004-07-10 19:56:00 +00:00
void makectx(struct trapframe *, struct pcb *);
Make WRFSBASE and WRGSBASE instructions functional. Right now, we enable the CR4.FSGSBASE bit on CPUs which support the facility (Ivy and later), to allow usermode to read fs and gs bases without syscalls. This bit also controls the write access to bases from userspace, but WRFSBASE and WRGSBASE instructions currently cannot be used, because return path from both exceptions or interrupts overrides bases with the values from pcb. Supporting the instructions is useful because this means that usermode can implement green-threads completely in userspace without issuing syscalls to change all of the machine context. Support is implemented by saving the fs base and user gs base when PCB_FULL_IRET flag is set. The flag is set on the context switch, which potentially causes clobber of the bases due to activation of another context, and when explicit modification of the user context by a syscall or exception handler is performed. In particular, the patch moves setting of the flag before syscalls change context. The changes to doreti_exit and PUSH_FRAME to clear PCB_FULL_IRET on entry from userspace can be considered a bug fixes on its own. Reviewed by: jhb (previous version) Tested by: pho (previous version) Sponsored by: The FreeBSD Foundation MFC after: 3 weeks Differential revision: https://reviews.freebsd.org/D12023
2017-08-21 17:38:02 +00:00
void set_pcb_flags(struct pcb *pcb, const u_int flags);
void set_pcb_flags_raw(struct pcb *pcb, const u_int flags);
Add a convenience macro for the returns_twice attribute, and apply it to the prototypes of the appropriate functions (getcontext, savectx, setjmp, sigsetjmp and vfork). MFC after: 2 weeks
2012-04-29 11:04:31 +00:00
int savectx(struct pcb *) __returns_twice;
- Remove unused code for CR3 and CR4. - Fix few style(9) nits while I am here.
2012-06-13 22:53:56 +00:00
void resumectx(struct pcb *);
Add support for the extended FPU states on amd64, both for native 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
2012-01-21 17:45:27 +00:00
Make WRFSBASE and WRGSBASE instructions functional. Right now, we enable the CR4.FSGSBASE bit on CPUs which support the facility (Ivy and later), to allow usermode to read fs and gs bases without syscalls. This bit also controls the write access to bases from userspace, but WRFSBASE and WRGSBASE instructions currently cannot be used, because return path from both exceptions or interrupts overrides bases with the values from pcb. Supporting the instructions is useful because this means that usermode can implement green-threads completely in userspace without issuing syscalls to change all of the machine context. Support is implemented by saving the fs base and user gs base when PCB_FULL_IRET flag is set. The flag is set on the context switch, which potentially causes clobber of the bases due to activation of another context, and when explicit modification of the user context by a syscall or exception handler is performed. In particular, the patch moves setting of the flag before syscalls change context. The changes to doreti_exit and PUSH_FRAME to clear PCB_FULL_IRET on entry from userspace can be considered a bug fixes on its own. Reviewed by: jhb (previous version) Tested by: pho (previous version) Sponsored by: The FreeBSD Foundation MFC after: 3 weeks Differential revision: https://reviews.freebsd.org/D12023
2017-08-21 17:38:02 +00:00
/* Ensure that pcb_gsbase and pcb_fsbase are up to date */
#define update_pcb_bases(pcb) set_pcb_flags((pcb), PCB_FULL_IRET)
Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00
#endif
All: Remove patch kit headers, and add $Id$ This is mostly to align some more code with NetBSD. cpu.h: Remove the old function vs. include configuration stuff that was ifdefed out when we went to inline functions. Remove the define of resettodr that made it a nop, there is already a function that makes it a nop, no need to #define one. Remove the #defines of processor types, they are now defined in cputypes.h, #include that file. Add struct cpu_nameclass for support of cpu types. frame.h: include sys/signal.h, it will be needed in the future. put the sigframe structure here that was in machdep.c pcb.h: Add multiple inclusion protection. Add pcb_ldt and pcb_ldt_len to pcb structure, this is for the user mode ldt.
1993-10-08 20:51:00 +00:00
Update the graffiti.
2003-11-08 04:39:22 +00:00
#endif /* _AMD64_PCB_H_ */
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