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freebsd-dev/sys/compat/ia32/ia32_signal.h
Konstantin Belousov 8c6f8f3d5b 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

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/*-
* Copyright (c) 1999 Marcel Moolenaar
* Copyright (c) 2003 Peter Wemm
* All rights reserved.
*
* 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
* in this position and unchanged.
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* $FreeBSD$
*/
#ifndef _COMPAT_IA32_IA32_SIGNAL_H
#define _COMPAT_IA32_IA32_SIGNAL_H
#define _MC_IA32_HASSEGS 0x1
#define _MC_IA32_HASBASES 0x2
#define _MC_IA32_HASFPXSTATE 0x4
#define _MC_IA32_FLAG_MASK \
(_MC_IA32_HASSEGS | _MC_IA32_HASBASES | _MC_IA32_HASFPXSTATE)
struct ia32_mcontext {
u_int32_t mc_onstack; /* XXX - sigcontext compat. */
u_int32_t mc_gs; /* machine state (struct trapframe) */
u_int32_t mc_fs;
u_int32_t mc_es;
u_int32_t mc_ds;
u_int32_t mc_edi;
u_int32_t mc_esi;
u_int32_t mc_ebp;
u_int32_t mc_isp;
u_int32_t mc_ebx;
u_int32_t mc_edx;
u_int32_t mc_ecx;
u_int32_t mc_eax;
u_int32_t mc_trapno;
u_int32_t mc_err;
u_int32_t mc_eip;
u_int32_t mc_cs;
u_int32_t mc_eflags;
u_int32_t mc_esp;
u_int32_t mc_ss;
u_int32_t mc_len; /* sizeof(struct ia32_mcontext) */
/* We use the same values for fpformat and ownedfp */
u_int32_t mc_fpformat;
u_int32_t mc_ownedfp;
u_int32_t mc_flags;
/*
* See <i386/include/npx.h> for the internals of mc_fpstate[].
*/
u_int32_t mc_fpstate[128] __aligned(16);
u_int32_t mc_fsbase;
u_int32_t mc_gsbase;
u_int32_t mc_xfpustate;
u_int32_t mc_xfpustate_len;
u_int32_t mc_spare2[4];
};
struct ia32_ucontext {
sigset_t uc_sigmask;
struct ia32_mcontext uc_mcontext;
u_int32_t uc_link;
struct sigaltstack32 uc_stack;
u_int32_t uc_flags;
u_int32_t __spare__[4];
};
#if defined(COMPAT_FREEBSD4)
struct ia32_mcontext4 {
u_int32_t mc_onstack; /* XXX - sigcontext compat. */
u_int32_t mc_gs; /* machine state (struct trapframe) */
u_int32_t mc_fs;
u_int32_t mc_es;
u_int32_t mc_ds;
u_int32_t mc_edi;
u_int32_t mc_esi;
u_int32_t mc_ebp;
u_int32_t mc_isp;
u_int32_t mc_ebx;
u_int32_t mc_edx;
u_int32_t mc_ecx;
u_int32_t mc_eax;
u_int32_t mc_trapno;
u_int32_t mc_err;
u_int32_t mc_eip;
u_int32_t mc_cs;
u_int32_t mc_eflags;
u_int32_t mc_esp;
u_int32_t mc_ss;
u_int32_t mc_fpregs[28];
u_int32_t __spare__[17];
};
struct ia32_ucontext4 {
sigset_t uc_sigmask;
struct ia32_mcontext4 uc_mcontext;
u_int32_t uc_link;
struct sigaltstack32 uc_stack;
u_int32_t __spare__[8];
};
#endif
#ifdef COMPAT_43
struct ia32_sigcontext3 {
u_int32_t sc_onstack;
u_int32_t sc_mask;
u_int32_t sc_esp;
u_int32_t sc_ebp;
u_int32_t sc_isp;
u_int32_t sc_eip;
u_int32_t sc_eflags;
u_int32_t sc_es;
u_int32_t sc_ds;
u_int32_t sc_cs;
u_int32_t sc_ss;
u_int32_t sc_edi;
u_int32_t sc_esi;
u_int32_t sc_ebx;
u_int32_t sc_edx;
u_int32_t sc_ecx;
u_int32_t sc_eax;
u_int32_t sc_gs;
u_int32_t sc_fs;
u_int32_t sc_trapno;
u_int32_t sc_err;
};
#endif
/*
* Signal frames, arguments passed to application signal handlers.
*/
#ifdef COMPAT_FREEBSD4
struct ia32_sigframe4 {
u_int32_t sf_signum;
u_int32_t sf_siginfo; /* code or pointer to sf_si */
u_int32_t sf_ucontext; /* points to sf_uc */
u_int32_t sf_addr; /* undocumented 4th arg */
u_int32_t sf_ah; /* action/handler pointer */
struct ia32_ucontext4 sf_uc; /* = *sf_ucontext */
struct siginfo32 sf_si; /* = *sf_siginfo (SA_SIGINFO case) */
};
#endif
struct ia32_sigframe {
u_int32_t sf_signum;
u_int32_t sf_siginfo; /* code or pointer to sf_si */
u_int32_t sf_ucontext; /* points to sf_uc */
u_int32_t sf_addr; /* undocumented 4th arg */
u_int32_t sf_ah; /* action/handler pointer */
/* Beware, hole due to ucontext being 16 byte aligned! */
struct ia32_ucontext sf_uc; /* = *sf_ucontext */
struct siginfo32 sf_si; /* = *sf_siginfo (SA_SIGINFO case) */
};
#ifdef COMPAT_43
struct ia32_siginfo3 {
struct ia32_sigcontext3 si_sc;
int si_signo;
int si_code;
union sigval32 si_value;
};
struct ia32_sigframe3 {
int sf_signum;
u_int32_t sf_arg2; /* int or siginfo_t */
u_int32_t sf_scp;
u_int32_t sf_addr;
u_int32_t sf_ah; /* action/handler pointer */
struct ia32_siginfo3 sf_siginfo;
};
#endif
struct ksiginfo;
struct image_params;
extern char ia32_sigcode[];
extern char freebsd4_ia32_sigcode[];
extern char ia32_osigcode[];
extern char lcall_tramp;
extern int sz_ia32_sigcode;
extern int sz_freebsd4_ia32_sigcode;
extern int sz_ia32_osigcode;
extern int sz_lcall_tramp;
void ia32_sendsig(sig_t, struct ksiginfo *, sigset_t *);
void ia32_setregs(struct thread *td, struct image_params *imgp,
u_long stack);
int setup_lcall_gate(void);
#endif
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