59838c1a19
Modern debuggers and process tracers use ptrace() rather than procfs for debugging. ptrace() has a supserset of functionality available via procfs and new debugging features are only added to ptrace(). While the two debugging services share some fields in struct proc, they each use dedicated fields and separate code. This results in extra complexity to support a feature that hasn't been enabled in the default install for several years. PR: 244939 (exp-run) Reviewed by: kib, mjg (earlier version) Relnotes: yes Differential Revision: https://reviews.freebsd.org/D23837
241 lines
6.3 KiB
C
241 lines
6.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2005 Peter Wemm
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* 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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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/exec.h>
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#include <sys/fcntl.h>
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#include <sys/imgact.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/mman.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/procfs.h>
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#include <sys/resourcevar.h>
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#include <sys/systm.h>
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#include <sys/signalvar.h>
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#include <sys/stat.h>
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#include <sys/sx.h>
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#include <sys/syscall.h>
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#include <sys/sysctl.h>
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#include <sys/sysent.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <vm/vm_extern.h>
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#include <compat/freebsd32/freebsd32_util.h>
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#include <compat/freebsd32/freebsd32_proto.h>
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#include <machine/fpu.h>
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#include <machine/psl.h>
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#include <machine/segments.h>
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#include <machine/specialreg.h>
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#include <machine/frame.h>
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#include <machine/md_var.h>
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#include <machine/pcb.h>
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#include <machine/cpufunc.h>
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#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
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#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
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int
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fill_regs32(struct thread *td, struct reg32 *regs)
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{
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struct trapframe *tp;
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tp = td->td_frame;
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if (tp->tf_flags & TF_HASSEGS) {
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regs->r_gs = tp->tf_gs;
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regs->r_fs = tp->tf_fs;
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regs->r_es = tp->tf_es;
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regs->r_ds = tp->tf_ds;
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} else {
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regs->r_gs = _ugssel;
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regs->r_fs = _ufssel;
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regs->r_es = _udatasel;
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regs->r_ds = _udatasel;
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}
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regs->r_edi = tp->tf_rdi;
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regs->r_esi = tp->tf_rsi;
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regs->r_ebp = tp->tf_rbp;
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regs->r_ebx = tp->tf_rbx;
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regs->r_edx = tp->tf_rdx;
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regs->r_ecx = tp->tf_rcx;
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regs->r_eax = tp->tf_rax;
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regs->r_eip = tp->tf_rip;
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regs->r_cs = tp->tf_cs;
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regs->r_eflags = tp->tf_rflags;
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regs->r_esp = tp->tf_rsp;
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regs->r_ss = tp->tf_ss;
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regs->r_err = 0;
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regs->r_trapno = 0;
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return (0);
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}
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int
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set_regs32(struct thread *td, struct reg32 *regs)
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{
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struct trapframe *tp;
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tp = td->td_frame;
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if (!EFL_SECURE(regs->r_eflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs))
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return (EINVAL);
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tp->tf_gs = regs->r_gs;
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tp->tf_fs = regs->r_fs;
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tp->tf_es = regs->r_es;
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tp->tf_ds = regs->r_ds;
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set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
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tp->tf_flags = TF_HASSEGS;
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tp->tf_rdi = regs->r_edi;
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tp->tf_rsi = regs->r_esi;
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tp->tf_rbp = regs->r_ebp;
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tp->tf_rbx = regs->r_ebx;
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tp->tf_rdx = regs->r_edx;
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tp->tf_rcx = regs->r_ecx;
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tp->tf_rax = regs->r_eax;
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tp->tf_rip = regs->r_eip;
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tp->tf_cs = regs->r_cs;
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tp->tf_rflags = regs->r_eflags;
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tp->tf_rsp = regs->r_esp;
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tp->tf_ss = regs->r_ss;
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return (0);
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}
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int
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fill_fpregs32(struct thread *td, struct fpreg32 *regs)
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{
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struct savefpu *sv_fpu;
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struct save87 *sv_87;
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struct env87 *penv_87;
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struct envxmm *penv_xmm;
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int i;
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bzero(regs, sizeof(*regs));
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sv_87 = (struct save87 *)regs;
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penv_87 = &sv_87->sv_env;
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fpugetregs(td);
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sv_fpu = get_pcb_user_save_td(td);
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penv_xmm = &sv_fpu->sv_env;
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/* FPU control/status */
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penv_87->en_cw = penv_xmm->en_cw;
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penv_87->en_sw = penv_xmm->en_sw;
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/*
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* XXX for en_fip/fcs/foo/fos, check if the fxsave format
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* uses the old-style layout for 32 bit user apps. If so,
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* read the ip and operand segment registers from there.
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* For now, use the process's %cs/%ds.
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*/
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penv_87->en_fip = penv_xmm->en_rip;
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penv_87->en_fcs = td->td_frame->tf_cs;
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penv_87->en_opcode = penv_xmm->en_opcode;
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penv_87->en_foo = penv_xmm->en_rdp;
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/* Entry into the kernel always sets TF_HASSEGS */
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penv_87->en_fos = td->td_frame->tf_ds;
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/* FPU registers and tags */
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penv_87->en_tw = 0xffff;
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for (i = 0; i < 8; ++i) {
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sv_87->sv_ac[i] = sv_fpu->sv_fp[i].fp_acc;
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if ((penv_xmm->en_tw & (1 << i)) != 0)
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penv_87->en_tw &= ~(3 << i * 2);
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}
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return (0);
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}
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int
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set_fpregs32(struct thread *td, struct fpreg32 *regs)
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{
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struct save87 *sv_87 = (struct save87 *)regs;
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struct env87 *penv_87 = &sv_87->sv_env;
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struct savefpu *sv_fpu = get_pcb_user_save_td(td);
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struct envxmm *penv_xmm = &sv_fpu->sv_env;
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int i;
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/* FPU control/status */
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penv_xmm->en_cw = penv_87->en_cw;
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penv_xmm->en_sw = penv_87->en_sw;
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penv_xmm->en_rip = penv_87->en_fip;
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/* penv_87->en_fcs and en_fos ignored, see above */
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penv_xmm->en_opcode = penv_87->en_opcode;
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penv_xmm->en_rdp = penv_87->en_foo;
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/* FPU registers and tags */
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penv_xmm->en_tw = 0;
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for (i = 0; i < 8; ++i) {
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sv_fpu->sv_fp[i].fp_acc = sv_87->sv_ac[i];
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if ((penv_87->en_tw & (3 << i * 2)) != (3 << i * 2))
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penv_xmm->en_tw |= 1 << i;
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}
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for (i = 8; i < 16; ++i)
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bzero(&sv_fpu->sv_fp[i].fp_acc, sizeof(sv_fpu->sv_fp[i].fp_acc));
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fpuuserinited(td);
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return (0);
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}
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int
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fill_dbregs32(struct thread *td, struct dbreg32 *regs)
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{
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struct dbreg dr;
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int err, i;
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err = fill_dbregs(td, &dr);
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for (i = 0; i < 8; i++)
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regs->dr[i] = dr.dr[i];
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return (err);
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}
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int
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set_dbregs32(struct thread *td, struct dbreg32 *regs)
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{
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struct dbreg dr;
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int i;
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for (i = 0; i < 8; i++)
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dr.dr[i] = regs->dr[i];
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for (i = 8; i < 16; i++)
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dr.dr[i] = 0;
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return (set_dbregs(td, &dr));
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}
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