600 lines
18 KiB
C
600 lines
18 KiB
C
/*-
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* Copyright (c) 2003 Peter Wemm
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* Copyright (c) 1982, 1987, 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_compat.h"
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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/pioctl.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 <compat/ia32/ia32_signal.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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#ifdef COMPAT_FREEBSD4
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static void freebsd4_ia32_sendsig(sig_t, int, sigset_t *, u_long);
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#endif
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static void ia32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp);
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static int ia32_set_fpcontext(struct thread *td, const struct ia32_mcontext *mcp);
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extern int _ucode32sel, _udatasel;
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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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static void
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ia32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp)
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{
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struct savefpu *addr;
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/*
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* XXX mc_fpstate might be misaligned, since its declaration is not
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* unportabilized using __attribute__((aligned(16))) like the
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* declaration of struct savemm, and anyway, alignment doesn't work
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* for auto variables since we don't use gcc's pessimal stack
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* alignment. Work around this by abusing the spare fields after
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* mcp->mc_fpstate.
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*
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* XXX unpessimize most cases by only aligning when fxsave might be
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* called, although this requires knowing too much about
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* fpugetregs()'s internals.
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*/
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addr = (struct savefpu *)&mcp->mc_fpstate;
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if (td == PCPU_GET(fpcurthread) && ((uintptr_t)(void *)addr & 0xF)) {
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do
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addr = (void *)((char *)addr + 4);
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while ((uintptr_t)(void *)addr & 0xF);
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}
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mcp->mc_ownedfp = fpugetregs(td, addr);
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if (addr != (struct savefpu *)&mcp->mc_fpstate) {
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bcopy(addr, &mcp->mc_fpstate, sizeof(mcp->mc_fpstate));
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bzero(&mcp->mc_spare2, sizeof(mcp->mc_spare2));
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}
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mcp->mc_fpformat = fpuformat();
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}
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static int
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ia32_set_fpcontext(struct thread *td, const struct ia32_mcontext *mcp)
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{
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struct savefpu *addr;
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if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
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return (0);
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else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
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return (EINVAL);
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else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE)
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/* We don't care what state is left in the FPU or PCB. */
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fpstate_drop(td);
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else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
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mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
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/* XXX align as above. */
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addr = (struct savefpu *)&mcp->mc_fpstate;
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if (td == PCPU_GET(fpcurthread) &&
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((uintptr_t)(void *)addr & 0xF)) {
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do
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addr = (void *)((char *)addr + 4);
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while ((uintptr_t)(void *)addr & 0xF);
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bcopy(&mcp->mc_fpstate, addr, sizeof(mcp->mc_fpstate));
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}
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/*
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* XXX we violate the dubious requirement that fpusetregs()
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* be called with interrupts disabled.
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*/
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fpusetregs(td, addr);
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/*
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* Don't bother putting things back where they were in the
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* misaligned case, since we know that the caller won't use
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* them again.
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*/
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} else
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return (EINVAL);
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return (0);
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}
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/*
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* Send an interrupt to process.
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*
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* Stack is set up to allow sigcode stored
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* at top to call routine, followed by kcall
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* to sigreturn routine below. After sigreturn
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* resets the signal mask, the stack, and the
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* frame pointer, it returns to the user
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* specified pc, psl.
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*/
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#ifdef COMPAT_FREEBSD4
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static void
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freebsd4_ia32_sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
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{
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struct ia32_sigframe4 sf, *sfp;
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struct proc *p;
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struct thread *td;
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struct sigacts *psp;
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struct trapframe *regs;
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int oonstack;
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td = curthread;
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p = td->td_proc;
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PROC_LOCK_ASSERT(p, MA_OWNED);
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psp = p->p_sigacts;
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mtx_assert(&psp->ps_mtx, MA_OWNED);
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regs = td->td_frame;
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oonstack = sigonstack(regs->tf_rsp);
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/* Save user context. */
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bzero(&sf, sizeof(sf));
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sf.sf_uc.uc_sigmask = *mask;
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sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
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sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
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sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
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? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
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sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
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sf.sf_uc.uc_mcontext.mc_gs = rgs();
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sf.sf_uc.uc_mcontext.mc_fs = rfs();
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__asm __volatile("movl %%es,%0" : "=rm" (sf.sf_uc.uc_mcontext.mc_es));
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__asm __volatile("movl %%ds,%0" : "=rm" (sf.sf_uc.uc_mcontext.mc_ds));
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sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
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sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
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sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
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sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
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sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
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sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
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sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
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sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
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sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
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sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
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sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
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sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
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sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
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sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
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sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
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/* Allocate space for the signal handler context. */
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if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
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SIGISMEMBER(psp->ps_sigonstack, sig)) {
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sfp = (struct ia32_sigframe4 *)(td->td_sigstk.ss_sp +
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td->td_sigstk.ss_size - sizeof(sf));
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} else
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sfp = (struct ia32_sigframe4 *)regs->tf_rsp - 1;
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PROC_UNLOCK(p);
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/* Translate the signal if appropriate. */
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if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
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sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
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/* Build the argument list for the signal handler. */
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sf.sf_signum = sig;
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sf.sf_ucontext = (register_t)&sfp->sf_uc;
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if (SIGISMEMBER(psp->ps_siginfo, sig)) {
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/* Signal handler installed with SA_SIGINFO. */
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sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
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sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
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/* Fill in POSIX parts */
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sf.sf_si.si_signo = sig;
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sf.sf_si.si_code = code;
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sf.sf_si.si_addr = regs->tf_addr;
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} else {
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/* Old FreeBSD-style arguments. */
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sf.sf_siginfo = code;
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sf.sf_addr = regs->tf_addr;
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sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
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}
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mtx_unlock(&psp->ps_mtx);
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/*
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* Copy the sigframe out to the user's stack.
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*/
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if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
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#ifdef DEBUG
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printf("process %ld has trashed its stack\n", (long)p->p_pid);
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#endif
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PROC_LOCK(p);
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sigexit(td, SIGILL);
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}
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regs->tf_rsp = (uintptr_t)sfp;
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regs->tf_rip = FREEBSD32_PS_STRINGS - sz_freebsd4_ia32_sigcode;
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regs->tf_rflags &= ~PSL_T;
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regs->tf_cs = _ucode32sel;
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regs->tf_ss = _udatasel;
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load_ds(_udatasel);
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td->td_pcb->pcb_ds = _udatasel;
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load_es(_udatasel);
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td->td_pcb->pcb_es = _udatasel;
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/* leave user %fs and %gs untouched */
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PROC_LOCK(p);
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mtx_lock(&psp->ps_mtx);
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}
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#endif /* COMPAT_FREEBSD4 */
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void
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ia32_sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
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{
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struct ia32_sigframe sf, *sfp;
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struct proc *p;
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struct thread *td;
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struct sigacts *psp;
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char *sp;
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struct trapframe *regs;
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int oonstack;
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td = curthread;
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p = td->td_proc;
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PROC_LOCK_ASSERT(p, MA_OWNED);
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psp = p->p_sigacts;
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#ifdef COMPAT_FREEBSD4
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if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
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freebsd4_ia32_sendsig(catcher, sig, mask, code);
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return;
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}
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#endif
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mtx_assert(&psp->ps_mtx, MA_OWNED);
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regs = td->td_frame;
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oonstack = sigonstack(regs->tf_rsp);
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/* Save user context. */
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bzero(&sf, sizeof(sf));
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sf.sf_uc.uc_sigmask = *mask;
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sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
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sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
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sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
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? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
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sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
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sf.sf_uc.uc_mcontext.mc_gs = rgs();
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sf.sf_uc.uc_mcontext.mc_fs = rfs();
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__asm __volatile("movl %%es,%0" : "=rm" (sf.sf_uc.uc_mcontext.mc_es));
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__asm __volatile("movl %%ds,%0" : "=rm" (sf.sf_uc.uc_mcontext.mc_ds));
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sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
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sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
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sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
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sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
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sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
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sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
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sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
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sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
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sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
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sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
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sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
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sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
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sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
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sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
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sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
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sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
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ia32_get_fpcontext(td, &sf.sf_uc.uc_mcontext);
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fpstate_drop(td);
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/* Allocate space for the signal handler context. */
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if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
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SIGISMEMBER(psp->ps_sigonstack, sig)) {
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sp = td->td_sigstk.ss_sp +
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td->td_sigstk.ss_size - sizeof(sf);
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} else
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sp = (char *)regs->tf_rsp - sizeof(sf);
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/* Align to 16 bytes. */
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sfp = (struct ia32_sigframe *)((uintptr_t)sp & ~0xF);
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PROC_UNLOCK(p);
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/* Translate the signal if appropriate. */
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if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
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sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
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/* Build the argument list for the signal handler. */
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sf.sf_signum = sig;
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sf.sf_ucontext = (register_t)&sfp->sf_uc;
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if (SIGISMEMBER(psp->ps_siginfo, sig)) {
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/* Signal handler installed with SA_SIGINFO. */
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sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
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sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
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/* Fill in POSIX parts */
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sf.sf_si.si_signo = sig;
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sf.sf_si.si_code = code;
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sf.sf_si.si_addr = regs->tf_addr;
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} else {
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/* Old FreeBSD-style arguments. */
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sf.sf_siginfo = code;
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sf.sf_addr = regs->tf_addr;
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sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
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}
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mtx_unlock(&psp->ps_mtx);
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/*
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* Copy the sigframe out to the user's stack.
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*/
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if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
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#ifdef DEBUG
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printf("process %ld has trashed its stack\n", (long)p->p_pid);
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#endif
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PROC_LOCK(p);
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sigexit(td, SIGILL);
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}
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regs->tf_rsp = (uintptr_t)sfp;
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regs->tf_rip = FREEBSD32_PS_STRINGS - *(p->p_sysent->sv_szsigcode);
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regs->tf_rflags &= ~PSL_T;
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regs->tf_cs = _ucode32sel;
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regs->tf_ss = _udatasel;
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load_ds(_udatasel);
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td->td_pcb->pcb_ds = _udatasel;
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load_es(_udatasel);
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td->td_pcb->pcb_es = _udatasel;
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/* leave user %fs and %gs untouched */
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PROC_LOCK(p);
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mtx_lock(&psp->ps_mtx);
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}
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/*
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* System call to cleanup state after a signal
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* has been taken. Reset signal mask and
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* stack state from context left by sendsig (above).
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* Return to previous pc and psl as specified by
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* context left by sendsig. Check carefully to
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* make sure that the user has not modified the
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* state to gain improper privileges.
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*/
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#ifdef COMPAT_FREEBSD4
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/*
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* MPSAFE
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*/
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int
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freebsd4_freebsd32_sigreturn(td, uap)
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struct thread *td;
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struct freebsd4_freebsd32_sigreturn_args /* {
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const struct freebsd4_freebsd32_ucontext *sigcntxp;
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} */ *uap;
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{
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struct ia32_ucontext4 uc;
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struct proc *p = td->td_proc;
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struct trapframe *regs;
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const struct ia32_ucontext4 *ucp;
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int cs, eflags, error;
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error = copyin(uap->sigcntxp, &uc, sizeof(uc));
|
|
if (error != 0)
|
|
return (error);
|
|
ucp = &uc;
|
|
regs = td->td_frame;
|
|
eflags = ucp->uc_mcontext.mc_eflags;
|
|
/*
|
|
* Don't allow users to change privileged or reserved flags.
|
|
*/
|
|
/*
|
|
* XXX do allow users to change the privileged flag PSL_RF.
|
|
* The cpu sets PSL_RF in tf_eflags for faults. Debuggers
|
|
* should sometimes set it there too. tf_eflags is kept in
|
|
* the signal context during signal handling and there is no
|
|
* other place to remember it, so the PSL_RF bit may be
|
|
* corrupted by the signal handler without us knowing.
|
|
* Corruption of the PSL_RF bit at worst causes one more or
|
|
* one less debugger trap, so allowing it is fairly harmless.
|
|
*/
|
|
if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
|
|
printf("freebsd4_freebsd32_sigreturn: eflags = 0x%x\n", eflags);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Don't allow users to load a valid privileged %cs. Let the
|
|
* hardware check for invalid selectors, excess privilege in
|
|
* other selectors, invalid %eip's and invalid %esp's.
|
|
*/
|
|
cs = ucp->uc_mcontext.mc_cs;
|
|
if (!CS_SECURE(cs)) {
|
|
printf("freebsd4_sigreturn: cs = 0x%x\n", cs);
|
|
trapsignal(td, SIGBUS, T_PROTFLT);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/* Segment selectors restored by sigtramp.S */
|
|
regs->tf_rdi = ucp->uc_mcontext.mc_edi;
|
|
regs->tf_rsi = ucp->uc_mcontext.mc_esi;
|
|
regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
|
|
regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
|
|
regs->tf_rdx = ucp->uc_mcontext.mc_edx;
|
|
regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
|
|
regs->tf_rax = ucp->uc_mcontext.mc_eax;
|
|
regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
|
|
regs->tf_err = ucp->uc_mcontext.mc_err;
|
|
regs->tf_rip = ucp->uc_mcontext.mc_eip;
|
|
regs->tf_cs = cs;
|
|
regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
|
|
regs->tf_rsp = ucp->uc_mcontext.mc_esp;
|
|
regs->tf_ss = ucp->uc_mcontext.mc_ss;
|
|
|
|
PROC_LOCK(p);
|
|
td->td_sigmask = ucp->uc_sigmask;
|
|
SIG_CANTMASK(td->td_sigmask);
|
|
signotify(td);
|
|
PROC_UNLOCK(p);
|
|
return (EJUSTRETURN);
|
|
}
|
|
#endif /* COMPAT_FREEBSD4 */
|
|
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
freebsd32_sigreturn(td, uap)
|
|
struct thread *td;
|
|
struct freebsd32_sigreturn_args /* {
|
|
const struct freebsd32_ucontext *sigcntxp;
|
|
} */ *uap;
|
|
{
|
|
struct ia32_ucontext uc;
|
|
struct proc *p = td->td_proc;
|
|
struct trapframe *regs;
|
|
const struct ia32_ucontext *ucp;
|
|
int cs, eflags, error, ret;
|
|
|
|
error = copyin(uap->sigcntxp, &uc, sizeof(uc));
|
|
if (error != 0)
|
|
return (error);
|
|
ucp = &uc;
|
|
regs = td->td_frame;
|
|
eflags = ucp->uc_mcontext.mc_eflags;
|
|
/*
|
|
* Don't allow users to change privileged or reserved flags.
|
|
*/
|
|
/*
|
|
* XXX do allow users to change the privileged flag PSL_RF.
|
|
* The cpu sets PSL_RF in tf_eflags for faults. Debuggers
|
|
* should sometimes set it there too. tf_eflags is kept in
|
|
* the signal context during signal handling and there is no
|
|
* other place to remember it, so the PSL_RF bit may be
|
|
* corrupted by the signal handler without us knowing.
|
|
* Corruption of the PSL_RF bit at worst causes one more or
|
|
* one less debugger trap, so allowing it is fairly harmless.
|
|
*/
|
|
if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
|
|
printf("freebsd32_sigreturn: eflags = 0x%x\n", eflags);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Don't allow users to load a valid privileged %cs. Let the
|
|
* hardware check for invalid selectors, excess privilege in
|
|
* other selectors, invalid %eip's and invalid %esp's.
|
|
*/
|
|
cs = ucp->uc_mcontext.mc_cs;
|
|
if (!CS_SECURE(cs)) {
|
|
printf("sigreturn: cs = 0x%x\n", cs);
|
|
trapsignal(td, SIGBUS, T_PROTFLT);
|
|
return (EINVAL);
|
|
}
|
|
|
|
ret = ia32_set_fpcontext(td, &ucp->uc_mcontext);
|
|
if (ret != 0)
|
|
return (ret);
|
|
|
|
/* Segment selectors restored by sigtramp.S */
|
|
regs->tf_rdi = ucp->uc_mcontext.mc_edi;
|
|
regs->tf_rsi = ucp->uc_mcontext.mc_esi;
|
|
regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
|
|
regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
|
|
regs->tf_rdx = ucp->uc_mcontext.mc_edx;
|
|
regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
|
|
regs->tf_rax = ucp->uc_mcontext.mc_eax;
|
|
regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
|
|
regs->tf_err = ucp->uc_mcontext.mc_err;
|
|
regs->tf_rip = ucp->uc_mcontext.mc_eip;
|
|
regs->tf_cs = cs;
|
|
regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
|
|
regs->tf_rsp = ucp->uc_mcontext.mc_esp;
|
|
regs->tf_ss = ucp->uc_mcontext.mc_ss;
|
|
|
|
PROC_LOCK(p);
|
|
td->td_sigmask = ucp->uc_sigmask;
|
|
SIG_CANTMASK(td->td_sigmask);
|
|
signotify(td);
|
|
PROC_UNLOCK(p);
|
|
return (EJUSTRETURN);
|
|
}
|
|
|
|
/*
|
|
* Clear registers on exec
|
|
*/
|
|
void
|
|
ia32_setregs(td, entry, stack, ps_strings)
|
|
struct thread *td;
|
|
u_long entry;
|
|
u_long stack;
|
|
u_long ps_strings;
|
|
{
|
|
struct trapframe *regs = td->td_frame;
|
|
struct pcb *pcb = td->td_pcb;
|
|
|
|
wrmsr(MSR_FSBASE, 0);
|
|
wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */
|
|
pcb->pcb_fsbase = 0;
|
|
pcb->pcb_gsbase = 0;
|
|
load_ds(_udatasel);
|
|
load_es(_udatasel);
|
|
load_fs(_udatasel);
|
|
load_gs(_udatasel);
|
|
pcb->pcb_ds = _udatasel;
|
|
pcb->pcb_es = _udatasel;
|
|
pcb->pcb_fs = _udatasel;
|
|
pcb->pcb_gs = _udatasel;
|
|
|
|
bzero((char *)regs, sizeof(struct trapframe));
|
|
regs->tf_rip = entry;
|
|
regs->tf_rsp = stack;
|
|
regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
|
|
regs->tf_ss = _udatasel;
|
|
regs->tf_cs = _ucode32sel;
|
|
regs->tf_rbx = ps_strings;
|
|
load_cr0(rcr0() | CR0_MP | CR0_TS);
|
|
fpstate_drop(td);
|
|
|
|
/* Return via doreti so that we can change to a different %cs */
|
|
pcb->pcb_flags |= PCB_FULLCTX;
|
|
td->td_retval[1] = 0;
|
|
}
|