eaa828d3a5
Tested by: dim, pgj Sponsored by: The FreeBSD Foundation MFC after: 1 week
1005 lines
29 KiB
C
1005 lines
29 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/syscallsubr.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_signal.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/freebsd32/freebsd32.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, ksiginfo_t *, sigset_t *);
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#endif
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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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char *xfpusave, size_t xfpusave_len)
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{
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size_t max_len, len;
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/*
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* XXX Format of 64bit and 32bit FXSAVE areas differs. FXSAVE
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* in 32bit mode saves %cs and %ds, while on 64bit it saves
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* 64bit instruction and data pointers. Ignore the difference
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* for now, it should be irrelevant for most applications.
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*/
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mcp->mc_ownedfp = fpugetregs(td);
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bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0],
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sizeof(mcp->mc_fpstate));
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mcp->mc_fpformat = fpuformat();
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if (!use_xsave || xfpusave_len == 0)
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return;
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max_len = cpu_max_ext_state_size - sizeof(struct savefpu);
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len = xfpusave_len;
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if (len > max_len) {
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len = max_len;
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bzero(xfpusave + max_len, len - max_len);
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}
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mcp->mc_flags |= _MC_IA32_HASFPXSTATE;
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mcp->mc_xfpustate_len = len;
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bcopy(get_pcb_user_save_td(td) + 1, xfpusave, len);
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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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char *xfpustate, size_t xfpustate_len)
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{
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int error;
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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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error = 0;
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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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error = fpusetregs(td, (struct savefpu *)&mcp->mc_fpstate,
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xfpustate, xfpustate_len);
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} else
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return (EINVAL);
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return (error);
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}
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/*
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* Get machine context.
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*/
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static int
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ia32_get_mcontext(struct thread *td, struct ia32_mcontext *mcp, int flags)
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{
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struct pcb *pcb;
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struct trapframe *tp;
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pcb = td->td_pcb;
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tp = td->td_frame;
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PROC_LOCK(curthread->td_proc);
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mcp->mc_onstack = sigonstack(tp->tf_rsp);
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PROC_UNLOCK(curthread->td_proc);
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/* Entry into kernel always sets TF_HASSEGS */
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mcp->mc_gs = tp->tf_gs;
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mcp->mc_fs = tp->tf_fs;
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mcp->mc_es = tp->tf_es;
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mcp->mc_ds = tp->tf_ds;
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mcp->mc_edi = tp->tf_rdi;
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mcp->mc_esi = tp->tf_rsi;
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mcp->mc_ebp = tp->tf_rbp;
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mcp->mc_isp = tp->tf_rsp;
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mcp->mc_eflags = tp->tf_rflags;
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if (flags & GET_MC_CLEAR_RET) {
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mcp->mc_eax = 0;
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mcp->mc_edx = 0;
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mcp->mc_eflags &= ~PSL_C;
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} else {
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mcp->mc_eax = tp->tf_rax;
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mcp->mc_edx = tp->tf_rdx;
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}
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mcp->mc_ebx = tp->tf_rbx;
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mcp->mc_ecx = tp->tf_rcx;
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mcp->mc_eip = tp->tf_rip;
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mcp->mc_cs = tp->tf_cs;
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mcp->mc_esp = tp->tf_rsp;
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mcp->mc_ss = tp->tf_ss;
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mcp->mc_len = sizeof(*mcp);
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mcp->mc_flags = tp->tf_flags;
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ia32_get_fpcontext(td, mcp, NULL, 0);
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mcp->mc_fsbase = pcb->pcb_fsbase;
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mcp->mc_gsbase = pcb->pcb_gsbase;
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mcp->mc_xfpustate = 0;
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mcp->mc_xfpustate_len = 0;
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bzero(mcp->mc_spare2, sizeof(mcp->mc_spare2));
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return (0);
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}
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/*
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* Set machine context.
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*
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* However, we don't set any but the user modifiable flags, and we won't
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* touch the cs selector.
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*/
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static int
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ia32_set_mcontext(struct thread *td, const struct ia32_mcontext *mcp)
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{
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struct trapframe *tp;
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char *xfpustate;
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long rflags;
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int ret;
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tp = td->td_frame;
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if (mcp->mc_len != sizeof(*mcp))
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return (EINVAL);
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rflags = (mcp->mc_eflags & PSL_USERCHANGE) |
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(tp->tf_rflags & ~PSL_USERCHANGE);
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if (mcp->mc_flags & _MC_IA32_HASFPXSTATE) {
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if (mcp->mc_xfpustate_len > cpu_max_ext_state_size -
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sizeof(struct savefpu))
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return (EINVAL);
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xfpustate = __builtin_alloca(mcp->mc_xfpustate_len);
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ret = copyin(PTRIN(mcp->mc_xfpustate), xfpustate,
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mcp->mc_xfpustate_len);
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if (ret != 0)
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return (ret);
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} else
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xfpustate = NULL;
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ret = ia32_set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len);
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if (ret != 0)
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return (ret);
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tp->tf_gs = mcp->mc_gs;
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tp->tf_fs = mcp->mc_fs;
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tp->tf_es = mcp->mc_es;
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tp->tf_ds = mcp->mc_ds;
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tp->tf_flags = TF_HASSEGS;
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tp->tf_rdi = mcp->mc_edi;
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tp->tf_rsi = mcp->mc_esi;
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tp->tf_rbp = mcp->mc_ebp;
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tp->tf_rbx = mcp->mc_ebx;
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tp->tf_rdx = mcp->mc_edx;
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tp->tf_rcx = mcp->mc_ecx;
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tp->tf_rax = mcp->mc_eax;
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/* trapno, err */
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tp->tf_rip = mcp->mc_eip;
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tp->tf_rflags = rflags;
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tp->tf_rsp = mcp->mc_esp;
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tp->tf_ss = mcp->mc_ss;
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set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
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return (0);
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}
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/*
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* The first two fields of a ucontext_t are the signal mask and
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* the machine context. The next field is uc_link; we want to
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* avoid destroying the link when copying out contexts.
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*/
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#define UC_COPY_SIZE offsetof(struct ia32_ucontext, uc_link)
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int
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freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
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{
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struct ia32_ucontext uc;
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int ret;
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if (uap->ucp == NULL)
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ret = EINVAL;
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else {
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ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
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PROC_LOCK(td->td_proc);
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uc.uc_sigmask = td->td_sigmask;
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PROC_UNLOCK(td->td_proc);
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bzero(&uc.__spare__, sizeof(uc.__spare__));
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ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
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}
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return (ret);
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}
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int
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freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
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{
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struct ia32_ucontext uc;
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int ret;
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if (uap->ucp == NULL)
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ret = EINVAL;
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else {
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ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
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if (ret == 0) {
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ret = ia32_set_mcontext(td, &uc.uc_mcontext);
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if (ret == 0) {
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kern_sigprocmask(td, SIG_SETMASK,
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&uc.uc_sigmask, NULL, 0);
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}
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}
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}
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return (ret == 0 ? EJUSTRETURN : ret);
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}
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int
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freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
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{
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struct ia32_ucontext uc;
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int ret;
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if (uap->oucp == NULL || uap->ucp == NULL)
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ret = EINVAL;
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else {
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ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
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PROC_LOCK(td->td_proc);
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uc.uc_sigmask = td->td_sigmask;
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PROC_UNLOCK(td->td_proc);
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ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
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if (ret == 0) {
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ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
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if (ret == 0) {
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ret = ia32_set_mcontext(td, &uc.uc_mcontext);
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if (ret == 0) {
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kern_sigprocmask(td, SIG_SETMASK,
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&uc.uc_sigmask, NULL, 0);
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}
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}
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}
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}
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return (ret == 0 ? EJUSTRETURN : ret);
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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_43
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static void
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ia32_osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
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{
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struct ia32_sigframe3 sf, *fp;
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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 sig;
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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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sig = ksi->ksi_signo;
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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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/* Allocate space for the signal handler context. */
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if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
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SIGISMEMBER(psp->ps_sigonstack, sig)) {
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fp = (struct ia32_sigframe3 *)(td->td_sigstk.ss_sp +
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td->td_sigstk.ss_size - sizeof(sf));
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td->td_sigstk.ss_flags |= SS_ONSTACK;
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} else
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fp = (struct ia32_sigframe3 *)regs->tf_rsp - 1;
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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_scp = (register_t)&fp->sf_siginfo.si_sc;
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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_arg2 = (register_t)&fp->sf_siginfo;
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sf.sf_siginfo.si_signo = sig;
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sf.sf_siginfo.si_code = ksi->ksi_code;
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sf.sf_ah = (uintptr_t)catcher;
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} else {
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/* Old FreeBSD-style arguments. */
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sf.sf_arg2 = ksi->ksi_code;
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sf.sf_addr = (register_t)ksi->ksi_addr;
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sf.sf_ah = (uintptr_t)catcher;
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}
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mtx_unlock(&psp->ps_mtx);
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PROC_UNLOCK(p);
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/* Save most if not all of trap frame. */
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sf.sf_siginfo.si_sc.sc_eax = regs->tf_rax;
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sf.sf_siginfo.si_sc.sc_ebx = regs->tf_rbx;
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sf.sf_siginfo.si_sc.sc_ecx = regs->tf_rcx;
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sf.sf_siginfo.si_sc.sc_edx = regs->tf_rdx;
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sf.sf_siginfo.si_sc.sc_esi = regs->tf_rsi;
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sf.sf_siginfo.si_sc.sc_edi = regs->tf_rdi;
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sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
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sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
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sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
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sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
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sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
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sf.sf_siginfo.si_sc.sc_gs = regs->tf_gs;
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sf.sf_siginfo.si_sc.sc_isp = regs->tf_rsp;
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/* Build the signal context to be used by osigreturn(). */
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sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0;
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SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
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sf.sf_siginfo.si_sc.sc_esp = regs->tf_rsp;
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sf.sf_siginfo.si_sc.sc_ebp = regs->tf_rbp;
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sf.sf_siginfo.si_sc.sc_eip = regs->tf_rip;
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sf.sf_siginfo.si_sc.sc_eflags = regs->tf_rflags;
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sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
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sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
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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, fp, sizeof(*fp)) != 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)fp;
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regs->tf_rip = p->p_sysent->sv_psstrings - sz_ia32_osigcode;
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regs->tf_rflags &= ~(PSL_T | PSL_D);
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regs->tf_cs = _ucode32sel;
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regs->tf_ds = _udatasel;
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regs->tf_es = _udatasel;
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regs->tf_fs = _udatasel;
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regs->tf_ss = _udatasel;
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set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
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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
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#ifdef COMPAT_FREEBSD4
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static void
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freebsd4_ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
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{
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struct ia32_sigframe4 sf, *sfp;
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struct siginfo32 siginfo;
|
|
struct proc *p;
|
|
struct thread *td;
|
|
struct sigacts *psp;
|
|
struct trapframe *regs;
|
|
int oonstack;
|
|
int sig;
|
|
|
|
td = curthread;
|
|
p = td->td_proc;
|
|
siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
|
|
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
sig = siginfo.si_signo;
|
|
psp = p->p_sigacts;
|
|
mtx_assert(&psp->ps_mtx, MA_OWNED);
|
|
regs = td->td_frame;
|
|
oonstack = sigonstack(regs->tf_rsp);
|
|
|
|
/* Save user context. */
|
|
bzero(&sf, sizeof(sf));
|
|
sf.sf_uc.uc_sigmask = *mask;
|
|
sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
|
|
sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
|
|
sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
|
|
? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
|
|
sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
|
|
sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
|
|
sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
|
|
sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
|
|
sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
|
|
sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
|
|
sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
|
|
sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
|
|
sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
|
|
sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
|
|
sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
|
|
sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
|
|
sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
|
|
sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
|
|
sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
|
|
sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
|
|
sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
|
|
sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
|
|
sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
|
|
sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
|
|
bzero(sf.sf_uc.uc_mcontext.mc_fpregs,
|
|
sizeof(sf.sf_uc.uc_mcontext.mc_fpregs));
|
|
bzero(sf.sf_uc.uc_mcontext.__spare__,
|
|
sizeof(sf.sf_uc.uc_mcontext.__spare__));
|
|
bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
|
|
|
|
/* Allocate space for the signal handler context. */
|
|
if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
|
|
SIGISMEMBER(psp->ps_sigonstack, sig)) {
|
|
sfp = (struct ia32_sigframe4 *)(td->td_sigstk.ss_sp +
|
|
td->td_sigstk.ss_size - sizeof(sf));
|
|
} else
|
|
sfp = (struct ia32_sigframe4 *)regs->tf_rsp - 1;
|
|
PROC_UNLOCK(p);
|
|
|
|
/* Translate the signal if appropriate. */
|
|
if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
|
|
sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
|
|
|
|
/* Build the argument list for the signal handler. */
|
|
sf.sf_signum = sig;
|
|
sf.sf_ucontext = (register_t)&sfp->sf_uc;
|
|
bzero(&sf.sf_si, sizeof(sf.sf_si));
|
|
if (SIGISMEMBER(psp->ps_siginfo, sig)) {
|
|
/* Signal handler installed with SA_SIGINFO. */
|
|
sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
|
|
sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
|
|
|
|
/* Fill in POSIX parts */
|
|
sf.sf_si = siginfo;
|
|
sf.sf_si.si_signo = sig;
|
|
} else {
|
|
/* Old FreeBSD-style arguments. */
|
|
sf.sf_siginfo = siginfo.si_code;
|
|
sf.sf_addr = (u_int32_t)siginfo.si_addr;
|
|
sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
|
|
}
|
|
mtx_unlock(&psp->ps_mtx);
|
|
|
|
/*
|
|
* Copy the sigframe out to the user's stack.
|
|
*/
|
|
if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
|
|
#ifdef DEBUG
|
|
printf("process %ld has trashed its stack\n", (long)p->p_pid);
|
|
#endif
|
|
PROC_LOCK(p);
|
|
sigexit(td, SIGILL);
|
|
}
|
|
|
|
regs->tf_rsp = (uintptr_t)sfp;
|
|
regs->tf_rip = p->p_sysent->sv_sigcode_base + sz_ia32_sigcode -
|
|
sz_freebsd4_ia32_sigcode;
|
|
regs->tf_rflags &= ~(PSL_T | PSL_D);
|
|
regs->tf_cs = _ucode32sel;
|
|
regs->tf_ss = _udatasel;
|
|
regs->tf_ds = _udatasel;
|
|
regs->tf_es = _udatasel;
|
|
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
|
|
/* leave user %fs and %gs untouched */
|
|
PROC_LOCK(p);
|
|
mtx_lock(&psp->ps_mtx);
|
|
}
|
|
#endif /* COMPAT_FREEBSD4 */
|
|
|
|
void
|
|
ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
|
|
{
|
|
struct ia32_sigframe sf, *sfp;
|
|
struct siginfo32 siginfo;
|
|
struct proc *p;
|
|
struct thread *td;
|
|
struct sigacts *psp;
|
|
char *sp;
|
|
struct trapframe *regs;
|
|
char *xfpusave;
|
|
size_t xfpusave_len;
|
|
int oonstack;
|
|
int sig;
|
|
|
|
siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
|
|
td = curthread;
|
|
p = td->td_proc;
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
sig = siginfo.si_signo;
|
|
psp = p->p_sigacts;
|
|
#ifdef COMPAT_FREEBSD4
|
|
if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
|
|
freebsd4_ia32_sendsig(catcher, ksi, mask);
|
|
return;
|
|
}
|
|
#endif
|
|
#ifdef COMPAT_43
|
|
if (SIGISMEMBER(psp->ps_osigset, sig)) {
|
|
ia32_osendsig(catcher, ksi, mask);
|
|
return;
|
|
}
|
|
#endif
|
|
mtx_assert(&psp->ps_mtx, MA_OWNED);
|
|
regs = td->td_frame;
|
|
oonstack = sigonstack(regs->tf_rsp);
|
|
|
|
if (cpu_max_ext_state_size > sizeof(struct savefpu) && use_xsave) {
|
|
xfpusave_len = cpu_max_ext_state_size - sizeof(struct savefpu);
|
|
xfpusave = __builtin_alloca(xfpusave_len);
|
|
} else {
|
|
xfpusave_len = 0;
|
|
xfpusave = NULL;
|
|
}
|
|
|
|
/* Save user context. */
|
|
bzero(&sf, sizeof(sf));
|
|
sf.sf_uc.uc_sigmask = *mask;
|
|
sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
|
|
sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
|
|
sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
|
|
? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
|
|
sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
|
|
sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
|
|
sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
|
|
sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
|
|
sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
|
|
sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
|
|
sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
|
|
sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
|
|
sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
|
|
sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
|
|
sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
|
|
sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
|
|
sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
|
|
sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
|
|
sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
|
|
sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
|
|
sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
|
|
sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
|
|
sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
|
|
sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
|
|
sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
|
|
ia32_get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len);
|
|
fpstate_drop(td);
|
|
sf.sf_uc.uc_mcontext.mc_fsbase = td->td_pcb->pcb_fsbase;
|
|
sf.sf_uc.uc_mcontext.mc_gsbase = td->td_pcb->pcb_gsbase;
|
|
bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
|
|
|
|
/* Allocate space for the signal handler context. */
|
|
if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
|
|
SIGISMEMBER(psp->ps_sigonstack, sig))
|
|
sp = td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
|
|
else
|
|
sp = (char *)regs->tf_rsp;
|
|
if (xfpusave != NULL) {
|
|
sp -= xfpusave_len;
|
|
sp = (char *)((unsigned long)sp & ~0x3Ful);
|
|
sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
|
|
}
|
|
sp -= sizeof(sf);
|
|
/* Align to 16 bytes. */
|
|
sfp = (struct ia32_sigframe *)((uintptr_t)sp & ~0xF);
|
|
PROC_UNLOCK(p);
|
|
|
|
/* Translate the signal if appropriate. */
|
|
if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
|
|
sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
|
|
|
|
/* Build the argument list for the signal handler. */
|
|
sf.sf_signum = sig;
|
|
sf.sf_ucontext = (register_t)&sfp->sf_uc;
|
|
bzero(&sf.sf_si, sizeof(sf.sf_si));
|
|
if (SIGISMEMBER(psp->ps_siginfo, sig)) {
|
|
/* Signal handler installed with SA_SIGINFO. */
|
|
sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
|
|
sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
|
|
|
|
/* Fill in POSIX parts */
|
|
sf.sf_si = siginfo;
|
|
sf.sf_si.si_signo = sig;
|
|
} else {
|
|
/* Old FreeBSD-style arguments. */
|
|
sf.sf_siginfo = siginfo.si_code;
|
|
sf.sf_addr = (u_int32_t)siginfo.si_addr;
|
|
sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
|
|
}
|
|
mtx_unlock(&psp->ps_mtx);
|
|
|
|
/*
|
|
* Copy the sigframe out to the user's stack.
|
|
*/
|
|
if (copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
|
|
(xfpusave != NULL && copyout(xfpusave,
|
|
PTRIN(sf.sf_uc.uc_mcontext.mc_xfpustate), xfpusave_len)
|
|
!= 0)) {
|
|
#ifdef DEBUG
|
|
printf("process %ld has trashed its stack\n", (long)p->p_pid);
|
|
#endif
|
|
PROC_LOCK(p);
|
|
sigexit(td, SIGILL);
|
|
}
|
|
|
|
regs->tf_rsp = (uintptr_t)sfp;
|
|
regs->tf_rip = p->p_sysent->sv_sigcode_base;
|
|
regs->tf_rflags &= ~(PSL_T | PSL_D);
|
|
regs->tf_cs = _ucode32sel;
|
|
regs->tf_ss = _udatasel;
|
|
regs->tf_ds = _udatasel;
|
|
regs->tf_es = _udatasel;
|
|
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
|
|
/* XXXKIB leave user %fs and %gs untouched */
|
|
PROC_LOCK(p);
|
|
mtx_lock(&psp->ps_mtx);
|
|
}
|
|
|
|
/*
|
|
* System call to cleanup state after a signal
|
|
* has been taken. Reset signal mask and
|
|
* stack state from context left by sendsig (above).
|
|
* Return to previous pc and psl as specified by
|
|
* context left by sendsig. Check carefully to
|
|
* make sure that the user has not modified the
|
|
* state to gain improper privileges.
|
|
*/
|
|
|
|
#ifdef COMPAT_43
|
|
int
|
|
ofreebsd32_sigreturn(struct thread *td, struct ofreebsd32_sigreturn_args *uap)
|
|
{
|
|
struct ia32_sigcontext3 sc, *scp;
|
|
struct trapframe *regs;
|
|
int eflags, error;
|
|
ksiginfo_t ksi;
|
|
|
|
regs = td->td_frame;
|
|
error = copyin(uap->sigcntxp, &sc, sizeof(sc));
|
|
if (error != 0)
|
|
return (error);
|
|
scp = ≻
|
|
eflags = scp->sc_eflags;
|
|
if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
|
|
return (EINVAL);
|
|
}
|
|
if (!CS_SECURE(scp->sc_cs)) {
|
|
ksiginfo_init_trap(&ksi);
|
|
ksi.ksi_signo = SIGBUS;
|
|
ksi.ksi_code = BUS_OBJERR;
|
|
ksi.ksi_trapno = T_PROTFLT;
|
|
ksi.ksi_addr = (void *)regs->tf_rip;
|
|
trapsignal(td, &ksi);
|
|
return (EINVAL);
|
|
}
|
|
regs->tf_ds = scp->sc_ds;
|
|
regs->tf_es = scp->sc_es;
|
|
regs->tf_fs = scp->sc_fs;
|
|
regs->tf_gs = scp->sc_gs;
|
|
|
|
regs->tf_rax = scp->sc_eax;
|
|
regs->tf_rbx = scp->sc_ebx;
|
|
regs->tf_rcx = scp->sc_ecx;
|
|
regs->tf_rdx = scp->sc_edx;
|
|
regs->tf_rsi = scp->sc_esi;
|
|
regs->tf_rdi = scp->sc_edi;
|
|
regs->tf_cs = scp->sc_cs;
|
|
regs->tf_ss = scp->sc_ss;
|
|
regs->tf_rbp = scp->sc_ebp;
|
|
regs->tf_rsp = scp->sc_esp;
|
|
regs->tf_rip = scp->sc_eip;
|
|
regs->tf_rflags = eflags;
|
|
|
|
if (scp->sc_onstack & 1)
|
|
td->td_sigstk.ss_flags |= SS_ONSTACK;
|
|
else
|
|
td->td_sigstk.ss_flags &= ~SS_ONSTACK;
|
|
|
|
kern_sigprocmask(td, SIG_SETMASK, (sigset_t *)&scp->sc_mask, NULL,
|
|
SIGPROCMASK_OLD);
|
|
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
|
|
return (EJUSTRETURN);
|
|
}
|
|
#endif
|
|
|
|
#ifdef COMPAT_FREEBSD4
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
freebsd4_freebsd32_sigreturn(td, uap)
|
|
struct thread *td;
|
|
struct freebsd4_freebsd32_sigreturn_args /* {
|
|
const struct freebsd4_freebsd32_ucontext *sigcntxp;
|
|
} */ *uap;
|
|
{
|
|
struct ia32_ucontext4 uc;
|
|
struct trapframe *regs;
|
|
struct ia32_ucontext4 *ucp;
|
|
int cs, eflags, error;
|
|
ksiginfo_t ksi;
|
|
|
|
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)) {
|
|
uprintf("pid %d (%s): freebsd4_freebsd32_sigreturn eflags = 0x%x\n",
|
|
td->td_proc->p_pid, td->td_name, 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)) {
|
|
uprintf("pid %d (%s): freebsd4_sigreturn cs = 0x%x\n",
|
|
td->td_proc->p_pid, td->td_name, cs);
|
|
ksiginfo_init_trap(&ksi);
|
|
ksi.ksi_signo = SIGBUS;
|
|
ksi.ksi_code = BUS_OBJERR;
|
|
ksi.ksi_trapno = T_PROTFLT;
|
|
ksi.ksi_addr = (void *)regs->tf_rip;
|
|
trapsignal(td, &ksi);
|
|
return (EINVAL);
|
|
}
|
|
|
|
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;
|
|
regs->tf_ds = ucp->uc_mcontext.mc_ds;
|
|
regs->tf_es = ucp->uc_mcontext.mc_es;
|
|
regs->tf_fs = ucp->uc_mcontext.mc_fs;
|
|
regs->tf_gs = ucp->uc_mcontext.mc_gs;
|
|
|
|
kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
|
|
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
|
|
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 trapframe *regs;
|
|
struct ia32_ucontext *ucp;
|
|
char *xfpustate;
|
|
size_t xfpustate_len;
|
|
int cs, eflags, error, ret;
|
|
ksiginfo_t ksi;
|
|
|
|
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)) {
|
|
uprintf("pid %d (%s): freebsd32_sigreturn eflags = 0x%x\n",
|
|
td->td_proc->p_pid, td->td_name, 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)) {
|
|
uprintf("pid %d (%s): sigreturn cs = 0x%x\n",
|
|
td->td_proc->p_pid, td->td_name, cs);
|
|
ksiginfo_init_trap(&ksi);
|
|
ksi.ksi_signo = SIGBUS;
|
|
ksi.ksi_code = BUS_OBJERR;
|
|
ksi.ksi_trapno = T_PROTFLT;
|
|
ksi.ksi_addr = (void *)regs->tf_rip;
|
|
trapsignal(td, &ksi);
|
|
return (EINVAL);
|
|
}
|
|
|
|
if ((ucp->uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) {
|
|
xfpustate_len = uc.uc_mcontext.mc_xfpustate_len;
|
|
if (xfpustate_len > cpu_max_ext_state_size -
|
|
sizeof(struct savefpu)) {
|
|
uprintf("pid %d (%s): sigreturn xfpusave_len = 0x%zx\n",
|
|
td->td_proc->p_pid, td->td_name, xfpustate_len);
|
|
return (EINVAL);
|
|
}
|
|
xfpustate = __builtin_alloca(xfpustate_len);
|
|
error = copyin(PTRIN(ucp->uc_mcontext.mc_xfpustate),
|
|
xfpustate, xfpustate_len);
|
|
if (error != 0) {
|
|
uprintf(
|
|
"pid %d (%s): sigreturn copying xfpustate failed\n",
|
|
td->td_proc->p_pid, td->td_name);
|
|
return (error);
|
|
}
|
|
} else {
|
|
xfpustate = NULL;
|
|
xfpustate_len = 0;
|
|
}
|
|
ret = ia32_set_fpcontext(td, &ucp->uc_mcontext, xfpustate,
|
|
xfpustate_len);
|
|
if (ret != 0) {
|
|
uprintf("pid %d (%s): sigreturn set_fpcontext err %d\n",
|
|
td->td_proc->p_pid, td->td_name, ret);
|
|
return (ret);
|
|
}
|
|
|
|
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;
|
|
regs->tf_ds = ucp->uc_mcontext.mc_ds;
|
|
regs->tf_es = ucp->uc_mcontext.mc_es;
|
|
regs->tf_fs = ucp->uc_mcontext.mc_fs;
|
|
regs->tf_gs = ucp->uc_mcontext.mc_gs;
|
|
regs->tf_flags = TF_HASSEGS;
|
|
|
|
kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
|
|
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
|
|
return (EJUSTRETURN);
|
|
}
|
|
|
|
/*
|
|
* Clear registers on exec
|
|
*/
|
|
void
|
|
ia32_setregs(struct thread *td, struct image_params *imgp, u_long stack)
|
|
{
|
|
struct trapframe *regs = td->td_frame;
|
|
struct pcb *pcb = td->td_pcb;
|
|
|
|
mtx_lock(&dt_lock);
|
|
if (td->td_proc->p_md.md_ldt != NULL)
|
|
user_ldt_free(td);
|
|
else
|
|
mtx_unlock(&dt_lock);
|
|
#ifdef COMPAT_43
|
|
setup_lcall_gate();
|
|
#endif
|
|
|
|
pcb->pcb_fsbase = 0;
|
|
pcb->pcb_gsbase = 0;
|
|
pcb->pcb_initial_fpucw = __INITIAL_FPUCW_I386__;
|
|
|
|
bzero((char *)regs, sizeof(struct trapframe));
|
|
regs->tf_rip = imgp->entry_addr;
|
|
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 = imgp->ps_strings;
|
|
regs->tf_ds = _udatasel;
|
|
regs->tf_es = _udatasel;
|
|
regs->tf_fs = _ufssel;
|
|
regs->tf_gs = _ugssel;
|
|
regs->tf_flags = TF_HASSEGS;
|
|
|
|
fpstate_drop(td);
|
|
|
|
/* Return via doreti so that we can change to a different %cs */
|
|
set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET);
|
|
td->td_retval[1] = 0;
|
|
}
|