sys/amd64/ia32/ia32_reg.c

   1 /*-
   2  * Copyright (c) 2005 Peter Wemm
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD$
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include "opt_compat.h"
  33
  34 #include <sys/param.h>
  35 #include <sys/exec.h>
  36 #include <sys/fcntl.h>
  37 #include <sys/imgact.h>
  38 #include <sys/kernel.h>
  39 #include <sys/lock.h>
  40 #include <sys/malloc.h>
  41 #include <sys/mutex.h>
  42 #include <sys/mman.h>
  43 #include <sys/namei.h>
  44 #include <sys/pioctl.h>
  45 #include <sys/proc.h>
  46 #include <sys/procfs.h>
  47 #include <sys/resourcevar.h>
  48 #include <sys/systm.h>
  49 #include <sys/signalvar.h>
  50 #include <sys/stat.h>
  51 #include <sys/sx.h>
  52 #include <sys/syscall.h>
  53 #include <sys/sysctl.h>
  54 #include <sys/sysent.h>
  55 #include <sys/vnode.h>
  56
  57 #include <vm/vm.h>
  58 #include <vm/vm_kern.h>
  59 #include <vm/vm_param.h>
  60 #include <vm/pmap.h>
  61 #include <vm/vm_map.h>
  62 #include <vm/vm_object.h>
  63 #include <vm/vm_extern.h>
  64
  65 #include <compat/freebsd32/freebsd32_util.h>
  66 #include <compat/freebsd32/freebsd32_proto.h>
  67 #include <machine/fpu.h>
  68 #include <machine/psl.h>
  69 #include <machine/segments.h>
  70 #include <machine/specialreg.h>
  71 #include <machine/frame.h>
  72 #include <machine/md_var.h>
  73 #include <machine/pcb.h>
  74 #include <machine/cpufunc.h>
  75
  76 #define CS_SECURE(cs)           (ISPL(cs) == SEL_UPL)
  77 #define EFL_SECURE(ef, oef)     ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
  78
  79 int
  80 fill_regs32(struct thread *td, struct reg32 *regs)
  81 {
  82         struct trapframe *tp;
  83
  84         tp = td->td_frame;
  85         if (tp->tf_flags & TF_HASSEGS) {
  86                 regs->r_gs = tp->tf_gs;
  87                 regs->r_fs = tp->tf_fs;
  88                 regs->r_es = tp->tf_es;
  89                 regs->r_ds = tp->tf_ds;
  90         } else {
  91                 regs->r_gs = _ugssel;
  92                 regs->r_fs = _ufssel;
  93                 regs->r_es = _udatasel;
  94                 regs->r_ds = _udatasel;
  95         }
  96         regs->r_edi = tp->tf_rdi;
  97         regs->r_esi = tp->tf_rsi;
  98         regs->r_ebp = tp->tf_rbp;
  99         regs->r_ebx = tp->tf_rbx;
 100         regs->r_edx = tp->tf_rdx;
 101         regs->r_ecx = tp->tf_rcx;
 102         regs->r_eax = tp->tf_rax;
 103         regs->r_eip = tp->tf_rip;
 104         regs->r_cs = tp->tf_cs;
 105         regs->r_eflags = tp->tf_rflags;
 106         regs->r_esp = tp->tf_rsp;
 107         regs->r_ss = tp->tf_ss;
 108         return (0);
 109 }
 110
 111 int
 112 set_regs32(struct thread *td, struct reg32 *regs)
 113 {
 114         struct trapframe *tp;
 115
 116         tp = td->td_frame;
 117         if (!EFL_SECURE(regs->r_eflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs))
 118                 return (EINVAL);
 119         tp->tf_gs = regs->r_gs;
 120         tp->tf_fs = regs->r_fs;
 121         tp->tf_es = regs->r_es;
 122         tp->tf_ds = regs->r_ds;
 123         set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
 124         tp->tf_flags = TF_HASSEGS;
 125         tp->tf_rdi = regs->r_edi;
 126         tp->tf_rsi = regs->r_esi;
 127         tp->tf_rbp = regs->r_ebp;
 128         tp->tf_rbx = regs->r_ebx;
 129         tp->tf_rdx = regs->r_edx;
 130         tp->tf_rcx = regs->r_ecx;
 131         tp->tf_rax = regs->r_eax;
 132         tp->tf_rip = regs->r_eip;
 133         tp->tf_cs = regs->r_cs;
 134         tp->tf_rflags = regs->r_eflags;
 135         tp->tf_rsp = regs->r_esp;
 136         tp->tf_ss = regs->r_ss;
 137         return (0);
 138 }
 139
 140 int
 141 fill_fpregs32(struct thread *td, struct fpreg32 *regs)
 142 {
 143         struct savefpu *sv_fpu;
 144         struct save87 *sv_87;
 145         struct env87 *penv_87;
 146         struct envxmm *penv_xmm;
 147         int i;
 148
 149         bzero(regs, sizeof(*regs));
 150         sv_87 = (struct save87 *)regs;
 151         penv_87 = &sv_87->sv_env;
 152         fpugetregs(td);
 153         sv_fpu = get_pcb_user_save_td(td);
 154         penv_xmm = &sv_fpu->sv_env;
 155
 156         /* FPU control/status */
 157         penv_87->en_cw = penv_xmm->en_cw;
 158         penv_87->en_sw = penv_xmm->en_sw;
 159         penv_87->en_tw = penv_xmm->en_tw;
 160         /*
 161          * XXX for en_fip/fcs/foo/fos, check if the fxsave format
 162          * uses the old-style layout for 32 bit user apps.  If so,
 163          * read the ip and operand segment registers from there.
 164          * For now, use the process's %cs/%ds.
 165          */
 166         penv_87->en_fip = penv_xmm->en_rip;
 167         penv_87->en_fcs = td->td_frame->tf_cs;
 168         penv_87->en_opcode = penv_xmm->en_opcode;
 169         penv_87->en_foo = penv_xmm->en_rdp;
 170         /* Entry into the kernel always sets TF_HASSEGS */
 171         penv_87->en_fos = td->td_frame->tf_ds;
 172
 173         /* FPU registers */
 174         for (i = 0; i < 8; ++i)
 175                 sv_87->sv_ac[i] = sv_fpu->sv_fp[i].fp_acc;
 176
 177         return (0);
 178 }
 179
 180 int
 181 set_fpregs32(struct thread *td, struct fpreg32 *regs)
 182 {
 183         struct save87 *sv_87 = (struct save87 *)regs;
 184         struct env87 *penv_87 = &sv_87->sv_env;
 185         struct savefpu *sv_fpu = get_pcb_user_save_td(td);
 186         struct envxmm *penv_xmm = &sv_fpu->sv_env;
 187         int i;
 188
 189         /* FPU control/status */
 190         penv_xmm->en_cw = penv_87->en_cw;
 191         penv_xmm->en_sw = penv_87->en_sw;
 192         penv_xmm->en_tw = penv_87->en_tw;
 193         penv_xmm->en_rip = penv_87->en_fip;
 194         /* penv_87->en_fcs and en_fos ignored, see above */
 195         penv_xmm->en_opcode = penv_87->en_opcode;
 196         penv_xmm->en_rdp = penv_87->en_foo;
 197
 198         /* FPU registers */
 199         for (i = 0; i < 8; ++i)
 200                 sv_fpu->sv_fp[i].fp_acc = sv_87->sv_ac[i];
 201         for (i = 8; i < 16; ++i)
 202                 bzero(&sv_fpu->sv_fp[i].fp_acc, sizeof(sv_fpu->sv_fp[i].fp_acc));
 203         fpuuserinited(td);
 204
 205         return (0);
 206 }
 207
 208 int
 209 fill_dbregs32(struct thread *td, struct dbreg32 *regs)
 210 {
 211         struct dbreg dr;
 212         int err, i;
 213
 214         err = fill_dbregs(td, &dr);
 215         for (i = 0; i < 8; i++)
 216                 regs->dr[i] = dr.dr[i];
 217         return (err);
 218 }
 219
 220 int
 221 set_dbregs32(struct thread *td, struct dbreg32 *regs)
 222 {
 223         struct dbreg dr;
 224         int i;
 225
 226         for (i = 0; i < 8; i++)
 227                 dr.dr[i] = regs->dr[i];
 228         for (i = 8; i < 16; i++)
 229                 dr.dr[i] = 0;
 230         return (set_dbregs(td, &dr));
 231 }