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 <compat/ia32/ia32_reg.h> 69 #include <machine/psl.h> 70 #include <machine/segments.h> 71 #include <machine/specialreg.h> 72 #include <machine/frame.h> 73 #include <machine/md_var.h> 74 #include <machine/pcb.h> 75 #include <machine/cpufunc.h> 76 77 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 78 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 79 80 int 81 fill_regs32(struct thread *td, struct reg32 *regs) 82 { 83 struct pcb *pcb; 84 struct trapframe *tp; 85 86 tp = td->td_frame; 87 pcb = td->td_pcb; 88 if (tp->tf_flags & TF_HASSEGS) { 89 regs->r_gs = tp->tf_gs; 90 regs->r_fs = tp->tf_fs; 91 regs->r_es = tp->tf_es; 92 regs->r_ds = tp->tf_ds; 93 } else { 94 regs->r_gs = _ugssel; 95 regs->r_fs = _ufssel; 96 regs->r_es = _udatasel; 97 regs->r_ds = _udatasel; 98 } 99 regs->r_edi = tp->tf_rdi; 100 regs->r_esi = tp->tf_rsi; 101 regs->r_ebp = tp->tf_rbp; 102 regs->r_ebx = tp->tf_rbx; 103 regs->r_edx = tp->tf_rdx; 104 regs->r_ecx = tp->tf_rcx; 105 regs->r_eax = tp->tf_rax; 106 regs->r_eip = tp->tf_rip; 107 regs->r_cs = tp->tf_cs; 108 regs->r_eflags = tp->tf_rflags; 109 regs->r_esp = tp->tf_rsp; 110 regs->r_ss = tp->tf_ss; 111 return (0); 112 } 113 114 int 115 set_regs32(struct thread *td, struct reg32 *regs) 116 { 117 struct pcb *pcb; 118 struct trapframe *tp; 119 120 tp = td->td_frame; 121 if (!EFL_SECURE(regs->r_eflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs)) 122 return (EINVAL); 123 pcb = td->td_pcb; 124 tp->tf_gs = regs->r_gs; 125 tp->tf_fs = regs->r_fs; 126 tp->tf_es = regs->r_es; 127 tp->tf_ds = regs->r_ds; 128 td->td_pcb->pcb_full_iret = 1; 129 tp->tf_flags = TF_HASSEGS; 130 tp->tf_rdi = regs->r_edi; 131 tp->tf_rsi = regs->r_esi; 132 tp->tf_rbp = regs->r_ebp; 133 tp->tf_rbx = regs->r_ebx; 134 tp->tf_rdx = regs->r_edx; 135 tp->tf_rcx = regs->r_ecx; 136 tp->tf_rax = regs->r_eax; 137 tp->tf_rip = regs->r_eip; 138 tp->tf_cs = regs->r_cs; 139 tp->tf_rflags = regs->r_eflags; 140 tp->tf_rsp = regs->r_esp; 141 tp->tf_ss = regs->r_ss; 142 return (0); 143 } 144 145 int 146 fill_fpregs32(struct thread *td, struct fpreg32 *regs) 147 { 148 struct save87 *sv_87 = (struct save87 *)regs; 149 struct env87 *penv_87 = &sv_87->sv_env; 150 struct savefpu *sv_fpu = &td->td_pcb->pcb_save; 151 struct envxmm *penv_xmm = &sv_fpu->sv_env; 152 int i; 153 154 bzero(regs, sizeof(*regs)); 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 = &td->td_pcb->pcb_save; 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)); 203 204 return (0); 205 } 206 207 int 208 fill_dbregs32(struct thread *td, struct dbreg32 *regs) 209 { 210 struct dbreg dr; 211 int err, i; 212 213 err = fill_dbregs(td, &dr); 214 for (i = 0; i < 8; i++) 215 regs->dr[i] = dr.dr[i]; 216 return (err); 217 } 218 219 int 220 set_dbregs32(struct thread *td, struct dbreg32 *regs) 221 { 222 struct dbreg dr; 223 int i; 224 225 for (i = 0; i < 8; i++) 226 dr.dr[i] = regs->dr[i]; 227 for (i = 8; i < 16; i++) 228 dr.dr[i] = 0; 229 return (set_dbregs(td, &dr)); 230 } 231