1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005 Peter Wemm 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 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/proc.h> 45 #include <sys/procfs.h> 46 #include <sys/resourcevar.h> 47 #include <sys/systm.h> 48 #include <sys/signalvar.h> 49 #include <sys/stat.h> 50 #include <sys/sx.h> 51 #include <sys/syscall.h> 52 #include <sys/sysctl.h> 53 #include <sys/sysent.h> 54 #include <sys/vnode.h> 55 56 #include <vm/vm.h> 57 #include <vm/vm_kern.h> 58 #include <vm/vm_param.h> 59 #include <vm/pmap.h> 60 #include <vm/vm_map.h> 61 #include <vm/vm_object.h> 62 #include <vm/vm_extern.h> 63 64 #include <compat/freebsd32/freebsd32_util.h> 65 #include <compat/freebsd32/freebsd32_proto.h> 66 #include <machine/fpu.h> 67 #include <machine/psl.h> 68 #include <machine/segments.h> 69 #include <machine/specialreg.h> 70 #include <machine/frame.h> 71 #include <machine/md_var.h> 72 #include <machine/pcb.h> 73 #include <machine/cpufunc.h> 74 75 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 76 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 77 78 int 79 fill_regs32(struct thread *td, struct reg32 *regs) 80 { 81 struct trapframe *tp; 82 83 tp = td->td_frame; 84 if (tp->tf_flags & TF_HASSEGS) { 85 regs->r_gs = tp->tf_gs; 86 regs->r_fs = tp->tf_fs; 87 regs->r_es = tp->tf_es; 88 regs->r_ds = tp->tf_ds; 89 } else { 90 regs->r_gs = _ugssel; 91 regs->r_fs = _ufssel; 92 regs->r_es = _udatasel; 93 regs->r_ds = _udatasel; 94 } 95 regs->r_edi = tp->tf_rdi; 96 regs->r_esi = tp->tf_rsi; 97 regs->r_ebp = tp->tf_rbp; 98 regs->r_ebx = tp->tf_rbx; 99 regs->r_edx = tp->tf_rdx; 100 regs->r_ecx = tp->tf_rcx; 101 regs->r_eax = tp->tf_rax; 102 regs->r_eip = tp->tf_rip; 103 regs->r_cs = tp->tf_cs; 104 regs->r_eflags = tp->tf_rflags; 105 regs->r_esp = tp->tf_rsp; 106 regs->r_ss = tp->tf_ss; 107 regs->r_err = 0; 108 regs->r_trapno = 0; 109 return (0); 110 } 111 112 int 113 set_regs32(struct thread *td, struct reg32 *regs) 114 { 115 struct trapframe *tp; 116 117 tp = td->td_frame; 118 if (!EFL_SECURE(regs->r_eflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs)) 119 return (EINVAL); 120 tp->tf_gs = regs->r_gs; 121 tp->tf_fs = regs->r_fs; 122 tp->tf_es = regs->r_es; 123 tp->tf_ds = regs->r_ds; 124 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 125 tp->tf_flags = TF_HASSEGS; 126 tp->tf_rdi = regs->r_edi; 127 tp->tf_rsi = regs->r_esi; 128 tp->tf_rbp = regs->r_ebp; 129 tp->tf_rbx = regs->r_ebx; 130 tp->tf_rdx = regs->r_edx; 131 tp->tf_rcx = regs->r_ecx; 132 tp->tf_rax = regs->r_eax; 133 tp->tf_rip = regs->r_eip; 134 tp->tf_cs = regs->r_cs; 135 tp->tf_rflags = regs->r_eflags; 136 tp->tf_rsp = regs->r_esp; 137 tp->tf_ss = regs->r_ss; 138 return (0); 139 } 140 141 int 142 fill_fpregs32(struct thread *td, struct fpreg32 *regs) 143 { 144 struct savefpu *sv_fpu; 145 struct save87 *sv_87; 146 struct env87 *penv_87; 147 struct envxmm *penv_xmm; 148 struct fpacc87 *fx_reg; 149 int i, st; 150 uint64_t mantissa; 151 uint16_t tw, exp; 152 uint8_t ab_tw; 153 154 bzero(regs, sizeof(*regs)); 155 sv_87 = (struct save87 *)regs; 156 penv_87 = &sv_87->sv_env; 157 fpugetregs(td); 158 sv_fpu = get_pcb_user_save_td(td); 159 penv_xmm = &sv_fpu->sv_env; 160 161 /* FPU control/status */ 162 penv_87->en_cw = penv_xmm->en_cw; 163 penv_87->en_sw = penv_xmm->en_sw; 164 165 /* 166 * XXX for en_fip/fcs/foo/fos, check if the fxsave format 167 * uses the old-style layout for 32 bit user apps. If so, 168 * read the ip and operand segment registers from there. 169 * For now, use the process's %cs/%ds. 170 */ 171 penv_87->en_fip = penv_xmm->en_rip; 172 penv_87->en_fcs = td->td_frame->tf_cs; 173 penv_87->en_opcode = penv_xmm->en_opcode; 174 penv_87->en_foo = penv_xmm->en_rdp; 175 /* Entry into the kernel always sets TF_HASSEGS */ 176 penv_87->en_fos = td->td_frame->tf_ds; 177 178 /* 179 * FPU registers and tags. 180 * For ST(i), i = fpu_reg - top; we start with fpu_reg=7. 181 */ 182 st = 7 - ((penv_xmm->en_sw >> 11) & 7); 183 ab_tw = penv_xmm->en_tw; 184 tw = 0; 185 for (i = 0x80; i != 0; i >>= 1) { 186 sv_87->sv_ac[st] = sv_fpu->sv_fp[st].fp_acc; 187 tw <<= 2; 188 if ((ab_tw & i) != 0) { 189 /* Non-empty - we need to check ST(i) */ 190 fx_reg = &sv_fpu->sv_fp[st].fp_acc; 191 /* The first 64 bits contain the mantissa. */ 192 mantissa = *((uint64_t *)fx_reg->fp_bytes); 193 /* 194 * The final 16 bits contain the sign bit and the exponent. 195 * Mask the sign bit since it is of no consequence to these 196 * tests. 197 */ 198 exp = *((uint16_t *)&fx_reg->fp_bytes[8]) & 0x7fff; 199 if (exp == 0) { 200 if (mantissa == 0) 201 tw |= 1; /* Zero */ 202 else 203 tw |= 2; /* Denormal */ 204 } else if (exp == 0x7fff) 205 tw |= 2; /* Infinity or NaN */ 206 } else 207 tw |= 3; /* Empty */ 208 st = (st - 1) & 7; 209 } 210 penv_87->en_tw = tw; 211 212 return (0); 213 } 214 215 int 216 set_fpregs32(struct thread *td, struct fpreg32 *regs) 217 { 218 struct save87 *sv_87 = (struct save87 *)regs; 219 struct env87 *penv_87 = &sv_87->sv_env; 220 struct savefpu *sv_fpu = get_pcb_user_save_td(td); 221 struct envxmm *penv_xmm = &sv_fpu->sv_env; 222 int i; 223 224 /* FPU control/status */ 225 penv_xmm->en_cw = penv_87->en_cw; 226 penv_xmm->en_sw = penv_87->en_sw; 227 penv_xmm->en_rip = penv_87->en_fip; 228 /* penv_87->en_fcs and en_fos ignored, see above */ 229 penv_xmm->en_opcode = penv_87->en_opcode; 230 penv_xmm->en_rdp = penv_87->en_foo; 231 232 /* FPU registers and tags */ 233 penv_xmm->en_tw = 0; 234 for (i = 0; i < 8; ++i) { 235 sv_fpu->sv_fp[i].fp_acc = sv_87->sv_ac[i]; 236 if ((penv_87->en_tw & (3 << i * 2)) != (3 << i * 2)) 237 penv_xmm->en_tw |= 1 << i; 238 } 239 240 for (i = 8; i < 16; ++i) 241 bzero(&sv_fpu->sv_fp[i].fp_acc, sizeof(sv_fpu->sv_fp[i].fp_acc)); 242 fpuuserinited(td); 243 244 return (0); 245 } 246 247 int 248 fill_dbregs32(struct thread *td, struct dbreg32 *regs) 249 { 250 struct dbreg dr; 251 int err, i; 252 253 err = fill_dbregs(td, &dr); 254 for (i = 0; i < 8; i++) 255 regs->dr[i] = dr.dr[i]; 256 return (err); 257 } 258 259 int 260 set_dbregs32(struct thread *td, struct dbreg32 *regs) 261 { 262 struct dbreg dr; 263 int i; 264 265 for (i = 0; i < 8; i++) 266 dr.dr[i] = regs->dr[i]; 267 for (i = 8; i < 16; i++) 268 dr.dr[i] = 0; 269 return (set_dbregs(td, &dr)); 270 } 271