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/reg.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 int 77 fill_regs32(struct thread *td, struct reg32 *regs) 78 { 79 struct trapframe *tp; 80 81 tp = td->td_frame; 82 if (tp->tf_flags & TF_HASSEGS) { 83 regs->r_gs = tp->tf_gs; 84 regs->r_fs = tp->tf_fs; 85 regs->r_es = tp->tf_es; 86 regs->r_ds = tp->tf_ds; 87 } else { 88 regs->r_gs = _ugssel; 89 regs->r_fs = _ufssel; 90 regs->r_es = _udatasel; 91 regs->r_ds = _udatasel; 92 } 93 regs->r_edi = tp->tf_rdi; 94 regs->r_esi = tp->tf_rsi; 95 regs->r_ebp = tp->tf_rbp; 96 regs->r_ebx = tp->tf_rbx; 97 regs->r_edx = tp->tf_rdx; 98 regs->r_ecx = tp->tf_rcx; 99 regs->r_eax = tp->tf_rax; 100 regs->r_eip = tp->tf_rip; 101 regs->r_cs = tp->tf_cs; 102 regs->r_eflags = tp->tf_rflags; 103 regs->r_esp = tp->tf_rsp; 104 regs->r_ss = tp->tf_ss; 105 regs->r_err = 0; 106 regs->r_trapno = 0; 107 return (0); 108 } 109 110 int 111 set_regs32(struct thread *td, struct reg32 *regs) 112 { 113 struct trapframe *tp; 114 115 tp = td->td_frame; 116 if (!EFL_SECURE(regs->r_eflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs)) 117 return (EINVAL); 118 tp->tf_gs = regs->r_gs; 119 tp->tf_fs = regs->r_fs; 120 tp->tf_es = regs->r_es; 121 tp->tf_ds = regs->r_ds; 122 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 123 tp->tf_flags = TF_HASSEGS; 124 tp->tf_rdi = regs->r_edi; 125 tp->tf_rsi = regs->r_esi; 126 tp->tf_rbp = regs->r_ebp; 127 tp->tf_rbx = regs->r_ebx; 128 tp->tf_rdx = regs->r_edx; 129 tp->tf_rcx = regs->r_ecx; 130 tp->tf_rax = regs->r_eax; 131 tp->tf_rip = regs->r_eip; 132 tp->tf_cs = regs->r_cs; 133 tp->tf_rflags = regs->r_eflags; 134 tp->tf_rsp = regs->r_esp; 135 tp->tf_ss = regs->r_ss; 136 return (0); 137 } 138 139 int 140 fill_fpregs32(struct thread *td, struct fpreg32 *regs) 141 { 142 struct savefpu *sv_fpu; 143 struct save87 *sv_87; 144 struct env87 *penv_87; 145 struct envxmm *penv_xmm; 146 struct fpacc87 *fx_reg; 147 int i, st; 148 uint64_t mantissa; 149 uint16_t tw, exp; 150 uint8_t ab_tw; 151 152 bzero(regs, sizeof(*regs)); 153 sv_87 = (struct save87 *)regs; 154 penv_87 = &sv_87->sv_env; 155 fpugetregs(td); 156 sv_fpu = get_pcb_user_save_td(td); 157 penv_xmm = &sv_fpu->sv_env; 158 159 /* FPU control/status */ 160 penv_87->en_cw = penv_xmm->en_cw; 161 penv_87->en_sw = penv_xmm->en_sw; 162 163 /* 164 * XXX for en_fip/fcs/foo/fos, check if the fxsave format 165 * uses the old-style layout for 32 bit user apps. If so, 166 * read the ip and operand segment registers from there. 167 * For now, use the process's %cs/%ds. 168 */ 169 penv_87->en_fip = penv_xmm->en_rip; 170 penv_87->en_fcs = td->td_frame->tf_cs; 171 penv_87->en_opcode = penv_xmm->en_opcode; 172 penv_87->en_foo = penv_xmm->en_rdp; 173 /* Entry into the kernel always sets TF_HASSEGS */ 174 penv_87->en_fos = td->td_frame->tf_ds; 175 176 /* 177 * FPU registers and tags. 178 * For ST(i), i = fpu_reg - top; we start with fpu_reg=7. 179 */ 180 st = 7 - ((penv_xmm->en_sw >> 11) & 7); 181 ab_tw = penv_xmm->en_tw; 182 tw = 0; 183 for (i = 0x80; i != 0; i >>= 1) { 184 sv_87->sv_ac[st] = sv_fpu->sv_fp[st].fp_acc; 185 tw <<= 2; 186 if ((ab_tw & i) != 0) { 187 /* Non-empty - we need to check ST(i) */ 188 fx_reg = &sv_fpu->sv_fp[st].fp_acc; 189 /* The first 64 bits contain the mantissa. */ 190 mantissa = *((uint64_t *)fx_reg->fp_bytes); 191 /* 192 * The final 16 bits contain the sign bit and the exponent. 193 * Mask the sign bit since it is of no consequence to these 194 * tests. 195 */ 196 exp = *((uint16_t *)&fx_reg->fp_bytes[8]) & 0x7fff; 197 if (exp == 0) { 198 if (mantissa == 0) 199 tw |= 1; /* Zero */ 200 else 201 tw |= 2; /* Denormal */ 202 } else if (exp == 0x7fff) 203 tw |= 2; /* Infinity or NaN */ 204 } else 205 tw |= 3; /* Empty */ 206 st = (st - 1) & 7; 207 } 208 penv_87->en_tw = tw; 209 210 return (0); 211 } 212 213 int 214 set_fpregs32(struct thread *td, struct fpreg32 *regs) 215 { 216 struct save87 *sv_87 = (struct save87 *)regs; 217 struct env87 *penv_87 = &sv_87->sv_env; 218 struct savefpu *sv_fpu = get_pcb_user_save_td(td); 219 struct envxmm *penv_xmm = &sv_fpu->sv_env; 220 int i; 221 222 /* FPU control/status */ 223 penv_xmm->en_cw = penv_87->en_cw; 224 penv_xmm->en_sw = penv_87->en_sw; 225 penv_xmm->en_rip = penv_87->en_fip; 226 /* penv_87->en_fcs and en_fos ignored, see above */ 227 penv_xmm->en_opcode = penv_87->en_opcode; 228 penv_xmm->en_rdp = penv_87->en_foo; 229 230 /* FPU registers and tags */ 231 penv_xmm->en_tw = 0; 232 for (i = 0; i < 8; ++i) { 233 sv_fpu->sv_fp[i].fp_acc = sv_87->sv_ac[i]; 234 if ((penv_87->en_tw & (3 << i * 2)) != (3 << i * 2)) 235 penv_xmm->en_tw |= 1 << i; 236 } 237 238 for (i = 8; i < 16; ++i) 239 bzero(&sv_fpu->sv_fp[i].fp_acc, sizeof(sv_fpu->sv_fp[i].fp_acc)); 240 fpuuserinited(td); 241 242 return (0); 243 } 244 245 int 246 fill_dbregs32(struct thread *td, struct dbreg32 *regs) 247 { 248 struct dbreg dr; 249 int err, i; 250 251 err = fill_dbregs(td, &dr); 252 for (i = 0; i < 8; i++) 253 regs->dr[i] = dr.dr[i]; 254 return (err); 255 } 256 257 int 258 set_dbregs32(struct thread *td, struct dbreg32 *regs) 259 { 260 struct dbreg dr; 261 int i; 262 263 for (i = 0; i < 8; i++) 264 dr.dr[i] = regs->dr[i]; 265 for (i = 8; i < 16; i++) 266 dr.dr[i] = 0; 267 return (set_dbregs(td, &dr)); 268 } 269