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 #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 regs->r_err = 0; 109 regs->r_trapno = 0; 110 return (0); 111 } 112 113 int 114 set_regs32(struct thread *td, struct reg32 *regs) 115 { 116 struct trapframe *tp; 117 118 tp = td->td_frame; 119 if (!EFL_SECURE(regs->r_eflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs)) 120 return (EINVAL); 121 tp->tf_gs = regs->r_gs; 122 tp->tf_fs = regs->r_fs; 123 tp->tf_es = regs->r_es; 124 tp->tf_ds = regs->r_ds; 125 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 126 tp->tf_flags = TF_HASSEGS; 127 tp->tf_rdi = regs->r_edi; 128 tp->tf_rsi = regs->r_esi; 129 tp->tf_rbp = regs->r_ebp; 130 tp->tf_rbx = regs->r_ebx; 131 tp->tf_rdx = regs->r_edx; 132 tp->tf_rcx = regs->r_ecx; 133 tp->tf_rax = regs->r_eax; 134 tp->tf_rip = regs->r_eip; 135 tp->tf_cs = regs->r_cs; 136 tp->tf_rflags = regs->r_eflags; 137 tp->tf_rsp = regs->r_esp; 138 tp->tf_ss = regs->r_ss; 139 return (0); 140 } 141 142 int 143 fill_fpregs32(struct thread *td, struct fpreg32 *regs) 144 { 145 struct savefpu *sv_fpu; 146 struct save87 *sv_87; 147 struct env87 *penv_87; 148 struct envxmm *penv_xmm; 149 struct fpacc87 *fx_reg; 150 int i, st; 151 uint64_t mantissa; 152 uint16_t tw, exp; 153 uint8_t ab_tw; 154 155 bzero(regs, sizeof(*regs)); 156 sv_87 = (struct save87 *)regs; 157 penv_87 = &sv_87->sv_env; 158 fpugetregs(td); 159 sv_fpu = get_pcb_user_save_td(td); 160 penv_xmm = &sv_fpu->sv_env; 161 162 /* FPU control/status */ 163 penv_87->en_cw = penv_xmm->en_cw; 164 penv_87->en_sw = penv_xmm->en_sw; 165 166 /* 167 * XXX for en_fip/fcs/foo/fos, check if the fxsave format 168 * uses the old-style layout for 32 bit user apps. If so, 169 * read the ip and operand segment registers from there. 170 * For now, use the process's %cs/%ds. 171 */ 172 penv_87->en_fip = penv_xmm->en_rip; 173 penv_87->en_fcs = td->td_frame->tf_cs; 174 penv_87->en_opcode = penv_xmm->en_opcode; 175 penv_87->en_foo = penv_xmm->en_rdp; 176 /* Entry into the kernel always sets TF_HASSEGS */ 177 penv_87->en_fos = td->td_frame->tf_ds; 178 179 /* 180 * FPU registers and tags. 181 * For ST(i), i = fpu_reg - top; we start with fpu_reg=7. 182 */ 183 st = 7 - ((penv_xmm->en_sw >> 11) & 7); 184 ab_tw = penv_xmm->en_tw; 185 tw = 0; 186 for (i = 0x80; i != 0; i >>= 1) { 187 sv_87->sv_ac[st] = sv_fpu->sv_fp[st].fp_acc; 188 tw <<= 2; 189 if ((ab_tw & i) != 0) { 190 /* Non-empty - we need to check ST(i) */ 191 fx_reg = &sv_fpu->sv_fp[st].fp_acc; 192 /* The first 64 bits contain the mantissa. */ 193 mantissa = *((uint64_t *)fx_reg->fp_bytes); 194 /* 195 * The final 16 bits contain the sign bit and the exponent. 196 * Mask the sign bit since it is of no consequence to these 197 * tests. 198 */ 199 exp = *((uint16_t *)&fx_reg->fp_bytes[8]) & 0x7fff; 200 if (exp == 0) { 201 if (mantissa == 0) 202 tw |= 1; /* Zero */ 203 else 204 tw |= 2; /* Denormal */ 205 } else if (exp == 0x7fff) 206 tw |= 2; /* Infinity or NaN */ 207 } else 208 tw |= 3; /* Empty */ 209 st = (st - 1) & 7; 210 } 211 penv_87->en_tw = tw; 212 213 return (0); 214 } 215 216 int 217 set_fpregs32(struct thread *td, struct fpreg32 *regs) 218 { 219 struct save87 *sv_87 = (struct save87 *)regs; 220 struct env87 *penv_87 = &sv_87->sv_env; 221 struct savefpu *sv_fpu = get_pcb_user_save_td(td); 222 struct envxmm *penv_xmm = &sv_fpu->sv_env; 223 int i; 224 225 /* FPU control/status */ 226 penv_xmm->en_cw = penv_87->en_cw; 227 penv_xmm->en_sw = penv_87->en_sw; 228 penv_xmm->en_rip = penv_87->en_fip; 229 /* penv_87->en_fcs and en_fos ignored, see above */ 230 penv_xmm->en_opcode = penv_87->en_opcode; 231 penv_xmm->en_rdp = penv_87->en_foo; 232 233 /* FPU registers and tags */ 234 penv_xmm->en_tw = 0; 235 for (i = 0; i < 8; ++i) { 236 sv_fpu->sv_fp[i].fp_acc = sv_87->sv_ac[i]; 237 if ((penv_87->en_tw & (3 << i * 2)) != (3 << i * 2)) 238 penv_xmm->en_tw |= 1 << i; 239 } 240 241 for (i = 8; i < 16; ++i) 242 bzero(&sv_fpu->sv_fp[i].fp_acc, sizeof(sv_fpu->sv_fp[i].fp_acc)); 243 fpuuserinited(td); 244 245 return (0); 246 } 247 248 int 249 fill_dbregs32(struct thread *td, struct dbreg32 *regs) 250 { 251 struct dbreg dr; 252 int err, i; 253 254 err = fill_dbregs(td, &dr); 255 for (i = 0; i < 8; i++) 256 regs->dr[i] = dr.dr[i]; 257 return (err); 258 } 259 260 int 261 set_dbregs32(struct thread *td, struct dbreg32 *regs) 262 { 263 struct dbreg dr; 264 int i; 265 266 for (i = 0; i < 8; i++) 267 dr.dr[i] = regs->dr[i]; 268 for (i = 8; i < 16; i++) 269 dr.dr[i] = 0; 270 return (set_dbregs(td, &dr)); 271 } 272