1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 29 #include <sys/cdefs.h> 30 #include <sys/param.h> 31 #include <sys/elf.h> 32 #include <sys/exec.h> 33 #include <sys/fcntl.h> 34 #include <sys/imgact.h> 35 #include <sys/kernel.h> 36 #include <sys/lock.h> 37 #include <sys/malloc.h> 38 #include <sys/mutex.h> 39 #include <sys/mman.h> 40 #include <sys/namei.h> 41 #include <sys/proc.h> 42 #include <sys/procfs.h> 43 #include <sys/reg.h> 44 #include <sys/resourcevar.h> 45 #include <sys/systm.h> 46 #include <sys/signalvar.h> 47 #include <sys/stat.h> 48 #include <sys/sx.h> 49 #include <sys/syscall.h> 50 #include <sys/sysctl.h> 51 #include <sys/sysent.h> 52 #include <sys/vnode.h> 53 54 #include <vm/vm.h> 55 #include <vm/vm_kern.h> 56 #include <vm/vm_param.h> 57 #include <vm/pmap.h> 58 #include <vm/vm_map.h> 59 #include <vm/vm_object.h> 60 #include <vm/vm_extern.h> 61 62 #include <compat/freebsd32/freebsd32_util.h> 63 #include <compat/freebsd32/freebsd32_proto.h> 64 #include <machine/fpu.h> 65 #include <machine/psl.h> 66 #include <machine/segments.h> 67 #include <machine/specialreg.h> 68 #include <machine/frame.h> 69 #include <machine/md_var.h> 70 #include <machine/pcb.h> 71 #include <machine/cpufunc.h> 72 73 int 74 fill_regs32(struct thread *td, struct reg32 *regs) 75 { 76 struct trapframe *tp; 77 78 tp = td->td_frame; 79 if (tp->tf_flags & TF_HASSEGS) { 80 regs->r_gs = tp->tf_gs; 81 regs->r_fs = tp->tf_fs; 82 regs->r_es = tp->tf_es; 83 regs->r_ds = tp->tf_ds; 84 } else { 85 regs->r_gs = _ugssel; 86 regs->r_fs = _ufssel; 87 regs->r_es = _udatasel; 88 regs->r_ds = _udatasel; 89 } 90 regs->r_edi = tp->tf_rdi; 91 regs->r_esi = tp->tf_rsi; 92 regs->r_ebp = tp->tf_rbp; 93 regs->r_ebx = tp->tf_rbx; 94 regs->r_edx = tp->tf_rdx; 95 regs->r_ecx = tp->tf_rcx; 96 regs->r_eax = tp->tf_rax; 97 regs->r_eip = tp->tf_rip; 98 regs->r_cs = tp->tf_cs; 99 regs->r_eflags = tp->tf_rflags; 100 regs->r_esp = tp->tf_rsp; 101 regs->r_ss = tp->tf_ss; 102 regs->r_err = 0; 103 regs->r_trapno = 0; 104 return (0); 105 } 106 107 int 108 set_regs32(struct thread *td, struct reg32 *regs) 109 { 110 struct trapframe *tp; 111 112 tp = td->td_frame; 113 if (!EFL_SECURE(regs->r_eflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs)) 114 return (EINVAL); 115 tp->tf_gs = regs->r_gs; 116 tp->tf_fs = regs->r_fs; 117 tp->tf_es = regs->r_es; 118 tp->tf_ds = regs->r_ds; 119 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 120 tp->tf_flags = TF_HASSEGS; 121 tp->tf_rdi = regs->r_edi; 122 tp->tf_rsi = regs->r_esi; 123 tp->tf_rbp = regs->r_ebp; 124 tp->tf_rbx = regs->r_ebx; 125 tp->tf_rdx = regs->r_edx; 126 tp->tf_rcx = regs->r_ecx; 127 tp->tf_rax = regs->r_eax; 128 tp->tf_rip = regs->r_eip; 129 tp->tf_cs = regs->r_cs; 130 tp->tf_rflags = regs->r_eflags; 131 tp->tf_rsp = regs->r_esp; 132 tp->tf_ss = regs->r_ss; 133 return (0); 134 } 135 136 int 137 fill_fpregs32(struct thread *td, struct fpreg32 *regs) 138 { 139 struct savefpu *sv_fpu; 140 struct save87 *sv_87; 141 struct env87 *penv_87; 142 struct envxmm *penv_xmm; 143 struct fpacc87 *fx_reg; 144 int i, st; 145 uint64_t mantissa; 146 uint16_t tw, exp; 147 uint8_t ab_tw; 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; 159 160 /* 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 /* 174 * FPU registers and tags. 175 * For ST(i), i = fpu_reg - top; we start with fpu_reg=7. 176 */ 177 st = 7 - ((penv_xmm->en_sw >> 11) & 7); 178 ab_tw = penv_xmm->en_tw; 179 tw = 0; 180 for (i = 0x80; i != 0; i >>= 1) { 181 sv_87->sv_ac[st] = sv_fpu->sv_fp[st].fp_acc; 182 tw <<= 2; 183 if ((ab_tw & i) != 0) { 184 /* Non-empty - we need to check ST(i) */ 185 fx_reg = &sv_fpu->sv_fp[st].fp_acc; 186 /* The first 64 bits contain the mantissa. */ 187 mantissa = *((uint64_t *)fx_reg->fp_bytes); 188 /* 189 * The final 16 bits contain the sign bit and the exponent. 190 * Mask the sign bit since it is of no consequence to these 191 * tests. 192 */ 193 exp = *((uint16_t *)&fx_reg->fp_bytes[8]) & 0x7fff; 194 if (exp == 0) { 195 if (mantissa == 0) 196 tw |= 1; /* Zero */ 197 else 198 tw |= 2; /* Denormal */ 199 } else if (exp == 0x7fff) 200 tw |= 2; /* Infinity or NaN */ 201 } else 202 tw |= 3; /* Empty */ 203 st = (st - 1) & 7; 204 } 205 penv_87->en_tw = tw; 206 207 return (0); 208 } 209 210 int 211 set_fpregs32(struct thread *td, struct fpreg32 *regs) 212 { 213 struct save87 *sv_87 = (struct save87 *)regs; 214 struct env87 *penv_87 = &sv_87->sv_env; 215 struct savefpu *sv_fpu = get_pcb_user_save_td(td); 216 struct envxmm *penv_xmm = &sv_fpu->sv_env; 217 int i; 218 219 /* FPU control/status */ 220 penv_xmm->en_cw = penv_87->en_cw; 221 penv_xmm->en_sw = penv_87->en_sw; 222 penv_xmm->en_rip = penv_87->en_fip; 223 /* penv_87->en_fcs and en_fos ignored, see above */ 224 penv_xmm->en_opcode = penv_87->en_opcode; 225 penv_xmm->en_rdp = penv_87->en_foo; 226 227 /* FPU registers and tags */ 228 penv_xmm->en_tw = 0; 229 for (i = 0; i < 8; ++i) { 230 sv_fpu->sv_fp[i].fp_acc = sv_87->sv_ac[i]; 231 if ((penv_87->en_tw & (3 << i * 2)) != (3 << i * 2)) 232 penv_xmm->en_tw |= 1 << i; 233 } 234 235 for (i = 8; i < 16; ++i) 236 bzero(&sv_fpu->sv_fp[i].fp_acc, sizeof(sv_fpu->sv_fp[i].fp_acc)); 237 fpuuserinited(td); 238 239 return (0); 240 } 241 242 int 243 fill_dbregs32(struct thread *td, struct dbreg32 *regs) 244 { 245 struct dbreg dr; 246 int err, i; 247 248 err = fill_dbregs(td, &dr); 249 for (i = 0; i < 8; i++) 250 regs->dr[i] = dr.dr[i]; 251 return (err); 252 } 253 254 int 255 set_dbregs32(struct thread *td, struct dbreg32 *regs) 256 { 257 struct dbreg dr; 258 int i; 259 260 for (i = 0; i < 8; i++) 261 dr.dr[i] = regs->dr[i]; 262 for (i = 8; i < 16; i++) 263 dr.dr[i] = 0; 264 return (set_dbregs(td, &dr)); 265 } 266 267 static bool 268 get_i386_segbases(struct regset *rs, struct thread *td, void *buf, 269 size_t *sizep) 270 { 271 struct segbasereg32 *reg; 272 struct pcb *pcb; 273 274 if (buf != NULL) { 275 KASSERT(*sizep == sizeof(*reg), ("%s: invalid size", __func__)); 276 reg = buf; 277 278 pcb = td->td_pcb; 279 if (td == curthread) 280 update_pcb_bases(pcb); 281 reg->r_fsbase = pcb->pcb_fsbase; 282 reg->r_gsbase = pcb->pcb_gsbase; 283 } 284 *sizep = sizeof(*reg); 285 return (true); 286 } 287 288 static bool 289 set_i386_segbases(struct regset *rs, struct thread *td, void *buf, 290 size_t size) 291 { 292 struct segbasereg32 *reg; 293 struct pcb *pcb; 294 295 KASSERT(size == sizeof(*reg), ("%s: invalid size", __func__)); 296 reg = buf; 297 298 pcb = td->td_pcb; 299 set_pcb_flags(pcb, PCB_FULL_IRET); 300 pcb->pcb_fsbase = reg->r_fsbase; 301 td->td_frame->tf_fs = _ufssel; 302 pcb->pcb_gsbase = reg->r_gsbase; 303 td->td_frame->tf_gs = _ugssel; 304 305 return (true); 306 } 307 308 static struct regset regset_i386_segbases = { 309 .note = NT_X86_SEGBASES, 310 .size = sizeof(struct segbasereg), 311 .get = get_i386_segbases, 312 .set = set_i386_segbases, 313 }; 314 ELF32_REGSET(regset_i386_segbases); 315