2 * Copyright (c) 2018-2019 The FreeBSD Foundation
3 * Copyright (c) 2003 Peter Wemm.
4 * Copyright (c) 1993 The Regents of the University of California.
7 * Portions of this software were developed by
8 * Konstantin Belousov <kib@FreeBSD.org> under sponsorship from
9 * the FreeBSD Foundation.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 #include <machine/asmacros.h>
41 #include <machine/specialreg.h>
42 #include <machine/pmap.h>
51 movl $PAGE_SIZE/8,%ecx
70 * pagecopy(%rdi=from, %rsi=to)
74 movl $PAGE_SIZE/8,%ecx
120 movq -8(%rdi,%rdx),%r8
121 movq -8(%rsi,%rdx),%r9
132 movl -4(%rdi,%rdx),%r8d
133 movl -4(%rsi,%rdx),%r9d
144 movzwl -2(%rdi,%rdx),%r8d
145 movzwl -2(%rsi,%rdx),%r9d
162 movq -16(%rdi,%rdx),%r8
163 movq -16(%rsi,%rdx),%r9
166 movq -8(%rdi,%rdx),%r8
167 movq -8(%rsi,%rdx),%r9
199 * Mismatch was found.
201 * Before we compute it we narrow down the range (16 -> 8 -> 4 bytes).
218 leaq -8(%rdi,%rdx),%rdi
219 leaq -8(%rsi,%rdx),%rsi
223 leaq -16(%rdi,%rdx),%rdi
224 leaq -16(%rsi,%rdx),%rsi
233 leaq -4(%rdi,%rdx),%rdi
234 leaq -4(%rsi,%rdx),%rsi
247 * We have up to 4 bytes to inspect.
274 * memmove(dst, src, cnt)
279 * Register state at entry is supposed to be as follows:
284 * The macro possibly clobbers the above and: rcx, r8, r9, r10
285 * It does not clobber rax nor r11.
287 .macro MEMMOVE erms overlap begin end
291 * For sizes 0..32 all data is read before it is written, so there
292 * is no correctness issue with direction of copying.
300 cmpq %rcx,%r8 /* overlapping && src < dst? */
332 movq -16(%rsi,%rcx),%r9
333 movq -8(%rsi,%rcx),%r10
336 movq %r9,-16(%rdi,%rcx)
337 movq %r10,-8(%rdi,%rcx)
345 movq -8(%rsi,%rcx),%r8
347 movq %r8,-8(%rdi,%rcx,)
355 movl -4(%rsi,%rcx),%r8d
357 movl %r8d,-4(%rdi,%rcx)
365 movzwl -2(%rsi,%rcx),%r8d
367 movw %r8w,-2(%rdi,%rcx)
388 shrq $3,%rcx /* copy by 64-bit words */
392 andl $7,%ecx /* any bytes left? */
403 leaq -16(%rdx,%rcx),%rdx
405 leaq 16(%rdi,%rcx),%rdi
406 leaq 16(%rsi,%rcx),%rsi
414 shrq $3,%rcx /* copy by 64-bit words */
420 andl $7,%ecx /* any bytes left? */
435 leaq -8(%rdi,%rcx),%rdi
436 leaq -8(%rsi,%rcx),%rsi
510 leaq -8(%rdi,%rcx),%rdi
511 leaq -8(%rsi,%rcx),%rsi
535 MEMMOVE erms=0 overlap=1 begin=MEMMOVE_BEGIN end=MEMMOVE_END
539 MEMMOVE erms=1 overlap=1 begin=MEMMOVE_BEGIN end=MEMMOVE_END
543 * memcpy(dst, src, len)
546 * Note: memcpy does not support overlapping copies
549 MEMMOVE erms=0 overlap=0 begin=MEMMOVE_BEGIN end=MEMMOVE_END
553 MEMMOVE erms=1 overlap=0 begin=MEMMOVE_BEGIN end=MEMMOVE_END
557 * memset(dst, c, len)
565 movabs $0x0101010101010101,%r10
586 movq %r10,-16(%rdi,%rcx)
587 movq %r10,-8(%rdi,%rcx)
597 movq %r10,-16(%rdi,%rcx)
598 movq %r10,-8(%rdi,%rcx)
606 movq %r10,-8(%rdi,%rcx)
614 movl %r10d,-4(%rdi,%rcx)
622 movw %r10w,-2(%rdi,%rcx)
655 movq %r10,-8(%rdi,%rdx)
665 leaq -16(%rcx,%r8),%rcx
667 leaq 16(%rdi,%r8),%rdi
679 /* fillw(pat, base, cnt) */
680 /* %rdi,%rsi, %rdx */
696 * Uses the ((x - 0x01....01) & ~x & 0x80....80) trick.
698 * 0x01....01 is replaced with 0x0 - 0x01....01 so that it can be added
701 * For a description see either:
702 * - "Hacker's Delight" by Henry S. Warren, Jr.
703 * - "Optimizing subroutines in assembly language: An optimization guide for x86 platforms"
706 * The latter contains a 32-bit variant of the same algorithm coded in assembly for i386.
710 movabsq $0xfefefefefefefeff,%r8
711 movabsq $0x8080808080808080,%r9
719 * Handle misaligned reads: align to 8 and fill
720 * the spurious bytes.
752 leaq (%rcx,%rdi),%rax
758 /*****************************************************************************/
759 /* copyout and fubyte family */
760 /*****************************************************************************/
762 * Access user memory from inside the kernel. These routines should be
763 * the only places that do this.
765 * These routines set curpcb->pcb_onfault for the time they execute. When a
766 * protection violation occurs inside the functions, the trap handler
767 * returns to *curpcb->pcb_onfault instead of the function.
770 .macro SMAP_DISABLE smap
777 .macro SMAP_ENABLE smap
783 .macro COPYINOUT_BEGIN
787 movq %rax,PCB_ONFAULT(%r11)
791 .macro COPYINOUT_SMAP_END
797 * copyout(from_kernel, to_user, len)
800 .macro COPYOUT smap erms
802 movq PCPU(CURPCB),%r11
803 movq $copy_fault,PCB_ONFAULT(%r11)
806 * Check explicitly for non-user addresses.
807 * First, prevent address wrapping.
813 * XXX STOP USING VM_MAXUSER_ADDRESS.
814 * It is an end address, not a max, so every time it is used correctly it
815 * looks like there is an off by one error, and of course it caused an off
816 * by one error in several places.
818 movq $VM_MAXUSER_ADDRESS,%rcx
823 * Set return value to zero. Remaining failure mode goes through
829 * Set up arguments for MEMMOVE.
839 MEMMOVE erms=\erms overlap=0 begin=COPYINOUT_BEGIN end=COPYINOUT_SMAP_END
841 MEMMOVE erms=\erms overlap=0 begin=COPYINOUT_BEGIN end=COPYINOUT_END
846 ENTRY(copyout_nosmap_std)
847 COPYOUT smap=0 erms=0
848 END(copyout_nosmap_std)
850 ENTRY(copyout_smap_std)
851 COPYOUT smap=1 erms=0
852 END(copyout_smap_std)
854 ENTRY(copyout_nosmap_erms)
855 COPYOUT smap=0 erms=1
856 END(copyout_nosmap_erms)
858 ENTRY(copyout_smap_erms)
859 COPYOUT smap=1 erms=1
860 END(copyout_smap_erms)
863 * copyin(from_user, to_kernel, len)
866 .macro COPYIN smap erms
868 movq PCPU(CURPCB),%r11
869 movq $copy_fault,PCB_ONFAULT(%r11)
872 * make sure address is valid
877 movq $VM_MAXUSER_ADDRESS,%rcx
890 MEMMOVE erms=\erms overlap=0 begin=COPYINOUT_BEGIN end=COPYINOUT_SMAP_END
892 MEMMOVE erms=\erms overlap=0 begin=COPYINOUT_BEGIN end=COPYINOUT_END
897 ENTRY(copyin_nosmap_std)
899 END(copyin_nosmap_std)
901 ENTRY(copyin_smap_std)
905 ENTRY(copyin_nosmap_erms)
907 END(copyin_nosmap_erms)
909 ENTRY(copyin_smap_erms)
911 END(copyin_smap_erms)
915 testl $CPUID_STDEXT_SMAP,cpu_stdext_feature(%rip)
918 1: movq $0,PCB_ONFAULT(%r11)
924 * casueword32. Compare and set user integer. Returns -1 on fault,
925 * 0 if access was successful, and 1 when comparison failed.
926 * Old value is written to *oldp.
927 * dst = %rdi, old = %esi, oldp = %rdx, new = %ecx
929 ENTRY(casueword32_nosmap)
931 movq PCPU(CURPCB),%r8
932 movq $fusufault,PCB_ONFAULT(%r8)
934 movq $VM_MAXUSER_ADDRESS-4,%rax
935 cmpq %rax,%rdi /* verify address is valid */
938 movl %esi,%eax /* old */
942 cmpxchgl %ecx,(%rdi) /* new = %ecx */
946 * The old value is in %eax. If the store succeeded it will be the
947 * value we expected (old) from before the store, otherwise it will
948 * be the current value. Save %eax into %esi to prepare the return
953 movq %rax,PCB_ONFAULT(%r8)
956 * Access the oldp after the pcb_onfault is cleared, to correctly
957 * catch corrupted pointer.
959 movl %esi,(%rdx) /* oldp = %rdx */
963 END(casueword32_nosmap)
965 ENTRY(casueword32_smap)
967 movq PCPU(CURPCB),%r8
968 movq $fusufault,PCB_ONFAULT(%r8)
970 movq $VM_MAXUSER_ADDRESS-4,%rax
971 cmpq %rax,%rdi /* verify address is valid */
974 movl %esi,%eax /* old */
979 cmpxchgl %ecx,(%rdi) /* new = %ecx */
984 * The old value is in %eax. If the store succeeded it will be the
985 * value we expected (old) from before the store, otherwise it will
986 * be the current value. Save %eax into %esi to prepare the return
991 movq %rax,PCB_ONFAULT(%r8)
994 * Access the oldp after the pcb_onfault is cleared, to correctly
995 * catch corrupted pointer.
997 movl %esi,(%rdx) /* oldp = %rdx */
1001 END(casueword32_smap)
1004 * casueword. Compare and set user long. Returns -1 on fault,
1005 * 0 if access was successful, and 1 when comparison failed.
1006 * Old value is written to *oldp.
1007 * dst = %rdi, old = %rsi, oldp = %rdx, new = %rcx
1009 ENTRY(casueword_nosmap)
1011 movq PCPU(CURPCB),%r8
1012 movq $fusufault,PCB_ONFAULT(%r8)
1014 movq $VM_MAXUSER_ADDRESS-4,%rax
1015 cmpq %rax,%rdi /* verify address is valid */
1018 movq %rsi,%rax /* old */
1022 cmpxchgq %rcx,(%rdi) /* new = %rcx */
1026 * The old value is in %rax. If the store succeeded it will be the
1027 * value we expected (old) from before the store, otherwise it will
1028 * be the current value.
1032 movq %rax,PCB_ONFAULT(%r8)
1037 END(casueword_nosmap)
1039 ENTRY(casueword_smap)
1041 movq PCPU(CURPCB),%r8
1042 movq $fusufault,PCB_ONFAULT(%r8)
1044 movq $VM_MAXUSER_ADDRESS-4,%rax
1045 cmpq %rax,%rdi /* verify address is valid */
1048 movq %rsi,%rax /* old */
1053 cmpxchgq %rcx,(%rdi) /* new = %rcx */
1058 * The old value is in %rax. If the store succeeded it will be the
1059 * value we expected (old) from before the store, otherwise it will
1060 * be the current value.
1064 movq %rax,PCB_ONFAULT(%r8)
1072 * Fetch (load) a 64-bit word, a 32-bit word, a 16-bit word, or an 8-bit
1073 * byte from user memory.
1074 * addr = %rdi, valp = %rsi
1077 ENTRY(fueword_nosmap)
1079 movq PCPU(CURPCB),%rcx
1080 movq $fusufault,PCB_ONFAULT(%rcx)
1082 movq $VM_MAXUSER_ADDRESS-8,%rax
1083 cmpq %rax,%rdi /* verify address is valid */
1088 movq %rax,PCB_ONFAULT(%rcx)
1096 movq PCPU(CURPCB),%rcx
1097 movq $fusufault,PCB_ONFAULT(%rcx)
1099 movq $VM_MAXUSER_ADDRESS-8,%rax
1100 cmpq %rax,%rdi /* verify address is valid */
1107 movq %rax,PCB_ONFAULT(%rcx)
1113 ENTRY(fueword32_nosmap)
1115 movq PCPU(CURPCB),%rcx
1116 movq $fusufault,PCB_ONFAULT(%rcx)
1118 movq $VM_MAXUSER_ADDRESS-4,%rax
1119 cmpq %rax,%rdi /* verify address is valid */
1124 movq %rax,PCB_ONFAULT(%rcx)
1128 END(fueword32_nosmap)
1130 ENTRY(fueword32_smap)
1132 movq PCPU(CURPCB),%rcx
1133 movq $fusufault,PCB_ONFAULT(%rcx)
1135 movq $VM_MAXUSER_ADDRESS-4,%rax
1136 cmpq %rax,%rdi /* verify address is valid */
1143 movq %rax,PCB_ONFAULT(%rcx)
1149 ENTRY(fuword16_nosmap)
1151 movq PCPU(CURPCB),%rcx
1152 movq $fusufault,PCB_ONFAULT(%rcx)
1154 movq $VM_MAXUSER_ADDRESS-2,%rax
1159 movq $0,PCB_ONFAULT(%rcx)
1162 END(fuword16_nosmap)
1164 ENTRY(fuword16_smap)
1166 movq PCPU(CURPCB),%rcx
1167 movq $fusufault,PCB_ONFAULT(%rcx)
1169 movq $VM_MAXUSER_ADDRESS-2,%rax
1176 movq $0,PCB_ONFAULT(%rcx)
1181 ENTRY(fubyte_nosmap)
1183 movq PCPU(CURPCB),%rcx
1184 movq $fusufault,PCB_ONFAULT(%rcx)
1186 movq $VM_MAXUSER_ADDRESS-1,%rax
1191 movq $0,PCB_ONFAULT(%rcx)
1198 movq PCPU(CURPCB),%rcx
1199 movq $fusufault,PCB_ONFAULT(%rcx)
1201 movq $VM_MAXUSER_ADDRESS-1,%rax
1208 movq $0,PCB_ONFAULT(%rcx)
1214 * Store a 64-bit word, a 32-bit word, a 16-bit word, or an 8-bit byte to
1216 * addr = %rdi, value = %rsi
1218 ENTRY(suword_nosmap)
1220 movq PCPU(CURPCB),%rcx
1221 movq $fusufault,PCB_ONFAULT(%rcx)
1223 movq $VM_MAXUSER_ADDRESS-8,%rax
1224 cmpq %rax,%rdi /* verify address validity */
1229 movq %rax,PCB_ONFAULT(%rcx)
1236 movq PCPU(CURPCB),%rcx
1237 movq $fusufault,PCB_ONFAULT(%rcx)
1239 movq $VM_MAXUSER_ADDRESS-8,%rax
1240 cmpq %rax,%rdi /* verify address validity */
1247 movq %rax,PCB_ONFAULT(%rcx)
1252 ENTRY(suword32_nosmap)
1254 movq PCPU(CURPCB),%rcx
1255 movq $fusufault,PCB_ONFAULT(%rcx)
1257 movq $VM_MAXUSER_ADDRESS-4,%rax
1258 cmpq %rax,%rdi /* verify address validity */
1263 movq %rax,PCB_ONFAULT(%rcx)
1266 END(suword32_nosmap)
1268 ENTRY(suword32_smap)
1270 movq PCPU(CURPCB),%rcx
1271 movq $fusufault,PCB_ONFAULT(%rcx)
1273 movq $VM_MAXUSER_ADDRESS-4,%rax
1274 cmpq %rax,%rdi /* verify address validity */
1281 movq %rax,PCB_ONFAULT(%rcx)
1286 ENTRY(suword16_nosmap)
1288 movq PCPU(CURPCB),%rcx
1289 movq $fusufault,PCB_ONFAULT(%rcx)
1291 movq $VM_MAXUSER_ADDRESS-2,%rax
1292 cmpq %rax,%rdi /* verify address validity */
1297 movq %rax,PCB_ONFAULT(%rcx)
1300 END(suword16_nosmap)
1302 ENTRY(suword16_smap)
1304 movq PCPU(CURPCB),%rcx
1305 movq $fusufault,PCB_ONFAULT(%rcx)
1307 movq $VM_MAXUSER_ADDRESS-2,%rax
1308 cmpq %rax,%rdi /* verify address validity */
1315 movq %rax,PCB_ONFAULT(%rcx)
1320 ENTRY(subyte_nosmap)
1322 movq PCPU(CURPCB),%rcx
1323 movq $fusufault,PCB_ONFAULT(%rcx)
1325 movq $VM_MAXUSER_ADDRESS-1,%rax
1326 cmpq %rax,%rdi /* verify address validity */
1332 movq %rax,PCB_ONFAULT(%rcx)
1339 movq PCPU(CURPCB),%rcx
1340 movq $fusufault,PCB_ONFAULT(%rcx)
1342 movq $VM_MAXUSER_ADDRESS-1,%rax
1343 cmpq %rax,%rdi /* verify address validity */
1351 movq %rax,PCB_ONFAULT(%rcx)
1358 testl $CPUID_STDEXT_SMAP,cpu_stdext_feature(%rip)
1361 1: movq PCPU(CURPCB),%rcx
1363 movq %rax,PCB_ONFAULT(%rcx)
1369 * copyinstr(from, to, maxlen, int *lencopied)
1370 * %rdi, %rsi, %rdx, %rcx
1372 * copy a string from 'from' to 'to', stop when a 0 character is reached.
1373 * return ENAMETOOLONG if string is longer than maxlen, and
1374 * EFAULT on protection violations. If lencopied is non-zero,
1375 * return the actual length in *lencopied.
1377 .macro COPYINSTR smap
1379 movq %rdx,%r8 /* %r8 = maxlen */
1380 movq PCPU(CURPCB),%r9
1381 movq $cpystrflt,PCB_ONFAULT(%r9)
1383 movq $VM_MAXUSER_ADDRESS,%rax
1385 /* make sure 'from' is within bounds */
1391 /* restrict maxlen to <= VM_MAXUSER_ADDRESS-from */
1399 jz copyinstr_toolong
1401 jz copyinstr_toolong_smap
1413 /* Success -- 0 byte reached */
1417 /* set *lencopied and return %eax */
1418 movq %rax,PCB_ONFAULT(%r9)
1435 ENTRY(copyinstr_nosmap)
1437 END(copyinstr_nosmap)
1439 ENTRY(copyinstr_smap)
1444 testl $CPUID_STDEXT_SMAP,cpu_stdext_feature(%rip)
1447 1: movl $EFAULT,%eax
1449 /* set *lencopied and return %eax */
1450 movq $0,PCB_ONFAULT(%r9)
1460 copyinstr_toolong_smap:
1463 /* rdx is zero - return ENAMETOOLONG or EFAULT */
1464 movq $VM_MAXUSER_ADDRESS,%rax
1467 movl $ENAMETOOLONG,%eax
1471 * Handling of special amd64 registers and descriptor tables etc
1473 /* void lgdt(struct region_descriptor *rdp); */
1475 /* reload the descriptor table */
1478 /* flush the prefetch q */
1485 movl %eax,%fs /* Beware, use wrmsr to set 64 bit base */
1489 /* reload code selector by turning return into intersegmental return */
1496 /*****************************************************************************/
1497 /* setjump, longjump */
1498 /*****************************************************************************/
1501 movq %rbx,0(%rdi) /* save rbx */
1502 movq %rsp,8(%rdi) /* save rsp */
1503 movq %rbp,16(%rdi) /* save rbp */
1504 movq %r12,24(%rdi) /* save r12 */
1505 movq %r13,32(%rdi) /* save r13 */
1506 movq %r14,40(%rdi) /* save r14 */
1507 movq %r15,48(%rdi) /* save r15 */
1508 movq 0(%rsp),%rdx /* get rta */
1509 movq %rdx,56(%rdi) /* save rip */
1510 xorl %eax,%eax /* return(0); */
1515 movq 0(%rdi),%rbx /* restore rbx */
1516 movq 8(%rdi),%rsp /* restore rsp */
1517 movq 16(%rdi),%rbp /* restore rbp */
1518 movq 24(%rdi),%r12 /* restore r12 */
1519 movq 32(%rdi),%r13 /* restore r13 */
1520 movq 40(%rdi),%r14 /* restore r14 */
1521 movq 48(%rdi),%r15 /* restore r15 */
1522 movq 56(%rdi),%rdx /* get rta */
1523 movq %rdx,0(%rsp) /* put in return frame */
1524 xorl %eax,%eax /* return(1); */
1530 * Support for reading MSRs in the safe manner. (Instead of panic on #gp,
1534 /* int rdmsr_safe(u_int msr, uint64_t *data) */
1536 movq PCPU(CURPCB),%r8
1537 movq $msr_onfault,PCB_ONFAULT(%r8)
1539 rdmsr /* Read MSR pointed by %ecx. Returns
1540 hi byte in edx, lo in %eax */
1541 salq $32,%rdx /* sign-shift %rdx left */
1542 movl %eax,%eax /* zero-extend %eax -> %rax */
1546 movq %rax,PCB_ONFAULT(%r8)
1551 * Support for writing MSRs in the safe manner. (Instead of panic on #gp,
1555 /* int wrmsr_safe(u_int msr, uint64_t data) */
1557 movq PCPU(CURPCB),%r8
1558 movq $msr_onfault,PCB_ONFAULT(%r8)
1563 wrmsr /* Write MSR pointed by %ecx. Accepts
1564 hi byte in edx, lo in %eax. */
1566 movq %rax,PCB_ONFAULT(%r8)
1571 * MSR operations fault handler
1575 movq $0,PCB_ONFAULT(%r8)
1581 * void pmap_pti_pcid_invalidate(uint64_t ucr3, uint64_t kcr3);
1582 * Invalidates address space addressed by ucr3, then returns to kcr3.
1583 * Done in assembler to ensure no other memory accesses happen while
1587 ENTRY(pmap_pti_pcid_invalidate)
1590 movq %rdi,%cr3 /* to user page table */
1591 movq %rsi,%cr3 /* back to kernel */
1596 * void pmap_pti_pcid_invlpg(uint64_t ucr3, uint64_t kcr3, vm_offset_t va);
1597 * Invalidates virtual address va in address space ucr3, then returns to kcr3.
1600 ENTRY(pmap_pti_pcid_invlpg)
1603 movq %rdi,%cr3 /* to user page table */
1605 movq %rsi,%cr3 /* back to kernel */
1610 * void pmap_pti_pcid_invlrng(uint64_t ucr3, uint64_t kcr3, vm_offset_t sva,
1612 * Invalidates virtual addresses between sva and eva in address space ucr3,
1613 * then returns to kcr3.
1616 ENTRY(pmap_pti_pcid_invlrng)
1619 movq %rdi,%cr3 /* to user page table */
1621 addq $PAGE_SIZE,%rdx
1624 movq %rsi,%cr3 /* back to kernel */
1629 .macro rsb_seq_label l
1632 .macro rsb_call_label l
1635 .macro rsb_seq count
1638 rsb_call_label %(ll)
1650 /* all callers already saved %rax, %rdx, and %rcx */
1651 ENTRY(handle_ibrs_entry)
1652 cmpb $0,hw_ibrs_ibpb_active(%rip)
1654 movl $MSR_IA32_SPEC_CTRL,%ecx
1656 orl $(IA32_SPEC_CTRL_IBRS|IA32_SPEC_CTRL_STIBP),%eax
1657 orl $(IA32_SPEC_CTRL_IBRS|IA32_SPEC_CTRL_STIBP)>>32,%edx
1659 movb $1,PCPU(IBPB_SET)
1660 testl $CPUID_STDEXT_SMEP,cpu_stdext_feature(%rip)
1663 END(handle_ibrs_entry)
1665 ENTRY(handle_ibrs_exit)
1666 cmpb $0,PCPU(IBPB_SET)
1668 movl $MSR_IA32_SPEC_CTRL,%ecx
1670 andl $~(IA32_SPEC_CTRL_IBRS|IA32_SPEC_CTRL_STIBP),%eax
1671 andl $~((IA32_SPEC_CTRL_IBRS|IA32_SPEC_CTRL_STIBP)>>32),%edx
1673 movb $0,PCPU(IBPB_SET)
1675 END(handle_ibrs_exit)
1677 /* registers-neutral version, but needs stack */
1678 ENTRY(handle_ibrs_exit_rs)
1679 cmpb $0,PCPU(IBPB_SET)
1684 movl $MSR_IA32_SPEC_CTRL,%ecx
1686 andl $~(IA32_SPEC_CTRL_IBRS|IA32_SPEC_CTRL_STIBP),%eax
1687 andl $~((IA32_SPEC_CTRL_IBRS|IA32_SPEC_CTRL_STIBP)>>32),%edx
1692 movb $0,PCPU(IBPB_SET)
1694 END(handle_ibrs_exit_rs)
1699 * Flush L1D cache. Load enough of the data from the kernel text
1700 * to flush existing L1D content.
1702 * N.B. The function does not follow ABI calling conventions, it corrupts %rbx.
1703 * The vmm.ko caller expects that only %rax, %rdx, %rbx, %rcx, %r9, and %rflags
1704 * registers are clobbered. The NMI handler caller only needs %r13 and %r15
1708 #define L1D_FLUSH_SIZE (64 * 1024)
1710 movq $-L1D_FLUSH_SIZE, %rcx
1712 * pass 1: Preload TLB.
1713 * Kernel text is mapped using superpages. TLB preload is
1714 * done for the benefit of older CPUs which split 2M page
1715 * into 4k TLB entries.
1717 1: movb L1D_FLUSH_SIZE(%r9, %rcx), %al
1718 addq $PAGE_SIZE, %rcx
1722 movq $-L1D_FLUSH_SIZE, %rcx
1723 /* pass 2: Read each cache line. */
1724 2: movb L1D_FLUSH_SIZE(%r9, %rcx), %al
1729 #undef L1D_FLUSH_SIZE
1732 ENTRY(flush_l1d_sw_abi)
1737 END(flush_l1d_sw_abi)
1739 ENTRY(mds_handler_void)
1741 END(mds_handler_void)
1743 ENTRY(mds_handler_verw)
1749 END(mds_handler_verw)
1751 ENTRY(mds_handler_ivb)
1760 1: movq PCPU(MDS_BUF), %rdx
1761 movdqa %xmm0, PCPU(MDS_TMP)
1770 2: movntdq %xmm0, (%rdx)
1776 movdqa PCPU(MDS_TMP),%xmm0
1784 END(mds_handler_ivb)
1786 ENTRY(mds_handler_bdw)
1797 1: movq PCPU(MDS_BUF), %rbx
1798 movdqa %xmm0, PCPU(MDS_TMP)
1804 2: movntdq %xmm0, (%rbx)
1813 movdqa PCPU(MDS_TMP),%xmm0
1823 END(mds_handler_bdw)
1825 ENTRY(mds_handler_skl_sse)
1835 1: movq PCPU(MDS_BUF), %rdi
1836 movq PCPU(MDS_BUF64), %rdx
1837 movdqa %xmm0, PCPU(MDS_TMP)
1844 2: clflushopt 5376(%rdi, %rax, 8)
1854 movdqa PCPU(MDS_TMP), %xmm0
1863 END(mds_handler_skl_sse)
1865 ENTRY(mds_handler_skl_avx)
1875 1: movq PCPU(MDS_BUF), %rdi
1876 movq PCPU(MDS_BUF64), %rdx
1877 vmovdqa %ymm0, PCPU(MDS_TMP)
1878 vpxor %ymm0, %ymm0, %ymm0
1881 vorpd (%rdx), %ymm0, %ymm0
1882 vorpd (%rdx), %ymm0, %ymm0
1884 2: clflushopt 5376(%rdi, %rax, 8)
1894 vmovdqa PCPU(MDS_TMP), %ymm0
1903 END(mds_handler_skl_avx)
1905 ENTRY(mds_handler_skl_avx512)
1915 1: movq PCPU(MDS_BUF), %rdi
1916 movq PCPU(MDS_BUF64), %rdx
1917 vmovdqa64 %zmm0, PCPU(MDS_TMP)
1918 vpxord %zmm0, %zmm0, %zmm0
1921 vorpd (%rdx), %zmm0, %zmm0
1922 vorpd (%rdx), %zmm0, %zmm0
1924 2: clflushopt 5376(%rdi, %rax, 8)
1934 vmovdqa64 PCPU(MDS_TMP), %zmm0
1943 END(mds_handler_skl_avx512)
1945 ENTRY(mds_handler_silvermont)
1954 1: movq PCPU(MDS_BUF), %rdx
1955 movdqa %xmm0, PCPU(MDS_TMP)
1959 2: movntdq %xmm0, (%rdx)
1965 movdqa PCPU(MDS_TMP),%xmm0
1973 END(mds_handler_silvermont)