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/*- * Copyright (c) 2003 Peter Wemm. * Copyright (c) 1993 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: release/9.1.0/sys/amd64/amd64/support.S 224187 2011-07-18 15:19:40Z attilio $ */ #include "opt_ddb.h" #include <machine/asmacros.h> #include <machine/intr_machdep.h> #include <machine/pmap.h> #include "assym.s" .text /* * bcopy family * void bzero(void *buf, u_int len) */ /* done */ ENTRY(bzero) movq %rsi,%rcx xorl %eax,%eax shrq $3,%rcx cld rep stosq movq %rsi,%rcx andq $7,%rcx rep stosb ret END(bzero) /* Address: %rdi */ ENTRY(pagezero) movq $-PAGE_SIZE,%rdx subq %rdx,%rdi xorl %eax,%eax 1: movnti %rax,(%rdi,%rdx) movnti %rax,8(%rdi,%rdx) movnti %rax,16(%rdi,%rdx) movnti %rax,24(%rdi,%rdx) addq $32,%rdx jne 1b sfence ret END(pagezero) ENTRY(bcmp) movq %rdx,%rcx shrq $3,%rcx cld /* compare forwards */ repe cmpsq jne 1f movq %rdx,%rcx andq $7,%rcx repe cmpsb 1: setne %al movsbl %al,%eax ret END(bcmp) /* * bcopy(src, dst, cnt) * rdi, rsi, rdx * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 */ ENTRY(bcopy) xchgq %rsi,%rdi movq %rdx,%rcx movq %rdi,%rax subq %rsi,%rax cmpq %rcx,%rax /* overlapping && src < dst? */ jb 1f shrq $3,%rcx /* copy by 64-bit words */ cld /* nope, copy forwards */ rep movsq movq %rdx,%rcx andq $7,%rcx /* any bytes left? */ rep movsb ret /* ALIGN_TEXT */ 1: addq %rcx,%rdi /* copy backwards */ addq %rcx,%rsi decq %rdi decq %rsi andq $7,%rcx /* any fractional bytes? */ std rep movsb movq %rdx,%rcx /* copy remainder by 32-bit words */ shrq $3,%rcx subq $7,%rsi subq $7,%rdi rep movsq cld ret END(bcopy) /* * Note: memcpy does not support overlapping copies */ ENTRY(memcpy) movq %rdx,%rcx shrq $3,%rcx /* copy by 64-bit words */ cld /* copy forwards */ rep movsq movq %rdx,%rcx andq $7,%rcx /* any bytes left? */ rep movsb ret END(memcpy) /* * pagecopy(%rdi=from, %rsi=to) */ ENTRY(pagecopy) movq $-PAGE_SIZE,%rax movq %rax,%rdx subq %rax,%rdi subq %rax,%rsi 1: prefetchnta (%rdi,%rax) addq $64,%rax jne 1b 2: movq (%rdi,%rdx),%rax movnti %rax,(%rsi,%rdx) movq 8(%rdi,%rdx),%rax movnti %rax,8(%rsi,%rdx) movq 16(%rdi,%rdx),%rax movnti %rax,16(%rsi,%rdx) movq 24(%rdi,%rdx),%rax movnti %rax,24(%rsi,%rdx) addq $32,%rdx jne 2b sfence ret END(pagecopy) /* fillw(pat, base, cnt) */ /* %rdi,%rsi, %rdx */ ENTRY(fillw) movq %rdi,%rax movq %rsi,%rdi movq %rdx,%rcx cld rep stosw ret END(fillw) /*****************************************************************************/ /* copyout and fubyte family */ /*****************************************************************************/ /* * Access user memory from inside the kernel. These routines should be * the only places that do this. * * These routines set curpcb->onfault for the time they execute. When a * protection violation occurs inside the functions, the trap handler * returns to *curpcb->onfault instead of the function. */ /* * copyout(from_kernel, to_user, len) - MP SAFE * %rdi, %rsi, %rdx */ ENTRY(copyout) movq PCPU(CURPCB),%rax movq $copyout_fault,PCB_ONFAULT(%rax) testq %rdx,%rdx /* anything to do? */ jz done_copyout /* * Check explicitly for non-user addresses. If 486 write protection * is being used, this check is essential because we are in kernel * mode so the h/w does not provide any protection against writing * kernel addresses. */ /* * First, prevent address wrapping. */ movq %rsi,%rax addq %rdx,%rax jc copyout_fault /* * XXX STOP USING VM_MAXUSER_ADDRESS. * It is an end address, not a max, so every time it is used correctly it * looks like there is an off by one error, and of course it caused an off * by one error in several places. */ movq $VM_MAXUSER_ADDRESS,%rcx cmpq %rcx,%rax ja copyout_fault xchgq %rdi,%rsi /* bcopy(%rsi, %rdi, %rdx) */ movq %rdx,%rcx shrq $3,%rcx cld rep movsq movb %dl,%cl andb $7,%cl rep movsb done_copyout: xorl %eax,%eax movq PCPU(CURPCB),%rdx movq %rax,PCB_ONFAULT(%rdx) ret ALIGN_TEXT copyout_fault: movq PCPU(CURPCB),%rdx movq $0,PCB_ONFAULT(%rdx) movq $EFAULT,%rax ret END(copyout) /* * copyin(from_user, to_kernel, len) - MP SAFE * %rdi, %rsi, %rdx */ ENTRY(copyin) movq PCPU(CURPCB),%rax movq $copyin_fault,PCB_ONFAULT(%rax) testq %rdx,%rdx /* anything to do? */ jz done_copyin /* * make sure address is valid */ movq %rdi,%rax addq %rdx,%rax jc copyin_fault movq $VM_MAXUSER_ADDRESS,%rcx cmpq %rcx,%rax ja copyin_fault xchgq %rdi,%rsi movq %rdx,%rcx movb %cl,%al shrq $3,%rcx /* copy longword-wise */ cld rep movsq movb %al,%cl andb $7,%cl /* copy remaining bytes */ rep movsb done_copyin: xorl %eax,%eax movq PCPU(CURPCB),%rdx movq %rax,PCB_ONFAULT(%rdx) ret ALIGN_TEXT copyin_fault: movq PCPU(CURPCB),%rdx movq $0,PCB_ONFAULT(%rdx) movq $EFAULT,%rax ret END(copyin) /* * casuword32. Compare and set user integer. Returns -1 or the current value. * dst = %rdi, old = %rsi, new = %rdx */ ENTRY(casuword32) movq PCPU(CURPCB),%rcx movq $fusufault,PCB_ONFAULT(%rcx) movq $VM_MAXUSER_ADDRESS-4,%rax cmpq %rax,%rdi /* verify address is valid */ ja fusufault movl %esi,%eax /* old */ #ifdef SMP lock #endif cmpxchgl %edx,(%rdi) /* new = %edx */ /* * The old value is in %eax. If the store succeeded it will be the * value we expected (old) from before the store, otherwise it will * be the current value. */ movq PCPU(CURPCB),%rcx movq $0,PCB_ONFAULT(%rcx) ret END(casuword32) /* * casuword. Compare and set user word. Returns -1 or the current value. * dst = %rdi, old = %rsi, new = %rdx */ ENTRY(casuword) movq PCPU(CURPCB),%rcx movq $fusufault,PCB_ONFAULT(%rcx) movq $VM_MAXUSER_ADDRESS-4,%rax cmpq %rax,%rdi /* verify address is valid */ ja fusufault movq %rsi,%rax /* old */ #ifdef SMP lock #endif cmpxchgq %rdx,(%rdi) /* new = %rdx */ /* * The old value is in %eax. If the store succeeded it will be the * value we expected (old) from before the store, otherwise it will * be the current value. */ movq PCPU(CURPCB),%rcx movq $fusufault,PCB_ONFAULT(%rcx) movq $0,PCB_ONFAULT(%rcx) ret END(casuword) /* * Fetch (load) a 64-bit word, a 32-bit word, a 16-bit word, or an 8-bit * byte from user memory. All these functions are MPSAFE. * addr = %rdi */ ALTENTRY(fuword64) ENTRY(fuword) movq PCPU(CURPCB),%rcx movq $fusufault,PCB_ONFAULT(%rcx) movq $VM_MAXUSER_ADDRESS-8,%rax cmpq %rax,%rdi /* verify address is valid */ ja fusufault movq (%rdi),%rax movq $0,PCB_ONFAULT(%rcx) ret END(fuword64) END(fuword) ENTRY(fuword32) movq PCPU(CURPCB),%rcx movq $fusufault,PCB_ONFAULT(%rcx) movq $VM_MAXUSER_ADDRESS-4,%rax cmpq %rax,%rdi /* verify address is valid */ ja fusufault movl (%rdi),%eax movq $0,PCB_ONFAULT(%rcx) ret END(fuword32) /* * fuswintr() and suswintr() are specialized variants of fuword16() and * suword16(), respectively. They are called from the profiling code, * potentially at interrupt time. If they fail, that's okay; good things * will happen later. They always fail for now, until the trap code is * able to deal with this. */ ALTENTRY(suswintr) ENTRY(fuswintr) movq $-1,%rax ret END(suswintr) END(fuswintr) ENTRY(fuword16) movq PCPU(CURPCB),%rcx movq $fusufault,PCB_ONFAULT(%rcx) movq $VM_MAXUSER_ADDRESS-2,%rax cmpq %rax,%rdi ja fusufault movzwl (%rdi),%eax movq $0,PCB_ONFAULT(%rcx) ret END(fuword16) ENTRY(fubyte) movq PCPU(CURPCB),%rcx movq $fusufault,PCB_ONFAULT(%rcx) movq $VM_MAXUSER_ADDRESS-1,%rax cmpq %rax,%rdi ja fusufault movzbl (%rdi),%eax movq $0,PCB_ONFAULT(%rcx) ret END(fubyte) ALIGN_TEXT fusufault: movq PCPU(CURPCB),%rcx xorl %eax,%eax movq %rax,PCB_ONFAULT(%rcx) decq %rax ret /* * Store a 64-bit word, a 32-bit word, a 16-bit word, or an 8-bit byte to * user memory. All these functions are MPSAFE. * addr = %rdi, value = %rsi */ ALTENTRY(suword64) ENTRY(suword) movq PCPU(CURPCB),%rcx movq $fusufault,PCB_ONFAULT(%rcx) movq $VM_MAXUSER_ADDRESS-8,%rax cmpq %rax,%rdi /* verify address validity */ ja fusufault movq %rsi,(%rdi) xorl %eax,%eax movq PCPU(CURPCB),%rcx movq %rax,PCB_ONFAULT(%rcx) ret END(suword64) END(suword) ENTRY(suword32) movq PCPU(CURPCB),%rcx movq $fusufault,PCB_ONFAULT(%rcx) movq $VM_MAXUSER_ADDRESS-4,%rax cmpq %rax,%rdi /* verify address validity */ ja fusufault movl %esi,(%rdi) xorl %eax,%eax movq PCPU(CURPCB),%rcx movq %rax,PCB_ONFAULT(%rcx) ret END(suword32) ENTRY(suword16) movq PCPU(CURPCB),%rcx movq $fusufault,PCB_ONFAULT(%rcx) movq $VM_MAXUSER_ADDRESS-2,%rax cmpq %rax,%rdi /* verify address validity */ ja fusufault movw %si,(%rdi) xorl %eax,%eax movq PCPU(CURPCB),%rcx /* restore trashed register */ movq %rax,PCB_ONFAULT(%rcx) ret END(suword16) ENTRY(subyte) movq PCPU(CURPCB),%rcx movq $fusufault,PCB_ONFAULT(%rcx) movq $VM_MAXUSER_ADDRESS-1,%rax cmpq %rax,%rdi /* verify address validity */ ja fusufault movl %esi,%eax movb %al,(%rdi) xorl %eax,%eax movq PCPU(CURPCB),%rcx /* restore trashed register */ movq %rax,PCB_ONFAULT(%rcx) ret END(subyte) /* * copyinstr(from, to, maxlen, int *lencopied) - MP SAFE * %rdi, %rsi, %rdx, %rcx * * copy a string from from to to, stop when a 0 character is reached. * return ENAMETOOLONG if string is longer than maxlen, and * EFAULT on protection violations. If lencopied is non-zero, * return the actual length in *lencopied. */ ENTRY(copyinstr) movq %rdx,%r8 /* %r8 = maxlen */ movq %rcx,%r9 /* %r9 = *len */ xchgq %rdi,%rsi /* %rdi = from, %rsi = to */ movq PCPU(CURPCB),%rcx movq $cpystrflt,PCB_ONFAULT(%rcx) movq $VM_MAXUSER_ADDRESS,%rax /* make sure 'from' is within bounds */ subq %rsi,%rax jbe cpystrflt /* restrict maxlen to <= VM_MAXUSER_ADDRESS-from */ cmpq %rdx,%rax jae 1f movq %rax,%rdx movq %rax,%r8 1: incq %rdx cld 2: decq %rdx jz 3f lodsb stosb orb %al,%al jnz 2b /* Success -- 0 byte reached */ decq %rdx xorl %eax,%eax jmp cpystrflt_x 3: /* rdx is zero - return ENAMETOOLONG or EFAULT */ movq $VM_MAXUSER_ADDRESS,%rax cmpq %rax,%rsi jae cpystrflt 4: movq $ENAMETOOLONG,%rax jmp cpystrflt_x cpystrflt: movq $EFAULT,%rax cpystrflt_x: /* set *lencopied and return %eax */ movq PCPU(CURPCB),%rcx movq $0,PCB_ONFAULT(%rcx) testq %r9,%r9 jz 1f subq %rdx,%r8 movq %r8,(%r9) 1: ret END(copyinstr) /* * copystr(from, to, maxlen, int *lencopied) - MP SAFE * %rdi, %rsi, %rdx, %rcx */ ENTRY(copystr) movq %rdx,%r8 /* %r8 = maxlen */ xchgq %rdi,%rsi incq %rdx cld 1: decq %rdx jz 4f lodsb stosb orb %al,%al jnz 1b /* Success -- 0 byte reached */ decq %rdx xorl %eax,%eax jmp 6f 4: /* rdx is zero -- return ENAMETOOLONG */ movq $ENAMETOOLONG,%rax 6: testq %rcx,%rcx jz 7f /* set *lencopied and return %rax */ subq %rdx,%r8 movq %r8,(%rcx) 7: ret END(copystr) /* * Handling of special amd64 registers and descriptor tables etc * %rdi */ /* void lgdt(struct region_descriptor *rdp); */ ENTRY(lgdt) /* reload the descriptor table */ lgdt (%rdi) /* flush the prefetch q */ jmp 1f nop 1: movl $KDSEL,%eax movl %eax,%ds movl %eax,%es movl %eax,%fs /* Beware, use wrmsr to set 64 bit base */ movl %eax,%gs movl %eax,%ss /* reload code selector by turning return into intersegmental return */ popq %rax pushq $KCSEL pushq %rax MEXITCOUNT lretq END(lgdt) /*****************************************************************************/ /* setjump, longjump */ /*****************************************************************************/ ENTRY(setjmp) movq %rbx,0(%rdi) /* save rbx */ movq %rsp,8(%rdi) /* save rsp */ movq %rbp,16(%rdi) /* save rbp */ movq %r12,24(%rdi) /* save r12 */ movq %r13,32(%rdi) /* save r13 */ movq %r14,40(%rdi) /* save r14 */ movq %r15,48(%rdi) /* save r15 */ movq 0(%rsp),%rdx /* get rta */ movq %rdx,56(%rdi) /* save rip */ xorl %eax,%eax /* return(0); */ ret END(setjmp) ENTRY(longjmp) movq 0(%rdi),%rbx /* restore rbx */ movq 8(%rdi),%rsp /* restore rsp */ movq 16(%rdi),%rbp /* restore rbp */ movq 24(%rdi),%r12 /* restore r12 */ movq 32(%rdi),%r13 /* restore r13 */ movq 40(%rdi),%r14 /* restore r14 */ movq 48(%rdi),%r15 /* restore r15 */ movq 56(%rdi),%rdx /* get rta */ movq %rdx,0(%rsp) /* put in return frame */ xorl %eax,%eax /* return(1); */ incl %eax ret END(longjmp) /* * Support for reading MSRs in the safe manner. */ ENTRY(rdmsr_safe) /* int rdmsr_safe(u_int msr, uint64_t *data) */ movq PCPU(CURPCB),%r8 movq $msr_onfault,PCB_ONFAULT(%r8) movl %edi,%ecx rdmsr /* Read MSR pointed by %ecx. Returns hi byte in edx, lo in %eax */ salq $32,%rdx /* sign-shift %rdx left */ movl %eax,%eax /* zero-extend %eax -> %rax */ orq %rdx,%rax movq %rax,(%rsi) xorq %rax,%rax movq %rax,PCB_ONFAULT(%r8) ret /* * Support for writing MSRs in the safe manner. */ ENTRY(wrmsr_safe) /* int wrmsr_safe(u_int msr, uint64_t data) */ movq PCPU(CURPCB),%r8 movq $msr_onfault,PCB_ONFAULT(%r8) movl %edi,%ecx movl %esi,%eax sarq $32,%rsi movl %esi,%edx wrmsr /* Write MSR pointed by %ecx. Accepts hi byte in edx, lo in %eax. */ xorq %rax,%rax movq %rax,PCB_ONFAULT(%r8) ret /* * MSR operations fault handler */ ALIGN_TEXT msr_onfault: movq $0,PCB_ONFAULT(%r8) movl $EFAULT,%eax ret