mirror of
https://github.com/edk2-porting/linux-next.git
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6dcc5627f6
These are all functions which are invoked from elsewhere, so annotate them as global using the new SYM_FUNC_START and their ENDPROC's by SYM_FUNC_END. Make sure ENTRY/ENDPROC is not defined on X86_64, given these were the last users. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [hibernate] Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> [xen bits] Acked-by: Herbert Xu <herbert@gondor.apana.org.au> [crypto] Cc: Allison Randal <allison@lohutok.net> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Andy Shevchenko <andy@infradead.org> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Armijn Hemel <armijn@tjaldur.nl> Cc: Cao jin <caoj.fnst@cn.fujitsu.com> Cc: Darren Hart <dvhart@infradead.org> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Enrico Weigelt <info@metux.net> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jim Mattson <jmattson@google.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Juergen Gross <jgross@suse.com> Cc: Kate Stewart <kstewart@linuxfoundation.org> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: kvm ML <kvm@vger.kernel.org> Cc: Len Brown <len.brown@intel.com> Cc: linux-arch@vger.kernel.org Cc: linux-crypto@vger.kernel.org Cc: linux-efi <linux-efi@vger.kernel.org> Cc: linux-efi@vger.kernel.org Cc: linux-pm@vger.kernel.org Cc: Mark Rutland <mark.rutland@arm.com> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: Peter Zijlstra <peterz@infradead.org> Cc: platform-driver-x86@vger.kernel.org Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Sean Christopherson <sean.j.christopherson@intel.com> Cc: Stefano Stabellini <sstabellini@kernel.org> Cc: "Steven Rostedt (VMware)" <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Cc: Wanpeng Li <wanpengli@tencent.com> Cc: Wei Huang <wei@redhat.com> Cc: x86-ml <x86@kernel.org> Cc: xen-devel@lists.xenproject.org Cc: Xiaoyao Li <xiaoyao.li@linux.intel.com> Link: https://lkml.kernel.org/r/20191011115108.12392-25-jslaby@suse.cz
393 lines
8.8 KiB
ArmAsm
393 lines
8.8 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright 2008 Vitaly Mayatskikh <vmayatsk@redhat.com>
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* Copyright 2002 Andi Kleen, SuSE Labs.
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*
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* Functions to copy from and to user space.
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*/
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#include <linux/linkage.h>
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#include <asm/current.h>
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#include <asm/asm-offsets.h>
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#include <asm/thread_info.h>
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#include <asm/cpufeatures.h>
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#include <asm/alternative-asm.h>
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#include <asm/asm.h>
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#include <asm/smap.h>
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#include <asm/export.h>
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.macro ALIGN_DESTINATION
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/* check for bad alignment of destination */
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movl %edi,%ecx
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andl $7,%ecx
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jz 102f /* already aligned */
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subl $8,%ecx
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negl %ecx
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subl %ecx,%edx
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100: movb (%rsi),%al
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101: movb %al,(%rdi)
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incq %rsi
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incq %rdi
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decl %ecx
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jnz 100b
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102:
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.section .fixup,"ax"
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103: addl %ecx,%edx /* ecx is zerorest also */
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jmp .Lcopy_user_handle_tail
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.previous
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_ASM_EXTABLE_UA(100b, 103b)
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_ASM_EXTABLE_UA(101b, 103b)
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.endm
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/*
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* copy_user_generic_unrolled - memory copy with exception handling.
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* This version is for CPUs like P4 that don't have efficient micro
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* code for rep movsq
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*
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* Input:
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* rdi destination
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* rsi source
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* rdx count
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*
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* Output:
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* eax uncopied bytes or 0 if successful.
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*/
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SYM_FUNC_START(copy_user_generic_unrolled)
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ASM_STAC
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cmpl $8,%edx
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jb 20f /* less then 8 bytes, go to byte copy loop */
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ALIGN_DESTINATION
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movl %edx,%ecx
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andl $63,%edx
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shrl $6,%ecx
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jz .L_copy_short_string
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1: movq (%rsi),%r8
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2: movq 1*8(%rsi),%r9
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3: movq 2*8(%rsi),%r10
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4: movq 3*8(%rsi),%r11
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5: movq %r8,(%rdi)
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6: movq %r9,1*8(%rdi)
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7: movq %r10,2*8(%rdi)
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8: movq %r11,3*8(%rdi)
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9: movq 4*8(%rsi),%r8
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10: movq 5*8(%rsi),%r9
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11: movq 6*8(%rsi),%r10
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12: movq 7*8(%rsi),%r11
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13: movq %r8,4*8(%rdi)
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14: movq %r9,5*8(%rdi)
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15: movq %r10,6*8(%rdi)
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16: movq %r11,7*8(%rdi)
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leaq 64(%rsi),%rsi
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leaq 64(%rdi),%rdi
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decl %ecx
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jnz 1b
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.L_copy_short_string:
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movl %edx,%ecx
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andl $7,%edx
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shrl $3,%ecx
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jz 20f
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18: movq (%rsi),%r8
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19: movq %r8,(%rdi)
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leaq 8(%rsi),%rsi
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leaq 8(%rdi),%rdi
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decl %ecx
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jnz 18b
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20: andl %edx,%edx
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jz 23f
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movl %edx,%ecx
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21: movb (%rsi),%al
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22: movb %al,(%rdi)
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incq %rsi
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incq %rdi
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decl %ecx
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jnz 21b
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23: xor %eax,%eax
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ASM_CLAC
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ret
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.section .fixup,"ax"
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30: shll $6,%ecx
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addl %ecx,%edx
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jmp 60f
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40: leal (%rdx,%rcx,8),%edx
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jmp 60f
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50: movl %ecx,%edx
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60: jmp .Lcopy_user_handle_tail /* ecx is zerorest also */
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.previous
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_ASM_EXTABLE_UA(1b, 30b)
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_ASM_EXTABLE_UA(2b, 30b)
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_ASM_EXTABLE_UA(3b, 30b)
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_ASM_EXTABLE_UA(4b, 30b)
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_ASM_EXTABLE_UA(5b, 30b)
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_ASM_EXTABLE_UA(6b, 30b)
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_ASM_EXTABLE_UA(7b, 30b)
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_ASM_EXTABLE_UA(8b, 30b)
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_ASM_EXTABLE_UA(9b, 30b)
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_ASM_EXTABLE_UA(10b, 30b)
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_ASM_EXTABLE_UA(11b, 30b)
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_ASM_EXTABLE_UA(12b, 30b)
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_ASM_EXTABLE_UA(13b, 30b)
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_ASM_EXTABLE_UA(14b, 30b)
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_ASM_EXTABLE_UA(15b, 30b)
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_ASM_EXTABLE_UA(16b, 30b)
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_ASM_EXTABLE_UA(18b, 40b)
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_ASM_EXTABLE_UA(19b, 40b)
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_ASM_EXTABLE_UA(21b, 50b)
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_ASM_EXTABLE_UA(22b, 50b)
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SYM_FUNC_END(copy_user_generic_unrolled)
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EXPORT_SYMBOL(copy_user_generic_unrolled)
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/* Some CPUs run faster using the string copy instructions.
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* This is also a lot simpler. Use them when possible.
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*
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* Only 4GB of copy is supported. This shouldn't be a problem
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* because the kernel normally only writes from/to page sized chunks
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* even if user space passed a longer buffer.
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* And more would be dangerous because both Intel and AMD have
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* errata with rep movsq > 4GB. If someone feels the need to fix
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* this please consider this.
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*
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* Input:
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* rdi destination
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* rsi source
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* rdx count
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*
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* Output:
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* eax uncopied bytes or 0 if successful.
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*/
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SYM_FUNC_START(copy_user_generic_string)
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ASM_STAC
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cmpl $8,%edx
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jb 2f /* less than 8 bytes, go to byte copy loop */
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ALIGN_DESTINATION
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movl %edx,%ecx
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shrl $3,%ecx
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andl $7,%edx
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1: rep
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movsq
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2: movl %edx,%ecx
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3: rep
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movsb
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xorl %eax,%eax
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ASM_CLAC
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ret
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.section .fixup,"ax"
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11: leal (%rdx,%rcx,8),%ecx
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12: movl %ecx,%edx /* ecx is zerorest also */
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jmp .Lcopy_user_handle_tail
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.previous
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_ASM_EXTABLE_UA(1b, 11b)
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_ASM_EXTABLE_UA(3b, 12b)
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SYM_FUNC_END(copy_user_generic_string)
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EXPORT_SYMBOL(copy_user_generic_string)
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/*
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* Some CPUs are adding enhanced REP MOVSB/STOSB instructions.
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* It's recommended to use enhanced REP MOVSB/STOSB if it's enabled.
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*
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* Input:
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* rdi destination
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* rsi source
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* rdx count
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*
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* Output:
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* eax uncopied bytes or 0 if successful.
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*/
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SYM_FUNC_START(copy_user_enhanced_fast_string)
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ASM_STAC
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cmpl $64,%edx
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jb .L_copy_short_string /* less then 64 bytes, avoid the costly 'rep' */
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movl %edx,%ecx
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1: rep
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movsb
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xorl %eax,%eax
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ASM_CLAC
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ret
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.section .fixup,"ax"
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12: movl %ecx,%edx /* ecx is zerorest also */
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jmp .Lcopy_user_handle_tail
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.previous
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_ASM_EXTABLE_UA(1b, 12b)
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SYM_FUNC_END(copy_user_enhanced_fast_string)
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EXPORT_SYMBOL(copy_user_enhanced_fast_string)
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/*
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* Try to copy last bytes and clear the rest if needed.
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* Since protection fault in copy_from/to_user is not a normal situation,
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* it is not necessary to optimize tail handling.
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*
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* Input:
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* rdi destination
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* rsi source
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* rdx count
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*
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* Output:
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* eax uncopied bytes or 0 if successful.
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*/
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SYM_CODE_START_LOCAL(.Lcopy_user_handle_tail)
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movl %edx,%ecx
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1: rep movsb
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2: mov %ecx,%eax
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ASM_CLAC
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ret
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_ASM_EXTABLE_UA(1b, 2b)
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SYM_CODE_END(.Lcopy_user_handle_tail)
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/*
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* copy_user_nocache - Uncached memory copy with exception handling
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* This will force destination out of cache for more performance.
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*
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* Note: Cached memory copy is used when destination or size is not
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* naturally aligned. That is:
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* - Require 8-byte alignment when size is 8 bytes or larger.
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* - Require 4-byte alignment when size is 4 bytes.
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*/
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SYM_FUNC_START(__copy_user_nocache)
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ASM_STAC
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/* If size is less than 8 bytes, go to 4-byte copy */
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cmpl $8,%edx
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jb .L_4b_nocache_copy_entry
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/* If destination is not 8-byte aligned, "cache" copy to align it */
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ALIGN_DESTINATION
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/* Set 4x8-byte copy count and remainder */
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movl %edx,%ecx
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andl $63,%edx
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shrl $6,%ecx
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jz .L_8b_nocache_copy_entry /* jump if count is 0 */
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/* Perform 4x8-byte nocache loop-copy */
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.L_4x8b_nocache_copy_loop:
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1: movq (%rsi),%r8
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2: movq 1*8(%rsi),%r9
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3: movq 2*8(%rsi),%r10
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4: movq 3*8(%rsi),%r11
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5: movnti %r8,(%rdi)
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6: movnti %r9,1*8(%rdi)
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7: movnti %r10,2*8(%rdi)
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8: movnti %r11,3*8(%rdi)
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9: movq 4*8(%rsi),%r8
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10: movq 5*8(%rsi),%r9
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11: movq 6*8(%rsi),%r10
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12: movq 7*8(%rsi),%r11
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13: movnti %r8,4*8(%rdi)
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14: movnti %r9,5*8(%rdi)
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15: movnti %r10,6*8(%rdi)
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16: movnti %r11,7*8(%rdi)
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leaq 64(%rsi),%rsi
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leaq 64(%rdi),%rdi
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decl %ecx
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jnz .L_4x8b_nocache_copy_loop
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/* Set 8-byte copy count and remainder */
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.L_8b_nocache_copy_entry:
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movl %edx,%ecx
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andl $7,%edx
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shrl $3,%ecx
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jz .L_4b_nocache_copy_entry /* jump if count is 0 */
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/* Perform 8-byte nocache loop-copy */
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.L_8b_nocache_copy_loop:
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20: movq (%rsi),%r8
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21: movnti %r8,(%rdi)
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leaq 8(%rsi),%rsi
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leaq 8(%rdi),%rdi
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decl %ecx
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jnz .L_8b_nocache_copy_loop
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/* If no byte left, we're done */
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.L_4b_nocache_copy_entry:
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andl %edx,%edx
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jz .L_finish_copy
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/* If destination is not 4-byte aligned, go to byte copy: */
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movl %edi,%ecx
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andl $3,%ecx
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jnz .L_1b_cache_copy_entry
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/* Set 4-byte copy count (1 or 0) and remainder */
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movl %edx,%ecx
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andl $3,%edx
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shrl $2,%ecx
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jz .L_1b_cache_copy_entry /* jump if count is 0 */
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/* Perform 4-byte nocache copy: */
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30: movl (%rsi),%r8d
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31: movnti %r8d,(%rdi)
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leaq 4(%rsi),%rsi
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leaq 4(%rdi),%rdi
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/* If no bytes left, we're done: */
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andl %edx,%edx
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jz .L_finish_copy
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/* Perform byte "cache" loop-copy for the remainder */
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.L_1b_cache_copy_entry:
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movl %edx,%ecx
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.L_1b_cache_copy_loop:
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40: movb (%rsi),%al
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41: movb %al,(%rdi)
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incq %rsi
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incq %rdi
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decl %ecx
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jnz .L_1b_cache_copy_loop
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/* Finished copying; fence the prior stores */
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.L_finish_copy:
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xorl %eax,%eax
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ASM_CLAC
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sfence
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ret
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.section .fixup,"ax"
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.L_fixup_4x8b_copy:
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shll $6,%ecx
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addl %ecx,%edx
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jmp .L_fixup_handle_tail
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.L_fixup_8b_copy:
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lea (%rdx,%rcx,8),%rdx
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jmp .L_fixup_handle_tail
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.L_fixup_4b_copy:
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lea (%rdx,%rcx,4),%rdx
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jmp .L_fixup_handle_tail
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.L_fixup_1b_copy:
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movl %ecx,%edx
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.L_fixup_handle_tail:
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sfence
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jmp .Lcopy_user_handle_tail
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.previous
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_ASM_EXTABLE_UA(1b, .L_fixup_4x8b_copy)
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_ASM_EXTABLE_UA(2b, .L_fixup_4x8b_copy)
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_ASM_EXTABLE_UA(3b, .L_fixup_4x8b_copy)
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_ASM_EXTABLE_UA(4b, .L_fixup_4x8b_copy)
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_ASM_EXTABLE_UA(5b, .L_fixup_4x8b_copy)
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_ASM_EXTABLE_UA(6b, .L_fixup_4x8b_copy)
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_ASM_EXTABLE_UA(7b, .L_fixup_4x8b_copy)
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_ASM_EXTABLE_UA(8b, .L_fixup_4x8b_copy)
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_ASM_EXTABLE_UA(9b, .L_fixup_4x8b_copy)
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_ASM_EXTABLE_UA(10b, .L_fixup_4x8b_copy)
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_ASM_EXTABLE_UA(11b, .L_fixup_4x8b_copy)
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_ASM_EXTABLE_UA(12b, .L_fixup_4x8b_copy)
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_ASM_EXTABLE_UA(13b, .L_fixup_4x8b_copy)
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_ASM_EXTABLE_UA(14b, .L_fixup_4x8b_copy)
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_ASM_EXTABLE_UA(15b, .L_fixup_4x8b_copy)
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_ASM_EXTABLE_UA(16b, .L_fixup_4x8b_copy)
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_ASM_EXTABLE_UA(20b, .L_fixup_8b_copy)
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_ASM_EXTABLE_UA(21b, .L_fixup_8b_copy)
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_ASM_EXTABLE_UA(30b, .L_fixup_4b_copy)
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_ASM_EXTABLE_UA(31b, .L_fixup_4b_copy)
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_ASM_EXTABLE_UA(40b, .L_fixup_1b_copy)
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_ASM_EXTABLE_UA(41b, .L_fixup_1b_copy)
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SYM_FUNC_END(__copy_user_nocache)
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EXPORT_SYMBOL(__copy_user_nocache)
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