mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-28 07:04:00 +08:00
ba33ea811e
Pull x86 asm updates from Ingo Molnar:
"This is another big update. Main changes are:
- lots of x86 system call (and other traps/exceptions) entry code
enhancements. In particular the complex parts of the 64-bit entry
code have been migrated to C code as well, and a number of dusty
corners have been refreshed. (Andy Lutomirski)
- vDSO special mapping robustification and general cleanups (Andy
Lutomirski)
- cpufeature refactoring, cleanups and speedups (Borislav Petkov)
- lots of other changes ..."
* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (64 commits)
x86/cpufeature: Enable new AVX-512 features
x86/entry/traps: Show unhandled signal for i386 in do_trap()
x86/entry: Call enter_from_user_mode() with IRQs off
x86/entry/32: Change INT80 to be an interrupt gate
x86/entry: Improve system call entry comments
x86/entry: Remove TIF_SINGLESTEP entry work
x86/entry/32: Add and check a stack canary for the SYSENTER stack
x86/entry/32: Simplify and fix up the SYSENTER stack #DB/NMI fixup
x86/entry: Only allocate space for tss_struct::SYSENTER_stack if needed
x86/entry: Vastly simplify SYSENTER TF (single-step) handling
x86/entry/traps: Clear DR6 early in do_debug() and improve the comment
x86/entry/traps: Clear TIF_BLOCKSTEP on all debug exceptions
x86/entry/32: Restore FLAGS on SYSEXIT
x86/entry/32: Filter NT and speed up AC filtering in SYSENTER
x86/entry/compat: In SYSENTER, sink AC clearing below the existing FLAGS test
selftests/x86: In syscall_nt, test NT|TF as well
x86/asm-offsets: Remove PARAVIRT_enabled
x86/entry/32: Introduce and use X86_BUG_ESPFIX instead of paravirt_enabled
uprobes: __create_xol_area() must nullify xol_mapping.fault
x86/cpufeature: Create a new synthetic cpu capability for machine check recovery
...
297 lines
6.0 KiB
ArmAsm
297 lines
6.0 KiB
ArmAsm
/* Copyright 2002 Andi Kleen */
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/cpufeatures.h>
|
|
#include <asm/alternative-asm.h>
|
|
|
|
/*
|
|
* We build a jump to memcpy_orig by default which gets NOPped out on
|
|
* the majority of x86 CPUs which set REP_GOOD. In addition, CPUs which
|
|
* have the enhanced REP MOVSB/STOSB feature (ERMS), change those NOPs
|
|
* to a jmp to memcpy_erms which does the REP; MOVSB mem copy.
|
|
*/
|
|
|
|
.weak memcpy
|
|
|
|
/*
|
|
* memcpy - Copy a memory block.
|
|
*
|
|
* Input:
|
|
* rdi destination
|
|
* rsi source
|
|
* rdx count
|
|
*
|
|
* Output:
|
|
* rax original destination
|
|
*/
|
|
ENTRY(__memcpy)
|
|
ENTRY(memcpy)
|
|
ALTERNATIVE_2 "jmp memcpy_orig", "", X86_FEATURE_REP_GOOD, \
|
|
"jmp memcpy_erms", X86_FEATURE_ERMS
|
|
|
|
movq %rdi, %rax
|
|
movq %rdx, %rcx
|
|
shrq $3, %rcx
|
|
andl $7, %edx
|
|
rep movsq
|
|
movl %edx, %ecx
|
|
rep movsb
|
|
ret
|
|
ENDPROC(memcpy)
|
|
ENDPROC(__memcpy)
|
|
|
|
/*
|
|
* memcpy_erms() - enhanced fast string memcpy. This is faster and
|
|
* simpler than memcpy. Use memcpy_erms when possible.
|
|
*/
|
|
ENTRY(memcpy_erms)
|
|
movq %rdi, %rax
|
|
movq %rdx, %rcx
|
|
rep movsb
|
|
ret
|
|
ENDPROC(memcpy_erms)
|
|
|
|
ENTRY(memcpy_orig)
|
|
movq %rdi, %rax
|
|
|
|
cmpq $0x20, %rdx
|
|
jb .Lhandle_tail
|
|
|
|
/*
|
|
* We check whether memory false dependence could occur,
|
|
* then jump to corresponding copy mode.
|
|
*/
|
|
cmp %dil, %sil
|
|
jl .Lcopy_backward
|
|
subq $0x20, %rdx
|
|
.Lcopy_forward_loop:
|
|
subq $0x20, %rdx
|
|
|
|
/*
|
|
* Move in blocks of 4x8 bytes:
|
|
*/
|
|
movq 0*8(%rsi), %r8
|
|
movq 1*8(%rsi), %r9
|
|
movq 2*8(%rsi), %r10
|
|
movq 3*8(%rsi), %r11
|
|
leaq 4*8(%rsi), %rsi
|
|
|
|
movq %r8, 0*8(%rdi)
|
|
movq %r9, 1*8(%rdi)
|
|
movq %r10, 2*8(%rdi)
|
|
movq %r11, 3*8(%rdi)
|
|
leaq 4*8(%rdi), %rdi
|
|
jae .Lcopy_forward_loop
|
|
addl $0x20, %edx
|
|
jmp .Lhandle_tail
|
|
|
|
.Lcopy_backward:
|
|
/*
|
|
* Calculate copy position to tail.
|
|
*/
|
|
addq %rdx, %rsi
|
|
addq %rdx, %rdi
|
|
subq $0x20, %rdx
|
|
/*
|
|
* At most 3 ALU operations in one cycle,
|
|
* so append NOPS in the same 16 bytes trunk.
|
|
*/
|
|
.p2align 4
|
|
.Lcopy_backward_loop:
|
|
subq $0x20, %rdx
|
|
movq -1*8(%rsi), %r8
|
|
movq -2*8(%rsi), %r9
|
|
movq -3*8(%rsi), %r10
|
|
movq -4*8(%rsi), %r11
|
|
leaq -4*8(%rsi), %rsi
|
|
movq %r8, -1*8(%rdi)
|
|
movq %r9, -2*8(%rdi)
|
|
movq %r10, -3*8(%rdi)
|
|
movq %r11, -4*8(%rdi)
|
|
leaq -4*8(%rdi), %rdi
|
|
jae .Lcopy_backward_loop
|
|
|
|
/*
|
|
* Calculate copy position to head.
|
|
*/
|
|
addl $0x20, %edx
|
|
subq %rdx, %rsi
|
|
subq %rdx, %rdi
|
|
.Lhandle_tail:
|
|
cmpl $16, %edx
|
|
jb .Lless_16bytes
|
|
|
|
/*
|
|
* Move data from 16 bytes to 31 bytes.
|
|
*/
|
|
movq 0*8(%rsi), %r8
|
|
movq 1*8(%rsi), %r9
|
|
movq -2*8(%rsi, %rdx), %r10
|
|
movq -1*8(%rsi, %rdx), %r11
|
|
movq %r8, 0*8(%rdi)
|
|
movq %r9, 1*8(%rdi)
|
|
movq %r10, -2*8(%rdi, %rdx)
|
|
movq %r11, -1*8(%rdi, %rdx)
|
|
retq
|
|
.p2align 4
|
|
.Lless_16bytes:
|
|
cmpl $8, %edx
|
|
jb .Lless_8bytes
|
|
/*
|
|
* Move data from 8 bytes to 15 bytes.
|
|
*/
|
|
movq 0*8(%rsi), %r8
|
|
movq -1*8(%rsi, %rdx), %r9
|
|
movq %r8, 0*8(%rdi)
|
|
movq %r9, -1*8(%rdi, %rdx)
|
|
retq
|
|
.p2align 4
|
|
.Lless_8bytes:
|
|
cmpl $4, %edx
|
|
jb .Lless_3bytes
|
|
|
|
/*
|
|
* Move data from 4 bytes to 7 bytes.
|
|
*/
|
|
movl (%rsi), %ecx
|
|
movl -4(%rsi, %rdx), %r8d
|
|
movl %ecx, (%rdi)
|
|
movl %r8d, -4(%rdi, %rdx)
|
|
retq
|
|
.p2align 4
|
|
.Lless_3bytes:
|
|
subl $1, %edx
|
|
jb .Lend
|
|
/*
|
|
* Move data from 1 bytes to 3 bytes.
|
|
*/
|
|
movzbl (%rsi), %ecx
|
|
jz .Lstore_1byte
|
|
movzbq 1(%rsi), %r8
|
|
movzbq (%rsi, %rdx), %r9
|
|
movb %r8b, 1(%rdi)
|
|
movb %r9b, (%rdi, %rdx)
|
|
.Lstore_1byte:
|
|
movb %cl, (%rdi)
|
|
|
|
.Lend:
|
|
retq
|
|
ENDPROC(memcpy_orig)
|
|
|
|
#ifndef CONFIG_UML
|
|
/*
|
|
* memcpy_mcsafe - memory copy with machine check exception handling
|
|
* Note that we only catch machine checks when reading the source addresses.
|
|
* Writes to target are posted and don't generate machine checks.
|
|
*/
|
|
ENTRY(memcpy_mcsafe)
|
|
cmpl $8, %edx
|
|
/* Less than 8 bytes? Go to byte copy loop */
|
|
jb .L_no_whole_words
|
|
|
|
/* Check for bad alignment of source */
|
|
testl $7, %esi
|
|
/* Already aligned */
|
|
jz .L_8byte_aligned
|
|
|
|
/* Copy one byte at a time until source is 8-byte aligned */
|
|
movl %esi, %ecx
|
|
andl $7, %ecx
|
|
subl $8, %ecx
|
|
negl %ecx
|
|
subl %ecx, %edx
|
|
.L_copy_leading_bytes:
|
|
movb (%rsi), %al
|
|
movb %al, (%rdi)
|
|
incq %rsi
|
|
incq %rdi
|
|
decl %ecx
|
|
jnz .L_copy_leading_bytes
|
|
|
|
.L_8byte_aligned:
|
|
/* Figure out how many whole cache lines (64-bytes) to copy */
|
|
movl %edx, %ecx
|
|
andl $63, %edx
|
|
shrl $6, %ecx
|
|
jz .L_no_whole_cache_lines
|
|
|
|
/* Loop copying whole cache lines */
|
|
.L_cache_w0: movq (%rsi), %r8
|
|
.L_cache_w1: movq 1*8(%rsi), %r9
|
|
.L_cache_w2: movq 2*8(%rsi), %r10
|
|
.L_cache_w3: movq 3*8(%rsi), %r11
|
|
movq %r8, (%rdi)
|
|
movq %r9, 1*8(%rdi)
|
|
movq %r10, 2*8(%rdi)
|
|
movq %r11, 3*8(%rdi)
|
|
.L_cache_w4: movq 4*8(%rsi), %r8
|
|
.L_cache_w5: movq 5*8(%rsi), %r9
|
|
.L_cache_w6: movq 6*8(%rsi), %r10
|
|
.L_cache_w7: movq 7*8(%rsi), %r11
|
|
movq %r8, 4*8(%rdi)
|
|
movq %r9, 5*8(%rdi)
|
|
movq %r10, 6*8(%rdi)
|
|
movq %r11, 7*8(%rdi)
|
|
leaq 64(%rsi), %rsi
|
|
leaq 64(%rdi), %rdi
|
|
decl %ecx
|
|
jnz .L_cache_w0
|
|
|
|
/* Are there any trailing 8-byte words? */
|
|
.L_no_whole_cache_lines:
|
|
movl %edx, %ecx
|
|
andl $7, %edx
|
|
shrl $3, %ecx
|
|
jz .L_no_whole_words
|
|
|
|
/* Copy trailing words */
|
|
.L_copy_trailing_words:
|
|
movq (%rsi), %r8
|
|
mov %r8, (%rdi)
|
|
leaq 8(%rsi), %rsi
|
|
leaq 8(%rdi), %rdi
|
|
decl %ecx
|
|
jnz .L_copy_trailing_words
|
|
|
|
/* Any trailing bytes? */
|
|
.L_no_whole_words:
|
|
andl %edx, %edx
|
|
jz .L_done_memcpy_trap
|
|
|
|
/* Copy trailing bytes */
|
|
movl %edx, %ecx
|
|
.L_copy_trailing_bytes:
|
|
movb (%rsi), %al
|
|
movb %al, (%rdi)
|
|
incq %rsi
|
|
incq %rdi
|
|
decl %ecx
|
|
jnz .L_copy_trailing_bytes
|
|
|
|
/* Copy successful. Return true */
|
|
.L_done_memcpy_trap:
|
|
xorq %rax, %rax
|
|
ret
|
|
ENDPROC(memcpy_mcsafe)
|
|
|
|
.section .fixup, "ax"
|
|
/* Return false for any failure */
|
|
.L_memcpy_mcsafe_fail:
|
|
mov $1, %rax
|
|
ret
|
|
|
|
.previous
|
|
|
|
_ASM_EXTABLE_FAULT(.L_copy_leading_bytes, .L_memcpy_mcsafe_fail)
|
|
_ASM_EXTABLE_FAULT(.L_cache_w0, .L_memcpy_mcsafe_fail)
|
|
_ASM_EXTABLE_FAULT(.L_cache_w1, .L_memcpy_mcsafe_fail)
|
|
_ASM_EXTABLE_FAULT(.L_cache_w3, .L_memcpy_mcsafe_fail)
|
|
_ASM_EXTABLE_FAULT(.L_cache_w3, .L_memcpy_mcsafe_fail)
|
|
_ASM_EXTABLE_FAULT(.L_cache_w4, .L_memcpy_mcsafe_fail)
|
|
_ASM_EXTABLE_FAULT(.L_cache_w5, .L_memcpy_mcsafe_fail)
|
|
_ASM_EXTABLE_FAULT(.L_cache_w6, .L_memcpy_mcsafe_fail)
|
|
_ASM_EXTABLE_FAULT(.L_cache_w7, .L_memcpy_mcsafe_fail)
|
|
_ASM_EXTABLE_FAULT(.L_copy_trailing_words, .L_memcpy_mcsafe_fail)
|
|
_ASM_EXTABLE_FAULT(.L_copy_trailing_bytes, .L_memcpy_mcsafe_fail)
|
|
#endif
|