mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-03 00:36:42 +07:00
49db46a67b
Sequences:
pushl_cfi %reg
CFI_REL_OFFSET reg, 0
and:
popl_cfi %reg
CFI_RESTORE reg
happen quite often. This patch adds macros which generate them.
No assembly changes (verified with objdump -dr vmlinux.o).
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1421017655-25561-1-git-send-email-dvlasenk@redhat.com
Link: http://lkml.kernel.org/r/2202eb90f175cf45d1b2d1c64dbb5676a8ad07ad.1424989793.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
206 lines
3.1 KiB
ArmAsm
206 lines
3.1 KiB
ArmAsm
/*
|
|
* atomic64_t for 586+
|
|
*
|
|
* Copyright © 2010 Luca Barbieri
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/alternative-asm.h>
|
|
#include <asm/dwarf2.h>
|
|
|
|
.macro read64 reg
|
|
movl %ebx, %eax
|
|
movl %ecx, %edx
|
|
/* we need LOCK_PREFIX since otherwise cmpxchg8b always does the write */
|
|
LOCK_PREFIX
|
|
cmpxchg8b (\reg)
|
|
.endm
|
|
|
|
ENTRY(atomic64_read_cx8)
|
|
CFI_STARTPROC
|
|
|
|
read64 %ecx
|
|
ret
|
|
CFI_ENDPROC
|
|
ENDPROC(atomic64_read_cx8)
|
|
|
|
ENTRY(atomic64_set_cx8)
|
|
CFI_STARTPROC
|
|
|
|
1:
|
|
/* we don't need LOCK_PREFIX since aligned 64-bit writes
|
|
* are atomic on 586 and newer */
|
|
cmpxchg8b (%esi)
|
|
jne 1b
|
|
|
|
ret
|
|
CFI_ENDPROC
|
|
ENDPROC(atomic64_set_cx8)
|
|
|
|
ENTRY(atomic64_xchg_cx8)
|
|
CFI_STARTPROC
|
|
|
|
1:
|
|
LOCK_PREFIX
|
|
cmpxchg8b (%esi)
|
|
jne 1b
|
|
|
|
ret
|
|
CFI_ENDPROC
|
|
ENDPROC(atomic64_xchg_cx8)
|
|
|
|
.macro addsub_return func ins insc
|
|
ENTRY(atomic64_\func\()_return_cx8)
|
|
CFI_STARTPROC
|
|
pushl_cfi_reg ebp
|
|
pushl_cfi_reg ebx
|
|
pushl_cfi_reg esi
|
|
pushl_cfi_reg edi
|
|
|
|
movl %eax, %esi
|
|
movl %edx, %edi
|
|
movl %ecx, %ebp
|
|
|
|
read64 %ecx
|
|
1:
|
|
movl %eax, %ebx
|
|
movl %edx, %ecx
|
|
\ins\()l %esi, %ebx
|
|
\insc\()l %edi, %ecx
|
|
LOCK_PREFIX
|
|
cmpxchg8b (%ebp)
|
|
jne 1b
|
|
|
|
10:
|
|
movl %ebx, %eax
|
|
movl %ecx, %edx
|
|
popl_cfi_reg edi
|
|
popl_cfi_reg esi
|
|
popl_cfi_reg ebx
|
|
popl_cfi_reg ebp
|
|
ret
|
|
CFI_ENDPROC
|
|
ENDPROC(atomic64_\func\()_return_cx8)
|
|
.endm
|
|
|
|
addsub_return add add adc
|
|
addsub_return sub sub sbb
|
|
|
|
.macro incdec_return func ins insc
|
|
ENTRY(atomic64_\func\()_return_cx8)
|
|
CFI_STARTPROC
|
|
pushl_cfi_reg ebx
|
|
|
|
read64 %esi
|
|
1:
|
|
movl %eax, %ebx
|
|
movl %edx, %ecx
|
|
\ins\()l $1, %ebx
|
|
\insc\()l $0, %ecx
|
|
LOCK_PREFIX
|
|
cmpxchg8b (%esi)
|
|
jne 1b
|
|
|
|
10:
|
|
movl %ebx, %eax
|
|
movl %ecx, %edx
|
|
popl_cfi_reg ebx
|
|
ret
|
|
CFI_ENDPROC
|
|
ENDPROC(atomic64_\func\()_return_cx8)
|
|
.endm
|
|
|
|
incdec_return inc add adc
|
|
incdec_return dec sub sbb
|
|
|
|
ENTRY(atomic64_dec_if_positive_cx8)
|
|
CFI_STARTPROC
|
|
pushl_cfi_reg ebx
|
|
|
|
read64 %esi
|
|
1:
|
|
movl %eax, %ebx
|
|
movl %edx, %ecx
|
|
subl $1, %ebx
|
|
sbb $0, %ecx
|
|
js 2f
|
|
LOCK_PREFIX
|
|
cmpxchg8b (%esi)
|
|
jne 1b
|
|
|
|
2:
|
|
movl %ebx, %eax
|
|
movl %ecx, %edx
|
|
popl_cfi_reg ebx
|
|
ret
|
|
CFI_ENDPROC
|
|
ENDPROC(atomic64_dec_if_positive_cx8)
|
|
|
|
ENTRY(atomic64_add_unless_cx8)
|
|
CFI_STARTPROC
|
|
pushl_cfi_reg ebp
|
|
pushl_cfi_reg ebx
|
|
/* these just push these two parameters on the stack */
|
|
pushl_cfi_reg edi
|
|
pushl_cfi_reg ecx
|
|
|
|
movl %eax, %ebp
|
|
movl %edx, %edi
|
|
|
|
read64 %esi
|
|
1:
|
|
cmpl %eax, 0(%esp)
|
|
je 4f
|
|
2:
|
|
movl %eax, %ebx
|
|
movl %edx, %ecx
|
|
addl %ebp, %ebx
|
|
adcl %edi, %ecx
|
|
LOCK_PREFIX
|
|
cmpxchg8b (%esi)
|
|
jne 1b
|
|
|
|
movl $1, %eax
|
|
3:
|
|
addl $8, %esp
|
|
CFI_ADJUST_CFA_OFFSET -8
|
|
popl_cfi_reg ebx
|
|
popl_cfi_reg ebp
|
|
ret
|
|
4:
|
|
cmpl %edx, 4(%esp)
|
|
jne 2b
|
|
xorl %eax, %eax
|
|
jmp 3b
|
|
CFI_ENDPROC
|
|
ENDPROC(atomic64_add_unless_cx8)
|
|
|
|
ENTRY(atomic64_inc_not_zero_cx8)
|
|
CFI_STARTPROC
|
|
pushl_cfi_reg ebx
|
|
|
|
read64 %esi
|
|
1:
|
|
movl %eax, %ecx
|
|
orl %edx, %ecx
|
|
jz 3f
|
|
movl %eax, %ebx
|
|
xorl %ecx, %ecx
|
|
addl $1, %ebx
|
|
adcl %edx, %ecx
|
|
LOCK_PREFIX
|
|
cmpxchg8b (%esi)
|
|
jne 1b
|
|
|
|
movl $1, %eax
|
|
3:
|
|
popl_cfi_reg ebx
|
|
ret
|
|
CFI_ENDPROC
|
|
ENDPROC(atomic64_inc_not_zero_cx8)
|