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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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6d685e5318
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. Now, ENTRY/ENDPROC can be forced to be undefined on X86, so do so. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Borislav Petkov <bp@suse.de> 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: Bill Metzenthen <billm@melbpc.org.au> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Darren Hart <dvhart@infradead.org> Cc: "David S. Miller" <davem@davemloft.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: 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: Pavel Machek <pavel@ucw.cz> Cc: platform-driver-x86@vger.kernel.org Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20191011115108.12392-28-jslaby@suse.cz
180 lines
2.6 KiB
ArmAsm
180 lines
2.6 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* atomic64_t for 586+
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*
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* Copyright © 2010 Luca Barbieri
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*/
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#include <linux/linkage.h>
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#include <asm/alternative-asm.h>
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.macro read64 reg
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movl %ebx, %eax
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movl %ecx, %edx
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/* we need LOCK_PREFIX since otherwise cmpxchg8b always does the write */
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LOCK_PREFIX
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cmpxchg8b (\reg)
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.endm
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SYM_FUNC_START(atomic64_read_cx8)
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read64 %ecx
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ret
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SYM_FUNC_END(atomic64_read_cx8)
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SYM_FUNC_START(atomic64_set_cx8)
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1:
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/* we don't need LOCK_PREFIX since aligned 64-bit writes
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* are atomic on 586 and newer */
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cmpxchg8b (%esi)
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jne 1b
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ret
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SYM_FUNC_END(atomic64_set_cx8)
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SYM_FUNC_START(atomic64_xchg_cx8)
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1:
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LOCK_PREFIX
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cmpxchg8b (%esi)
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jne 1b
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ret
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SYM_FUNC_END(atomic64_xchg_cx8)
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.macro addsub_return func ins insc
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SYM_FUNC_START(atomic64_\func\()_return_cx8)
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pushl %ebp
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pushl %ebx
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pushl %esi
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pushl %edi
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movl %eax, %esi
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movl %edx, %edi
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movl %ecx, %ebp
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read64 %ecx
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1:
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movl %eax, %ebx
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movl %edx, %ecx
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\ins\()l %esi, %ebx
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\insc\()l %edi, %ecx
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LOCK_PREFIX
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cmpxchg8b (%ebp)
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jne 1b
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10:
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movl %ebx, %eax
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movl %ecx, %edx
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popl %edi
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popl %esi
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popl %ebx
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popl %ebp
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ret
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SYM_FUNC_END(atomic64_\func\()_return_cx8)
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.endm
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addsub_return add add adc
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addsub_return sub sub sbb
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.macro incdec_return func ins insc
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SYM_FUNC_START(atomic64_\func\()_return_cx8)
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pushl %ebx
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read64 %esi
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1:
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movl %eax, %ebx
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movl %edx, %ecx
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\ins\()l $1, %ebx
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\insc\()l $0, %ecx
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LOCK_PREFIX
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cmpxchg8b (%esi)
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jne 1b
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10:
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movl %ebx, %eax
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movl %ecx, %edx
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popl %ebx
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ret
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SYM_FUNC_END(atomic64_\func\()_return_cx8)
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.endm
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incdec_return inc add adc
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incdec_return dec sub sbb
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SYM_FUNC_START(atomic64_dec_if_positive_cx8)
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pushl %ebx
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read64 %esi
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1:
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movl %eax, %ebx
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movl %edx, %ecx
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subl $1, %ebx
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sbb $0, %ecx
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js 2f
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LOCK_PREFIX
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cmpxchg8b (%esi)
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jne 1b
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2:
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movl %ebx, %eax
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movl %ecx, %edx
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popl %ebx
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ret
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SYM_FUNC_END(atomic64_dec_if_positive_cx8)
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SYM_FUNC_START(atomic64_add_unless_cx8)
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pushl %ebp
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pushl %ebx
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/* these just push these two parameters on the stack */
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pushl %edi
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pushl %ecx
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movl %eax, %ebp
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movl %edx, %edi
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read64 %esi
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1:
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cmpl %eax, 0(%esp)
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je 4f
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2:
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movl %eax, %ebx
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movl %edx, %ecx
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addl %ebp, %ebx
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adcl %edi, %ecx
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LOCK_PREFIX
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cmpxchg8b (%esi)
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jne 1b
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movl $1, %eax
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3:
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addl $8, %esp
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popl %ebx
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popl %ebp
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ret
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4:
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cmpl %edx, 4(%esp)
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jne 2b
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xorl %eax, %eax
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jmp 3b
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SYM_FUNC_END(atomic64_add_unless_cx8)
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SYM_FUNC_START(atomic64_inc_not_zero_cx8)
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pushl %ebx
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read64 %esi
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1:
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movl %eax, %ecx
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orl %edx, %ecx
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jz 3f
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movl %eax, %ebx
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xorl %ecx, %ecx
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addl $1, %ebx
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adcl %edx, %ecx
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LOCK_PREFIX
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cmpxchg8b (%esi)
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jne 1b
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movl $1, %eax
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3:
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popl %ebx
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ret
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SYM_FUNC_END(atomic64_inc_not_zero_cx8)
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