mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 21:57:43 +00:00
a2faac3986
Similar to commita6c30873ee("ARM: 8989/1: use .fpu assembler directives instead of assembler arguments"). GCC and GNU binutils support setting the "sub arch" via -march=, -Wa,-march, target function attribute, and .arch assembler directive. Clang was missing support for -Wa,-march=, but this was implemented in clang-13. The behavior of both GCC and Clang is to prefer -Wa,-march= over -march= for assembler and assembler-with-cpp sources, but Clang will warn about the -march= being unused. clang: warning: argument unused during compilation: '-march=armv6k' [-Wunused-command-line-argument] Since most assembler is non-conditionally assembled with one sub arch (modulo arch/arm/delay-loop.S which conditionally is assembled as armv4 based on CONFIG_ARCH_RPC, and arch/arm/mach-at91/pm-suspend.S which is conditionally assembled as armv7-a based on CONFIG_CPU_V7), prefer the .arch assembler directive. Add a few more instances found in compile testing as found by Arnd and Nathan. Link:1d51c699b9Link: https://bugs.llvm.org/show_bug.cgi?id=48894 Link: https://github.com/ClangBuiltLinux/linux/issues/1195 Link: https://github.com/ClangBuiltLinux/linux/issues/1315 Suggested-by: Arnd Bergmann <arnd@arndb.de> Suggested-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Tested-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
94 lines
2.5 KiB
ArmAsm
94 lines
2.5 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* linux/arch/arm/mm/tlb-v7.S
|
|
*
|
|
* Copyright (C) 1997-2002 Russell King
|
|
* Modified for ARMv7 by Catalin Marinas
|
|
*
|
|
* ARM architecture version 6 TLB handling functions.
|
|
* These assume a split I/D TLB.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/page.h>
|
|
#include <asm/tlbflush.h>
|
|
#include "proc-macros.S"
|
|
|
|
.arch armv7-a
|
|
|
|
/*
|
|
* v7wbi_flush_user_tlb_range(start, end, vma)
|
|
*
|
|
* Invalidate a range of TLB entries in the specified address space.
|
|
*
|
|
* - start - start address (may not be aligned)
|
|
* - end - end address (exclusive, may not be aligned)
|
|
* - vma - vm_area_struct describing address range
|
|
*
|
|
* It is assumed that:
|
|
* - the "Invalidate single entry" instruction will invalidate
|
|
* both the I and the D TLBs on Harvard-style TLBs
|
|
*/
|
|
ENTRY(v7wbi_flush_user_tlb_range)
|
|
vma_vm_mm r3, r2 @ get vma->vm_mm
|
|
mmid r3, r3 @ get vm_mm->context.id
|
|
dsb ish
|
|
mov r0, r0, lsr #PAGE_SHIFT @ align address
|
|
mov r1, r1, lsr #PAGE_SHIFT
|
|
asid r3, r3 @ mask ASID
|
|
#ifdef CONFIG_ARM_ERRATA_720789
|
|
ALT_SMP(W(mov) r3, #0 )
|
|
ALT_UP(W(nop) )
|
|
#endif
|
|
orr r0, r3, r0, lsl #PAGE_SHIFT @ Create initial MVA
|
|
mov r1, r1, lsl #PAGE_SHIFT
|
|
1:
|
|
#ifdef CONFIG_ARM_ERRATA_720789
|
|
ALT_SMP(mcr p15, 0, r0, c8, c3, 3) @ TLB invalidate U MVA all ASID (shareable)
|
|
#else
|
|
ALT_SMP(mcr p15, 0, r0, c8, c3, 1) @ TLB invalidate U MVA (shareable)
|
|
#endif
|
|
ALT_UP(mcr p15, 0, r0, c8, c7, 1) @ TLB invalidate U MVA
|
|
|
|
add r0, r0, #PAGE_SZ
|
|
cmp r0, r1
|
|
blo 1b
|
|
dsb ish
|
|
ret lr
|
|
ENDPROC(v7wbi_flush_user_tlb_range)
|
|
|
|
/*
|
|
* v7wbi_flush_kern_tlb_range(start,end)
|
|
*
|
|
* Invalidate a range of kernel TLB entries
|
|
*
|
|
* - start - start address (may not be aligned)
|
|
* - end - end address (exclusive, may not be aligned)
|
|
*/
|
|
ENTRY(v7wbi_flush_kern_tlb_range)
|
|
dsb ish
|
|
mov r0, r0, lsr #PAGE_SHIFT @ align address
|
|
mov r1, r1, lsr #PAGE_SHIFT
|
|
mov r0, r0, lsl #PAGE_SHIFT
|
|
mov r1, r1, lsl #PAGE_SHIFT
|
|
1:
|
|
#ifdef CONFIG_ARM_ERRATA_720789
|
|
ALT_SMP(mcr p15, 0, r0, c8, c3, 3) @ TLB invalidate U MVA all ASID (shareable)
|
|
#else
|
|
ALT_SMP(mcr p15, 0, r0, c8, c3, 1) @ TLB invalidate U MVA (shareable)
|
|
#endif
|
|
ALT_UP(mcr p15, 0, r0, c8, c7, 1) @ TLB invalidate U MVA
|
|
add r0, r0, #PAGE_SZ
|
|
cmp r0, r1
|
|
blo 1b
|
|
dsb ish
|
|
isb
|
|
ret lr
|
|
ENDPROC(v7wbi_flush_kern_tlb_range)
|
|
|
|
__INIT
|
|
|
|
/* define struct cpu_tlb_fns (see <asm/tlbflush.h> and proc-macros.S) */
|
|
define_tlb_functions v7wbi, v7wbi_tlb_flags_up, flags_smp=v7wbi_tlb_flags_smp
|