linux/arch/arm/mm/tlb-fa.S
Ard Biesheuvel 6b0ef2792c ARM: 9384/2: mm: Make tlbflush routines CFI safe
Instead of avoiding CFI entirely on the TLB flush helpers, reorganize
the code so that the CFI machinery can deal with it. The important
things to take into account are:
- functions in asm called indirectly from C need to be defined using
  SYM_TYPED_FUNC_START()
- a reference to the asm function needs to be visible to the compiler,
  in order to get it to emit the typeid symbol.

The latter means that defining the cpu_tlb_fns structs is best done from
C code, so that the references in the static initializers will be
visible to the compiler.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
2024-04-29 14:14:15 +01:00

66 lines
1.7 KiB
ArmAsm

/* SPDX-License-Identifier: GPL-2.0-only */
/*
* linux/arch/arm/mm/tlb-fa.S
*
* Copyright (C) 2005 Faraday Corp.
* Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
*
* Based on tlb-v4wbi.S:
* Copyright (C) 1997-2002 Russell King
*
* ARM architecture version 4, Faraday variation.
* This assume an unified TLBs, with a write buffer, and branch target buffer (BTB)
*
* Processors: FA520 FA526 FA626
*/
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/cfi_types.h>
#include <asm/assembler.h>
#include <asm/asm-offsets.h>
#include <asm/tlbflush.h>
#include "proc-macros.S"
/*
* flush_user_tlb_range(start, end, mm)
*
* Invalidate a range of TLB entries in the specified address space.
*
* - start - range start address
* - end - range end address
* - mm - mm_struct describing address space
*/
.align 4
SYM_TYPED_FUNC_START(fa_flush_user_tlb_range)
vma_vm_mm ip, r2
act_mm r3 @ get current->active_mm
eors r3, ip, r3 @ == mm ?
retne lr @ no, we dont do anything
mov r3, #0
mcr p15, 0, r3, c7, c10, 4 @ drain WB
bic r0, r0, #0x0ff
bic r0, r0, #0xf00
1: mcr p15, 0, r0, c8, c7, 1 @ invalidate UTLB entry
add r0, r0, #PAGE_SZ
cmp r0, r1
blo 1b
mcr p15, 0, r3, c7, c10, 4 @ data write barrier
ret lr
SYM_FUNC_END(fa_flush_user_tlb_range)
SYM_TYPED_FUNC_START(fa_flush_kern_tlb_range)
mov r3, #0
mcr p15, 0, r3, c7, c10, 4 @ drain WB
bic r0, r0, #0x0ff
bic r0, r0, #0xf00
1: mcr p15, 0, r0, c8, c7, 1 @ invalidate UTLB entry
add r0, r0, #PAGE_SZ
cmp r0, r1
blo 1b
mcr p15, 0, r3, c7, c10, 4 @ data write barrier
mcr p15, 0, r3, c7, c5, 4 @ prefetch flush (isb)
ret lr
SYM_FUNC_END(fa_flush_kern_tlb_range)