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6b0ef2792c
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>
63 lines
1.5 KiB
ArmAsm
63 lines
1.5 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* linux/arch/arm/mm/tlbv4.S
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*
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* Copyright (C) 1997-2002 Russell King
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*
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* ARM architecture version 4 TLB handling functions.
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* These assume a split I/D TLBs, and no write buffer.
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*
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* Processors: ARM720T
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <linux/cfi_types.h>
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#include <asm/assembler.h>
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#include <asm/asm-offsets.h>
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#include <asm/tlbflush.h>
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#include "proc-macros.S"
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.align 5
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/*
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* v4_flush_user_tlb_range(start, end, mm)
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*
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* Invalidate a range of TLB entries in the specified user address space.
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*
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* - start - range start address
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* - end - range end address
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* - mm - mm_struct describing address space
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*/
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.align 5
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SYM_TYPED_FUNC_START(v4_flush_user_tlb_range)
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vma_vm_mm ip, r2
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act_mm r3 @ get current->active_mm
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eors r3, ip, r3 @ == mm ?
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retne lr @ no, we dont do anything
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.v4_flush_kern_tlb_range:
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bic r0, r0, #0x0ff
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bic r0, r0, #0xf00
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1: mcr p15, 0, r0, c8, c7, 1 @ invalidate TLB entry
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add r0, r0, #PAGE_SZ
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cmp r0, r1
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blo 1b
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ret lr
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SYM_FUNC_END(v4_flush_user_tlb_range)
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/*
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* v4_flush_kern_tlb_range(start, end)
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*
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* Invalidate a range of TLB entries in the specified kernel
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* address range.
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*
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* - start - virtual address (may not be aligned)
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* - end - virtual address (may not be aligned)
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*/
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#ifdef CONFIG_CFI_CLANG
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SYM_TYPED_FUNC_START(v4_flush_kern_tlb_range)
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b .v4_flush_kern_tlb_range
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SYM_FUNC_END(v4_flush_kern_tlb_range)
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#else
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.globl v4_flush_kern_tlb_range
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.equ v4_flush_kern_tlb_range, .v4_flush_kern_tlb_range
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#endif
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