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1036b89580
Tag all references to assembly functions with SYM_TYPED_FUNC_START() and SYM_FUNC_END() so they also become CFI-safe. When we add SYM_TYPED_FUNC_START() to assembly calls, a function prototype signature will be emitted into the object file at (pc-4) at the call site, so that the KCFI runtime check can compare this to the expected call. Example: 8011ae38: a540670c .word 0xa540670c 8011ae3c <v7_flush_icache_all>: 8011ae3c: e3a00000 mov r0, #0 8011ae40: ee070f11 mcr 15, 0, r0, cr7, cr1, {0} 8011ae44: e12fff1e bx lr This means no "fallthrough" code can enter a SYM_TYPED_FUNC_START() call from above it: there will be a function prototype signature there, so those are consistently converted to a branch or ret lr depending on context. 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>
157 lines
3.5 KiB
ArmAsm
157 lines
3.5 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* linux/arch/arm/mm/cache-v4.S
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*
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* Copyright (C) 1997-2002 Russell king
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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/page.h>
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#include "proc-macros.S"
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/*
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* flush_icache_all()
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*
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* Unconditionally clean and invalidate the entire icache.
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*/
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SYM_TYPED_FUNC_START(v4_flush_icache_all)
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ret lr
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SYM_FUNC_END(v4_flush_icache_all)
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/*
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* flush_user_cache_all()
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*
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* Invalidate all cache entries in a particular address
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* space.
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*
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* - mm - mm_struct describing address space
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*/
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SYM_TYPED_FUNC_START(v4_flush_user_cache_all)
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b v4_flush_kern_cache_all
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SYM_FUNC_END(v4_flush_user_cache_all)
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/*
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* flush_kern_cache_all()
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*
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* Clean and invalidate the entire cache.
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*/
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SYM_TYPED_FUNC_START(v4_flush_kern_cache_all)
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#ifdef CONFIG_CPU_CP15
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mov r0, #0
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mcr p15, 0, r0, c7, c7, 0 @ flush ID cache
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ret lr
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#else
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ret lr
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#endif
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SYM_FUNC_END(v4_flush_kern_cache_all)
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/*
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* flush_user_cache_range(start, end, flags)
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*
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* Invalidate a range of cache entries in the specified
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* address space.
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*
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* - start - start address (may not be aligned)
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* - end - end address (exclusive, may not be aligned)
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* - flags - vma_area_struct flags describing address space
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*/
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SYM_TYPED_FUNC_START(v4_flush_user_cache_range)
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#ifdef CONFIG_CPU_CP15
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mov ip, #0
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mcr p15, 0, ip, c7, c7, 0 @ flush ID cache
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ret lr
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#else
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ret lr
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#endif
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SYM_FUNC_END(v4_flush_user_cache_range)
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/*
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* coherent_kern_range(start, end)
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*
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* Ensure coherency between the Icache and the Dcache in the
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* region described by start. If you have non-snooping
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* Harvard caches, you need to implement this function.
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*
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* - start - virtual start address
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* - end - virtual end address
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*/
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SYM_TYPED_FUNC_START(v4_coherent_kern_range)
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ret lr
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SYM_FUNC_END(v4_coherent_kern_range)
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/*
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* coherent_user_range(start, end)
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*
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* Ensure coherency between the Icache and the Dcache in the
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* region described by start. If you have non-snooping
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* Harvard caches, you need to implement this function.
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*
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* - start - virtual start address
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* - end - virtual end address
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*/
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SYM_TYPED_FUNC_START(v4_coherent_user_range)
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mov r0, #0
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ret lr
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SYM_FUNC_END(v4_coherent_user_range)
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/*
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* flush_kern_dcache_area(void *addr, size_t size)
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*
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* Ensure no D cache aliasing occurs, either with itself or
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* the I cache
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*
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* - addr - kernel address
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* - size - region size
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*/
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SYM_TYPED_FUNC_START(v4_flush_kern_dcache_area)
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b v4_dma_flush_range
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SYM_FUNC_END(v4_flush_kern_dcache_area)
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/*
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* dma_flush_range(start, end)
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*
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* Clean and invalidate the specified virtual address range.
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*
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* - start - virtual start address
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* - end - virtual end address
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*/
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SYM_TYPED_FUNC_START(v4_dma_flush_range)
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#ifdef CONFIG_CPU_CP15
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mov r0, #0
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mcr p15, 0, r0, c7, c7, 0 @ flush ID cache
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#endif
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ret lr
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SYM_FUNC_END(v4_dma_flush_range)
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/*
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* dma_unmap_area(start, size, dir)
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* - start - kernel virtual start address
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* - size - size of region
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* - dir - DMA direction
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*/
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SYM_TYPED_FUNC_START(v4_dma_unmap_area)
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teq r2, #DMA_TO_DEVICE
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bne v4_dma_flush_range
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ret lr
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SYM_FUNC_END(v4_dma_unmap_area)
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/*
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* dma_map_area(start, size, dir)
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* - start - kernel virtual start address
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* - size - size of region
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* - dir - DMA direction
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*/
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SYM_TYPED_FUNC_START(v4_dma_map_area)
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ret lr
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SYM_FUNC_END(v4_dma_map_area)
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.globl v4_flush_kern_cache_louis
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.equ v4_flush_kern_cache_louis, v4_flush_kern_cache_all
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__INITDATA
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@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
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define_cache_functions v4
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