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ARM: 5746/1: Handle possible translation errors in ARMv6/v7 coherent_user_range

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This is needed because applications using the sys_cacheflush system call
can pass a memory range which isn't mapped yet even though the
corresponding vma is valid. The patch also adds unwinding annotations
for correct backtraces from the coherent_user_range() functions.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Catalin Marinas 2009-10-06 17:57:09 +01:00 committed by Russell King
parent cc1ad4a696
commit 32cfb1b16f
2 changed files with 35 additions and 4 deletions
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20
arch/arm/mm/cache-v6.S
View File

@ -12,6 +12,7 @@
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/assembler.h>
#include <asm/unwind.h>
#include "proc-macros.S"
@ -121,11 +122,13 @@ ENTRY(v6_coherent_kern_range)
* - the Icache does not read data from the write buffer
*/
ENTRY(v6_coherent_user_range)
UNWIND(.fnstart )
#ifdef HARVARD_CACHE
bic r0, r0, #CACHE_LINE_SIZE - 1
1: mcr p15, 0, r0, c7, c10, 1 @ clean D line
1:
USER( mcr p15, 0, r0, c7, c10, 1 ) @ clean D line
add r0, r0, #CACHE_LINE_SIZE
2:
cmp r0, r1
blo 1b
#endif
@ -142,6 +145,19 @@ ENTRY(v6_coherent_user_range)
#endif
mov pc, lr
/*
* Fault handling for the cache operation above. If the virtual address in r0
* isn't mapped, just try the next page.
*/
9001:
mov r0, r0, lsr #12
mov r0, r0, lsl #12
add r0, r0, #4096
b 2b
UNWIND(.fnend )
ENDPROC(v6_coherent_user_range)
ENDPROC(v6_coherent_kern_range)
/*
* v6_flush_kern_dcache_page(kaddr)
*

19
arch/arm/mm/cache-v7.S
View File

@ -13,6 +13,7 @@
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/assembler.h>
#include <asm/unwind.h>
#include "proc-macros.S"
@ -153,13 +154,16 @@ ENTRY(v7_coherent_kern_range)
* - the Icache does not read data from the write buffer
*/
ENTRY(v7_coherent_user_range)
UNWIND(.fnstart )
dcache_line_size r2, r3
sub r3, r2, #1
bic r0, r0, r3
1: mcr p15, 0, r0, c7, c11, 1 @ clean D line to the point of unification
1:
USER( mcr p15, 0, r0, c7, c11, 1 ) @ clean D line to the point of unification
dsb
mcr p15, 0, r0, c7, c5, 1 @ invalidate I line
USER( mcr p15, 0, r0, c7, c5, 1 ) @ invalidate I line
add r0, r0, r2
2:
cmp r0, r1
blo 1b
mov r0, #0
@ -167,6 +171,17 @@ ENTRY(v7_coherent_user_range)
dsb
isb
mov pc, lr
/*
* Fault handling for the cache operation above. If the virtual address in r0
* isn't mapped, just try the next page.
*/
9001:
mov r0, r0, lsr #12
mov r0, r0, lsl #12
add r0, r0, #4096
b 2b
UNWIND(.fnend )
ENDPROC(v7_coherent_kern_range)
ENDPROC(v7_coherent_user_range)