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[PATCH] ARM: 2698/1: Enable kernel r/w access to user pages on ARMv6

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Patch from Catalin Marinas

cpu_v6_set_pte() sets the kernel access rights to r/o for user
pages (L_PTE_USER) when neither L_PTE_WRITE nor L_PTE_DIRTY are
set. This causes a kernel data abort when writing the TLS value
in the 0xffff0000 page. This patch enables the kernel r/w access.

Signed-off-by: Catalin Marinas
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Catalin Marinas 2005-06-24 21:27:39 +01:00 committed by Russell King
parent 5932ae3f5d
commit 79042f087b
1 changed files with 3 additions and 3 deletions
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6
arch/arm/mm/proc-v6.S
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@ -132,8 +132,8 @@ ENTRY(cpu_v6_switch_mm)
* 100x 1 0 1 r/o no acc * 100x 1 0 1 r/o no acc
* 10x0 1 0 1 r/o no acc * 10x0 1 0 1 r/o no acc
* 1011 0 0 1 r/w no acc * 1011 0 0 1 r/w no acc
* 110x 1 1 0 r/o r/o * 110x 0 1 0 r/w r/o
* 11x0 1 1 0 r/o r/o * 11x0 0 1 0 r/w r/o
* 1111 0 1 1 r/w r/w * 1111 0 1 1 r/w r/w
*/ */
ENTRY(cpu_v6_set_pte) ENTRY(cpu_v6_set_pte)
@ -150,7 +150,7 @@ ENTRY(cpu_v6_set_pte)
tst r1, #L_PTE_USER tst r1, #L_PTE_USER
orrne r2, r2, #AP1 | nG orrne r2, r2, #AP1 | nG
tstne r2, #APX tstne r2, #APX
eorne r2, r2, #AP0 bicne r2, r2, #APX | AP0
tst r1, #L_PTE_YOUNG tst r1, #L_PTE_YOUNG
biceq r2, r2, #APX | AP1 | AP0 biceq r2, r2, #APX | AP1 | AP0