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authorCatalin Marinas <catalin.marinas@arm.com>2005-06-24 21:27:39 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-06-24 21:27:39 +0100
commit79042f087b5ac7bba819de03dc3e7462bab8aad9 (patch)
tree0fb7ca4b0d690d59a4a0d5bc6774a345edb43284 /arch
parent5932ae3f5d610fd8d047ef4693bab9f084e5c56d (diff)
[PATCH] ARM: 2698/1: Enable kernel r/w access to user pages on ARMv6
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mm/proc-v6.S6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm/mm/proc-v6.S b/arch/arm/mm/proc-v6.S
index 0aa73d41478..e3d8510f434 100644
--- a/arch/arm/mm/proc-v6.S
+++ b/arch/arm/mm/proc-v6.S
@@ -132,8 +132,8 @@ ENTRY(cpu_v6_switch_mm)
* 100x 1 0 1 r/o no acc
* 10x0 1 0 1 r/o no acc
* 1011 0 0 1 r/w no acc
- * 110x 1 1 0 r/o r/o
- * 11x0 1 1 0 r/o r/o
+ * 110x 0 1 0 r/w r/o
+ * 11x0 0 1 0 r/w r/o
* 1111 0 1 1 r/w r/w
*/
ENTRY(cpu_v6_set_pte)
@@ -150,7 +150,7 @@ ENTRY(cpu_v6_set_pte)
tst r1, #L_PTE_USER
orrne r2, r2, #AP1 | nG
tstne r2, #APX
- eorne r2, r2, #AP0
+ bicne r2, r2, #APX | AP0
tst r1, #L_PTE_YOUNG
biceq r2, r2, #APX | AP1 | AP0