[ARM] nommu: abort handler fixup for !CPU_CP15_MMU cores.
There is no FSR/FAR register on no-CP15 or MPU cores. This patch adds a
dummy abort handler which returns zero for the base restored Data Abort
model !CPU_CP15_MMU cores. The abort-lv4t.S is still used with the fix-up
for the base updated Data Abort model cores.
Signed-off-by: Hyok S. Choi <hyok.choi@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index ae427de..6c1bd42 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -97,7 +97,7 @@
bool "Support ARM9TDMI processor"
depends on !MMU
select CPU_32v4T
- select CPU_ABRT_EV4T
+ select CPU_ABRT_NOMMU
select CPU_CACHE_V4
help
A 32-bit RISC microprocessor based on the ARM9 processor core
@@ -192,7 +192,7 @@
bool "Support ARM940T processor" if ARCH_INTEGRATOR
depends on !MMU
select CPU_32v4T
- select CPU_ABRT_EV4T
+ select CPU_ABRT_NOMMU
select CPU_CACHE_VIVT
select CPU_CP15_MPU
help
@@ -209,7 +209,7 @@
bool "Support ARM946E-S processor" if ARCH_INTEGRATOR
depends on !MMU
select CPU_32v5
- select CPU_ABRT_EV5T
+ select CPU_ABRT_NOMMU
select CPU_CACHE_VIVT
select CPU_CP15_MPU
help
@@ -392,6 +392,9 @@
bool
# The abort model
+config CPU_ABRT_NOMMU
+ bool
+
config CPU_ABRT_EV4
bool
diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile
index ed81b9e..d2f5672 100644
--- a/arch/arm/mm/Makefile
+++ b/arch/arm/mm/Makefile
@@ -17,6 +17,7 @@
obj-$(CONFIG_ALIGNMENT_TRAP) += alignment.o
obj-$(CONFIG_DISCONTIGMEM) += discontig.o
+obj-$(CONFIG_CPU_ABRT_NOMMU) += abort-nommu.o
obj-$(CONFIG_CPU_ABRT_EV4) += abort-ev4.o
obj-$(CONFIG_CPU_ABRT_EV4T) += abort-ev4t.o
obj-$(CONFIG_CPU_ABRT_LV4T) += abort-lv4t.o
diff --git a/arch/arm/mm/abort-lv4t.S b/arch/arm/mm/abort-lv4t.S
index db743e5..9fb7b0e 100644
--- a/arch/arm/mm/abort-lv4t.S
+++ b/arch/arm/mm/abort-lv4t.S
@@ -19,11 +19,16 @@
*/
ENTRY(v4t_late_abort)
tst r3, #PSR_T_BIT @ check for thumb mode
+#ifdef CONFIG_CPU_CP15_MMU
mrc p15, 0, r1, c5, c0, 0 @ get FSR
mrc p15, 0, r0, c6, c0, 0 @ get FAR
+ bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR
+#else
+ mov r0, #0 @ clear r0, r1 (no FSR/FAR)
+ mov r1, #0
+#endif
bne .data_thumb_abort
ldr r8, [r2] @ read arm instruction
- bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR
tst r8, #1 << 20 @ L = 1 -> write?
orreq r1, r1, #1 << 11 @ yes.
and r7, r8, #15 << 24
diff --git a/arch/arm/mm/abort-nommu.S b/arch/arm/mm/abort-nommu.S
new file mode 100644
index 0000000..a7cc7f9e
--- /dev/null
+++ b/arch/arm/mm/abort-nommu.S
@@ -0,0 +1,19 @@
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+/*
+ * Function: nommu_early_abort
+ *
+ * Params : r2 = address of aborted instruction
+ * : r3 = saved SPSR
+ *
+ * Returns : r0 = 0 (abort address)
+ * : r1 = 0 (FSR)
+ *
+ * Note: There is no FSR/FAR on !CPU_CP15_MMU cores.
+ * Just fill zero into the registers.
+ */
+ .align 5
+ENTRY(nommu_early_abort)
+ mov r0, #0 @ clear r0, r1 (no FSR/FAR)
+ mov r1, #0
+ mov pc, lr
diff --git a/arch/arm/mm/proc-arm940.S b/arch/arm/mm/proc-arm940.S
index 14846ac..2397f4b6 100644
--- a/arch/arm/mm/proc-arm940.S
+++ b/arch/arm/mm/proc-arm940.S
@@ -320,7 +320,7 @@
*/
.type arm940_processor_functions, #object
ENTRY(arm940_processor_functions)
- .word v4t_early_abort
+ .word nommu_early_abort
.word cpu_arm940_proc_init
.word cpu_arm940_proc_fin
.word cpu_arm940_reset
diff --git a/arch/arm/mm/proc-arm946.S b/arch/arm/mm/proc-arm946.S
index 6dc7942..e186175 100644
--- a/arch/arm/mm/proc-arm946.S
+++ b/arch/arm/mm/proc-arm946.S
@@ -375,7 +375,7 @@
*/
.type arm946_processor_functions, #object
ENTRY(arm946_processor_functions)
- .word v5t_early_abort
+ .word nommu_early_abort
.word cpu_arm946_proc_init
.word cpu_arm946_proc_fin
.word cpu_arm946_reset
diff --git a/arch/arm/mm/proc-arm9tdmi.S b/arch/arm/mm/proc-arm9tdmi.S
index 95c90f13..918ebf6 100644
--- a/arch/arm/mm/proc-arm9tdmi.S
+++ b/arch/arm/mm/proc-arm9tdmi.S
@@ -63,7 +63,7 @@
*/
.type arm9tdmi_processor_functions, #object
ENTRY(arm9tdmi_processor_functions)
- .word v4t_early_abort
+ .word nommu_early_abort
.word cpu_arm9tdmi_proc_init
.word cpu_arm9tdmi_proc_fin
.word cpu_arm9tdmi_reset