3.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
commit e39e3f3ebfef03450cf7bfa7a974a8c61f7980c8 upstream.
FIQ should no longer copy the FIQ code into the user visible vector
page. Instead, it should use the hidden page. This change makes
that happen.
Acked-by: Nicolas Pitre <nico@xxxxxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/kernel/entry-armv.S | 3 +++
arch/arm/kernel/fiq.c | 19 ++++++++++++++-----
2 files changed, 17 insertions(+), 5 deletions(-)
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -1119,6 +1119,9 @@ vector_addrexcptn:
vector_fiq:
subs pc, lr, #4
+ .globl vector_fiq_offset
+ .equ vector_fiq_offset, vector_fiq
+
.section .vectors, "ax", %progbits
__vectors_start:
W(b) vector_rst
--- a/arch/arm/kernel/fiq.c
+++ b/arch/arm/kernel/fiq.c
@@ -47,6 +47,11 @@
#include <asm/irq.h>
#include <asm/traps.h>
+#define FIQ_OFFSET ({ \
+ extern void *vector_fiq_offset; \
+ (unsigned)&vector_fiq_offset; \
+ })
+
static unsigned long no_fiq_insn;
/* Default reacquire function
@@ -80,13 +85,16 @@ int show_fiq_list(struct seq_file *p, in
void set_fiq_handler(void *start, unsigned int length)
{
#if defined(CONFIG_CPU_USE_DOMAINS)
- memcpy((void *)0xffff001c, start, length);
+ void *base = (void *)0xffff0000;
#else
- memcpy(vectors_page + 0x1c, start, length);
+ void *base = vectors_page;
#endif
- flush_icache_range(0xffff001c, 0xffff001c + length);
+ unsigned offset = FIQ_OFFSET;
+
+ memcpy(base + offset, start, length);
+ flush_icache_range(0xffff0000 + offset, 0xffff0000 + offset + length);
if (!vectors_high())
- flush_icache_range(0x1c, 0x1c + length);
+ flush_icache_range(offset, offset + length);
}
int claim_fiq(struct fiq_handler *f)
@@ -144,6 +152,7 @@ EXPORT_SYMBOL(disable_fiq);
void __init init_FIQ(int start)
{
- no_fiq_insn = *(unsigned long *)0xffff001c;
+ unsigned offset = FIQ_OFFSET;
+ no_fiq_insn = *(unsigned long *)(0xffff0000 + offset);
fiq_start = start;
}
--
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