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authorLaura Abbott <lauraa@codeaurora.org>2014-11-21 21:50:38 +0000
committerKees Cook <keescook@google.com>2015-10-07 13:11:53 -0700
commite025cf3e255ff6aa000c148e3f31e6f285d361b6 (patch)
tree7035f7e3be0ed8cb780127f3802a3d4ac39ecbe6
parent5be60a9db38af201efcedd4a29c47bc5b714c235 (diff)
downloadlinux-linaro-stable-e025cf3e255ff6aa000c148e3f31e6f285d361b6.tar.gz
UPSTREAM: arm64: Treat handle_arch_irq as a function pointer
handle_arch_irq isn't actually text, it's just a function pointer. It doesn't need to be stored in the text section and doing so causes problesm if we ever want to make the kernel text read only. Declare handle_arch_irq as a proper function pointer stored in the data section. Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Kees Cook <keescook@chromium.org> Signed-off-by: Laura Abbott <lauraa@codeaurora.org> Signed-off-by: Will Deacon <will.deacon@arm.com> (cherry picked from commit fcff588633e848aa728a4437ef96d437299ba03d) Signed-off-by: Tomasz Figa <tfiga@chromium.org> Bug: 24475017 Change-Id: I7c842503cd70881fa78bbeb47d98f15bb83f6446 Signed-off-by: Kees Cook <keescook@google.com>
-rw-r--r--arch/arm64/include/asm/irq.h1
-rw-r--r--arch/arm64/kernel/entry.S6
-rw-r--r--arch/arm64/kernel/irq.c2
3 files changed, 4 insertions, 5 deletions
diff --git a/arch/arm64/include/asm/irq.h b/arch/arm64/include/asm/irq.h
index e1f7ecdde11f..1eebf5bb0b58 100644
--- a/arch/arm64/include/asm/irq.h
+++ b/arch/arm64/include/asm/irq.h
@@ -3,7 +3,6 @@
#include <asm-generic/irq.h>
-extern void (*handle_arch_irq)(struct pt_regs *);
extern void migrate_irqs(void);
extern void set_handle_irq(void (*handle_irq)(struct pt_regs *));
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 44731de3afbe..c4cf36b10678 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -168,7 +168,8 @@ tsk .req x28 // current thread_info
* Interrupt handling.
*/
.macro irq_handler
- ldr x1, handle_arch_irq
+ adrp x1, handle_arch_irq
+ ldr x1, [x1, #:lo12:handle_arch_irq]
mov x0, sp
blr x1
.endm
@@ -708,6 +709,3 @@ ENTRY(sys_rt_sigreturn_wrapper)
mov x0, sp
b sys_rt_sigreturn
ENDPROC(sys_rt_sigreturn_wrapper)
-
-ENTRY(handle_arch_irq)
- .quad 0
diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c
index 071a6ec13bd8..240b75c0e94f 100644
--- a/arch/arm64/kernel/irq.c
+++ b/arch/arm64/kernel/irq.c
@@ -40,6 +40,8 @@ int arch_show_interrupts(struct seq_file *p, int prec)
return 0;
}
+void (*handle_arch_irq)(struct pt_regs *) = NULL;
+
void __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
{
if (handle_arch_irq)