* [Qemu-devel] [PATCH] target-i386: Fix signedness of MSR_IA32_APICBASE_BASE
@ 2015-05-29 19:52 Eduardo Habkost
2015-06-02 14:20 ` Igor Mammedov
0 siblings, 1 reply; 2+ messages in thread
From: Eduardo Habkost @ 2015-05-29 19:52 UTC (permalink / raw)
To: qemu-devel
Cc: Peter Maydell, zhugh.fnst, Igor Mammedov, Paolo Bonzini,
Andreas Färber, Richard Henderson
Existing definition triggers the following when using clang
-fsanitize=undefined:
hw/intc/apic_common.c:314:55: runtime error: left shift of 1048575 by 12
places cannot be represented in type 'int'
Fix it so we won't try to shift a 1 to the sign bit of a signed integer.
Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
target-i386/cpu.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 4ee12ca..26182bd 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -305,7 +305,7 @@
#define MSR_IA32_APICBASE 0x1b
#define MSR_IA32_APICBASE_BSP (1<<8)
#define MSR_IA32_APICBASE_ENABLE (1<<11)
-#define MSR_IA32_APICBASE_BASE (0xfffff<<12)
+#define MSR_IA32_APICBASE_BASE (0xfffffU<<12)
#define MSR_IA32_FEATURE_CONTROL 0x0000003a
#define MSR_TSC_ADJUST 0x0000003b
#define MSR_IA32_TSCDEADLINE 0x6e0
--
2.1.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [Qemu-devel] [PATCH] target-i386: Fix signedness of MSR_IA32_APICBASE_BASE
2015-05-29 19:52 [Qemu-devel] [PATCH] target-i386: Fix signedness of MSR_IA32_APICBASE_BASE Eduardo Habkost
@ 2015-06-02 14:20 ` Igor Mammedov
0 siblings, 0 replies; 2+ messages in thread
From: Igor Mammedov @ 2015-06-02 14:20 UTC (permalink / raw)
To: Eduardo Habkost
Cc: Peter Maydell, zhugh.fnst, qemu-devel, Paolo Bonzini,
Andreas Färber, Richard Henderson
On Fri, 29 May 2015 16:52:34 -0300
Eduardo Habkost <ehabkost@redhat.com> wrote:
> Existing definition triggers the following when using clang
> -fsanitize=undefined:
>
> hw/intc/apic_common.c:314:55: runtime error: left shift of 1048575 by 12
> places cannot be represented in type 'int'
>
> Fix it so we won't try to shift a 1 to the sign bit of a signed integer.
>
> Suggested-by: Peter Maydell <peter.maydell@linaro.org>
> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
> ---
> target-i386/cpu.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/target-i386/cpu.h b/target-i386/cpu.h
> index 4ee12ca..26182bd 100644
> --- a/target-i386/cpu.h
> +++ b/target-i386/cpu.h
> @@ -305,7 +305,7 @@
> #define MSR_IA32_APICBASE 0x1b
> #define MSR_IA32_APICBASE_BSP (1<<8)
> #define MSR_IA32_APICBASE_ENABLE (1<<11)
> -#define MSR_IA32_APICBASE_BASE (0xfffff<<12)
> +#define MSR_IA32_APICBASE_BASE (0xfffffU<<12)
> #define MSR_IA32_FEATURE_CONTROL 0x0000003a
> #define MSR_TSC_ADJUST 0x0000003b
> #define MSR_IA32_TSCDEADLINE 0x6e0
^ permalink raw reply [flat|nested] 2+ messages in thread
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2015-05-29 19:52 [Qemu-devel] [PATCH] target-i386: Fix signedness of MSR_IA32_APICBASE_BASE Eduardo Habkost
2015-06-02 14:20 ` Igor Mammedov
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