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[Qemu-devel] [PATCH] target-sparc: fix 32-bit truncation in fpackfix
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH] target-sparc: fix 32-bit truncation in fpackfix |
Date: |
Mon, 2 Nov 2015 15:05:34 +0100 |
This is reported by Coverity. The algorithm description at
ftp://ftp.icm.edu.pl/packages/ggi/doc/hw/sparc/Sparc.pdf suggests
that the 32-bit parts of rs2, after the left shift, is treated
as a 64-bit integer. Bits 32 and above are used to do the
saturating truncation.
Signed-off-by: Paolo Bonzini <address@hidden>
---
target-sparc/vis_helper.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/target-sparc/vis_helper.c b/target-sparc/vis_helper.c
index 383cc8b..45fc7db 100644
--- a/target-sparc/vis_helper.c
+++ b/target-sparc/vis_helper.c
@@ -447,7 +447,7 @@ uint32_t helper_fpackfix(uint64_t gsr, uint64_t rs2)
for (word = 0; word < 2; word++) {
uint32_t val;
int32_t src = rs2 >> (word * 32);
- int64_t scaled = src << scale;
+ int64_t scaled = (int64_t)src << scale;
int64_t from_fixed = scaled >> 16;
val = (from_fixed < -32768 ? -32768 :
--
2.5.0
- [Qemu-devel] [PATCH] target-sparc: fix 32-bit truncation in fpackfix,
Paolo Bonzini <=
- Re: [Qemu-devel] [PATCH] target-sparc: fix 32-bit truncation in fpackfix, Peter Maydell, 2015/11/02
- Re: [Qemu-devel] [PATCH] target-sparc: fix 32-bit truncation in fpackfix, Paolo Bonzini, 2015/11/02
- Re: [Qemu-devel] [PATCH] target-sparc: fix 32-bit truncation in fpackfix, Peter Maydell, 2015/11/02
- Re: [Qemu-devel] [PATCH] target-sparc: fix 32-bit truncation in fpackfix, Paolo Bonzini, 2015/11/02
- Re: [Qemu-devel] [PATCH] target-sparc: fix 32-bit truncation in fpackfix, Richard Henderson, 2015/11/04
- Re: [Qemu-devel] [PATCH] target-sparc: fix 32-bit truncation in fpackfix, Paolo Bonzini, 2015/11/04
- Re: [Qemu-devel] [PATCH] target-sparc: fix 32-bit truncation in fpackfix, Richard Henderson, 2015/11/04
- Re: [Qemu-devel] [PATCH] target-sparc: fix 32-bit truncation in fpackfix, Paolo Bonzini, 2015/11/04
- Re: [Qemu-devel] [PATCH] target-sparc: fix 32-bit truncation in fpackfix, Markus Armbruster, 2015/11/04
- Re: [Qemu-devel] [PATCH] target-sparc: fix 32-bit truncation in fpackfix, Paolo Bonzini, 2015/11/04