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authorGiacomo Travaglini <giacomo.travaglini@arm.com>2017-12-15 10:03:19 +0000
committerGiacomo Travaglini <giacomo.travaglini@arm.com>2017-12-19 16:43:45 +0000
commit1e05c299820e1e795ba1bb090ec823db90833ec7 (patch)
treee5986dc18dc2413a1b42d981960f3f184d48bacd /src/arch/arm
parent50749b849647f132868d5022f7523530d6c711a3 (diff)
downloadgem5-1e05c299820e1e795ba1bb090ec823db90833ec7.tar.xz
arch-arm: Instruction size methods in StaticInst class
This patch is introducing some methods in StaticInst so that is possible to get the instruction size in byte of the instruction (can be 2 bytes in Thumb) and the correct opcode (The machInst field contains some appended metadata) Change-Id: I3bed4d9fd7c77feaeded40ded192afe445d306ea Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-on: https://gem5-review.googlesource.com/6781 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Diffstat (limited to 'src/arch/arm')
-rw-r--r--src/arch/arm/insts/static_inst.hh19
1 files changed, 19 insertions, 0 deletions
diff --git a/src/arch/arm/insts/static_inst.hh b/src/arch/arm/insts/static_inst.hh
index 431e81b07..4595646cb 100644
--- a/src/arch/arm/insts/static_inst.hh
+++ b/src/arch/arm/insts/static_inst.hh
@@ -423,6 +423,25 @@ class ArmStaticInst : public StaticInst
{
return intWidth;
}
+
+ /** Returns the byte size of current instruction */
+ ssize_t
+ instSize() const
+ {
+ return (!machInst.thumb || machInst.bigThumb) ? 4 : 2;
+ }
+
+ /**
+ * Returns the real encoding of the instruction:
+ * the machInst field is in fact always 64 bit wide and
+ * contains some instruction metadata, which means it differs
+ * from the real opcode.
+ */
+ MachInst
+ encoding() const
+ {
+ return static_cast<MachInst>(mask(instSize() * 8));
+ }
};
}