path: root/scripts/decodecode
diff options
authorWill Deacon <>2018-01-18 16:33:57 -0800
committerLinus Torvalds <>2018-01-19 10:09:41 -0800
commitbe9fa663d325a102de53c9ab6d00a31dcb36bb73 (patch)
tree132d53fb5b363a1e981255f35870bab06d08efcf /scripts/decodecode
parent6bec6ad77fac3d29aed0d8e0b7526daedc964970 (diff)
scripts/decodecode: fix decoding for AArch64 (arm64) instructions
There are a couple of problems with the decodecode script and arm64: 1. AArch64 objdump refuses to disassemble .4byte directives as instructions, insisting that they are data values and displaying them as: a94153f3 .word 0xa94153f3 <-- trapping instruction This is resolved by using the .inst directive instead. 2. Disassembly of branch instructions attempts to provide the target as an offset from a symbol, e.g.: 0: 34000082 cbz w2, 10 <.text+0x10> however this falls foul of the grep -v, which matches lines containing ".text" and ends up removing all branch instructions from the dump. This patch resolves both issues by using the .inst directive for 4-byte quantities on arm64 and stripping the resulting binaries (as is done on arm already) to remove the mapping symbols. Link: Signed-off-by: Will Deacon <> Reviewed-by: Dave Martin <> Cc: Michal Marek <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'scripts/decodecode')
1 files changed, 8 insertions, 0 deletions
diff --git a/scripts/decodecode b/scripts/decodecode
index 438120da1361..5ea071099330 100755
--- a/scripts/decodecode
+++ b/scripts/decodecode
@@ -59,6 +59,14 @@ disas() {
${CROSS_COMPILE}strip $1.o
+ if [ "$ARCH" = "arm64" ]; then
+ if [ $width -eq 4 ]; then
+ type=inst
+ fi
+ ${CROSS_COMPILE}strip $1.o
+ fi
grep -v "/tmp\|Disassembly\|\.text\|^$" > $1.dis 2>&1