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.
Showing the changes to scripts/decodecode (1 of 1 file). Show all
Unified · Split
| @@ -59,6 +59,14 @@ disas() { · 58 unmodified lines | ||
| 59 | 59 | ${CROSS_COMPILE}strip $1.o |
| 60 | 60 | fi |
| 61 | 61 | |
| 62 | + if [ "$ARCH" = "arm64" ]; then | |
| 63 | + if [ $width -eq 4 ]; then | |
| 64 | + type=inst | |
| 65 | + fi | |
| 66 | + | |
| 67 | + ${CROSS_COMPILE}strip $1.o | |
| 68 | + fi | |
| 69 | + | |
| 62 | 70 | ${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $1.o | \ |
| 63 | 71 | grep -v "/tmp\|Disassembly\|\.text\|^$" > $1.dis 2>&1 |
| 64 | 72 | } |