llvm/test/tools/llvm-objdump/ELF/ARM/unknown-instr-resync.test

# RUN: yaml2obj %s | llvm-objdump --no-print-imm-hex -d --mcpu=cortex-a8 - | FileCheck %s

# Test that unrecognized instructions are skipped in a way that makes
# sense for the Arm instruction set encoding.
#
# The first three instructions in this file are marked by the mapping
# symbols as in Arm state, with the one in the middle unknown, and we
# expect the disassembler to skip 4 bytes because that's the width of
# any Arm instruction.
#
# At address 0xc there's a mapping symbol that says we're now in Thumb
# mode, and in that mode we include both a 16-bit and a 32-bit unknown
# Thumb instruction, which the disassembler will identify by the simple
# encoding criterion that tells you the instruction length without
# having to recognize it specifically.
#
# Finally we end with a single byte, to ensure nothing gets confused
# when the Thumb instruction stream doesn't contain enough data to
# even do that check.

# CHECK:       0: e3a00064      mov     r0, #100
# CHECK-NEXT:  4: ffffffff      <unknown>
# CHECK-NEXT:  8: e0810312      add     r0, r1, r2, lsl r3

# CHECK:       c: 2064          movs    r0, #100
# CHECK-NEXT:  e: b80e          <unknown>
# CHECK-NEXT: 10: 1840          adds    r0, r0, r1
# CHECK-NEXT: 12: f04f 0064     mov.w   r0, #100
# CHECK-NEXT: 16: ffee ddcc     <unknown>
# CHECK-NEXT: 1a: eb01 00c2     add.w   r0, r1, r2, lsl #3
# CHECK-NEXT: 1e: 9a            <unknown>

--- !ELF
FileHeader:
  Class:           ELFCLASS32
  Data:            ELFDATA2LSB
  Type:            ET_REL
  Machine:         EM_ARM
  Flags:           [ EF_ARM_EABI_VER5 ]
Sections:
  - Name:            .text
    Type:            SHT_PROGBITS
    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
    AddressAlign:    0x4
    Content:         6400a0e3ffffffff120381e064200eb840184ff06400eeffccdd01ebc2009a
Symbols:
  - Name:            '$a'
    Section:         .text
  - Name:            '$t'
    Section:         .text
    Value:           0x0c
...