[LLVMbugs] [Bug 7745] New: llvm-mc: ARMDisassemblerCore.cpp:890: bool DisassembleBrMiscFrm(llvm::MCInst&, unsigned int, uint32_t, short unsigned int, unsigned int&, llvm::ARMBasicMCBuilder*): Assertion `0 && "Unexpected BrMiscFrm Opcode"' failed.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7745

           Summary: llvm-mc: ARMDisassemblerCore.cpp:890: bool
                    DisassembleBrMiscFrm(llvm::MCInst&, unsigned int,
                    uint32_t, short unsigned int, unsigned int&,
                    llvm::ARMBasicMCBuilder*): Assertion `0 && "Unexpected
                    BrMiscFrm Opcode"' failed.
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sliedes at cc.hut.fi
                CC: llvmbugs at cs.uiuc.edu


(this is trunk revision 109745)

Hi,

I tested the ARM disassembler in MC with all possible 4-byte instructions, and
found three different assertion failures. This is the first one of them (1/3).
I'm running this on amd64 Debian linux.

------------------------------------------------------------
$ echo '0x00 0xf0 0xa0 0xe1' |Debug+Asserts/bin/llvm-mc --disassemble
--triple=arm
llvm-mc: ARMDisassemblerCore.cpp:890: bool DisassembleBrMiscFrm(llvm::MCInst&,
unsigned int, uint32_t, short unsigned int, unsigned int&,
llvm::ARMBasicMCBuilder*): Assertion `0 && "Unexpected BrMiscFrm Opcode"'
failed.
0  llvm-mc         0x0000000000d75854
1  llvm-mc         0x0000000000d75718
2  libpthread.so.0 0x00007f8419950f60
3  libc.so.6       0x00007f8418c63175 gsignal + 53
4  libc.so.6       0x00007f8418c65f80 abort + 384
5  libc.so.6       0x00007f8418c5c2b1 __assert_fail + 241
6  llvm-mc         0x000000000055cdc8
7  llvm-mc         0x000000000056bc05
8  llvm-mc         0x000000000056c8dd
9  llvm-mc         0x0000000000559cca
10 llvm-mc         0x0000000000407287
11 llvm-mc         0x0000000000407b02
12 llvm-mc         0x000000000040bc11
13 llvm-mc         0x000000000040bce9 main + 193
14 libc.so.6       0x00007f8418c4fc4d __libc_start_main + 253
15 llvm-mc         0x0000000000406fe9
Stack dump:
0.      Program arguments: Debug+Asserts/bin/llvm-mc --disassemble --triple=arm 
Aborted
------------------------------------------------------------

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