[Bug gas/32501] New: [GAS] Imprecise assembly syntax check in MIPS

[witbring at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=32501

            Bug ID: 32501
           Summary: [GAS] Imprecise assembly syntax check in MIPS
           Product: binutils
           Version: 2.41
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: witbring at gmail dot com
  Target Milestone: ---

I observed an issue in GAS related to inaccurate syntax checking and incorrect
encoding in MIPS.

Specifically, I found that syntactically incorrect assembly code was
successfully compiled. For instance, in the example below, parentheses in the
operand, which should indicate memory references, were misinterpreted in the
compiled output as the operand is an immediate value.

```
$ ./bin/mips-linux-gnu-as buggy.s -o buggy.o

$ cat buggy.s
    syscall (1)
    break (2)
    c2 (3)
    c3 (4)

$ objdump -d buggy.o

buggy.o:     file format elf32-tradbigmips

Disassembly of section .text:

00000000 <.text>:
   0:   0000004c        syscall 0x1
   4:   0002000d        break   0x2
   8:   4a000003        c2      0x3
   c:   4e000004        c3      0x4
```

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