[Bug gas/28955] New: [mips] gas segfault when assembling a simple binary

[ochi12 at hotmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28955

            Bug ID: 28955
           Summary: [mips] gas segfault when assembling a simple binary
           Product: binutils
           Version: 2.38
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: ochi12 at hotmail dot com
  Target Milestone: ---

# Environment:

I'm using Ubuntu 20.04.1 on amd64. I've built the last release of binutils
using the toolchain available on Canonical's repos.

# Description:

GAS segfaults when trying to assemble the following file:

```
.global __start

.section .text

__start:
        jal 0x8011557c
```

the corresponding command and its output looks like this:
```
$ mips-linux-gnu-as -EB -mips32r2 -O1 -mabi=32 -march=mips32r2 -mfpxx
-mno-shared -KPIC -o /tmp/ccPzROEz.o main.s
main.s: Assembler messages:
main.s:6: Warning: no .cprestore pseudo-op used in PIC code
main.s: Internal error (Segmentation fault).
Please report this bug.
```

The reason I'm passing all those arguments is because that's the way that `gcc`
invokes `as` in order to compile it if one just executes `mips-linux-gnu-gcc
main.s`. This means that this crash occurs even when one invokes `gcc`, and not
`as` directly.

I've first noticed this bug on binutils 2.34, which is the version available on
Canonical's repos. Then I've compiled the latest release like so:

```
export PREFIX="$HOME/opt/cross"
export TARGET=mips-linux-gnu
export PATH="$PREFIX/bin:$PATH"
../binutils-2.38/configure --target=$TARGET --prefix="$PREFIX" --with-sysroot
--disable-nls --disable-werror
make
make install
```

tested it again and got the same results.

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