[Bug libc/17601] New: __start function can not reach __libc_start_main in different region

["mips32r2 at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17601

            Bug ID: 17601
           Summary: __start function can not reach __libc_start_main in
                    different region
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: mips32r2 at gmail dot com
                CC: drepper.fsp at gmail dot com

Reproduction steps:

Try to compile the following example for mips32:

int main() {
  asm(".fill 100000000, 4, 0x00000000\n");
  return 0;
}

Current behaviour:

Compiling it will trigger the following error:

../sysdeps/mips/start.S:109:(.text+0x44): relocation truncated to fit:
R_MIPS_26 against `__libc_start_main@@GLIBC_2.0'
collect2: error: ld returned 1 exit status

Expected behaviour:

The program is linked without problems and can be executed.

Additional info:

This is a small and trivial example, but the real world application - and that
is Chromium browser_tests will fail to link due to the very same issue.
As reported by ld, the root cause is in the function __start which tends to
use:

jal     __libc_start_main

even though __libc_start_main may not be in the same 256MB-aligned region.
This function ends up as part of the initial runtime code in crt1.o.

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