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Date: Thu, 15 Apr 2021 05:43:23 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27733

            Bug ID: 27733
           Summary: use _start as program entry=EF=BC=8Cthe program print m=
ore
                    than expect on mips64el
           Product: glibc
           Version: 2.28
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: gzjsgdsb at 163 dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

1.write test.c=20

#include <stdio.h>
#include <stdlib.h>

int _start()
{
        printf("Hello, world! ");

        exit(0);
}

2.gcc -nostartfiles test.c

3. ./a.out  (there art two output)
Hello, world!
Hello, world!

=EF=BF=BD9


on mips64el,the bt is
Breakpoint 2, __GI___libc_write (fd=3D1, buf=3D0x120014260, nbytes=3D18) at
../sysdeps/unix/sysv/linux/write.c:26
26      ../sysdeps/unix/sysv/linux/write.c: =E6=B2=A1=E6=9C=89=E9=82=A3=E4=
=B8=AA=E6=96=87=E4=BB=B6=E6=88=96=E7=9B=AE=E5=BD=95.
(gdb) bt
#7  0x00007ffff7f235e8 in _IO_old_file_setbuf (fp=3D0x7ffff7f7e770 <_IO_std=
out_>,
p=3D<optimized out>, len=3D<optimized out>) at oldfileops.c:239
#8  0x00007ffff7d7e554 in _IO_unbuffer_all () at libioP.h:839
#9  _IO_cleanup () at genops.c:867
#10 0x00007ffff7ce084c in __run_exit_handlers (status=3D<optimized out>,
listp=3D0x7ffff7f7d588 <__exit_funcs>, run_list_atexit=3D<optimized out>,
run_dtors=3D<optimized out>) at exit.c:130
#11 0x00007ffff7ce09ac in __GI_exit (status=3D<optimized out>) at exit.c:139
#12 0x000000012000058c in __start () at test.c:9

but on x86 machion,the function _IO_old_file_setbuf is replaceed to
_IO_new_file_setbuf

--=20
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