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[Bug gas/12186] New: "add ebx, OFFSET FLAT:_GLOBAL_OFFSET_TABLE_" is inc


From: hjl.tools at gmail dot com
Subject: [Bug gas/12186] New: "add ebx, OFFSET FLAT:_GLOBAL_OFFSET_TABLE_" is incorrectly assembled
Date: Wed, 3 Nov 2010 14:02:51 +0000

http://sourceware.org/bugzilla/show_bug.cgi?id=12186

           Summary: "add ebx, OFFSET FLAT:_GLOBAL_OFFSET_TABLE_" is
                    incorrectly assembled
           Product: binutils
           Version: 2.21 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
        AssignedTo: address@hidden
        ReportedBy: address@hidden


address@hidden pr46275]$ cat p.c
#include <stdio.h>
int main()
{ puts("Hello, world!"); return 0; }
address@hidden pr46275]$ make
gcc -m32 -masm=intel -fPIC -S p.c
gcc -m32 -o p p.s
./p

address@hidden pr46275]$ 

For some reason, the addend in R_386_GOTPC reloc is missing when compiled with
-masm=intel. The objdump difference between -masm=att [hello.o] that works and
-masm=intel [hello_.o] that fails is:

@@ -1,5 +1,5 @@

-hello.o:     file format elf32-i386
+hello_.o:     file format elf32-i386


 Disassembly of section .text:
@@ -12,7 +12,7 @@
    7:    83 ec 1c                 sub    $0x1c,%esp
    a:    e8 fc ff ff ff           call   b <main+0xb>
             b: R_386_PC32    __i686.get_pc_thunk.bx
-   f:    81 c3 02 00 00 00        add    $0x2,%ebx
+   f:    81 c3 00 00 00 00        add    $0x0,%ebx
             11: R_386_GOTPC    _GLOBAL_OFFSET_TABLE_
   15:    8d 83 00 00 00 00        lea    0x0(%ebx),%eax
             17: R_386_GOTOFF    .rodata

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