good code:
.intel_syntax
.globl main
main:
jmp DWORD PTR[ %edx + var_1 - 0x1000 ]
var_1:
.byte 0x11, 0x22, 0x33, 0x44
code generated: (objdump rip)
08048394 <main>:
8048394: ff a2 9a 73 04 08 jmp *0x804739a(%edx)
0804839a <var_1>:
...
the jmp correctly references var_1 - 0x1000 (0804839a -0x1000 = 0x804739a)
but modified code:
.intel_syntax
.globl main
var_1:
.byte 0x11, 0x22, 0x33, 0x44
main:
jmp DWORD PTR[ %edx + var_1 - 0x1000 ]
code generated: (objdump rip)
08048394 <var_1>:
8048394: 11 22
8048396: 33 44
08048398 <main>:
8048398: ff a2 94 83 04 08 jmp *0x8048394(%edx)
the jmp directly accesses var_1
it seems to forget to add -0x1000 to memory deref
$ as --version
GNU assembler (GNU Binutils for Debian) 2.20
--
Summary: invalid code generation depending on code position
Product: binutils
Version: 2.20
Status: NEW
Severity: normal
Priority: P2
Component: binutils
AssignedTo: unassigned at sources dot redhat dot com
ReportedBy: serpilliere at droids-corp dot org
CC: bug-binutils at gnu dot org
http://sourceware.org/bugzilla/show_bug.cgi?id=11037
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