https://sourceware.org/bugzilla/show_bug.cgi?id=23854
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |i386,x86-64
Status|WAITING |NEW
Version|2.30 |2.32 (HEAD)
Summary|-no-pie -export-dynamic |16-bit GOT access is
|corrupts binary |incorrectly optimized
--- Comment #10 from H.J. Lu <hjl.tools at gmail dot com> ---
[hjl@gnu-cfl-1 pr23854]$ cat x.c
extern void foo (void);
short
foo_p (void)
{
return 0x400 - (int) &foo;
}
[hjl@gnu-cfl-1 pr23854]$ cat foo.c
extern short foo_p (void);
__attribute__ ((visibility("hidden")))
void
foo (void)
{
}
void
_start (void)
{
foo_p ();
}
[hjl@gnu-cfl-1 pr23854]$ make
gcc -m32 -B./ -O2 -fPIE -c -o x.o x.c
gcc -m32 -B./ -O2 -fPIE -c -o foo.o foo.c
ld -melf_i386 -o x x.o foo.o
[hjl@gnu-cfl-1 pr23854]$ objdump -dw x.o
x.o: file format elf32-i386
Disassembly of section .text:
00000000 <foo_p>:
0: e8 fc ff ff ff call 1 <foo_p+0x1>
5: 81 c2 02 00 00 00 add $0x2,%edx
b: b8 00 04 00 00 mov $0x400,%eax
10: 66 2b 82 00 00 00 00 sub 0x0(%edx),%ax
17: c3 ret
Disassembly of section .text.__x86.get_pc_thunk.dx:
00000000 <__x86.get_pc_thunk.dx>:
0: 8b 14 24 mov (%esp),%edx
3: c3 ret
[hjl@gnu-cfl-1 pr23854]$ objdump -dw x
x: file format elf32-i386
Disassembly of section .text:
08049000 <foo_p>:
8049000: e8 13 00 00 00 call 8049018 <__x86.get_pc_thunk.dx>
8049005: 81 c2 fb 2f 00 00 add $0x2ffb,%edx
804900b: b8 00 04 00 00 mov $0x400,%eax
8049010: 66 81 e8 20 90 sub $0x9020,%ax
8049015: 04 08 add $0x8,%al
8049017: c3 ret
08049018 <__x86.get_pc_thunk.dx>:
8049018: 8b 14 24 mov (%esp),%edx
804901b: c3 ret
804901c: 66 90 xchg %ax,%ax
804901e: 66 90 xchg %ax,%ax
08049020 <foo>:
8049020: c3 ret
8049021: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
8049028: 8d b4 26 00 00 00 00 lea 0x0(%esi,%eiz,1),%esi
804902f: 90 nop
08049030 <_start>:
8049030: 53 push %ebx
8049031: e8 13 00 00 00 call 8049049 <__x86.get_pc_thunk.bx>
8049036: 81 c3 ca 2f 00 00 add $0x2fca,%ebx
804903c: 83 ec 08 sub $0x8,%esp
804903f: e8 bc ff ff ff call 8049000 <foo_p>
8049044: 83 c4 08 add $0x8,%esp
8049047: 5b pop %ebx
8049048: c3 ret
08049049 <__x86.get_pc_thunk.bx>:
8049049: 8b 1c 24 mov (%esp),%ebx
804904c: c3 ret
[hjl@gnu-cfl-1 pr23854]$
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
bug-binutils mailing list
bug-binutils@gnu.org
https://lists.gnu.org/mailman/listinfo/bug-binutils
