https://sourceware.org/bugzilla/show_bug.cgi?id=17592
Bug ID: 17592
Summary: x86-64 linker generates wrong PLT for large model
Product: binutils
Version: 2.26 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
When PLT is more 2GB from GOT, we must use large model PLT layout.
Otherwise, PLT entry can't load GOT entry:
[hjl@gnu-6 large-2]$ cat main.c
extern void foo (void);
extern void bar (void);
int
main ()
{
foo ();
bar ();
return 0;
}
[hjl@gnu-6 large-2]$ cat foo.c
#include <stdio.h>
void
foo (void)
{
printf ("hello\n");
}
[hjl@gnu-6 large-2]$ cat gap.S
.text
.p2align 4,,15
.globl bar
.type bar, @function
bar:
jmp .L0
.space 0x40000000, 0x90
.L0:
jmp .L2
.space 0x3fdffe14, 0x90
.L2:
leaq .L2(%rip), %rcx
movabsq $_GLOBAL_OFFSET_TABLE_-.L2, %r11
movabsq $foo@PLTOFF, %rax
addq %r11, %rcx
addq %rcx, %rax
jmp *%rax
.size bar, .-bar
.section .note.GNU-stack,"",@progbits
[hjl@gnu-6 large-2]$ make
gcc -O2 -c -o main.o main.c
gcc -O2 -c -o gap.o gap.S
gcc -O2 -mcmodel=large -fpic -c -o foo.o foo.c
./ld -shared -o libfoo.so gap.o foo.o
gcc -O2 -o foo main.o libfoo.so -Wl,-R,.
./foo
make: *** [all] Segmentation fault
[hjl@gnu-6 large-2]$
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