https://sourceware.org/bugzilla/show_bug.cgi?id=16320
Bug ID: 16320
Summary: Gold generates odd MemSiz for TLS segment
Product: binutils
Version: 2.25 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gold
Assignee: ian at airs dot com
Reporter: hjl.tools at gmail dot com
CC: ccoutant at google dot com
[hjl@gnu-6 relro-6]$ cat x.cc
// This code is put into a shared library linked with -z relro.
// i1 and i2 are not relro variables.
int i1 = 1;
static int i2 = 2;
// P1 is a global relro variable.
int* const p1 __attribute__ ((aligned(32))) = &i1;
// P2 is a local relro variable.
int* const p2 __attribute__ ((aligned(32))) = &i2;
// Add a TLS variable to make sure -z relro works correctly with TLS.
__thread int i3 = 1;
__thread char i4[40] = { 1 };
[hjl@gnu-6 relro-6]$ make
./ld.gold -shared -z relro -o libx.so x.o
./strip --strip-debug libx.so -o bar
readelf -lSW bar > new.txt
readelf -lSW libx.so > old.txt
diff -up old.txt new.txt
--- old.txt 2013-12-11 12:38:48.674968042 -0800
+++ new.txt 2013-12-11 12:38:48.670968003 -0800
@@ -1,4 +1,4 @@
-There are 14 section headers, starting at offset 0x11d0:
+There are 14 section headers, starting at offset 0x10c8:
Section Headers:
[Nr] Name Type Address Off Size ES Flg
Lk Inf Al
@@ -13,9 +13,9 @@ Section Headers:
[ 8] .bss NOBITS 0000000000002004 001004 000000 00 WA
0 0 1
[ 9] .comment PROGBITS 0000000000000000 001004 00002d 01 MS
0 0 1
[10] .note.gnu.gold-version NOTE 0000000000000000 001034 00001c
00 0 0 4
- [11] .symtab SYMTAB 0000000000000000 001050 0000d8 18
12 3 8
- [12] .strtab STRTAB 0000000000000000 001128 000030 00
0 0 1
- [13] .shstrtab STRTAB 0000000000000000 001158 000072 00
0 0 1
+ [11] .shstrtab STRTAB 0000000000000000 001050 000072 00
0 0 1
+ [12] .symtab SYMTAB 0000000000000000 001448 0001b0 18
13 12 8
+ [13] .strtab STRTAB 0000000000000000 0015f8 00002b 00
0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings), l (large)
I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown)
@@ -32,7 +32,7 @@ Program Headers:
LOAD 0x000f20 0x0000000000001f20 0x0000000000001f20 0x0000e4
0x0000e4 RW 0x1000
DYNAMIC 0x000f50 0x0000000000001f50 0x0000000000001f50 0x0000b0
0x0000b0 RW 0x8
GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000
0x000000 RW 0
- TLS 0x000f20 0x0000000000001f20 0x0000000000001f20 0x00002c
0x000030 R 0x10
+ TLS 0x000f20 0x0000000000001f20 0x0000000000001f20 0x00002c
0x00002c R 0x10
GNU_RELRO 0x000f20 0x0000000000001f20 0x0000000000001f20 0x0000e0
0x0000e0 RW 0x10
Section to Segment mapping:
make: *** [all] Error 1
[hjl@gnu-6 relro-6]$
Gold generates
[ 5] .tdata PROGBITS 0000000000001f20 000f20 00002c 00 WAT
0 0 16
TLS 0x000f20 0x0000000000001f20 0x0000000000001f20 0x00002c 0x000030
R 0x10
Why is MemSiz > FileSiz?
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