https://sourceware.org/bugzilla/show_bug.cgi?id=23658
Bug ID: 23658
Summary: Improve PT_NOTE segment creation
Product: binutils
Version: 2.32 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
[hjl@gnu-cfl-1 note]$ cat x.s
.text
.globl _start
.type _start, @function
_start:
ret
.section ".note.1", "a"
.p2align 3
.long 1f - 0f /* name length. */
.long 3f - 1f /* data length. */
.long 12345 /* note type. */
0:
.asciz "GNU" /* vendor name. */
1:
.p2align 3
.long 0 /* pr_type. */
.long 5f - 4f /* pr_datasz. */
4:
.zero 0x10
5:
.p2align 3
3:
[hjl@gnu-cfl-1 note]$ cat y.s
.section ".note.2", "a"
.p2align 2
.long 1f - 0f /* name length. */
.long 3f - 1f /* data length. */
.long 12345 /* note type. */
0:
.asciz "GNU" /* vendor name. */
1:
.p2align 2
.long 0 /* pr_type. */
.long 5f - 4f /* pr_datasz. */
4:
.zero 0x10
5:
.p2align 2
3:
[hjl@gnu-cfl-1 note]$ cat z.s
.section ".note.3", "a"
.p2align 2
.long 1f - 0f /* name length. */
.long 3f - 1f /* data length. */
.long 12345 /* note type. */
0:
.asciz "GNU" /* vendor name. */
1:
.p2align 2
.long 0 /* pr_type. */
.long 5f - 4f /* pr_datasz. */
4:
.zero 0x10
5:
.p2align 2
3:
[hjl@gnu-cfl-1 note]$ make
as -mx86-used-note=yes -o y.o y.s
as -mx86-used-note=yes -o x.o x.s
as -mx86-used-note=yes -o z.o z.s
./ld -z noseparate-code --build-id -o x y.o x.o z.o
readelf -lW x
Elf file type is EXEC (Executable file)
Entry point 0x400224
There are 5 program headers, starting at offset 64
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz
Flg Align
LOAD 0x000000 0x0000000000400000 0x0000000000400000 0x000225
0x000225 R E 0x1000
NOTE 0x000158 0x0000000000400158 0x0000000000400158 0x000028
0x000028 R 0x4
NOTE 0x000180 0x0000000000400180 0x0000000000400180 0x000030
0x000030 R 0x8
NOTE 0x0001b0 0x00000000004001b0 0x00000000004001b0 0x000028
0x000028 R 0x8
NOTE 0x0001d8 0x00000000004001d8 0x00000000004001d8 0x00004c
0x00004c R 0x4
Section to Segment mapping:
Segment Sections...
00 .note.2 .note.gnu.property .note.1 .note.3 .note.gnu.build-id .text
01 .note.2
02 .note.gnu.property
03 .note.1
04 .note.3 .note.gnu.build-id
[hjl@gnu-cfl-1 note]$
We can create just 2 PT_NOTE segments, instead of 4.
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