https://sourceware.org/bugzilla/show_bug.cgi?id=20280
Bug ID: 20280
Summary: gold output is different from ld when LMA is set
Product: binutils
Version: 2.27 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: phosek at google dot com
CC: ian at airs dot com
Target Milestone: ---
I found a difference in behavior between gold and ld when LMA is set for a
section but not for subsequent sections. See the example below:
---
$ cat test.S
.section .text
nop
.section .data
.long 123
$ cat test.ld
SECTIONS
{
.text : AT(0x1000000) { *(.text) }
.data : { *(.data) }
}
$ as test.S -o test.o
$ ld.bfd test.o -T test.ld -o test-bfd
$ readelf -lW test-bfd
Elf file type is EXEC (Executable file)
Entry point 0x0
There are 1 program headers, starting at offset 64
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz
Flg Align
LOAD 0x200000 0x0000000000000000 0x0000000001000000 0x000005
0x000005 RWE 0x200000
Section to Segment mapping:
Segment Sections...
00 .text .data
$ ld.gold test.o -T test.ld -o test-gold
$ readelf -lW test-gold
Elf file type is EXEC (Executable file)
Entry point 0x0
There are 2 program headers, starting at offset 64
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz
Flg Align
LOAD 0x001020 0x0000000000000020 0x0000000000000020 0x000004
0x000004 RW 0x1000
LOAD 0x002000 0x0000000000000000 0x0000000001000000 0x000001
0x000001 R E 0x1000
Section to Segment mapping:
Segment Sections...
00 .data
01 .text
---
The important bit is the difference between the .data section physical address
in case of ld and gold. Seems like ld reuses the existing memory region (the
one used for .text section), for the .data section while gold believes that
there is no suitable region for the .data section and sets its LMA to the VMA.
--
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
