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[Bug ld/797] Alignment in empty section changes the output layout
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From: |
hjl at lucon dot org |
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Subject: |
[Bug ld/797] Alignment in empty section changes the output layout |
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Date: |
22 Mar 2005 17:28:49 -0000 |
------- Additional Comments From hjl at lucon dot org 2005-03-22 17:28 -------
Created an attachment (id=441)
--> (http://sources.redhat.com/bugzilla/attachment.cgi?id=441&action=view)
A testcase
address@hidden empty-4]$ make
as -o foo.o foo.s
./ld -shared -o normal.so -T normal.x foo.o
./ld -shared -o align.so -T align.x foo.o
readelf -lS normal.so
There are 11 section headers, starting at offset 0x1154:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf
Al [ 0] NULL 00000000 000000 000000 00 0 0
0 [ 1] .text PROGBITS 00000000 001000 000004 00 AX 0 0
4 [ 2] .dynsym DYNSYM 00000004 001004 000060 10 A 3 3
4 [ 3] .dynstr STRTAB 00000064 001064 00000a 00 A 0 0
1 [ 4] .hash HASH 00000070 001070 00002c 04 A 2 0
4 [ 5] .data PROGBITS 0000009c 00109c 000004 00 WA 0 0
4 [ 6] .dynamic DYNAMIC 000000a0 0010a0 000058 08 WA 3 0
4 [ 7] .got.plt PROGBITS 000000f8 0010f8 00000c 04 WA 0 0
4 [ 8] .shstrtab STRTAB 00000000 001104 00004f 00 0 0
1 [ 9] .symtab SYMTAB 00000000 00130c 0000d0 10 10 12
4 [10] .strtab STRTAB 00000000 0013dc 000020 00 0 0
1Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
Elf file type is DYN (Shared object file)
Entry point 0x0
There are 2 program headers, starting at offset 52
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
LOAD 0x001000 0x00000000 0x00000000 0x00104 0x00104 RWE 0x1000
DYNAMIC 0x0010a0 0x000000a0 0x000000a0 0x00058 0x00058 RW 0x4
Section to Segment mapping:
Segment Sections...
00 .text .dynsym .dynstr .hash .data .dynamic .got.plt
01 .dynamic
readelf -lS align.so
There are 12 section headers, starting at offset 0x20c0:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf
Al [ 0] NULL 00000000 000000 000000 00 0 0
0 [ 1] .text PROGBITS 00000000 001000 000004 00 AX 0 0
4 [ 2] .dynsym DYNSYM 00000004 001004 000060 10 A 3 3
4 [ 3] .dynstr STRTAB 00000064 001064 00000a 00 A 0 0
1 [ 4] .hash HASH 00000070 001070 00002c 04 A 2 0
4 [ 5] .text2 NOBITS 0000009c 00109c 000f64 00 WA 0 0
1 [ 6] .data PROGBITS 00001000 002000 000004 00 WA 0 0
4 [ 7] .dynamic DYNAMIC 00001004 002004 000058 08 WA 3 0
4 [ 8] .got.plt PROGBITS 0000105c 00205c 00000c 04 WA 0 0
4 [ 9] .shstrtab STRTAB 00000000 002068 000056 00 0 0
1 [10] .symtab SYMTAB 00000000 0022a0 0000e0 10 11 13
4 [11] .strtab STRTAB 00000000 002380 000020 00 0 0
1Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
Elf file type is DYN (Shared object file)
Entry point 0x0
There are 3 program headers, starting at offset 52
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
LOAD 0x001000 0x00000000 0x00000000 0x0009c 0x01000 RWE 0x1000
LOAD 0x002000 0x00001000 0x00001000 0x00068 0x00068 RW 0x1000
DYNAMIC 0x002004 0x00001004 0x00001004 0x00058 0x00058 RW 0x4
Section to Segment mapping:
Segment Sections...
00 .text .dynsym .dynstr .hash .text2
01 .data .dynamic .got.plt
02 .dynamic
Shouldn't linker totally remove .text2 and .text3 sections as if they aren't
in the linker script?
--
http://sources.redhat.com/bugzilla/show_bug.cgi?id=797
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