Relocation
GAS
0000000000000000 <foo>:
0: 00 00 4c 3c addis r2,r12,0
4: 00 00 42 38 addi r2,r2,0
8: a1 ff 21 f8 stdu r1,-96(r1)
c: a6 02 08 7c mflr r0
10: 3d 00 e1 f7 stxv vs63,48(r1)
14: 2d 00 c1 f7 stxv vs62,32(r1)
18: 58 00 e1 db stfd f31,88(r1)
1c: 70 00 01 f8 std r0,112(r1)
20: 50 00 e1 fb std r31,80(r1)
24: 48 00 c1 fb std r30,72(r1)
28: 00 00 e0 3b li r31,0
2c: 8c 03 01 10 vspltisw v0,1
30: 78 1b 7e 7c mr r30,r3
34: d7 fc ff f3 xxlxor vs63,vs63,vs63
38: e3 03 c0 f3 xvcvsxwdp vs62,vs32
3c: 96 f4 fe f3 xxlor vs31,vs62,vs62
40: 96 fc 3f f0 xxlor vs1,vs63,vs63
44: 01 00 00 48 bl 44 <foo+0x44>
48: 00 00 00 60 nop
4c: 01 00 ff 3b addi r31,r31,1
50: 07 f1 ff f3 xsadddp vs63,vs63,vs62
54: 00 fc e1 f3 xsmaxcdp vs31,vs1,vs31
58: 00 f0 1f 7c cmpw r31,r30
5c: e4 ff 80 41 blt 40 <foo+0x40>
60: 90 fc 3f f0 xxlor vs1,vs31,vs31
64: 39 00 e1 f7 lxv vs63,48(r1)
68: 29 00 c1 f7 lxv vs62,32(r1)
6c: 70 00 01 e8 ld r0,112(r1)
70: 50 00 e1 eb ld r31,80(r1)
74: a6 03 08 7c mtlr r0
78: 48 00 c1 eb ld r30,72(r1)
7c: 58 00 e1 cb lfd f31,88(r1)
80: 60 00 21 38 addi r1,r1,96
84: 20 00 80 4e blr
88: 00 00 00 00 .long 0x0
8c: 00 00 22 01 .long 0x1220000
90: 81 02 00 00 .long 0x281
94: 88 00 00 00 .long 0x88
Line 44 is a relocation.
Bash
readelf xlc.o -a
ELF 头：
Magic： 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
类别: ELF64
数据: 2 补码，小端序 (little endian)
版本: 1 (current)
OS/ABI: UNIX - System V
ABI 版本: 0
类型: REL (可重定位文件)
系统架构: PowerPC64
版本: 0x1
入口点地址： 0x0
程序头起点： 0 (bytes into file)
Start of section headers: 64 (bytes into file)
标志： 0x2, abiv2
本头的大小： 64 (字节)
程序头大小： 0 (字节)
Number of program headers: 0
节头大小： 64 (字节)
节头数量： 9
字符串表索引节头： 1
节头：
[号] 名称 类型 地址 偏移量
大小 全体大小 旗标 链接 信息 对齐
[ 0] NULL 0000000000000000 00000000
0000000000000000 0000000000000000 0 0 0
[ 1] .shstrtab STRTAB 0000000000000000 00000640
00000000000000cf 0000000000000000 0 0 0
[ 2] .symtab SYMTAB 0000000000000000 00000870
0000000000000090 0000000000000018 3 3 0
[ 3] .strtab STRTAB 0000000000000000 00000900
0000000000000025 0000000000000000 0 0 0
[ 4] .text PROGBITS 0000000000000000 00000780
0000000000000098 0000000000000000 AX 0 0 32
[ 5] .rela.text RELA 0000000000000000 00000820
0000000000000048 0000000000000018 2 4 8
[ 6] .comment PROGBITS 0000000000000000 00000720
0000000000000043 0000000000000000 0 0 1
[ 7] .eh_frame PROGBITS 0000000000000000 00000930
0000000000000060 0000000000000000 WA 0 0 8
[ 8] .rela.eh_frame RELA 0000000000000000 00000990
0000000000000018 0000000000000018 2 7 8
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
L (link order), O (extra OS processing required), G (group), T (TLS),
C (compressed), x (unknown), o (OS specific), E (exclude),
p (processor specific)
There are no section groups in this file.
本文件中没有程序头。
重定位节 '.rela.text' 位于偏移量 0x820 含有 3 个条目：
偏移量 信息 类型 符号值 符号名称 + 加数
000000000000 0004000000fc R_PPC64_REL16_HA 0000000000000000 .TOC. + 0
000000000004 0004000000fa R_PPC64_REL16_LO 0000000000000000 .TOC. + 4
000000000044 00050000000a R_PPC64_REL24 0000000000000000 __xl_sin + 0
重定位节 '.rela.eh_frame' 位于偏移量 0x990 含有 1 个条目：
偏移量 信息 类型 符号值 符号名称 + 加数
000000000020 00020000002c R_PPC64_REL64 0000000000000000 .The_Code + 0
The decoding of unwind sections for machine type PowerPC64 is not currently supported.
Symbol table '.symtab' contains 6 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000000 0 FILE LOCAL DEFAULT ABS foo.c
2: 0000000000000000 152 SECTION LOCAL DEFAULT 4 .The_Code
3: 0000000000000000 152 FUNC GLOBAL DEFAULT [<localentry>: 8] 4 foo
4: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND .TOC.
5: 0000000000000000 0 FUNC GLOBAL DEFAULT UND __xl_sin
No version information found in this file.