File: x86-64-reloc-gotoff64.s

package info (click to toggle)
swiftlang 6.1.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 2,791,604 kB
  • sloc: cpp: 9,901,740; ansic: 2,201,431; asm: 1,091,827; python: 308,252; objc: 82,166; f90: 80,126; lisp: 38,358; pascal: 25,559; sh: 20,429; ml: 5,058; perl: 4,745; makefile: 4,484; awk: 3,535; javascript: 3,018; xml: 918; fortran: 664; cs: 573; ruby: 396
file content (26 lines) | stat: -rw-r--r-- 920 bytes parent folder | download | duplicates (17) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
 
// REQUIRES: x86
// RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
// RUN: ld.lld %t.o -shared -o %t.so
// RUN: llvm-readelf -S %t.so | FileCheck %s -check-prefix=SECTION
// RUN: llvm-objdump --no-print-imm-hex -d %t.so | FileCheck %s

// SECTION: .dynamic DYNAMIC 0000000000002290
// SECTION: .got.plt PROGBITS 0000000000003300 000300 000018

// The assembly is generated by
// gcc -O2 -S -mcmodel=medium -fPIC a.c
// This computes the pc-relative address (runtime address) of _DYNAMIC.
//
// extern long _DYNAMIC[] __attribute__((visibility("hidden")));
// long* dynamic() { return _DYNAMIC; }

// 0x3300 (.got.plt) - 0x127b = 8325
// 0x2290 (_DYNAMIC) - 0x3300 (.got.plt) = -4208
// CHECK:      1274: {{.*}} leaq 8325(%rip), %rdx
// CHECK-NEXT: 127b: {{.*}} movabsq $-4208, %rax
.global dynamic
dynamic:
  leaq _GLOBAL_OFFSET_TABLE_(%rip), %rdx
  movabsq $_DYNAMIC@GOTOFF, %rax
  addq %rdx, %rax
  ret