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[ELF] - Linkerscript: implemented ADDR command.

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ADDR(section)
Return the absolute address (the VMA) of the named section.

Used in the wild, eg.: https://searchcode.com/file/53617342/arch/x86/kernel/vmlinux.lds.S

Differential revision: https://reviews.llvm.org/D23913

llvm-svn: 280070
This commit is contained in:
George Rimar 2016-08-30 09:54:01 +00:00
parent a2496cbed4
commit 96659df09c
3 changed files with 64 additions and 0 deletions
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31
lld/ELF/LinkerScript.cpp
View File

@ -532,6 +532,16 @@ template <class ELFT> bool LinkerScript<ELFT>::hasPhdrsCommands() {
return !Opt.PhdrsCommands.empty();
}
template <class ELFT>
typename ELFT::uint
LinkerScript<ELFT>::getOutputSectionAddress(StringRef Name) {
for (OutputSectionBase<ELFT> *Sec : *OutputSections)
if (Sec->getName() == Name)
return Sec->getVA();
error("undefined section " + Name);
return 0;
}
template <class ELFT>
typename ELFT::uint LinkerScript<ELFT>::getOutputSectionSize(StringRef Name) {
for (OutputSectionBase<ELFT> *Sec : *OutputSections)
@ -1044,6 +1054,21 @@ static uint64_t getSectionSize(StringRef Name) {
}
}
static uint64_t getSectionAddress(StringRef Name) {
switch (Config->EKind) {
case ELF32LEKind:
return Script<ELF32LE>::X->getOutputSectionAddress(Name);
case ELF32BEKind:
return Script<ELF32BE>::X->getOutputSectionAddress(Name);
case ELF64LEKind:
return Script<ELF64LE>::X->getOutputSectionAddress(Name);
case ELF64BEKind:
return Script<ELF64BE>::X->getOutputSectionAddress(Name);
default:
llvm_unreachable("unsupported target");
}
}
static uint64_t getHeaderSize() {
switch (Config->EKind) {
case ELF32LEKind:
@ -1154,6 +1179,12 @@ Expr ScriptParser::readPrimary() {
// Built-in functions are parsed here.
// https://sourceware.org/binutils/docs/ld/Builtin-Functions.html.
if (Tok == "ADDR") {
expect("(");
StringRef Name = next();
expect(")");
return [=](uint64_t Dot) { return getSectionAddress(Name); };
}
if (Tok == "ASSERT")
return readAssert();
if (Tok == "ALIGN") {

1
lld/ELF/LinkerScript.h
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@ -151,6 +151,7 @@ public:
void assignAddresses();
int compareSections(StringRef A, StringRef B);
bool hasPhdrsCommands();
uintX_t getOutputSectionAddress(StringRef Name);
uintX_t getOutputSectionSize(StringRef Name);
uintX_t getHeaderSize();

32
lld/test/ELF/linkerscript/linkerscript-addr.s Normal file
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@ -0,0 +1,32 @@
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
# RUN: echo "SECTIONS { \
# RUN: . = 0x1000; \
# RUN: .text : { *(.text*) } \
# RUN: .foo.1 : { *(.foo.1) } \
# RUN: .foo.2 ADDR(.foo.1) + 0x100 : { *(.foo.2) } \
# RUN: .foo.3 : { *(.foo.3) } \
# RUN: }" > %t.script
# RUN: ld.lld %t --script %t.script -o %t1
# RUN: llvm-objdump -section-headers %t1 | FileCheck %s
# CHECK: Sections:
# CHECK-NEXT: Idx Name Size Address Type
# CHECK-NEXT: 0 00000000 0000000000000000
# CHECK-NEXT: 1 .text 00000000 0000000000001000 TEXT DATA
# CHECK-NEXT: 2 .foo.1 00000008 0000000000001000 DATA
# CHECK-NEXT: 3 .foo.2 00000008 0000000000001100 DATA
# CHECK-NEXT: 4 .foo.3 00000008 0000000000001108 DATA
.text
.globl _start
_start:
.section .foo.1,"a"
.quad 1
.section .foo.2,"a"
.quad 2
.section .foo.3,"a"
.quad 3