[lld] r255349 - ELF: Allow -e <entry> with -shared
Ed Maste via llvm-commits
llvm-commits at lists.llvm.org
Fri Dec 11 09:46:46 PST 2015
Author: emaste
Date: Fri Dec 11 11:46:46 2015
New Revision: 255349
URL: http://llvm.org/viewvc/llvm-project?rev=255349&view=rev
Log:
ELF: Allow -e <entry> with -shared
It is reasonable to specify an entry point for shared objects - for
example, for the FreeBSD rtld ld-elf.so.1.
Unlike GNU ld we leave the entry address as 0 if -shared is specified
without -e.
Differential Revision: http://reviews.llvm.org/D15454
Modified:
lld/trunk/ELF/Driver.cpp
lld/trunk/test/ELF/entry.s
Modified: lld/trunk/ELF/Driver.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Driver.cpp?rev=255349&r1=255348&r2=255349&view=diff
==============================================================================
--- lld/trunk/ELF/Driver.cpp (original)
+++ lld/trunk/ELF/Driver.cpp Fri Dec 11 11:46:46 2015
@@ -248,11 +248,6 @@ template <class ELFT> void LinkerDriver:
if (Config->Entry.empty())
Config->Entry = (Config->EMachine == EM_MIPS) ? "__start" : "_start";
- // Set either EntryAddr (if S is a number) or EntrySym (otherwise).
- StringRef S = Config->Entry;
- if (S.getAsInteger(0, Config->EntryAddr))
- Config->EntrySym = Symtab.addUndefined(S);
-
// In the assembly for 32 bit x86 the _GLOBAL_OFFSET_TABLE_ symbol
// is magical and is used to produce a R_386_GOTPC relocation.
// The R_386_GOTPC relocation value doesn't actually depend on the
@@ -268,6 +263,13 @@ template <class ELFT> void LinkerDriver:
Symtab.addIgnoredSym("_GLOBAL_OFFSET_TABLE_");
}
+ if (!Config->Entry.empty()) {
+ // Set either EntryAddr (if S is a number) or EntrySym (otherwise).
+ StringRef S = Config->Entry;
+ if (S.getAsInteger(0, Config->EntryAddr))
+ Config->EntrySym = Symtab.addUndefined(S);
+ }
+
// Define _gp for MIPS. st_value of _gp symbol will be updated by Writer
// so that it points to an absolute address which is relative to GOT.
// See "Global Data Symbols" in Chapter 6 in the following document:
Modified: lld/trunk/test/ELF/entry.s
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/entry.s?rev=255349&r1=255348&r2=255349&view=diff
==============================================================================
--- lld/trunk/test/ELF/entry.s (original)
+++ lld/trunk/test/ELF/entry.s Fri Dec 11 11:46:46 2015
@@ -2,6 +2,8 @@
# RUN: not ld.lld %t1 -o %t2
# RUN: ld.lld %t1 -o %t2 -e entry
# RUN: llvm-readobj -file-headers %t2 | FileCheck -check-prefix=SYM %s
+# RUN: ld.lld %t1 -shared -o %t2 -e entry
+# RUN: llvm-readobj -file-headers %t2 | FileCheck -check-prefix=DSO %s
# RUN: ld.lld %t1 -o %t2 -e 4096
# RUN: llvm-readobj -file-headers %t2 | FileCheck -check-prefix=DEC %s
# RUN: ld.lld %t1 -o %t2 -e 0xcafe
@@ -10,6 +12,7 @@
# RUN: llvm-readobj -file-headers %t2 | FileCheck -check-prefix=OCT %s
# SYM: Entry: 0x11000
+# DSO: Entry: 0x1000
# DEC: Entry: 0x1000
# HEX: Entry: 0xCAFE
# OCT: Entry: 0x1FF
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