Support garbage collection against STT_GNU_IFUNC symbols.

bfd/

2010-07-13  H.J. Lu  <hongjiu.lu@intel.com>

	PR ld/11791
	* elf-ifunc.c (_bfd_elf_allocate_ifunc_dyn_relocs): Support
	garbage collection against STT_GNU_IFUNC symbols.

	* elf32-i386.c (elf_i386_get_local_sym_hash): Don't set
	elf.plt.offset/elf.got.offset to -1.
	(elf_i386_tls_transition): Skip TLS transition for functions.
	(elf_i386_gc_sweep_hook): Support STT_GNU_IFUNC symbols.

	* elf64-x86-64.c (elf64_x86_64_get_local_sym_hash): Don't set
	elf.plt.offset/elf.got.offset to -1.
	(elf64_x86_64_tls_transition): Skip TLS transition for functions.
	(elf64_x86_64_gc_sweep_hook): Support STT_GNU_IFUNC symbols.

ld/testsuite/

2010-07-13  H.J. Lu  <hongjiu.lu@intel.com>

	PR ld/11791
	* ld-ifunc/ifunc-10-i386.d: New.
	* ld-ifunc/ifunc-10-i386.s: Likewise.
	* ld-ifunc/ifunc-10-x86-64.d: Likewise.
	* ld-ifunc/ifunc-10-x86-64.s: Likewise.
	* ld-ifunc/ifunc-11-i386.d: Likewise.
	* ld-ifunc/ifunc-11-i386.s: Likewise.
	* ld-ifunc/ifunc-11-x86-64.d: Likewise.
	* ld-ifunc/ifunc-11-x86-64.s: Likewise.

8 files changed, 106 insertions, 0 deletions

diff --git a/ld/testsuite/ld-ifunc/ifunc-10-i386.d b/ld/testsuite/ld-ifunc/ifunc-10-i386.d
new file mode 100644
index 0000000..5f56b24
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-10-i386.d
@@ -0,0 +1,6 @@
+#ld: -m elf_i386 -e bar --gc-sections
+#as: --32
+#readelf: -r --wide
+#target: x86_64-*-* i?86-*-*
+
+There are no relocations in this file.
diff --git a/ld/testsuite/ld-ifunc/ifunc-10-i386.s b/ld/testsuite/ld-ifunc/ifunc-10-i386.s
new file mode 100644
index 0000000..8411e81
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-10-i386.s
@@ -0,0 +1,20 @@
+        .section .text.foo,"ax",@progbits
+        .type foo, @function
+foo:
+        .global foo
+        movl ifunc@GOT(%ecx), %eax
+        movl ifunc@GOTOFF(%ecx), %eax
+	call ifunc@PLT
+	call ifunc
+        ret
+
+        .section .text.bar,"ax",@progbits
+        .type bar, @function
+bar:
+        .global bar
+        ret
+
+        .section .text.ifunc,"ax",@progbits
+        .type ifunc, @gnu_indirect_function
+ifunc:
+        ret
diff --git a/ld/testsuite/ld-ifunc/ifunc-10-x86-64.d b/ld/testsuite/ld-ifunc/ifunc-10-x86-64.d
new file mode 100644
index 0000000..8ece379
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-10-x86-64.d
@@ -0,0 +1,6 @@
+#ld: -m elf_x86_64 -e bar --gc-sections
+#as: --64
+#readelf: -r --wide
+#target: x86_64-*-*
+
+There are no relocations in this file.
diff --git a/ld/testsuite/ld-ifunc/ifunc-10-x86-64.s b/ld/testsuite/ld-ifunc/ifunc-10-x86-64.s
new file mode 100644
index 0000000..ea6f8c2
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-10-x86-64.s
@@ -0,0 +1,20 @@
+        .section .text.foo,"ax",@progbits
+        .type foo, @function
+foo:
+        .global foo
+        movl ifunc@GOTPCREL(%rip), %eax
+        movl ifunc(%rip), %eax
+	call ifunc@PLT
+	call ifunc
+        ret
+
+        .section .text.bar,"ax",@progbits
+        .type bar, @function
+bar:
+        .global bar
+        ret
+
+        .section .text.ifunc,"ax",@progbits
+        .type ifunc, @gnu_indirect_function
+ifunc:
+        ret
diff --git a/ld/testsuite/ld-ifunc/ifunc-11-i386.d b/ld/testsuite/ld-ifunc/ifunc-11-i386.d
new file mode 100644
index 0000000..5f56b24
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-11-i386.d
@@ -0,0 +1,6 @@
+#ld: -m elf_i386 -e bar --gc-sections
+#as: --32
+#readelf: -r --wide
+#target: x86_64-*-* i?86-*-*
+
+There are no relocations in this file.
diff --git a/ld/testsuite/ld-ifunc/ifunc-11-i386.s b/ld/testsuite/ld-ifunc/ifunc-11-i386.s
new file mode 100644
index 0000000..06f5924
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-11-i386.s
@@ -0,0 +1,21 @@
+        .section .text.foo,"ax",@progbits
+        .type foo, @function
+foo:
+        .global foo
+        movl ifunc@GOT(%ecx), %eax
+	movl ifunc@GOTOFF(%ecx), %eax
+	call ifunc@PLT
+	call ifunc
+        ret
+
+        .section .text.bar,"ax",@progbits
+        .type bar, @function
+bar:
+        .global bar
+        ret
+
+        .section .text.ifunc,"ax",@progbits
+        .type ifunc, @gnu_indirect_function
+        .global ifunc
+ifunc:
+        ret
diff --git a/ld/testsuite/ld-ifunc/ifunc-11-x86-64.d b/ld/testsuite/ld-ifunc/ifunc-11-x86-64.d
new file mode 100644
index 0000000..8ece379
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-11-x86-64.d
@@ -0,0 +1,6 @@
+#ld: -m elf_x86_64 -e bar --gc-sections
+#as: --64
+#readelf: -r --wide
+#target: x86_64-*-*
+
+There are no relocations in this file.
diff --git a/ld/testsuite/ld-ifunc/ifunc-11-x86-64.s b/ld/testsuite/ld-ifunc/ifunc-11-x86-64.s
new file mode 100644
index 0000000..70d4fbf
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-11-x86-64.s
@@ -0,0 +1,21 @@
+        .section .text.foo,"ax",@progbits
+        .type foo, @function
+foo:
+        .global foo
+        movl ifunc@GOTPCREL(%rip), %eax
+        movl ifunc(%rip), %eax
+	call ifunc@PLT
+	call ifunc
+        ret
+
+        .section .text.bar,"ax",@progbits
+        .type bar, @function
+bar:
+        .global bar
+        ret
+
+        .section .text.ifunc,"ax",@progbits
+        .type ifunc, @gnu_indirect_function
+        .global ifunc
+ifunc:
+        ret