Add 2 i386 tests to call IFUNC functions via GOT

bfd/

	* elf32-i386.c (elf_i386_relocate_section): Simplify IFUNC
	GOT32 adjustment for static executables.

ld/

2016-06-13  H.J. Lu  <hongjiu.lu@intel.com>

	* testsuite/ld-i386/i386.exp: Run ifunc-1a and ifunc-1b.
	* testsuite/ld-i386/ifunc-1a.c: New file.
	* testsuite/ld-i386/ifunc-1b.S: Likewise.
	* testsuite/ld-i386/ifunc-1c.S: Likewise.
	* testsuite/ld-i386/ifunc-1d.S: Likewise.

5 files changed, 188 insertions, 0 deletions

diff --git a/ld/testsuite/ld-i386/i386.exp b/ld/testsuite/ld-i386/i386.exp
index a6efa53..93f11ef 100644
--- a/ld/testsuite/ld-i386/i386.exp
+++ b/ld/testsuite/ld-i386/i386.exp
@@ -809,6 +809,42 @@ if { [isnative]
     undefined_weak "-fPIE" "-pie -z nodynamic-undefined-weak"
 }
 
+# Must be native with the C compiler and working IFUNC support,
+if { [isnative]
+     && [check_ifunc_available]
+     && [istarget "i?86-*-*"]
+     && [which $CC] != 0 } {
+    run_cc_link_tests [list \
+	[list \
+	    "Build ifunc-1a.o ifunc-1b.o ifunc-1c.o ifunc-1d.o" \
+	    "" \
+	    "-fPIC -O2 -g" \
+	    { ifunc-1a.c ifunc-1b.S ifunc-1c.S ifunc-1d.S } \
+	] \
+    ]
+
+    run_ld_link_exec_tests [] [list \
+	[list \
+	    "Run ifunc-1a" \
+	    "tmpdir/ifunc-1a.o tmpdir/ifunc-1b.o \
+	     tmpdir/ifunc-1c.o tmpdir/ifunc-1d.o" \
+	    "" \
+	    { dummy.c } \
+	    "ifunc-1a" \
+	    "pass.out" \
+	] \
+	[list \
+	    "Run ifunc-1b" \
+	    "--static tmpdir/ifunc-1a.o tmpdir/ifunc-1b.o \
+	    tmpdir/ifunc-1c.o tmpdir/ifunc-1d.o" \
+	    "" \
+	    { dummy.c } \
+	    "ifunc-1b" \
+	    "pass.out" \
+	] \
+    ]
+}
+
 if { !([istarget "i?86-*-linux*"]
        || [istarget "x86_64-*-linux*"]) } {
     return
diff --git a/ld/testsuite/ld-i386/ifunc-1a.c b/ld/testsuite/ld-i386/ifunc-1a.c
new file mode 100644
index 0000000..370275a
--- /dev/null
+++ b/ld/testsuite/ld-i386/ifunc-1a.c
@@ -0,0 +1,8 @@
+extern void check (void);
+
+int
+main ()
+{
+  check ();
+  return 0;
+}
diff --git a/ld/testsuite/ld-i386/ifunc-1b.S b/ld/testsuite/ld-i386/ifunc-1b.S
new file mode 100644
index 0000000..802a36d
--- /dev/null
+++ b/ld/testsuite/ld-i386/ifunc-1b.S
@@ -0,0 +1,42 @@
+	.section	.rodata.str1.1,"aMS",@progbits,1
+.LC0:
+	.string	"PASS"
+	.text
+	.p2align 4,,15
+	.globl	check
+	.type	check, @function
+check:
+	pushl	%ebx
+	call	__x86.get_pc_thunk.bx
+	addl	$_GLOBAL_OFFSET_TABLE_, %ebx
+	subl	$8, %esp
+	call	*get_func1@GOT(%ebx)
+	cmpl	func1@GOT(%ebx), %eax
+	jne	.L3
+	call	*func1@GOT(%ebx)
+	cmpl	$1, %eax
+	jne	.L3
+	call	*call_func1@GOT(%ebx)
+	cmpl	$1, %eax
+	jne	.L3
+	call	*call_func2@GOT(%ebx)
+	cmpl	$2, %eax
+	jne	.L3
+	leal	.LC0@GOTOFF(%ebx), %eax
+	subl	$12, %esp
+	pushl	%eax
+	call	*puts@GOT(%ebx)
+	addl	$24, %esp
+	popl	%ebx
+	ret
+.L3:
+	call	*abort@GOT(%ebx)
+	.size	check, .-check
+	.section	.text.__x86.get_pc_thunk.bx,"axG",@progbits,__x86.get_pc_thunk.bx,comdat
+	.globl	__x86.get_pc_thunk.bx
+	.hidden	__x86.get_pc_thunk.bx
+	.type	__x86.get_pc_thunk.bx, @function
+__x86.get_pc_thunk.bx:
+	movl	(%esp), %ebx
+	ret
+	.section	.note.GNU-stack,"",@progbits
diff --git a/ld/testsuite/ld-i386/ifunc-1c.S b/ld/testsuite/ld-i386/ifunc-1c.S
new file mode 100644
index 0000000..b00f128
--- /dev/null
+++ b/ld/testsuite/ld-i386/ifunc-1c.S
@@ -0,0 +1,26 @@
+	.text
+	.p2align 4,,15
+	.globl	get_func1
+	.type	get_func1, @function
+get_func1:
+	call	__x86.get_pc_thunk.ax
+	addl	$_GLOBAL_OFFSET_TABLE_, %eax
+	movl	func1@GOT(%eax), %eax
+	ret
+	.size	get_func1, .-get_func1
+	.p2align 4,,15
+	.globl	call_func1
+	.type	call_func1, @function
+call_func1:
+	call	__x86.get_pc_thunk.ax
+	addl	$_GLOBAL_OFFSET_TABLE_, %eax
+	jmp	*func1@GOT(%eax)
+	.size	call_func1, .-call_func1
+	.section	.text.__x86.get_pc_thunk.ax,"axG",@progbits,__x86.get_pc_thunk.ax,comdat
+	.globl	__x86.get_pc_thunk.ax
+	.hidden	__x86.get_pc_thunk.ax
+	.type	__x86.get_pc_thunk.ax, @function
+__x86.get_pc_thunk.ax:
+	movl	(%esp), %eax
+	ret
+	.section	.note.GNU-stack,"",@progbits
diff --git a/ld/testsuite/ld-i386/ifunc-1d.S b/ld/testsuite/ld-i386/ifunc-1d.S
new file mode 100644
index 0000000..28f262e
--- /dev/null
+++ b/ld/testsuite/ld-i386/ifunc-1d.S
@@ -0,0 +1,76 @@
+	.text
+	.p2align 4,,15
+	.type	implementation1, @function
+implementation1:
+	movl	$1, %eax
+	ret
+	.size	implementation1, .-implementation1
+	.p2align 4,,15
+	.type	implementation2, @function
+implementation2:
+	movl	$2, %eax
+	ret
+	.size	implementation2, .-implementation2
+	.p2align 4,,15
+	.type	resolver2, @function
+resolver2:
+	call	__x86.get_pc_thunk.ax
+	addl	$_GLOBAL_OFFSET_TABLE_, %eax
+	leal	implementation2@GOTOFF(%eax), %eax
+	ret
+	.size	resolver2, .-resolver2
+	.type	func2, @gnu_indirect_function
+	.set	func2,resolver2
+	.p2align 4,,15
+	.type	resolver1, @function
+resolver1:
+	call	__x86.get_pc_thunk.ax
+	addl	$_GLOBAL_OFFSET_TABLE_, %eax
+	leal	implementation1@GOTOFF(%eax), %eax
+	ret
+	.size	resolver1, .-resolver1
+	.globl	func1
+	.type	func1, @gnu_indirect_function
+	.set	func1,resolver1
+	.p2align 4,,15
+	.globl	get_func2
+	.type	get_func2, @function
+get_func2:
+	call	__x86.get_pc_thunk.ax
+	addl	$_GLOBAL_OFFSET_TABLE_, %eax
+	movl	func2@GOT(%eax), %eax
+	ret
+	.size	get_func2, .-get_func2
+	.p2align 4,,15
+	.globl	call_func2
+	.type	call_func2, @function
+call_func2:
+	pushl	%ebx
+	call	__x86.get_pc_thunk.bx
+	addl	$_GLOBAL_OFFSET_TABLE_, %ebx
+	subl	$8, %esp
+	call	*get_func2@GOT(%ebx)
+	cmpl	func2@GOT(%ebx), %eax
+	jne	.L10
+	addl	$8, %esp
+	movl	%ebx, %eax
+	popl	%ebx
+	jmp	*func2@GOT(%eax)
+.L10:
+	call	*abort@GOT(%ebx)
+	.size	call_func2, .-call_func2
+	.section	.text.__x86.get_pc_thunk.ax,"axG",@progbits,__x86.get_pc_thunk.ax,comdat
+	.globl	__x86.get_pc_thunk.ax
+	.hidden	__x86.get_pc_thunk.ax
+	.type	__x86.get_pc_thunk.ax, @function
+__x86.get_pc_thunk.ax:
+	movl	(%esp), %eax
+	ret
+	.section	.text.__x86.get_pc_thunk.bx,"axG",@progbits,__x86.get_pc_thunk.bx,comdat
+	.globl	__x86.get_pc_thunk.bx
+	.hidden	__x86.get_pc_thunk.bx
+	.type	__x86.get_pc_thunk.bx, @function
+__x86.get_pc_thunk.bx:
+	movl	(%esp), %ebx
+	ret
+	.section	.note.GNU-stack,"",@progbits