X32: Place .plt.got section after .plt section

This patch places .plt.got section after .plt section for x32.

	* emulparams/elf32_x86_64.sh (TINY_READONLY_SECTION): New.
	* testsuite/ld-x86-64/pr20830.d: Renamed to ...
	* testsuite/ld-x86-64/pr20830a.d: This.  Updated.
	* testsuite/ld-x86-64/pr20830b.d: New file.
	* testsuite/ld-x86-64/x86-64.exp: Rename pr20830 to pr20830a.
	Run pr20830b.

ld/ChangeLog

@@ -1,3 +1,12 @@
+2017-01-10  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* emulparams/elf32_x86_64.sh (TINY_READONLY_SECTION): New.
+	* testsuite/ld-x86-64/pr20830.d: Renamed to ...
+	* testsuite/ld-x86-64/pr20830a.d: This.  Updated.
+	* testsuite/ld-x86-64/pr20830b.d: New file.
+	* testsuite/ld-x86-64/x86-64.exp: Rename pr20830 to pr20830a.
+	Run pr20830b.
+
 2017-01-10  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR ld/20830

ld/emulparams/elf32_x86_64.sh

@@ -21,6 +21,10 @@ LARGE_SECTIONS=yes
 LARGE_BSS_AFTER_BSS=
 SEPARATE_GOTPLT="SIZEOF (.got.plt) >= 24 ? 24 : 0"
 IREL_IN_PLT=
+# Reuse TINY_READONLY_SECTION which is placed right after .plt section.
+TINY_READONLY_SECTION="
+.plt.got      ${RELOCATING-0} : { *(.plt.got) }
+"
 
 if [ "x${host}" = "x${target}" ]; then
   case " $EMULATION_LIBPATH " in

ld/testsuite/ld-x86-64/pr20830a.d

@@ -1,4 +1,5 @@
 #name: PR ld/20830 (.plt.got)
+#source: pr20830.s
 #as: --64
 #ld: -melf_x86_64 -shared -z relro --ld-generated-unwind-info
 #objdump: -dw -Wf

ld/testsuite/ld-x86-64/pr20830b.d

@@ -0,0 +1,66 @@
+#name: PR ld/20830 (.plt.got)
+#source: pr20830.s
+#as: --x32
+#ld: -melf32_x86_64 -shared -z relro --ld-generated-unwind-info
+#objdump: -dw -Wf
+
+.*: +file format .*
+
+Contents of the .eh_frame section:
+
+0+ 0000000000000014 00000000 CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 1
+  Data alignment factor: -8
+  Return address column: 16
+  Augmentation data:     1b
+
+  DW_CFA_def_cfa: r7 \(rsp\) ofs 8
+  DW_CFA_offset: r16 \(rip\) at cfa-8
+  DW_CFA_nop
+  DW_CFA_nop
+
+0+18 0000000000000010 0000001c FDE cie=00000000 pc=0000000000000188..0000000000000194
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+0+2c ZERO terminator
+
+
+0+30 0000000000000020 00000034 FDE cie=00000000 pc=0000000000000170..0000000000000180
+  DW_CFA_def_cfa_offset: 16
+  DW_CFA_advance_loc: 6 to 0000000000000176
+  DW_CFA_def_cfa_offset: 24
+  DW_CFA_advance_loc: 10 to 0000000000000180
+  DW_CFA_def_cfa_expression \(DW_OP_breg7 \(rsp\): 8; DW_OP_breg16 \(rip\): 0; DW_OP_lit15; DW_OP_and; DW_OP_lit11; DW_OP_ge; DW_OP_lit3; DW_OP_shl; DW_OP_plus\)
+
+0+54 ZERO terminator
+
+
+0+58 0000000000000010 0000005c FDE cie=00000000 pc=0000000000000180..0000000000000188
+  DW_CFA_nop
+  DW_CFA_nop
+  DW_CFA_nop
+
+
+Disassembly of section .plt:
+
+0+170 <.plt>:
+ +[a-f0-9]+:	ff 35 92 0e 20 00    	pushq  0x200e92\(%rip\)        # 201008 <_GLOBAL_OFFSET_TABLE_\+0x8>
+ +[a-f0-9]+:	ff 25 94 0e 20 00    	jmpq   \*0x200e94\(%rip\)        # 201010 <_GLOBAL_OFFSET_TABLE_\+0x10>
+ +[a-f0-9]+:	0f 1f 40 00          	nopl   0x0\(%rax\)
+
+Disassembly of section .plt.got:
+
+0+180 <.plt.got>:
+ +[a-f0-9]+:	ff 25 72 0e 20 00    	jmpq   \*0x200e72\(%rip\)        # 200ff8 <func>
+ +[a-f0-9]+:	66 90                	xchg   %ax,%ax
+
+Disassembly of section .text:
+
+0+188 <foo>:
+ +[a-f0-9]+:	e8 f3 ff ff ff       	callq  180 <.plt.got>
+ +[a-f0-9]+:	48 8b 05 64 0e 20 00 	mov    0x200e64\(%rip\),%rax        # 200ff8 <func>
+#pass

ld/testsuite/ld-x86-64/x86-64.exp

@@ -1019,4 +1019,5 @@ if { ![istarget "x86_64-*-linux*"]} {
 run_dump_test "pr17618"
 run_dump_test "pltgot-1"
 run_dump_test "pltgot-2"
-run_dump_test "pr20830"
+run_dump_test "pr20830a"
+run_dump_test "pr20830b"