PowerPC64 treatment of absolute symbols

Supporting -static-pie on PowerPC64 requires the linker to properly
treat SHN_ABS symbols for cases like glibc's _nl_current_LC_CTYPE_used
absolute symbol.  I've been slow to fix the linker on powerpc because
there is some chance that this will break some shared libraries or
PIEs.

bfd/
	* elf64-ppc.c (ppc64_elf_check_relocs): Consolidate local sym
	handling code.  Don't count dyn relocs against non-dynamic
	absolute symbols.
	(dec_dynrel_count): Adjust to suit.
	(ppc64_elf_edit_toc): Don't remove entries for absolute symbols
	when pic.
	(allocate_got): Don't allocate space for got relocs against
	non-dynamic absolute syms.
	(ppc64_elf_layout_multitoc): Likewise.
	(got_and_plt_relr): Likewise.
	(ppc64_elf_size_dynamic_sections): Likewise for local got.
	(got_and_plt_relr_for_local_syms): Likewise.
	(ppc64_elf_size_stubs): Don't allocate space for relr either.
	(ppc64_elf_relocate_section): Don't write relocs against non-dynamic
	absolute symbols.  Don't optimise got and toc code sequences
	loading absolute symbol entries.
ld/
	* testsuite/ld-powerpc/abs-reloc.s,
	* testsuite/ld-powerpc/abs-static.d,
	* testsuite/ld-powerpc/abs-static.r,
	* testsuite/ld-powerpc/abs-pie.d,
	* testsuite/ld-powerpc/abs-pie.r,
	* testsuite/ld-powerpc/abs-shared.d,
	* testsuite/ld-powerpc/abs-shared.r,
	* testsuite/ld-powerpc/abs-pie-relr.d,
	* testsuite/ld-powerpc/abs-pie-relr.r,
	* testsuite/ld-powerpc/abs-shared-relr.d,
	* testsuite/ld-powerpc/abs-shared-relr.r: New tests.
	* testsuite/ld-powerpc/powerpc.exp: Run them.

ld/testsuite/ld-powerpc/abs-pie-relr.d

@@ -0,0 +1,34 @@
+#source: abs-reloc.s
+#as: -a64
+#ld: -melf64ppc -pie --hash-style=sysv -z pack-relative-relocs --defsym a=1 --defsym 'HIDDEN(b=2)' --defsym c=0x123456789abcdef0
+#objdump: -sdr
+
+#...
+Contents of section .got:
+.* (00000000 00018300|00830100 00000000) (00000000 00000001|01000000 00000000) .*
+.* (00000000 00000002|02000000 00000000) (12345678 9abcdef0|f0debc9a 78563412) .*
+.* (00000000 00000002|02000000 00000000) (12345678 9abcdef0|f0debc9a 78563412) .*
+.* (00000000 00000001|01000000 00000000) .*
+Contents of section \.data:
+.* (00000000 00010338|38030100 00000000) (00000000 00000001|01000000 00000000) .*
+.* (00000000 00000002|02000000 00000000) (12345678 9abcdef0|f0debc9a 78563412) .*
+#...
+.* <_start>:
+.*:	(3c 4c 00 02|02 00 4c 3c) 	addis   r2,r12,2
+.*:	(38 42 81 58|58 81 42 38) 	addi    r2,r2,-32424
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(38 62 80 38|38 80 62 38) 	addi    r3,r2,-32712
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(e8 82 80 08|08 80 82 e8) 	ld      r4,-32760\(r2\)
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(e8 a2 80 10|10 80 a2 e8) 	ld      r5,-32752\(r2\)
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(e8 c2 80 18|18 80 c2 e8) 	ld      r6,-32744\(r2\)
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(38 e2 80 38|38 80 e2 38) 	addi    r7,r2,-32712
+.*:	(3d 02 00 00|00 00 02 3d) 	addis   r8,r2,0
+.*:	(e9 08 80 30|30 80 08 e9) 	ld      r8,-32720\(r8\)
+.*:	(3d 22 00 00|00 00 22 3d) 	addis   r9,r2,0
+.*:	(e9 29 80 20|20 80 29 e9) 	ld      r9,-32736\(r9\)
+.*:	(3d 42 00 00|00 00 42 3d) 	addis   r10,r2,0
+.*:	(e9 4a 80 28|28 80 4a e9) 	ld      r10,-32728\(r10\)

ld/testsuite/ld-powerpc/abs-pie-relr.r

@@ -0,0 +1,8 @@
+#source: abs-reloc.s
+#as: -a64
+#ld: -melf64ppc -pie --hash-style=sysv -z pack-relative-relocs --defsym a=1 --defsym 'HIDDEN(b=2)' --defsym c=0x123456789abcdef0
+#readelf: -rW
+
+Relocation section '\.relr\.dyn' at offset .* contains 1 entry:
+  1 offset
+0+10338

ld/testsuite/ld-powerpc/abs-pie.d

@@ -0,0 +1,34 @@
+#source: abs-reloc.s
+#as: -a64
+#ld: -melf64ppc -pie --hash-style=sysv --defsym a=1 --defsym 'HIDDEN(b=2)' --defsym c=0x123456789abcdef0
+#objdump: -sdr
+
+#...
+Contents of section \.got:
+.* (00000000 00018400|00840100 00000000) (00000000 00000001|01000000 00000000) .*
+.* (00000000 00000002|02000000 00000000) (12345678 9abcdef0|f0debc9a 78563412) .*
+.* (00000000 00000002|02000000 00000000) (12345678 9abcdef0|f0debc9a 78563412) .*
+.* (00000000 00000001|01000000 00000000) .*
+Contents of section \.data:
+.* (00000000 00010438|38040100 00000000) (00000000 00000001|01000000 00000000) .*
+.* (00000000 00000002|02000000 00000000) (12345678 9abcdef0|f0debc9a 78563412) .*
+#...
+.* <_start>:
+.*:	(3c 4c 00 02|02 00 4c 3c) 	addis   r2,r12,2
+.*:	(38 42 82 10|10 82 42 38) 	addi    r2,r2,-32240
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(38 62 80 38|38 80 62 38) 	addi    r3,r2,-32712
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(e8 82 80 08|08 80 82 e8) 	ld      r4,-32760\(r2\)
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(e8 a2 80 10|10 80 a2 e8) 	ld      r5,-32752\(r2\)
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(e8 c2 80 18|18 80 c2 e8) 	ld      r6,-32744\(r2\)
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(38 e2 80 38|38 80 e2 38) 	addi    r7,r2,-32712
+.*:	(3d 02 00 00|00 00 02 3d) 	addis   r8,r2,0
+.*:	(e9 08 80 30|30 80 08 e9) 	ld      r8,-32720\(r8\)
+.*:	(3d 22 00 00|00 00 22 3d) 	addis   r9,r2,0
+.*:	(e9 29 80 20|20 80 29 e9) 	ld      r9,-32736\(r9\)
+.*:	(3d 42 00 00|00 00 42 3d) 	addis   r10,r2,0
+.*:	(e9 4a 80 28|28 80 4a e9) 	ld      r10,-32728\(r10\)

ld/testsuite/ld-powerpc/abs-pie.r

@@ -0,0 +1,8 @@
+#source: abs-reloc.s
+#as: -a64
+#ld: -melf64ppc -pie --hash-style=sysv --defsym a=1 --defsym 'HIDDEN(b=2)' --defsym c=0x123456789abcdef0
+#readelf: -rW
+
+Relocation section '\.rela\.dyn' at offset .* contains 1 entry:
+ +Offset +Info +Type +Symbol's Value +Symbol's Name \+ Addend
+0+10438 +0+16 R_PPC64_RELATIVE +10438

ld/testsuite/ld-powerpc/abs-reloc.s

@@ -0,0 +1,49 @@
+ .globl x
+ .hidden x
+
+ .section .toc,"aw"
+ .p2align 3
+.Lx:
+ .quad x
+.La:
+ .quad a
+.Lb:
+ .quad b
+.Lc:
+ .quad c
+
+ .data
+ .p2align 3
+x:
+ .quad x
+ .quad a
+ .quad b
+ .quad c
+
+ .text
+ .p2align 2
+ .globl _start
+ .type _start,@function
+_start:
+0:
+ addis 2,12,.TOC.-0b@ha
+ addi 2,2,.TOC.-0b@l
+ .localentry _start,.-_start
+ addis 3,2,.Lx@toc@ha
+ ld 3,.Lx@toc@l(3)
+ addis 4,2,.La@toc@ha
+ ld 4,.La@toc@l(4)
+ addis 5,2,.Lb@toc@ha
+ ld 5,.Lb@toc@l(5)
+ addis 6,2,.Lc@toc@ha
+ ld 6,.Lc@toc@l(6)
+
+ addis 7,2,x@got@ha
+ ld 7,x@got@l(7)
+ addis 8,2,a@got@ha
+ ld 8,a@got@l(8)
+ addis 9,2,b@got@ha
+ ld 9,b@got@l(9)
+ addis 10,2,c@got@ha
+ ld 10,c@got@l(10)
+ .size _start,.-_start

ld/testsuite/ld-powerpc/abs-shared-relr.d

@@ -0,0 +1,34 @@
+#source: abs-reloc.s
+#as: -a64
+#ld: -melf64ppc -shared --hash-style=sysv -z pack-relative-relocs --defsym a=1 --defsym 'HIDDEN(b=2)' --defsym c=0x123456789abcdef0
+#objdump: -sdr
+
+#...
+Contents of section \.got:
+.* (00000000 00018400|00840100 00000000) 00000000 00000000 .*
+.* (00000000 00000002|02000000 00000000) 00000000 00000000 .*
+.* (00000000 00000002|02000000 00000000) 00000000 00000000 .*
+.* 00000000 00000000 .*
+Contents of section \.data:
+.* (00000000 00010438|38040100 00000000) 00000000 00000000 .*
+.* (00000000 00000002|02000000 00000000) 00000000 00000000 .*
+#...
+.* <_start>:
+.*:	(3c 4c 00 02|02 00 4c 3c) 	addis   r2,r12,2
+.*:	(38 42 81 b0|b0 81 42 38) 	addi    r2,r2,-32336
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(38 62 80 38|38 80 62 38) 	addi    r3,r2,-32712
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(e8 82 80 08|08 80 82 e8) 	ld      r4,-32760\(r2\)
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(e8 a2 80 10|10 80 a2 e8) 	ld      r5,-32752\(r2\)
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(e8 c2 80 18|18 80 c2 e8) 	ld      r6,-32744\(r2\)
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(38 e2 80 38|38 80 e2 38) 	addi    r7,r2,-32712
+.*:	(3d 02 00 00|00 00 02 3d) 	addis   r8,r2,0
+.*:	(e9 08 80 30|30 80 08 e9) 	ld      r8,-32720\(r8\)
+.*:	(3d 22 00 00|00 00 22 3d) 	addis   r9,r2,0
+.*:	(e9 29 80 20|20 80 29 e9) 	ld      r9,-32736\(r9\)
+.*:	(3d 42 00 00|00 00 42 3d) 	addis   r10,r2,0
+.*:	(e9 4a 80 28|28 80 4a e9) 	ld      r10,-32728\(r10\)

ld/testsuite/ld-powerpc/abs-shared-relr.r

@@ -0,0 +1,17 @@
+#source: abs-reloc.s
+#as: -a64
+#ld: -melf64ppc -pie --hash-style=sysv -z pack-relative-relocs --defsym a=1 --defsym 'HIDDEN(b=2)' --defsym c=0x123456789abcdef0
+#readelf: -rW
+
+Relocation section '\.rela\.dyn' at offset .* contains 6 entries:
+ +Offset +Info +Type +Symbol's Value +Symbol's Name \+ Addend
+0+10408  0+500000026 R_PPC64_ADDR64         0+1 a \+ 0
+0+10430  0+500000014 R_PPC64_GLOB_DAT       0+1 a \+ 0
+0+10440  0+500000026 R_PPC64_ADDR64         0+1 a \+ 0
+0+10418  0+400000026 R_PPC64_ADDR64         123456789abcdef0 c \+ 0
+0+10428  0+400000014 R_PPC64_GLOB_DAT       123456789abcdef0 c \+ 0
+0+10450  0+400000026 R_PPC64_ADDR64         123456789abcdef0 c \+ 0
+
+Relocation section '\.relr\.dyn' at offset .* contains 1 entry:
+  1 offset
+0+10438

ld/testsuite/ld-powerpc/abs-shared.d

@@ -0,0 +1,34 @@
+#source: abs-reloc.s
+#as: -a64
+#ld: -melf64ppc -shared --hash-style=sysv --defsym a=1 --defsym 'HIDDEN(b=2)' --defsym c=0x123456789abcdef0
+#objdump: -sdr
+
+#...
+Contents of section \.got:
+.* (00000000 00018400|00840100 00000000) 00000000 00000000 .*
+.* (00000000 00000002|02000000 00000000) 00000000 00000000 .*
+.* (00000000 00000002|02000000 00000000) 00000000 00000000 .*
+.* 00000000 00000000 .*
+Contents of section \.data:
+.* (00000000 00010438|38040100 00000000) 00000000 00000000 .*
+.* (00000000 00000002|02000000 00000000) 00000000 00000000 .*
+#...
+.* <_start>:
+.*:	(3c 4c 00 02|02 00 4c 3c) 	addis   r2,r12,2
+.*:	(38 42 81 a0|a0 81 42 38) 	addi    r2,r2,-32352
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(38 62 80 38|38 80 62 38) 	addi    r3,r2,-32712
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(e8 82 80 08|08 80 82 e8) 	ld      r4,-32760\(r2\)
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(e8 a2 80 10|10 80 a2 e8) 	ld      r5,-32752\(r2\)
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(e8 c2 80 18|18 80 c2 e8) 	ld      r6,-32744\(r2\)
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(38 e2 80 38|38 80 e2 38) 	addi    r7,r2,-32712
+.*:	(3d 02 00 00|00 00 02 3d) 	addis   r8,r2,0
+.*:	(e9 08 80 30|30 80 08 e9) 	ld      r8,-32720\(r8\)
+.*:	(3d 22 00 00|00 00 22 3d) 	addis   r9,r2,0
+.*:	(e9 29 80 20|20 80 29 e9) 	ld      r9,-32736\(r9\)
+.*:	(3d 42 00 00|00 00 42 3d) 	addis   r10,r2,0
+.*:	(e9 4a 80 28|28 80 4a e9) 	ld      r10,-32728\(r10\)

ld/testsuite/ld-powerpc/abs-shared.r

@@ -0,0 +1,14 @@
+#source: abs-reloc.s
+#as: -a64
+#ld: -melf64ppc -shared --hash-style=sysv --defsym a=1 --defsym 'HIDDEN(b=2)' --defsym c=0x123456789abcdef0
+#readelf: -rW
+
+Relocation section '\.rela\.dyn' at offset .* contains 7 entries:
+ +Offset +Info +Type +Symbol's Value +Symbol's Name \+ Addend
+0+10438  0+000000016 R_PPC64_RELATIVE +10438
+0+10408  0+500000026 R_PPC64_ADDR64         0+1 a \+ 0
+0+10430  0+500000014 R_PPC64_GLOB_DAT       0+1 a \+ 0
+0+10440  0+500000026 R_PPC64_ADDR64         0+1 a \+ 0
+0+10418  0+400000026 R_PPC64_ADDR64         123456789abcdef0 c \+ 0
+0+10428  0+400000014 R_PPC64_GLOB_DAT       123456789abcdef0 c \+ 0
+0+10450  0+400000026 R_PPC64_ADDR64         123456789abcdef0 c \+ 0

ld/testsuite/ld-powerpc/abs-static.d

@@ -0,0 +1,32 @@
+#source: abs-reloc.s
+#as: -a64
+#ld: -melf64ppc -static --defsym a=1 --defsym 'HIDDEN(b=2)' --defsym c=0x123456789abcdef0
+#objdump: -sdr
+
+#...
+Contents of section \.got:
+.* (00000000 10018100|00810110 00000000) (12345678 9abcdef0|f0debc9a 78563412) .*
+.* (12345678 9abcdef0|f0debc9a 78563412) .*
+Contents of section \.data:
+.* (00000000 10010118|18010110 00000000) (00000000 00000001|01000000 00000000) .*
+.* (00000000 00000002|02000000 00000000) (12345678 9abcdef0|f0debc9a 78563412) .*
+#...
+.* <_start>:
+.*:	(3c 40 10 02|02 10 40 3c) 	lis     r2,4098
+.*:	(38 42 81 00|00 81 42 38) 	addi    r2,r2,-32512
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(38 62 80 18|18 80 62 38) 	addi    r3,r2,-32744
+.*:	(3c 82 ef fe|fe ef 82 3c) 	addis   r4,r2,-4098
+.*:	(38 84 7f 01|01 7f 84 38) 	addi    r4,r4,32513
+.*:	(3c a2 ef fe|fe ef a2 3c) 	addis   r5,r2,-4098
+.*:	(38 a5 7f 02|02 7f a5 38) 	addi    r5,r5,32514
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(e8 c2 80 08|08 80 c2 e8) 	ld      r6,-32760\(r2\)
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(38 e2 80 18|18 80 e2 38) 	addi    r7,r2,-32744
+.*:	(3d 02 ef fe|fe ef 02 3d) 	addis   r8,r2,-4098
+.*:	(39 08 7f 01|01 7f 08 39) 	addi    r8,r8,32513
+.*:	(3d 22 ef fe|fe ef 22 3d) 	addis   r9,r2,-4098
+.*:	(39 29 7f 02|02 7f 29 39) 	addi    r9,r9,32514
+.*:	(60 00 00 00|00 00 00 60) 	nop
+.*:	(e9 42 80 10|10 80 42 e9) 	ld      r10,-32752\(r2\)

ld/testsuite/ld-powerpc/abs-static.r

@@ -0,0 +1,6 @@
+#source: abs-reloc.s
+#as: -a64
+#ld: -melf64ppc -static --defsym a=1 --defsym 'HIDDEN(b=2)' --defsym c=0x123456789abcdef0
+#readelf: -rW
+
+There are no relocations in this file.

ld/testsuite/ld-powerpc/powerpc.exp

@@ -354,6 +354,26 @@ set ppc64elftests {
     {"startstop" "-shared -melf64ppc --hash-style=sysv --gc-sections -z start-stop-gc" ""
 	"-a64 -mpower10" {startstop.s}
 	{{objdump -d startstop.d} {readelf {-rW} startstop.r}} "startstop.so"}
+    {"abs-static" "-melf64ppc -static --defsym a=1 --defsym 'HIDDEN(b=2)' --defsym c=0x123456789abcdef0" ""
+	"-a64" {abs-reloc.s}
+	{{objdump {-sdr} abs-static.d}
+	 {readelf {-rW} abs-static.r}} "abs-static"}
+    {"abs-pie" "-melf64ppc -pie --hash-style=sysv --defsym a=1 --defsym 'HIDDEN(b=2)' --defsym c=0x123456789abcdef0" ""
+	"-a64" {abs-reloc.s}
+	{{objdump {-sdr} abs-pie.d}
+	 {readelf {-rW} abs-pie.r}} "abs-pie"}
+    {"abs-shared" "-melf64ppc -shared --hash-style=sysv --defsym a=1 --defsym 'HIDDEN(b=2)' --defsym c=0x123456789abcdef0" ""
+	"-a64" {abs-reloc.s}
+	{{objdump {-sdr} abs-shared.d}
+	 {readelf {-rW} abs-shared.r}} "abs-shared"}
+    {"abs-pie-relr" "-melf64ppc -pie --hash-style=sysv -z pack-relative-relocs --defsym a=1 --defsym 'HIDDEN(b=2)' --defsym c=0x123456789abcdef0" ""
+	"-a64" {abs-reloc.s}
+	{{objdump {-sdr} abs-pie-relr.d}
+	 {readelf {-rW} abs-pie-relr.r}} "abs-pie-relr"}
+    {"abs-shared-relr" "-melf64ppc -shared --hash-style=sysv -z pack-relative-relocs --defsym a=1 --defsym 'HIDDEN(b=2)' --defsym c=0x123456789abcdef0" ""
+	"-a64" {abs-reloc.s}
+	{{objdump {-sdr} abs-shared-relr.d}
+	 {readelf {-rW} abs-shared-relr.r}} "abs-shared-relr"}
 }
 
 set ppceabitests {