Add support for non-contiguous memory regions

2020-01-06  Christophe Lyon  <christophe.lyon@linaro.org>

	bfd/
	* bfd-in2.h: Regenerate.
	* section.c (asection): Add already_assigned field.
	(BFD_FAKE_SECTION): Add default initializer for it.
	* ecoff.c (bfd_debug_section): Initialize already_assigned field.
	* elf32-arm.c (arm_build_one_stub): Add support for
	non_contiguous_regions.
	* elf32-csky.c (csky_build_one_stub): Likewise.
	* elf32-hppa.c (hppa_build_one_stub): Likewise.
	* elf32-m68hc11.c (m68hc11_elf_build_one_stub): Likewise.
	* elf32-m68hc12.c (m68hc12_elf_build_one_stub): Likewise.
	* elf32-metag.c (metag_build_one_stub): Likewise.
	* elf32-nios2.c (nios2_build_one_stub): Likewise.
	* elf64-ppc.c (ppc_build_one_stub): Likewise.
	(ppc_size_one_stub): Likewise.
	* elfnn-aarch64.c (aarch64_build_one_stub): Likewise.
	* elflink.c (elf_link_input_bfd): Likewise.

	include/
	* bfdlink.h (bfd_link_info): Add non_contiguous_regions and
	non_contiguous_regions_warnings fields.

	ld/
	* ldlang.c (lang_add_section): Add support for
	non_contiguous_regions.
	(size_input_section): Likewise.
	(lang_size_sections_1): Likewise.
	(process_insert_statements): Likewise.
	* ldlex.h (option_values): Add OPTION_NON_CONTIGUOUS_REGIONS and
	OPTION_NON_CONTIGUOUS_REGIONS_WARNINGS.
	* lexsup.c (ld_options): Add entries for
	--enable-non-contiguous-regions and
	--enable-non-contiguous-regions-warnings.
	(parse_args): Handle it.
	* NEWS: Add --enable-non-contiguous-regions and
	--enable-non-contiguous-regions-warnings.
	* ld.texi: Add --enable-non-contiguous-regions and
	--enable-non-contiguous-regions-warnings documentation.
	* emultempl/armelf.em (elf32_arm_add_stub_section): Add
	SEC_LINKER_CREATED flag.
	* emultempl/xtensaelf.em (ld_build_required_section_dependence):
	Emit an error when --enable-non-contiguous-regions is used.
	* testsuite/ld-elf/non-contiguous.d: New.
	* testsuite/ld-elf/non-contiguous.ld: New.
	* testsuite/ld-elf/non-contiguous.s: New.
	* testsuite/ld-arm/arm-elf.exp: Run the new tests.
	* testsuite/ld-arm/arm-elf/non-contiguous-arm.s: New.
	* testsuite/ld-arm/arm-elf/non-contiguous-arm.d: New.
	* testsuite/ld-arm/arm-elf/non-contiguous-arm.ld: New.
	* testsuite/ld-arm/arm-elf/non-contiguous-arm2.d: New.
	* testsuite/ld-arm/arm-elf/non-contiguous-arm3.ld: New.
	* testsuite/ld-arm/arm-elf/non-contiguous-arm3.d: New.
	* testsuite/ld-arm/arm-elf/non-contiguous-arm3.ld: New.
	* testsuite/ld-arm/arm-elf/non-contiguous-arm4.d: New.
	* testsuite/ld-arm/arm-elf/non-contiguous-arm4.ld: New.
	* testsuite/ld-arm/arm-elf/non-contiguous-arm5.d: New.
	* testsuite/ld-arm/arm-elf/non-contiguous-arm5.ld: New.
	* testsuite/ld-arm/arm-elf/non-contiguous-arm6.d: New.
	* testsuite/ld-arm/arm-elf/non-contiguous-arm6.ld: New.
	* testsuite/ld-powerpc/powerpc.exp: Run new tests.
	* testsuite/ld-powerpc/non-contiguous-powerpc.d: New.
	* testsuite/ld-powerpc/non-contiguous-powerpc.ld: New.
	* testsuite/ld-powerpc/non-contiguous-powerpc.sd: New.
	* testsuite/ld-powerpc/non-contiguous-powerpc64.d: New.

5 files changed, 43 insertions, 0 deletions

diff --git a/ld/testsuite/ld-powerpc/non-contiguous-powerpc.d b/ld/testsuite/ld-powerpc/non-contiguous-powerpc.d
new file mode 100644
index 0000000..858e353
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/non-contiguous-powerpc.d
@@ -0,0 +1,5 @@
+#name: non-contiguous-powerpc
+#source: non-contiguous-powerpc.s
+#ld: --enable-non-contiguous-regions -T non-contiguous-powerpc.ld
+#error: \ARelaxation not supported with --enable-non-contiguous-regions.*
+#skip: powerpc64*-*
diff --git a/ld/testsuite/ld-powerpc/non-contiguous-powerpc.ld b/ld/testsuite/ld-powerpc/non-contiguous-powerpc.ld
new file mode 100644
index 0000000..744d246
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/non-contiguous-powerpc.ld
@@ -0,0 +1,22 @@
+/* Distance between 'one' and 'two' means that relaxation implies that
+   .text.one's size increases. Even though the result would fit in
+   'oneandhalf', this is not supported by
+   --enable-non-contiguous-regions.  */
+
+MEMORY {
+       one (RXAI) : ORIGIN = 0x00000000, LENGTH = 0x00000010
+       oneandhalf (RXAI) : ORIGIN = 0x00001000, LENGTH = 0x00001010
+       two (RXAI) : ORIGIN = 0x20000000, LENGTH = 0x10000000
+}
+
+SECTIONS {
+      one : {
+         *(.text.one)
+      } > one
+      oneandhalf : {
+         *(.text.one)
+      } > oneandhalf
+      two : {
+      *(.text.two)
+      } > two
+}
diff --git a/ld/testsuite/ld-powerpc/non-contiguous-powerpc.s b/ld/testsuite/ld-powerpc/non-contiguous-powerpc.s
new file mode 100644
index 0000000..e02b322
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/non-contiguous-powerpc.s
@@ -0,0 +1,8 @@
+	.machine "ppc"
+
+	.section .text.one
+	b	2f
+
+	.section .text.two
+2:
+	nop
diff --git a/ld/testsuite/ld-powerpc/non-contiguous-powerpc64.d b/ld/testsuite/ld-powerpc/non-contiguous-powerpc64.d
new file mode 100644
index 0000000..ff0e3fc
--- /dev/null
+++ b/ld/testsuite/ld-powerpc/non-contiguous-powerpc64.d
@@ -0,0 +1,5 @@
+#name: non-contiguous-powerpc64
+#source: non-contiguous-powerpc.s
+#as: -a64
+#ld: -melf64ppc --enable-non-contiguous-regions -T non-contiguous-powerpc.ld
+#error: .*Could not assign group.*
diff --git a/ld/testsuite/ld-powerpc/powerpc.exp b/ld/testsuite/ld-powerpc/powerpc.exp
index 94b2fac..84d7c9c 100644
--- a/ld/testsuite/ld-powerpc/powerpc.exp
+++ b/ld/testsuite/ld-powerpc/powerpc.exp
@@ -405,6 +405,7 @@ if [ supports_ppc64 ] then {
     run_dump_test "tlsgd"
     run_dump_test "tlsld"
     run_dump_test "tlsie"
+    run_dump_test "non-contiguous-powerpc64"
 }
 
 run_dump_test "localgot"
@@ -443,3 +444,5 @@ run_dump_test "vle-multiseg-6"
 
 run_dump_test "ppc476-shared"
 run_dump_test "ppc476-shared2"
+
+run_dump_test "non-contiguous-powerpc"