RISC-V: Implement support for big endian targets.

RISC-V instruction/code is always little endian, but data might be
big-endian.  Therefore, we can not use the original bfd_get/bfd_put
to get/put the code for big endian targets.  Add new riscv_get_insn
and riscv_put_insn to always get/put code as little endian can resolve
the problem.  Just remember to update them once we have supported
the 48-bit/128-bit instructions in the future patches.

bfd/
    * config.bfd: Added targets riscv64be*-*-*, riscv32be*-*-* and
    riscvbe*-*-*.  Also added riscv_elf[32|64]_be_vec.
    * configure.ac: Handle riscv_elf[32|64]_be_vec.
    * configure: Regenerate.
    * elfnn-riscv.c: Include <limits.h> and define CHAR_BIT for
    riscv_is_insn_reloc.
    (riscv_get_insn): RISC-V instructions are always little endian, but
    bfd_get may be used for big-endian, so add new riscv_get_insn to handle
    the insturctions.
    (riscv_put_insn): Likewsie.
    (riscv_is_insn_reloc): Check if we are relocaing an instruction.
    (perform_relocation): Call riscv_is_insn_reloc to decide if we should
    use riscv_[get|put]_insn or bfd_[get|put].
    (riscv_zero_pcrel_hi_reloc): Use riscv_[get|put]_insn, bfd_[get|put]l32
    or bfd_[get|put]l16 for code.
    (riscv_elf_relocate_section): Likewise.
    (riscv_elf_finish_dynamic_symbol): Likewise.
    (riscv_elf_finish_dynamic_sections): Likewise.
    (_bfd_riscv_relax_call): Likewise.
    (_bfd_riscv_relax_lui): Likewise.
    (_bfd_riscv_relax_align): Likewise.
    (_bfd_riscv_relax_pc): Likewise.
    (riscv_elf_object_p): Handled for big endian.
    (TARGET_BIG_SYM, TARGET_BIG_NAME): Defined.
    * targets.c: Add riscv_elf[32|64]_be_vec.
    (_bfd_target_vector): Likewise.

gas/
    * config/tc-riscv.c (riscv_target_format): Add elf64-bigriscv and
    elf32-bigriscv.
    (install_insn): Always write instructions as little endian.
    (riscv_make_nops): Likewise.
    (md_convert_frag_branch): Likewise.
    (md_number_to_chars): Write data in target endianness.
    (options, md_longopts): Add -mbig-endian and -mlittle-endian options.
    (md_parse_option): Handle the endian options.
    * config/tc-riscv.h: Only define TARGET_BYTES_BIG_ENDIAN if not
    already defined.
    * configure.tgt: Added riscv64be*, riscv32be*, riscvbe*.

ld/
    * configure.tgt: Added riscvbe-*-*, riscv32be*-*-*, riscv64be*-*-*,
    riscv32be*-*-linux*, and riscv64be*-*-linux*.
    * Makefile.am: Added eelf32briscv.c, eelf32briscv_ilp32f.c and
    eelf32briscv_ilp32.c.
    * Makefile.in: Regenerate.
    * emulparams/elf32briscv.sh: Added.
    * emulparams/elf32briscv_ilp32.sh: Likewise.
    * emulparams/elf32briscv_ilp32f.sh: Likewise.
    * emulparams/elf64briscv.sh: Likewise.
    * emulparams/elf64briscv_lp64.sh: Likewise.
    * emulparams/elf64briscv_lp64f.sh: Likewise.

10 files changed, 78 insertions, 4 deletions

diff --git a/ld/ChangeLog b/ld/ChangeLog
index b939f61..2e51333 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,17 @@
+2021-01-06  Marcus Comstedt  <marcus@mc.pp.se>
+
+	* configure.tgt: Added riscvbe-*-*, riscv32be*-*-*, riscv64be*-*-*,
+	riscv32be*-*-linux*, and riscv64be*-*-linux*.
+	* Makefile.am: Added eelf32briscv.c, eelf32briscv_ilp32f.c and
+	eelf32briscv_ilp32.c.
+	* Makefile.in: Regenerate.
+	* emulparams/elf32briscv.sh: Added.
+	* emulparams/elf32briscv_ilp32.sh: Likewise.
+	* emulparams/elf32briscv_ilp32f.sh: Likewise.
+	* emulparams/elf64briscv.sh: Likewise.
+	* emulparams/elf64briscv_lp64.sh: Likewise.
+	* emulparams/elf64briscv_lp64f.sh: Likewise.
+
 2021-01-05  Nick Alcock  <nick.alcock@oracle.com>
 
 	* testsuite/ld-ctf/enum-forward.c: New test.
diff --git a/ld/Makefile.am b/ld/Makefile.am
index 241df9f..2c9a487 100644
--- a/ld/Makefile.am
+++ b/ld/Makefile.am
@@ -266,6 +266,9 @@ ALL_EMULATION_SOURCES = \
 	eelf32lriscv.c \
 	eelf32lriscv_ilp32f.c \
 	eelf32lriscv_ilp32.c \
+	eelf32briscv.c \
+	eelf32briscv_ilp32f.c \
+	eelf32briscv_ilp32.c \
 	eelf32rl78.c \
 	eelf32rx.c \
 	eelf32rx_linux.c \
@@ -435,6 +438,9 @@ ALL_64_EMULATION_SOURCES = \
 	eelf64lriscv.c \
 	eelf64lriscv_lp64f.c \
 	eelf64lriscv_lp64.c \
+	eelf64briscv.c \
+	eelf64briscv_lp64f.c \
+	eelf64briscv_lp64.c \
 	eelf64ltsmip.c \
 	eelf64ltsmip_fbsd.c \
 	eelf64mmix.c \
@@ -751,6 +757,9 @@ $(ALL_EMULATION_SOURCES) $(ALL_64_EMULATION_SOURCES): $(GEN_DEPENDS)
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32lriscv.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32lriscv_ilp32f.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32lriscv_ilp32.Pc@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32briscv.Pc@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32briscv_ilp32f.Pc@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32briscv_ilp32.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32rl78.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32rx.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32rx_linux.Pc@am__quote@
@@ -916,6 +925,9 @@ $(ALL_EMULATION_SOURCES) $(ALL_64_EMULATION_SOURCES): $(GEN_DEPENDS)
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64lriscv.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64lriscv_lp64f.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64lriscv_lp64.Pc@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64briscv.Pc@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64briscv_lp64f.Pc@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64briscv_lp64.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64ltsmip.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64ltsmip_fbsd.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64mmix.Pc@am__quote@
diff --git a/ld/Makefile.in b/ld/Makefile.in
index 8d6738a..c1c42aa 100644
--- a/ld/Makefile.in
+++ b/ld/Makefile.in
@@ -521,6 +521,7 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
+runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
@@ -755,6 +756,9 @@ ALL_EMULATION_SOURCES = \
 	eelf32lriscv.c \
 	eelf32lriscv_ilp32f.c \
 	eelf32lriscv_ilp32.c \
+	eelf32briscv.c \
+	eelf32briscv_ilp32f.c \
+	eelf32briscv_ilp32.c \
 	eelf32rl78.c \
 	eelf32rx.c \
 	eelf32rx_linux.c \
@@ -923,6 +927,9 @@ ALL_64_EMULATION_SOURCES = \
 	eelf64lriscv.c \
 	eelf64lriscv_lp64f.c \
 	eelf64lriscv_lp64.c \
+	eelf64briscv.c \
+	eelf64briscv_lp64f.c \
+	eelf64briscv_lp64.c \
 	eelf64ltsmip.c \
 	eelf64ltsmip_fbsd.c \
 	eelf64mmix.c \
@@ -1318,6 +1325,9 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32bfinfd.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32bmip.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32bmipn32.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32briscv.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32briscv_ilp32.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32briscv_ilp32f.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32bsmip.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32btsmip.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32btsmip_fbsd.Po@am__quote@
@@ -1403,6 +1413,9 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64alpha_nbsd.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64bmip.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64bpf.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64briscv.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64briscv_lp64.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64briscv_lp64f.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64btsmip.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64btsmip_fbsd.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64hppa.Po@am__quote@
@@ -2403,6 +2416,9 @@ $(ALL_EMULATION_SOURCES) $(ALL_64_EMULATION_SOURCES): $(GEN_DEPENDS)
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32lriscv.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32lriscv_ilp32f.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32lriscv_ilp32.Pc@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32briscv.Pc@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32briscv_ilp32f.Pc@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32briscv_ilp32.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32rl78.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32rx.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32rx_linux.Pc@am__quote@
@@ -2568,6 +2584,9 @@ $(ALL_EMULATION_SOURCES) $(ALL_64_EMULATION_SOURCES): $(GEN_DEPENDS)
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64lriscv.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64lriscv_lp64f.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64lriscv_lp64.Pc@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64briscv.Pc@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64briscv_lp64f.Pc@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64briscv_lp64.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64ltsmip.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64ltsmip_fbsd.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf64mmix.Pc@am__quote@
diff --git a/ld/configure.tgt b/ld/configure.tgt
index 893d2da..0c780b2 100644
--- a/ld/configure.tgt
+++ b/ld/configure.tgt
@@ -738,21 +738,38 @@ powerpc-*-windiss*)	targ_emul=elf32ppcwindiss
 			;;
 pru*-*-*)		targ_emul=pruelf
 			;;
+riscv32be*-*-linux*)	targ_emul=elf32briscv
+			targ_extra_emuls="elf32briscv_ilp32f elf32briscv_ilp32 elf64briscv elf64briscv_lp64f elf64briscv_lp64 elf32lriscv elf32lriscv_ilp32f elf32lriscv_ilp32 elf64lriscv elf64lriscv_lp64f elf64lriscv_lp64"
+			targ_extra_libpath=$targ_extra_emuls
+			;;
 riscv32*-*-linux*)	targ_emul=elf32lriscv
-			targ_extra_emuls="elf32lriscv_ilp32f elf32lriscv_ilp32 elf64lriscv elf64lriscv_lp64f elf64lriscv_lp64"
+			targ_extra_emuls="elf32lriscv_ilp32f elf32lriscv_ilp32 elf64lriscv elf64lriscv_lp64f elf64lriscv_lp64 elf32briscv elf32briscv_ilp32f elf32briscv_ilp32 elf64briscv elf64briscv_lp64f elf64briscv_lp64"
+			targ_extra_libpath=$targ_extra_emuls
+			;;
+riscvbe-*-* | riscv32be*-*-*)
+			targ_emul=elf32briscv
+			targ_extra_emuls="elf64briscv elf32lriscv elf64lriscv"
 			targ_extra_libpath=$targ_extra_emuls
 			;;
 riscv-*-* | riscv32*-*-*)
 			targ_emul=elf32lriscv
-			targ_extra_emuls="elf64lriscv"
+			targ_extra_emuls="elf64lriscv elf32briscv elf64briscv"
+			targ_extra_libpath=$targ_extra_emuls
+			;;
+riscv64be*-*-linux*)	targ_emul=elf64briscv
+			targ_extra_emuls="elf64briscv_lp64f elf64briscv_lp64 elf32briscv elf32briscv_ilp32f elf32briscv_ilp32 elf64lriscv elf64lriscv_lp64f elf64lriscv_lp64 elf32lriscv elf32lriscv_ilp32f elf32lriscv_ilp32"
 			targ_extra_libpath=$targ_extra_emuls
 			;;
 riscv64*-*-linux*)	targ_emul=elf64lriscv
-			targ_extra_emuls="elf64lriscv_lp64f elf64lriscv_lp64 elf32lriscv elf32lriscv_ilp32f elf32lriscv_ilp32"
+			targ_extra_emuls="elf64lriscv_lp64f elf64lriscv_lp64 elf32lriscv elf32lriscv_ilp32f elf32lriscv_ilp32 elf64briscv elf64briscv_lp64f elf64briscv_lp64 elf32briscv elf32briscv_ilp32f elf32briscv_ilp32"
+			targ_extra_libpath=$targ_extra_emuls
+			;;
+riscv64be*-*-*)		targ_emul=elf64briscv
+			targ_extra_emuls="elf32briscv elf64lriscv elf32lriscv"
 			targ_extra_libpath=$targ_extra_emuls
 			;;
 riscv64*-*-*)		targ_emul=elf64lriscv
-			targ_extra_emuls="elf32lriscv"
+			targ_extra_emuls="elf32lriscv elf64briscv elf32briscv"
 			targ_extra_libpath=$targ_extra_emuls
 			;;
 rs6000-*-aix[5-9]*)	targ_emul=aix5rs6
diff --git a/ld/emulparams/elf32briscv.sh b/ld/emulparams/elf32briscv.sh
new file mode 100644
index 0000000..bad02bd
--- /dev/null
+++ b/ld/emulparams/elf32briscv.sh
@@ -0,0 +1,2 @@
+source_sh ${srcdir}/emulparams/elf32lriscv.sh
+OUTPUT_FORMAT="elf32-bigriscv"
diff --git a/ld/emulparams/elf32briscv_ilp32.sh b/ld/emulparams/elf32briscv_ilp32.sh
new file mode 100644
index 0000000..c150108
--- /dev/null
+++ b/ld/emulparams/elf32briscv_ilp32.sh
@@ -0,0 +1,2 @@
+source_sh ${srcdir}/emulparams/elf32lriscv_ilp32.sh
+OUTPUT_FORMAT="elf32-bigriscv"
diff --git a/ld/emulparams/elf32briscv_ilp32f.sh b/ld/emulparams/elf32briscv_ilp32f.sh
new file mode 100644
index 0000000..52117e6
--- /dev/null
+++ b/ld/emulparams/elf32briscv_ilp32f.sh
@@ -0,0 +1,2 @@
+source_sh ${srcdir}/emulparams/elf32lriscv_ilp32f.sh
+OUTPUT_FORMAT="elf32-bigriscv"
diff --git a/ld/emulparams/elf64briscv.sh b/ld/emulparams/elf64briscv.sh
new file mode 100644
index 0000000..86a429f
--- /dev/null
+++ b/ld/emulparams/elf64briscv.sh
@@ -0,0 +1,2 @@
+source_sh ${srcdir}/emulparams/elf64lriscv.sh
+OUTPUT_FORMAT="elf64-bigriscv"
diff --git a/ld/emulparams/elf64briscv_lp64.sh b/ld/emulparams/elf64briscv_lp64.sh
new file mode 100644
index 0000000..b00717c
--- /dev/null
+++ b/ld/emulparams/elf64briscv_lp64.sh
@@ -0,0 +1,2 @@
+source_sh ${srcdir}/emulparams/elf64lriscv_lp64.sh
+OUTPUT_FORMAT="elf64-bigriscv"
diff --git a/ld/emulparams/elf64briscv_lp64f.sh b/ld/emulparams/elf64briscv_lp64f.sh
new file mode 100644
index 0000000..a54a3f4
--- /dev/null
+++ b/ld/emulparams/elf64briscv_lp64f.sh
@@ -0,0 +1,2 @@
+source_sh ${srcdir}/emulparams/elf64lriscv_lp64f.sh
+OUTPUT_FORMAT="elf64-bigriscv"