Add support for Hexagon

This implements initial support for the Hexagon architecture. The
Hexagon ABI spec can be seen at
https://lists.llvm.org/pipermail/llvm-dev/attachments/20190916/21516a52/attachment-0001.pdf

A hello_hexagon.ko test is also added.

$ head tests/test-suite.log
  [...]
  # TOTAL: 275
  # PASS:  269
  # SKIP:  6
  # XFAIL: 0
  # FAIL:  0
  # XPASS: 0
  # ERROR: 0

$ cat tests/run-strip-reloc-ko.sh.log
  [...]
  runtest hello_hexagon.ko
  PASS run-strip-reloc-ko.sh (exit status: 0)

	* backends/Makefile.am (modules): Add hexagon.
	(hexagon_SRCS): New var for hexagon_init.c and hexagon_symbol.c.
	(libebl_backends_a_SOURCES): Add hexagon_SRCS.
	* backends/hexagon_init.c: New file.
	* backends/hexagon_reloc.def: Likewise.
	* backends/hexagon_symbol.c: Likewise.
	* libebl/eblopenbackend.c (hexagon_init): Declare.
	(machines): Add hexagon.
	* libelf/elf-knowledge.h: Add hexagon e_flags values, section
        indices and and relocs.
	* src/elflint.c (valid_e_machine): Add EM_QDSP6.
	* tests/Makefile.am (EXTRA_DIST): Add hello_hexagon.ko.bz2.
	* tests/hello_hexagon.ko.bz2: New test file.
	* tests/run-strip-reloc-ko.sh: Add hello_hexagon.ko.

Signed-off-by: Matheus Tavares Bernardino <[email protected]>

4 files changed, 244 insertions, 2 deletions

diff --git a/backends/Makefile.am b/backends/Makefile.am
index b946fd30..e22b522c 100644
--- a/backends/Makefile.am
+++ b/backends/Makefile.am
@@ -37,7 +37,7 @@ AM_CPPFLAGS += -I$(top_srcdir)/libebl -I$(top_srcdir)/libasm \
 noinst_LIBRARIES = libebl_backends.a libebl_backends_pic.a
 
 modules = i386 sh x86_64 ia64 alpha arm aarch64 sparc ppc ppc64 s390 \
-	  m68k bpf riscv csky loongarch arc mips
+	  m68k bpf riscv csky loongarch arc mips hexagon
 
 i386_SRCS = i386_init.c i386_symbol.c i386_corenote.c i386_cfi.c \
 	    i386_retval.c i386_regs.c i386_auxv.c \
@@ -104,12 +104,15 @@ arc_SRCS = arc_init.c arc_symbol.c
 
 mips_SRCS = mips_init.c mips_symbol.c
 
+hexagon_SRCS = hexagon_init.c hexagon_symbol.c
+
 libebl_backends_a_SOURCES = $(i386_SRCS) $(sh_SRCS) $(x86_64_SRCS) \
 			    $(ia64_SRCS) $(alpha_SRCS) $(arm_SRCS) \
 			    $(aarch64_SRCS) $(sparc_SRCS) $(ppc_SRCS) \
 			    $(ppc64_SRCS) $(s390_SRCS) \
 			    $(m68k_SRCS) $(bpf_SRCS) $(riscv_SRCS) $(csky_SRCS) \
-			    $(loongarch_SRCS) $(arc_SRCS) $(mips_SRCS)
+			    $(loongarch_SRCS) $(arc_SRCS) $(mips_SRCS) \
+			    $(hexagon_SRCS)
 
 libebl_backends_pic_a_SOURCES =
 am_libebl_backends_pic_a_OBJECTS = $(libebl_backends_a_SOURCES:.c=.os)
diff --git a/backends/hexagon_init.c b/backends/hexagon_init.c
new file mode 100644
index 00000000..9c8c6d8d
--- /dev/null
+++ b/backends/hexagon_init.c
@@ -0,0 +1,51 @@
+/* Initialization of Hexagon specific backend library.
+   Copyright (C) 2024 Qualcomm Innovation Center, Inc. All Rights Reserved.
+   This file is part of elfutils.
+
+   This file is free software; you can redistribute it and/or modify
+   it under the terms of either
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at
+       your option) any later version
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at
+       your option) any later version
+
+   or both in parallel, as here.
+
+   elfutils is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#define BACKEND         hexagon_
+#define RELOC_PREFIX    R_HEX_
+#include "libebl_CPU.h"
+
+/* This defines the common reloc hooks based on hexagon_reloc.def.  */
+#include "common-reloc.c"
+
+
+Ebl *
+hexagon_init (Elf *elf __attribute__ ((unused)),
+                GElf_Half machine __attribute__ ((unused)),
+                Ebl *eh)
+{
+  hexagon_init_reloc (eh);
+  HOOK (eh, reloc_simple_type);
+
+  return eh;
+}
+
diff --git a/backends/hexagon_reloc.def b/backends/hexagon_reloc.def
new file mode 100644
index 00000000..cd55d374
--- /dev/null
+++ b/backends/hexagon_reloc.def
@@ -0,0 +1,130 @@
+/* List the relocation types for Hexagon.  -*- C -*-
+   Copyright (C) 2024 Qualcomm Innovation Center, Inc. All Rights Reserved.
+   This file is part of elfutils.
+
+   This file is free software; you can redistribute it and/or modify
+   it under the terms of either
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at
+       your option) any later version
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at
+       your option) any later version
+
+   or both in parallel, as here.
+
+   elfutils is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+/*          NAME,                     REL|EXEC|DYN */
+
+RELOC_TYPE (NONE,                     0)
+RELOC_TYPE (B22_PCREL,                REL)
+RELOC_TYPE (B15_PCREL,                REL)
+RELOC_TYPE (B7_PCREL,                 REL)
+RELOC_TYPE (LO16,                     REL)
+RELOC_TYPE (HI16,                     REL)
+RELOC_TYPE (32,                       REL)
+RELOC_TYPE (16,                       REL)
+RELOC_TYPE (8,                        REL)
+RELOC_TYPE (GPREL16_0,                REL)
+RELOC_TYPE (GPREL16_1,                REL)
+RELOC_TYPE (GPREL16_2,                REL)
+RELOC_TYPE (GPREL16_3,                REL)
+RELOC_TYPE (HL16,                     REL)
+RELOC_TYPE (B13_PCREL,                REL)
+RELOC_TYPE (B9_PCREL,                 REL)
+RELOC_TYPE (B32_PCREL_X,              REL)
+RELOC_TYPE (32_6_X,                   REL)
+RELOC_TYPE (B22_PCREL_X,              REL)
+RELOC_TYPE (B15_PCREL_X,              REL)
+RELOC_TYPE (B13_PCREL_X,              REL)
+RELOC_TYPE (B9_PCREL_X,               REL)
+RELOC_TYPE (B7_PCREL_X,               REL)
+RELOC_TYPE (16_X,                     REL)
+RELOC_TYPE (12_X,                     REL)
+RELOC_TYPE (11_X,                     REL)
+RELOC_TYPE (10_X,                     REL)
+RELOC_TYPE (9_X,                      REL)
+RELOC_TYPE (8_X,                      REL)
+RELOC_TYPE (7_X,                      REL)
+RELOC_TYPE (6_X,                      REL)
+RELOC_TYPE (32_PCREL,                 REL)
+RELOC_TYPE (COPY,                     REL)
+RELOC_TYPE (GLOB_DAT,                 REL)
+RELOC_TYPE (JMP_SLOT,                 REL)
+RELOC_TYPE (RELATIVE,                 REL)
+RELOC_TYPE (PLT_B22_PCREL,            REL)
+RELOC_TYPE (GOTREL_LO16,              REL)
+RELOC_TYPE (GOTREL_HI16,              REL)
+RELOC_TYPE (GOTREL_32,                REL)
+RELOC_TYPE (GOT_LO16,                 REL)
+RELOC_TYPE (GOT_HI16,                 REL)
+RELOC_TYPE (GOT_32,                   REL)
+RELOC_TYPE (GOT_16,                   REL)
+RELOC_TYPE (DTPMOD_32,                REL)
+RELOC_TYPE (DTPREL_LO16,              REL)
+RELOC_TYPE (DTPREL_HI16,              REL)
+RELOC_TYPE (DTPREL_32,                REL)
+RELOC_TYPE (DTPREL_16,                REL)
+RELOC_TYPE (GD_PLT_B22_PCREL,         REL)
+RELOC_TYPE (GD_GOT_LO16,              REL)
+RELOC_TYPE (GD_GOT_HI16,              REL)
+RELOC_TYPE (GD_GOT_32,                REL)
+RELOC_TYPE (GD_GOT_16,                REL)
+RELOC_TYPE (IE_LO16,                  REL)
+RELOC_TYPE (IE_HI16,                  REL)
+RELOC_TYPE (IE_32,                    REL)
+RELOC_TYPE (IE_GOT_LO16,              REL)
+RELOC_TYPE (IE_GOT_HI16,              REL)
+RELOC_TYPE (IE_GOT_32,                REL)
+RELOC_TYPE (IE_GOT_16,                REL)
+RELOC_TYPE (TPREL_LO16,               REL)
+RELOC_TYPE (TPREL_HI16,               REL)
+RELOC_TYPE (TPREL_32,                 REL)
+RELOC_TYPE (TPREL_16,                 REL)
+RELOC_TYPE (6_PCREL_X,                REL)
+RELOC_TYPE (GOTREL_32_6_X,            REL)
+RELOC_TYPE (GOTREL_16_X,              REL)
+RELOC_TYPE (GOTREL_11_X,              REL)
+RELOC_TYPE (GOT_32_6_X,               REL)
+RELOC_TYPE (GOT_16_X,                 REL)
+RELOC_TYPE (GOT_11_X,                 REL)
+RELOC_TYPE (DTPREL_32_6_X,            REL)
+RELOC_TYPE (DTPREL_16_X,              REL)
+RELOC_TYPE (DTPREL_11_X,              REL)
+RELOC_TYPE (GD_GOT_32_6_X,            REL)
+RELOC_TYPE (GD_GOT_16_X,              REL)
+RELOC_TYPE (GD_GOT_11_X,              REL)
+RELOC_TYPE (IE_32_6_X,                REL)
+RELOC_TYPE (IE_16_X,                  REL)
+RELOC_TYPE (IE_GOT_32_6_X,            REL)
+RELOC_TYPE (IE_GOT_16_X,              REL)
+RELOC_TYPE (IE_GOT_11_X,              REL)
+RELOC_TYPE (TPREL_32_6_X,             REL)
+RELOC_TYPE (TPREL_16_X,               REL)
+RELOC_TYPE (TPREL_11_X,               REL)
+RELOC_TYPE (LD_PLT_B22_PCREL,         REL)
+RELOC_TYPE (LD_GOT_LO16,              REL)
+RELOC_TYPE (LD_GOT_HI16,              REL)
+RELOC_TYPE (LD_GOT_32,                REL)
+RELOC_TYPE (LD_GOT_16,                REL)
+RELOC_TYPE (LD_GOT_32_6_X,            REL)
+RELOC_TYPE (LD_GOT_16_X,              REL)
+RELOC_TYPE (LD_GOT_11_X,              REL)
+RELOC_TYPE (23_REG,                   REL)
+RELOC_TYPE (GD_PLT_B22_PCREL_X,       REL)
+RELOC_TYPE (GD_PLT_B32_PCREL_X,       REL)
+RELOC_TYPE (LD_PLT_B22_PCREL_X,       REL)
+RELOC_TYPE (LD_PLT_B32_PCREL_X,       REL)
+RELOC_TYPE (27_REG,                   REL)
diff --git a/backends/hexagon_symbol.c b/backends/hexagon_symbol.c
new file mode 100644
index 00000000..b341243e
--- /dev/null
+++ b/backends/hexagon_symbol.c
@@ -0,0 +1,58 @@
+/* Hexagon specific symbolic name handling.
+   Copyright (C) 2024 Qualcomm Innovation Center, Inc. All Rights Reserved.
+   This file is part of elfutils.
+
+   This file is free software; you can redistribute it and/or modify
+   it under the terms of either
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at
+       your option) any later version
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at
+       your option) any later version
+
+   or both in parallel, as here.
+
+   elfutils is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <assert.h>
+#include <elf.h>
+#include <stddef.h>
+#include <string.h>
+
+#define BACKEND hexagon_
+#include "libebl_CPU.h"
+
+
+/* Check for the simple reloc types.  */
+Elf_Type
+hexagon_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type,
+                             int *addsub __attribute__ ((unused)))
+{
+  switch (type)
+    {
+    case R_HEX_32:
+      return ELF_T_WORD;
+    case R_HEX_16:
+      return ELF_T_HALF;
+    case R_HEX_8:
+      return ELF_T_BYTE;
+    default:
+      return ELF_T_NUM;
+    }
+}