From 0f01145a89e6a294224c4693929487f45cc79225 Mon Sep 17 00:00:00 2001
From: d0p1 <contact@d0p1.eu>
Date: Thu, 11 Aug 2022 16:48:53 +0200
Subject: [PATCH] Add Athena base configuration

---
 bfd/archures.c               |   4 ++
 bfd/bfd-in2.h                |   2 +
 bfd/config.bfd               |   6 ++
 bfd/configure                |   1 +
 bfd/cpu-athena.c             |  65 +++++++++++++++++++
 bfd/elf32-athena.c           |  48 ++++++++++++++
 bfd/targets.c                |   3 +
 config.sub                   |   1 +
 gas/config/tc-athena.c       | 121 +++++++++++++++++++++++++++++++++++
 gas/config/tc-athena.h       |  34 ++++++++++
 gas/configure.tgt            |   3 +
 include/elf/common.h         |   1 +
 ld/Makefile.am               |   2 +
 ld/Makefile.in               |   2 +
 ld/configure.tgt             |   2 +
 ld/emulparams/elf32athena.sh |  10 +++
 opcodes/athena-dis.c         |   1 +
 opcodes/athena-opc.c         |   1 +
 opcodes/configure            |   1 +
 19 files changed, 308 insertions(+)
 create mode 100644 bfd/cpu-athena.c
 create mode 100644 bfd/elf32-athena.c
 create mode 100644 gas/config/tc-athena.c
 create mode 100644 gas/config/tc-athena.h
 create mode 100644 ld/emulparams/elf32athena.sh
 create mode 100644 opcodes/athena-dis.c
 create mode 100644 opcodes/athena-opc.c

diff --git a/bfd/archures.c b/bfd/archures.c
index c67bacddfdc..9dd6820573e 100644
--- a/bfd/archures.c
+++ b/bfd/archures.c
@@ -562,6 +562,8 @@ DESCRIPTION
 .#define bfd_mach_amdgcn_gfx1030 0x036
 .#define bfd_mach_amdgcn_gfx1031 0x037
 .#define bfd_mach_amdgcn_gfx1032 0x038
+.  bfd_arch_athena, {* Athena CPU *}
+.#define bfd_arch_athena 1
 .  bfd_arch_last
 .  };
 */
@@ -620,6 +622,7 @@ extern const bfd_arch_info_type bfd_alpha_arch;
 extern const bfd_arch_info_type bfd_amdgcn_arch;
 extern const bfd_arch_info_type bfd_arc_arch;
 extern const bfd_arch_info_type bfd_arm_arch;
+extern const bfd_arch_info_type bfd_athena_arch;
 extern const bfd_arch_info_type bfd_avr_arch;
 extern const bfd_arch_info_type bfd_bfin_arch;
 extern const bfd_arch_info_type bfd_cr16_arch;
@@ -708,6 +711,7 @@ static const bfd_arch_info_type * const bfd_archures_list[] =
     &bfd_amdgcn_arch,
     &bfd_arc_arch,
     &bfd_arm_arch,
+    &bfd_athena_arch,
     &bfd_avr_arch,
     &bfd_bfin_arch,
     &bfd_cr16_arch,
diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h
index 4ab7e2d6934..18b161e7531 100644
--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@@ -1387,6 +1387,8 @@ enum bfd_architecture
 {
   bfd_arch_unknown,   /* File arch not known.  */
   bfd_arch_obscure,   /* Arch known, not one of these.  */
+  bfd_arch_athena,    /* Athena */
+#define bfd_mach_athena                1
   bfd_arch_m68k,      /* Motorola 68xxx.  */
 #define bfd_mach_m68000                1
 #define bfd_mach_m68008                2
diff --git a/bfd/config.bfd b/bfd/config.bfd
index c514479b1f2..05b6f301051 100644
--- a/bfd/config.bfd
+++ b/bfd/config.bfd
@@ -184,6 +184,7 @@ alpha*)		 targ_archs=bfd_alpha_arch ;;
 am33_2.0*)	 targ_archs=bfd_mn10300_arch ;;
 arc*)		 targ_archs=bfd_arc_arch ;;
 arm*)		 targ_archs=bfd_arm_arch ;;
+athena*)         targ_archs=bfd_athena_arch ;;
 amdgcn*)	 targ_archs=bfd_amdgcn_arch ;;
 bfin*)		 targ_archs=bfd_bfin_arch ;;
 c30*)		 targ_archs=bfd_tic30_arch ;;
@@ -425,6 +426,11 @@ case "${targ}" in
     targ_selvecs=arm_elf32_be_vec
     ;;
 
+  athena-*-linux*)
+    targ_defvec=athena_elf32_vec
+    targ_selvecs=athena_elf32_vec
+    ;;
+
   avr-*-*)
     targ_defvec=avr_elf32_vec
     ;;
diff --git a/bfd/configure b/bfd/configure
index b5e44e6af79..2362b32bed1 100755
--- a/bfd/configure
+++ b/bfd/configure
@@ -13354,6 +13354,7 @@ do
     arm_pei_wince_be_vec)	 tb="$tb pei-arm-wince.lo pei-arm.lo peigen.lo $coff" ;;
     arm_pei_wince_le_vec)	 tb="$tb pei-arm-wince.lo pei-arm.lo peigen.lo $coff" ;;
     arm_mach_o_vec)		 tb="$tb mach-o-arm.lo" ;;
+    athena_elf32_vec)            tb="$tb elf32-athena.lo elf32.lo $elf" ;;
     avr_elf32_vec)		 tb="$tb elf32-avr.lo elf32.lo $elf" ;;
     bfin_elf32_vec)		 tb="$tb elf32-bfin.lo elf32.lo $elf" ;;
     bfin_elf32_fdpic_vec)	 tb="$tb elf32-bfin.lo elf32.lo $elf" ;;
diff --git a/bfd/cpu-athena.c b/bfd/cpu-athena.c
new file mode 100644
index 00000000000..625ce5b16d0
--- /dev/null
+++ b/bfd/cpu-athena.c
@@ -0,0 +1,65 @@
+/* BFD support for Athena.
+   Copyright (C) 2022 d0p1.
+
+   This file is part of BFD, the Binary File Descriptor library.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 a copy of the GNU General Public License
+   along with this program; see the file COPYING3. If not,
+   see <http://www.gnu.org/licenses/>.  */
+
+#include "sysdep.h"
+#include "bfd.h"
+#include "libbfd.h"
+
+const bfd_arch_info_type bfd_athena_arch =
+{
+	/* word size */
+	32,
+
+	/* address size */
+	32,
+
+	/* byte size */
+	8,
+
+	/* arch enum */
+	bfd_arch_athena,
+
+	/* machine num */
+	bfd_mach_athena,
+
+	/* arch name */
+	"athena",
+
+	/* printable name */
+	"Athena",
+
+	/* alligment */
+	4,
+
+	/* is default */
+	true,
+
+	/* default check compat */
+	bfd_default_compatible,
+
+	/* */
+	bfd_default_scan,
+
+	/* memory alloc */
+	bfd_arch_default_fill,
+
+	NULL,
+	
+	0
+};
diff --git a/bfd/elf32-athena.c b/bfd/elf32-athena.c
new file mode 100644
index 00000000000..b45cc87a5c0
--- /dev/null
+++ b/bfd/elf32-athena.c
@@ -0,0 +1,48 @@
+/* 32-bit ELF support for Athena.
+   Copyright (C) 2022 d0p1.
+
+   This file is part of BFD, the Binary File Descriptor library.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 a copy of the GNU General Public License
+   along with this program; see the file COPYING3. If not,
+   see <http://www.gnu.org/licenses/>.  */
+
+#include "sysdep.h"
+#include "bfd.h"
+#include "libbfd.h"
+#include "elf-bfd.h"
+
+static reloc_howto_type *
+bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
+				 bfd_reloc_code_real_type code)
+{
+	(void)code;
+  return NULL;
+}
+
+static reloc_howto_type *
+bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
+				 const char *r_name)
+{
+(void)r_name;
+  return NULL;
+}
+
+#define ELF_ARCH		bfd_arch_athena
+#define ELF_MAXPAGESIZE		4096
+#define ELF_MACHINE_CODE	EM_ATHENA
+
+#define TARGET_BIG_SYM		athena_elf32_vec
+#define TARGET_BIG_NAME		"elf32-athena"
+
+#include "elf32-target.h"
diff --git a/bfd/targets.c b/bfd/targets.c
index 8ad3ef366ce..8e5743f56fe 100644
--- a/bfd/targets.c
+++ b/bfd/targets.c
@@ -707,6 +707,7 @@ extern const bfd_target arm_pei_be_vec;
 extern const bfd_target arm_pei_le_vec;
 extern const bfd_target arm_pei_wince_be_vec;
 extern const bfd_target arm_pei_wince_le_vec;
+extern const bfd_target athena_elf32_vec;
 extern const bfd_target avr_elf32_vec;
 extern const bfd_target bfin_elf32_vec;
 extern const bfd_target bfin_elf32_fdpic_vec;
@@ -1033,6 +1034,8 @@ static const bfd_target * const _bfd_target_vector[] =
 	&arm_pei_wince_be_vec,
 	&arm_pei_wince_le_vec,
 
+	&athena_elf32_vec,
+
 	&avr_elf32_vec,
 
 	&bfin_elf32_vec,
diff --git a/config.sub b/config.sub
index dba16e84c77..293411be36d 100755
--- a/config.sub
+++ b/config.sub
@@ -1189,6 +1189,7 @@ case $cpu-$vendor in
 			| amdgcn \
 			| arc | arceb | arc32 | arc64 \
 			| arm | arm[lb]e | arme[lb] | armv* \
+			| athena \
 			| avr | avr32 \
 			| asmjs \
 			| ba \
diff --git a/gas/config/tc-athena.c b/gas/config/tc-athena.c
new file mode 100644
index 00000000000..3aabe36a6a9
--- /dev/null
+++ b/gas/config/tc-athena.c
@@ -0,0 +1,121 @@
+/* tc-athena.c -- Assemble for the Athena ISA
+
+   Copyright (C) 2022 d0p1.
+
+   This file is part of GAS.
+
+   GAS is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the license, or
+   (at your option) any later version.
+
+   GAS 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 a copy of the GNU General Public License
+   along with this program; see the file COPYING3. If not,
+   see <http://www.gnu.org/licenses/>.  */
+
+#include "as.h"
+#include "bfd.h"
+
+
+const char *md_shortopts = "";
+struct option md_longopts[] = {};
+size_t md_longopts_size = sizeof(md_longopts);
+
+const char comment_chars[] = "";
+const char line_comment_chars[] = "//";
+const char line_separator_chars[] = ";";
+
+const char EXP_CHARS[] = "";
+const char FLT_CHARS[] = "";
+
+const pseudo_typeS md_pseudo_table[] =
+{
+	{ NULL, NULL, 0 }
+};
+
+int md_parse_option(int c, const char *arg)
+{
+	(void)c;
+	(void)arg;
+	return (0);
+}
+
+void md_show_usage(FILE *stream)
+{
+	fprintf(stream, "Athena Hello\n");
+}
+
+void md_begin(void)
+{
+
+}
+
+void md_assemble(char *insn_str)
+{
+	(void)insn_str;
+}
+
+symbolS *md_undefined_symbol(char *name)
+{
+	(void)name;
+
+	return (NULL);
+}
+
+const char *md_atof(int type, char *lit, int *size)
+{
+	(void)type;
+	(void)lit;
+	(void)size;
+	return (NULL);
+}
+
+valueT md_section_align(asection *seg, valueT val)
+{
+	(void)seg;
+	(void)val;
+
+	return (0);
+}
+
+void md_convert_frag(bfd *abfd, asection *seg, fragS *fragp)
+{
+	(void)abfd;
+	(void)seg;
+	(void)fragp;
+}
+
+void md_apply_fix(fixS *fixp, valueT *val, segT seg)
+{
+	(void)fixp;
+	(void)val;
+	(void)seg;
+}
+
+arelent *tc_gen_reloc(asection *seg, fixS *fixp)
+{
+	(void)seg;
+	(void)fixp;
+
+	return (NULL);
+}
+
+long md_pcrel_from(fixS *fixp)
+{
+	(void)fixp;
+	return 0;
+}
+
+int md_estimate_size_before_relax(fragS *fragp, asection *seg)
+{
+	(void)fragp;
+	(void)seg;
+
+	as_fatal(_("wtf bro"));
+	return (0);
+}
diff --git a/gas/config/tc-athena.h b/gas/config/tc-athena.h
new file mode 100644
index 00000000000..aa73eea2828
--- /dev/null
+++ b/gas/config/tc-athena.h
@@ -0,0 +1,34 @@
+/* tc-athena.h -- Assemble for the Athena ISA
+
+   Copyright (C) 2022 d0p1.
+
+   This file is part of GAS.
+
+   GAS is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the license, or
+   (at your option) any later version.
+
+   GAS 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 a copy of the GNU General Public License
+   along with this program; see the file COPYING3. If not,
+   see <http://www.gnu.org/licenses/>.  */
+
+#ifndef TC_ATHENA_H
+#define TC_ATHENA_H
+
+#define TARGET_FORMAT "elf32-athena"
+#define TARGET_ARCH bfd_arch_athena
+#define TARGET_MARCH bfd_mach_athena
+
+
+#define md_operand(x)
+#define md_number_to_chars number_to_chars_bigendian
+#define WORKING_DOT_WORD
+
+
+#endif 
diff --git a/gas/configure.tgt b/gas/configure.tgt
index 62f806bdfe8..a8790c13437 100644
--- a/gas/configure.tgt
+++ b/gas/configure.tgt
@@ -53,6 +53,7 @@ case ${cpu} in
   arc*eb)		cpu_type=arc endian=big ;;
   arm*be|arm*b)		cpu_type=arm endian=big ;;
   arm*)			cpu_type=arm endian=little ;;
+  athena*)              cpu_type=athena endian=big ;;
   bfin*)		cpu_type=bfin endian=little ;;
   c4x*)			cpu_type=tic4x ;;
   cr16*)		cpu_type=cr16 endian=little ;;
@@ -166,6 +167,8 @@ case ${generic_target} in
   arm-*-fuchsia*)			fmt=elf ;;
   arm-*-haiku*)				fmt=elf em=haiku ;;
 
+  athena-*-*)                           fmt=elf ;;
+
   avr-*-*)				fmt=elf bfd_gas=yes ;;
 
   bfin-*-linux-uclibc)			fmt=fdpicelf em=linux ;;
diff --git a/include/elf/common.h b/include/elf/common.h
index ebcd8f9e82c..7f5ed7f0143 100644
--- a/include/elf/common.h
+++ b/include/elf/common.h
@@ -360,6 +360,7 @@
 #define EM_U16_U8CORE	260	/* LAPIS nX-U16/U8 */
 #define EM_TACHYUM	261	/* Tachyum */
 #define EM_56800EF	262	/* NXP 56800EF Digital Signal Controller (DSC) */
+#define EM_ATHENA    666
 
 /* If it is necessary to assign new unofficial EM_* values, please pick large
    random numbers (0x8523, 0xa7f2, etc.) to minimize the chances of collision
diff --git a/ld/Makefile.am b/ld/Makefile.am
index d31021c13e2..a01b59017fe 100644
--- a/ld/Makefile.am
+++ b/ld/Makefile.am
@@ -224,6 +224,7 @@ ALL_EMULATION_SOURCES = \
 	eelf32_tic6x_linux_be.c \
 	eelf32_tic6x_linux_le.c \
 	eelf32am33lin.c \
+	eelf32athena.c \
 	eelf32bfin.c \
 	eelf32bfinfd.c \
 	eelf32cr16.c \
@@ -715,6 +716,7 @@ $(ALL_EMULATION_SOURCES) $(ALL_64_EMULATION_SOURCES): $(GEN_DEPENDS)
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32_tic6x_linux_be.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32_tic6x_linux_le.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32am33lin.Pc@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32athena.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32bfin.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32bfinfd.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32cr16.Pc@am__quote@
diff --git a/ld/Makefile.in b/ld/Makefile.in
index ee0c98f65b0..34e4764f3fe 100644
--- a/ld/Makefile.in
+++ b/ld/Makefile.in
@@ -721,6 +721,7 @@ ALL_EMULATION_SOURCES = \
 	eelf32_tic6x_linux_be.c \
 	eelf32_tic6x_linux_le.c \
 	eelf32am33lin.c \
+	eelf32athena.c \
 	eelf32bfin.c \
 	eelf32bfinfd.c \
 	eelf32cr16.c \
@@ -2529,6 +2530,7 @@ $(ALL_EMULATION_SOURCES) $(ALL_64_EMULATION_SOURCES): $(GEN_DEPENDS)
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ez8001.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ez8002.Pc@am__quote@
 
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eelf32athena.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eaarch64cloudabi.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eaarch64cloudabib.Pc@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/eaarch64elf.Pc@am__quote@
diff --git a/ld/configure.tgt b/ld/configure.tgt
index 2bae9099b6a..fe94b4fe21f 100644
--- a/ld/configure.tgt
+++ b/ld/configure.tgt
@@ -242,6 +242,8 @@ arm*-*-fuchsia*)	targ_emul=armelf_fuchsia
 arm*-*-haiku*)		targ_emul=armelf_haiku
 			targ_extra_emuls=armelf
 			;;
+athena-*-*)		targ_emul=elf32athena
+			;;
 avr-*-*)		targ_emul=avr2
 			targ_extra_emuls="avr1 avr25 avr3 avr31 avr35 avr4 avr5 avr51 avr6 avrxmega1 avrxmega2 avrxmega3 avrxmega4 avrxmega5 avrxmega6 avrxmega7 avrtiny"
 			;;
diff --git a/ld/emulparams/elf32athena.sh b/ld/emulparams/elf32athena.sh
new file mode 100644
index 00000000000..54a6b41e1f3
--- /dev/null
+++ b/ld/emulparams/elf32athena.sh
@@ -0,0 +1,10 @@
+ARCH=athena
+MACHINE=
+SCRIPT_NAME=elf
+OUTPUT_FORMAT="elf32-athena"
+MAXPAGESIZE=0x1000
+EMBEDDED=yes
+TEMPLATE_NAME=elf
+TEXT_START_ADDR=0x0000
+DYNAMIC_LINK=false
+ALIGNMENT=4
diff --git a/opcodes/athena-dis.c b/opcodes/athena-dis.c
new file mode 100644
index 00000000000..8f414f586f2
--- /dev/null
+++ b/opcodes/athena-dis.c
@@ -0,0 +1 @@
+/* TODO */
diff --git a/opcodes/athena-opc.c b/opcodes/athena-opc.c
new file mode 100644
index 00000000000..8f414f586f2
--- /dev/null
+++ b/opcodes/athena-opc.c
@@ -0,0 +1 @@
+/* TODO */
diff --git a/opcodes/configure b/opcodes/configure
index a5951b9b362..7796ec9c40b 100755
--- a/opcodes/configure
+++ b/opcodes/configure
@@ -12500,6 +12500,7 @@ if test x${all_targets} = xfalse ; then
 	bfd_amdgcn_arch)	;;
 	bfd_arc_arch)		ta="$ta arc-dis.lo arc-opc.lo arc-ext.lo" ;;
 	bfd_arm_arch)		ta="$ta arm-dis.lo" ;;
+	bfd_athena_arch)        ta="$ta athena-dis.lo athena-opc.lo" ;;
 	bfd_avr_arch)		ta="$ta avr-dis.lo" ;;
 	bfd_bfin_arch)		ta="$ta bfin-dis.lo" ;;
 	bfd_cr16_arch)		ta="$ta cr16-dis.lo cr16-opc.lo" ;;