arc64: Add initial support of Synopsys ARCv3 targets

Synopsys ARCv3 architecture includes 32-bit ARC HS5x cores and
64-bit ARC HS6x cores.

Note that libgloss for ARCv3 shares the same code base as
for ARCv1/2 targets. Thus, Makefile.inc for libgloss uses
sources from libgloss/arc directory except crtX.S files.

Co-authored-by: Shahab Vahedi <shahab@synopsys.com>
Co-authored-by: Claudiu Zissulescu <claziss@gmail.com>
Co-authored-by: Bruno Mauricio <brunoasmauricio@gmail.com>
Co-authored-by: Luis Silva <luis.m.silva99@hotmail.com>
Signed-off-by: Yuriy Kolerov <kolerov93@gmail.com>

config.guess

@@ -2,7 +2,7 @@
 # Attempt to guess a canonical system name.
 #   Copyright 1992-2021 Free Software Foundation, Inc.
 
-timestamp='2021-01-25'
+timestamp='2024-05-24'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -949,7 +949,7 @@ EOF
 	if test "$?" = 0 ; then LIBC=gnulibc1 ; fi
 	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
 	exit ;;
-    arc:Linux:*:* | arceb:Linux:*:*)
+    arc:Linux:*:* | arceb:Linux:*:* | arc64:Linux:*:*)
 	echo "$UNAME_MACHINE"-unknown-linux-"$LIBC"
 	exit ;;
     arm*:Linux:*:*)

config.sub

@@ -2,7 +2,7 @@
 # Configuration validation subroutine script.
 #   Copyright 1992-2021 Free Software Foundation, Inc.
 
-timestamp='2021-01-08'
+timestamp='2024-05-24'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -1165,7 +1165,7 @@ case $cpu-$vendor in
 			| alphapca5[67] | alpha64pca5[67] \
 			| am33_2.0 \
 			| amdgcn \
-			| arc | arceb \
+			| arc | arceb | arc64 | arc32 \
 			| arm | arm[lb]e | arme[lb] | armv* \
 			| avr | avr32 \
 			| asmjs \

libgloss/Makefile.am

@@ -86,6 +86,9 @@ endif
 if CONFIG_ARC
 include arc/Makefile.inc
 endif
+if CONFIG_ARC64
+include arc64/Makefile.inc
+endif
 if CONFIG_ARM
 include arm/Makefile.inc
 endif

libgloss/arc64/Makefile.inc

@@ -0,0 +1,44 @@
+multilibtool_LIBRARIES += %D%/libnsim.a
+%C%_libnsim_a_CPPFLAGS = -I$(srcdir)/arc
+%C%_libnsim_a_SOURCES = \
+	arc/libcfunc.c \
+	arc/nsim-syscalls.c \
+	arc/sbrk.c
+
+multilibtool_LIBRARIES += %D%/libhl.a
+%C%_libhl_a_CFLAGS = -mvolatile-di
+%C%_libhl_a_CPPFLAGS = -I$(srcdir)/arc
+%C%_libhl_a_SOURCES = \
+	arc/arc-timer.c \
+	arc/hl-stub.c \
+	arc/hl-setup.c \
+	arc/libcfunc.c \
+	arc/sbrk.c \
+	arc/hl/hl_gw.c \
+	arc/hl/hl_api.c \
+	arc/hl/hl_open.c \
+	arc/hl/hl_close.c \
+	arc/hl/hl_read.c \
+	arc/hl/hl_write.c \
+	arc/hl/hl_lseek.c \
+	arc/hl/hl_unlink.c \
+	arc/hl/hl_isatty.c \
+	arc/hl/hl_clock.c \
+	arc/hl/hl_gettimeofday.c \
+	arc/hl/hl_argc.c \
+	arc/hl/hl_argv.c \
+	arc/hl/hl_exit.c
+
+multilibtool_DATA += \
+	%D%/crt0.o \
+	%D%/crtn.o \
+	%D%/crti.o \
+	arc/arc-main-helper.o \
+	arc/nsim.specs \
+	arc/hl.specs
+
+libobjs_a_SOURCES += \
+	%D%/crt0.S \
+	%D%/crtn.S \
+	%D%/crti.S \
+	arc/arc-main-helper.c

libgloss/arc64/asm.h

@@ -0,0 +1,123 @@
+/*
+   Copyright (c) 2024, Synopsys, Inc. All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions are met:
+
+   1) Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+
+   2) Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+   3) Neither the name of the Synopsys, Inc., nor the names of its contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+   POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef _ARC64_ASM_H
+#define _ARC64_ASM_H
+
+#if defined (__ARC64_ARCH32__)
+
+/* Define 32-bit word.  */
+.macro WORD w
+  .word \w
+.endm
+
+/* Move register immediate (short): r:reg, i:immediate  */
+.macro MOVRI_S r, i
+  mov_s	  \r, \i
+.endm
+
+/* Move register immediate (short): r:reg, ri:reg/immediate  */
+.macro MOVR_S r, ri
+  mov_s	  \r, \ri
+.endm
+
+/* Move register immediate: r:reg, ri:reg/immediate  */
+.macro MOVR r, ri
+  mov	  \r, \ri
+.endm
+
+/* Push register: r:reg  */
+.macro PUSHR   r
+  push  \r
+.endm
+
+/* Pop register: r:reg  */
+.macro POPR r
+  pop	  \r
+.endm
+
+/* Subtract register: r1(reg), r2(reg), r3(reg)  */
+.macro SUBR r1, r2, r3
+  sub	  \r1, \r2, \r3
+.endm
+
+/* Add PCL-rel: r:reg, symb: symbol */
+.macro ADDPCL r,symb
+  add	  \r, pcl, \symb
+.endm
+
+#elif defined (__ARC64_ARCH64__)
+
+/* Define 64-bit word.  */
+.macro WORD w
+  .xword \w
+.endm
+
+/* Move immediate (short): r:reg, i:immediate  */
+.macro MOVRI_S r, i
+  movhl_s \r, \i
+  orl_s	  \r, \r, \i
+.endm
+
+/* Move register immediate (short): r:reg, ri:reg/immediate  */
+.macro MOVR_S r, ri
+  movl_s  \r, \ri
+.endm
+
+/* Move register immediate: r:reg, ri:reg/immediate  */
+.macro MOVR r, ri
+  movl	  \r, \ri
+.endm
+
+/* Push register: r:reg  */
+.macro PUSHR   r
+  pushl_s \r
+.endm
+
+/* Pop register: r:reg  */
+.macro POPR   r
+  popl_s  \r
+.endm
+
+/* Subtract register: r1(reg), r2(reg), r3(reg)  */
+.macro SUBR r1, r2, r3
+  subl	  \r1, \r2, \r3
+.endm
+
+/* Add PCL-rel: r:reg, symb: symbol */
+.macro ADDPCL r, symb
+  addl	  \r, pcl, \symb@pcl
+.endm
+
+#else /* !__ARC64_ARC32__  && !__ARC64_ARC64__  */
+# error Please use either 32-bit or 64-bit version of arc64 compiler
+#endif
+
+#endif /* _ARC64_ASM_H  */

libgloss/arc64/crt0.S

@@ -0,0 +1,160 @@
+/*
+   Copyright (c) 2024, Synopsys, Inc. All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions are met:
+
+   1) Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+
+   2) Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+   3) Neither the name of the Synopsys, Inc., nor the names of its contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+   POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/*
+   The startup code for the ARC family of processors does the following before
+   transferring control to user defined main label:
+       1.  Set sp to __stack_top (link time variable)
+       2.  Zero out the bss section (for uninitialized globals)
+   After returning from main, the processor is halted and the pipeline is
+   flushed out.
+*/
+
+#include "asm.h"
+#include "../arc/arc-symbols.h"
+
+	.macro initfp from=0, to=31
+	fmvi2s	f0+\from,r0
+	.if	\to-\from
+	initfp	"(\from+1)",\to
+	.endif
+	.endm
+
+	.extern main
+
+	.section .text.__startup, "ax", @progbits
+	.global	__start
+	.type	__start, @function
+	.align 4
+__start:
+	MOVRI_S	sp, STACK_TOP	; Stack address
+
+	; Allow unaligned accesses.
+	lr      r2, [0xA]
+	bset    r2, r2, 19
+	flag    r2
+
+;;;  Clear the bss segment.
+	MOVRI_S	r0, SMALL_DATA_BSS_START	; r0 = start of the bss section
+	MOVRI_S	r2, SMALL_DATA_BSS_END
+	SUBR	r2, r2, r0		; r2 = size of the bss section in bytes
+	MOVR_S	r1, 0			; r1 = bytes to fill in
+	bl	memset
+
+;;; Clear the registers.
+	MOVR_S	r0, 0
+	MOVR_S	r1, 0
+	MOVR_S	r2, 0
+	MOVR_S	r3, 0
+	MOVR_S	r4, 0
+	MOVR_S	r5, 0
+	MOVR_S	r6, 0
+	MOVR_S	r7, 0
+	MOVR_S	r8, 0
+	MOVR_S	r9, 0
+	MOVR_S	r10, 0
+	MOVR_S	r11, 0
+	MOVR_S	r12, 0
+	MOVR_S	r13, 0
+	MOVR_S	r14, 0
+	MOVR_S	r15, 0
+	MOVR_S	r16, 0
+	MOVR_S	r17, 0
+	MOVR_S	r18, 0
+	MOVR_S	r19, 0
+	MOVR_S	r20, 0
+	MOVR_S	r21, 0
+	MOVR_S	r22, 0
+	MOVR_S	r23, 0
+	MOVR_S	r24, 0
+	MOVR_S	r25, 0
+	MOVR_S	r26, 0
+	MOVR_S	r27, 0
+	;; SP (r28) is initialized
+	MOVR_S	ilink, 0
+	MOVR	r30, 0
+
+#if defined(__ARC_FPU_DP__) || defined (__ARC_FPU_SP__)
+	initfp	0,31
+#endif
+
+	;; Call constructors.
+	jl	_init
+
+;;; Setup fini routines to be called from exit
+	MOVRI_S	r0, _fini
+	jl	atexit
+
+	jl	__setup_argv_and_call_main
+
+	j	exit
+	.size	__start, .-__start
+
+;;; arc-main-helper.o object can be used to replace this function
+;;; and properly set up arguments and/or other low-level stuff.
+	.section .text.__setup_argv_and_call_main,"ax",@progbits
+	.weak	__setup_argv_and_call_main
+	.type	__setup_argv_and_call_main, @function
+	.align 4
+
+__setup_argv_and_call_main:
+	PUSHR	blink
+;;; Call main() with argv[0] set to "baremetal", argv[1] to NULL and empty envp
+	MOVR_S	r0, 1		; Set argc to 1
+	ADDPCL	r1,.argv_data	; Set argv to the appropriate pointer
+	MOVR_S	r2, 0
+	MOVR_S	r3, 0
+
+	MOVRI_S	blink, main
+	jl	[blink]
+
+	POPR	blink
+	j_s	[blink]
+
+	.align 4
+	;; Dummy program name
+.prog_name:
+	.string		"baremetal"
+;; argv data
+.argv_data:
+	 WORD		@.prog_name
+	 WORD		0x00
+	.size	__setup_argv_and_call_main, .-__setup_argv_and_call_main
+
+	.section .text._exit_halt,"ax",@progbits
+	.global	 _exit_halt
+	.type	 _exit_halt, @function
+	.align 4
+_exit_halt:
+	; r0 contains exit code
+	mov	r0, r0
+	flag	1
+	b	_exit_halt
+	.size	_exit_halt, .-_exit_halt