arcv: Update expect scripts of dejagnu to define compiler and nSIM AR…

…C-V options

README.md

@@ -315,7 +315,9 @@ Prefixes which start with `arc-` correspond to little endian toolchains. Prefixe
 ### Using nSIM simulator to run bare metal ARC applications
 
 nSIM simulator supports GNU IO hostlink used by the libc library of bare metal
-GNU toolchain for ARC. nSIM option `nsim_emt=1` enables GNU IO hostlink.
+GNU toolchain for ARC. nSIM option `nsim_emt=1` enables GNU IO hostlink. nSIM
+simulator also supports semihosting, which is essential for ARC-V targets, more
+details can be found in nSIM documentation.
 
 To start nSIM in gdbserver mode for ARC EM6:
 

dejagnu/arc-common.exp

@@ -52,11 +52,16 @@ proc arc_get_cflags {} {
     if { ![info exists env(ARC_HOSTLINK_LIBRARY)] } {
 	if [board_info $board exists arc,hostlink] {
 	    if { [board_info $board arc,hostlink] == "nsim" } {
-		lappend cflags --specs=nsim.specs
+		    lappend cflags --specs=nsim.specs
 	    } elseif { [board_info $board arc,hostlink] == "metaware" } {
-		lappend cflags --specs=hl.specs
+    		lappend cflags --specs=hl.specs
+	    } elseif { [board_info $board arc,hostlink] == "semihost" } {
+            lappend cflags --specs=semihost.specs \
+            --specs=arcv.specs -mabi=ilp32 \
+            -march=rv32im_zba_zbb_zbs_zca_zcb_zcmp_zicsr \
+            -T arcv.ld
 	    } else {
-		lappend cflags --specs=nosys.specs
+		    lappend cflags --specs=nosys.specs
 	    }
 	} else {
 	    lappend cflags --specs=nosys.specs

dejagnu/baseboards/arc-nsim.exp

@@ -100,25 +100,27 @@ if { $tool == "libstdc++" } {
 }
 
 # Check if nsim_download_elf_sections option is required - whether nSIM version
-# is > 2015.06. If revision.txt doesn't exist - this is a private verification
-# build of nSIM, so assume that this is the latest version.
+# is > 2015.06 and a target is not ARC-V. If revision.txt doesn't exist - this 
+# is a private verification build of nSIM, so assume that this is the latest
+# version.
 set nsim_version_path "$::env(NSIM_HOME)/revision.txt"
-if [file exists $nsim_version_path] {
-    set nsim_version_fid [open $nsim_version_path r]
-    set nsim_version_text [read $nsim_version_fid]
-    close $nsim_version_fid
-    regexp "Version\\s+: (\\d+)\.(\\d+)" $nsim_version_text -> \
-	nsim_version_year nsim_version_month
-    if { $nsim_version_year > 2015 || \
-	($nsim_version_year == 2015 && $nsim_version_month > 6) } {
-	# Avoid performance penalty of useless initialization of heap and stack
-	# sections.
-	lappend nsim_flags "-on nsim_download_elf_sections"
-    }
-} else {
-    lappend nsim_flags "-on nsim_download_elf_sections"
+if { ![check_target_arcv] } {
+	if [file exists $nsim_version_path] {
+		set nsim_version_fid [open $nsim_version_path r]
+		set nsim_version_text [read $nsim_version_fid]
+		close $nsim_version_fid
+		regexp "Version\\s+: (\\d+)\.(\\d+)" $nsim_version_text -> \
+		nsim_version_year nsim_version_month
+		if { $nsim_version_year > 2015 || \
+		($nsim_version_year == 2015 && $nsim_version_month > 6) } {
+		# Avoid performance penalty of useless initialization of heap and stack
+		# sections.
+		lappend nsim_flags "-on nsim_download_elf_sections"
+		}
+	} else {
+		lappend nsim_flags "-on nsim_download_elf_sections"
+	}
 }
-
 set_board_info nsim_flags [join $nsim_flags]
 
 # nSIM is an exclusive resource -- only one client can connect at a time.

dejagnu/baseboards/arc-sim-nsimdrv.exp

@@ -80,23 +80,26 @@ if { $tool == "libstdc++" } {
 }
 
 # Check if nsim_download_elf_sections option is required - whether nSIM version
-# is > 2015.06. If revision.txt doesn't exist - this is a private verification
-# build of nSIM, so assume that this is the latest version.
+# is > 2015.06 and a target is not ARC-V. If revision.txt doesn't exist - this 
+# is a private verification build of nSIM, so assume that this is the latest
+# version.
 set nsim_version_path "$::env(NSIM_HOME)/revision.txt"
-if [file exists $nsim_version_path] {
-    set nsim_version_fid [open $nsim_version_path r]
-    set nsim_version_text [read $nsim_version_fid]
-    close $nsim_version_fid
-    regexp "Version\\s+: (\\d+)\.(\\d+)" $nsim_version_text -> \
-	nsim_version_year nsim_version_month
-    if { $nsim_version_year > 2015 || \
-	($nsim_version_year == 2015 && $nsim_version_month > 6) } {
-	# Avoid performance penalty of useless initialization of heap and stack
-	# sections.
-	lappend nsim_flags "-on nsim_download_elf_sections"
-    }
-} else {
-    lappend nsim_flags "-on nsim_download_elf_sections"
+if { ![check_target_arcv] } {
+	if [file exists $nsim_version_path] {
+		set nsim_version_fid [open $nsim_version_path r]
+		set nsim_version_text [read $nsim_version_fid]
+		close $nsim_version_fid
+		regexp "Version\\s+: (\\d+)\.(\\d+)" $nsim_version_text -> \
+		nsim_version_year nsim_version_month
+		if { $nsim_version_year > 2015 || \
+		($nsim_version_year == 2015 && $nsim_version_month > 6) } {
+		# Avoid performance penalty of useless initialization of heap and stack
+		# sections.
+		lappend nsim_flags "-on nsim_download_elf_sections"
+		}
+	} else {
+		lappend nsim_flags "-on nsim_download_elf_sections"
+	}
 }
 
 # Hostlink library support
@@ -105,14 +108,14 @@ if { [info exists env(ARC_HOSTLINK_LIBRARY)] } {
         -Wl,--no-whole-archive"
 } elseif { [info exists env(ARC_NSIM_HOSTLINK)] } {
     set_board_info arc,hostlink $env(ARC_NSIM_HOSTLINK)
-
     if { [board_info $board arc,hostlink] != "metaware" && \
-	 [board_info $board arc,hostlink] != "nsim" } {
+	 [board_info $board arc,hostlink] != "nsim" && \
+	 [board_info $board arc,hostlink] != "semihost" } {
         perror "Unknown nSIM HOSTLINK type $env(ARC_NSIM_HOSTLINK)"
         exit 1
     }
 } else {
-    # Use nSIM GNU IO hostlink by default
+    verbose "Use nSIM GNU IO hostlink by default"
     set_board_info arc,hostlink "nsim"
 }
 
@@ -210,6 +213,12 @@ if { [check_target_arc64_64] } {
 	-p nsim_isa_family=av2em \
 	-p nsim_isa_core=3 \
 	-on nsim_isa_sat
+} elseif { [check_target_arcv] } {
+	lappend nsim_flags \
+	-p nsim_isa_family=rv32 \
+	-p nsim_isa_ext=-all.i.zicsr.zifencei.zihintpause.b.zca.zcb.zcmp.zcmt.a.m.zbb \
+	-p nsim_semihosting=1 \
+	-off=enable_exceptions
 } else {
     perror "Unknown CPU configuration"
 }

dejagnu/tool-extra.exp

@@ -86,6 +86,11 @@ proc compile_quarkse_em_nsim_apex { } {
     }
 }
 
+# Return 1 if we compile for ARC-V
+proc check_target_arcv { } {
+    return [check_target_arc "__riscv"]
+}
+
 # Return 1 if we compile for ARC64
 proc check_target_arc64_64 { } {
     return [check_target_arc "__ARC64_ARCH64__"]