[ARC] [libgloss] Introduce hostlink interface

There is a special interface built in ARC simulators
(such as NSIM) called Metaware hostlink IO which can be used
to implement system calls.

This commit adds support for this interface to the ARC port of libgloss.

Author: Vladimir Isaev

libgloss/arc/Makefile.in

@@ -43,6 +43,7 @@ LD = @LD@
 RANLIB = @RANLIB@
 
 UART_CFLAGS = @UART_CFLAGS@
+HL_CFLAGS = @HL_CFLAGS@
 
 OBJDUMP = `if [ -f ${objroot}/../binutils/objdump ] ; \
 	then echo ${objroot}/../binutils/objdump ; \
@@ -51,7 +52,7 @@ OBJCOPY = `if [ -f ${objroot}/../binutils/objcopy ] ; \
 	then echo ${objroot}/../binutils/objcopy ; \
 	else t='$(program_transform_name)'; echo objcopy | sed -e $$t ; fi`
 
-CRT0		= gcrt0.o crt0.o
+CRT0		= gcrt0.o crt0.o semihost-helper.o
 CRT0_INSTALL	= install-crt0
 
 NSIM_BSP = libnsim.a
@@ -60,6 +61,7 @@ NSIM_OBJS = \
 	nsim-syscalls.o \
 	sbrk.o \
 	mcount.o
+
 NSIM_INSTALL = install-nsim
 NSIM_SCRIPTS = nsim.specs
 
@@ -74,6 +76,32 @@ QEMU_OBJS = \
 QEMU_INSTALL = install-qemu
 QEMU_SCRIPTS = qemu.specs
 
+HL_BSP = libhl.a
+HL_OBJS = \
+	hl-stub.o \
+	libcfunc.o \
+	sbrk.o \
+	mcount.o
+HL_DIR_OBJS = \
+	hl/hl_gw.o \
+	hl/hl_api.o \
+	hl/hl_open.o \
+	hl/hl_close.o \
+	hl/hl_read.o \
+	hl/hl_write.o \
+	hl/hl_lseek.o \
+	hl/hl_unlink.o \
+	hl/hl_isatty.o \
+	hl/hl_fstat.o \
+	hl/hl_clock.o \
+	hl/hl_gettimeofday.o \
+	hl/hl_argc.o \
+	hl/hl_argv.o \
+	hl/hl_exit.o
+
+HL_INSTALL = install-hl
+HL_SCRIPTS = hl.specs
+
 UART_LIB = libdw_uart.a
 UART_OBJS = write.o \
 	    read.o \
@@ -88,17 +116,18 @@ MEMORY_MAPS = emsk_em9d.x \
 MEMORY_MAP_INSTALL = install-map
 
 UART_DIR = uart-dir
+HL_DIR = hl-dir
 
 CFLAGS = -g
-override CFLAGS += $(UART_CFLAGS)
+override CFLAGS += $(UART_CFLAGS) $(HL_CFLAGS)
 
 CPU_FAMILY = $(findstring em,${MULTISUBDIR})
 ifeq ($(CPU_FAMILY), em)
-ALL = $(CRT0) $(NSIM_BSP) $(UART_LIB) $(QEMU_BSP)
+ALL = $(CRT0) $(NSIM_BSP) $(UART_LIB) $(QEMU_BSP) $(HL_BSP)
 else
-ALL = $(CRT0) $(NSIM_BSP) $(QEMU_BSP)
+ALL = $(CRT0) $(NSIM_BSP) $(QEMU_BSP) $(HL_BSP)
 endif
-ALL_INSTALL = $(CRT0_INSTALL) $(NSIM_INSTALL) $(NANO_INSTALL) $(UART_INSTALL) $(MEMORY_MAP_INSTALL) $(QEMU_INSTALL)
+ALL_INSTALL = $(CRT0_INSTALL) $(NSIM_INSTALL) $(NANO_INSTALL) $(UART_INSTALL) $(MEMORY_MAP_INSTALL) $(QEMU_INSTALL) $(HL_INSTALL)
 
 # These are roughly topologically sorted in order to make porting more
 # streamlined.
@@ -132,15 +161,18 @@ FLAGS_TO_PASS = \
 all: $(ALL)
 
 $(NSIM_BSP): $(NSIM_OBJS)
-	$(AR) $(ARFLAGS) $@ $?
+	$(AR) $(ARFLAGS) $@ $(NSIM_OBJS)
 	$(RANLIB) $@
 
 $(UART_LIB): $(UART_OBJS) $(UART_DIR)
 	$(AR) $(ARFLAGS) $@ $(UART_OBJS) dw_uart/*.o
 	$(RANLIB) $@
 
+$(HL_DIR): hl
 $(UART_DIR): dw_uart
-	for dir in .. ${SUBDIRS}; do \
+
+$(HL_DIR) $(UART_DIR):
+	for dir in .. $^; do \
 	  if [ x$$dir != x.. ]; then \
 	    if [ -d $$dir ]; then \
 	      (cd $$dir; $(MAKE) $(FLAGS_TO_PASS) all) || exit $$?; \
@@ -152,6 +184,13 @@ $(QEMU_BSP): $(QEMU_OBJS)
 	$(AR) $(ARFLAGS) $@ $?
 	$(RANLIB) $@
 
+$(HL_DIR_OBJS): $(HL_DIR)
+	true
+
+$(HL_BSP): $(HL_OBJS) $(HL_DIR_OBJS)
+	$(AR) $(ARFLAGS) $@ $?
+	$(RANLIB) $@
+
 libcfunc.o: libcfunc.c
 nsim-syscalls.o: nsim-syscalls.c
 sbrk.o: sbrk.c
@@ -163,6 +202,9 @@ qemu-write.o: qemu-write.c
 read.o: read.c
 stub.o: stub.c
 qemu-stub.o: qemu-stub.c
+hl-stub.o: hl-stub.c
+semihost-helper.o: semihost-helper.c
+
 $(UART_OBJS):
 	$(CC) $(CFLAGS_FOR_TARGET) $(INCLUDES) -c $(CFLAGS) $<
 
@@ -211,6 +253,11 @@ $(QEMU_INSTALL):
 	for x in $(QEMU_SCRIPTS); do \
 	    $(INSTALL_DATA) $(srcdir)/$$x $(DESTDIR)$(tooldir)/lib$(MULTISUBDIR)/$$x; done
 
+$(HL_INSTALL):
+	$(mkinstalldirs) $(DESTDIR)${tooldir}/lib${MULTISUBDIR}
+	$(INSTALL_DATA) $(HL_BSP) $(DESTDIR)$(tooldir)/lib$(MULTISUBDIR)/$(HL_BSP)
+	for x in $(HL_SCRIPTS); do \
+	    $(INSTALL_DATA) $(srcdir)/$$x $(DESTDIR)$(tooldir)/lib$(MULTISUBDIR)/$$x; done
 
 $(MEMORY_MAP_INSTALL):
 	$(mkinstalldirs) $(DESTDIR)${tooldir}/lib${MULTISUBDIR}