add riscv32e-npc

scripts/platform/npc.mk

@@ -1,5 +1,3 @@
-include $(AM_HOME)/scripts/isa/riscv.mk
-
 AM_SRCS := riscv/npc/start.S \
            riscv/npc/trm.c \
            riscv/npc/ioe.c \
@@ -11,7 +9,8 @@ AM_SRCS := riscv/npc/start.S \
            platform/dummy/mpe.c
 
 CFLAGS    += -fdata-sections -ffunction-sections
-LDFLAGS   += -T $(AM_HOME)/scripts/linker.ld --defsym=_pmem_start=0x80000000 --defsym=_entry_offset=0x0
+LDFLAGS   += -T $(AM_HOME)/scripts/linker.ld \
+						 --defsym=_pmem_start=0x80000000 --defsym=_entry_offset=0x0
 LDFLAGS   += --gc-sections -e _start
 CFLAGS += -DMAINARGS=\"$(mainargs)\"
 .PHONY: $(AM_HOME)/am/src/riscv/npc/trm.c

scripts/riscv32e-nemu.mk

@@ -0,0 +1,10 @@
+include $(AM_HOME)/scripts/isa/riscv.mk
+include $(AM_HOME)/scripts/platform/nemu.mk
+CFLAGS  += -DISA_H=\"riscv/riscv.h\"
+COMMON_CFLAGS += -march=rv32em_zicsr -mabi=ilp32e  # overwrite
+LDFLAGS       += -melf32lriscv                     # overwrite
+
+AM_SRCS += riscv/nemu/start.S \
+           riscv/nemu/cte.c \
+           riscv/nemu/trap.S \
+           riscv/nemu/vme.c

scripts/riscv32e-npc.mk

@@ -0,0 +1,4 @@
+include $(AM_HOME)/scripts/isa/riscv.mk
+include $(AM_HOME)/scripts/platform/npc.mk
+COMMON_CFLAGS += -march=rv32e_zicsr -mabi=ilp32e  # overwrite
+LDFLAGS       += -melf32lriscv                    # overwrite