Merge branch 'riscv64-noop-mainargs' into 'master'

riscv64-noop,trm: support mainargs

See merge request projectn/nexus-am!32

am/arch/riscv64-noop.mk

 include $(AM_HOME)/am/arch/isa/riscv64.mk
 
 AM_SRCS := noop/isa/riscv/trm.c \
+           nemu/common/mainargs.S \
            noop/isa/riscv/perf.c \
            noop/common/uartlite.c \
            nemu/isa/riscv/cte.c \
@@ -18,6 +19,9 @@ AM_SRCS := noop/isa/riscv/trm.c \
 
 CFLAGS  += -I$(AM_HOME)/am/src/nemu/include -DISA_H=\"riscv.h\"
 
+ASFLAGS += -DMAINARGS=\"$(mainargs)\"
+.PHONY: $(AM_HOME)/am/src/nemu/common/mainargs.S
+
 LDFLAGS += -L $(AM_HOME)/am/src/nemu/ldscript
 LDFLAGS += -T $(AM_HOME)/am/src/nemu/isa/riscv/boot/loader64.ld
 

am/src/noop/isa/riscv/trm.c

@@ -29,7 +29,7 @@ void _halt(int code) {
 
 void _trm_init() {
   __am_init_uartlite();
-  const char *mainargs = "";
-  int ret = main(mainargs);
+  extern const char __am_mainargs;
+  int ret = main(&__am_mainargs);
   _halt(ret);
 }