switch loongarch64 toolchain from hard-float to soft-float

Makefile

@@ -110,7 +110,7 @@ else ifeq ($(ARCH), aarch64)
 else ifeq ($(ARCH), loongarch64)
   ACCEL ?= n
   PLATFORM_NAME ?= loongarch64-qemu-virt
-  TARGET := loongarch64-unknown-none
+  TARGET := loongarch64-unknown-none-softfloat
   BUS := pci
 else
   $(error "ARCH" must be one of "x86_64", "riscv64", "aarch64" or "loongarch64")
@@ -134,8 +134,8 @@ export AX_GW=$(GW)
 # Binutils
 CROSS_COMPILE ?= $(ARCH)-linux-musl-
 ifeq ($(ARCH), loongarch64)
-	CROSS_COMPILE := $(ARCH)-unknown-linux-gnu-
-  # CROSS_COMPILE := $(ARCH)-linux-gnu-
+	CROSS_COMPILE := $(ARCH)-linux-gnu-
+  # CROSS_COMPILE := $(ARCH)-unknown-linux-gnu-
 endif
 CC := $(CROSS_COMPILE)gcc
 AR := $(CROSS_COMPILE)ar
@@ -188,8 +188,8 @@ debug: build
 	sleep 1
 	$(GDB) $(OUT_ELF) \
 	  -ex 'target remote localhost:1234' \
-	  -ex 'b *0x9000000000001000' \
-    -ex 'b *0x1000' \
+	  -ex 'b rust_entry' \
+    -ex 'continue' \
 	  -ex 'disp /16i $$pc'
 
 clippy:

rust-toolchain.toml

@@ -2,4 +2,4 @@
 profile = "minimal"
 channel = "nightly"
 components = ["rust-src", "llvm-tools-preview", "rustfmt", "clippy"]
-targets = ["x86_64-unknown-none", "riscv64gc-unknown-none-elf", "aarch64-unknown-none-softfloat","loongarch64-unknown-none"]
+targets = ["x86_64-unknown-none", "riscv64gc-unknown-none-elf", "aarch64-unknown-none-softfloat","loongarch64-unknown-none-softfloat"]

scripts/make/build.mk

@@ -25,6 +25,8 @@ else ifeq ($(filter $(MAKECMDGOALS),clippy unittest unittest_no_fail_fast),) # n
   endif
   ifeq ($(APP_TYPE), c)
     $(if $(V), $(info CFLAGS: "$(CFLAGS)") $(info LDFLAGS: "$(LDFLAGS)"))
+    $(if $(V), $(info RUSTFLAGS: "$(RUSTFLAGS)"))
+    export RUSTFLAGS
   else
     $(if $(V), $(info RUSTFLAGS: "$(RUSTFLAGS)"))
     export RUSTFLAGS

scripts/make/build_c.mk

@@ -29,6 +29,8 @@ ifeq ($(ARCH), x86_64)
   LDFLAGS += --no-relax
 else ifeq ($(ARCH), riscv64)
   CFLAGS += -march=rv64gc -mabi=lp64d -mcmodel=medany
+else ifeq ($(ARCH), loongarch64)
+  CFLAGS += -mstrict-align -msoft-float -mno-relax
 endif
 
 ifeq ($(findstring fp_simd,$(FEATURES)),)