问为什么STM32CubeIDE在调试时不显示SFR寄存器？

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CC = arm-none-eabi-gcc -c
LD = arm-none-eabi-gcc

LIBNAME_OPENCM3 = opencm3_stm32f1

OPT = -Os
DEFS += -DSTM32F1
DIR_OPENCM3 = ./libopencm3
DIR_INC = ./inc
DIR_OBJ = ./obj
DEBUG = -ggdb3
LDSCRIPT = stm32f1.ld

DIR_FLAGS = -I$(DIR_INC)

ARCH_FLAGS = -mthumb -mcpu=cortex-m3

LDFLAGS += --static -nostartfiles
LDFLAGS += -T$(LDSCRIPT)
LDFLAGS += $(ARCH_FLAGS) $(DEBUG)
LDFLAGS += -Wl,-Map=$(*).map -Wl,--cref
LDFLAGS += -Wl,--gc-sections
ifeq ($(V),99)
LDFLAGS     += -Wl,--print-gc-sections
endif
LDFLAGS += -u _printf_float
LDFLAGS += -L$(DIR_OPENCM3)/lib

LDLIBS += -l$(LIBNAME_OPENCM3)
LDLIBS += -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group

CFLAGS += $(OPT) $(DEBUG) $(ARCH_FLAGS)
CFLAGS += -Wextra -Wshadow -Wimplicit-function-declaration
CFLAGS += -Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes
CFLAGS += -fno-common -ffunction-sections -fdata-sections
CFLAGS += -std=c11

DEFS += -I$(DIR_OPENCM3)/include

PREPFLAGS = -MD -Wall -Wundef $(DEFS)

OBJS = $(DIR_OBJ)/main.o \
        $(DIR_OBJ)/bmp180.o

main.elf : $(OBJS) $(LDSCRIPT)
    $(LD) $(LDFLAGS) $(OBJS) $(LDLIBS) -o main.elf
$(DIR_OBJ)/%.o : %.c
    mkdir -p $(DIR_OBJ)
    $(CC) $(CFLAGS) $(DIR_FLAGS) $(PREPFLAGS) $< -o $@
clean :
    rm -rf $(DIR_OBJ) *.elf *.map *.d
all :
    make