可以在Cortex A55上运行简单的printf

发布于 2025-01-31 23:55:56 字数 2369 浏览 2 评论 0 原文

我正在尝试使用RK3568控制器（Cortex A55）我有一个项目和一个makefile 我设法使用寄存器输出角色并刷新LED。但是，如果我尝试使用printf输出一个字符串，则该程序就不会冻结没有任何生命迹象。我正在寻找解决该问题的解决方案，主要解决方案是实现 _WRITE函数（int文件，char *ptr，int len），标准printf函数应使用。但这无济于事。我试图连接GitHub的另一个printf函数，并且它起作用。我不明白原因是什么。我尝试从标准库中调用其他功能，例如 strlen ，它的行为与 printf

int _write(int file, char *ptr, int len)
{
    __io_putchar('w');
    int DataIdx;

    for (DataIdx = 0; DataIdx < len; DataIdx++)
    {
        __io_putchar( *ptr++ );
    }
    return len;
}

我正在使用AARCH64 BARE-METAL TARGET COMPILER（ aarch644-none-felf ）我尝试使用另一个AARCH32 BARE-METAL目标编译器（ arm-nore-none-eabi ），但是还有更多问题。他甚至无法构建项目并丢弃汇编程序错误。

Error: selected processor does not support requested special purpose register -- `msr tpidr_el 1,xzr'
Error: ARM register expected -- `ldr x1,=_start'

还有更多类似的

我的制作费，也许它的帮助

PWD := $(shell pwd)
PRJ_BUILD := $(PWD)/build
CC  := aarch64-none-elf-gcc
LD  := aarch64-none-elf-ld
OBJCOPY := aarch64-none-elf-objcopy
OBJDUMP := aarch64-none-elf-objdump

SRC := src/entry_point.S
SRC += src/cache.S
SRC += src/main.c
SRC += src/stub.c
SRC := $(addprefix $(PWD)/,$(SRC))

INCLUDES := .
INCLUDES += src
INCLUDES := $(addprefix -I$(PWD)/,$(INCLUDES))

CFLAGS := -c -g 
#CFLAGS += -march=armv8.2-a -mcpu=cortex-a55
CFLAGS += -mcpu=cortex-a55
#-mcpu=cortex-a55 -mfloat-abi=hard

define get_library_path
    $(shell dirname $(shell $(CC) $(CFLAGS) -print-file-name=$(1)))
endef
LDFLAGS += -L $(call get_library_path,libc.a)
LDFLAGS += -L $(call get_library_path,libgcc.a)
LDFLAGS += -T $(PWD)/link.lds -lgcc -lc


all: app.elf

app.elf:
    $(info $(PWD))
    $(info SRC:[$(SRC)])
    $(info INCLUDES:[$(INCLUDES)])
    cd $(PRJ_BUILD) && $(CC) $(CFLAGS) $(INCLUDES) $(SRC)
    cd $(PRJ_BUILD) && \
        $(LD) -o app.elf $(PRJ_BUILD)/*.o \
        $(LDFLAGS) -Map app.map
    cd $(PRJ_BUILD) && $(OBJCOPY) -O binary app.elf app.bin
    cd $(PRJ_BUILD) && $(OBJDUMP) app.elf -dS > app.lst

    
clean:
    cd $(PRJ_BUILD) && rm -f *.*

，我很高兴至少有一些建议

原文

I'm trying to get started with the RK3568 controller (cortex a55)
I have a project and a makefile
I managed to output the character using registers and flashing the LED.
But if I try to output a string using printf, the program just freezes without any signs of life.
I was looking for a solution to the problem, and the main solution is to implement the _write function(int file, char *ptr, int len), which the standard printf function should use. But it doesn't help.
I tried to connect another Printf function from github and it works. I don't understand what the reason is.
I tried to call other functions from the standard library, for example strlen and it has the same behavior as printf

int _write(int file, char *ptr, int len)
{
    __io_putchar('w');
    int DataIdx;

    for (DataIdx = 0; DataIdx < len; DataIdx++)
    {
        __io_putchar( *ptr++ );
    }
    return len;
}

I am using the AArch64 bare-metal target compiler (aarch64-none-elf)
I tried using another AArch32 bare-metal target compiler (arm-none-eabi), but there are even more problems with it. He can't even build the project and throws assembler errors.

Error: selected processor does not support requested special purpose register -- `msr tpidr_el 1,xzr'
Error: ARM register expected -- `ldr x1,=_start'

and many more similar

my makefile, maybe its help

PWD := $(shell pwd)
PRJ_BUILD := $(PWD)/build
CC  := aarch64-none-elf-gcc
LD  := aarch64-none-elf-ld
OBJCOPY := aarch64-none-elf-objcopy
OBJDUMP := aarch64-none-elf-objdump

SRC := src/entry_point.S
SRC += src/cache.S
SRC += src/main.c
SRC += src/stub.c
SRC := $(addprefix $(PWD)/,$(SRC))

INCLUDES := .
INCLUDES += src
INCLUDES := $(addprefix -I$(PWD)/,$(INCLUDES))

CFLAGS := -c -g 
#CFLAGS += -march=armv8.2-a -mcpu=cortex-a55
CFLAGS += -mcpu=cortex-a55
#-mcpu=cortex-a55 -mfloat-abi=hard

define get_library_path
    $(shell dirname $(shell $(CC) $(CFLAGS) -print-file-name=$(1)))
endef
LDFLAGS += -L $(call get_library_path,libc.a)
LDFLAGS += -L $(call get_library_path,libgcc.a)
LDFLAGS += -T $(PWD)/link.lds -lgcc -lc


all: app.elf

app.elf:
    $(info $(PWD))
    $(info SRC:[$(SRC)])
    $(info INCLUDES:[$(INCLUDES)])
    cd $(PRJ_BUILD) && $(CC) $(CFLAGS) $(INCLUDES) $(SRC)
    cd $(PRJ_BUILD) && \
        $(LD) -o app.elf $(PRJ_BUILD)/*.o \
        $(LDFLAGS) -Map app.map
    cd $(PRJ_BUILD) && $(OBJCOPY) -O binary app.elf app.bin
    cd $(PRJ_BUILD) && $(OBJDUMP) app.elf -dS > app.lst

    
clean:
    cd $(PRJ_BUILD) && rm -f *.*

I would be glad to at least some advice

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爱情眠于流年 2025-02-07 23:55:56

最后我能够解决这个问题
I tried to do the following

I implemented the _sbrk function (get from
我试图突出显示堆和堆栈
我实现了 _write 函数（但没有触摸 _write_r [！]）
我提供了 memcmp 的实现
实际上，项目编号对工作的影响最大。4。如果您删除除点4以外的所有内容，则代码可以工作，我可以输出“ Hello World”！
让我提醒您，我使用 AARCH64-NONE-FEL-GCC
项目4我从这里