Question

不包含头文件（stdint.h）。我知道很多代码都在关注，但我真的不知道。

我的档案：

gdt.c

/* We need 8 segments */
#include <stdint.h>
#include "gdt.h"
#define GDT_SIZE 8
uint32_t intr;

gdt_entry gdtable[GDT_SIZE];

包括/ gdt.h

#ifndef GDT_H
#define GDT_H
#include <stdint.h>
struct gdt_entry{
    uint_16t limit;
    uint_32t base :24;
    uint_32t accessbyte :8;
    uint_32t limit2 :4;
    uint_32t flags2 :4;
    uint_32t base2 :8;
}__attribute__((packed));
#endif

包括/ stdint.h

#ifndef STDINT_H
#define STDINT_H

typedef unsigned long long uint64_t;
typedef unsigned int uint32_t;
typedef unsigned short uint16_t;
typedef unsigned char uint8_t;

typedef signed long long int64_t;
typedef signed int int32_t;
typedef signed short int16_t;
typedef signed char int8_t;

#endif

生成文件：

SRCS = $(shell find -name '*.[cS]')
OBJS = $(addsuffix .o,$(basename $(SRCS)))

CC = gcc
LD = ld

ASFLAGS = -m32
CFLAGS = -m32 -Wall -g -fno-stack-protector -I include
LDFLAGS = -melf_i386 -Tkernel.ld

kernel: $(OBJS)
    $(LD) $(LDFLAGS) -o $@ $^

%.o: %.c
    $(CC) $(CFLAGS) -c -o $@ $^

%.o: %.S
    $(CC) $(ASFLAGS) -c -o $@ $^

clean:
    rm $(OBJS)

.PHONY: clean

kernel.ld

/*  start should be executed first */
ENTRY(_start)

/*
 * thats how the sections should be written in the .elf binary
 */
SECTIONS
{
    /*
     * the first section has a 1MB Offset for the grub bootloader
     */
    . = 0x100000;

     /*
      * the multiboot header comes first
      */
     .text : {
         *(multiboot)
         *(.text)
     }
     .data ALIGN(4096) : {
         *(.data)
     }
     .rodata ALIGN(4096) : {
         *(.rodata)
     }
     .bss ALIGN(4096) : {
         *(.bss)
     }
}

gcc输出：

gcc -m32 -c -o start.o start.S
gcc -m32 -Wall -g -fno-stack-protector -I include -c -o gdt.o gdt.c
In file included from gdt.c:3:0:
include/gdt.h:5:2: error: unknown type name ‘uint_16t’
include/gdt.h:6:2: error: unknown type name ‘uint_32t’
include/gdt.h:7:2: error: unknown type name ‘uint_32t’
include/gdt.h:8:2: error: unknown type name ‘uint_32t’
include/gdt.h:9:2: error: unknown type name ‘uint_32t’
include/gdt.h:10:2: error: unknown type name ‘uint_32t’
gdt.c:7:1: error: unknown type name ‘gdt_entry’
make: *** [gdt.o] Error 1

Answer 1

我认为您应该使用uint32_t而不是非标准uint_32t。它至少是我遇到过的第三种变体，之前我也见过u_int32_t。

Answer 2

还有另一个问题： gdt_entry gdtable [GDT_SIZE];应该是struct gdt_entry gdtable [GDT_SIZE]

未正确包含头文件

2 个答案: