fix: remove useless c code (#1116)

* fix: remove useless c code

remove printk.c file
remove old test_ebpf file
implement `lookup_kallsyms` and `addr_from_symbol` using rust

* fix the weak linkage

* feat(kernel): 添加cfg-if依赖并优化panic模块的条件编译

Signed-off-by: longjin <[email protected]>

---------

Signed-off-by: longjin <[email protected]>
Co-authored-by: longjin <[email protected]>

docs/kernel/core_api/kernel_api.md

@@ -572,86 +572,6 @@
 
   第二个字符串
 
-#### `printk(const char* fmt, ...)`
-
-##### 描述
-
-  该宏能够在控制台上以黑底白字格式化输出字符串.
-
-##### 参数
-
-**fmt**
-
-  源格式字符串
-
-**...**
-
-  可变参数
-
-#### `printk_color(unsigned int FRcolor, unsigned int BKcolor, const char* fmt, ...)`
-
-##### 描述
-
-  在控制台上以指定前景色和背景色格式化输出字符串.
-
-##### 参数
-
-**FRcolor**
-
-  前景色
-
-**BKcolor**
-
-  背景色
-
-**fmt**
-
-  源格式字符串
-
-**...**
-
-  可变参数
-
-#### `int vsprintf(char *buf, const char *fmt, va_list args)`
-
-##### 描述
-
-  按照fmt格式化字符串，并将结果输出到buf中，返回写入buf的字符数量。
-
-##### 参数
-
-**buf**
-
-  输出缓冲区
-
-**fmt**
-
-  源格式字符串
-
-**args**
-
-  可变参数列表
-
-#### `int sprintk(char *buf, const char *fmt, ...)`
-
-##### 描述
-
-  按照fmt格式化字符串，并将结果输出到buf中，返回写入buf的字符数量。
-
-##### 参数
-
-**buf**
-
-  输出缓冲区
-
-**fmt**
-
-  源格式字符串
-
-**...**
-
-  可变参数
-
 ### 内存操作
 
 #### `void *memcpy(void *dst, const void *src, uint64_t size)`

kernel/Cargo.lock

@@ -449,6 +449,7 @@ dependencies = [
  "bitfield-struct",
  "bitflags 1.3.2",
  "bitmap",
+ "cfg-if",
  "defer",
  "driver_base_macros",
  "elf 0.7.2",

kernel/Cargo.toml

@@ -76,6 +76,7 @@ unwinding = { git = "https://git.mirrors.dragonos.org.cn/DragonOS-Community/unwi
     "personality"
 ]}
 defer = "0.2.1"
+cfg-if = { version = "1.0.0" }
 
 # target为x86_64时，使用下面的依赖
 [target.'cfg(target_arch = "x86_64")'.dependencies]

kernel/src/common/kprint.h

@@ -11,68 +11,3 @@
 #pragma once
 #include "printk.h"
 
-#define ksuccess(...)                          \
-    do                                         \
-    {                                          \
-        printk("[ ");                          \
-        printk_color(GREEN, BLACK, "SUCCESS"); \
-        printk(" ] ");                         \
-        printk(__VA_ARGS__);                   \
-        printk("\n");                          \
-    } while (0)
-
-#define kinfo(...)           \
-    do                       \
-    {                        \
-        printk("[ INFO ] "); \
-        printk(__VA_ARGS__); \
-        printk("\n");        \
-    } while (0)
-
-#define kdebug(...)                                        \
-    do                                                     \
-    {                                                      \
-        printk("[ DEBUG ] (%s:%d)\t", __FILE__, __LINE__); \
-        printk(__VA_ARGS__);                               \
-        printk("\n");                                      \
-    } while (0)
-
-#define kwarn(...)                                 \
-    do                                             \
-    {                                              \
-        printk("[ ");                              \
-        printk_color(YELLOW, BLACK, "WARN");       \
-        printk(" ] "); \
-        printk(__VA_ARGS__);                       \
-        printk("\n");                              \
-    } while (0)
-
-#define kerror(...)                        \
-    do                                     \
-    {                                      \
-        printk("[ ");                      \
-        printk_color(RED, BLACK, "ERROR"); \
-        printk(" ] ");                     \
-        printk(__VA_ARGS__);               \
-        printk("\n");                      \
-    } while (0)
-
-#define kterminated(...)                        \
-    do                                          \
-    {                                           \
-        printk("[ ");                           \
-        printk_color(RED, BLACK, "TERMINATED"); \
-        printk(" ] ");                          \
-        printk(__VA_ARGS__);                    \
-        printk("\n");                           \
-    } while (0)
-
-#define kBUG(...)                                   \
-    do                                              \
-    {                                               \
-        printk("[ ");                               \
-        printk_color(RED, BLACK, "BUG");            \
-        printk(" ] (%s:%d)\t", __FILE__, __LINE__); \
-        printk(__VA_ARGS__);                        \
-        printk("\n");                               \
-    } while (0)

kernel/src/common/printk.h

@@ -34,46 +34,4 @@
 #include "glib.h"
 #include <stdarg.h>
 
-/**
- * @brief 将字符串按照fmt和args中的内容进行格式化，然后保存到buf中
- *
- * @param buf 结果缓冲区
- * @param fmt 格式化字符串
- * @param args 内容
- * @return 最终字符串的长度
- */
-int vsprintf(char *buf, const char *fmt, va_list args);
-
-/**
- * @brief 将字符串按照fmt和args中的内容进行格式化，截取字符串前buf_size-1，保存到buf中
- *
- * @param buf 结果缓冲区，大小为buf_size
- * @param fmt 格式化字符串
- * @param buf_size 缓冲区长度
- * @param args 内容
- * @return 最终字符串的长度
- */
-int vsnprintf(char *buf, const char *fmt, int buf_size, va_list args);
-
-/**
- * @brief 格式化打印字符串
- *
- * @param FRcolor 前景色
- * @param BKcolor 背景色
- * @param ... 格式化字符串
- */
-
-#define printk(...) printk_color(WHITE, BLACK, __VA_ARGS__)
-
-int printk_color(unsigned int FRcolor, unsigned int BKcolor, const char *fmt, ...);
-
-/**
- * @brief 格式化字符串并输出到buf
- *
- * @param buf 输出缓冲区
- * @param fmt 格式
- * @param ... 参数
- * @return int 字符串长度
- */
-int sprintk(char *buf, const char *fmt, ...);
 #pragma GCC pop_options

kernel/src/common/stdio.h

@@ -7,7 +7,3 @@
 #define	SEEK_END	2	/* Seek relative to end-of-file */
 
 #define SEEK_MAX	3
-
-extern int vsprintf(char *buf, const char *fmt, va_list args);
-
-extern int sprintk(char *buf, const char *fmt, ...);

kernel/src/debug/Makefile

@@ -9,10 +9,6 @@ kallsyms.o: kallsyms.c
 	gcc -o kallsyms kallsyms.c
 	rm -rf kallsyms.o
 
-traceback.o: traceback/traceback.c
-	$(CC) $(CFLAGS) -c traceback/traceback.c -o traceback/traceback.o
-
-
 # 生成内核栈符号表的汇编文件
 generate_kallsyms: kallsyms.o 
 	echo "Generating kallsyms..."

kernel/src/debug/kprobe/args.rs

@@ -1,3 +1,4 @@
+use crate::debug::traceback::addr_from_symbol;
 use alloc::boxed::Box;
 use alloc::string::String;
 use kprobe::{CallBackFunc, KprobeBuilder, ProbeArgs};
@@ -15,10 +16,6 @@ pub struct KprobeInfo {
     pub enable: bool,
 }
 
-extern "C" {
-    fn addr_from_symbol(symbol: *const u8) -> usize;
-}
-
 impl TryFrom<KprobeInfo> for KprobeBuilder {
     type Error = SystemError;
     fn try_from(kprobe_info: KprobeInfo) -> Result<Self, Self::Error> {
@@ -30,20 +27,15 @@ impl TryFrom<KprobeInfo> for KprobeBuilder {
             return Err(SystemError::EINVAL);
         }
         let func_addr = if let Some(symbol) = kprobe_info.symbol.clone() {
-            let mut symbol_sting = symbol;
-            if !symbol_sting.ends_with("\0") {
-                symbol_sting.push('\0');
-            }
-            let symbol = symbol_sting.as_ptr();
-            let func_addr = unsafe { addr_from_symbol(symbol) };
-            if func_addr == 0 {
+            let func_addr = unsafe { addr_from_symbol(symbol.as_str()) };
+            if func_addr.is_none() {
                 warn!(
                     "register_kprobe: the symbol: {:?} not found",
                     kprobe_info.symbol
                 );
                 return Err(SystemError::ENXIO);
             }
-            func_addr
+            func_addr.unwrap() as usize
         } else {
             kprobe_info.addr.unwrap()
         };

kernel/src/debug/mod.rs

@@ -2,3 +2,4 @@ pub mod jump_label;
 pub mod klog;
 pub mod kprobe;
 pub mod panic;
+pub mod traceback;

kernel/src/debug/panic/hook.rs

@@ -1,10 +1,7 @@
+use crate::debug::traceback::lookup_kallsyms;
 use unwinding::abi::{UnwindContext, UnwindReasonCode, _Unwind_GetIP};
 use unwinding::panic::UserUnwindTrace;
 
-extern "C" {
-    fn lookup_kallsyms(addr: u64, level: i32) -> i32;
-}
-
 /// User hook for unwinding
 ///
 /// During stack backtrace, the user can print the function location of the current stack frame.

kernel/src/debug/panic/mod.rs

@@ -1,7 +1,15 @@
 #[cfg(feature = "backtrace")]
 mod hook;
-use core::panic::PanicInfo;
+use cfg_if::cfg_if;
 
+cfg_if! {
+    if #[cfg(target_os = "none")] {
+        use core::panic::PanicInfo;
+        use core::sync::atomic::AtomicU8;
+
+        static PANIC_COUNTER: AtomicU8 = AtomicU8::new(0);
+    }
+}
 /// 全局的panic处理函数
 ///
 #[cfg(target_os = "none")]
@@ -11,7 +19,7 @@ pub fn panic(info: &PanicInfo) -> ! {
     use log::error;
 
     use crate::process;
-
+    PANIC_COUNTER.fetch_add(1, core::sync::atomic::Ordering::Relaxed);
     error!("Kernel Panic Occurred.");
 
     match info.location() {
@@ -28,6 +36,13 @@ pub fn panic(info: &PanicInfo) -> ! {
         }
     }
     println!("Message:\n\t{}", info.message());
+    if PANIC_COUNTER.load(core::sync::atomic::Ordering::Relaxed) > 8 {
+        println!(
+            "Panic Counter: {}, too many panics, halt.",
+            PANIC_COUNTER.load(core::sync::atomic::Ordering::Relaxed)
+        );
+        loop {}
+    }
     #[cfg(feature = "backtrace")]
     {
         let mut data = hook::CallbackData { counter: 0 };

kernel/src/debug/traceback/mod.rs

@@ -0,0 +1,62 @@
+use core::ffi::CStr;
+
+#[linkage = "weak"]
+#[no_mangle]
+fn kallsyms_address() {}
+#[linkage = "weak"]
+#[no_mangle]
+fn kallsyms_num() {}
+#[linkage = "weak"]
+#[no_mangle]
+fn kallsyms_names_index() {}
+#[linkage = "weak"]
+#[no_mangle]
+fn kallsyms_names() {}
+
+pub unsafe fn lookup_kallsyms(addr: u64, level: i32) -> Option<()> {
+    let sym_names = kallsyms_names as *const u8;
+    // 由于符号表使用nm -n生成，因此是按照地址升序排列的，因此可以二分
+    let sym_num = kallsyms_num as usize;
+    let kallsyms_address_list =
+        core::slice::from_raw_parts(kallsyms_address as *const u64, sym_num);
+    let sym_names_index = kallsyms_names_index as *const u64;
+    let sym_names_index = core::slice::from_raw_parts(sym_names_index, sym_num);
+    let mut index = usize::MAX;
+    for i in 0..sym_num - 1 {
+        if addr > kallsyms_address_list[i] && addr <= kallsyms_address_list[i + 1] {
+            index = i;
+            break;
+        }
+    }
+    return if index < sym_num {
+        let sym_name = CStr::from_ptr(sym_names.add(sym_names_index[index] as usize) as _)
+            .to_str()
+            .unwrap();
+        println!(
+            "[{}] function:{}() \t(+) {:04} address:{:#018x}",
+            level,
+            sym_name,
+            addr - kallsyms_address_list[index],
+            addr
+        );
+        Some(())
+    } else {
+        None
+    };
+}
+pub unsafe fn addr_from_symbol(symbol: &str) -> Option<u64> {
+    let sym_num = kallsyms_num as usize;
+    let sym_names = kallsyms_names as *const u8;
+    let kallsyms_address_list =
+        core::slice::from_raw_parts(kallsyms_address as *const u64, sym_num);
+    let sym_names_index = kallsyms_names_index as *const u64;
+    let sym_names_index_list = core::slice::from_raw_parts(sym_names_index, sym_num);
+    for i in 0..sym_num {
+        let sym_name_cstr = CStr::from_ptr(sym_names.add(sym_names_index_list[i] as usize) as _);
+        let sym_name = sym_name_cstr.to_str().unwrap();
+        if sym_name == symbol {
+            return Some(kallsyms_address_list[i]);
+        }
+    }
+    None
+}

kernel/src/debug/traceback/traceback.c

@@ -1,84 +0,0 @@
-#include "traceback.h"
-#include <common/printk.h>
-#include <common/string.h>
-#include <process/process.h>
-
-int lookup_kallsyms(uint64_t addr, int level)
-{
-    const char *str = (const char *)&kallsyms_names;
-
-    // 暴力查找符合要求的symbol
-    // todo: 改用二分搜索。
-    // 由于符号表使用nm -n生成，因此是按照地址升序排列的，因此可以二分
-    uint64_t index = 0;
-    for (index = 0; index < kallsyms_num - 1; ++index)
-    {
-        if (addr > kallsyms_address[index] && addr <= kallsyms_address[index + 1])
-            break;
-    }
-
-    if (index < kallsyms_num) // 找到对应的函数
-    {
-        // 依次输出函数名称、rip离函数起始处的偏移量、函数执行的rip
-        printk("function:%s() \t(+) %04d address:%#018lx\n", &str[kallsyms_names_index[index]], addr - kallsyms_address[index], addr);
-        return 0;
-    }
-    else
-        return -1;
-}
-
-uint64_t addr_from_symbol(const char *symbol)
-{
-    const char *str = (const char *)&kallsyms_names;
-    for (uint64_t i = 0; i < kallsyms_num; ++i)
-    {
-        if (strcmp(&str[kallsyms_names_index[i]], symbol) == 0)
-            return kallsyms_address[i];
-    }
-    return 0;
-
-}
-
-/**
- * @brief 追溯内核栈调用情况
- *
- * @param regs 内核栈结构体
- */
-void traceback(struct pt_regs *regs)
-{
-    // 先检验是否为用户态出错，若为用户态出错，则直接返回
-    if (verify_area(regs->rbp, 0))
-    {
-        printk_color(YELLOW, BLACK, "Kernel traceback: Fault in userland. pid=%ld, rbp=%#018lx\n", rs_current_pcb_pid(), regs->rbp);
-        return;
-    }
-
-    uint64_t *rbp = (uint64_t *)regs->rbp;
-    printk_color(YELLOW, BLACK, "======== Kernel traceback =======\n");
-    // printk("&kallsyms_address:%#018lx,kallsyms_address:%#018lx\n", &kallsyms_address, kallsyms_address);
-    // printk("&kallsyms_syms_num:%#018lx,kallsyms_syms_num:%d\n", &kallsyms_num, kallsyms_num);
-    // printk("&kallsyms_index:%#018lx\n", &kallsyms_names_index);
-    // printk("&kallsyms_names:%#018lx,kallsyms_names:%s\n", &kallsyms_names, &kallsyms_names);
-
-    uint64_t ret_addr = regs->rip;
-    // 最大追踪10层调用栈
-    for (int i = 0; i < 10; ++i)
-    {
-        if (lookup_kallsyms(ret_addr, i) != 0)
-            break;
-
-        // 当前栈帧的rbp的地址大于等于内核栈的rbp的时候，表明调用栈已经到头了，追踪结束。
-        // 当前rbp的地址为用户空间时，直接退出
-        if ((uint64_t)(rbp) >= rs_current_pcb_thread_rbp() || ((uint64_t)rbp < regs->rsp))
-            break;
-
-        printk_color(ORANGE, BLACK, "rbp:%#018lx,*rbp:%#018lx\n", rbp, *rbp);
-
-        // 由于x86处理器在执行call指令时，先将调用返回地址压入栈中，然后再把函数的rbp入栈，最后将rsp设为新的rbp。
-        // 因此，此处的rbp就是上一层的rsp，那么，*(rbp+1)得到的就是上一层函数的返回地址
-        ret_addr = *(rbp + 1);
-        rbp = (uint64_t *)(*rbp);
-        printk("\n");
-    }
-    printk_color(YELLOW, BLACK, "======== Kernel traceback end =======\n");
-}

kernel/src/debug/traceback/traceback.h

@@ -1,18 +0,0 @@
-#pragma once
-#include <common/glib.h>
-#include <process/ptrace.h>
-
-// 使用弱引用属性导出kallsyms中的符号表。
-// 采用weak属性是由于第一次编译时，kallsyms还未链接进来，若不使用weak属性则会报错
-extern const uint64_t kallsyms_address[] __attribute__((weak));
-extern const uint64_t kallsyms_num __attribute__((weak));
-extern const uint64_t kallsyms_names_index[] __attribute__((weak));
-extern const char *kallsyms_names __attribute__((weak));
-
-/**
- * @brief 追溯内核栈调用情况
- *
- * @param regs 内核栈结构体
- */
-void traceback(struct pt_regs *regs);
-uint64_t addr_from_symbol(const char *symbol);

kernel/src/lib.rs

@@ -19,6 +19,7 @@
 #![feature(vec_into_raw_parts)]
 #![feature(c_variadic)]
 #![feature(asm_goto)]
+#![feature(linkage)]
 #![cfg_attr(target_os = "none", no_std)]
 #![allow(static_mut_refs, non_local_definitions, internal_features)]
 // clippy的配置

kernel/src/libs/printk.c

@@ -1,631 +0,0 @@
-//
-// Created by longjin on 2022/1/22.
-//
-#include <common/kprint.h>
-#include <common/printk.h>
-
-#include <common/spinlock.h>
-#include <libs/lib_ui/textui.h>
-#include <mm/mm.h>
-
-#include <common/math.h>
-#include <common/string.h>
-
-static spinlock_t __printk_lock = {1};
-/**
- * @brief 将数字按照指定的要求转换成对应的字符串（2~36进制）
- *
- * @param str 要返回的字符串
- * @param num 要打印的数值
- * @param base 基数
- * @param field_width 区域宽度
- * @param precision 精度
- * @param flags 标志位
- */
-static char *write_num(char *str, ul num, int base, int field_width, int precision, int flags);
-
-static char *write_float_point_num(char *str, double num, int field_width, int precision, int flags);
-
-static int skip_and_atoi(const char **s)
-{
-    /**
-     * @brief 获取连续的一段字符对应整数的值
-     * @param:**s 指向 指向字符串的指针 的指针
-     */
-    int ans = 0;
-    while (is_digit(**s))
-    {
-        ans = ans * 10 + (**s) - '0';
-        ++(*s);
-    }
-    return ans;
-}
-
-/**
- * @brief 将字符串按照fmt和args中的内容进行格式化，当buf_size为-1时，字符串直接保存到buf中
- * 否则将字符串前buf_size-1个字符放入，大小为buf_size的buf数组中
- *
- * @param buf 结果缓冲区
- * @param fmt 格式化字符串
- * @param args 内容
- * @param buf_size buf_size为-1时，不指定buf的大小，否则buf大小为buf_size
- * @return 最终字符串的长度
- */
-static int __do_vsprintf(char *buf, const char *fmt, int buf_size, va_list args)
-{
-
-    // 当需要输出的字符串的指针为空时，使用该字符填充目标字符串的指针
-    static const char __end_zero_char = '\0';
-
-    char *str = NULL, *s = NULL, *end = NULL;
-
-    str = buf;
-
-    int flags;       // 用来存储格式信息的bitmap
-    int field_width; //区域宽度
-    int precision;   //精度
-    int qualifier;   //数据显示的类型
-    int len;
-
-    if (buf_size != -1)
-    {
-        end = buf + buf_size;
-    }
-    //开始解析字符串
-    for (; *fmt; ++fmt)
-    {
-        //内容不涉及到格式化，直接输出
-        if (*fmt != '%')
-        {
-            *str = *fmt;
-            ++str;
-            continue;
-        }
-
-        //开始格式化字符串
-
-        //清空标志位和field宽度
-        field_width = flags = 0;
-
-        bool flag_tmp = true;
-        bool flag_break = false;
-
-        ++fmt;
-        while (flag_tmp)
-        {
-            switch (*fmt)
-            {
-            case '\0':
-                //结束解析
-                flag_break = true;
-                flag_tmp = false;
-                break;
-
-            case '-':
-                // 左对齐
-                flags |= LEFT;
-                ++fmt;
-                break;
-            case '+':
-                //在正数前面显示加号
-                flags |= PLUS;
-                ++fmt;
-                break;
-            case ' ':
-                flags |= SPACE;
-                ++fmt;
-                break;
-            case '#':
-                //在八进制数前面显示 '0o'，在十六进制数前面显示 '0x' 或 '0X'
-                flags |= SPECIAL;
-                ++fmt;
-                break;
-            case '0':
-                //显示的数字之前填充‘0’来取代空格
-                flags |= PAD_ZERO;
-                ++fmt;
-                break;
-            default:
-                flag_tmp = false;
-                break;
-            }
-        }
-        if (flag_break)
-            break;
-
-        //获取区域宽度
-        field_width = -1;
-        if (*fmt == '*')
-        {
-            field_width = va_arg(args, int);
-            ++fmt;
-        }
-        else if (is_digit(*fmt))
-        {
-            field_width = skip_and_atoi(&fmt);
-            if (field_width < 0)
-            {
-                field_width = -field_width;
-                flags |= LEFT;
-            }
-        }
-
-        //获取小数精度
-        precision = -1;
-        if (*fmt == '.')
-        {
-            ++fmt;
-            if (*fmt == '*')
-            {
-                precision = va_arg(args, int);
-                ++fmt;
-            }
-            else if (is_digit(*fmt))
-            {
-                precision = skip_and_atoi(&fmt);
-            }
-        }
-
-        //获取要显示的数据的类型
-        if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || *fmt == 'Z')
-        {
-            qualifier = *fmt;
-            ++fmt;
-        }
-        //为了支持lld
-        if (qualifier == 'l' && *fmt == 'l', *(fmt + 1) == 'd')
-            ++fmt;
-
-        //转化成字符串
-        long long *ip;
-        switch (*fmt)
-        {
-        //输出 %
-        case '%':
-            *str++ = '%';
-
-            break;
-        // 显示一个字符
-        case 'c':
-            //靠右对齐
-            if (!(flags & LEFT))
-            {
-                while (--field_width > 0)
-                {
-                    *str = ' ';
-                    ++str;
-                }
-            }
-
-            *str++ = (unsigned char)va_arg(args, int);
-
-            while (--field_width > 0)
-            {
-                *str = ' ';
-                ++str;
-            }
-
-            break;
-
-        //显示一个字符串
-        case 's':
-            s = va_arg(args, char *);
-            if (!s)
-                s = &__end_zero_char;
-            len = strlen(s);
-            if (precision < 0)
-            {
-                //未指定精度
-                precision = len;
-            }
-
-            else if (len > precision)
-            {
-                len = precision;
-            }
-
-            //靠右对齐
-            if (!(flags & LEFT))
-                while (len < field_width--)
-                {
-                    *str = ' ';
-                    ++str;
-                }
-
-            for (int i = 0; i < len; i++)
-            {
-                *str = *s;
-                ++s;
-                ++str;
-            }
-
-            while (len < field_width--)
-            {
-                *str = ' ';
-                ++str;
-            }
-
-            break;
-        //以八进制显示字符串
-        case 'o':
-            flags |= SMALL;
-        case 'O':
-            flags |= SPECIAL;
-            if (qualifier == 'l')
-                str = write_num(str, va_arg(args, long long), 8, field_width, precision, flags);
-            else
-                str = write_num(str, va_arg(args, int), 8, field_width, precision, flags);
-            break;
-
-        //打印指针指向的地址
-        case 'p':
-            if (field_width == 0)
-            {
-                field_width = 2 * sizeof(void *);
-                flags |= PAD_ZERO;
-            }
-
-            str = write_num(str, (unsigned long)va_arg(args, void *), 16, field_width, precision, flags);
-
-            break;
-
-        //打印十六进制
-        case 'x':
-            flags |= SMALL;
-        case 'X':
-            // flags |= SPECIAL;
-            if (qualifier == 'l')
-                str = write_num(str, va_arg(args, ll), 16, field_width, precision, flags);
-            else
-                str = write_num(str, va_arg(args, int), 16, field_width, precision, flags);
-            break;
-
-        //打印十进制有符号整数
-        case 'i':
-        case 'd':
-
-            flags |= SIGN;
-            if (qualifier == 'l')
-                str = write_num(str, va_arg(args, long long), 10, field_width, precision, flags);
-            else
-                str = write_num(str, va_arg(args, int), 10, field_width, precision, flags);
-            break;
-
-        //打印十进制无符号整数
-        case 'u':
-            if (qualifier == 'l')
-                str = write_num(str, va_arg(args, unsigned long long), 10, field_width, precision, flags);
-            else
-                str = write_num(str, va_arg(args, unsigned int), 10, field_width, precision, flags);
-            break;
-
-        //输出有效字符数量到*ip对应的变量
-        case 'n':
-
-            if (qualifier == 'l')
-                ip = va_arg(args, long long *);
-            else
-                ip = (ll *)va_arg(args, int *);
-
-            *ip = str - buf;
-            break;
-        case 'f':
-            // 默认精度为3
-            // printk("1111\n");
-            // va_arg(args, double);
-            // printk("222\n");
-
-            if (precision < 0)
-                precision = 3;
-
-            str = write_float_point_num(str, va_arg(args, double), field_width, precision, flags);
-
-            break;
-
-        //对于不识别的控制符，直接输出
-        default:
-            *str++ = '%';
-            if (*fmt)
-                *str++ = *fmt;
-            else
-                --fmt;
-            break;
-        }
-    }
-    //实现vsnprintf 的功能
-    if (buf_size > 0)
-    {
-        if (str < end)
-        {
-            *str = '\0';
-        }
-        else
-        {
-            *(end-1) = '\0';
-        }
-        return buf_size;
-    }
-    else
-    {
-        *str = '\0';
-    }
-
-    //返回缓冲区已有字符串的长度。
-    return str - buf;
-}
-
-/**
- * 将字符串按照fmt和args中的内容进行格式化，然后保存到buf中
- * @param buf 结果缓冲区
- * @param fmt 格式化字符串
- * @param args 内容
- * @return 最终字符串的长度
- */
-int vsprintf(char *buf, const char *fmt, va_list args)
-{
-    return __do_vsprintf(buf, fmt, -1, args);
-}
-
-/**
- * @brief 将字符串按照fmt和args中的内容进行格式化，截取字符串前buf_size-1，保存到buf中
- *
- * @param buf 结果缓冲区，大小为buf_size
- * @param fmt 格式化字符串
- * @param buf_size 缓冲区长度
- * @param args 内容
- * @return 最终字符串的长度
- */
-int vsnprintf(char *buf, const char *fmt, int buf_size, va_list args)
-{
-    return __do_vsprintf(buf, fmt, buf_size, args);
-}
-
-static char *write_num(char *str, ul num, int base, int field_width, int precision, int flags)
-{
-    /**
-     * @brief 将数字按照指定的要求转换成对应的字符串
-     *
-     * @param str 要返回的字符串
-     * @param num 要打印的数值
-     * @param base 基数
-     * @param field_width 区域宽度
-     * @param precision 精度
-     * @param flags 标志位
-     */
-
-    // 首先判断是否支持该进制
-    if (base < 2 || base > 36)
-        return 0;
-    char pad, sign, tmp_num[100];
-
-    const char *digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
-    // 显示小写字母
-    if (flags & SMALL)
-        digits = "0123456789abcdefghijklmnopqrstuvwxyz";
-
-    if (flags & LEFT)
-        flags &= ~PAD_ZERO;
-    // 设置填充元素
-    pad = (flags & PAD_ZERO) ? '0' : ' ';
-
-    sign = 0;
-
-    if (flags & SIGN)
-    {
-        int64_t signed_num = (int64_t)num;
-        if (signed_num < 0)
-        {
-            sign = '-';
-            num = -signed_num;
-        }
-        else
-            num = signed_num;
-    }
-    else
-    {
-        // 设置符号
-        sign = (flags & PLUS) ? '+' : ((flags & SPACE) ? ' ' : 0);
-    }
-
-    // sign占用了一个宽度
-    if (sign)
-        --field_width;
-
-    if (flags & SPECIAL)
-        if (base == 16) // 0x占用2个位置
-            field_width -= 2;
-        else if (base == 8) // O占用一个位置
-            --field_width;
-
-    int js_num = 0; // 临时数字字符串tmp_num的长度
-
-    if (num == 0)
-        tmp_num[js_num++] = '0';
-    else
-    {
-        num = ABS(num);
-        //进制转换
-        while (num > 0)
-        {
-            tmp_num[js_num++] = digits[num % base]; // 注意这里，输出的数字，是小端对齐的。低位存低位
-            num /= base;
-        }
-    }
-
-    if (js_num > precision)
-        precision = js_num;
-
-    field_width -= precision;
-
-    // 靠右对齐
-    if (!(flags & (LEFT + PAD_ZERO)))
-        while (field_width-- > 0)
-            *str++ = ' ';
-
-    if (sign)
-        *str++ = sign;
-    if (flags & SPECIAL)
-        if (base == 16)
-        {
-            *str++ = '0';
-            *str++ = digits[33];
-        }
-        else if (base == 8)
-            *str++ = digits[24]; //注意这里是英文字母O或者o
-    if (!(flags & LEFT))
-        while (field_width-- > 0)
-            *str++ = pad;
-    while (js_num < precision)
-    {
-        --precision;
-        *str++ = '0';
-    }
-
-    while (js_num-- > 0)
-        *str++ = tmp_num[js_num];
-
-    while (field_width-- > 0)
-        *str++ = ' ';
-
-    return str;
-}
-
-static char *write_float_point_num(char *str, double num, int field_width, int precision, int flags)
-{
-    /**
-     * @brief 将浮点数按照指定的要求转换成对应的字符串
-     *
-     * @param str 要返回的字符串
-     * @param num 要打印的数值
-     * @param field_width 区域宽度
-     * @param precision 精度
-     * @param flags 标志位
-     */
-
-    char pad, sign, tmp_num_z[100], tmp_num_d[350];
-
-    const char *digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
-    // 显示小写字母
-    if (flags & SMALL)
-        digits = "0123456789abcdefghijklmnopqrstuvwxyz";
-
-    // 设置填充元素
-    pad = (flags & PAD_ZERO) ? '0' : ' ';
-    sign = 0;
-    if (flags & SIGN && num < 0)
-    {
-        sign = '-';
-        num = -num;
-    }
-    else
-    {
-        // 设置符号
-        sign = (flags & PLUS) ? '+' : ((flags & SPACE) ? ' ' : 0);
-    }
-
-    // sign占用了一个宽度
-    if (sign)
-        --field_width;
-
-    int js_num_z = 0, js_num_d = 0;                                                     // 临时数字字符串tmp_num_z tmp_num_d的长度
-    uint64_t num_z = (uint64_t)(num);                                                   // 获取整数部分
-    uint64_t num_decimal = (uint64_t)(round(1.0 * (num - num_z) * pow(10, precision))); // 获取小数部分
-
-    if (num == 0 || num_z == 0)
-        tmp_num_z[js_num_z++] = '0';
-    else
-    {
-        //存储整数部分
-        while (num_z > 0)
-        {
-            tmp_num_z[js_num_z++] = digits[num_z % 10]; // 注意这里，输出的数字，是小端对齐的。低位存低位
-            num_z /= 10;
-        }
-    }
-
-    while (num_decimal > 0)
-    {
-        tmp_num_d[js_num_d++] = digits[num_decimal % 10];
-        num_decimal /= 10;
-    }
-
-    field_width -= (precision + 1 + js_num_z);
-
-    // 靠右对齐
-    if (!(flags & LEFT))
-        while (field_width-- > 0)
-            *str++ = pad;
-
-    if (sign)
-        *str++ = sign;
-
-    // 输出整数部分
-    while (js_num_z > 0)
-    {
-        *str++ = tmp_num_z[js_num_z - 1];
-        --js_num_z;
-    }
-    *str++ = '.';
-
-    // 输出小数部分
-    int total_dec_count = js_num_d;
-    for (int i = 0; i < precision && js_num_d-- > 0; ++i)
-        *str++ = tmp_num_d[js_num_d];
-
-    while (total_dec_count < precision)
-    {
-        ++total_dec_count;
-        *str++ = '0';
-    }
-
-    while (field_width-- > 0)
-        *str++ = ' ';
-
-    return str;
-}
-
-/**
- * @brief 格式化打印字符串
- *
- * @param FRcolor 前景色
- * @param BKcolor 背景色
- * @param ... 格式化字符串
- */
-int printk_color(unsigned int FRcolor, unsigned int BKcolor, const char *fmt, ...)
-{
-    uint64_t rflags;
-    io_mfence();
-    spin_lock_irqsave(&__printk_lock, rflags);
-    io_mfence();
-    va_list args;
-    va_start(args, fmt);
-    static char buf[4096]; // vsprintf()的缓冲区
-    int len = vsprintf(buf, fmt, args);
-
-    va_end(args);
-    unsigned char current;
-
-    int i; // 总共输出的字符数
-    for (i = 0; i < len; ++i)
-    {
-        current = *(buf + i);
-        // 输出
-        rs_textui_putchar(current, FRcolor, BKcolor);
-    }
-    io_mfence();
-    spin_unlock_irqrestore(&__printk_lock, rflags);
-    io_mfence();
-    return i;
-}
-
-int sprintk(char *buf, const char *fmt, ...)
-{
-    int count = 0;
-    va_list args;
-
-    va_start(args, fmt);
-    count = vsprintf(buf, fmt, args);
-    va_end(args);
-
-    return count;
-}

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