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signal的发送（暂时父子进程之间共享信号及相应的结构体） (#89)
* 解决由于spinlock.h中包含preempt_enable()带来的循环include问题 * new: 初步实现signal的数据结构 * new:signal相关数据结构 * fix: 解决bindings.rs报一堆警告的问题 * new: rust下的kdebug kinfo kwarn kBUG kerror宏 * 移动asm.h和cmpxchg.h * new: signal的发送（暂时只支持父子进程共享信号及处理函数）
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#pragma once
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#include <stdint.h>
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#define sti() __asm__ __volatile__("sti\n\t" :: \
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: "memory") //开启外部中断
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#define cli() __asm__ __volatile__("cli\n\t" :: \
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: "memory") //关闭外部中断
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#define nop() __asm__ __volatile__("nop\n\t")
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#define hlt() __asm__ __volatile__("hlt\n\t")
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#define pause() asm volatile("pause\n\t"); // 处理器等待一段时间
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//内存屏障
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#define io_mfence() __asm__ __volatile__("mfence\n\t" :: \
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: "memory") // 在mfence指令前的读写操作必须在mfence指令后的读写操作前完成。
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#define io_sfence() __asm__ __volatile__("sfence\n\t" :: \
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: "memory") // 在sfence指令前的写操作必须在sfence指令后的写操作前完成
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#define io_lfence() __asm__ __volatile__("lfence\n\t" :: \
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: "memory") // 在lfence指令前的读操作必须在lfence指令后的读操作前完成。
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/*
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* Macros to generate condition code outputs from inline assembly,
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* The output operand must be type "bool".
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*/
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// 如果编译器支持输出标志寄存器值到变量的话，则会定义__GCC_ASM_FLAG_OUTPUTS__
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#ifdef __GCC_ASM_FLAG_OUTPUTS__
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// CC_SET(c)则是用于设置标志寄存器中的某一位
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#define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
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// "=@cccond"的用法是，将标志寄存器中的cond（也就是指令集定义的标准条件）的值输出到变量中
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#define CC_OUT(c) "=@cc" #c
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#else
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#define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n"
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#define CC_OUT(c) [_cc_##c] "=qm"
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#endif
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#define rdtsc() ({ \
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uint64_t tmp1 = 0, tmp2 = 0; \
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asm volatile("rdtsc" \
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: "=d"(tmp1), "=a"(tmp2)::"memory"); \
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(tmp1 << 32 | tmp2); \
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})
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/**
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* @brief 读取rsp寄存器的值（存储了页目录的基地址）
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*
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* @return unsigned* rsp的值的指针
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*/
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unsigned long *get_rsp()
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{
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uint64_t *tmp;
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__asm__ __volatile__(
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"movq %%rsp, %0\n\t"
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: "=r"(tmp)::"memory");
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return tmp;
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}
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/**
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* @brief 读取rbp寄存器的值（存储了页目录的基地址）
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*
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* @return unsigned* rbp的值的指针
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*/
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unsigned long *get_rbp()
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{
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uint64_t *tmp;
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__asm__ __volatile__(
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"movq %%rbp, %0\n\t"
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: "=r"(tmp)::"memory");
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return tmp;
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}
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/**
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* @brief 读取ds寄存器的值（存储了页目录的基地址）
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*
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* @return unsigned* ds的值的指针
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*/
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unsigned long *get_ds()
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{
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uint64_t *tmp;
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__asm__ __volatile__(
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"movq %%ds, %0\n\t"
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: "=r"(tmp)::"memory");
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return tmp;
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}
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/**
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* @brief 读取rax寄存器的值（存储了页目录的基地址）
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*
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* @return unsigned* rax的值的指针
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*/
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unsigned long *get_rax()
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{
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uint64_t *tmp;
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__asm__ __volatile__(
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"movq %%rax, %0\n\t"
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: "=r"(tmp)::"memory");
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return tmp;
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}
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/**
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* @brief 读取rbx寄存器的值（存储了页目录的基地址）
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*
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* @return unsigned* rbx的值的指针
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*/
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unsigned long *get_rbx()
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{
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uint64_t *tmp;
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__asm__ __volatile__(
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"movq %%rbx, %0\n\t"
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: "=r"(tmp)::"memory");
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return tmp;
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}
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// ========= MSR寄存器组操作 =============
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/**
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* @brief 向msr寄存器组的address处的寄存器写入值value
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*
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* @param address 地址
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* @param value 要写入的值
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*/
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void wrmsr(uint64_t address, uint64_t value)
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{
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__asm__ __volatile__("wrmsr \n\t" ::"d"(value >> 32), "a"(value & 0xffffffff), "c"(address)
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: "memory");
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}
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/**
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* @brief 从msr寄存器组的address地址处读取值
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* rdmsr返回高32bits在edx，低32bits在eax
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* @param address 地址
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* @return uint64_t address处的寄存器的值
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*/
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uint64_t rdmsr(uint64_t address)
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{
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unsigned int tmp0, tmp1;
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__asm__ __volatile__("rdmsr \n\t"
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: "=d"(tmp0), "=a"(tmp1)
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: "c"(address)
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: "memory");
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return ((uint64_t)tmp0 << 32) | tmp1;
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}
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uint64_t get_rflags()
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{
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unsigned long tmp = 0;
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__asm__ __volatile__("pushfq \n\t"
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"movq (%%rsp), %0 \n\t"
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"popfq \n\t"
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: "=r"(tmp)::"memory");
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return tmp;
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}
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#pragma once
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#include <common/compiler.h>
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#include <arch/x86_64/asm/asm.h>
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/**
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* @brief 通过extern不存在的函数，来让编译器报错。以防止不符合要求的代码的产生。
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*/
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extern void __cmpxchg_wrong_size(void) __compiletime_error("Bad argument size for cmpxchg");
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// 定义常量：操作符涉及到的字节数
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#define __X86_CASE_B 1
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#define __X86_CASE_W 2
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#define __X86_CASE_L 4
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#define __X86_CASE_Q 8
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/**
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* @brief lock cmpxchg指令的包装。
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* 将_ptr指向的值与old_ptr指向的值做比较，如果相等，则将_new指向的值，加载到_ptr指向的值中。
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*/
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#define __raw_try_cmpxchg(_ptr, _old_ptr, _new, size) \
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({ \
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bool is_success = false; \
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typeof(_ptr) _old = (typeof(_ptr))(_old_ptr); \
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typeof(*(_ptr)) __old = *_old; \
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typeof(*(_ptr)) __new = (_new); \
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switch (size) \
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{ \
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case __X86_CASE_B: \
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{ \
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volatile uint8_t *__ptr = (volatile uint8_t *)(_ptr); \
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asm volatile("lock cmpxchgb %[new], %[ptr]\n\t" \
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: CC_OUT(z)(is_success), \
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[ptr] "+m"(*__ptr), \
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[old] "+a"(__old) \
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: [new] "q"(__new) \
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: "memory"); \
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break; \
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} \
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case __X86_CASE_W: \
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{ \
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volatile uint16_t *__ptr = (volatile uint16_t *)(_ptr); \
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asm volatile("lock cmpxchgw %[new], %[ptr]\n\t" \
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: CC_OUT(z)(is_success), \
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[ptr] "+m"(*__ptr), \
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[old] "+a"(__old) \
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: [new] "q"(__new) \
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: "memory"); \
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break; \
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} \
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case __X86_CASE_L: \
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{ \
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volatile uint32_t *__ptr = (volatile uint32_t *)(_ptr); \
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asm volatile("lock cmpxchgl %[new], %[ptr]\n\t" \
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: CC_OUT(z)(is_success), \
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[ptr] "+m"(*__ptr), \
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[old] "+a"(__old) \
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: [new] "q"(__new) \
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: "memory"); \
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break; \
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} \
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case __X86_CASE_Q: \
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{ \
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volatile uint64_t *__ptr = (volatile uint64_t *)(_ptr); \
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asm volatile("lock cmpxchgq %[new], %[ptr]\n\t" \
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: CC_OUT(z)(is_success), \
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[ptr] "+m"(*__ptr), \
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[old] "+a"(__old) \
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: [new] "q"(__new) \
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: "memory"); \
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break; \
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} \
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default: \
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__cmpxchg_wrong_size(); \
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} \
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if (unlikely(is_success == false)) \
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*_old = __old; \
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likely(is_success); \
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})
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#define arch_try_cmpxchg(ptr, old_ptr, new_ptr) \
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__raw_try_cmpxchg((ptr), (old_ptr), (new_ptr), sizeof(*ptr))
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18
kernel/src/arch/x86_64/asm/current.rs
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18
kernel/src/arch/x86_64/asm/current.rs
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use crate::include::bindings::bindings::process_control_block;
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use core::{arch::asm, sync::atomic::compiler_fence};
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/// @brief 获取指向当前进程的pcb的可变引用
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#[inline]
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pub fn current_pcb() -> &'static mut process_control_block {
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let ret: Option<&mut process_control_block>;
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unsafe {
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let mut tmp: u64 = !(32767u64);
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compiler_fence(core::sync::atomic::Ordering::SeqCst);
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asm!("and {0}, rsp", inout(reg)(tmp),);
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compiler_fence(core::sync::atomic::Ordering::SeqCst);
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ret = (tmp as *mut process_control_block).as_mut();
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}
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ret.unwrap()
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}
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24
kernel/src/arch/x86_64/asm/irqflags.rs
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24
kernel/src/arch/x86_64/asm/irqflags.rs
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use core::arch::asm;
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#[inline]
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pub fn local_irq_save(flags: &mut u64) {
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unsafe {
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asm!(
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"pushfq",
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"pop rax",
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"mov rax, {0}",
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"cli",
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out(reg)(*flags),
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);
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}
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}
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#[inline]
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pub fn local_irq_restore(flags: &u64) {
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let x = *flags;
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unsafe {
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asm!("push r15",
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"popfq", in("r15")(x));
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}
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}
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3
kernel/src/arch/x86_64/asm/mod.rs
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3
kernel/src/arch/x86_64/asm/mod.rs
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pub mod irqflags;
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#[macro_use]
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pub mod current;
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