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<ol class="chapter"><li class="chapter-item expanded affix "><a href="index.html">简明 zCore 教程</a></li><li class="chapter-item expanded affix "><a href="zcore-intro.html">🚧 zCore 整体结构和设计模式</a></li><li class="chapter-item expanded affix "><a href="fuchsia.html">🚧 Fuchsia OS 和 Zircon 微内核</a></li><li class="chapter-item expanded "><a href="ch01-00-object.html"><strong aria-hidden="true">1.</strong> 内核对象</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="ch01-01-kernel-object.html"><strong aria-hidden="true">1.1.</strong> ✅ 初识内核对象</a></li><li class="chapter-item expanded "><a href="ch01-02-process-object.html"><strong aria-hidden="true">1.2.</strong> 🚧 对象管理器：Process 对象</a></li><li class="chapter-item expanded "><a href="ch01-03-channel-object.html"><strong aria-hidden="true">1.3.</strong> 🚧 对象传送器：Channel 对象</a></li></ol></li><li class="chapter-item expanded "><a href="ch02-00-task.html"><strong aria-hidden="true">2.</strong> 任务管理</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="ch02-01-zircon-task.html"><strong aria-hidden="true">2.1.</strong> 🚧 Zircon 任务管理体系</a></li><li class="chapter-item expanded "><a href="ch02-02-process-job-object.html"><strong aria-hidden="true">2.2.</strong> 🚧 进程管理：Process 与 Job 对象</a></li><li class="chapter-item expanded "><a href="ch02-03-thread-object.html"><strong aria-hidden="true">2.3.</strong> 🚧 线程管理：Thread 对象</a></li></ol></li><li class="chapter-item expanded "><a href="ch03-00-memory.html"><strong aria-hidden="true">3.</strong> 内存管理</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="ch03-01-zircon-memory.html"><strong aria-hidden="true">3.1.</strong> 🚧 Zircon 内存管理模型</a></li><li class="chapter-item expanded "><a href="ch03-02-vmo.html"><strong aria-hidden="true">3.2.</strong> 🚧 物理内存：VMO 对象</a></li><li class="chapter-item expanded "><a href="ch03-03-vmo-paged.html"><strong aria-hidden="true">3.3.</strong> 🚧 物理内存：按页分配的 VMO</a></li><li class="chapter-item expanded "><a href="ch03-04-vmar.html"><strong aria-hidden="true">3.4.</strong> 🚧 虚拟内存：VMAR 对象</a></li></ol></li><li class="chapter-item expanded "><a href="ch04-00-userspace.html"><strong aria-hidden="true">4.</strong> 用户程序</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="ch04-01-user-program.html"><strong aria-hidden="true">4.1.</strong> 🚧 Zircon 用户程序</a></li><li class="chapter-item expanded "><a href="ch04-02-context-switch.html" class="active"><strong aria-hidden="true">4.2.</strong> 🚧 上下文切换</a></li><li class="chapter-item expanded "><a href="ch04-03-syscall.html"><strong aria-hidden="true">4.3.</strong> 🚧 系统调用</a></li></ol></li><li class="chapter-item expanded "><a href="ch05-00-signal-and-waiting.html"><strong aria-hidden="true">5.</strong> 信号和等待</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="ch05-01-wait-signal.html"><strong aria-hidden="true">5.1.</strong> 🚧 等待内核对象的信号</a></li><li class="chapter-item expanded "><a href="ch05-02-port-object.html"><strong aria-hidden="true">5.2.</strong> 🚧 同时等待多个信号：Port 对象</a></li><li class="chapter-item expanded "><a href="ch05-03-more-signal-objects.html"><strong aria-hidden="true">5.3.</strong> 🚧 实现更多：EventPair, Timer 对象</a></li><li class="chapter-item expanded "><a href="ch05-04-futex-object.html"><strong aria-hidden="true">5.4.</strong> 🚧 用户态同步互斥：Futex 对象</a></li></ol></li><li class="chapter-item expanded "><a href="ch06-00-hal.html"><strong aria-hidden="true">6.</strong> 硬件抽象层</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="ch06-01-zcore-hal-unix.html"><strong aria-hidden="true">6.1.</strong> ✅ UNIX硬件抽象层</a></li></ol></li></ol> </div>
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<main>
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<h1 id="上下文切换"><a class="header" href="#上下文切换">上下文切换</a></h1>
|
|
|
<blockquote>
|
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|
<p>本节介绍 trapframe-rs 中 <a href="https://github.com/rcore-os/trapframe-rs/blob/master/src/arch/x86_64/fncall.rs">fncall.rs</a> 的魔法实现</p>
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</blockquote>
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<h2 id="保存和恢复通用寄存器"><a class="header" href="#保存和恢复通用寄存器">保存和恢复通用寄存器</a></h2>
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<blockquote>
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|
<p>定义 UserContext 结构体</p>
|
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|
</blockquote>
|
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|
<pre><pre class="playground"><code class="language-rust edition2018">
|
|
|
<span class="boring">#![allow(unused)]
|
|
|
</span><span class="boring">fn main() {
|
|
|
</span>pub struct UserContext {
|
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|
pub general: GeneralRegs,
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|
pub trap_num: usize,
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pub error_code: usize,
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|
}
|
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<span class="boring">}
|
|
|
</span></code></pre></pre>
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<pre><pre class="playground"><code class="language-rust edition2018">
|
|
|
<span class="boring">#![allow(unused)]
|
|
|
</span><span class="boring">fn main() {
|
|
|
</span>pub struct GeneralRegs {
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|
pub rax: usize,
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pub rbx: usize,
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|
pub rcx: usize,
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|
|
pub rdx: usize,
|
|
|
pub rsi: usize,
|
|
|
pub rdi: usize,
|
|
|
pub rbp: usize,
|
|
|
pub rsp: usize,
|
|
|
pub r8: usize,
|
|
|
pub r9: usize,
|
|
|
pub r10: usize,
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|
|
pub r11: usize,
|
|
|
pub r12: usize,
|
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|
pub r13: usize,
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|
|
pub r14: usize,
|
|
|
pub r15: usize,
|
|
|
pub rip: usize,
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|
|
pub rflags: usize,
|
|
|
pub fsbase: usize,
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|
|
pub gsbase: usize,
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|
|
}
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|
|
<span class="boring">}
|
|
|
</span></code></pre></pre>
|
|
|
<p><code>Usercontext</code>保存了用户执行的上下文，包括跳转到用户态之后程序的第一条指令的地址，如果程序首次从内核态进入用户态执行，则rip指向用户进程的第一条指令的地址。</p>
|
|
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<blockquote>
|
|
|
<p>保存 callee-saved 寄存器到栈上，恢复 UserContext 寄存器，进入用户态，反之亦然</p>
|
|
|
</blockquote>
|
|
|
<pre><pre class="playground"><code class="language-rust edition2018">
|
|
|
<span class="boring">#![allow(unused)]
|
|
|
</span><span class="boring">fn main() {
|
|
|
</span>syscall_fn_return:
|
|
|
<span class="boring"> save callee-saved registers
|
|
|
</span> push r15
|
|
|
push r14
|
|
|
push r13
|
|
|
push r12
|
|
|
push rbp
|
|
|
push rbx
|
|
|
|
|
|
push rdi
|
|
|
SAVE_KERNEL_STACK
|
|
|
mov rsp, rdi
|
|
|
|
|
|
POP_USER_FSBASE
|
|
|
|
|
|
<span class="boring"> pop trap frame (struct GeneralRegs)
|
|
|
</span> pop rax
|
|
|
pop rbx
|
|
|
pop rcx
|
|
|
pop rdx
|
|
|
pop rsi
|
|
|
pop rdi
|
|
|
pop rbp
|
|
|
pop r8 # skip rsp
|
|
|
pop r8
|
|
|
pop r9
|
|
|
pop r10
|
|
|
pop r11
|
|
|
pop r12
|
|
|
pop r13
|
|
|
pop r14
|
|
|
pop r15
|
|
|
pop r11 # r11 = rip. FIXME: don't overwrite r11!
|
|
|
popfq # pop rflags
|
|
|
mov rsp, [rsp - 8*11] # restore rsp
|
|
|
jmp r11 # restore rip
|
|
|
<span class="boring">}
|
|
|
</span></code></pre></pre>
|
|
|
<p>弹出的寄存器恰好对应了GeneralRegs的结构，通过在rust的unsafe代码块中调用<code>syscall_fn_return</code>函数，并且传递<code>Usercontext</code>结构体的指针到rdi中，可以创造出程序进入用户态的运行环境。</p>
|
|
|
<h2 id="找回内核上下文线程局部存储-与-fs-寄存器"><a class="header" href="#找回内核上下文线程局部存储-与-fs-寄存器">找回内核上下文：线程局部存储 与 FS 寄存器</a></h2>
|
|
|
<blockquote>
|
|
|
<p>在用户程序跳转回内核代码的那一刻，如何在不破坏用户寄存器的情况下切换回内核栈？</p>
|
|
|
<p>进入用户态前，将内核栈指针保存在内核 glibc 的 TLS 区域中。为此我们需要查看 glibc 源码，找到一个空闲位置。</p>
|
|
|
<p>Linux 和 macOS 下如何分别通过系统调用设置 fsbase / gsbase</p>
|
|
|
</blockquote>
|
|
|
<h2 id="测试"><a class="header" href="#测试">测试</a></h2>
|
|
|
<blockquote>
|
|
|
<p>编写单元测试验证上述过程</p>
|
|
|
</blockquote>
|
|
|
<pre><pre class="playground"><code class="language-rust edition2018">
|
|
|
<span class="boring">#![allow(unused)]
|
|
|
</span><span class="boring">fn main() {
|
|
|
</span>#[cfg(test)]
|
|
|
mod tests {
|
|
|
use crate::*;
|
|
|
|
|
|
#[cfg(target_os = "macos")]
|
|
|
global_asm!(".set _dump_registers, dump_registers");
|
|
|
|
|
|
// Mock user program to dump registers at stack.
|
|
|
global_asm!(
|
|
|
r#"
|
|
|
dump_registers:
|
|
|
push r15
|
|
|
push r14
|
|
|
push r13
|
|
|
push r12
|
|
|
push r11
|
|
|
push r10
|
|
|
push r9
|
|
|
push r8
|
|
|
push rsp
|
|
|
push rbp
|
|
|
push rdi
|
|
|
push rsi
|
|
|
push rdx
|
|
|
push rcx
|
|
|
push rbx
|
|
|
push rax
|
|
|
|
|
|
add rax, 10
|
|
|
add rbx, 10
|
|
|
add rcx, 10
|
|
|
add rdx, 10
|
|
|
add rsi, 10
|
|
|
add rdi, 10
|
|
|
add rbp, 10
|
|
|
add r8, 10
|
|
|
add r9, 10
|
|
|
add r10, 10
|
|
|
add r11, 10
|
|
|
add r12, 10
|
|
|
add r13, 10
|
|
|
add r14, 10
|
|
|
add r15, 10
|
|
|
|
|
|
call syscall_fn_entry
|
|
|
"#
|
|
|
);
|
|
|
|
|
|
#[test]
|
|
|
fn run_fncall() {
|
|
|
extern "sysv64" {
|
|
|
fn dump_registers();
|
|
|
}
|
|
|
let mut stack = [0u8; 0x1000];
|
|
|
let mut cx = UserContext {
|
|
|
general: GeneralRegs {
|
|
|
rax: 0,
|
|
|
rbx: 1,
|
|
|
rcx: 2,
|
|
|
rdx: 3,
|
|
|
rsi: 4,
|
|
|
rdi: 5,
|
|
|
rbp: 6,
|
|
|
rsp: stack.as_mut_ptr() as usize + 0x1000,
|
|
|
r8: 8,
|
|
|
r9: 9,
|
|
|
r10: 10,
|
|
|
r11: 11,
|
|
|
r12: 12,
|
|
|
r13: 13,
|
|
|
r14: 14,
|
|
|
r15: 15,
|
|
|
rip: dump_registers as usize,
|
|
|
rflags: 0,
|
|
|
fsbase: 0, // don't set to non-zero garbage value
|
|
|
gsbase: 0,
|
|
|
},
|
|
|
trap_num: 0,
|
|
|
error_code: 0,
|
|
|
};
|
|
|
cx.run_fncall();
|
|
|
// check restored registers
|
|
|
let general = unsafe { *(cx.general.rsp as *const GeneralRegs) };
|
|
|
assert_eq!(
|
|
|
general,
|
|
|
GeneralRegs {
|
|
|
rax: 0,
|
|
|
rbx: 1,
|
|
|
rcx: 2,
|
|
|
rdx: 3,
|
|
|
rsi: 4,
|
|
|
rdi: 5,
|
|
|
rbp: 6,
|
|
|
// skip rsp
|
|
|
r8: 8,
|
|
|
r9: 9,
|
|
|
r10: 10,
|
|
|
// skip r11
|
|
|
r12: 12,
|
|
|
r13: 13,
|
|
|
r14: 14,
|
|
|
r15: 15,
|
|
|
..general
|
|
|
}
|
|
|
);
|
|
|
// check saved registers
|
|
|
assert_eq!(
|
|
|
cx.general,
|
|
|
GeneralRegs {
|
|
|
rax: 10,
|
|
|
rbx: 11,
|
|
|
rcx: 12,
|
|
|
rdx: 13,
|
|
|
rsi: 14,
|
|
|
rdi: 15,
|
|
|
rbp: 16,
|
|
|
// skip rsp
|
|
|
r8: 18,
|
|
|
r9: 19,
|
|
|
r10: 20,
|
|
|
// skip r11
|
|
|
r12: 22,
|
|
|
r13: 23,
|
|
|
r14: 24,
|
|
|
r15: 25,
|
|
|
..cx.general
|
|
|
}
|
|
|
);
|
|
|
assert_eq!(cx.trap_num, 0x100);
|
|
|
assert_eq!(cx.error_code, 0);
|
|
|
}
|
|
|
}
|
|
|
<span class="boring">}
|
|
|
</span></code></pre></pre>
|
|
|
<h2 id="macos-的麻烦动态二进制修改"><a class="header" href="#macos-的麻烦动态二进制修改">macOS 的麻烦：动态二进制修改</a></h2>
|
|
|
<blockquote>
|
|
|
<p>由于 macOS 用户程序无法修改 fs 寄存器，当运行相关指令时会访问非法内存地址触发段错误。</p>
|
|
|
<p>我们需要实现段错误信号处理函数，并在其中动态修改用户程序指令，将 fs 改为 gs。</p>
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