第四章：地址空间 · rCore 2024S 随记
Planted May 11, 2024
- 唉。他妈的排课，都没什么时间做 rCore 了。我现在学校的课程从早 8 排到晚 22。简直是高中。
前言
实际实践参考的文档：rCore Tutorial Guide 2024S。
拥有更为详细细节介绍的 rCore OS 官方文档：rCore-Tutorial-Book-v3。
第四章：地址空间
引言
试着运行本章代码。
$ git checkout ch4
Already on 'ch4'
Your branch is up to date with 'origin/ch4'.
~/2024s-rcore-255doesnotexist$ cd os
~/2024s-rcore-255doesnotexist/os$ make run
(rustup target list | grep "riscv64gc-unknown-none-elf (installed)") || rustup target add riscv64gc-unknown-none-elf
riscv64gc-unknown-none-elf (installed)
cargo install cargo-binutils
Updating crates.io index
Ignored package `cargo-binutils v0.3.6` is already installed, use --force to override
rustup component add rust-src
info: component 'rust-src' is up to date
rustup component add llvm-tools-preview
info: component 'llvm-tools' for target 'x86_64-unknown-linux-gnu' is up to date
make[1]: Entering directory '/home/ezra/2024s-rcore-255doesnotexist/user'
Removed 1342 files, 15.6MiB total
target/riscv64gc-unknown-none-elf/release/ch2b_bad_address target/riscv64gc-unknown-none-elf/release/ch2b_bad_instructions target/riscv64gc-unknown-none-elf/release/ch2b_bad_register target/riscv64gc-unknown-none-elf/release/ch2b_hello_world target/riscv64gc-unknown-none-elf/release/ch2b_power_3 target/riscv64gc-unknown-none-elf/release/ch2b_power_5 target/riscv64gc-unknown-none-elf/release/ch2b_power_7 target/riscv64gc-unknown-none-elf/release/ch3b_yield0 target/riscv64gc-unknown-none-elf/release/ch3b_yield1 target/riscv64gc-unknown-none-elf/release/ch3b_yield2 target/riscv64gc-unknown-none-elf/release/ch4b_sbrk
Compiling scopeguard v1.2.0
Compiling spin v0.5.2
Compiling spin v0.7.1
Compiling bitflags v1.3.2
Compiling lock_api v0.4.6
Compiling lazy_static v1.4.0
Compiling buddy_system_allocator v0.6.0
Compiling spin v0.9.8
Compiling user_lib v0.1.0 (/home/ezra/2024s-rcore-255doesnotexist/user)
warning: creating a mutable reference to mutable static is discouraged
--> src/bin/ch8b_race_adder.rs:18:17
|
18 | let a = &mut A as *mut usize;
| ^^^^^^ mutable reference to mutable static
|
= note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
= note: this will be a hard error in the 2024 edition
= note: this mutable reference has lifetime `'static`, but if the static gets accessed (read or written) by any other means, or any other reference is created, then any further use of this mutable reference is Undefined Behavior
= note: `#[warn(static_mut_refs)]` on by default
help: use `addr_of_mut!` instead to create a raw pointer
|
18 | let a = addr_of_mut!(A) as *mut usize;
| ~~~~~~~~~~~~~~~
warning: unused import: `get_time`
--> src/bin/ch7b_pipe_large_test.rs:10:29
|
10 | use user_lib::{close, fork, get_time, pipe, read, wait, write,getpid};
| ^^^^^^^^
|
= note: `#[warn(unused_imports)]` on by default
warning: creating a mutable reference to mutable static is discouraged
--> src/bin/ch8b_race_adder_atomic.rs:26:17
|
26 | let a = &mut A as *mut usize;
| ^^^^^^ mutable reference to mutable static
|
= note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
= note: this will be a hard error in the 2024 edition
= note: this mutable reference has lifetime `'static`, but if the static gets accessed (read or written) by any other means, or any other reference is created, then any further use of this mutable reference is Undefined Behavior
= note: `#[warn(static_mut_refs)]` on by default
help: use `addr_of_mut!` instead to create a raw pointer
|
26 | let a = addr_of_mut!(A) as *mut usize;
| ~~~~~~~~~~~~~~~
warning: `user_lib` (bin "ch8b_race_adder") generated 1 warning
warning: creating a mutable reference to mutable static is discouraged
--> src/bin/ch8b_race_adder_mutex_spin.rs:20:17
|
20 | let a = &mut A as *mut usize;
| ^^^^^^ mutable reference to mutable static
|
= note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
= note: this will be a hard error in the 2024 edition
= note: this mutable reference has lifetime `'static`, but if the static gets accessed (read or written) by any other means, or any other reference is created, then any further use of this mutable reference is Undefined Behavior
= note: `#[warn(static_mut_refs)]` on by default
help: use `addr_of_mut!` instead to create a raw pointer
|
20 | let a = addr_of_mut!(A) as *mut usize;
| ~~~~~~~~~~~~~~~
warning: Rust ABI is unsupported in naked functions
--> src/bin/ch8b_stackful_coroutine.rs:259:1
|
259 | unsafe fn switch(old: *mut TaskContext, new: *const TaskContext) {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: `#[warn(undefined_naked_function_abi)]` on by default
warning: creating a mutable reference to mutable static is discouraged
--> src/bin/ch8b_race_adder_loop.rs:24:17
|
24 | let a = &mut A as *mut usize;
| ^^^^^^ mutable reference to mutable static
|
= note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
= note: this will be a hard error in the 2024 edition
= note: this mutable reference has lifetime `'static`, but if the static gets accessed (read or written) by any other means, or any other reference is created, then any further use of this mutable reference is Undefined Behavior
= note: `#[warn(static_mut_refs)]` on by default
help: use `addr_of_mut!` instead to create a raw pointer
|
24 | let a = addr_of_mut!(A) as *mut usize;
| ~~~~~~~~~~~~~~~
warning: field `id` is never read
--> src/bin/ch8b_stackful_coroutine.rs:36:5
|
35 | struct Task {
| ---- field in this struct
36 | id: usize,
| ^^
|
= note: `#[warn(dead_code)]` on by default
warning: `user_lib` (bin "ch8b_race_adder_atomic") generated 1 warning
warning: `user_lib` (bin "ch7b_pipe_large_test") generated 1 warning (run `cargo fix --bin "ch7b_pipe_large_test"` to apply 1 suggestion)
warning: `user_lib` (bin "ch8b_race_adder_mutex_spin") generated 1 warning
warning: `user_lib` (bin "ch8b_stackful_coroutine") generated 2 warnings
warning: `user_lib` (bin "ch8b_race_adder_loop") generated 1 warning
Finished `release` profile [optimized] target(s) in 2.28s
make[1]: Leaving directory '/home/ezra/2024s-rcore-255doesnotexist/user'
Platform: qemu
Compiling os v0.1.0 (/home/ezra/2024s-rcore-255doesnotexist/os)
Compiling zero v0.1.3
Compiling xmas-elf v0.7.0
Finished `release` profile [optimized] target(s) in 1.25s
[rustsbi] RustSBI version 0.3.0-alpha.2, adapting to RISC-V SBI v1.0.0
.______ __ __ _______.___________. _______..______ __
| _ \ | | | | / | | / || _ \ | |
| |_) | | | | | | (----`---| |----`| (----`| |_) || |
| / | | | | \ \ | | \ \ | _ < | |
| |\ \----.| `--' |.----) | | | .----) | | |_) || |
| _| `._____| \______/ |_______/ |__| |_______/ |______/ |__|
[rustsbi] Implementation : RustSBI-QEMU Version 0.2.0-alpha.2
[rustsbi] Platform Name : riscv-virtio,qemu
[rustsbi] Platform SMP : 1
[rustsbi] Platform Memory : 0x80000000..0x88000000
[rustsbi] Boot HART : 0
[rustsbi] Device Tree Region : 0x87000000..0x87000ef2
[rustsbi] Firmware Address : 0x80000000
[rustsbi] Supervisor Address : 0x80200000
[rustsbi] pmp01: 0x00000000..0x80000000 (-wr)
[rustsbi] pmp02: 0x80000000..0x80200000 (---)
[rustsbi] pmp03: 0x80200000..0x88000000 (xwr)
[rustsbi] pmp04: 0x88000000..0x00000000 (-wr)
[kernel] Hello, world!
[kernel] back to world!
remap_test passed!
init TASK_MANAGER
num_app = 11
[kernel] PageFault in application, bad addr = 0x0, bad instruction = 0x3ac, kernel killed it.
[kernel] IllegalInstruction in application, kernel killed it.
[kernel] IllegalInstruction in application, kernel killed it.
Hello, world from user mode program!
power_3 [10000/200000]
power_3 [20000/200000]
power_3 [30000/200000]
power_3 [40000/200000]
power_3 [50000/200000]
power_5 [10000/140000]
power_5 [20000/140000]
power_5 [30000/140000]
power_5 [40000/140000]
power_5 [50000/140000]
power_5 [60000/140000]
power_5 [70000/140000]
power_5 [80000/140000]
power_5 [90000/140000]
power_5 [100000/140000]
power_5 [110000/140000]
power_5 [120000/140000]
power_5 [130000/140000]
power_5 [140000/140000]
5^140000 = 386471875(MOD 998244353)
Test power_5 OK!
power_7 [10000/160000]
power_7 [20000/160000]
power_7 [30000/160000]
power_7 [40000/160000]
AAAAAAAAAA [1/5]
BBBBBBBBBB [1/5]
CCCCCCCCCC [1/5]
Test sbrk start.
origin break point = c000
one page allocated, break point = d000
try write to allocated page
write ok
10 page allocated, break point = 17000
11 page DEALLOCATED, break point = c000
try DEALLOCATED more one page, should be failed.
Test sbrk almost OK!
now write to deallocated page, should cause page fault.
[kernel] PageFault in application, bad addr = 0xc000, bad instruction = 0x5c8, kernel killed it.
power_3 [60000/200000]
power_3 [70000/200000]
power_3 [80000/200000]
power_3 [90000/200000]
power_7 [50000/160000]
power_7 [60000/160000]
power_7 [70000/160000]
power_7 [80000/160000]
power_7 [90000/160000]
power_7 [100000/160000]
power_7 [110000/160000]
power_7 [120000/160000]
power_7 [130000/160000]
power_7 [140000/160000]
power_7 [150000/160000]
power_7 [160000/160000]
7^160000 = 667897727(MOD 998244353)
Test power_7 OK!
AAAAAAAAAA [2/5]
BBBBBBBBBB [2/5]
CCCCCCCCCC [2/5]
power_3 [100000/200000]
power_3 [110000/200000]
power_3 [120000/200000]
power_3 [130000/200000]
power_3 [140000/200000]
power_3 [150000/200000]
power_3 [160000/200000]
power_3 [170000/200000]
power_3 [180000/200000]
AAAAAAAAAA [3/5]
BBBBBBBBBB [3/5]
CCCCCCCCCC [3/5]
power_3 [190000/200000]
power_3 [200000/200000]
3^200000 = 871008973(MOD 998244353)
Test power_3 OK!
AAAAAAAAAA [4/5]
BBBBBBBBBB [4/5]
CCCCCCCCCC [4/5]
AAAAAAAAAA [5/5]
BBBBBBBBBB [5/5]
CCCCCCCCCC [5/5]
Test write A OK!
Test write B OK!
Test write C OK!
[kernel] Panicked at src/task/mod.rs:153 All applications completed!