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Understanding memory space and move higher the stack

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This commit is contained in:
Zhang Junyang
2024-03-13 13:56:04 +08:00
committed by Tate, Hongliang Tian
parent dede22843a
commit 52f07458f7
29 changed files with 155 additions and 125 deletions
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29
kernel/aster-nix/src/process/program_loader/elf/init_stack.rs
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@ -7,7 +7,7 @@
use core::mem;
use align_ext::AlignExt;
use aster_frame::vm::{VmIo, VmPerm};
use aster_frame::vm::{VmIo, VmPerm, MAX_USERSPACE_VADDR};
use aster_rights::{Full, Rights};
use super::{
@ -20,15 +20,16 @@ use crate::{
vm::{perms::VmPerms, vmar::Vmar, vmo::VmoOptions},
};
pub const INIT_STACK_BASE: Vaddr = 0x0000_0000_2000_0000;
pub const INIT_STACK_SIZE: usize = 0x1000 * 16; // 64KB
pub const INIT_STACK_SIZE: usize = 64 * 1024; // 64 KiB
/*
* The initial stack of a process looks like below(This figure is from occlum):
* Illustration of the virtual memory space containing the processes' init stack:
*
*
* +---------------------+ <------+ Top of stack
* | | (high address)
* (high address)
* +---------------------+ <------+ Highest address
* | | Random stack paddings
* +---------------------+ <------+ The base of stack (stack grows down)
* | |
* | Null-terminated |
* | strings referenced |
* | by variables below |
@ -62,8 +63,10 @@ pub const INIT_STACK_SIZE: usize = 0x1000 * 16; // 64KB
* +---------------------+
* | |
* | |
* + +
*
* +---------------------+
* | |
* +---------------------+ <------+ User stack default rlimit
* (low address)
*/
pub struct InitStack {
/// The high address of init stack
@ -93,9 +96,13 @@ impl InitStack {
}
}
/// This function only work for first process
pub fn new_default_config(argv: Vec<CString>, envp: Vec<CString>) -> Self {
let init_stack_top = INIT_STACK_BASE - PAGE_SIZE;
let nr_pages_padding = {
let mut random_nr_pages_padding: u8 = 0;
getrandom::getrandom(random_nr_pages_padding.as_bytes_mut()).unwrap();
random_nr_pages_padding as usize
};
let init_stack_top = MAX_USERSPACE_VADDR - PAGE_SIZE * nr_pages_padding;
let init_stack_size = INIT_STACK_SIZE;
InitStack::new(init_stack_top, init_stack_size, argv, envp)
}