-
Notifications
You must be signed in to change notification settings - Fork 214
New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
Add basic support for ELF thread local storage segments #96
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
@vinaychandra Could you try whether this change works for you? |
Ah, it seems like I understood something wrong. I will create a new version. |
f4f73e8
to
fb926bc
Compare
With the new version, I can now successfully read the TLS template info for a small example: #[thread_local]
pub static mut DATA: u64 = 0;
#[thread_local]
pub static BSS: u64 = 0;
fn kernel_main(boot_info: &'static BootInfo) -> ! {
println!("Hello World{}", "!");
println!("TLS INFO: {:x?}", boot_info.tls_template());
// this panics because we did not set up the fs register yet
println!("DATA: {}, BSS: {}", unsafe { DATA }, BSS);
} The result is the following: I get the same values with
|
vinaychandra
approved these changes
Feb 19, 2020
Published as version 0.8.8 |
phil-opp
added a commit
that referenced
this pull request
Feb 25, 2020
vinaychandra
pushed a commit
to vinaychandra/bootloader
that referenced
this pull request
May 25, 2020
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This reports the thread local storage segment of the kernel (if present) in the boot information. This should make it possible to use the unstable
#[thread_local]
attribute. Since the TLS template overlaps with parts of a LOAD segment, no additional mapping needs to be done.Note that the TLS template should not be used directly. Instead, the kernel should create a copy the TLS template for each thread and then set up the
fs
register accordingly. See https://uclibc.org/docs/tls.pdf for more information.This code only works for a single TLS segment. If more than one TLS segment are present in the executable, the bootloader errors. We can of course lift this restriction if this becomes a problem in practice.
Fixes #95