8000 avoid 32-bit relocation to __BOOTLOADER_CONFIG by Freax13 · Pull Request #428 · rust-osdev/bootloader · GitHub
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avoid 32-bit relocation to __BOOTLOADER_CONFIG #428

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Merged
merged 3 commits into from
Mar 14, 2024
Merged

avoid 32-bit relocation to __BOOTLOADER_CONFIG #428

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6652010
avoid 32-bit relocation to __BOOTLOADER_CONFIG
Freax13 Feb 21, 2024
b785b6d
add another level of indirection
Freax13 Feb 23, 2024
d0d10fe
don't call slice::as_ptr
Freax13 Mar 7, 2024
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add another level of indirection 
This prevents the compiler from optimzing out __BOOTLOADER_CONFIG_REF
in favor of accessing __BOOTLOADER_CONFIG directly.
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@Freax13
Freax13 committed Feb 23, 2024
commit b785b6d4f059c5b08a7a1a9cfa95a5ffaa35af9d
4 changes: 2 additions & 2 deletions api/src/lib.rs
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Expand Up @@ -130,7 +130,7 @@ macro_rules! entry_point {
let f: fn(&'static mut $crate::BootInfo) -> ! = $path;

// ensure that the config is used so that the linker keeps it
$crate::__force_use(__BOOTLOADER_CONFIG_REF);
$crate::__force_use(&__BOOTLOADER_CONFIG_REF);

f(boot_info)
}
Expand All @@ -139,7 +139,7 @@ macro_rules! entry_point {
}

#[doc(hidden)]
pub fn __force_use(slice: &[u8]) {
pub fn __force_use(slice: &&[u8; BootloaderConfig::SERIALIZED_LEN]) {
let force_use = slice.as_ptr() as usize;
unsafe { core::arch::asm!("add {0}, 0", in(reg) force_use, options(nomem, nostack)) };
}
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