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aarch64: usermode: Remove tpidr_el0 manipulation

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Was using the incorrect USER_TLS_OFFSET instead of USER_TCB_OFFSET. In
any case, this is better done in process::clone.
This commit is contained in:
Robin Randhawa
2021-01-17 10:05:10 +00:00
parent 3585f620b0
commit 67d72532a9
1 changed files with 0 additions and 2 deletions
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2
src/arch/aarch64/start.rs
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@@ -176,10 +176,8 @@ pub unsafe extern fn kstart_ap(args_ptr: *const KernelArgsAp) -> ! {
#[naked]
pub unsafe fn usermode(ip: usize, sp: usize, arg: usize, singlestep: bool) -> ! {
let cpu_id: usize = 0;
let uspace_tls_start = (crate::USER_TLS_OFFSET + crate::USER_TLS_SIZE * cpu_id);
let spsr: u32 = 0;
llvm_asm!("msr tpidr_el0, $0" : : "r"(uspace_tls_start) : : "volatile");
llvm_asm!("msr spsr_el1, $0" : : "r"(spsr) : : "volatile");
llvm_asm!("msr elr_el1, $0" : : "r"(ip) : : "volatile");
llvm_asm!("msr sp_el0, $0" : : "r"(sp) : : "volatile");