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Allow cloning of kernel threads. Userspace breaks potentially due to stack aliasing

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This commit is contained in:
Jeremy Soller 2016-09-13 20:06:39 -06:00
parent 4341a2d725
commit ce50faf7ca
6 changed files with 109 additions and 38 deletions
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5
arch/x86_64/src/start.rs
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@ -187,8 +187,7 @@ pub unsafe extern fn kstart_ap(cpu_id: usize, page_table: usize, stack_start: us
pub unsafe fn usermode(ip: usize, sp: usize) -> ! {
// Go to usermode
asm!("xchg bx, bx
mov ds, ax
asm!("mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
@ -201,7 +200,7 @@ pub unsafe fn usermode(ip: usize, sp: usize) -> ! {
: // No output because it never returns
: "{rax}"(gdt::GDT_USER_DATA << 3 | 3), // Stack segment
"{rbx}"(sp), // Stack pointer
"{rcx}"(3 << 12 | 1 << 9), // Flags - Set IOPL and interrupt enable flag
"{rcx}"(3 << 12/* | 1 << 9*/), // Flags - Set IOPL and interrupt enable flag
"{rdx}"(gdt::GDT_USER_CODE << 3 | 3), // Code segment
"{rsi}"(ip) // IP
: // No clobers because it never returns