christoph/lecture-operating-system-development
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This commit is contained in:
Christoph Urlacher
2022-07-16 01:03:30 +02:00
parent 6c0fff0b6c
commit b8d34e16dd
1 changed files with 6 additions and 4 deletions
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10
c_os/kernel/threads/Thread.asm Normal file → Executable file
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@ -19,6 +19,8 @@
[GLOBAL Thread_switch] [GLOBAL Thread_switch]
[GLOBAL Thread_start] [GLOBAL Thread_start]
; TODO: Add function to unlock the scheduler again so I can use the spinlock
; IMPLEMENTIERUNG DER FUNKTIONEN ; IMPLEMENTIERUNG DER FUNKTIONEN
[SECTION .text] [SECTION .text]
@ -94,7 +96,7 @@ Thread_switch:
;; SP --> EAX ;; SP --> EAX
;; == Low address == ;; == Low address ==
push eax ; backup eax before using it as index push eax ; backup eax before using it as index
mov eax, [esp + 0x8] mov eax, [esp + 0x8] ; + 0x8 because we pushed eax
add esp, 0x4 ; store the original esp add esp, 0x4 ; store the original esp
mov [eax + esp_offset], esp mov [eax + esp_offset], esp
@ -108,16 +110,16 @@ Thread_switch:
mov [eax + edx_offset], edx mov [eax + edx_offset], edx
pushf ; store eflags pushf ; store eflags
pop ebx pop ebx ; ebx has to be saved before
mov [eax + efl_offset], ebx mov [eax + efl_offset], ebx
pop ebx ; store eax pop ebx ; store eax
mov [eax + eax_offset], ebx mov [eax + eax_offset], ebx
;; Load next coroutine registers ============================================================ ;; Load next coroutine registers ============================================================
mov eax, [esp + 0x8] mov eax, [esp + 0x8] ; + 0x8 again since we popped eax value again
mov ebx, [eax + efl_offset] ; restore eflags mov ebx, [eax + efl_offset] ; restore eflags before restoring ebx
push ebx ; could be pushed directly from address but i didn't want to specify wordsize push ebx ; could be pushed directly from address but i didn't want to specify wordsize
popf popf