justin/jsix
1
1
Fork 0
mirror of https://github.com/justinian/jsix.git synced 2025-12-10 00:14:32 -08:00
Code Issues Packages Projects Releases Wiki Activity

Improve syscalls for new task switching

Browse Source 
There are a lot of under the hood changes here:
- Move syscalls to be a dispatch table, defined by syscalls.inc
- Don't need a full process state (push_all) in syscalls now
- In push_all, define REGS instead of using offsets
- Save TWO stack pointers as well as current saved stack pointer in TCB:
  - rsp0 is the base of the kernel stack for interrupts
  - rsp3 is the saved user stack from cpu_data
- Update syscall numbers in nulldrv
- Some asm-debugging enhancements to the gdb script
- fork() still not working
This commit is contained in:
Justin C. Miller
2019-04-02 00:25:36 -07:00
parent ca2362f858
commit 11a53e792f
17 changed files with 284 additions and 215 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
src/kernel/loader.s
View File

@@ -1,30 +1,22 @@
%include "push_all.inc"
extern load_process
extern load_process_image
global ramdisk_process_loader
ramdisk_process_loader:
; create_process already pushed a cpu_state onto the stack for us, this
; acts both as the cpu_state parameter to load_process, and the saved
; state for the following iretq
; acts both as the cpu_state parameter to load_process_image, and the
; saved state for the following iretq
pop rdi ; the address of the program image
pop rsi ; the size of the program image
pop rdx ; the address of this process' process structure
pop rcx ; the cpu_state
call load_process
call load_process_image
push rax ; load_process_image returns the process entrypoint
swapgs
xor rax, rax
mov ax, ss
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
pop_all
add rsp, 16 ; because the ISRs add err/num
iretq