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Syscall parameters (1)

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This commit is contained in:
Adrien Bourmault 2021-03-04 15:11:07 +01:00
parent 59318483f9
commit 999f41f3c2
Signed by: neox
GPG Key ID: 6EB408FE0ACEC664
2 changed files with 67 additions and 70 deletions
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70
kaleid/kernel/ke/isr.asm
View File

@ -27,10 +27,9 @@
%include "kaleid/kernel/ke/cpuf.inc"
global KeLoadIDT
extern _KeIdtPtr
extern _KeHandleISR
extern _KeSyscallHandler
extern syscallPreHandler
;;
;; Loads the IDT
@ -78,73 +77,6 @@ Die:
hlt
jmp Die
;;
;; System call pre-handler
;;
syscallPreHandler:
push r15
push r14
push r13
push r12
push r11
push r10
push r9
push r8
push rbp
push 0
push rsi
push rdx
push rcx
push rbx
push rax
mov rax, cr8
push rax
mov rax, cr4
push rax
mov rax, cr3
push rax
mov rax, cr2
push rax
mov rax, cr0
push rax
mov rcx, 0xC0000080
rdmsr
push rax
; Call the C routine to dispatch interrupts
cld ; DF must be cleared by the caller
mov rsi, rsp ; First argument points to the processor state
mov rbp, 0 ; Terminate stack traces here
call _KeSyscallHandler
; pop the control registers
add rsp, 48
; pop registers except return value
pop rbx
pop rbx ; 2x rbx to discard rax
pop rcx
pop rdx
pop rsi
pop rdi
pop rbp
pop r8
pop r9
pop r10
pop r11
pop r12
pop r13
pop r14
pop r15
; pop the error code and interrupt id
add rsp, 16
iretq
Die2:
hlt
jmp Die
;; Divide Error Fault
IsrWithoutErrCode 0

67
kaleid/kernel/ke/syscall.asm
View File

@ -28,7 +28,72 @@
global KeJumpToUserspace
global KeSyscall
extern KernLog
global syscallPreHandler
extern _KeSyscallHandler
;;
;; System call pre-handler
;;
syscallPreHandler:
push r15
push r14
push r13
push r12
push r11
push 0
push r9
push r8
push rbp
push 0
push 0
push 0
push rcx
push rbx
push rax
mov rax, cr8
push rax
mov rax, cr4
push rax
mov rax, cr3
push rax
mov rax, cr2
push rax
mov rax, cr0
push rax
mov rcx, 0xC0000080
rdmsr
push rax
; Call the C routine to dispatch interrupts
cld ; DF must be cleared by the caller
mov rsi, rsp ; First argument points to the processor state
mov rbp, 0 ; Terminate stack traces here
call _KeSyscallHandler
; pop the control registers
add rsp, 48
; pop registers except return value
pop rbx
pop rbx ; 2x rbx to discard rax
pop rcx
pop rdx
pop rsi
pop rdi
pop rbp
pop r8
pop r9
pop r10
pop r11
pop r12
pop r13
pop r14
pop r15
; pop the error code and interrupt id
add rsp, 16
iretq
;;
;; To get ring3 code running