syscalls

1 files changed, 256 insertions, 0 deletions

diff --git a/xxx/int_syscall_handler.asm b/xxx/int_syscall_handler.asm
new file mode 100644
index 0000000..4031f3d
--- /dev/null
+++ b/xxx/int_syscall_handler.asm
@@ -0,0 +1,256 @@
+global int_syscall_handler
+[extern task_fork]
+[extern task_exit]
+[extern task_wait]
+
+
+[extern syscall_exit]
+[extern syscall_write]
+[extern syscall_read]
+[extern syscall_readdir]
+[extern syscall_execve]
+[extern syscall_open]
+[extern syscall_close]
+[extern syscall_isatty]
+[extern syscall_lseek]
+[extern syscall_sbrk]
+[extern syscall_stat]
+[extern syscall_fork]
+[extern syscall_poll]
+[extern syscall_gettimeofday]
+[extern syscall_unhandled]
+
+[bits 32]
+
+pid: dd 0x0
+
+int_syscall_handler:
+
+cmp eax, 72
+je call_fork
+
+cmp eax, 60
+je call_exit
+
+cmp eax, 77
+je call_wait
+
+ cli
+
+    push ebx
+    push ecx
+    push edx
+
+    cmp eax, 61
+    je call_write
+
+    cmp eax, 62
+    je call_read
+
+    cmp eax, 63
+    je call_readdir
+
+    cmp eax, 64
+    je call_execve
+
+    cmp eax, 65
+    je call_open
+
+    cmp eax, 66
+    je call_close
+
+    cmp eax, 68
+    je call_isatty
+
+    cmp eax, 69
+    je call_lseek
+
+    cmp eax, 70
+    je call_sbrk
+
+    cmp eax, 71
+    je call_timeofday
+
+    cmp eax, 74
+    je call_stat
+
+    cmp eax, 67
+    je call_stat
+
+    cmp eax, 79
+    je call_stat
+
+    cmp eax, 80
+    je call_poll
+
+    push eax
+    jmp call_unhandled
+
+
+done:
+
+
+
+done_blocking:
+
+    pop ebx
+    pop ecx
+    pop edx
+
+    mov ebx,eax 
+
+    sti
+
+    iret           ;Interrupt-Return
+
+call_wait:
+
+    cli
+
+    pusha          ;Push all standard registers
+
+    mov ebx, esp	;save current stack pointer in esp
+    mov esp, 0x7000	;now put the stack outside of virtual memory in kernel space!
+
+    push ebx      ;Push pointer to all the stuff we just pushed
+
+    call task_wait ;Call C code
+
+    mov esp, eax   ;Replace the stack with what the C code gave us
+
+    popa           ;Put the standard registers back
+
+    sti
+
+    iretd           ;Interrupt-Return
+    ;;;;
+
+call_exit:
+
+    cli
+
+    pusha          ;Push all standard registers
+
+    mov ebx, esp	;save current stack pointer in esp
+    mov esp, 0x7000	;now put the stack outside of virtual memory in kernel space!
+
+    push ebx      ;Push pointer to all the stuff we just pushed
+
+    call task_exit ;Call C code
+
+    mov esp, eax   ;Replace the stack with what the C code gave us
+
+    popa           ;Put the standard registers back
+
+    sti
+
+    iretd           ;Interrupt-Return
+    ;;;;
+
+call_fork:
+    
+    pusha		;Push all standard registers
+
+    push ds
+    push es
+    push fs
+    push gs
+
+    mov ebx, esp     ; pass it in
+    push ebx
+    call task_fork ;Call C code
+    pop ebx
+
+    pop ds
+    pop es
+    pop fs
+    pop gs
+
+    mov [pid],eax    ; save return val, so it survives popa
+
+    popa           ;Put the standard registers back
+
+    mov ebx,[pid]
+
+    iretd           ;Interrupt-Return
+
+call_timeofday:
+    call syscall_gettimeofday
+    jmp done
+
+call_stat:
+    call syscall_stat
+    jmp done
+
+call_write:
+    call syscall_write
+    jmp done
+
+call_open:
+    call syscall_open
+    jmp done
+
+call_readdir:
+    call syscall_readdir
+    jmp done
+
+call_close:
+    call syscall_close
+    jmp done
+
+call_isatty:
+    call syscall_isatty
+    jmp done
+
+call_lseek:
+    call syscall_lseek
+    jmp done
+
+call_sbrk:
+    call syscall_sbrk
+    jmp done
+
+call_poll:
+    call syscall_poll
+    jmp done
+
+call_unhandled:
+    call syscall_unhandled
+    jmp done ;this should never be called, since unhandled causes kernel panic
+
+
+    ;;; THIS CALLS NEED REENABLE INTERRUPTS BEFORE calling workers
+    ;; TODO: redesign this shit!
+call_read:
+
+    ;//mov al, 0x20   ;Port number AND command number to Acknowledge IRQ
+    ;//out 0x20, al     ;Acknowledge IRQ, so we keep getting interrupts
+    sti
+
+    call syscall_read
+
+    jmp done_blocking
+
+call_execve:
+
+    pusha
+
+    mov eax,esp
+    mov esp,0x7000
+
+    push ebx
+    push ecx
+    push edx
+
+    mov ebx,eax
+    call syscall_execve
+
+    pop eax
+    pop eax
+    pop eax
+
+    mov esp,ebx
+
+    popa
+
+    jmp done