; AcssMicro - System Calls
; ========================
-%include "../../../Kernel/include/syscalls.inc.asm"
-
[bits 64]
[section .text]
+[global _start]
+[extern SoMain]
+_start:
+ mov rdi, [rsp ] ; Base
+ mov rsi, [rsp+ 8] ; ArgC
+ mov rdx, [rsp+16] ; ArgV
+ mov rcx, [rsp+24] ; EnvP
+ call SoMain
+
+ mov rdi, [rsp+8]
+ mov rsi, [rsp+16]
+ mov rdx, [rsp+24]
+ call rax
+
+ mov rdi, rax
+ call _exit
+
; DEST
; SRC
_memcpy:
push rbp
mov rbp, rsp
- push rdi
- push rsi ; // DI and SI must be maintained, CX doesn't
- mov rcx, [rbp+4*8]
- mov rsi, [rbp+3*8]
- mov rdi, [rbp+2*8]
+ ; RDI - First Param
+ ; RSI - Second Param
+ mov rcx, rdx ; RDX - Third
rep movsb
- pop rsi
- pop rdi
pop rbp
ret
#define SYSCALL6(_name,_num) SYSCALL6 _name, _num
;%define SYSCALL_OP jmp 0xCFFF0000
-%define SYSCALL_OP int 0xAC
+;%define SYSCALL_OP int 0xAC
+%define SYSCALL_OP syscall
; System Call - No Arguments
%macro SYSCALL0 2
[global %1:func]
%1:
push rbx
+ push rbp
mov eax, %2
SYSCALL_OP
mov [DWORD rel _errno], ebx
+ pop rbp
pop rbx
ret
%endmacro
; System Call - 1 Argument
%macro SYSCALL1 2
_SYSCALL_HEAD %1, %2
- mov rbx, [rbp+2*8]
+; mov rdi, [rbp+3*8]
SYSCALL_OP
_SYSCALL_TAIL
%endmacro
; System Call - 2 Arguments
%macro SYSCALL2 2
_SYSCALL_HEAD %1, %2
- mov rbx, [rbp+2*8]
- mov rcx, [rbp+3*8]
+; mov rdi, [rbp+3*8]
+; mov rsi, [rbp+4*8]
SYSCALL_OP
_SYSCALL_TAIL
%endmacro
; System Call - 3 Arguments
%macro SYSCALL3 2
_SYSCALL_HEAD %1, %2
- mov rbx, [rbp+2*8]
- mov rcx, [rbp+3*8]
- mov rdx, [rbp+4*8]
+; mov rdi, [rbp+3*8]
+; mov rsi, [rbp+4*8]
+; mov rdx, [rbp+5*8]
SYSCALL_OP
_SYSCALL_TAIL
%endmacro
; System Call - 4 Arguments
%macro SYSCALL4 2
_SYSCALL_HEAD %1, %2
- push rdi
- mov rbx, [rbp+2*8]
- mov rcx, [rbp+3*8]
- mov rdx, [rbp+4*8]
- mov rdi, [rbp+5*8]
+; mov rdi, [rbp+2*8]
+; mov rsi, [rbp+3*8]
+; mov rdx, [rbp+4*8]
+ mov r10, rcx ; r10 is used in place of RCX
SYSCALL_OP
- pop rdi
_SYSCALL_TAIL
%endmacro
; System Call - 5 Arguments
%macro SYSCALL5 2
_SYSCALL_HEAD %1, %2
- push rdi
- push rsi
- mov rbx, [rbp+2*8]
- mov rcx, [rbp+3*8]
- mov rdx, [rbp+4*8]
- mov rdi, [rbp+5*8]
- mov rsi, [rbp+6*8]
+; mov rdi, [rbp+2*8]
+; mov rsi, [rbp+3*8]
+; mov rdx, [rbp+4*8]
+ mov r10, rcx
+; mov r8, [rbp+6*8]
SYSCALL_OP
- pop rsi
- pop rdi
_SYSCALL_TAIL
%endmacro
; System Call - 6 Arguments
%macro SYSCALL6 2
_SYSCALL_HEAD %1, %2
- push rdi
- push rsi
- mov rbx, [rbp+2*8]
- mov rcx, [rbp+3*8]
- mov rdx, [rbp+4*8]
- mov rdi, [rbp+5*8]
- mov rsi, [rbp+6*8]
- mov rbp, [rbp+7*8]
+; mov rdi, [rbp+2*8]
+; mov rsi, [rbp+3*8]
+; mov rdx, [rbp+4*8]
+ mov r10, rcx
+; mov r8, [rbp+6*8]
+; mov r9, [rbp+7*8]
SYSCALL_OP
- pop rsi
- pop rdi
_SYSCALL_TAIL
%endmacro
; // Override the clone syscall
#define clone _clone_raw
+#define _exit _exit_raw
#include "syscalls.s.h"
#undef clone
+#undef _exit
[global clone:func]
clone:
push rbp
mov rbp, rsp
push rbx
+ push r12
- mov rbx, [rbp+3*8] ; Get new stack pointer
+ mov r12, rsi ; Save in a reg for after the clone
; Check if the new stack is being used
- test rbx, rbx
+ test rsi, rsi
jz .doCall
; Quick hack, just this stack frame
mov rax, [rbp+1*8]
- mov [rbx-1*8], rax ; Return
- mov [rbx-2*8], rbx ; EBP
- and QWORD [rbx-3*8], BYTE 0 ; EBX
- sub rbx, 3*8
+ mov [rsi-1*8], rax ; Return
+ mov [rsi-2*8], rsi ; EBP
+ and QWORD [rsi-3*8], BYTE 0 ; EBX
+ sub rsi, 3*8
.doCall:
mov eax, SYS_CLONE
- mov rcx, rbx ; Stack
- mov rbx, [rbp+2*8] ; Flags
SYSCALL_OP
mov [rel _errno], ebx
+
+ ; Change stack pointer
+ test eax, eax
+ jnz .ret
+ test r12, r12
+ jz .ret
+ mov rsp, rsi
+.ret:
+ pop r12
pop rbx
pop rbp
ret
+
+[global _exit:func]
+_exit:
+ xor eax, eax
+ SYSCALL_OP
+ jmp $
+
+; vim: ft=nasm