BurritOS/test_programs/userlib/sys.s
2023-03-08 13:00:38 +01:00

344 lines
5.4 KiB
ArmAsm

/* Start.s
* Assembly language assist for user programs running on top of Nachos.
*
* Since we don't want to pull in the entire C library, we define
* what we need for a user program here, namely Start and the system
* calls.
*
* -----------------------------------------------------
* This file is part of the BurritOS distribution
* Copyright (c) 2022 University of Rennes 1.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details
* (see see <http://www.gnu.org/licenses/>).
* -----------------------------------------------------
*/
#define IN_ASM
#include "userlib/syscall.h"
// Equivalent to ".text", but with a different name, in order
// to be correctly handled by the ldscript
.section .sys,"ax",@progbits
.align 2
/* -------------------------------------------------------------
* __start
* Initialize running a C program, by calling "main".
*
* NOTE: This has to be first, so that it gets loaded at location 0.
* The Nachos kernel always starts a program by jumping to location 0.
* -------------------------------------------------------------
*/
.globl __start
.type __start, @function
__start:
/* Call the program entry point */
call main
li a0, 0
call Exit
jr ra /* if we return from main, exit(0) */
/* -------------------------------------------------------------
* System call stubs:
* Assembly language assist to make system calls to the Nachos kernel.
* There is one stub per system call, that places the code for the
* system call into register r10, and leaves the arguments to the
* system call alone (in other words, arg1 is in r12, arg2 is
* in r13, arg3 is in r14, arg4 is in r15)
*
* The return value is in r10. This follows the standard C calling
* convention on the RISC-V.
* -------------------------------------------------------------
*/
.globl Halt
.type __Halt, @function
Halt:
addi a7,zero,SC_HALT
ecall
jr ra
.globl Exit
.type __Exit, @function
Exit:
addi a7,zero,SC_EXIT
ecall
jr ra
.globl Exec
.type __Exec, @function
Exec:
addi a7,zero,SC_EXEC
ecall
jr ra
.globl Join
.type __Join, @function
Join:
addi a7,zero,SC_JOIN
ecall
jr ra
.globl Create
.type __Create, @function
Create:
addi a7,zero,SC_CREATE
ecall
jr ra
.globl Open
.type __Open, @function
Open:
addi a7,zero,SC_OPEN
ecall
jr ra
.globl Read
.type __Read, @function
Read:
addi a7,zero,SC_READ
ecall
jr ra
.globl Write
.type __Write, @function
Write:
addi a7,zero,SC_WRITE
ecall
jr ra
.globl Seek
.type __Seek, @function
Seek:
addi a7,zero,SC_SEEK
ecall
jr ra
.globl Close
.type __Close, @function
Close:
addi a7,zero,SC_CLOSE
ecall
jr ra
.globl FSList
.type __FSList, @function
FSList:
addi a7,zero,SC_FSLIST
ecall
jr ra
.globl newThread
.type __newThread, @function
newThread:
addi a7,zero,SC_NEW_THREAD
ecall
jr ra
.globl Remove
.type __Remove, @function
Remove:
addi a7,zero,SC_REMOVE
ecall
jr ra
.globl Yield
.type __Yield, @function
Yield:
addi a7,zero,SC_YIELD
ecall
jr ra
.globl PError
.type __PError, @function
PError:
addi a7,zero,SC_PERROR
ecall
jr ra
.globl P
.type __P, @function
P:
addi a7,zero,SC_P
ecall
jr ra
.globl V
.type __V, @function
V:
addi a7,zero,SC_V
ecall
jr ra
.globl SemCreate
.type __SemCreate, @function
SemCreate:
addi a7,zero,SC_SEM_CREATE
ecall
jr ra
.globl SemDestroy
.type __SemDestroy, @function
SemDestroy:
addi a7,zero,SC_SEM_DESTROY
ecall
jr ra
.globl SysTime
.type __SysTime, @function
SysTime:
addi a7,zero,SC_SYS_TIME
ecall
jr ra
.globl LockCreate
.type __LockCreate, @function
LockCreate:
addi a7,zero,SC_LOCK_CREATE
ecall
jr ra
.globl LockDestroy
.type __LockDestroy, @function
LockDestroy:
addi a7,zero,SC_LOCK_DESTROY
ecall
jr ra
.globl LockAcquire
.type __LockAquire, @function
LockAcquire:
addi a7,zero,SC_LOCK_ACQUIRE
ecall
jr ra
.globl LockRelease
.type __LockRelease, @function
LockRelease:
addi a7,zero,SC_LOCK_RELEASE
ecall
jr ra
.globl CondCreate
.type __CondCreate, @function
CondCreate:
addi a7,zero,SC_COND_CREATE
ecall
jr ra
.globl CondDestroy
.type __CondDestroy, @function
CondDestroy:
addi a7,zero,SC_COND_DESTROY
ecall
jr ra
.globl CondWait
.type __CondWait, @function
CondWait:
addi a7,zero,SC_COND_WAIT
ecall
jr ra
.globl CondSignal
.type __CondSignal, @function
CondSignal:
addi a7,zero,SC_COND_SIGNAL
ecall
jr ra
.globl CondBroadcast
.type __CondBroadcast, @function
CondBroadcast:
addi a7,zero,SC_COND_BROADCAST
ecall
jr ra
.globl TtySend
.type __TtySend, @function
TtySend:
addi a7,zero,SC_TTY_SEND
ecall
jr ra
.globl TtyReceive
.type __TtyReceive, @function
TtyReceive:
addi a7,zero,SC_TTY_RECEIVE
ecall
jr ra
.globl Mkdir
.type __Mkdir, @function
Mkdir:
addi a7,zero,SC_MKDIR
ecall
jr ra
.globl Rmdir
.type __Rmdir, @function
Rmdir:
addi a7,zero,SC_RMDIR
ecall
jr ra
.globl Mmap
.type __Mmap, @function
Mmap:
addi a7,zero,SC_MMAP
ecall
jr ra
.globl Debug
.type __Debug, @function
Debug:
addi a7,zero,SC_DEBUG
ecall
jr ra