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Copy pathentry.S
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379 lines (349 loc) · 8.35 KB
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/*
* entry.S - Entry point to system mode from user mode
*/
#include <asm.h>
#include <segment.h>
#include <errno.h>
/**************************************************/
/**** Save & Restore ******************************/
/** **/
/** When we change to privilege level 0 (kernel) **/
/** (through an interrupt, a system call, an **/
/** exception ...) we must save the state of the **/
/** currently running task (save). **/
/** **/
/** Stack layout in 'systemCall': **/
/** **/
/** 0(%esp) - %ebx \ **/
/** 4(%esp) - %ecx | **/
/** 8(%esp) - %edx | **/
/** C(%esp) - %esi | Register saved **/
/** 10(%esp) - %edi | by 'save' **/
/** 14(%esp) - %ebp | **/
/** 18(%esp) - %eax | **/
/** 1C(%esp) - %ds | **/
/** 20(%esp) - %es | **/
/** 24(%esp) - %fs | **/
/** 28(%esp) - %gs / **/
/** 2C(%esp) - %eip \ **/
/** 30(%esp) - %cs | **/
/** 34(%esp) - %eflags | Return context saved **/
/** 38(%esp) - %oldesp | by the processor. **/
/** 3C(%esp) - %oldss / **/
/** **/
/**************************************************/
#define SAVE_ALL\
pushl %gs ;\
pushl %fs ;\
pushl %es ;\
pushl %ds ;\
pushl %eax ;\
pushl %ebp ;\
pushl %edi ;\
pushl %esi ;\
pushl %edx ;\
pushl %ecx ;\
pushl %ebx ;\
movl $__KERNEL_DS, %edx ;\
movl %edx, %ds ;\
movl %edx, %es
#define RESTORE_ALL\
popl %ebx ;\
popl %ecx ;\
popl %edx ;\
popl %esi ;\
popl %edi ;\
popl %ebp ;\
popl %eax ;\
popl %ds ;\
popl %es ;\
popl %fs ;\
popl %gs
#define EOI\
movb $0x20,%al ;\
outb %al, $0x20
#define MINSTAB 0
#define MAXSTAB 141
ENTRY(divide_error_handler)
SAVE_ALL
call divide_error_routine
RESTORE_ALL
iret
ENTRY(debug_handler)
SAVE_ALL
call debug_routine
RESTORE_ALL
iret
ENTRY(nmi_handler)
SAVE_ALL
call nmi_routine
RESTORE_ALL
iret
ENTRY(breakpoint_handler)
SAVE_ALL
call breakpoint_routine
RESTORE_ALL
iret
ENTRY(overflow_handler)
SAVE_ALL
call overflow_routine
RESTORE_ALL
iret
ENTRY(bounds_check_handler)
SAVE_ALL
call bounds_check_routine
RESTORE_ALL
iret
ENTRY(invalid_opcode_handler)
SAVE_ALL
call invalid_opcode_routine
RESTORE_ALL
iret
ENTRY(device_not_available_handler)
SAVE_ALL
call device_not_available_routine
RESTORE_ALL
iret
ENTRY(double_fault_handler)
SAVE_ALL
call double_fault_routine
RESTORE_ALL
addl $4,%esp
iret
ENTRY(coprocessor_segment_overrun_handler)
SAVE_ALL
call coprocessor_segment_overrun_routine
RESTORE_ALL
iret
ENTRY(invalid_tss_handler)
SAVE_ALL
call invalid_tss_routine
RESTORE_ALL
addl $4,%esp
iret
ENTRY(segment_not_present_handler)
SAVE_ALL
call segment_not_present_routine
RESTORE_ALL
addl $4,%esp
iret
ENTRY(stack_exception_handler)
SAVE_ALL
call stack_exception_routine
RESTORE_ALL
addl $4,%esp
iret
ENTRY(general_protection_handler)
SAVE_ALL
call general_protection_routine
RESTORE_ALL
addl $4,%esp
iret
ENTRY(page_fault_handler)
SAVE_ALL
call page_fault_routine
RESTORE_ALL
addl $4,%esp
iret
ENTRY(floating_point_error_handler)
SAVE_ALL
call floating_point_error_routine
RESTORE_ALL
iret
ENTRY(alignment_check_handler)
SAVE_ALL
call alignment_check_routine
RESTORE_ALL
addl $4, %esp
iret
ENTRY(clock_handler)
SAVE_ALL
call clock_routine
EOI
RESTORE_ALL
iret
ENTRY(keyboard_handler)
SAVE_ALL
call keyboard_routine
EOI
RESTORE_ALL
iret
/*
* IA32 system calls via int 0x80.
*
* Arguments:
* %eax System call number.
* %ebx Arg1
* %ecx Arg2
* %edx Arg3
* %esi Arg4
* %edi Arg5
* %ebp Arg6 [note: not saved in the stack frame, should not be touched]
*
* Notes:
* En la entrega 1.1 nomes hem posat 10 espais per fer les crides
* al sistema, pero en un futur n'hi pot haver mes. Nomes s'ha de
* canviar el cmpl $10,%eax de la funcio system_call_handler per
* comprovar que no s'arriba a n-1 crides possibles. Tambe s'hauran
* d'afegir les n entrades corresponents que hi faltin a la
* sys_call_table
*/
ENTRY(system_call_handler)
SAVE_ALL
cmpl $MINSTAB,%eax
jl out_of_bounds
cmpl $MAXSTAB,%eax
jg out_of_bounds
call *sys_call_table(,%eax,0x04)
movl %eax,24(%esp)
RESTORE_ALL
iret
out_of_bounds:
movl $-ENOSYS,24(%esp)
RESTORE_ALL
iret
//ENTRY(sys_ni_syscall)
// jmp out_of_bounds
ENTRY(sys_call_table)
.long sys_ni_syscall /* @ system call #0 */
.long sys_exit /* @ crida al sistema Exit 0x1 */
.long sys_fork /* @ Crida al sistema Fork 0x2 */
.long sys_read /* @ Crida al sistema Read 0x3 */
.long sys_write /* @ Crida al sistema Write 0x4 */
.long sys_open /* @ Crida al sistema Open 0x5 */
.long sys_close /* @ Crida al sistema Close 0x6 */
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_unlink /*@ Crida al sistema Unlink #10*/
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_getpid /* @ Crida al sistema getpid 0x14 (#20)*/
.long sys_sem_init /* @ Crida al sistema sem_init # 21 */
.long sys_sem_wait /* @ Crida al sistema sem_wait # 22 */
.long sys_sem_signal /* @ Crida al sistema sem_signal # 23 */
.long sys_sem_destroy /* @ Crida al sistema sem_destroy # 24 */
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall /* @ system call #30*/
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_nice /* @ Crida al sistema nice #34 */
.long sys_get_stats /* @ Crida al sistema get_stats #35 */
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_dup /* @ Crida al sistema dup #41 */
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_ni_syscall
.long sys_readdir