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/** @file syscall_io.c
*
* @brief IO syscalls.
*
* @author Hanjie Wu (hanjiew)
* @bug No functional bugs
*/
#include <common_kern.h>
#include <elf/elf_410.h>
#include <string.h>
#include <ureg.h>
#include <x86/asm.h>
#include <x86/cr.h>
#include <x86/eflags.h>
#include <x86/seg.h>
#include <pts.h>
#include <malloc.h>
#include <mm.h>
#include <paging.h>
#include <sched.h>
#include <usermem.h>
/**
* @brief print() syscall handler
* @param f saved regs
*/
void sys_print_real(stack_frame_t* f) {
reg_t esi = f->esi;
int len;
if (copy_from_user((va_t)esi, sizeof(int), &len) != 0) {
goto read_fail;
}
if (len < 0) {
goto bad_length;
}
va_t base;
if (copy_from_user((va_t)esi + sizeof(va_t), sizeof(va_t), &base) != 0) {
goto read_fail;
}
pts_t* pts = get_current()->pts;
mutex_lock(&pts->lock);
f->eax = (reg_t)print_buf_from_user(pts, base, len);
mutex_unlock(&pts->lock);
return;
read_fail:
f->eax = (reg_t)-1;
return;
bad_length:
f->eax = (reg_t)-2;
}
/**
* @brief set_term_color() syscall handler
* @param f saved regs
*/
void sys_set_term_color_real(stack_frame_t* f) {
reg_t esi = f->esi;
pts_t* pts = get_current()->pts;
mutex_lock(&pts->lock);
f->eax = (reg_t)pts_set_term_color(pts, (int)esi);
mutex_unlock(&pts->lock);
}
/**
* @brief set_cursor_pos() syscall handler
* @param f saved regs
*/
void sys_set_cursor_pos_real(stack_frame_t* f) {
reg_t esi = f->esi;
int row, col;
if (copy_from_user((va_t)esi, sizeof(int), &row) != 0) {
goto read_arg_fail;
}
if (copy_from_user((va_t)(esi + sizeof(va_t)), sizeof(int), &col) != 0) {
goto read_arg_fail;
}
pts_t* pts = get_current()->pts;
mutex_lock(&pts->lock);
f->eax = (reg_t)pts_set_cursor(pts, row, col);
mutex_unlock(&pts->lock);
return;
read_arg_fail:
f->eax = (reg_t)-1;
return;
}
/**
* @brief get_cursor_pos() syscall handler
* @param f saved regs
*/
void sys_get_cursor_pos_real(stack_frame_t* f) {
reg_t esi = f->esi;
va_t prow, pcol;
if (copy_from_user((va_t)esi, sizeof(va_t), &prow) != 0) {
goto read_arg_fail;
}
if (copy_from_user((va_t)(esi + sizeof(va_t)), sizeof(va_t), &pcol) != 0) {
goto read_arg_fail;
}
int row, col;
pts_t* pts = get_current()->pts;
mutex_lock(&pts->lock);
pts_get_cursor(pts, &row, &col);
mutex_unlock(&pts->lock);
if (copy_to_user(prow, sizeof(int), &row) != 0) {
goto bad_arg;
}
if (copy_to_user(pcol, sizeof(int), &col) != 0) {
goto bad_arg;
}
f->eax = 0;
return;
bad_arg:
read_arg_fail:
f->eax = (reg_t)-1;
return;
}
/**
* @brief getchar() syscall handler
* @param f saved regs
*/
void sys_getchar_real(stack_frame_t* f) {
f->eax = (reg_t)do_getchar();
}
/**
* @brief readline() syscall handler
* @param f saved regs
*/
void sys_readline_real(stack_frame_t* f) {
int len;
va_t buf;
reg_t esi = f->esi;
if (copy_from_user((va_t)esi, sizeof(int), &len) != 0) {
goto read_arg_fail;
}
if (copy_from_user((va_t)(esi + sizeof(va_t)), sizeof(va_t), &buf) != 0) {
goto read_arg_fail;
}
f->eax = (reg_t)do_readline(len, buf);
return;
read_arg_fail:
f->eax = (reg_t)-1;
return;
}
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