Inori-dev/syscall.c at master · Sillyplus/Inori-dev · GitHub

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/*******************************************************************************
	> File Name: syscall.c
	> Author: sillyplus
	> Mail: oi_boy@sina.cn
	> Created Time: Tue Apr 21 16:27:49 2015
*******************************************************************************/

__asm__(".code16gcc\n");

#include "syscall.h"
#include "utils_32cc.h"
#include "Inori.h"

#define USER_SPACE_START __asm__ volatile(".intel_syntax noprefix; mov di, 0x7d0; mov ds, di; .att_syntax;":::"di");
#define USER_SPACE_END __asm__ volatile(".intel_syntax noprefix; xor di, di; mov ds, di; .att_syntax;":::"di");

int errno;

static ssize_t read_from_stdin(void *buf, size_t len);
static ssize_t write_to_stdout(const void *buff, size_t len);
static time_t  mktime(int16_t year0, int8_t mon0, int8_t day, int8_t hour, int8_t min, int8_t sec);

void sys_exit() {
    __asm__ volatile(
        ".intel_syntax noprefix;"
        "jmp 0:run_program_cleanup;"
        ".att_syntax"
    );
}

void sys_ouch() {
    const char * const ouch = "OUCH!";
    write_str(ouch, __builtin_strlen(ouch), 0x0c25);
}

void sys_up2low(char *buf, size_t len, size_t pos) {
    USER_SPACE_START
    write_str(buf, len, 0x0d23);
    USER_SPACE_END
}

void    sys_low2up() {

}

void    sys_num2str() {

}

void    sys_str2num() {

}

void    sys_pstr() {

}

// ssize_t sys_read(int fd, void *buf, size_t len) {
//     if (fd != 0) {
//         errno = EBADF;
//         return -1;
//     }
//     return read_from_stdin(buf, len);
// }
//
// ssize_t sys_write(int fd, const void *buf, size_t len) {
//     if (fd != 1 && fd != 2) {
//         errno = EBADF;
//         return -1;
//     }
//     return write_to_stdout(buf, len);
// }
//
// time_t sys_time(time_t *t) {
//     int16_t hour_minutes, seconds_ds, cen_year, month_day, year;
//     int8_t  hour, minutes, seconds, month, day, dst;
//     time_t  ret;
//
//     return ret;
// }
//
// static ssize_t read_from_stdin(void *buf, size_t len) {
//     ssize_t count = 0;
//     char *_buf = (char *)buf, tmp;
//     USER_SPACE_START
//     while (len--) {
//         if (0x04 == (tmp = get_kb_char()))
//             break;
//         if (tmp == '\r')
//             tmp = '\n';
//         *(_buf++) = tmp;
//         ++count;
//     }
//     USER_SPACE_END
//     return count;
// }
//
// static ssize_t write_to_stdout(const void *buf, size_t len) {
//     ssize_t count = 0;
//     const char *_buf = (const char *)buf;
//     USER_SPACE_START
//     while (len--) {
//         if (*_buf == '\n')
//             write_char('\r');
//         write_char(*(_buf++));
//         count++;
//     }
//     USER_SPACE_END
//     return count;
// }