68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
#include <syscall.h>
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static inline int syscall1(int num, uint32_t arg1) {
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int ret;
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asm volatile (
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"int $0x80"
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: "=a"(ret)
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: "a"(num), "b"(arg1)
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: "memory"
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);
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return ret;
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}
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static inline int syscall3(int num, uint32_t arg1, uint32_t arg2, uint32_t arg3) {
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int ret;
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asm volatile (
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"int $0x80"
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: "=a"(ret)
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: "a"(num), "b"(arg1), "c"(arg2), "d"(arg3)
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: "memory"
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);
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return ret;
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}
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void exit(int status) {
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syscall1(SYS_EXIT, (uint32_t)status);
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while(1);
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}
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int open(const char* path) {
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return syscall3(SYS_OPEN, (uint32_t)path, 0, 0);
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}
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int write(int fd, const void* buf, size_t cnt) {
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return syscall3(SYS_WRITE, (uint32_t)fd, (uint32_t)buf, (uint32_t)cnt);
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}
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int read(int fd, void* buf, size_t cnt) {
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return syscall3(SYS_READ, (uint32_t)fd, (uint32_t)buf, (uint32_t)cnt);
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}
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int lseek(int fd, size_t offset, int whence) {
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return syscall3(SYS_LSEEK, (uint32_t)fd, offset, whence);
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}
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int close(int fd) {
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return syscall1(SYS_CLOSE, fd);
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}
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int pty(int* slave) {
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return syscall1(SYS_PTY, (uint32_t)slave);
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}
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int fork() {
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return syscall1(SYS_FORK, 0);
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}
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int exec(const char* path) {
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return syscall1(SYS_EXEC, (uint32_t)path);
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}
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int dup2(int src, int dst) {
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return syscall3(SYS_DUP2, src, dst, 0);
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}
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int waitpid(int pid, int* status) {
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return syscall3(SYS_WAIT, pid, (uint32_t)status, 0);
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} |