Mark
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
#include "sys/amd64/cpu.h"
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#include "sys/thread.h"
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#include "sys/assert.h"
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#include "sys/types.h"
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#include "sys/debug.h"
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#include "sys/errno.h"
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static ssize_t sys_read(int fd, void *buf, size_t lim);
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static ssize_t sys_write(int fd, const void *buf, size_t lim);
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static void sys_exit(int status);
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uint8_t irq1_key = 0;
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intptr_t amd64_syscall(uintptr_t rdi, uintptr_t rsi, uintptr_t rdx, uintptr_t rcx, uintptr_t r10, uintptr_t rax) {
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switch (rax) {
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case 0:
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return sys_read((int) rdi, (void *) rsi, (size_t) rdx);
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case 1:
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return sys_write((int) rdi, (const void *) rsi, (size_t) rdx);
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case 60:
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sys_exit((int) rdi);
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// TODO: call sched_remove and reschedule a new task so that
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// this one does not return
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asm volatile ("sti; hlt");
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panic("This should not happen\n");
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// WTF?
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return -1;
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default:
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kdebug("unknown syscall: %u\n", rax);
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return -1;
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}
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return 0;
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}
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static ssize_t sys_read(int fd, void *buf, size_t lim) {
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if (fd >= 4 || fd < 0) {
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return -EBADF;
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}
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struct thread *thr = get_cpu()->thread;
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_assert(thr);
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struct ofile *of = &thr->fds[fd];
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if (!of->vnode) {
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return -EBADF;
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}
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return vfs_read(&thr->ioctx, of, buf, lim);
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}
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static void sys_exit(int status) {
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struct thread *thr = get_cpu()->thread;
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_assert(thr);
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kdebug("%u exited with code %d\n", thr->pid, status);
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thr->flags |= THREAD_STOPPED;
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}
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static ssize_t sys_write(int fd, const void *buf, size_t lim) {
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if (fd >= 4 || fd < 0) {
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return -EBADF;
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}
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struct thread *thr = get_cpu()->thread;
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_assert(thr);
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struct ofile *of = &thr->fds[fd];
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if (!of->vnode) {
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return -EBADF;
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}
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return vfs_write(&thr->ioctx, of, buf, lim);
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}
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