matos/core/syscall.c
Mathieu Maret d9051ea59c Propagate page fault to ressource handler
Fix mmap arguments handling
2024-02-08 23:15:29 +01:00

101 lines
3.0 KiB
C

#include "syscall.h"
#include "keyboard.h"
#include "klibc.h"
#include "process.h"
#include "stdarg.h"
#include "thread.h"
#include "types.h"
#include "uaccess.h"
#include "uaddrspace.h"
#include "zero.h"
int syscallExecute(int syscallId, const struct cpu_state *userCtx)
{
int ret = 0;
switch (syscallId) {
case SYSCALL_ID_EXIT: {
uint status;
ret = syscallGet1arg(userCtx, &status);
if (ret != 0)
break;
threadExit();
assert(0);
break;
}
case SYSCALL_ID_HELO:
ret = printf("HELLO FROM USERSPACE\n");
break;
case SYSCALL_ID_PUTC: {
unsigned int c;
ret = syscallGet1arg(userCtx, &c);
putc(c);
break;
}
case SYSCALL_ID_READ:
ret = keyboardRead();
break;
case SYSCALL_ID_TEST: {
unsigned int arg1, arg2, arg3, arg4, arg5;
ret = syscallGet5args(userCtx, &arg1, &arg2, &arg3, &arg4, &arg5);
printf("Got 5args from userspace %d %d %d %d %d\n", arg1, arg2, arg3, arg4, arg5);
break;
}
case SYSCALL_ID_BRK:{
struct uAddrSpace *as;
uaddr_t newHeapTop;
as = processGetAddrSpace(getCurrentThread()->process);
ret = syscallGet1arg(userCtx, (unsigned int *)&newHeapTop);
if (ret != 0)
break;
threadChangeCurrentContext(uAddrSpaceGetMMUContext(as));
//TODO : what if *newHeapTop raise page fault?
ret = sysBrk(as, newHeapTop);
threadChangeCurrentContext(NULL);
break;
}
case SYSCALL_ID_MMAP: {
struct uAddrSpace *as;
uaddr_t uaddr;
uaddr_t uaddr_ptr;
size_t size;
uint32_t rights;
uint32_t flags;
uaddr_t userPath;
char path[256];
as = processGetAddrSpace(getCurrentThread()->process);
ret = syscallGet5args(userCtx, (unsigned int *)&uaddr_ptr, (unsigned int *)&size, (unsigned int *)&rights,
(unsigned int *)&flags, (unsigned int *)&userPath);
if (memcpyFromUser((vaddr_t)&uaddr, uaddr_ptr, sizeof(uaddr)) != sizeof(uaddr)) {
ret = -EFAULT;
break;
}
strzcpyFromUser((vaddr_t *)path, (uaddr_t *)userPath, sizeof(path));
printf("Trying mmap for device %s at %lu\n", path, (vaddr_t)uaddr);
if(strcmp(path, "/dev/zero") == 0){
ret = zeroMmap(as, &uaddr, size, rights,flags);
}
if(!ret){
if(memcpyToUser(uaddr_ptr, (vaddr_t)&uaddr, sizeof(uaddr)) != sizeof(uaddr)){
ret = -EFAULT;
break;
}
}
break;
}
default:
printf("Unknon syscall id %d\n", syscallId);
ret = -ENOENT;
}
return ret;
}