static void faulted(int fuckoff, int userspace, addr_t ip, long err_code, struct registers *regs)
{
printk(0, "Fault: %d %d\n", userspace, current_thread->system);
if(!current_thread || current_thread->system || !userspace)
{
//if(fuckoff == 3)
//debugger_enter();
//else
kernel_fault(fuckoff, ip, err_code, regs);
} else
{
printk(5, "%s occured in task %d (ip=%x, err=%x (%d), usersp=%x): He's dead, Jim.\n", exception_messages[fuckoff], current_thread->tid, ip, err_code, err_code, regs->useresp);
// We die for different reasons on different interrupts.
switch(fuckoff)
{
case 0:
tm_signal_send_thread(current_thread, SIGFPE);
break;
case 5: case 6: case 13:
tm_signal_send_thread(current_thread, SIGILL);
break;
case 1: case 3: case 4:
tm_signal_send_thread(current_thread, SIGTRAP);
break;
case 8: case 18:
tm_signal_send_thread(current_thread, SIGABRT);
break;
default:
tm_signal_send_thread(current_thread, SIGABRT);
break;
}
tm_thread_exit(-9);
}
}
int do_exec(char *path, char **argv, char **env, int shebanged /* oh my */)
{
unsigned int i=0;
addr_t end, eip;
unsigned int argc=0, envc=0;
char **backup_argv=0, **backup_env=0;
/* Sanity */
if(!path || !*path)
return -EINVAL;
/* Load the file, and make sure that it is valid and accessible */
if(EXEC_LOG == 2)
printk(0, "[%d]: Checking executable file (%s)\n", current_process->pid, path);
struct file *efil;
int err_open;
efil = fs_file_open(path, _FREAD, 0, &err_open);
if(!efil)
return err_open;
/* are we allowed to execute it? */
if(!vfs_inode_check_permissions(efil->inode, MAY_EXEC, 0))
{
file_put(efil);
return -EACCES;
}
/* is it a valid elf? */
int header_size = 0;
#if CONFIG_ARCH == TYPE_ARCH_X86_64
header_size = sizeof(elf64_header_t);
#elif CONFIG_ARCH == TYPE_ARCH_X86
header_size = sizeof(elf32_header_t);
#endif
/* read in the ELF header, and check if it's a shebang */
if(header_size < 2) header_size = 2;
unsigned char mem[header_size];
fs_file_pread(efil, 0, mem, header_size);
if(__is_shebang(mem))
return loader_do_shebang(efil, argv, env);
int other_bitsize=0;
if(!is_valid_elf(mem, 2) && !other_bitsize) {
file_put(efil);
return -ENOEXEC;
}
if(EXEC_LOG == 2)
printk(0, "[%d]: Copy data\n", current_process->pid);
/* okay, lets back up argv and env so that we can
* clear out the address space and not lose data...
* If this call if coming from a shebang, then we don't check the pointers,
* since they won't be from userspace */
size_t total_args_len = 0;
if((shebanged || mm_is_valid_user_pointer(SYS_EXECVE, argv, 0)) && argv) {
while((shebanged || mm_is_valid_user_pointer(SYS_EXECVE, argv[argc], 0)) && argv[argc] && *argv[argc])
argc++;
backup_argv = (char **)kmalloc(sizeof(addr_t) * argc);
for(i=0;i<argc;i++) {
backup_argv[i] = (char *)kmalloc(strlen(argv[i]) + 1);
_strcpy(backup_argv[i], argv[i]);
total_args_len += strlen(argv[i])+1 + sizeof(char *);
}
}
if((shebanged || mm_is_valid_user_pointer(SYS_EXECVE, env, 0)) && env) {
while((shebanged || mm_is_valid_user_pointer(SYS_EXECVE, env[envc], 0)) && env[envc] && *env[envc]) envc++;
backup_env = (char **)kmalloc(sizeof(addr_t) * envc);
for(i=0;i<envc;i++) {
backup_env[i] = (char *)kmalloc(strlen(env[i]) + 1);
_strcpy(backup_env[i], env[i]);
total_args_len += strlen(env[i])+1 + sizeof(char *);
}
}
total_args_len += 2 * sizeof(char *);
/* and the path too! */
char *path_backup = (char *)kmalloc(strlen(path) + 1);
_strcpy((char *)path_backup, path);
path = path_backup;
/* Preexec - This is the point of no return. Here we close out unneeded
* file descs, free up the page directory and clear up the resources
* of the task */
if(EXEC_LOG)
printk(0, "Executing (p%dt%d, cpu %d, tty %d): %s\n", current_process->pid, current_thread->tid, current_thread->cpu->knum, current_process->pty ? current_process->pty->num : 0, path);
preexec();
/* load in the new image */
strncpy((char *)current_process->command, path, 128);
if(!loader_parse_elf_executable(mem, efil, &eip, &end))
eip=0;
/* do setuid and setgid */
if(efil->inode->mode & S_ISUID) {
current_process->effective_uid = efil->inode->uid;
}
if(efil->inode->mode & S_ISGID) {
current_process->effective_gid = efil->inode->gid;
}
/* we don't need the file anymore, close it out */
file_put(efil);
file_close_cloexec();
if(!eip) {
printk(5, "[exec]: Tried to execute an invalid ELF file!\n");
free_dp(backup_argv, argc);
free_dp(backup_env, envc);
kfree(path);
tm_thread_exit(0);
}
if(EXEC_LOG == 2)
printk(0, "[%d]: Updating task values\n", current_process->pid);
/* Setup the task with the proper values (libc malloc stack) */
addr_t end_l = end;
end = ((end-1)&PAGE_MASK) + PAGE_SIZE;
total_args_len += PAGE_SIZE;
/* now we need to copy back the args and env into userspace
* writeable memory...yippie. */
addr_t args_start = end + PAGE_SIZE;
addr_t env_start = args_start;
addr_t alen = 0;
mm_mmap(end, total_args_len,
PROT_READ | PROT_WRITE, MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, 0, 0, 0);
if(backup_argv) {
memcpy((void *)args_start, backup_argv, sizeof(addr_t) * argc);
alen += sizeof(addr_t) * argc;
*(addr_t *)(args_start + alen) = 0; /* set last argument value to zero */
alen += sizeof(addr_t);
argv = (char **)args_start;
for(i=0;i<argc;i++)
{
char *old = argv[i];
char *new = (char *)(args_start+alen);
unsigned len = strlen(old) + 4;
argv[i] = new;
_strcpy(new, old);
kfree(old);
alen += len;
}
kfree(backup_argv);
}
env_start = args_start + alen;
alen = 0;
if(backup_env) {
memcpy((void *)env_start, backup_env, sizeof(addr_t) * envc);
alen += sizeof(addr_t) * envc;
*(addr_t *)(env_start + alen) = 0; /* set last argument value to zero */
alen += sizeof(addr_t);
env = (char **)env_start;
for(i=0;i<envc;i++)
{
char *old = env[i];
char *new = (char *)(env_start+alen);
unsigned len = strlen(old) + 1;
env[i] = new;
_strcpy(new, old);
kfree(old);
alen += len;
}
kfree(backup_env);
}
end = (env_start + alen) & PAGE_MASK;
current_process->env = env;
current_process->argv = argv;
kfree(path);
/* set the heap locations, and map in the start */
current_process->heap_start = current_process->heap_end = end + PAGE_SIZE*2;
addr_t ret = mm_mmap(end + PAGE_SIZE, PAGE_SIZE,
PROT_READ | PROT_WRITE, MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, 0, 0, 0);
/* now, we just need to deal with the syscall return stuff. When the syscall
* returns, it'll just jump into the entry point of the new process */
tm_thread_lower_flag(current_thread, THREAD_SCHEDULE);
/* the kernel cares if it has executed something or not */
if(!(kernel_state_flags & KSF_HAVEEXECED))
set_ksf(KSF_HAVEEXECED);
arch_loader_exec_initializer(argc, eip);
if(EXEC_LOG == 2)
printk(0, "[%d]: Performing call\n", current_process->pid);
return 0;
}
void sys_exit(int code)
{
tm_thread_exit(code);
}
