arg_t _pipe(void)
{
int8_t u1, u2, oft1, oft2;
inoptr ino;
/* bug fix SN */
if ((u1 = uf_alloc()) == -1)
goto nogood;
if ((oft1 = oft_alloc()) == -1)
goto nogood;
udata.u_files[u1] = oft1;
if ((u2 = uf_alloc()) == -1)
goto nogood2;
if ((oft2 = oft_alloc()) == -1)
goto nogood2;
if (!(ino = i_open(root_dev, 0))) {
oft_deref(oft2);
goto nogood2;
}
udata.u_files[u2] = oft2;
of_tab[oft1].o_ptr = 0;
of_tab[oft1].o_inode = ino;
of_tab[oft1].o_access = O_RDONLY;
of_tab[oft2].o_ptr = 0;
of_tab[oft2].o_inode = ino;
of_tab[oft2].o_access = O_WRONLY;
++ino->c_refs;
ino->c_node.i_mode = F_PIPE | 0777; /* No permissions necessary on pipes */
ino->c_node.i_nlink = 0; /* a pipe is not in any directory */
// write results to userspace
uputw(u1, fildes);
uputw(u2, fildes + 1);
return (0);
nogood2:
oft_deref(oft1);
udata.u_files[u1] = NO_FILE;
nogood:
return (-1);
}
arg_t _waitpid(void)
{
ptptr p;
int retval;
if (statloc && !valaddr((char *) statloc, sizeof(int))) {
udata.u_error = EFAULT;
return (-1);
}
/* FIXME: move this scan into the main loop and also error
on a complete loop finding no matchi for pid */
/* See if we have any children. */
for (p = ptab; p < ptab_end; ++p) {
if (p->p_status && p->p_pptr == udata.u_ptab
&& p != udata.u_ptab)
goto ok;
}
udata.u_error = ECHILD;
return (-1);
ok:
if (pid == 0)
pid = -udata.u_ptab->p_pgrp;
/* Search for an exited child; */
for (;;) {
chksigs();
if (udata.u_cursig) {
udata.u_error = EINTR;
return -1;
}
for (p = ptab; p < ptab_end; ++p) {
if (p->p_status == P_ZOMBIE
&& p->p_pptr == udata.u_ptab) {
if (pid == -1 || p->p_pid == pid
|| p->p_pgrp == -pid) {
if (statloc)
uputw(p->p_exitval,
statloc);
retval = p->p_pid;
p->p_status = P_EMPTY;
/* Add in child's time info. It was stored on top */
/* of p_priority in the childs process table entry. */
udata.u_cutime += ((clock_t *)p->p_priority)[0];
udata.u_cstime += ((clock_t *)p->p_priority)[1];
return retval;
}
}
}
/* Nothing yet, so wait */
if (options & WNOHANG)
break;
psleep(udata.u_ptab);
}
udata.u_error = EINTR;
return -1;
}
int sys_ioctl(uint8_t minor, uint16_t request, char *data)
{
if (minor != 3) {
udata.u_error = ENOTTY;
return -1;
}
switch (request) {
case PIO_TABSIZE:
uputw(maxproc, data);
break;
case PIO_ENTRYSIZE:
uputw(sizeof(struct p_tab), data);
break;
default:
udata.u_error = EINVAL;
return (-1);
}
return 0;
}
void signal_frame(uint8_t *trapframe, uint32_t d0, uint32_t d1, uint32_t a0,
uint32_t a1)
{
extern void *udata_shadow;
uint8_t *usp = get_usp();
udata_ptr = udata_shadow;
uint16_t ccr = *(uint16_t *)trapframe;
uint32_t addr = *(uint32_t *)(trapframe + 2);
int err = 0;
/* Build the user stack frame */
/* FIXME: eventually we should put the trap frame details and trap
info into the frame */
usp -= 4;
err |= uputl(addr, usp);
usp -= 4;
err |= uputw(ccr, usp);
usp -= 2;
err |=uputl(a1, usp);
usp -= 4;
err |= uputl(a0, usp);
usp -= 4;
err |= uputl(d1, usp);
usp -= 4;
err |= uputl(d0, usp);
usp -= 4;
err |= uputl(udata.u_codebase + 4, usp);
set_usp(usp);
if (err) {
kprintf("%d: stack fault\n", udata.u_ptab->p_pid);
doexit(dump_core(SIGKILL));
}
/* Now patch up the kernel frame */
*(uint16_t *)trapframe = 0;
*(uint32_t *)(trapframe + 2) = (uint32_t)udata.u_sigvec[udata.u_cursig];
udata.u_sigvec[udata.u_cursig] = SIG_DFL;
udata.u_cursig = 0;
}
arg_t _execve(void)
{
/* We aren't re-entrant where this matters */
uint8_t hdr[16];
staticfast inoptr ino;
char **nargv; /* In user space */
char **nenvp; /* In user space */
struct s_argblk *abuf, *ebuf;
int argc;
uint16_t progptr;
uint16_t progload;
staticfast uint16_t top;
uint16_t bin_size; /* Will need to be bigger on some cpus */
uint16_t bss;
top = ramtop;
if (!(ino = n_open_lock(name, NULLINOPTR)))
return (-1);
if (!((getperm(ino) & OTH_EX) &&
(ino->c_node.i_mode & F_REG) &&
(ino->c_node.i_mode & (OWN_EX | OTH_EX | GRP_EX)))) {
udata.u_error = EACCES;
goto nogood;
}
setftime(ino, A_TIME);
udata.u_offset = 0;
udata.u_count = 16;
udata.u_base = hdr;
udata.u_sysio = true;
readi(ino, 0);
if (udata.u_done != 16) {
udata.u_error = ENOEXEC;
goto nogood;
}
if (!header_ok(hdr)) {
udata.u_error = ENOEXEC;
goto nogood2;
}
progload = hdr[7] << 8;
if (progload == 0)
progload = PROGLOAD;
top = *(uint16_t *)(hdr + 8);
if (top == 0) /* Legacy 'all space' binary */
top = ramtop;
else /* Requested an amount, so adjust for the base */
top += progload;
bss = *(uint16_t *)(hdr + 14);
/* Binary doesn't fit */
/* FIXME: review overflows */
bin_size = ino->c_node.i_size;
progptr = bin_size + 1024 + bss;
if (progload < PROGLOAD || top - progload < progptr || progptr < bin_size) {
udata.u_error = ENOMEM;
goto nogood2;
}
udata.u_ptab->p_status = P_NOSLEEP;
/* If we made pagemap_realloc keep hold of some defined area we
could in theory just move the arguments up or down as part of
the process - that would save us all this hassle but replace it
with new hassle */
/* Gather the arguments, and put them in temporary buffers. */
abuf = (struct s_argblk *) tmpbuf();
/* Put environment in another buffer. */
ebuf = (struct s_argblk *) tmpbuf();
/* Read args and environment from process memory */
if (rargs(argv, abuf) || rargs(envp, ebuf))
goto nogood3; /* SN */
/* This must be the last test as it makes changes if it works */
/* FIXME: once we sort out chmem we can make stack and data
two elements. We never allocate 'code' as there is no split I/D */
/* This is only safe from deadlocks providing pagemap_realloc doesn't
sleep */
if (pagemap_realloc(0, top - MAPBASE, 0))
goto nogood3;
/* From this point on we are commmited to the exec() completing */
/* Core dump and ptrace permission logic */
#ifdef CONFIG_LEVEL_2
/* Q: should uid == 0 mean we always allow core */
if ((!(getperm(ino) & OTH_RD)) ||
(ino->c_node.i_mode & (SET_UID | SET_GID)))
udata.u_flags |= U_FLAG_NOCORE;
else
udata.u_flags &= ~U_FLAG_NOCORE;
#endif
udata.u_top = top;
udata.u_ptab->p_top = top;
/* setuid, setgid if executable requires it */
if (ino->c_node.i_mode & SET_UID)
udata.u_euid = ino->c_node.i_uid;
if (ino->c_node.i_mode & SET_GID)
udata.u_egid = ino->c_node.i_gid;
/* FIXME: In the execve case we may on some platforms have space
below PROGLOAD to clear... */
/* We are definitely going to succeed with the exec,
* so we can start writing over the old program
*/
uput(hdr, (uint8_t *)progload, 16);
/* At this point, we are committed to reading in and
* executing the program. This call must not block. */
close_on_exec();
/*
* Read in the rest of the program, block by block. We rely upon
* the optimization path in readi to spot this is a big move to user
* space and move it directly.
*/
progptr = progload + 16;
if (bin_size > 16) {
bin_size -= 16;
udata.u_base = (uint8_t *)progptr; /* We copied the first block already */
udata.u_count = bin_size;
udata.u_sysio = false;
readi(ino, 0);
if (udata.u_done != bin_size)
goto nogood4;
progptr += bin_size;
}
/* Wipe the memory in the BSS. We don't wipe the memory above
that on 8bit boxes, but defer it to brk/sbrk() */
uzero((uint8_t *)progptr, bss);
/* Set initial break for program */
udata.u_break = (int)ALIGNUP(progptr + bss);
/* Turn off caught signals */
memset(udata.u_sigvec, 0, sizeof(udata.u_sigvec));
// place the arguments, environment and stack at the top of userspace memory,
// Write back the arguments and the environment
nargv = wargs(((char *) top - 2), abuf, &argc);
nenvp = wargs((char *) (nargv), ebuf, NULL);
// Fill in udata.u_name with program invocation name
uget((void *) ugetw(nargv), udata.u_name, 8);
memcpy(udata.u_ptab->p_name, udata.u_name, 8);
tmpfree(abuf);
tmpfree(ebuf);
i_deref(ino);
/* Shove argc and the address of argv just below envp
FIXME: should flip them in crt0.S of app for R2L setups
so we can get rid of the ifdefs */
#ifdef CONFIG_CALL_R2L /* Arguments are stacked the 'wrong' way around */
uputw((uint16_t) nargv, nenvp - 2);
uputw((uint16_t) argc, nenvp - 1);
#else
uputw((uint16_t) nargv, nenvp - 1);
uputw((uint16_t) argc, nenvp - 2);
#endif
/* Set stack pointer for the program */
udata.u_isp = nenvp - 2;
/* Start execution (never returns) */
udata.u_ptab->p_status = P_RUNNING;
doexec(progload);
/* tidy up in various failure modes */
nogood4:
/* Must not run userspace */
ssig(udata.u_ptab, SIGKILL);
nogood3:
udata.u_ptab->p_status = P_RUNNING;
tmpfree(abuf);
tmpfree(ebuf);
nogood2:
nogood:
i_unlock_deref(ino);
return (-1);
}
int tty_ioctl(uint8_t minor, uarg_t request, char *data)
{ /* Data in User Space */
struct tty *t;
if (minor > NUM_DEV_TTY + 1) {
udata.u_error = ENODEV;
return -1;
}
t = &ttydata[minor];
if (t->flag & TTYF_DEAD) {
udata.u_error = ENXIO;
return -1;
}
jobcontrol_in(minor, t);
switch (request) {
case TCGETS:
return uput(&t->termios, data, sizeof(struct termios));
break;
case TCSETSF:
clrq(&ttyinq[minor]);
/* Fall through for now */
case TCSETSW:
/* We don't have an output queue really so for now drop
through */
case TCSETS:
if (uget(data, &t->termios, sizeof(struct termios)) == -1)
return -1;
tty_setup(minor);
break;
case TIOCINQ:
return uput(&ttyinq[minor].q_count, data, 2);
case TIOCFLUSH:
clrq(&ttyinq[minor]);
break;
case TIOCHANGUP:
tty_hangup(minor);
return 0;
case TIOCOSTOP:
t->flag |= TTYF_STOP;
break;
case TIOCOSTART:
t->flag &= ~TTYF_STOP;
break;
case TIOCGWINSZ:
return uput(&t->winsize, data, sizeof(struct winsize));
case TIOCSWINSZ:
if (uget(&t->winsize, data, sizeof(struct winsize)))
return -1;
sgrpsig(t->pgrp, SIGWINCH);
return 0;
case TIOCGPGRP:
return uputw(t->pgrp, data);
#ifdef CONFIG_LEVEL_2
case TIOCSPGRP:
/* Only applicable via controlling terminal */
if (minor != udata.u_ptab->p_tty) {
udata.u_error = ENOTTY;
return -1;
}
return tcsetpgrp(t, data);
#endif
default:
udata.u_error = ENOTTY;
return -1;
}
return 0;
}
static uint8_t pushw(uint16_t **usp, uint16_t v)
{
(*usp)--;
return uputw(v, *usp);
}
