int
copyoutstr(const void *kaddr, void *udaddr, size_t len, size_t *done)
{
struct pmap *pm = curproc->p_vmspace->vm_map.pmap;
int rv, msr, pid, tmp, ctx;
struct faultbuf env;
if ((rv = setfault(&env))) {
curpcb->pcb_onfault = NULL;
/* XXXX -- len may be lost on a fault */
if (done)
*done = len;
return rv;
}
if (!(ctx = pm->pm_ctx)) {
/* No context -- assign it one */
ctx_alloc(pm);
ctx = pm->pm_ctx;
}
if (len) {
__asm volatile("mtctr %3;" /* Set up counter */
"mfmsr %0;" /* Save MSR */
"li %1,0x20; "
"andc %1,%0,%1; mtmsr %1;" /* Disable IMMU */
"mfpid %1;" /* Save old PID */
"sync; isync;"
"li %3,0;" /* Clear len */
"1:"
"mtpid %1;sync;"
"lbz %2,0(%6); addi %6,%6,1;" /* Store kernel byte */
"sync; isync;"
"mtpid %4; sync;" /* Load user ctx */
"stb %2,0(%5); dcbf 0,%5; addi %5,%5,1;" /* Load byte */
"sync; isync;"
"addi %3,%3,1;" /* Inc len */
"or. %2,%2,%2;"
"bdnzf 2,1b;" /*
* while(ctr-- && !zero)
*/
"mtpid %1; mtmsr %0;" /* Restore PID, MSR */
"sync; isync;"
: "=&r" (msr), "=&r" (pid), "=&r" (tmp), "+b" (len)
: "r" (ctx), "b" (udaddr), "b" (kaddr));
}
curpcb->pcb_onfault = NULL;
if (done)
*done = len;
return 0;
}
/**
* Process input characters to the command system
*
* @param commands Commands container
* @param ctxp Pointer to context for editor (optional)
* @param key Input character
* @param pf Print function
* @param data Application data
*
* @return 0 if success, otherwise errorcode
*/
int cmd_process(struct commands *commands, struct cmd_ctx **ctxp, char key,
struct re_printf *pf, void *data)
{
const struct cmd *cmd;
if (!commands)
return EINVAL;
if (key == KEYCODE_NONE) {
warning("cmd: process: illegal keycode NONE\n");
return EINVAL;
}
/* are we in edit-mode? */
if (ctxp && *ctxp) {
if (key == KEYCODE_REL)
return 0;
return cmd_process_edit(commands, ctxp, key, pf, data);
}
cmd = cmd_find_by_key(commands, key);
if (cmd) {
struct cmd_arg arg;
/* check for parameters */
if (cmd->flags & CMD_PRM) {
int err = 0;
if (ctxp) {
err = ctx_alloc(ctxp, cmd);
if (err)
return err;
}
key = isdigit(key) ? key : KEYCODE_REL;
return cmd_process_edit(commands, ctxp, key, pf, data);
}
arg.key = key;
arg.prm = NULL;
arg.complete = true;
arg.data = data;
return cmd->h(pf, &arg);
}
else if (key == LONG_PREFIX) {
int err;
err = re_hprintf(pf, "%c", LONG_PREFIX);
if (err)
return err;
if (!ctxp) {
warning("cmd: ctxp is required\n");
return EINVAL;
}
err = ctx_alloc(ctxp, cmd);
if (err)
return err;
(*ctxp)->is_long = true;
return 0;
}
else if (key == '\t') {
return cmd_print_all(pf, commands, false, true, NULL, 0);
}
if (key == KEYCODE_REL)
return 0;
return cmd_print(pf, commands);
}
