/**
* \brief Setup arguments and environment
*
* \param argv Command-line arguments, NULL-terminated
* \param envp Environment, NULL-terminated
*/
static errval_t spawn_setup_env(struct spawninfo *si,
char *const argv[], char *const envp[])
{
errval_t err;
// Create frame (actually multiple pages) for arguments
si->argspg.cnode = si->taskcn;
si->argspg.slot = TASKCN_SLOT_ARGSPAGE;
struct capref spawn_argspg = {
.cnode = si->taskcn,
.slot = TASKCN_SLOT_ARGSPAGE2,
};
err = frame_create(si->argspg, ARGS_SIZE, NULL);
if (err_is_fail(err)) {
return err_push(err, SPAWN_ERR_CREATE_ARGSPG);
}
err = cap_copy(spawn_argspg, si->argspg);
if (err_is_fail(err)) {
return err_push(err, SPAWN_ERR_CREATE_ARGSPG);
}
/* Map in args frame */
genvaddr_t spawn_args_base;
err = spawn_vspace_map_one_frame(si, &spawn_args_base, spawn_argspg, ARGS_SIZE);
if (err_is_fail(err)) {
return err_push(err, SPAWN_ERR_MAP_ARGSPG_TO_NEW);
}
void *argspg;
err = vspace_map_one_frame(&argspg, ARGS_SIZE, si->argspg, NULL, NULL);
if (err_is_fail(err)) {
return err_push(err, SPAWN_ERR_MAP_ARGSPG_TO_SELF);
}
/* Layout of arguments page:
* struct spawn_domain_params; // contains pointers to other fields
* char buf[]; // NUL-terminated strings for arguments and environment
* vspace layout data follows the string data
*/
struct spawn_domain_params *params = argspg;
char *buf = (char *)(params + 1);
size_t buflen = ARGS_SIZE - (buf - (char *)argspg);
/* Copy command-line arguments */
int i;
size_t len;
for (i = 0; argv[i] != NULL; i++) {
len = strlen(argv[i]) + 1;
if (len > buflen) {
return SPAWN_ERR_ARGSPG_OVERFLOW;
}
strcpy(buf, argv[i]);
params->argv[i] = buf - (char *)argspg + (char *)(lvaddr_t)spawn_args_base;
buf += len;
buflen -= len;
}
assert(i <= MAX_CMDLINE_ARGS);
int argc = i;
params->argv[i] = NULL;
/* Copy environment strings */
for (i = 0; envp[i] != NULL; i++) {
len = strlen(envp[i]) + 1;
if (len > buflen) {
return SPAWN_ERR_ARGSPG_OVERFLOW;
}
strcpy(buf, envp[i]);
params->envp[i] = buf - (char *)argspg + (char *)(lvaddr_t)spawn_args_base;
buf += len;
buflen -= len;
}
assert(i <= MAX_ENVIRON_VARS);
params->envp[i] = NULL;
/* Serialise vspace data */
// XXX: align buf to next word
char *vspace_buf = (char *)ROUND_UP((lvaddr_t)buf, sizeof(uintptr_t));
buflen -= vspace_buf - buf;
// FIXME: currently just the pmap is serialised
err = si->vspace->pmap->f.serialise(si->vspace->pmap, vspace_buf, buflen);
if (err_is_fail(err)) {
return err_push(err, SPAWN_ERR_SERIALISE_VSPACE);
}
/* Setup environment pointer and vspace pointer */
params->argc = argc;
params->vspace_buf = (char *)vspace_buf - (char *)argspg
+ (char *)(lvaddr_t)spawn_args_base;
params->vspace_buf_len = buflen;
// Setup TLS data
params->tls_init_base = (void *)vspace_genvaddr_to_lvaddr(si->tls_init_base);
params->tls_init_len = si->tls_init_len;
params->tls_total_len = si->tls_total_len;
arch_registers_state_t *enabled_area =
dispatcher_get_enabled_save_area(si->handle);
registers_set_param(enabled_area, (uintptr_t)spawn_args_base);
return SYS_ERR_OK;
}
/**
* Copies caps from inheritcnode into destination cnode,
* ignores caps that to not exist.
*
* \param inheritcn Source cnode
* \param inherit_slot Source cnode slot
* \param destcn Target cnode
* \param destcn_slot Target cnode slot
*
* \retval SYS_ERR_OK Copy to target was successful or source cap
* did not exist.
* \retval SPAWN_ERR_COPY_INHERITCN_CAP Error in cap_copy
*/
static errval_t spawn_setup_inherited_cap(struct cnoderef inheritcn,
capaddr_t inherit_slot,
struct cnoderef destcn,
capaddr_t destcn_slot)
{
errval_t err;
struct capref src;
src.cnode = inheritcn;
src.slot = inherit_slot;;
// Create frame (actually multiple pages) for fds
struct capref dest;
dest.cnode = destcn;
dest.slot = destcn_slot;
err = cap_copy(dest, src);
if (err_no(err) == SYS_ERR_SOURCE_CAP_LOOKUP) {
// there was no fdcap to inherit, continue
return SYS_ERR_OK;
} else if (err_is_fail(err)) {
return err_push(err, SPAWN_ERR_COPY_INHERITCN_CAP);
}
return SYS_ERR_OK;
}
static struct dcb *spawn_init_common(struct spawn_state *st, const char *name,
int argc, const char *argv[],
lpaddr_t bootinfo_phys,
alloc_phys_func alloc_phys)
{
errval_t err;
/* Perform arch-independent spawn */
lvaddr_t paramaddr;
struct dcb *init_dcb = spawn_module(st, name, argc, argv, bootinfo_phys,
ARGS_BASE, alloc_phys, ¶maddr);
/* Init page tables */
init_page_tables(st, alloc_phys);
/* Map dispatcher R/W into VSpace starting at vaddr 0x204000
* (Starting after Bootinfo pages)*/
#ifdef CONFIG_PAE
paging_x86_32_map_pdpte(&init_pdpte[X86_32_PDPTE_BASE(DISPATCHER_BASE)],
mem_to_local_phys((lvaddr_t)init_pdir));
#endif
paging_x86_32_map_table(&init_pdir[X86_32_PDIR_BASE(DISPATCHER_BASE)],
mem_to_local_phys((lvaddr_t)init_ptable));
for (int i = 0; i < DISPATCHER_SIZE / BASE_PAGE_SIZE; i++) {
paging_x86_32_map(&init_ptable[X86_32_PTABLE_BASE(DISPATCHER_BASE) + i],
mem_to_local_phys(init_dcb->disp) + i * BASE_PAGE_SIZE,
INIT_PAGE_BITMAP | paging_elf_to_page_flags(PF_R | PF_W));
}
struct dispatcher_shared_generic *init_disp =
get_dispatcher_shared_generic(init_dcb->disp);
struct dispatcher_shared_x86_32 *init_disp_x86_32 =
get_dispatcher_shared_x86_32(init_dcb->disp);
registers_set_param(&init_disp_x86_32->enabled_save_area, paramaddr);
// Map IO cap in task cnode
struct cte *iocap = caps_locate_slot(CNODE(st->taskcn), TASKCN_SLOT_IO);
err = caps_create_new(ObjType_IO, 0, 0, 0, my_core_id, iocap);
assert(err_is_ok(err));
/* Set fields in DCB */
// Set Vspace
#ifdef CONFIG_PAE
init_dcb->vspace = mem_to_local_phys((lvaddr_t)init_pdpte);
#else
init_dcb->vspace = mem_to_local_phys((lvaddr_t)init_pdir);
#endif
/* Initialize dispatcher */
init_disp->disabled = true;
strncpy(init_disp->name, argv[0], DISP_NAME_LEN);
/* tell init the vspace addr of its dispatcher */
init_disp->udisp = DISPATCHER_BASE;
init_disp_x86_32->disabled_save_area.edi = DISPATCHER_BASE;
init_disp_x86_32->disabled_save_area.fs = 0;
init_disp_x86_32->disabled_save_area.gs = 0;
init_disp_x86_32->disabled_save_area.cs = USER_CS;
init_disp_x86_32->disabled_save_area.ss = USER_SS;
init_disp_x86_32->disabled_save_area.eflags = USER_EFLAGS;
return init_dcb;
}