#include #include #include #include #include #include #include #include #include #include #include #include extern struct bootinfo *bi; extern coreid_t my_core_id; /** * \brief Set the base address of the .got (Global Offset Table) section of the ELF binary * * \param arch_load_info This must be the base address of the .got section (local to the * child's VSpace). Must not be NULL. * \param handle The handle for the new dispatcher that is to be spawned. Must not be NULL. * \param enabled_area The "resume enabled" register set. Must not be NULL. * \param disabled_area The "resume disabled" register set. Must not be NULL. */ __attribute__((__used__)) static void armv8_set_registers(void *arch_load_info, dispatcher_handle_t handle, arch_registers_state_t *enabled_area, arch_registers_state_t *disabled_area) { assert(arch_load_info != NULL); uintptr_t got_base = (uintptr_t) arch_load_info; struct dispatcher_shared_aarch64 * disp_arm = get_dispatcher_shared_aarch64(handle); disp_arm->got_base = got_base; enabled_area->regs[REG_OFFSET(PIC_REGISTER)] = got_base; disabled_area->regs[REG_OFFSET(PIC_REGISTER)] = got_base; } struct allocate_state { // TODO: add fields struct paging_state *paging_state; }; static errval_t elf_allocate( void *state, genvaddr_t base, size_t size, uint32_t flags, void **ret ) { errval_t err; struct allocate_state *st = state; // Allocate a frame struct capref frame; err = slot_alloc(&frame); if (err_is_fail(err)) return err_push(err, LIB_ERR_SLOT_ALLOC); size_t alloc_bytes; err = frame_create(frame, size, &alloc_bytes); if (err_is_fail(err)) { slot_free(frame); return err_push(err, LIB_ERR_FRAME_ALLOC); } // Map into current address space err = paging_map_frame_attr( get_current_paging_state(), ret, alloc_bytes, frame, VREGION_FLAGS_READ_WRITE ); if (err_is_fail(err)) return err; // TODO: Map into child address space err = paging_map_fixed_attr( st->paging_state, base, frame, alloc_bytes, VREGION_FLAGS_READ_WRITE ); if (err_is_fail(err)) return err; // TODO: Keep track of the mapped regions, so you can unmap them later. return SYS_ERR_OK; } /** * (M2): Implement this function. * \brief Spawn a new dispatcher called 'argv[0]' with 'argc' arguments. * * This function spawns a new dispatcher running the ELF binary called * 'argv[0]' with 'argc' - 1 additional arguments. It fills out 'si' * and 'pid'. * * \param argc The number of command line arguments. Must be > 0. * \param argv An array storing 'argc' command line arguments. * \param si A pointer to the spawninfo struct representing * the child. It will be filled out by this function. Must not be NULL. * \param pid A pointer to a domainid_t variable that will be * assigned to by this function. Must not be NULL. * \return Either SYS_ERR_OK if no error occured or an error * indicating what went wrong otherwise. */ errval_t spawn_load_argv(int argc, char *argv[], struct spawninfo *si, domainid_t *pid) { errval_t err; // - Initialize the spawn_info struct // TODO // - Get the module from the multiboot image // and map it (take a look at multiboot.c) assert(argc > 0); struct mem_region *module = multiboot_find_module(bi, argv[0]); if (module == NULL) return SPAWN_ERR_FIND_MODULE; size_t elf_bytes = module->mrmod_size; // Get the frame of the ELF struct capref child_frame = { .cnode = cnode_module, .slot = module->mrmod_slot, }; struct capability c; err = cap_direct_identify(child_frame, &c); if (err_is_fail(err)) return err; gensize_t frame_size = get_size(&c); if (frame_size < elf_bytes) return SPAWN_ERR_MODULE_FRAME_TOO_SMALL; // Map the ELF into the current address space char *elf_base; err = paging_map_frame_attr( get_current_paging_state(), (void **)&elf_base, frame_size, child_frame, VREGION_FLAGS_READ ); if (err_is_fail(err)) return err_push(err, SPAWN_ERR_MAP_MODULE); debug_printf("SPAWN: mapped %s, size: %"PRIuPTR", magic: %"PRIx8" %c%c%c\n", argv[0], elf_bytes, elf_base[0], elf_base[1], elf_base[2], elf_base[3]); // - Setup the child's cspace // afeer: script page 84/85 err = cnode_create_l1(&si->cspace_l1_cnode_cap, &si->cspace_l1_cnode_info); if (err_is_fail(err)) return err; err = cnode_create_foreign_l2(si->cspace_l1_cnode_cap, ROOTCN_SLOT_TASKCN, &si->cspace_l2_cnode_taskcn); if (err_is_fail(err)) return err; // afeer: (script page 84) is this correct? si->cspace_cap_selfep.cnode = si->cspace_l2_cnode_taskcn; si->cspace_cap_selfep.slot = TASKCN_SLOT_SELFEP; si->cspace_cap_dispatcher.cnode = si->cspace_l2_cnode_taskcn; si->cspace_cap_dispatcher.slot = TASKCN_SLOT_DISPATCHER; si->cspace_cap_rootcn.cnode = si->cspace_l2_cnode_taskcn; si->cspace_cap_rootcn.slot = TASKCN_SLOT_ROOTCN; si->cspace_cap_dispframe.cnode = si->cspace_l2_cnode_taskcn; si->cspace_cap_dispframe.slot = TASKCN_SLOT_DISPFRAME; si->cspace_cap_argspage.cnode = si->cspace_l2_cnode_taskcn; si->cspace_cap_argspage.slot = TASKCN_SLOT_ARGSPAGE; err = cnode_create_foreign_l2(si->cspace_l1_cnode_cap, ROOTCN_SLOT_SLOT_ALLOC0, &si->cspace_l2_cnode_slot_alloc_0); if (err_is_fail(err)) return err; err = cnode_create_foreign_l2(si->cspace_l1_cnode_cap, ROOTCN_SLOT_SLOT_ALLOC1, &si->cspace_l2_cnode_slot_alloc_1); if (err_is_fail(err)) return err; err = cnode_create_foreign_l2(si->cspace_l1_cnode_cap, ROOTCN_SLOT_SLOT_ALLOC2, &si->cspace_l2_cnode_slot_alloc_2); if (err_is_fail(err)) return err; err = cnode_create_foreign_l2(si->cspace_l1_cnode_cap, ROOTCN_SLOT_BASE_PAGE_CN, &si->cspace_l2_cnode_base_pagecn); if (err_is_fail(err)) return err; err = cnode_create_foreign_l2(si->cspace_l1_cnode_cap, ROOTCN_SLOT_PAGECN, &si->cspace_l2_cnode_pagecn); if (err_is_fail(err)) return err; // afeer: populate some capabilities err = dispatcher_create(si->cspace_cap_dispatcher); if (err_is_fail(err)) return err; err = cap_retype(si->cspace_cap_selfep, si->cspace_cap_dispatcher, 0, ObjType_EndPointLMP, 0, 1); if (err_is_fail(err)) return err; // - Setup the child's vspace // afeer: create level 0 page table // the l0 page table is in the first slot of the pagecn cnode. // lower-level pagetables and mappings are stored on different slots of the pagecn cnode. si->vspace_cap_l0_pagetable.cnode = si->cspace_l2_cnode_pagecn; si->vspace_cap_l0_pagetable.slot = PAGECN_SLOT_VROOT; err = vnode_create(si->vspace_cap_l0_pagetable, ObjType_VNode_AARCH64_l0); if (err_is_fail(err)) return err; // rueegges: initialize the foreign paging state struct paging_state child_paging_state; // 64 * 1024 is enough to catch null pointers and also enough to not conflict with child starting paging_alloc at VADDR_OFFSET paging_init_state_foreign(&child_paging_state, 64 * 1024, si->vspace_cap_l0_pagetable, get_default_slot_allocator()); // - Load the ELF binary struct allocate_state st = { .paging_state = &child_paging_state, }; genvaddr_t entry; err = elf_load(EM_AARCH64, elf_allocate, &st, (lvaddr_t)elf_base, elf_bytes, &entry); if (err_is_fail(err)) return err_push(err, SPAWN_ERR_ELF_LOAD); uint64_t got_addr = 0; struct Elf64_Shdr* got_shdr = elf64_find_section_header_name((lvaddr_t)elf_base, elf_bytes, ".got"); if (got_shdr) { got_addr = got_shdr->sh_addr; } // - Setup the dispatcher err = frame_create(si->cspace_cap_dispframe, DISPATCHER_FRAME_SIZE, NULL); if (err_is_fail(err)) { return err_push(err, SPAWN_ERR_CREATE_DISPATCHER_FRAME); } dispatcher_handle_t handle; err = paging_map_frame_attr( get_current_paging_state(), (void **)&handle, DISPATCHER_FRAME_SIZE, si->cspace_cap_dispframe, VREGION_FLAGS_READ_WRITE ); if (err_is_fail(err)) return err; struct dispatcher_shared_generic *disp = get_dispatcher_shared_generic(handle); struct dispatcher_generic *disp_gen = get_dispatcher_generic(handle); arch_registers_state_t *enabled_area = dispatcher_get_enabled_save_area(handle); arch_registers_state_t *disabled_area = dispatcher_get_disabled_save_area(handle); // core id of the process disp_gen->core_id = disp_get_core_id(); // Virtual address of the dispatcher frame in child's VSpace disp->udisp = 0; // TODO // Start in disabled mode disp->disabled = 1; // A name (for debugging) strncpy(disp->name, argv[0], DISP_NAME_LEN); // Set program counter (where it should start to execute) disabled_area->named.pc = entry; // Initialize offset registers // got_addr is the address of the .got in the child's VSpace armv8_set_registers((void *)got_addr, handle, enabled_area, disabled_area); // we won't use error handling frames disp_gen->eh_frame = 0; disp_gen->eh_frame_size = 0; disp_gen->eh_frame_hdr = 0; disp_gen->eh_frame_hdr_size = 0; // TODO: Map dispatcher frame into child address space // - Setup the environment // TODO // - Make the new dispatcher runnable // TODO return LIB_ERR_NOT_IMPLEMENTED; } /** * (M2): Implement this function. * \brief Spawn a new dispatcher executing 'binary_name' * * \param binary_name The name of the binary. * \param si A pointer to a spawninfo struct that will be * filled out by spawn_load_by_name. Must not be NULL. * \param pid A pointer to a domainid_t that will be * filled out by spawn_load_by_name. Must not be NULL. * * \return Either SYS_ERR_OK if no error occured or an error * indicating what went wrong otherwise. */ errval_t spawn_load_by_name(char *binary_name, struct spawninfo * si, domainid_t *pid) { errval_t err; // - Get the mem_region from the multiboot image // TODO // - Fill in argc/argv from the multiboot command line // TODO int argc = 1; char *argv[1]; argv[0] = binary_name; // - Call spawn_load_argv err = spawn_load_argv(argc, argv, si, pid); if (err_is_fail(err)) return err; return SYS_ERR_OK; }