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aos/lib/spawn/spawn.c

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C
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#include <ctype.h>
#include <string.h>
#include <aos/aos.h>
#include <spawn/spawn.h>
#include <elf/elf.h>
#include <aos/dispatcher_arch.h>
#include <aos/lmp_chan.h>
#include <aos/aos_rpc.h>
#include <barrelfish_kpi/paging_arm_v8.h>
#include <barrelfish_kpi/domain_params.h>
#include <spawn/multiboot.h>
#include <spawn/argv.h>
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;
}
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