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- /* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
- /* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */
- /* Copyright (C) 2014 OSCAR lab, Stony Brook University
- This file is part of Graphene Library OS.
- Graphene Library OS is free software: you can redistribute it and/or
- modify it under the terms of the GNU General Public License
- as published by the Free Software Foundation, either version 3 of the
- License, or (at your option) any later version.
- Graphene Library OS is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- /*
- * db_main.c
- *
- * This file contains the main function of the PAL loader, which loads and
- * processes environment, arguments and manifest.
- */
- #include "pal_defs.h"
- #include "pal.h"
- #include "pal_internal.h"
- #include "pal_debug.h"
- #include "pal_error.h"
- #include "api.h"
- #include <sysdeps/generic/ldsodefs.h>
- #include <elf/elf.h>
- #include <bits/dlfcn.h>
- PAL_CONTROL __pal_control;
- PAL_CONTROL * pal_control_addr (void)
- {
- return &__pal_control;
- }
- struct pal_internal_state pal_state;
- static void load_libraries (void)
- {
- /* we will not make any assumption for where the libraries are loaded */
- char cfgbuf[CONFIG_MAX];
- int len, ret = 0;
- /* loader.preload:
- any other libraries to preload. The can be multiple URIs,
- seperated by commas */
- len = get_config(pal_state.root_config, "loader.preload", cfgbuf,
- CONFIG_MAX);
- if (len <= 0)
- return;
- char * c = cfgbuf, * library_name = c;
- for (;; c++)
- if (*c == ',' || !(*c)) {
- if (c > library_name) {
- #if PROFILING == 1
- unsigned long before_load_library = _DkSystemTimeQuery();
- #endif
- *c = 0;
- if ((ret = load_elf_object(library_name, OBJECT_PRELOAD)) < 0)
- init_fail(-ret, "Unable to load preload library");
- #if PROFILING == 1
- pal_state.linking_time +=
- _DkSystemTimeQuery() - before_load_library;
- #endif
- }
- if (c == cfgbuf + len)
- break;
- library_name = c + 1;
- }
- }
- static void read_envs (const char *** envpp)
- {
- const char ** envp = *envpp;
- char cfgbuf[CONFIG_MAX];
- /* loader.env.* and loader.exclude.env: filtering host environment
- * variables */
- struct env {
- const char * str;
- int len, idx;
- } * envs = NULL;
- int nenvs = 0;
- if (pal_state.root_config)
- nenvs = get_config_entries(pal_state.root_config, "loader.env",
- cfgbuf, CONFIG_MAX);
- if (nenvs > 0) {
- envs = __alloca(sizeof(struct env) * nenvs);
- char * cfg = cfgbuf;
- for (int i = 0 ; i < nenvs ; i++) {
- int len = strlen(cfg);
- char * str = __alloca(len + 1);
- envs[i].str = str;
- envs[i].len = len;
- envs[i].idx = -1;
- memcpy(str, cfg, len + 1);
- cfg += len + 1;
- }
- }
- int envc = 0, add = nenvs;
- for (const char ** e = envp ; *e ; e++) {
- const char * s = *e, * p = s;
- envc++;
- while (*p && *p != '=')
- p++;
- int l = p - s;
- const char * v = p + 1;
- if (l > 8 &&
- s[0] == 'P' && s[1] == 'A' && s[2] == 'L' && s[3] == '_' &&
- s[4] == 'L' && s[5] == 'O' && s[6] == 'G' && s[7] == '_') {
- /* PAL_LOG_STREAM = */
- if (l == 14 && s[8] == 'S' && s[9] == 'T' &&
- s[10] == 'R' && s[11] == 'E' && s[12] == 'A' && s[13] == 'M') {
- PAL_HANDLE log;
- if (!_DkStreamOpen(&log, v, PAL_ACCESS_APPEND,
- PAL_SHARE_OWNER_R|PAL_SHARE_OWNER_W,
- PAL_CREAT_TRY, 0)) {
- if (pal_state.log_stream)
- _DkObjectClose(pal_state.log_stream);
- pal_state.log_stream = log;
- }
- }
- /* PAL_LOG_TYPES = */
- if (l == 13 && s[8] == 'T' && s[9] == 'Y' &&
- s[10] == 'P' && s[11] == 'E' && s[12] == 'S') {
- const char * t = v, * n;
- while (*t) {
- for (n = t ; *n && *n != ',' ; n++);
- switch (n - t) {
- case 4:
- if (t[0] == 'f' && t[1] == 'i' && t[2] == 'l' &&
- t[3] == 'e')
- pal_state.log_types |= LOG_FILE;
- if (t[0] == 'p' && t[1] == 'i' && t[2] == 'p' &&
- t[3] == 'e')
- pal_state.log_types |= LOG_PIPE;
- break;
- case 6:
- if (t[0] == 's' && t[1] == 'o' && t[2] == 'c' &&
- t[3] == 'k' && t[4] == 'e' && t[5] == 't')
- pal_state.log_types |= LOG_SOCKET;
- break;
- }
- t = *n ? n + 1 : n;
- }
- }
- continue;
- }
- for (int i = 0 ; i < nenvs ; i++)
- if (envs[i].len == l && !memcmp(envs[i].str, s, l)) {
- envs[i].idx = envc - 1;
- add--;
- break;
- }
- }
- if (add) {
- const char ** new_envp =
- malloc(sizeof(const char *) * (envc + add + 1));
- memcpy(new_envp, envp, sizeof(const char *) * envc);
- envp = new_envp;
- envp[envc + add] = NULL;
- }
- char key[CONFIG_MAX] = "loader.env.";
- const char ** ptr;
- for (int i = 0 ; i < nenvs ; i++) {
- const char * str = envs[i].str;
- int len = envs[i].len;
- int idx = envs[i].idx;
- int bytes;
- ptr = &envp[(idx == -1) ? envc++ : idx];
- memcpy(key + 11, str, len + 1);
- if ((bytes = get_config(pal_state.root_config, key, cfgbuf,
- CONFIG_MAX)) > 0) {
- char * e = malloc(len + bytes + 2);
- memcpy(e, str, len);
- e[len] = '=';
- memcpy(e + len + 1, cfgbuf, bytes + 1);
- *ptr = e;
- } else {
- char * e = malloc(len + 2);
- memcpy(e, str, len);
- e[len] = '=';
- e[len + 1] = 0;
- *ptr = e;
- }
- }
- *envpp = envp;
- }
- static void set_debug_type (void)
- {
- char cfgbuf[CONFIG_MAX];
- int ret;
- if (!pal_state.root_config)
- return;
- ret = get_config(pal_state.root_config, "loader.debug_type",
- cfgbuf, CONFIG_MAX);
- if (ret <= 0)
- return;
- PAL_HANDLE handle = NULL;
- if (!memcmp(cfgbuf, "inline", 7)) {
- ret = _DkStreamOpen(&handle, "dev:tty", PAL_ACCESS_RDWR, 0, 0, 0);
- if (ret < 0)
- init_fail(-ret, "cannot open debug stream");
- } else if (!memcmp(cfgbuf, "file", 5)) {
- ret = get_config(pal_state.root_config, "loader.debug_file",
- cfgbuf, CONFIG_MAX);
- if (ret <= 0)
- init_fail(PAL_ERROR_INVAL, "debug file not specified");
- ret = _DkStreamOpen(&handle, cfgbuf,
- PAL_ACCESS_RDWR,
- PAL_SHARE_OWNER_R|PAL_SHARE_OWNER_W,
- PAL_CREAT_TRY, 0);
- if (ret < 0)
- init_fail(-ret, "cannot open debug file");
- } else if (memcmp(cfgbuf, "none", 5)) {
- init_fail(PAL_ERROR_INVAL, "unknown debug type");
- }
- __pal_control.debug_stream = handle;
- }
- static void set_syscall_symbol (void)
- {
- char cfgbuf[CONFIG_MAX];
- int ret;
- if (!pal_state.root_config)
- return;
- ret = get_config(pal_state.root_config, "loader.syscall_symbol",
- cfgbuf, CONFIG_MAX);
- if (ret <= 0)
- return;
- pal_state.syscall_sym_name = remalloc(cfgbuf, ret + 1);
- }
- static int loader_filter (const char * key, int len)
- {
- return (key[0] == 'l' && key[1] == 'o' && key[2] == 'a' && key[3] == 'd' &&
- key[4] == 'e' && key[5] == 'r' && key[6] == '.') ? 0 : 1;
- }
- void pal_main (PAL_NUM pal_token, void * pal_addr,
- const char * pal_name,
- int argc, const char ** argv, const char ** envp,
- PAL_HANDLE parent_handle,
- PAL_HANDLE thread_handle,
- PAL_HANDLE exec_handle,
- PAL_HANDLE manifest_handle)
- {
- int ret;
- bool is_parent = !parent_handle;
- #if PROFILING == 1
- __pal_control.host_specific_startup_time =
- _DkSystemTimeQuery() - pal_state.start_time;
- #endif
- pal_state.pal_token = pal_token;
- pal_state.pal_addr = pal_addr;
- pal_state.parent_handle = parent_handle;
- pal_state.pagesize = _DkGetPagesize();
- pal_state.alloc_align = _DkGetAllocationAlignment();
- pal_state.alloc_shift = pal_state.alloc_align - 1;
- pal_state.alloc_mask = ~pal_state.alloc_shift;
- init_slab_mgr(pal_state.alloc_align);
- if (is_parent && !exec_handle && !manifest_handle) {
- printf("USAGE: %s [executable|manifest] args ...\n", pal_name);
- _DkProcessExit(0);
- return;
- }
- char * exec = NULL, * manifest = NULL;
- if (exec_handle) {
- exec = __alloca(URI_MAX);
- ret = _DkStreamGetName(exec_handle, exec, URI_MAX);
- if (ret < 0)
- init_fail(-ret, "cannot get executable name");
- }
- if (manifest_handle) {
- manifest = __alloca(URI_MAX);
- ret = _DkStreamGetName(manifest_handle, manifest, URI_MAX);
- if (ret < 0)
- init_fail(-ret, "cannot get manifest name");
- } else {
- if (is_parent) {
- #if PROFILING == 1
- unsigned long before_find_manifest = _DkSystemTimeQuery();
- #endif
- do {
- assert(!!exec);
- /* try open "<exec>.manifest" */
- manifest = __alloca(URI_MAX);
- snprintf(manifest, URI_MAX, "%s.manifest", exec);
- ret = _DkStreamOpen(&manifest_handle,
- manifest,
- PAL_ACCESS_RDONLY, 0, 0, 0);
- if (!ret)
- break;
- /* try open "file:manifest" */
- manifest = "file:manifest";
- ret = _DkStreamOpen(&manifest_handle,
- manifest,
- PAL_ACCESS_RDONLY, 0, 0, 0);
- if (!ret)
- break;
- /* well, there is no manifest file, leave it alone */
- if (!manifest_handle)
- printf("Can't fine any manifest, will run without one\n");
- } while (0);
- #if PROFILING == 1
- pal_state.manifest_loading_time +=
- _DkSystemTimeQuery() - before_find_manifest;
- #endif
- }
- }
- /* load manifest if there is one */
- if (manifest_handle) {
- #if PROFILING == 1
- unsigned long before_load_manifest = _DkSystemTimeQuery();
- #endif
- PAL_STREAM_ATTR attr;
- ret = _DkStreamAttributesQuerybyHandle(manifest_handle, &attr);
- if (ret < 0)
- init_fail(-ret, "cannot open manifest file");
- void * cfg_addr = NULL;
- int cfg_size = attr.pending_size;
- ret = _DkStreamMap(manifest_handle, &cfg_addr,
- PAL_PROT_READ, 0,
- ALLOC_ALIGNUP(cfg_size));
- if (ret < 0)
- init_fail(-ret, "cannot open manifest file");
- struct config_store * root_config = malloc(sizeof(struct config_store));
- root_config->raw_data = cfg_addr;
- root_config->raw_size = cfg_size;
- root_config->malloc = malloc;
- root_config->free = free;
- const char * errstring = NULL;
- if ((ret = read_config(root_config, loader_filter, &errstring)) < 0)
- init_fail(-ret, errstring);
- pal_state.root_config = root_config;
- #if PROFILING == 1
- pal_state.manifest_loading_time +=
- _DkSystemTimeQuery() - before_load_manifest;
- #endif
- }
- /* if there is no executable, try to find one in the manifest */
- if (is_parent && !exec_handle) {
- exec = __alloca(URI_MAX);
- assert(!!pal_state.root_config);
- ret = get_config(pal_state.root_config, "loader.exec", exec, URI_MAX);
- if (ret > 0) {
- ret = _DkStreamOpen(&exec_handle, exec, PAL_ACCESS_RDONLY,
- 0, 0, 0);
- if (ret < 0)
- init_fail(-ret, "cannot open executable");
- /* must be a ELF */
- if (check_elf_object(exec_handle) < 0)
- init_fail(PAL_ERROR_INVAL, "executable is not a ELF binary");
- } else {
- exec = NULL;
- }
- }
- pal_state.manifest = manifest;
- pal_state.manifest_handle = manifest_handle;
- pal_state.exec = exec;
- pal_state.exec_handle = exec_handle;
- const char * first_argv = *argv;
- argc--;
- argv++;
- if (is_parent && exec) {
- first_argv = exec;
- if (pal_state.root_config) {
- char cfgbuf[CONFIG_MAX];
- ret = get_config(pal_state.root_config, "loader.execname", cfgbuf,
- CONFIG_MAX);
- if (ret > 0)
- first_argv = remalloc(cfgbuf, ret + 1);
- }
- }
- read_envs(&envp);
- if (pal_state.log_stream && (pal_state.log_types & LOG_FILE)) {
- if (manifest)
- log_stream(manifest);
- if (exec)
- log_stream(exec);
- }
- if (pal_state.root_config)
- load_libraries();
- if (exec_handle) {
- #if PROFILING == 1
- unsigned long before_load_exec = _DkSystemTimeQuery();
- #endif
- ret = load_elf_object_by_handle(exec_handle, OBJECT_EXEC);
- if (ret < 0)
- init_fail(ret, PAL_STRERROR(ret));
- #if PROFILING == 1
- pal_state.linking_time += _DkSystemTimeQuery() - before_load_exec;
- #endif
- }
- #if PROFILING == 1
- unsigned long before_tail = _DkSystemTimeQuery();
- #endif
- set_debug_type();
- set_syscall_symbol();
- __pal_control.process_id = _DkGetProcessId();
- __pal_control.host_id = _DkGetHostId();
- __pal_control.manifest_handle = manifest_handle;
- __pal_control.executable = exec;
- __pal_control.parent_process = parent_handle;
- __pal_control.first_thread = thread_handle;
- _DkGetAvailableUserAddressRange(&__pal_control.user_address.start,
- &__pal_control.user_address.end);
- __pal_control.pagesize = pal_state.pagesize;
- __pal_control.alloc_align = pal_state.alloc_align;
- __pal_control.broadcast_stream = _DkBroadcastStreamOpen();
- _DkGetCPUInfo(&__pal_control.cpu_info);
- __pal_control.mem_info.mem_total = _DkMemoryQuota();
- #if PROFILING == 1
- pal_state.tail_startup_time += _DkSystemTimeQuery() - before_tail;
- __pal_control.relocation_time = pal_state.relocation_time;
- __pal_control.linking_time = pal_state.linking_time;
- __pal_control.manifest_loading_time
- = pal_state.manifest_loading_time;
- __pal_control.allocation_time = pal_state.slab_time;
- __pal_control.child_creation_time = is_parent ? 0 : pal_state.start_time -
- pal_state.process_create_time;
- #endif
- /* Now we will start the execution */
- start_execution(first_argv, argc, argv, envp);
- /* We wish we will never reached here */
- init_fail(PAL_ERROR_DENIED, "unexpected termination");
- }
- void write_log (int nstrs, ...)
- {
- const char ** strs = __alloca(sizeof(const char *) * nstrs);
- int len = 0;
- va_list ap;
- va_start(ap, nstrs);
- for (int i = 0 ; i < nstrs ; i++) {
- strs[i] = va_arg(ap, const char *);
- len += strlen(strs[i]);
- }
- va_end(ap);
- char * buf = __alloca(len);
- int cnt = 0;
- for (int i = 0 ; i < nstrs ; i++) {
- int l = strlen(strs[i]);
- memcpy(buf + cnt, strs[i], l);
- cnt += l;
- }
- _DkStreamWrite(pal_state.log_stream, 0, cnt, buf, NULL, 0);
- }
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