diff options
Diffstat (limited to 'ldso/ldso/ldso.c')
| -rw-r--r-- | ldso/ldso/ldso.c | 128 |
1 files changed, 123 insertions, 5 deletions
diff --git a/ldso/ldso/ldso.c b/ldso/ldso/ldso.c index ea4ad0f1c..bb394714f 100644 --- a/ldso/ldso/ldso.c +++ b/ldso/ldso/ldso.c @@ -70,8 +70,18 @@ char *_dl_debug_bindings = NULL; int _dl_debug_file = 2; #endif -/* Needed for standalone execution. */ +#if defined (__LDSO_STANDALONE_SUPPORT__) && defined (__sh__) +/* Not hidden, needed for standalone execution. */ +/* + * FIXME: align dl_start for SH to other archs so that we can keep this symbol + * hidden and we don't need to handle in __uClibc_main + */ + +unsigned long _dl_skip_args = 0; +#else unsigned long attribute_hidden _dl_skip_args = 0; +#endif + const char *_dl_progname = UCLIBC_LDSO; /* The name of the executable being run */ #include "dl-startup.c" #include "dl-symbols.c" @@ -274,9 +284,8 @@ static void __attribute__ ((destructor)) __attribute_used__ _dl_fini(void) } } -void _dl_get_ready_to_run(struct elf_resolve *tpnt, DL_LOADADDR_TYPE load_addr, - ElfW(auxv_t) auxvt[AT_EGID + 1], char **envp, - char **argv +void *_dl_get_ready_to_run(struct elf_resolve *tpnt, DL_LOADADDR_TYPE load_addr, + ElfW(auxv_t) auxvt[AT_EGID + 1], char **envp, char **argv DL_GET_READY_TO_RUN_EXTRA_PARMS) { ElfW(Addr) app_mapaddr = 0; @@ -327,10 +336,12 @@ void _dl_get_ready_to_run(struct elf_resolve *tpnt, DL_LOADADDR_TYPE load_addr, _dl_progname = argv[0]; } +#ifndef __LDSO_STANDALONE_SUPPORT__ if (_start == (void *) auxvt[AT_ENTRY].a_un.a_val) { - _dl_dprintf(_dl_debug_file, "Standalone execution is not supported yet\n"); + _dl_dprintf(_dl_debug_file, "Standalone execution is not enabled\n"); _dl_exit(1); } +#endif /* Start to build the tables of the modules that are required for * this beast to run. We start with the basic executable, and then @@ -382,6 +393,102 @@ void _dl_get_ready_to_run(struct elf_resolve *tpnt, DL_LOADADDR_TYPE load_addr, _dl_init_static_tls = &_dl_nothread_init_static_tls; #endif +#ifdef __LDSO_STANDALONE_SUPPORT__ + if (_start == (void *) auxvt[AT_ENTRY].a_un.a_val) { + char *ptmp; + unsigned int *aux_dat = (unsigned int *) argv; + int argc = aux_dat[-1]; + + tpnt->libname = argv[0]; + while (argc > 1) + if (! _dl_strcmp (argv[1], "--library-path") && argc > 2) { + _dl_library_path = argv[2]; + _dl_skip_args += 2; + argc -= 2; + argv += 2; + } else + break; + + /* + * If we have no further argument the program was called incorrectly. + * Grant the user some education. + */ + + if (argc < 2) { + _dl_dprintf(1, "\ +Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\ +You have invoked `ld.so', the helper program for shared library executables.\n\ +This program usually lives in the file `/lib/ld.so', and special directives\n\ +in executable files using ELF shared libraries tell the system's program\n\ +loader to load the helper program from this file. This helper program loads\n\ +the shared libraries needed by the program executable, prepares the program\n\ +to run, and runs it. You may invoke this helper program directly from the\n\ +command line to load and run an ELF executable file; this is like executing\n\ +that file itself, but always uses this helper program from the file you\n\ +specified, instead of the helper program file specified in the executable\n\ +file you run. This is mostly of use for maintainers to test new versions\n\ +of this helper program; chances are you did not intend to run this program.\n\ +\n\ + --library-path PATH use given PATH instead of content of the environment\n\ + variable LD_LIBRARY_PATH\n"); + _dl_exit(1); + } + + ++_dl_skip_args; + ++argv; + _dl_progname = argv[0]; + + _dl_symbol_tables = rpnt = _dl_zalloc(sizeof(struct dyn_elf)); + /* + * It needs to load the _dl_progname and to map it + * Usually it is the main application launched by means of the ld.so + * but it could be also a shared object (when ld.so used for tracing) + * We keep the misleading app_tpnt name to avoid variable pollution + */ + app_tpnt = _dl_load_elf_shared_library(_dl_secure, &rpnt, _dl_progname); + if (!app_tpnt) { + _dl_dprintf(_dl_debug_file, "can't load '%s'\n", _dl_progname); + _dl_exit(16); + } + /* + * FIXME: it needs to properly handle a PIE executable + * Usually for a main application, loadaddr is computed as difference + * between auxvt entry points and phdr, so if it is not 0, that it is a + * PIE executable. In this case instead we need to set the loadaddr to 0 + * because we are actually mapping the ELF for the main application by + * ourselves. So the PIE case must be checked. + */ + + app_tpnt->rtld_flags = unlazy | RTLD_GLOBAL; + + if (app_tpnt->libtype == elf_executable) + app_tpnt->loadaddr = 0; + + /* + * This is used by gdb to locate the chain of shared libraries that are + * currently loaded. + */ + debug_addr = _dl_zalloc(sizeof(struct r_debug)); + ppnt = (ElfW(Phdr) *)app_tpnt->ppnt; + for (i = 0; i < app_tpnt->n_phent; i++, ppnt++) { + if (ppnt->p_type == PT_DYNAMIC) { + dpnt = (ElfW(Dyn) *) DL_RELOC_ADDR(app_tpnt->loadaddr, ppnt->p_vaddr); + _dl_parse_dynamic_info(dpnt, app_tpnt->dynamic_info, debug_addr, app_tpnt->loadaddr); + } + } + + /* Store the path where the shared lib loader was found + * for later use + */ + _dl_ldsopath = _dl_strdup(tpnt->libname); + ptmp = _dl_strrchr(_dl_ldsopath, '/'); + if (ptmp != _dl_ldsopath) + *ptmp = '\0'; + + _dl_debug_early("Lib Loader: (%x) %s\n", (unsigned) DL_LOADADDR_BASE(tpnt->loadaddr), tpnt->libname); + } else { +#endif + /* At this point we are now free to examine the user application, * and figure out which libraries are supposed to be called. Until * we have this list, we will not be completely ready for dynamic @@ -538,6 +645,10 @@ void _dl_get_ready_to_run(struct elf_resolve *tpnt, DL_LOADADDR_TYPE load_addr, } #endif +#ifdef __LDSO_STANDALONE_SUPPORT__ + } /* ! ldso standalone mode */ +#endif + #ifdef __SUPPORT_LD_DEBUG__ _dl_debug = _dl_getenv("LD_DEBUG", envp); if (_dl_debug) { @@ -1084,6 +1195,13 @@ void _dl_get_ready_to_run(struct elf_resolve *tpnt, DL_LOADADDR_TYPE load_addr, /* Notify the debugger that all objects are now mapped in. */ _dl_debug_addr->r_state = RT_CONSISTENT; _dl_debug_state(); + +#ifdef __LDSO_STANDALONE_SUPPORT__ + if (_start == (void *) auxvt[AT_ENTRY].a_un.a_val) + return (void *) app_tpnt->l_entry; + else +#endif + return (void *) auxvt[AT_ENTRY].a_un.a_val; } #include "dl-hash.c" |