diff options
Diffstat (limited to 'serverboot/load.c')
| -rw-r--r-- | serverboot/load.c | 406 |
1 files changed, 406 insertions, 0 deletions
diff --git a/serverboot/load.c b/serverboot/load.c new file mode 100644 index 00000000..9a3e3b98 --- /dev/null +++ b/serverboot/load.c @@ -0,0 +1,406 @@ +/* + * Mach Operating System + * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University + * All Rights Reserved. + * + * Permission to use, copy, modify and distribute this software and its + * documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" + * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR + * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * Carnegie Mellon requests users of this software to return to + * + * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU + * School of Computer Science + * Carnegie Mellon University + * Pittsburgh PA 15213-3890 + * + * any improvements or extensions that they make and grant Carnegie Mellon + * the rights to redistribute these changes. + */ + +#include <assert.h> +#include <mach/mach_interface.h> +#include <varargs.h> +#include <mach/exec/exec.h> +#include "../boot/boot_script.h" + +#include <file_io.h> + + +boolean_t load_protect_text = TRUE; + + +struct stuff +{ + struct file *fp; + task_t user_task; + + vm_offset_t aout_symtab_ofs; + vm_size_t aout_symtab_size; + vm_offset_t aout_strtab_ofs; + vm_size_t aout_strtab_size; +}; + +char *set_regs( + mach_port_t user_task, + mach_port_t user_thread, + struct exec_info *info, + int arg_size); + +static void read_symtab_from_file( + struct file *fp, + mach_port_t host_port, + task_t task, + char * symtab_name, + struct stuff *st); + +/* Callback functions for reading the executable file. */ +static int prog_read(void *handle, vm_offset_t file_ofs, void *buf, vm_size_t size, + vm_size_t *out_actual) +{ + struct stuff *st = handle; + vm_size_t resid; + int result; + + result = read_file(st->fp, file_ofs, buf, size, &resid); + if (result) + return result; + *out_actual = size - resid; + return 0; +} + +static int prog_read_exec(void *handle, vm_offset_t file_ofs, vm_size_t file_size, + vm_offset_t mem_addr, vm_size_t mem_size, + exec_sectype_t sec_type) +{ + struct stuff *st = handle; + vm_offset_t page_start = trunc_page(mem_addr); + vm_offset_t page_end = round_page(mem_addr + mem_size); + vm_prot_t mem_prot = sec_type & EXEC_SECTYPE_PROT_MASK; + vm_offset_t area_start; + int result; + + if (sec_type & EXEC_SECTYPE_AOUT_SYMTAB) + { + st->aout_symtab_ofs = file_ofs; + st->aout_symtab_size = file_size; + } + if (sec_type & EXEC_SECTYPE_AOUT_STRTAB) + { + st->aout_strtab_ofs = file_ofs; + st->aout_strtab_size = file_size; + } + + if (!(sec_type & EXEC_SECTYPE_ALLOC)) + return 0; + + assert(mem_size > 0); + assert(mem_size > file_size); + + /* + printf("section %08x-%08x-%08x prot %08x (%08x-%08x)\n", + mem_addr, mem_addr+file_size, mem_addr+mem_size, mem_prot, page_start, page_end); + */ + + result = vm_allocate(mach_task_self(), &area_start, page_end - page_start, TRUE); + if (result) return (result); + + if (file_size > 0) + { + vm_size_t resid; + + result = read_file(st->fp, file_ofs, area_start + (mem_addr - page_start), + file_size, &resid); + if (result) return result; + if (resid) return EX_CORRUPT; + } + + if (mem_size > file_size) + { + bzero((void*)area_start + (mem_addr + file_size - page_start), + mem_size - file_size); + } + + result = vm_allocate(st->user_task, &page_start, page_end - page_start, FALSE); + if (result) return (result); + assert(page_start == trunc_page(mem_addr)); + + result = vm_write(st->user_task, page_start, area_start, page_end - page_start); + if (result) return (result); + + result = vm_deallocate(mach_task_self(), area_start, page_end - page_start); + if (result) return (result); + + /* + * Protect the segment. + */ + if (load_protect_text && (mem_prot != VM_PROT_ALL)) { + result = vm_protect(st->user_task, page_start, page_end - page_start, + FALSE, mem_prot); + if (result) return (result); + } + + return 0; +} + +mach_port_t boot_script_read_file (const char *file) +{ return MACH_PORT_NULL; } /* XXX */ + +int +boot_script_exec_cmd (task_t user_task, + char *file_name, + int arg_count, char **argv, + char *argstrings, int argslen) +{ + extern mach_port_t bootstrap_master_device_port, bootstrap_master_host_port; + extern char *root_name; + int arg_len = argslen; + char *arg_pos; + + kern_return_t result; + thread_t user_thread; + struct file file; + char namebuf[MAXPATHLEN+1]; + + struct stuff st; + struct exec_info info; + + extern char * strbuild(); + + if (strcmp (file_name, "/dev/")) + (void) strbuild(namebuf, "/dev/", root_name, "/", file_name, + (char *)0); + else + strcpy (namebuf, file_name); + + /* + * Open the file + */ + bzero((char *)&file, sizeof(file)); + + result = open_file(bootstrap_master_device_port, namebuf, &file); + if (result != 0) { + panic("openi %d", result); + } + + /* + * Add space for: + * arg_count + * pointers to arguments + * trailing 0 pointer + * dummy 0 pointer to environment variables + * and align to integer boundary + */ + arg_len += sizeof(integer_t) + (2 + arg_count) * sizeof(char *); + arg_len = (arg_len + (sizeof(integer_t) - 1)) & ~(sizeof(integer_t)-1); + + /* + * We refrain from checking IEXEC bits to make + * things a little easier when things went bad. + * Say you have ftp(1) but chmod(1) is gone. + */ + if (!file_is_regular(&file)) + panic("boot_load_program: %s is not a regular file", namebuf); + + /* + * Load the executable file. + */ + st.fp = &file; + st.user_task = user_task; + st.aout_symtab_size = 0; + st.aout_strtab_size = 0; + result = exec_load(prog_read, prog_read_exec, &st, &info); + if (result) + panic("(bootstrap) exec_load %s: error %d", namebuf, result); +#if 0 + printf("(bootstrap): loaded %s; entrypoint %08x\n", namebuf, info.entry); +#endif + + /* + * Set up the stack and user registers. + */ + result = thread_create (user_task, &user_thread); + if (result) + panic ("can't create user thread for %s: %x", namebuf, result); + arg_pos = set_regs(user_task, user_thread, &info, arg_len); + + /* + * Read symbols from the executable file. + */ +#if 0 + printf("(bootstrap): loading symbols from %s\n", namebuf); + read_symtab_from_file(&file, bootstrap_master_host_port, user_task, namebuf, &st); +#endif + + /* + * Copy out the arguments. + */ + { + vm_offset_t u_arg_start; + /* user start of argument list block */ + vm_offset_t k_arg_start; + /* kernel start of argument list block */ + vm_offset_t u_arg_page_start; + /* user start of args, page-aligned */ + vm_size_t arg_page_size; + /* page_aligned size of args */ + vm_offset_t k_arg_page_start; + /* kernel start of args, page-aligned */ + + register + char ** k_ap; /* kernel arglist address */ + char * u_cp; /* user argument string address */ + register + char * k_cp; /* kernel argument string address */ + register + int i; + + /* + * Get address of argument list in user space + */ + u_arg_start = (vm_offset_t)arg_pos; + + /* + * Round to page boundaries, and allocate kernel copy + */ + u_arg_page_start = trunc_page(u_arg_start); + arg_page_size = (vm_size_t)(round_page(u_arg_start + arg_len) + - u_arg_page_start); + + result = vm_allocate(mach_task_self(), + &k_arg_page_start, + (vm_size_t)arg_page_size, + TRUE); + if (result) + panic("boot_load_program: arg size"); + + /* + * Set up addresses corresponding to user pointers + * in the kernel block + */ + k_arg_start = k_arg_page_start + (u_arg_start - u_arg_page_start); + + k_ap = (char **)k_arg_start; + + /* + * Start the strings after the arg-count and pointers + */ + u_cp = (char *)u_arg_start + arg_count * sizeof(char *) + + 2 * sizeof(char *) + + sizeof(integer_t); + k_cp = (char *)k_arg_start + arg_count * sizeof(char *) + + 2 * sizeof(char *) + + sizeof(integer_t); + + /* + * first the argument count + */ + *k_ap++ = (char *)arg_count; + + /* + * Then the strings and string pointers for each argument + */ + for (i = 0; i < arg_count; i++) + *k_ap++ = argv[i] - argstrings + u_cp; + bcopy (argstrings, k_cp, argslen); + + /* + * last, the trailing 0 argument and a null environment pointer. + */ + *k_ap++ = (char *)0; + *k_ap = (char *)0; + + /* + * Now write all of this to user space. + */ + (void) vm_write(user_task, + u_arg_page_start, + k_arg_page_start, + arg_page_size); + + (void) vm_deallocate(mach_task_self(), + k_arg_page_start, + arg_page_size); + } + + /* + * Close the file. + */ + close_file(&file); + + /* Resume the thread. */ + thread_resume (user_thread); + mach_port_deallocate (mach_task_self (), user_thread); + + return (0); +} + +/* + * Load symbols from file into kernel debugger. + */ +static void read_symtab_from_file( + struct file *fp, + mach_port_t host_port, + task_t task, + char * symtab_name, + struct stuff *st) +{ + vm_size_t resid; + kern_return_t result; + vm_size_t table_size; + vm_offset_t symtab; + +#if 0 + + if (!st->aout_symtab_size || !st->aout_strtab_size) + return; + + /* + * Allocate space for the symbol table. + */ + table_size = sizeof(vm_size_t) + + st->aout_symtab_size + + st->aout_strtab_size; + result= vm_allocate(mach_task_self(), + &symtab, + table_size, + TRUE); + if (result) { + printf("[ error %d allocating space for %s symbol table ]\n", + result, symtab_name); + return; + } + + /* + * Set the symbol table length word, + * then read in the symbol table and string table. + */ + *(vm_size_t*)symtab = st->aout_symtab_size; + result = read_file(fp, st->aout_symtab_ofs, + symtab + sizeof(vm_size_t), + st->aout_symtab_size + st->aout_strtab_size, + &resid); + if (result || resid) { + printf("[ no valid symbol table present for %s ]\n", + symtab_name); + } + else { + /* + * Load the symbols into the kernel. + */ + result = host_load_symbol_table( + host_port, + task, + symtab_name, + symtab, + table_size); + } + (void) vm_deallocate(mach_task_self(), symtab, table_size); +#endif +} |