diff options
Diffstat (limited to 'sys/kern/kern_exec.c')
| -rw-r--r-- | sys/kern/kern_exec.c | 240 |
1 files changed, 0 insertions, 240 deletions
diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c deleted file mode 100644 index 202da23..0000000 --- a/sys/kern/kern_exec.c +++ /dev/null @@ -1,240 +0,0 @@ -/* - * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * 1. Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of Hyra nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" - * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE - * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR - * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF - * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN - * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - */ - -#include <sys/sched.h> -#include <sys/system.h> -#include <sys/errno.h> -#include <sys/vfs.h> -#include <sys/exec.h> -#include <sys/filedesc.h> -#include <sys/signal.h> -#include <sys/loader.h> -#include <sys/cdefs.h> -#include <vm/dynalloc.h> -#include <sys/syslog.h> -#include <string.h> - -__MODULE_NAME("exec"); -__KERNEL_META("$Hyra$: kern_exec.c, Ian Marco Moffett, " - "exec() implementation"); - -#define ARG_MAX 1024 - -/* - * Allocates a buffer in in `res' and fetches - * the args from `argv' - * - * @argv: User argv - * @res: Exec args result. - * - * XXX: res->argp is dynamically allocated, remember - * to free it! - */ -static int -exec_get_args(char **argv, struct exec_args *res) -{ - static char *dmmy_envp[] = {NULL}; - const size_t ARG_LEN = sizeof(char) * ARG_MAX; - char *argp = NULL; - void *tmp; - - struct proc *td; - size_t argp_len = 0; - - if (res == NULL) - return -EINVAL; - - /* Allocate argp */ - res->argp = dynalloc(ARG_LEN); - if (res->argp == NULL) - return -ENOMEM; - - td = this_td(); - res->vas = td->addrsp; - res->envp = dmmy_envp; - - /* Read argv */ - copyin((uintptr_t)argv, &argp, sizeof(char *)); - for (;;) { - if (argp == NULL) { - res->argp[argp_len] = NULL; - break; - } - - /* Fetch this arg and get next argp */ - copyinstr((uintptr_t)argp, res->argp[argp_len++], ARG_MAX); - copyin((uintptr_t)++argv, &argp, sizeof(char *)); - - /* Try to resize the argp buffer */ - tmp = dynrealloc(res->argp, ARG_LEN * (argp_len + 1)); - if (tmp == NULL) { - dynfree(res->argp); - return -ENOMEM; - } - res->argp = tmp; - } - - return 0; -} - -/* - * Reset the stack of the process. - * - * @td: Target thread. - * @args: Exec args. - * - * Returns the new stack pointer. - */ -static uintptr_t -exec_set_stack(struct proc *td, struct exec_args args) -{ - struct vm_range *stack_range; - uintptr_t stack_top, sp; - - stack_range = &td->addr_range[ADDR_RANGE_STACK]; - stack_top = stack_range->start + (PROC_STACK_SIZE); - - sp = loader_init_stack((void *)stack_top, args); - return sp; -} - -/* - * execv() implementation. - * - * @pathname: Path of file to execute. - * @argv: Args. - * @sp_res: Pointer to new stack pointer - */ -static int -execv(char *pathname, char **argv, uintptr_t *sp_res) -{ - char *bin = NULL; - struct filedesc *filedes; - struct vm_range *exec_range; - struct exec_args args; - - struct proc *td = this_td(); - int fd, ret = 0; - int status; - size_t bin_size; - - if ((status = exec_get_args(argv, &args)) != 0) - return status; - - spinlock_acquire(&td->lock); - fd = open(pathname, O_RDONLY); - - if (fd < 0) { - ret = -ENOENT; - goto done; - } - - filedes = fd_from_fdnum(td, fd); - if (__unlikely(filedes == NULL)) { - /* - * Should not happen. The kernel might be in some - * erroneous state. - */ - ret = -EIO; - goto done; - } - - lseek(fd, 0, SEEK_END); - bin_size = filedes->offset; - lseek(fd, 0, SEEK_SET); - - /* Allocate memory for the binary */ - bin = dynalloc(bin_size); - if (bin == NULL) { - ret = -ENOMEM; - goto done; - } - - /* Read-in the binary */ - if ((status = read(fd, bin, bin_size)) < 0) { - ret = status; - goto done; - } - - /* - * Unload the current process image. After we do this, - * we cannot return in this state until we replace it. - * - * XXX: This is one of the last things we do in case of - * errors. - */ - exec_range = &td->addr_range[ADDR_RANGE_EXEC]; - loader_unload(td->addrsp, exec_range); - - /* - * Now we try to load the new program and hope everything - * works... If something goes wrong here then we'll be forced - * to send a SIGSEGV to the thread. - */ - status = loader_load(td->addrsp, bin, &args.auxv, 0, NULL, exec_range); - if (status != 0) { - /* Well shit */ - kprintf("exec: Failed to load new process image\n"); - signal_raise(td, SIGSEGV); - for (;;); - } - - *sp_res = exec_set_stack(td, args); - set_frame_ip(td->tf, args.auxv.at_entry); -done: - /* We are done, cleanup and release the thread */ - if (bin != NULL) dynfree(bin); - fd_close_fdnum(td, fd); - dynfree(args.argp); - spinlock_release(&td->lock); - return ret; -} - -/* - * Arg0: Pathname - * Arg1: Argv - */ -uint64_t -sys_execv(struct syscall_args *args) -{ - uintptr_t sp; - char pathname[PATH_MAX]; - char **argv = (char **)args->arg1; - - int status; - struct proc *td = this_td(); - - copyinstr(args->arg0, pathname, PATH_MAX); - if ((status = execv(pathname, argv, &sp)) != 0) - return status; - - args->ip = get_frame_ip(td->tf); - args->sp = sp; - return 0; -} |