/**************************************************************************** * binfmt/pcode.c * * Copyright (C) 2014-2018 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 NuttX 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. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pexec.h" #include "pedefs.h" #ifdef CONFIG_BINFMT_PCODE /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Check configuration. This is not all of the configuration settings that * are required -- only the more obvious. */ #if CONFIG_NFILE_DESCRIPTORS < 1 # error You must provide file descriptors via CONFIG_NFILE_DESCRIPTORS in your configuration file #endif #ifdef CONFIG_BINFMT_DISABLE # error The binary loader is disabled (CONFIG_BINFMT_DISABLE)! #endif #ifndef CONFIG_SCHED_ONEXIT # error CONFIG_SCHED_ONEXIT is required #endif #ifndef CONFIG_BINFMT_PCODE_VARSTACKSIZE # define CONFIG_BINFMT_PCODE_VARSTACKSIZE 1024 #endif #ifndef CONFIG_BINFMT_PCODE_STRSTACKSIZE # define CONFIG_BINFMT_PCODE_STRSTACKSIZE 128 #endif #ifdef CONFIG_BINFMT_PCODE_TEST_FS # ifndef CONFIG_FS_ROMFS # error You must select CONFIG_FS_ROMFS in your configuration file # endif # ifdef CONFIG_DISABLE_MOUNTPOINT # error You must not disable mountpoints via CONFIG_DISABLE_MOUNTPOINT in your configuration file # endif # ifndef CONFIG_BINFMT_PCODE_TEST_DEVMINOR # define CONFIG_BINFMT_PCODE_TEST_DEVMINOR 0 # endif # ifndef CONFIG_BINFMT_PCODE_TEST_DEVPATH # define CONFIG_BINFMT_PCODE_TEST_DEVPATH "/dev/ram0" # endif # ifndef CONFIG_BINFMT_PCODE_TEST_MOUNTPOINT # define CONFIG_BINFMT_PCODE_TEST_MOUNTPOINT "/bin" # endif #endif /* Describe the ROMFS file system */ #define SECTORSIZE 512 #define NSECTORS(b) (((b)+SECTORSIZE-1)/SECTORSIZE) /**************************************************************************** * Private Function Prototypes ****************************************************************************/ struct binfmt_handoff_s { sem_t exclsem; /* Supports mutually exclusive access */ FAR struct binary_s *binp; /* Binary format being handed off */ FAR char *fullpath; /* Full path to the P-Code file */ }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ static int pcode_run(FAR char *exepath, size_t varsize, size_t strsize); #ifdef CONFIG_BINFMT_PCODE_TEST_FS static int pcode_mount_testfs(void); #endif #if !defined(CONFIG_BUILD_PROTECTED) && !defined(CONFIG_BUILD_KERNEL) static void pcode_onexit(int exitcode, FAR void *arg); #endif #if !defined(CONFIG_BUILD_PROTECTED) && !defined(CONFIG_BUILD_KERNEL) static int pcode_proxy(int argc, char **argv); #endif static int pcode_load(FAR struct binary_s *binp); static int pcode_unload(FAR struct binary_s *binp); /**************************************************************************** * Private Data ****************************************************************************/ static struct binfmt_s g_pcode_binfmt = { NULL, /* next */ pcode_load, /* load */ pcode_unload, /* unload */ }; struct binfmt_handoff_s g_pcode_handoff; #ifdef CONFIG_BINFMT_PCODE_TEST_FS # include "romfs.h" #endif /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: pcode_run * * Description: * Execute/interpret a P-Code file. This function does not return until * the P-code program terminates or until a fatal error occurs. * * Input Parameters: * exepath - The full path to the P-Code binary. * varsize - Size of the P-Code variable stack * strsize - the size of the P-Code string stack. * * Returned Value: * OK if the P-Code program successfully terminated; A negated errno value * is returned on the event of any failure. * ****************************************************************************/ static int pcode_run(FAR char *exepath, size_t varsize, size_t strsize) { FAR struct pexec_s *st; int errcode; int ret = OK; /* Load the POFF file into memory */ st = pload(exepath, varsize, varsize); if (!st) { berr("ERROR: Could not load %s\n", exepath); return -ENOEXEC; } binfo("Loaded %s\n", exepath); /* Execute the P-Code program until a stopping condition occurs */ for (; ; ) { /* Execute the instruction; Check for exceptional conditions */ errcode = pexec(st); if (errcode != eNOERROR) { break; } } if (errcode != eEXIT) { /* REVISIT: Select a more appropriated return errocode */ berr("ERROR: Runtime error 0x%02x -- Execution Stopped\n", errcode); ret = -ENOEXEC; } /* Clean up resources used by the interpreter */ binfo("Execution terminated\n"); pexec_release(st); return ret; } /**************************************************************************** * Name: pcode_mount_testfs * * Description: * If so configured, then mount the P-Code test file system * ****************************************************************************/ #ifdef CONFIG_BINFMT_PCODE_TEST_FS static int pcode_mount_testfs(void) { int ret; /* Create a ROM disk for the ROMFS filesystem */ binfo("Registering romdisk at /dev/ram%d\n", CONFIG_BINFMT_PCODE_TEST_DEVMINOR); ret = romdisk_register(CONFIG_BINFMT_PCODE_TEST_DEVMINOR, (FAR uint8_t *)romfs_img, NSECTORS(ROMFS_IMG_LEN), SECTORSIZE); if (ret < 0) { berr("ERROR: romdisk_register failed: %d\n", ret); return ret; } /* Mount the test file system */ binfo("Mounting ROMFS filesystem at target=%s with source=%s\n", CONFIG_BINFMT_PCODE_TEST_MOUNTPOINT, CONFIG_BINFMT_PCODE_TEST_DEVPATH); ret = mount(CONFIG_BINFMT_PCODE_TEST_DEVPATH, CONFIG_BINFMT_PCODE_TEST_MOUNTPOINT, "romfs", MS_RDONLY, NULL); if (ret < 0) { int errval = get_errno(); DEBUGASSERT(errval > 0); berr("ERROR: mount(%s,%s,romfs) failed: %d\n", CONFIG_BINFMT_PCODE_TEST_DEVPATH, CONFIG_BINFMT_PCODE_TEST_MOUNTPOINT, errval); return -errval; } /* Does the system support the PATH variable? Has the PATH variable * already been set? If YES and NO, then set the PATH variable to * the ROMFS mountpoint. */ #if defined(CONFIG_BINFMT_EXEPATH) && !defined(CONFIG_PATH_INITIAL) (void)setenv("PATH", CONFIG_BINFMT_PCODE_TEST_MOUNTPOINT, 1); #endif return OK; } #else # define pcode_mount_testfs() (OK) #endif /**************************************************************************** * Name: pcode_onexit * * Description: * This is the proxy program that runs and starts the P-Code interpreter. * ****************************************************************************/ #if !defined(CONFIG_BUILD_PROTECTED) && !defined(CONFIG_BUILD_KERNEL) static void pcode_onexit(int exitcode, FAR void *arg) { FAR struct binary_s *binp = (FAR struct binary_s *)arg; DEBUGASSERT(binp); /* And unload the module */ (void)unload_module(binp); } #endif /**************************************************************************** * Name: pcode_proxy * * Description: * This is the proxy program that runs and starts the P-Code interpreter. * * REVISIT: There are issues here when CONFIG_BUILD_PROTECTED or * CONFIG_BUILD_KERNEL are selected. Also this implementation is too highly * couple to logic in the apps/ directory. * ****************************************************************************/ #if !defined(CONFIG_BUILD_PROTECTED) && !defined(CONFIG_BUILD_KERNEL) static int pcode_proxy(int argc, char **argv) { FAR struct binary_s *binp; FAR char *fullpath; int ret; /* Get the struct binary_s instance from the handoff structure */ binp = g_pcode_handoff.binp; g_pcode_handoff.binp = NULL; fullpath = g_pcode_handoff.fullpath; g_pcode_handoff.fullpath = NULL; nxsem_post(&g_pcode_handoff.exclsem); DEBUGASSERT(binp && fullpath); binfo("Executing %s\n", fullpath); /* Set-up the on-exit handler that will unload the module on exit */ ret = on_exit(pcode_onexit, binp); if (ret < 0) { berr("ERROR: on_exit failed: %d\n", get_errno()); kmm_free(fullpath); return EXIT_FAILURE; } /* Load the P-code file and execute it */ ret = pcode_run(fullpath, CONFIG_BINFMT_PCODE_VARSTACKSIZE, CONFIG_BINFMT_PCODE_STRSTACKSIZE); /* We no longer need the fullpath */ kmm_free(fullpath); /* Check the result of the interpretation */ if (ret < 0) { berr("ERROR: Execution failed\n"); return EXIT_FAILURE; } return EXIT_SUCCESS; } #else # error Missing logic for the case of CONFIG_BUILD_PROTECTED/KERNEL #endif /**************************************************************************** * Name: pcode_load * * Description: * Verify that the file is a pcode binary. * ****************************************************************************/ static int pcode_load(struct binary_s *binp) { FAR struct poff_fileheader_s hdr; FAR uint8_t *ptr; size_t remaining; ssize_t nread; int fd; int ret; binfo("Loading file: %s\n", binp->filename); /* Open the binary file for reading (only) */ fd = nx_open(binp->filename, O_RDONLY); if (fd < 0) { berr("ERROR: Failed to open binary %s: %d\n", binp->filename, fd); return fd; } /* Read the POFF file header */ for (remaining = sizeof(struct poff_fileheader_s), ptr = (FAR uint8_t *)&hdr; remaining > 0; ) { /* Read the next GULP */ nread = nx_read(fd, ptr, remaining); if (nread < 0) { /* If the failure is EINTR, then this is not an error; the * nx_read() was simply interrupted by a signal. */ if (nread != -EINTR) { berr("ERROR: read failed: %d\n", (int)nread); ret = nread; goto errout_with_fd; } berr("Interrupted by a signal\n"); } else { /* Set up for the next gulp */ DEBUGASSERT(nread > 0 && nread <= remaining); remaining -= nread; ptr += nread; } } #ifdef CONFIG_BINFMT_PCODE_DUMPBUFFER lib_dumpbuffer("POFF File Header", &hdr, sizeof(poff_fileheader_s)); #endif /* Verify that the file is a P-Code executable */ if (memcmp(&hdr.fh_ident, FHI_POFF_MAG, 4) != 0 || hdr.fh_type != FHT_EXEC) { _err("ERROR: File is not a P-code executable: %d\n"); ret = -ENOEXEC; goto errout_with_fd; } /* Return the load information. * REVISIT: There are issues here when CONFIG_BUILD_PROTECTED or * CONFIG_BUILD_KERNEL are selected. */ binp->entrypt = pcode_proxy; binp->stacksize = CONFIG_BINFMT_PCODE_STACKSIZE; binp->priority = CONFIG_BINFMT_PCODE_PRIORITY; /* Get exclusive access to the p-code handoff structure */ do { ret = nxsem_wait(&g_pcode_handoff.exclsem); DEBUGASSERT(ret == OK || ret == -EINTR); } while (ret == -EINTR); /* Save the data that we need to handoff to the child thread */ DEBUGASSERT(g_pcode_handoff.binp == NULL && g_pcode_handoff.fullpath == NULL); /* Duplicate the full path to the binary */ g_pcode_handoff.fullpath = strdup(binp->filename); if (!g_pcode_handoff.fullpath) { berr("ERROR: Failed to duplicate the full path: %d\n", binp->filename); nxsem_post(&g_pcode_handoff.exclsem); ret = -ENOMEM; goto errout_with_fd; } g_pcode_handoff.binp = binp; /* Successfully identified (but not really loaded) a p-code binary */ ret = OK; errout_with_fd: close(fd); return ret; } /**************************************************************************** * Name: pcode_unload * * Description: * Called when the pcode binary is unloaded. This is necessary primarily * to handler error conditions where unload_module is called after * pcode_load without having executed the P-Code module. * ****************************************************************************/ static int pcode_unload(struct binary_s *binp) { /* Increment the semaphore count back to one if appropriate */ if (g_pcode_handoff.binp) { g_pcode_handoff.binp = NULL; nxsem_post(&g_pcode_handoff.exclsem); } return OK; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: pcode_initialize * * Description: * In order to use the P-code binary format, this function must be called * during system initialization to register the P-Code binary format. * * Returned Value: * This is a NuttX internal function so it follows the convention that * 0 (OK) is returned on success and a negated errno is returned on * failure. * ****************************************************************************/ int pcode_initialize(void) { int ret; /* Initialize globals */ nxsem_init(&g_pcode_handoff.exclsem, 0, 1); /* Mount the test file system */ ret = pcode_mount_testfs(); if (ret < 0) { berr("ERROR: Failed to mount test file system: %d\n", ret); return ret; } /* Register ourselves as a binfmt loader */ binfo("Registering P-Code Loader\n"); ret = register_binfmt(&g_pcode_binfmt); if (ret != 0) { berr("Failed to register binfmt: %d\n", ret); } return ret; } /**************************************************************************** * Name: pcode_uninitialize * * Description: * Unregister the pcode binary loader * * Returned Value: * None * ****************************************************************************/ void pcode_uninitialize(void) { int ret; /* Unregister the binary format */ ret = unregister_binfmt(&g_pcode_binfmt); if (ret < 0) { berr("ERROR: unregister_binfmt() failed: %d\n", ret); } #ifdef CONFIG_BINFMT_PCODE_TEST_FS ret = umount(CONFIG_BINFMT_PCODE_TEST_MOUNTPOINT); if (ret < 0) { int errval = get_errno(); DEBUGASSERT(errval > 0); berr("ERROR: umount(%s) failed: %d\n", CONFIG_BINFMT_PCODE_TEST_MOUNTPOINT, errval); UNUSED(errval); } #endif /* Uninitialize globals */ nxsem_destroy(&g_pcode_handoff.exclsem); } #endif /* CONFIG_BINFMT_PCODE */