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Diffstat (limited to 'unix/tclLoadAout.c')
| -rw-r--r-- | unix/tclLoadAout.c | 575 |
1 files changed, 0 insertions, 575 deletions
diff --git a/unix/tclLoadAout.c b/unix/tclLoadAout.c deleted file mode 100644 index 7557a94..0000000 --- a/unix/tclLoadAout.c +++ /dev/null @@ -1,575 +0,0 @@ -/* - * tclLoadAout.c -- - * - * This procedure provides a version of the TclLoadFile that provides - * pseudo-static linking using version-7 compatible a.out files described - * in either sys/exec.h or sys/a.out.h. - * - * Copyright (c) 1995, by General Electric Company. All rights reserved. - * - * See the file "license.terms" for information on usage and redistribution of - * this file, and for a DISCLAIMER OF ALL WARRANTIES. - * - * This work was supported in part by the ARPA Manufacturing Automation and - * Design Engineering (MADE) Initiative through ARPA contract - * F33615-94-C-4400. - * - * RCS: @(#) $Id: tclLoadAout.c,v 1.15 2005/07/19 13:37:18 dkf Exp $ - */ - -#include "tclInt.h" -#include <fcntl.h> -#ifdef HAVE_EXEC_AOUT_H -# include <sys/exec_aout.h> -#endif -#ifdef HAVE_UNISTD_H -# include <unistd.h> -#else -# include "../compat/unistd.h" -#endif - -/* - * Some systems describe the a.out header in sys/exec.h, and some in a.out.h. - */ - -#ifdef USE_SYS_EXEC_H -#include <sys/exec.h> -#endif -#ifdef USE_A_OUT_H -#include <a.out.h> -#endif -#ifdef USE_SYS_EXEC_AOUT_H -#include <sys/exec_aout.h> -#define a_magic a_midmag -#endif - -/* - * TCL_LOADSHIM is the amount by which to shim the break when loading - */ - -#ifndef TCL_LOADSHIM -#define TCL_LOADSHIM 0x4000L -#endif - -/* - * TCL_LOADALIGN must be a power of 2, and is the alignment to which to force - * the origin of load modules - */ - -#ifndef TCL_LOADALIGN -#define TCL_LOADALIGN 0x4000L -#endif - -/* - * TCL_LOADMAX is the maximum size of a load module, and is used as a sanity - * check when loading - */ - -#ifndef TCL_LOADMAX -#define TCL_LOADMAX 2000000L -#endif - -/* - * Kernel calls that appear to be missing from the system .h files: - */ - -extern char * brk _ANSI_ARGS_((char *)); -extern char * sbrk _ANSI_ARGS_((size_t)); - -/* - * The static variable SymbolTableFile contains the file name where the result - * of the last link was stored. The file is kept because doing so allows one - * load module to use the symbols defined in another. - */ - -static char *SymbolTableFile = NULL; - -/* - * Type of the dictionary function that begins each load module. - */ - -typedef Tcl_PackageInitProc * (* DictFn) _ANSI_ARGS_((CONST char * symbol)); - -/* - * Prototypes for procedures referenced only in this file: - */ - -static int FindLibraries _ANSI_ARGS_((Tcl_Interp *interp, - Tcl_Obj *pathPtr, Tcl_DString *buf)); -static void UnlinkSymbolTable _ANSI_ARGS_((void)); - -/* - *---------------------------------------------------------------------- - * - * TclpDlopen -- - * - * Dynamically loads a binary code file into memory and returns a handle - * to the new code. - * - * Results: - * A standard Tcl completion code. If an error occurs, an error message - * is left in the interp's result. - * - * Side effects: - * New code suddenly appears in memory. - * - * Bugs: - * This function does not attempt to handle the case where the BSS - * segment is not executable. It will therefore fail on Encore Multimax, - * Pyramid 90x, and similar machines. The reason is that the mprotect() - * kernel call, which would otherwise be employed to mark the - * newly-loaded text segment executable, results in a system crash on - * BSD/386. - * - * In an effort to make it fast, this function eschews the technique of - * linking the load module once, reading its header to determine its - * size, allocating memory for it, and linking it again. Instead, it - * `shims out' memory allocation by placing the module TCL_LOADSHIM bytes - * beyond the break, and assuming that any malloc() calls required to run - * the linker will not advance the break beyond that point. If the break - * is advanced beyonnd that point, the load will fail with an - * `inconsistent memory allocation' error. It perhaps ought to retry the - * link, but the failure has not been observed in two years of daily use - * of this function. - * - *---------------------------------------------------------------------- - */ - -int -TclpDlopen(interp, pathPtr, loadHandle, unloadProcPtr) - Tcl_Interp *interp; /* Used for error reporting. */ - Tcl_Obj *pathPtr; /* Name of the file containing the desired - * code (UTF-8). */ - Tcl_LoadHandle *loadHandle; /* Filled with token for dynamically loaded - * file which will be passed back to - * (*unloadProcPtr)() to unload the file. */ - Tcl_FSUnloadFileProc **unloadProcPtr; - /* Filled with address of Tcl_FSUnloadFileProc - * function which should be used for this - * file. */ -{ - char * inputSymbolTable; /* Name of the file containing the symbol - * table from the last link. */ - Tcl_DString linkCommandBuf; /* Command to do the run-time relocation of - * the module.*/ - char * linkCommand; - char relocatedFileName [L_tmpnam]; - /* Name of the file holding the relocated */ - /* text of the module */ - int relocatedFd; /* File descriptor of the file holding - * relocated text */ - struct exec relocatedHead; /* Header of the relocated text */ - unsigned long relocatedSize;/* Size of the relocated text */ - char * startAddress; /* Starting address of the module */ - int status; /* Status return from Tcl_ calls */ - char * p; - - /* - * Find the file that contains the symbols for the run-time link. - */ - - if (SymbolTableFile != NULL) { - inputSymbolTable = SymbolTableFile; - } else if (tclExecutableName == NULL) { - Tcl_SetResult(interp, "can't find the tclsh executable", TCL_STATIC); - return TCL_ERROR; - } else { - inputSymbolTable = tclExecutableName; - } - - /* - * Construct the `ld' command that builds the relocated module. - */ - - tmpnam(relocatedFileName); - Tcl_DStringInit(&linkCommandBuf); - Tcl_DStringAppend(&linkCommandBuf, "exec ld -o ", -1); - Tcl_DStringAppend(&linkCommandBuf, relocatedFileName, -1); -#if defined(__mips) || defined(mips) - Tcl_DStringAppend(&linkCommandBuf, " -G 0 ", -1); -#endif - Tcl_DStringAppend(&linkCommandBuf, " -u TclLoadDictionary_", -1); - TclGuessPackageName(Tcl_GetString(pathPtr), &linkCommandBuf); - Tcl_DStringAppend(&linkCommandBuf, " -A ", -1); - Tcl_DStringAppend(&linkCommandBuf, inputSymbolTable, -1); - Tcl_DStringAppend(&linkCommandBuf, " -N -T XXXXXXXX ", -1); - Tcl_DStringAppend(&linkCommandBuf, Tcl_GetString(pathPtr), -1); - Tcl_DStringAppend(&linkCommandBuf, " ", -1); - - if (FindLibraries(interp, pathPtr, &linkCommandBuf) != TCL_OK) { - Tcl_DStringFree(&linkCommandBuf); - return TCL_ERROR; - } - - linkCommand = Tcl_DStringValue(&linkCommandBuf); - - /* - * Determine the starting address, and plug it into the command. - */ - - startAddress = (char *) (((unsigned long) sbrk(0) - + TCL_LOADSHIM + TCL_LOADALIGN - 1) & (- TCL_LOADALIGN)); - p = strstr(linkCommand, "-T") + 3; - sprintf(p, "%08lx", (long) startAddress); - p[8] = ' '; - - /* - * Run the linker. - */ - - status = Tcl_Eval(interp, linkCommand); - Tcl_DStringFree(&linkCommandBuf); - if (status != 0) { - return TCL_ERROR; - } - - /* - * Open the linker's result file and read the header. - */ - - relocatedFd = open(relocatedFileName, O_RDONLY); - if (relocatedFd < 0) { - goto ioError; - } - status = read(relocatedFd, (char *) &relocatedHead, sizeof(relocatedHead)); - if (status < sizeof relocatedHead) { - goto ioError; - } - - /* - * Check the magic number. - */ - - if (relocatedHead.a_magic != OMAGIC) { - Tcl_AppendResult(interp, "bad magic number in intermediate file \"", - relocatedFileName, "\"", (char *) NULL); - goto failure; - } - - /* - * Make sure that memory allocation is still consistent. - */ - - if ((unsigned long) sbrk(0) > (unsigned long) startAddress) { - Tcl_SetResult(interp, "can't load, memory allocation is inconsistent.", - TCL_STATIC); - goto failure; - } - - /* - * Make sure that the relocated module's size is reasonable. - */ - - relocatedSize = relocatedHead.a_text + relocatedHead.a_data - + relocatedHead.a_bss; - if (relocatedSize > TCL_LOADMAX) { - Tcl_SetResult(interp, "module too big to load", TCL_STATIC); - goto failure; - } - - /* - * Advance the break to protect the loaded module. - */ - - (void) brk(startAddress + relocatedSize); - - /* - * Seek to the start of the module's text. - * - * Note that this does not really work with large files (i.e. where - * lseek64 exists and is different to lseek), but anyone trying to - * dynamically load a binary that is larger than what can fit in - * addressable memory is in trouble anyway... - */ - -#if defined(__mips) || defined(mips) - status = lseek(relocatedFd, - (off_t) N_TXTOFF(relocatedHead.ex_f, relocatedHead.ex_o), - SEEK_SET); -#else - status = lseek(relocatedFd, (off_t) N_TXTOFF (relocatedHead), SEEK_SET); -#endif - if (status < 0) { - goto ioError; - } - - /* - * Read in the module's text and data. - */ - - relocatedSize = relocatedHead.a_text + relocatedHead.a_data; - if (read(relocatedFd, startAddress, relocatedSize) < relocatedSize) { - brk(startAddress); - ioError: - Tcl_AppendResult(interp, "error on intermediate file \"", - relocatedFileName, "\": ", Tcl_PosixError(interp), - (char *) NULL); - failure: - (void) unlink(relocatedFileName); - return TCL_ERROR; - } - - /* - * Close the intermediate file. - */ - - (void) close(relocatedFd); - - /* - * Arrange things so that intermediate symbol tables eventually get - * deleted. - */ - - if (SymbolTableFile != NULL) { - UnlinkSymbolTable(); - } else { - atexit(UnlinkSymbolTable); - } - SymbolTableFile = ckalloc(strlen(relocatedFileName) + 1); - strcpy(SymbolTableFile, relocatedFileName); - - *loadHandle = startAddress; - return TCL_OK; -} - -/* - *---------------------------------------------------------------------- - * - * TclpFindSymbol -- - * - * Looks up a symbol, by name, through a handle associated with a - * previously loaded piece of code (shared library). - * - * Results: - * Returns a pointer to the function associated with 'symbol' if it is - * found. Otherwise returns NULL and may leave an error message in the - * interp's result. - * - *---------------------------------------------------------------------- - */ -Tcl_PackageInitProc* -TclpFindSymbol(interp, loadHandle, symbol) - Tcl_Interp *interp; - Tcl_LoadHandle loadHandle; - CONST char *symbol; -{ - /* - * Look up the entry point in the load module's dictionary. - */ - - DictFn dictionary = (DictFn) loadHandle; - - return (Tcl_PackageInitProc *) dictionary(sym1); -} - - -/* - *------------------------------------------------------------------------ - * - * FindLibraries -- - * - * Find the libraries needed to link a load module at run time. - * - * Results: - * A standard Tcl completion code. If an error occurs, an error message - * is left in the interp's result. The -l and -L flags are concatenated - * onto the dynamic string `buf'. - * - *------------------------------------------------------------------------ - */ - -static int -FindLibraries (interp, pathPtr, buf) - Tcl_Interp * interp; /* Used for error reporting */ - Tcl_Obj * pathPtr; /* Name of the load module */ - Tcl_DString * buf; /* Buffer where the -l an -L flags */ -{ - FILE * f; /* The load module */ - int c = 0; /* Byte from the load module */ - char * p; - CONST char *native; - - char *fileName = Tcl_GetString(pathPtr); - - /* - * Open the load module. - */ - - native = Tcl_FSGetNativePath(pathPtr); - f = fopen(native, "rb"); /* INTL: Native. */ - - if (f == NULL) { - Tcl_AppendResult(interp, "couldn't open \"", fileName, "\": ", - Tcl_PosixError(interp), (char *) NULL); - return TCL_ERROR; - } - - /* - * Search for the library list in the load module. - */ - - p = "@LIBS: "; - while (*p != '\0' && (c = getc(f)) != EOF) { - if (c == *p) { - ++p; - } else { - p = "@LIBS: "; - if (c == *p) { - ++p; - } - } - } - - /* - * No library list -- this must be an ill-formed module. - */ - - if (c == EOF) { - Tcl_AppendResult(interp, "File \"", fileName, - "\" is not a Tcl load module.", (char *) NULL); - (void) fclose(f); - return TCL_ERROR; - } - - /* - * Accumulate the library list. - */ - - while ((c = getc(f)) != '\0' && c != EOF) { - char cc = c; - Tcl_DStringAppend(buf, &cc, 1); - } - (void) fclose(f); - - if (c == EOF) { - Tcl_AppendResult(interp, "Library directory in \"", fileName, - "\" ends prematurely.", (char *) NULL); - return TCL_ERROR; - } - - return TCL_OK; -} - -/* - *------------------------------------------------------------------------ - * - * UnlinkSymbolTable -- - * - * Remove the symbol table file from the last dynamic link. - * - * Results: - * None. - * - * Side effects: - * The symbol table file from the last dynamic link is removed. This - * function is called when (a) a new symbol table is present because - * another dynamic link is complete, or (b) the process is exiting. - * - *------------------------------------------------------------------------ - */ - -static void -UnlinkSymbolTable() -{ - (void) unlink(SymbolTableFile); - ckfree(SymbolTableFile); - SymbolTableFile = NULL; -} - -/* - *---------------------------------------------------------------------- - * - * TclpUnloadFile -- - * - * Unloads a dynamically loaded binary code file from memory. Code - * pointers in the formerly loaded file are no longer valid after calling - * this function. - * - * Results: - * None. - * - * Side effects: - * Does nothing. Can anything be done? - * - *---------------------------------------------------------------------- - */ - -void -TclpUnloadFile(loadHandle) - Tcl_LoadHandle loadHandle; /* loadHandle returned by a previous call to - * TclpDlopen(). The loadHandle is a token - * that represents the loaded file. */ -{ -} - -/* - *---------------------------------------------------------------------- - * - * TclGuessPackageName -- - * - * If the "load" command is invoked without providing a package name, - * this procedure is invoked to try to figure it out. - * - * Results: - * Always returns 0 to indicate that we couldn't figure out a package - * name; generic code will then try to guess the package from the file - * name. A return value of 1 would have meant that we figured out the - * package name and put it in bufPtr. - * - * Side effects: - * None. - * - *---------------------------------------------------------------------- - */ - -int -TclGuessPackageName(fileName, bufPtr) - CONST char *fileName; /* Name of file containing package (already - * translated to local form if needed). */ - Tcl_DString *bufPtr; /* Initialized empty dstring. Append package - * name to this if possible. */ -{ - CONST char *p, *q; - char *r; - - if ((q = strrchr(fileName,'/'))) { - q++; - } else { - q = fileName; - } - if (!strncmp(q,"lib",3)) { - q+=3; - } - p = q; - while ((*p) && (*p != '.') && ((*p<'0') || (*p>'9'))) { - p++; - } - if ((p>q+2) && !strncmp(p-2,"_G0.",4)) { - p-=2; - } - if (p<q) { - return 0; - } - - Tcl_DStringAppend(bufPtr,q, p-q); - - r = Tcl_DStringValue(bufPtr); - r += strlen(r) - (p-q); - - /* - * Capitalize the string and then recompute the length. - */ - - Tcl_UtfToTitle(r); - Tcl_DStringSetLength(bufPtr, strlen(Tcl_DStringValue(bufPtr))); - - return 1; -} - -/* - * Local Variables: - * mode: c - * c-basic-offset: 4 - * fill-column: 78 - * End: - */ |