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Diffstat (limited to 'unix/tclLoadAout.c')
| -rw-r--r-- | unix/tclLoadAout.c | 507 |
1 files changed, 0 insertions, 507 deletions
diff --git a/unix/tclLoadAout.c b/unix/tclLoadAout.c deleted file mode 100644 index 8b6da69..0000000 --- a/unix/tclLoadAout.c +++ /dev/null @@ -1,507 +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 1.3 1999/04/16 00:48:04 stanton Exp $ - */ - -#include "tclInt.h" -#include <fcntl.h> -#ifdef HAVE_EXEC_AOUT_H -# include <sys/exec_aout.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_ ((char * symbol)); - -/* - * Prototypes for procedures referenced only in this file: - */ - -static int FindLibraries _ANSI_ARGS_((Tcl_Interp * interp, char * fileName, - Tcl_DString * buf)); -static void UnlinkSymbolTable _ANSI_ARGS_((void)); - -/* - *---------------------------------------------------------------------- - * - * TclpLoadFile -- - * - * Dynamically loads a binary code file into memory and returns - * the addresses of two procedures within that file, if they - * are defined. - * - * Results: - * A standard Tcl completion code. If an error occurs, an error - * message is left in the interp's result. *proc1Ptr and *proc2Ptr - * are filled in with the addresses of the symbols given by - * *sym1 and *sym2, or NULL if those symbols can't be found. - * - * 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 -TclpLoadFile(interp, fileName, sym1, sym2, proc1Ptr, proc2Ptr, clientDataPtr) - Tcl_Interp *interp; /* Used for error reporting. */ - char *fileName; /* Name of the file containing the desired - * code (UTF-8). */ - char *sym1, *sym2; /* Names of two procedures to look up in - * the file's symbol table. */ - Tcl_PackageInitProc **proc1Ptr, **proc2Ptr; - /* Where to return the addresses corresponding - * to sym1 and sym2. */ - ClientData *clientDataPtr; /* Filled with token for dynamically loaded - * file which will be passed back to - * TclpUnloadFile() to unload the 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 */ - DictFn dictionary; /* Dictionary function in the load module */ - int status; /* Status return from Tcl_ calls */ - char * p; - - *clientDataPtr = NULL; - - /* 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(fileName, &linkCommandBuf); - Tcl_DStringAppend (&linkCommandBuf, " -A ", -1); - Tcl_DStringAppend (&linkCommandBuf, inputSymbolTable, -1); - Tcl_DStringAppend (&linkCommandBuf, " -N -T XXXXXXXX ", -1); - Tcl_DStringAppend (&linkCommandBuf, fileName, -1); - Tcl_DStringAppend (&linkCommandBuf, " ", -1); - if (FindLibraries (interp, fileName, &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 */ - -#if defined(__mips) || defined(mips) - status = lseek (relocatedFd, - N_TXTOFF (relocatedHead.ex_f, relocatedHead.ex_o), - SEEK_SET); -#else - status = lseek (relocatedFd, 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); - - /* Look up the entry points in the load module's dictionary. */ - - dictionary = (DictFn) startAddress; - *proc1Ptr = dictionary (sym1); - *proc2Ptr = dictionary (sym2); - - return TCL_OK; -} - -/* - *------------------------------------------------------------------------ - * - * 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, fileName, buf) - Tcl_Interp * interp; /* Used for error reporting */ - char * fileName; /* Name of the load module */ - Tcl_DString * buf; /* Buffer where the -l an -L flags */ -{ - FILE * f; /* The load module */ - int c; /* Byte from the load module */ - char * p; - Tcl_DString ds; - CONST char *native; - - /* Open the load module */ - - native = Tcl_UtfToExternalDString(NULL, fileName, -1, &ds); - f = fopen(native, "rb"); /* INTL: Native. */ - Tcl_DStringFree(&ds); - - 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(clientData) - ClientData clientData; /* ClientData returned by a previous call - * to TclpLoadFile(). The clientData 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) - 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. */ -{ - char *p, *q, *r; - int srcOff, dstOff; - - 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; -} |