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-rw-r--r--unix/tclLoadAout.c534
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diff --git a/unix/tclLoadAout.c b/unix/tclLoadAout.c
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-/*
- * 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.
- */
-
-#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;
-}