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Diffstat (limited to 'winsup/cygwin/autoload.h')
-rw-r--r-- | winsup/cygwin/autoload.h | 82 |
1 files changed, 0 insertions, 82 deletions
diff --git a/winsup/cygwin/autoload.h b/winsup/cygwin/autoload.h deleted file mode 100644 index 89f9eb0..0000000 --- a/winsup/cygwin/autoload.h +++ /dev/null @@ -1,82 +0,0 @@ -/* autoload.h: Define functions for auto-loading symbols from a DLL. - - Copyright 1999, 2000 Cygnus Solutions. - - Written by Christopher Faylor <cgf@cygnus.com> - -This file is part of Cygwin. - -This software is a copyrighted work licensed under the terms of the -Cygwin license. Please consult the file "CYGWIN_LICENSE" for -details. */ - -#define LoadDLLinitfunc(dllname) \ -HANDLE NO_COPY dllname ## _handle = NULL; \ -static int dllname ## _init () __asm__ (#dllname "_init") __attribute__ ((unused)); \ -static int dllname ## _init () - -#define LoadDLLinitnow(dllname) \ - ({__asm__ ("movl $cygwin_dll_func_load, " #dllname "_init_holder"); dllname##_init ();}) - -#define _LoadDLLinitnow(dllname) \ - __asm__ ("movl $cygwin_dll_func_load, " #dllname "_init_holder"); \ - __asm__ ("call " #dllname "_init"); \ - -#define LoadDLLinit(dllname) \ - __asm__ (".section .data_cygwin_nocopy,\"w\""); \ - __asm__ (#dllname "_init_holder: .long " #dllname "_init_and_load"); \ - __asm__ (".text"); \ - __asm__ (#dllname "_init_and_load:"); \ - _LoadDLLinitnow (dllname); \ - __asm__ ("jmp cygwin_dll_func_load"); - - -/* Macro for defining "auto-load" functions. - * Note that this is self-modifying code *gasp*. - * The first invocation of a routine will trigger the loading of - * the DLL. This will then be followed by the discovery of - * the procedure's entry point, which is placed into the location - * pointed to by the stack pointer. This code then changes - * the "call" operand which invoked it to a "jmp" which will - * transfer directly to the DLL function on the next invocation. - * - * Subsequent calls to routines whose transfer address has not been - * determined will skip the "load the dll" step, starting at the - * "discovery of the DLL" step. - * - * So, immediately following the the call to one of the above routines - * we have: - * foojmp (4 bytes) Pointer to a word containing the routine used - * to eventually invoke the function. Initially - * points to an init function which loads the - * DLL, gets the process's load address, - * changes the contents here to point to the - * function address, and changes the call *(%eax) - * to a jmp %eax. If the initialization has been - * done, only the load part is done. - * DLL handle (4 bytes) The handle to use when loading the DLL. - * flag (4 bytes) If "TRUE" then it is not a fatal error if this - * function cannot be found. Instead, error is set - * to ERROR_PROC_NOT_FOUND and 0 is returned. - * func name (n bytes) asciz string containing the name of the function - * to be loaded. - */ - -#define LoadDLLmangle(name, n) #name "@" #n -#define LoadDLLfunc(name, n, dllname) LoadDLLfuncEx (name, n, dllname, 0) -#define LoadDLLfuncEx(name, n, dllname, notimp) \ -__asm__ (".section .data_cygwin_nocopy,\"w\""); \ -__asm__ (".global _" LoadDLLmangle (name, n)); \ -__asm__ (".global _win32_" LoadDLLmangle (name, n)); \ -__asm__ (".align 8"); \ -__asm__ ("_" LoadDLLmangle (name, n) ":"); \ -__asm__ ("_win32_" LoadDLLmangle (name, n) ":"); \ -__asm__ ("movl (" #name "jump),%eax"); \ -__asm__ ("call *(%eax)"); \ -__asm__ (#name "jump: .long " #dllname "_init_holder"); \ -__asm__ (" .long _" #dllname "_handle"); \ -__asm__ (" .long " #n "+" #notimp); \ -__asm__ (".asciz \"" #name "\""); \ -__asm__ (".text"); \ - -extern "C" void cygwin_dll_func_load () __asm__ ("cygwin_dll_func_load"); |