stack.h

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C头文件 代码 · 共 59 行

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*                            Open Watcom Project
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/*
 * scary low-level hack coming up....
 * this is used in functions which need a stack.
 * this makes a lot of assumptions about code generation, and assumes that
 * the user _really_ knows whats going on.
 * be _very_, _very_ careful when using these functions, and make _sure_ that
 * you do not blow the stack when using them!!!!
*/

extern unsigned_32 _stkpop( void );
extern void _stkpush( unsigned_32 );

#if defined(__386__)
#pragma aux     _stkpop = 0x58 /* pop eax */\
                        parm value [eax] modify nomemory [esp];
#pragma aux     _stkpush = 0x50 /* push eax */\
                        parm caller [eax] modify nomemory [esp];

#else                                           /* 16-bit land */
#pragma aux     _stkpop = 0x58 /* pop ax */\
                          0x5A /* pop dx */\
                        parm value [ax dx] modify nomemory [sp];
#pragma aux     _stkpush = 0x52 /* push dx */\
                          0x50  /* pop ax */\
                        parm caller [ax dx] modify nomemory [sp];
#endif