2 * 16-bit and 32-bit mode stack frame layout
4 * Copyright 1995, 1998 Alexandre Julliard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #ifndef __WINE_STACKFRAME_H
22 #define __WINE_STACKFRAME_H
28 #include "wine/winbase16.h"
32 /* 32-bit stack layout after CallTo16() */
33 typedef struct _STACK32FRAME
35 DWORD restore_addr; /* 00 return address for restoring code selector */
36 DWORD codeselector; /* 04 code selector to restore */
37 EXCEPTION_FRAME frame; /* 08 Exception frame */
38 SEGPTR frame16; /* 10 16-bit frame from last CallFrom16() */
39 DWORD edi; /* 14 saved registers */
44 DWORD ebp; /* 28 saved 32-bit frame pointer */
45 DWORD retaddr; /* 2c return address */
46 DWORD target; /* 30 target address / CONTEXT86 pointer */
47 DWORD nb_args; /* 34 number of 16-bit argument bytes */
50 /* 16-bit stack layout after CallFrom16() */
51 typedef struct _STACK16FRAME
53 STACK32FRAME *frame32; /* 00 32-bit frame from last CallTo16() */
54 DWORD edx; /* 04 saved registers */
61 DWORD callfrom_ip; /* 18 callfrom tail IP */
62 DWORD module_cs; /* 1c module code segment */
63 DWORD relay; /* 20 relay function address */
64 WORD entry_ip; /* 22 entry point IP */
65 DWORD entry_point; /* 26 API entry point to call, reused as mutex count */
66 WORD bp; /* 2a 16-bit stack frame chain */
67 WORD ip; /* 2c return address */
73 #define THREAD_STACK16(teb) ((STACK16FRAME*)MapSL((teb)->cur_stack))
74 #define CURRENT_STACK16 (THREAD_STACK16(NtCurrentTeb()))
75 #define CURRENT_DS (CURRENT_STACK16->ds)
77 /* varargs lists on the 16-bit stack */
79 typedef void *VA_LIST16;
81 #define __VA_ROUNDED16(type) \
82 ((sizeof(type) + sizeof(WORD) - 1) / sizeof(WORD) * sizeof(WORD))
83 #define VA_START16(list) ((list) = (VA_LIST16)(CURRENT_STACK16 + 1))
84 #define VA_ARG16(list,type) \
85 (((list) = (VA_LIST16)((char *)(list) + __VA_ROUNDED16(type))), \
86 *((type *)(void *)((char *)(list) - __VA_ROUNDED16(type))))
87 #define VA_END16(list) ((void)0)
90 /* Push bytes on the 16-bit stack of a thread;
91 * return a segptr to the first pushed byte
93 static inline SEGPTR WINE_UNUSED stack16_push( int size )
95 TEB *teb = NtCurrentTeb();
96 STACK16FRAME *frame = THREAD_STACK16(teb);
97 memmove( (char*)frame - size, frame, sizeof(*frame) );
98 teb->cur_stack -= size;
99 return (SEGPTR)(teb->cur_stack + sizeof(*frame));
102 /* Pop bytes from the 16-bit stack of a thread */
103 static inline void WINE_UNUSED stack16_pop( int size )
105 TEB *teb = NtCurrentTeb();
106 STACK16FRAME *frame = THREAD_STACK16(teb);
107 memmove( (char*)frame + size, frame, sizeof(*frame) );
108 teb->cur_stack += size;
111 /* Push a DWORD on the 32-bit stack */
112 static inline void WINE_UNUSED stack32_push( CONTEXT86 *context, DWORD val )
114 context->Esp -= sizeof(DWORD);
115 *(DWORD *)context->Esp = val;
118 /* Pop a DWORD from the 32-bit stack */
119 static inline DWORD WINE_UNUSED stack32_pop( CONTEXT86 *context )
121 DWORD ret = *(DWORD *)context->Esp;
122 context->Esp += sizeof(DWORD);
126 #endif /* __WINE_STACKFRAME_H */