Initial bulk commit for "Git on MSys"
[msysgit/historical-msysgit.git] / mingw / include / excpt.h
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1 /*
2 * excpt.h
3 * This file has no copyright assigned and is placed in the Public Domain.
4 * This file is a part of the mingw-runtime package.
5 * No warranty is given; refer to the file DISCLAIMER within the package.
7 * Support for operating system level structured exception handling.
9 * NOTE: This is very preliminary stuff. I am also pretty sure it is
10 * completely Intel specific.
14 #ifndef _EXCPT_H_
15 #define _EXCPT_H_
17 /* All the headers include this file. */
18 #include <_mingw.h>
20 #include <windef.h>
23 * NOTE: The constants structs and typedefs below should be defined in the
24 * Win32 API headers.
26 #define EH_NONCONTINUABLE 0x01
27 #define EH_UNWINDING 0x02
28 #define EH_EXIT_UNWIND 0x04
29 #define EH_STACK_INVALID 0x08
30 #define EH_NESTED_CALL 0x10
32 #ifndef RC_INVOKED
34 typedef enum {
35 ExceptionContinueExecution,
36 ExceptionContinueSearch,
37 ExceptionNestedException,
38 ExceptionCollidedUnwind
39 } EXCEPTION_DISPOSITION;
43 * End of stuff that should be in the Win32 API files.
47 #ifdef __cplusplus
48 extern "C" {
49 #endif
52 * The type of function that is expected as an exception handler to be
53 * installed with __try1.
55 typedef EXCEPTION_DISPOSITION (*PEXCEPTION_HANDLER)
56 (struct _EXCEPTION_RECORD*, void*, struct _CONTEXT*, void*);
59 * This is not entirely necessary, but it is the structure installed by
60 * the __try1 primitive below.
62 typedef struct _EXCEPTION_REGISTRATION
64 struct _EXCEPTION_REGISTRATION* prev;
65 PEXCEPTION_HANDLER handler;
66 } EXCEPTION_REGISTRATION, *PEXCEPTION_REGISTRATION;
68 typedef EXCEPTION_REGISTRATION EXCEPTION_REGISTRATION_RECORD;
69 typedef PEXCEPTION_REGISTRATION PEXCEPTION_REGISTRATION_RECORD;
72 * A macro which installs the supplied exception handler.
73 * Push the pointer to the new handler onto the stack,
74 * then push the pointer to the old registration structure (at fs:0)
75 * onto the stack, then put a pointer to the new registration
76 * structure (i.e. the current stack pointer) at fs:0.
78 #define __try1(pHandler) \
79 __asm__ ("pushl %0;pushl %%fs:0;movl %%esp,%%fs:0;" : : "g" (pHandler));
82 * A macro which (despite its name) *removes* an installed
83 * exception handler. Should be used only in conjunction with the above
84 * install routine __try1.
85 * Move the pointer to the old reg. struct (at the current stack
86 * position) to fs:0, replacing the pointer we installed above,
87 * then add 8 to the stack pointer to get rid of the space we
88 * used when we pushed on our new reg. struct above. Notice that
89 * the stack must be in the exact state at this point that it was
90 * after we did __try1 or this will smash things.
92 #define __except1 \
93 __asm__ ("movl (%%esp),%%eax;movl %%eax,%%fs:0;addl $8,%%esp;" \
94 : : : "%eax");
96 #ifdef __cplusplus
98 #endif
100 #endif /* Not RC_INVOKED */
102 #endif /* _EXCPT_H_ not defined */