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Annotation of uae/src/od-dos/exectasks.h, revision 1.1.1.1

1.1       root        1:  /*
                      2:   * UAE - The Un*x Amiga Emulator
                      3:   *
                      4:   * Stack magic definitions for autoconf.c
                      5:   *
                      6:   * Copyright 1997 Bernd Schmidt
                      7:   */
                      8: 
                      9: #include <setjmp.h>
                     10: 
                     11: #undef CAN_DO_STACK_MAGIC
                     12: 
                     13: #if defined __GNUC__ && defined __GNUC_MINOR__
                     14: #if defined __i386__ && (__GNUC__ > 2 || __GNUC_MINOR__ >= 7)
                     15: #define CAN_DO_STACK_MAGIC
                     16: #endif
                     17: #endif
                     18: 
                     19: #ifdef CAN_DO_STACK_MAGIC
                     20: static inline void transfer_control(void *, int, void *, void *, int) __attribute__((noreturn));
                     21: static inline void transfer_control(void *s, int size, void *pc, void *f, int has_retval)
                     22: {
                     23:     unsigned long *stacktop = (unsigned long *)((char *)s + size - 20);
                     24:     stacktop[0] = 0xC0DEDBAD; /* return address */
                     25:     stacktop[1] = (int)s; /* function arg 1: stack */
                     26:     stacktop[2] = (int)f; /* function arg 2: trap function */
                     27:     stacktop[3] = (int)stacktop; /* function arg 3: return value address */
                     28:     stacktop[4] = has_retval;
                     29:     __asm__ __volatile__ ("movl %0,%%esp\n\tpushl %1\n\tret\n" : : "r" (stacktop), "r" (pc) : "memory");
                     30:     /* Not reached. */
                     31:     abort();
                     32: }
                     33: 
                     34: static inline uae_u32 get_retval_from_stack (void *s, int size)
                     35: {
                     36:     return *(uae_u32 *)((char *)s + size - 20);
                     37: }
                     38: 
                     39: static inline int stack_has_retval (void *s, int size)
                     40: {
                     41:     return *(int *)((char *)s + size - 4);
                     42: }
                     43: 
                     44: #define USE_EXECLIB
                     45: 
                     46: #else
                     47: 
                     48: #endif
                     49: 

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