src/arch/i386/include/setjmp.h

   1 #ifndef ETHERBOOT_SETJMP_H
   2 #define ETHERBOOT_SETJMP_H
   3
   4 FILE_LICENCE ( GPL2_OR_LATER );
   5
   6 #include <stdint.h>
   7 #include <realmode.h>
   8
   9 /** A jump buffer */
  10 typedef struct {
  11         uint32_t retaddr;
  12         uint32_t ebx;
  13         uint32_t esp;
  14         uint32_t ebp;
  15         uint32_t esi;
  16         uint32_t edi;
  17 } jmp_buf[1];
  18
  19 /** A real-mode-extended jump buffer */
  20 typedef struct {
  21         jmp_buf env;
  22         uint16_t rm_ss;
  23         uint16_t rm_sp;
  24 } rmjmp_buf[1];
  25
  26 extern int __asmcall setjmp ( jmp_buf env );
  27 extern void __asmcall longjmp ( jmp_buf env, int val );
  28
  29 #define rmsetjmp( _env ) ( {                    \
  30         (_env)->rm_ss = rm_ss;                  \
  31         (_env)->rm_sp = rm_sp;                  \
  32         setjmp ( (_env)->env ); } )             \
  33
  34 #define rmlongjmp( _env, _val ) do {            \
  35         rm_ss = (_env)->rm_ss;                  \
  36         rm_sp = (_env)->rm_sp;                  \
  37         longjmp ( (_env)->env, (_val) );        \
  38         } while ( 0 )
  39
  40 #endif /* ETHERBOOT_SETJMP_H */