1.1 --- a/src/sh4/sh4trans.h	Tue Jan 01 05:08:38 2008 +0000
     1.2 +++ b/src/sh4/sh4trans.h	Mon Jan 14 09:08:58 2008 +0000
     1.3 @@ -16,6 +16,7 @@
     1.4   * GNU General Public License for more details.
     1.5   */
     1.6  
     1.7 +#include "sh4/xltcache.h"
     1.8  #include "dream.h"
     1.9  #include "mem.h"
    1.10  
    1.11 @@ -27,8 +28,13 @@
    1.12   * allows a little room
    1.13   */
    1.14  #define EPILOGUE_SIZE 128
    1.15 +
    1.16 +/** Maximum number of recovery records for a translated block (2048 based on
    1.17 + * 1 record per SH4 instruction in a 4K page).
    1.18 + */
    1.19 +#define MAX_RECOVERY_SIZE 2048
    1.20 +
    1.21  /**
    1.22 -
    1.23   */
    1.24  uint32_t sh4_xlat_run_slice( uint32_t nanosecs );
    1.25  
    1.26 @@ -38,7 +44,10 @@
    1.27   */
    1.28  void *sh4_translate_basic_block( sh4addr_t start );
    1.29  
    1.30 +
    1.31  extern uint8_t *xlat_output;
    1.32 +extern struct xlat_recovery_record xlat_recovery[MAX_RECOVERY_SIZE];
    1.33 +extern uint32_t xlat_recovery_posn;
    1.34  
    1.35  /******************************************************************************
    1.36   * Code generation - these methods must be provided by the
    1.37 @@ -51,3 +60,22 @@
    1.38  void sh4_translate_begin_block( sh4addr_t pc );
    1.39  uint32_t sh4_translate_instruction( sh4addr_t pc );
    1.40  void sh4_translate_end_block( sh4addr_t pc );
    1.41 +
    1.42 +typedef void (*unwind_thunk_t)(void);
    1.43 +
    1.44 +/**
    1.45 + * From within the translator, (typically called from MMU exception handling routines)
    1.46 + * immediately exit the current translation block (performing cleanup as necessary) and
    1.47 + * return to sh4_xlat_run_slice(). Effectively a fast longjmp w/ xlat recovery.
    1.48 + *
    1.49 + * Note: The correct working of this method depends on the translator anticipating the
    1.50 + * exception and generating the appropriate recovery block(s) - currently this means 
    1.51 + * that it should ONLY be called from within the context of a memory read or write.
    1.52 + *
    1.53 + * @param is_completion If TRUE, exit after completing the current instruction (effectively),
    1.54 + *   otherwise abort the current instruction with no effect. 
    1.55 + * @param thunk A function to execute after perform xlat recovery, but before returning
    1.56 + * to run_slice. If NULL, control returns directly.
    1.57 + * @return This method never returns. 
    1.58 + */
    1.59 +void sh4_translate_unwind_stack( gboolean is_completion, unwind_thunk_t thunk );