Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
- $Id: emit.c 8211 2007-07-18 19:52:23Z michi $
+ $Id: emit.c 8260 2007-08-06 12:19:01Z michi $
*/
#include "vm/types.h"
#include <assert.h>
+#include <stdint.h>
#include "md-abi.h"
}
-/* emit_patcher_traps **********************************************************
+/* emit_trap *******************************************************************
- Generates the code for the patcher traps.
+ Emit a trap instruction and return the original machine code.
*******************************************************************************/
-void emit_patcher_traps(jitdata *jd)
+uint32_t emit_trap(codegendata *cd)
{
- codegendata *cd;
- codeinfo *code;
- patchref_t *pr;
- u1 *savedmcodeptr;
- u1 *tmpmcodeptr;
-
- /* get required compiler data */
-
- cd = jd->cd;
- code = jd->code;
-
- /* generate patcher traps code */
+ uint32_t mcode;
- for (pr = list_first_unsynced(code->patchers); pr != NULL; pr = list_next_unsynced(code->patchers, pr)) {
+ /* Get machine code which is patched back in later. The
+ trap is 1 instruction word long. */
- /* Get machine code which is patched back in later. The
- trap is 1 instruction word long. */
+ mcode = *((u4 *) cd->mcodeptr);
- tmpmcodeptr = (u1 *) (cd->mcodebase + pr->mpc);
- pr->mcode = *((u4 *) tmpmcodeptr);
+ /* Destination register must not be REG_ZERO, because then no
+ SIGSEGV is thrown. */
+ M_ALD_INTERN(REG_RESULT, REG_ZERO, EXCEPTION_HARDWARE_PATCHER);
- /* Patch in the trap to call the signal handler (done at
- compile time). */
-
- savedmcodeptr = cd->mcodeptr; /* save current mcodeptr */
- cd->mcodeptr = tmpmcodeptr; /* set mcodeptr to patch position */
-
- M_ALD_INTERN(REG_RESULT, REG_ZERO, EXCEPTION_HARDWARE_PATCHER);
-
- cd->mcodeptr = savedmcodeptr; /* restore the current mcodeptr */
- }
+ return mcode;
}