#include "vm/jit/codegen-common.h"
#include "vm/jit/emit-common.h"
#include "vm/jit/jit.h"
+#include "vm/jit/patcher-common.h"
#include "vm/jit/replace.h"
#include "vmcore/options.h"
}
-/* emit_patcher_stubs **********************************************************
-
- Generates the code for the patcher stubs.
-
-*******************************************************************************/
-
-void emit_patcher_stubs(jitdata *jd)
-{
- codegendata *cd;
- patchref *pref;
- u8 mcode;
- u1 *savedmcodeptr;
- u1 *tmpmcodeptr;
- s4 targetdisp;
- s4 disp;
-
- /* get required compiler data */
-
- cd = jd->cd;
-
- /* generate code patching stub call code */
-
- targetdisp = 0;
-
- for (pref = cd->patchrefs; pref != NULL; pref = pref->next) {
- /* check size of code segment */
-
- MCODECHECK(512);
-
- /* Get machine code which is patched back in later. A
- `call rel32' is 5 bytes long (but read 8 bytes). */
-
- savedmcodeptr = cd->mcodebase + pref->branchpos;
- mcode = *((u8 *) savedmcodeptr);
-
- /* patch in `call rel32' to call the following code */
-
- tmpmcodeptr = cd->mcodeptr; /* save current mcodeptr */
- cd->mcodeptr = savedmcodeptr; /* set mcodeptr to patch position */
-
- M_CALL_IMM(tmpmcodeptr - (savedmcodeptr + PATCHER_CALL_SIZE));
-
- cd->mcodeptr = tmpmcodeptr; /* restore the current mcodeptr */
-
- /* move pointer to java_objectheader onto stack */
-
-#if defined(ENABLE_THREADS)
- /* create a virtual java_objectheader */
-
- (void) dseg_add_unique_address(cd, NULL); /* flcword */
- (void) dseg_add_unique_address(cd, lock_get_initial_lock_word());
- disp = dseg_add_unique_address(cd, NULL); /* vftbl */
-
- emit_lea_membase_reg(cd, RIP, -((cd->mcodeptr + 7) - cd->mcodebase) + disp, REG_ITMP3);
- M_PUSH(REG_ITMP3);
-#else
- M_PUSH_IMM(0);
-#endif
-
- /* move machine code bytes and classinfo pointer into registers */
-
- M_MOV_IMM(mcode, REG_ITMP3);
- M_PUSH(REG_ITMP3);
-
- M_MOV_IMM(pref->ref, REG_ITMP3);
- M_PUSH(REG_ITMP3);
-
- M_MOV_IMM(pref->disp, REG_ITMP3);
- M_PUSH(REG_ITMP3);
-
- M_MOV_IMM(pref->patcher, REG_ITMP3);
- M_PUSH(REG_ITMP3);
-
- if (targetdisp == 0) {
- targetdisp = cd->mcodeptr - cd->mcodebase;
-
- M_MOV_IMM(asm_patcher_wrapper, REG_ITMP3);
- M_JMP(REG_ITMP3);
- }
- else {
- M_JMP_IMM((cd->mcodebase + targetdisp) -
- (cd->mcodeptr + PATCHER_CALL_SIZE));
- }
- }
-}
-
-
/* emit_trap *******************************************************************
Emit a trap instruction and return the original machine code.
uint32_t emit_trap(codegendata *cd)
{
- uint32_t mcode;
+ uint16_t mcode;
- /* 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 2
+ bytes long. */
- mcode = *((uint32_t *) cd->mcodeptr);
+ mcode = *((uint16_t *) cd->mcodeptr);
- M_NOP;
+ /* XXX This needs to be change to INT3 when the debugging problems
+ with gdb are resolved. */
+
+ M_UD2;
return mcode;
}