* Removed all Id tags.
[cacao.git] / src / vm / jit / arm / emit.c
index d446136cb68a682997bf8aafbff365913f4fd75b..456d27cb9a86201a225db9972fbbe122965ee6a8 100644 (file)
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301, USA.
 
-   $Id: emit.c 4398 2006-01-31 23:43:08Z twisti $
-
 */
 
 
 #include "config.h"
 
 #include <assert.h>
+#include <stdint.h>
 
 #include "vm/types.h"
 
 
 #include "mm/memory.h"
 
-#if defined(ENABLE_THREADS)
-# include "threads/native/lock.h"
-#endif
+#include "threads/lock-common.h"
 
 #include "vm/builtin.h"
+#include "vm/exceptions.h"
 #include "vm/global.h"
 
+#include "vm/jit/abi.h"
 #include "vm/jit/asmpart.h"
 #include "vm/jit/emit-common.h"
 #include "vm/jit/jit.h"
+#include "vm/jit/patcher-common.h"
 #include "vm/jit/replace.h"
 
 #include "toolbox/logging.h" /* XXX for debugging only */
@@ -73,27 +73,41 @@ s4 emit_load(jitdata *jd, instruction *iptr, varinfo *src, s4 tempreg)
        if (src->flags & INMEMORY) {
                COUNT_SPILLS;
 
-               disp = src->vv.regoff * 4;
+               disp = src->vv.regoff;
 
-               if (IS_FLT_DBL_TYPE(src->type)) {
 #if defined(ENABLE_SOFTFLOAT)
-                       if (IS_2_WORD_TYPE(src->type))
-                               M_LLD(tempreg, REG_SP, disp);
-                       else
-                               M_ILD(tempreg, REG_SP, disp);
-#else
-                       if (IS_2_WORD_TYPE(src->type))
-                               M_DLD(tempreg, REG_SP, disp);
-                       else
-                               M_FLD(tempreg, REG_SP, disp);
-#endif
+               switch (src->type) {
+               case TYPE_INT:
+               case TYPE_FLT:
+               case TYPE_ADR:
+                       M_ILD(tempreg, REG_SP, disp);
+                       break;
+               case TYPE_LNG:
+               case TYPE_DBL:
+                       M_LLD(tempreg, REG_SP, disp);
+                       break;
+               default:
+                       vm_abort("emit_load: unknown type %d", src->type);
                }
-               else {
-                       if (IS_2_WORD_TYPE(src->type))
-                               M_LLD(tempreg, REG_SP, disp);
-                       else
-                               M_ILD(tempreg, REG_SP, disp);
+#else
+               switch (src->type) {
+               case TYPE_INT:
+               case TYPE_ADR:
+                       M_ILD(tempreg, REG_SP, disp);
+                       break;
+               case TYPE_LNG:
+                       M_LLD(tempreg, REG_SP, disp);
+                       break;
+               case TYPE_FLT:
+                       M_FLD(tempreg, REG_SP, disp);
+                       break;
+               case TYPE_DBL:
+                       M_DLD(tempreg, REG_SP, disp);
+                       break;
+               default:
+                       vm_abort("emit_load: unknown type %d", src->type);
                }
+#endif
 
                reg = tempreg;
        }
@@ -125,7 +139,7 @@ s4 emit_load_low(jitdata *jd, instruction *iptr, varinfo *src, s4 tempreg)
        if (src->flags & INMEMORY) {
                COUNT_SPILLS;
 
-               disp = src->vv.regoff * 4;
+               disp = src->vv.regoff;
 
 #if defined(__ARMEL__)
                M_ILD(tempreg, REG_SP, disp);
@@ -163,7 +177,7 @@ s4 emit_load_high(jitdata *jd, instruction *iptr, varinfo *src, s4 tempreg)
        if (src->flags & INMEMORY) {
                COUNT_SPILLS;
 
-               disp = src->vv.regoff * 4;
+               disp = src->vv.regoff;
 
 #if defined(__ARMEL__)
                M_ILD(tempreg, REG_SP, disp + 4);
@@ -198,35 +212,40 @@ void emit_store(jitdata *jd, instruction *iptr, varinfo *dst, s4 d)
        if (dst->flags & INMEMORY) {
                COUNT_SPILLS;
 
-               disp = dst->vv.regoff * 4;
+               disp = dst->vv.regoff;
 
-               if (IS_FLT_DBL_TYPE(dst->type)) {
 #if defined(ENABLE_SOFTFLOAT)
-                       if (IS_2_WORD_TYPE(dst->type))
-                               M_LST(d, REG_SP, disp);
-                       else
-                               M_IST(d, REG_SP, disp);
-#else
-                       if (IS_2_WORD_TYPE(dst->type))
-                               M_DST(d, REG_SP, disp);
-                       else
-                               M_FST(d, REG_SP, disp);
-#endif
-               }
-               else {
-                       if (IS_2_WORD_TYPE(dst->type))
-                               M_LST(d, REG_SP, disp);
-                       else
-                               M_IST(d, REG_SP, disp);
+               switch (dst->type) {
+               case TYPE_INT:
+               case TYPE_FLT:
+               case TYPE_ADR:
+                       M_IST(d, REG_SP, disp);
+                       break;
+               case TYPE_LNG:
+               case TYPE_DBL:
+                       M_LST(d, REG_SP, disp);
+                       break;
+               default:
+                       vm_abort("emit_store: unknown type %d", dst->type);
                }
-       }
-       else if (IS_LNG_TYPE(dst->type)) {
-#if defined(__ARMEL__)
-               if (GET_HIGH_REG(dst->vv.regoff) == REG_SPLIT)
-                       M_IST_INTERN(GET_HIGH_REG(d), REG_SP, 0 * 4);
 #else
-               if (GET_LOW_REG(dst->vv.regoff) == REG_SPLIT)
-                       M_IST_INTERN(GET_LOW_REG(d), REG_SP, 0 * 4);
+               switch (dst->type) {
+               case TYPE_INT:
+               case TYPE_ADR:
+                       M_IST(d, REG_SP, disp);
+                       break;
+               case TYPE_LNG:
+                       M_LST(d, REG_SP, disp);
+                       break;
+               case TYPE_FLT:
+                       M_FST(d, REG_SP, disp);
+                       break;
+               case TYPE_DBL:
+                       M_DST(d, REG_SP, disp);
+                       break;
+               default:
+                       vm_abort("emit_store: unknown type %d", dst->type);
+               }
 #endif
        }
 }
@@ -234,20 +253,25 @@ void emit_store(jitdata *jd, instruction *iptr, varinfo *dst, s4 d)
 
 /* emit_copy *******************************************************************
 
-   XXX
+   Generates a register/memory to register/memory copy.
 
 *******************************************************************************/
 
-void emit_copy(jitdata *jd, instruction *iptr, varinfo *src, varinfo *dst)
+void emit_copy(jitdata *jd, instruction *iptr)
 {
-       codegendata  *cd;
-       registerdata *rd;
-       s4            s1, d;
+       codegendata *cd;
+       varinfo     *src;
+       varinfo     *dst;
+       s4           s1, d;
 
        /* get required compiler data */
 
        cd = jd->cd;
-       rd = jd->rd;
+
+       /* get source and destination variables */
+
+       src = VAROP(iptr->s1);
+       dst = VAROP(iptr->dst);
 
        /* XXX dummy call, removed me!!! */
        d = codegen_reg_of_var(iptr->opc, dst, REG_ITMP1);
@@ -255,6 +279,11 @@ void emit_copy(jitdata *jd, instruction *iptr, varinfo *src, varinfo *dst)
        if ((src->vv.regoff != dst->vv.regoff) ||
                ((src->flags ^ dst->flags) & INMEMORY)) {
 
+               if ((src->type == TYPE_RET) || (dst->type == TYPE_RET)) {
+                       /* emit nothing, as the value won't be used anyway */
+                       return;
+               }
+
                /* If one of the variables resides in memory, we can eliminate
                   the register move from/to the temporary register with the
                   order of getting the destination register and the load. */
@@ -291,27 +320,45 @@ void emit_copy(jitdata *jd, instruction *iptr, varinfo *src, varinfo *dst)
                }
 
                if (s1 != d) {
-                       if (IS_FLT_DBL_TYPE(src->type)) {
 #if defined(ENABLE_SOFTFLOAT)
-                               if (IS_2_WORD_TYPE(src->type))
-                                       M_LNGMOVE(s1, d);
-                               else
-                                       /* XXX grrrr, wrong direction! */
-                                       M_MOV(d, s1);
-#else
-                               if (IS_2_WORD_TYPE(src->type))
-                                       M_DMOV(s1, d);
-                               else
-                                       M_FMOV(s1, d);
-#endif
+                       switch (src->type) {
+                       case TYPE_INT:
+                       case TYPE_FLT:
+                       case TYPE_ADR:
+                               /* XXX grrrr, wrong direction! */
+                               M_MOV(d, s1);
+                               break;
+                       case TYPE_LNG:
+                       case TYPE_DBL:
+                               /* XXX grrrr, wrong direction! */
+                               M_MOV(GET_LOW_REG(d), GET_LOW_REG(s1));
+                               M_MOV(GET_HIGH_REG(d), GET_HIGH_REG(s1));
+                               break;
+                       default:
+                               vm_abort("emit_copy: unknown type %d", src->type);
                        }
-                       else {
-                               if (IS_2_WORD_TYPE(src->type))
-                                       M_LNGMOVE(s1, d);
-                               else
-                                       /* XXX grrrr, wrong direction! */
-                                       M_MOV(d, s1);
+#else
+                       switch (src->type) {
+                       case TYPE_INT:
+                       case TYPE_ADR:
+                               /* XXX grrrr, wrong direction! */
+                               M_MOV(d, s1);
+                               break;
+                       case TYPE_LNG:
+                               /* XXX grrrr, wrong direction! */
+                               M_MOV(GET_LOW_REG(d), GET_LOW_REG(s1));
+                               M_MOV(GET_HIGH_REG(d), GET_HIGH_REG(s1));
+                               break;
+                       case TYPE_FLT:
+                               M_FMOV(s1, d);
+                               break;
+                       case TYPE_DBL:
+                               M_DMOV(s1, d);
+                               break;
+                       default:
+                               vm_abort("emit_copy: unknown type %d", src->type);
                        }
+#endif
                }
 
                emit_store(jd, iptr, dst, d);
@@ -338,291 +385,200 @@ void emit_iconst(codegendata *cd, s4 d, s4 value)
 }
 
 
-/* emit_nullpointer_check ******************************************************
-
-   Emit a NullPointerException check.
-
-*******************************************************************************/
-
-void emit_nullpointer_check(codegendata *cd, instruction *iptr, s4 reg)
-{
-       if (INSTRUCTION_MUST_CHECK(iptr)) {
-               M_TST(reg, reg);
-               M_BEQ(0);
-               codegen_add_nullpointerexception_ref(cd);
-       }
-}
-
-
-/* emit_arrayindexoutofbounds_check ********************************************
+/* emit_branch *****************************************************************
 
-   Emit a ArrayIndexOutOfBoundsException check.
+   Emits the code for conditional and unconditional branchs.
 
 *******************************************************************************/
 
-void emit_arrayindexoutofbounds_check(codegendata *cd, instruction *iptr, s4 s1, s4 s2)
+void emit_branch(codegendata *cd, s4 disp, s4 condition, s4 reg, u4 opt)
 {
-       if (INSTRUCTION_MUST_CHECK(iptr)) {
-               M_ILD_INTERN(REG_ITMP3, s1, OFFSET(java_arrayheader, size));
-               M_CMP(s2, REG_ITMP3);
-               M_BHS(0);
-               codegen_add_arrayindexoutofboundsexception_ref(cd, s2);
-       }
-}
+       s4 checkdisp;
+       s4 branchdisp;
 
+       /* calculate the different displacements */
 
-/* emit_exception_stubs ********************************************************
+       checkdisp  = (disp - 8);
+       branchdisp = (disp - 8) >> 2;
 
-   Generates the code for the exception stubs.
+       /* check which branch to generate */
 
-*******************************************************************************/
+       if (condition == BRANCH_UNCONDITIONAL) {
+               /* check displacement for overflow */
 
-void emit_exception_stubs(jitdata *jd)
-{
-       codegendata  *cd;
-       registerdata *rd;
-       exceptionref *er;
-       s4            branchmpc;
-       s4            targetmpc;
-       s4            targetdisp;
-       s4            disp;
-
-       /* get required compiler data */
-
-       cd = jd->cd;
-       rd = jd->rd;
-
-       /* generate exception stubs */
-
-       targetdisp = 0;
-
-       for (er = cd->exceptionrefs; er != NULL; er = er->next) {
-               /* back-patch the branch to this exception code */
-
-               branchmpc = er->branchpos;
-               targetmpc = cd->mcodeptr - cd->mcodebase;
-
-               md_codegen_patch_branch(cd, branchmpc, targetmpc);
+               if ((checkdisp < (s4) 0xff000000) || (checkdisp > (s4) 0x00ffffff)) {
+                       /* if the long-branches flag isn't set yet, do it */
 
-               MCODECHECK(100);
-
-               /* Check if the exception is an
-                  ArrayIndexOutOfBoundsException.  If so, move index register
-                  into REG_ITMP1. */
-
-               if (er->reg != -1)
-                       M_MOV(REG_ITMP1, er->reg);
-
-               /* calcuate exception address */
-
-               assert((er->branchpos - 4) % 4 == 0);
-               M_ADD_IMM_EXT_MUL4(REG_ITMP2_XPC, REG_PV, (er->branchpos - 4) / 4);
-
-               /* move function to call into REG_ITMP3 */
-
-               disp = dseg_add_functionptr(cd, er->function);
-               M_DSEG_LOAD(REG_ITMP3, disp);
-
-               if (targetdisp == 0) {
-                       targetdisp = ((u4 *) cd->mcodeptr) - ((u4 *) cd->mcodebase);
-
-                       M_MOV(rd->argintregs[0], REG_PV);
-                       M_MOV(rd->argintregs[1], REG_SP);
-
-                       if (jd->isleafmethod)
-                               M_MOV(rd->argintregs[2], REG_LR);
-                       else
-                               M_LDR(rd->argintregs[2], REG_SP,
-                                         cd->stackframesize * 4 - SIZEOF_VOID_P);
-
-                       M_MOV(rd->argintregs[3], REG_ITMP2_XPC);
-
-                       /* save registers */
-                       /* TODO: we only need to save LR in leaf methods */
-
-                       M_STMFD(BITMASK_ARGS | 1<<REG_PV | 1<<REG_LR, REG_SP);
-
-                       /* move a3 to stack */
-
-                       M_STR_UPDATE(REG_ITMP1, REG_SP, -4);
-
-                       /* do the exception call */
-
-                       M_MOV(REG_LR, REG_PC);
-                       M_MOV(REG_PC, REG_ITMP3);
-
-                       M_ADD_IMM(REG_SP, REG_SP, 4);
-
-                       /* result of stacktrace is our XPTR */
+                       if (!CODEGENDATA_HAS_FLAG_LONGBRANCHES(cd)) {
+                               cd->flags |= (CODEGENDATA_FLAG_ERROR |
+                                                         CODEGENDATA_FLAG_LONGBRANCHES);
+                       }
 
-                       M_MOV(REG_ITMP1_XPTR, REG_RESULT);
+                       vm_abort("emit_branch: emit unconditional long-branch code");
+               }
+               else {
+                       M_B(branchdisp);
+               }
+       }
+       else {
+               /* and displacement for overflow */
 
-                       /* restore registers */
+               if ((checkdisp < (s4) 0xff000000) || (checkdisp > (s4) 0x00ffffff)) {
+                       /* if the long-branches flag isn't set yet, do it */
 
-                       M_LDMFD(BITMASK_ARGS | 1<<REG_PV | 1<<REG_LR, REG_SP);
+                       if (!CODEGENDATA_HAS_FLAG_LONGBRANCHES(cd)) {
+                               cd->flags |= (CODEGENDATA_FLAG_ERROR |
+                                                         CODEGENDATA_FLAG_LONGBRANCHES);
+                       }
 
-                       disp = dseg_add_functionptr(cd, asm_handle_exception);
-                       M_DSEG_LOAD(REG_ITMP3, disp);
-                       M_MOV(REG_PC, REG_ITMP3);
+                       vm_abort("emit_branch: emit conditional long-branch code");
                }
                else {
-                       disp = (((u4 *) cd->mcodebase) + targetdisp) -
-                               (((u4 *) cd->mcodeptr) + 2);
-
-                       M_B(disp);
+                       switch (condition) {
+                       case BRANCH_EQ:
+                               M_BEQ(branchdisp);
+                               break;
+                       case BRANCH_NE:
+                               M_BNE(branchdisp);
+                               break;
+                       case BRANCH_LT:
+                               M_BLT(branchdisp);
+                               break;
+                       case BRANCH_GE:
+                               M_BGE(branchdisp);
+                               break;
+                       case BRANCH_GT:
+                               M_BGT(branchdisp);
+                               break;
+                       case BRANCH_LE:
+                               M_BLE(branchdisp);
+                               break;
+                       case BRANCH_UGT:
+                               M_BHI(branchdisp);
+                               break;
+                       default:
+                               vm_abort("emit_branch: unknown condition %d", condition);
+                       }
                }
        }
 }
 
 
-/* emit_patcher_stubs **********************************************************
+/* emit_arithmetic_check *******************************************************
 
-   Generates the code for the patcher stubs.
+   Emit an ArithmeticException check.
 
 *******************************************************************************/
 
-void emit_patcher_stubs(jitdata *jd)
+void emit_arithmetic_check(codegendata *cd, instruction *iptr, s4 reg)
 {
-       codegendata *cd;
-       patchref    *pref;
-       u4           mcode;
-       u1          *savedmcodeptr;
-       u1          *tmpmcodeptr;
-       s4           targetdisp;
-       s4           disp;
-
-       /* get required compiler data */
-
-       cd = jd->cd;
-
-       /* generate patcher stub call code */
-
-       targetdisp = 0;
-
-       for (pref = cd->patchrefs; pref != NULL; pref = pref->next) {
-               /* check code segment size */
-
-               MCODECHECK(100);
-
-               /* Get machine code which is patched back in later. The
-                  call is 1 instruction word long. */
-
-               tmpmcodeptr = (u1 *) (cd->mcodebase + pref->branchpos);
-
-               mcode = *((u4 *) tmpmcodeptr);
-
-               /* Patch in the call to call the following code (done at
-                  compile time). */
-
-               savedmcodeptr = cd->mcodeptr;   /* save current mcodeptr              */
-               cd->mcodeptr  = tmpmcodeptr;    /* set mcodeptr to patch position     */
-
-               disp = ((u4 *) savedmcodeptr) - (((u4 *) tmpmcodeptr) + 2);
-               M_B(disp);
-
-               cd->mcodeptr = savedmcodeptr;   /* restore the current mcodeptr       */
+       if (INSTRUCTION_MUST_CHECK(iptr)) {
+               CHECK_INT_REG(reg);
+               M_TEQ_IMM(reg, 0);
+               M_TRAPEQ(0, EXCEPTION_HARDWARE_ARITHMETIC);
+       }
+}
 
-               /* create stack frame (align stack to 8-byte) */
 
-               M_SUB_IMM(REG_SP, REG_SP, 8 * 4);
+/* emit_nullpointer_check ******************************************************
 
-               /* save itmp3 onto stack */
+   Emit a NullPointerException check.
 
-               M_STR_INTERN(REG_ITMP3, REG_SP, 6 * 4);
+*******************************************************************************/
 
-               /* calculate return address and move it onto stack */
-               /* ATTENTION: we can not use BL to branch to patcher stub,        */
-               /* ATTENTION: because we need to preserve LR for leaf methods     */
+void emit_nullpointer_check(codegendata *cd, instruction *iptr, s4 reg)
+{
+       if (INSTRUCTION_MUST_CHECK(iptr)) {
+               M_TST(reg, reg);
+               M_TRAPEQ(0, EXCEPTION_HARDWARE_NULLPOINTER);
+       }
+}
 
-               disp = (s4) (((u4 *) cd->mcodeptr) - (((u4 *) tmpmcodeptr) + 1) + 2);
+void emit_nullpointer_check_force(codegendata *cd, instruction *iptr, s4 reg)
+{
+       M_TST(reg, reg);
+       M_TRAPEQ(0, EXCEPTION_HARDWARE_NULLPOINTER);
+}
 
-               M_SUB_IMM_EXT_MUL4(REG_ITMP3, REG_PC, disp);
-               M_STR_INTERN(REG_ITMP3, REG_SP, 4 * 4);
 
-               /* move pointer to java_objectheader onto stack */
+/* emit_arrayindexoutofbounds_check ********************************************
 
-#if defined(ENABLE_THREADS)
-               /* order reversed because of data segment layout */
+   Emit a ArrayIndexOutOfBoundsException check.
 
-               (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      */
+*******************************************************************************/
 
-               M_SUB_IMM_EXT_MUL4(REG_ITMP3, REG_PV, -disp / 4);
-               M_STR_INTERN(REG_ITMP3, REG_SP, 3 * 4);
-#else
-               M_EOR(REG_ITMP3, REG_ITMP3, REG_ITMP3);
-               M_STR_INTERN(REG_ITMP3, REG_SP, 3 * 4);
-#endif
+void emit_arrayindexoutofbounds_check(codegendata *cd, instruction *iptr, s4 s1, s4 s2)
+{
+       if (INSTRUCTION_MUST_CHECK(iptr)) {
+               M_ILD_INTERN(REG_ITMP3, s1, OFFSET(java_array_t, size));
+               M_CMP(s2, REG_ITMP3);
+               M_TRAPHS(s2, EXCEPTION_HARDWARE_ARRAYINDEXOUTOFBOUNDS);
+       }
+}
 
-               /* move machine code onto stack */
 
-               disp = dseg_add_unique_s4(cd, mcode);
-               M_DSEG_LOAD(REG_ITMP3, disp);
-               M_STR_INTERN(REG_ITMP3, REG_SP, 2 * 4);
+/* emit_classcast_check ********************************************************
 
-               /* move class/method/field reference onto stack */
+   Emit a ClassCastException check.
 
-               disp = dseg_add_unique_address(cd, pref->ref);
-               M_DSEG_LOAD(REG_ITMP3, disp);
-               M_STR_INTERN(REG_ITMP3, REG_SP, 1 * 4);
+*******************************************************************************/
 
-               /* move data segment displacement onto stack */
+void emit_classcast_check(codegendata *cd, instruction *iptr, s4 condition, s4 reg, s4 s1)
+{
+       if (INSTRUCTION_MUST_CHECK(iptr)) {
+               switch (condition) {
+               case BRANCH_EQ:
+                       M_TRAPEQ(s1, EXCEPTION_HARDWARE_CLASSCAST);
+                       break;
 
-               disp = dseg_add_unique_s4(cd, pref->disp);
-               M_DSEG_LOAD(REG_ITMP3, disp);
-               M_STR_INTERN(REG_ITMP3, REG_SP, 5 * 4);
+               case BRANCH_LE:
+                       M_TRAPLE(s1, EXCEPTION_HARDWARE_CLASSCAST);
+                       break;
 
-               /* move patcher function pointer onto stack */
+               case BRANCH_UGT:
+                       M_TRAPHI(s1, EXCEPTION_HARDWARE_CLASSCAST);
+                       break;
 
-               disp = dseg_add_functionptr(cd, pref->patcher);
-               M_DSEG_LOAD(REG_ITMP3, disp);
-               M_STR_INTERN(REG_ITMP3, REG_SP, 0 * 4);
+               default:
+                       vm_abort("emit_classcast_check: unknown condition %d", condition);
+               }
+       }
+}
 
-               /* finally call the patcher via asm_patcher_wrapper */
-               /* ATTENTION: don't use REG_PV here, because some patchers need it */
+/* emit_exception_check ********************************************************
 
-               if (targetdisp == 0) {
-                       targetdisp = ((u4 *) cd->mcodeptr) - ((u4 *) cd->mcodebase);
+   Emit an Exception check.
 
-                       disp = dseg_add_functionptr(cd, asm_patcher_wrapper);
-                       /*M_DSEG_BRANCH_NOLINK(REG_PC, REG_PV, a);*/
-                       /* TODO: this is only a hack */
-                       M_DSEG_LOAD(REG_ITMP3, disp);
-                       M_MOV(REG_PC, REG_ITMP3);
-               }
-               else {
-                       disp = (((u4 *) cd->mcodebase) + targetdisp) -
-                               (((u4 *) cd->mcodeptr) + 2);
+*******************************************************************************/
 
-                       M_B(disp);
-               }
+void emit_exception_check(codegendata *cd, instruction *iptr)
+{
+       if (INSTRUCTION_MUST_CHECK(iptr)) {
+               M_TST(REG_RESULT, REG_RESULT);
+               M_TRAPEQ(0, EXCEPTION_HARDWARE_EXCEPTION);
        }
 }
 
 
-/* emit_replacement_stubs ******************************************************
+/* emit_trap *******************************************************************
 
-   Generates the code for the replacement stubs.
+   Emit a trap instruction and return the original machine code.
 
 *******************************************************************************/
 
-#if defined(ENABLE_REPLACEMENT)
-void emit_replacement_stubs(jitdata *jd)
+uint32_t emit_trap(codegendata *cd)
 {
-       codegendata *cd;
-       codeinfo    *code;
-       rplpoint    *rplp;
-       u1          *savedmcodeptr;
-       s4           disp;
-       s4           i;
+       uint32_t mcode;
 
-       /* get required compiler data */
+       /* Get machine code which is patched back in later. The
+          trap is 1 instruction word long. */
+
+       mcode = *((u4 *) cd->mcodeptr);
+
+       M_TRAP(0, EXCEPTION_HARDWARE_PATCHER);
 
-       cd   = jd->cd;
-       code = jd->code;
+       return mcode;
 }
-#endif /* defined(ENABLE_REPLACEMENT) */
 
 
 /* emit_verbosecall_enter ******************************************************
@@ -658,11 +614,13 @@ void emit_verbosecall_enter(jitdata *jd)
 
        M_NOP;
 
-       /* save argument registers to stack (including LR and PV) */
+       /* Save argument registers to stack (including LR and PV).  Keep
+          stack 8-byte aligned. */
+
        M_STMFD(BITMASK_ARGS | (1<<REG_LR) | (1<<REG_PV), REG_SP);
-       M_SUB_IMM(REG_SP, REG_SP, (2 + 2 + 1) * 4);     /* space for a3, a4 and m */
+       M_SUB_IMM(REG_SP, REG_SP, (2 + 2 + 1 + 1) * 4); /* space for a3, a4 and m */
 
-       stackframesize += 6 + 2 + 2 + 1;
+       stackframesize += (6 + 2 + 2 + 1 + 1) * 4;
 
        /* prepare args for tracer */
 
@@ -683,27 +641,28 @@ void emit_verbosecall_enter(jitdata *jd)
                                M_MOV_IMM(REG_ITMP1, 0);
                                s1 = PACK_REGS(s1, REG_ITMP1);
                        }
-                       else {
-                               SPLIT_OPEN(t, s1, REG_ITMP1);
-                               SPLIT_LOAD(t, s1, stackframesize);
-                       }
                }
                else {
-                       s1 = md->params[i].regoff + stackframesize;
+                       s1 = REG_ITMP12_PACKED;
+                       s2 = md->params[i].regoff + stackframesize;
 
                        if (IS_2_WORD_TYPE(t))
-                               M_LLD(REG_ITMP12_PACKED, REG_SP, s1 * 4);
-                       else
-                               M_ILD(REG_ITMP1, REG_SP, s1 * 4);
+                               M_LLD(s1, REG_SP, s2);
+                       else {
+                               M_ILD(GET_LOW_REG(s1), REG_SP, s2);
+                               M_MOV_IMM(GET_HIGH_REG(s1), 0);
+                       }
                }
 
                /* place argument for tracer */
 
                if (i < 2) {
 #if defined(__ARMEL__)
-                       s2 = PACK_REGS(rd->argintregs[i * 2], rd->argintregs[i * 2 + 1]);
+                       s2 = PACK_REGS(abi_registers_integer_argument[i * 2],
+                                                  abi_registers_integer_argument[i * 2 + 1]);
 #else /* defined(__ARMEB__) */
-                       s2 = PACK_REGS(rd->argintregs[i * 2 + 1], rd->argintregs[i * 2]);
+                       s2 = PACK_REGS(abi_registers_integer_argument[i * 2 + 1],
+                                                  abi_registers_integer_argument[i * 2]);
 #endif          
                        M_LNGMOVE(s1, s2);
                }
@@ -721,11 +680,12 @@ void emit_verbosecall_enter(jitdata *jd)
 
        /* call tracer here (we use a long branch) */
 
-       M_LONGBRANCH(builtin_trace_args);
+       M_LONGBRANCH(builtin_verbosecall_enter);
 
-       /* restore argument registers from stack */
+       /* Restore argument registers from stack.  Keep stack 8-byte
+          aligned. */
 
-       M_ADD_IMM(REG_SP, REG_SP, (2 + 2 + 1) * 4);        /* free argument stack */
+       M_ADD_IMM(REG_SP, REG_SP, (2 + 2 + 1 + 1) * 4);    /* free argument stack */
        M_LDMFD(BITMASK_ARGS | (1<<REG_LR) | (1<<REG_PV), REG_SP);
 
        /* mark trace code */
@@ -739,6 +699,8 @@ void emit_verbosecall_enter(jitdata *jd)
 
    Generates the code for the call trace.
 
+   void builtin_verbosecall_exit(s8 l, double d, float f, methodinfo *m);
+
 *******************************************************************************/
 
 #if !defined(NDEBUG)
@@ -762,33 +724,37 @@ void emit_verbosecall_exit(jitdata *jd)
 
        M_NOP;
 
+       /* Keep stack 8-byte aligned. */
+
        M_STMFD(BITMASK_RESULT | (1<<REG_LR) | (1<<REG_PV), REG_SP);
-       M_SUB_IMM(REG_SP, REG_SP, (1 + 1) * 4);    /* space for d[high reg] and f */
+       M_SUB_IMM(REG_SP, REG_SP, (1 + 1) * 4);              /* space for f and m */
 
        switch (md->returntype.type) {
        case TYPE_ADR:
        case TYPE_INT:
-               M_INTMOVE(REG_RESULT, GET_LOW_REG(REG_A1_A2_PACKED));
-               M_MOV_IMM(GET_HIGH_REG(REG_A1_A2_PACKED), 0);
+               M_INTMOVE(REG_RESULT, GET_LOW_REG(REG_A0_A1_PACKED));
+               M_MOV_IMM(GET_HIGH_REG(REG_A0_A1_PACKED), 0);
                break;
 
        case TYPE_LNG:
-               M_LNGMOVE(REG_RESULT_PACKED, REG_A1_A2_PACKED);
+               M_LNGMOVE(REG_RESULT_PACKED, REG_A0_A1_PACKED);
                break;
 
        case TYPE_FLT:
-               M_IST(REG_RESULT, REG_SP, 1 * 4);
+               M_IST(REG_RESULT, REG_SP, 0 * 4);
                break;
 
        case TYPE_DBL:
-               M_INTMOVE(REG_RESULT, REG_A3);
-               M_IST(REG_RESULT2, REG_SP, 0 * 4);
+               M_LNGMOVE(REG_RESULT_PACKED, REG_A2_A3_PACKED);
                break;
        }
 
        disp = dseg_add_address(cd, m);
-       M_DSEG_LOAD(REG_A0, disp);
-       M_LONGBRANCH(builtin_displaymethodstop);
+       M_DSEG_LOAD(REG_ITMP1, disp);
+       M_AST(REG_ITMP1, REG_SP, 1 * 4);
+       M_LONGBRANCH(builtin_verbosecall_exit);
+
+       /* Keep stack 8-byte aligned. */
 
        M_ADD_IMM(REG_SP, REG_SP, (1 + 1) * 4);            /* free argument stack */
        M_LDMFD(BITMASK_RESULT | (1<<REG_LR) | (1<<REG_PV), REG_SP);