emit.cpp

Go to the documentation of this file.

/* src/vm/jit/mips/emit.cpp - MIPS code emitter functions

   Copyright (C) 1996-2014
   CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO

   This file is part of CACAO.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.

*/


#include "config.h"

#include <cassert>

#include "vm/types.hpp"

#include "vm/jit/mips/codegen.hpp"
#include "vm/jit/mips/md-abi.hpp"

#include "mm/memory.hpp"

#include "threads/lock.hpp"

#include "vm/descriptor.hpp"            // for typedesc, methoddesc, etc
#include "vm/options.hpp"

#include "vm/jit/abi.hpp"
#include "vm/jit/abi-asm.hpp"
#include "vm/jit/asmpart.hpp"
#include "vm/jit/builtin.hpp"
#include "vm/jit/code.hpp"
#include "vm/jit/codegen-common.hpp"
#include "vm/jit/dseg.hpp"
#include "vm/jit/emit-common.hpp"
#include "vm/jit/jit.hpp"
#include "vm/jit/patcher-common.hpp"
#include "vm/jit/replace.hpp"
#include "vm/jit/trace.hpp"
#include "vm/jit/trap.hpp"

#include "vm/jit/ir/instruction.hpp"


/* emit_load *******************************************************************

   Emits a possible load of an operand.

*******************************************************************************/

s4 emit_load(jitdata *jd, instruction *iptr, varinfo *src, s4 tempreg)
{
    codegendata  *cd;
    s4            disp;
    s4            reg;

    /* get required compiler data */

    cd = jd->cd;

    if (src->flags & INMEMORY) {
        COUNT_SPILLS;

        disp = src->vv.regoff;

        switch (src->type) {
#if SIZEOF_VOID_P == 8
        case TYPE_INT:
        case TYPE_LNG:
        case TYPE_ADR:
            M_LLD(tempreg, REG_SP, disp);
            break;
#else
        case TYPE_INT:
        case TYPE_ADR:
            M_ILD(tempreg, REG_SP, disp);
            break;
        case TYPE_LNG:
            M_LLD(tempreg, REG_SP, disp);
            break;
#endif
        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);
            break;
        }

        reg = tempreg;
    }
    else
        reg = src->vv.regoff;

    return reg;
}


/* emit_load_low ***************************************************************

   Emits a possible load of the low 32-bits of an operand.

*******************************************************************************/

#if SIZEOF_VOID_P == 4
s4 emit_load_low(jitdata *jd, instruction *iptr, varinfo *src, s4 tempreg)
{
    codegendata  *cd;
    s4            disp;
    s4            reg;

    assert(src->type == TYPE_LNG);

    /* get required compiler data */

    cd = jd->cd;

    if (src->flags & INMEMORY) {
        COUNT_SPILLS;

        disp = src->vv.regoff;

#if WORDS_BIGENDIAN == 1
        M_ILD(tempreg, REG_SP, disp + 4);
#else
        M_ILD(tempreg, REG_SP, disp);
#endif

        reg = tempreg;
    }
    else
        reg = GET_LOW_REG(src->vv.regoff);

    return reg;
}
#endif /* SIZEOF_VOID_P == 4 */


/* emit_load_high **************************************************************

   Emits a possible load of the high 32-bits of an operand.

*******************************************************************************/

#if SIZEOF_VOID_P == 4
s4 emit_load_high(jitdata *jd, instruction *iptr, varinfo *src, s4 tempreg)
{
    codegendata  *cd;
    s4            disp;
    s4            reg;

    assert(src->type == TYPE_LNG);

    /* get required compiler data */

    cd = jd->cd;

    if (src->flags & INMEMORY) {
        COUNT_SPILLS;

        disp = src->vv.regoff;

#if WORDS_BIGENDIAN == 1
        M_ILD(tempreg, REG_SP, disp);
#else
        M_ILD(tempreg, REG_SP, disp + 4);
#endif

        reg = tempreg;
    }
    else
        reg = GET_HIGH_REG(src->vv.regoff);

    return reg;
}
#endif /* SIZEOF_VOID_P == 4 */


/* emit_store ******************************************************************

   Emits a possible store to variable.

*******************************************************************************/

void emit_store(jitdata *jd, instruction *iptr, varinfo *dst, s4 d)
{
    codegendata  *cd;
    s4            disp;

    /* get required compiler data */

    cd = jd->cd;

    if (dst->flags & INMEMORY) {
        COUNT_SPILLS;

        disp = dst->vv.regoff;

        switch (dst->type) {
#if SIZEOF_VOID_P == 8
        case TYPE_INT:
        case TYPE_LNG:
        case TYPE_ADR:
            M_LST(d, REG_SP, disp);
            break;
#else
        case TYPE_INT:
        case TYPE_ADR:
            M_IST(d, REG_SP, disp);
            break;
        case TYPE_LNG:
            M_LST(d, REG_SP, disp);
            break;
#endif
        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);
            break;
        }
    }
}


/* emit_copy *******************************************************************

   Generates a register/memory to register/memory copy.

*******************************************************************************/

void emit_copy(jitdata *jd, instruction *iptr)
{
    codegendata *cd;
    varinfo     *src;
    varinfo     *dst;
    s4           s1, d;

    /* get required compiler data */

    cd = jd->cd;

    /* get source and destination variables */

    src = VAROP(iptr->s1);
    dst = VAROP(iptr->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. */

        if (IS_INMEMORY(src->flags)) {
#if SIZEOF_VOID_P == 4
            if (IS_2_WORD_TYPE(src->type))
                d = codegen_reg_of_var(iptr->opc, dst, REG_ITMP12_PACKED);
            else
#endif
                d = codegen_reg_of_var(iptr->opc, dst, REG_IFTMP);
            s1 = emit_load(jd, iptr, src, d);
        }
        else {
            s1 = emit_load(jd, iptr, src, REG_IFTMP);
#if SIZEOF_VOID_P == 4
            if (IS_2_WORD_TYPE(src->type))
                d = codegen_reg_of_var(iptr->opc, dst, REG_ITMP12_PACKED);
            else
#endif
                d = codegen_reg_of_var(iptr->opc, dst, s1);
        }

        if (s1 != d) {
            switch (dst->type) {
#if SIZEOF_VOID_P == 8
            case TYPE_INT:
            case TYPE_LNG:
            case TYPE_ADR:
                M_MOV(s1, d);
                break;
#else
            case TYPE_INT:
            case TYPE_ADR:
                M_MOV(s1, d);
                break;
            case TYPE_LNG:
                M_LNGMOVE(s1, d);
                break;
#endif
            case TYPE_FLT:
                M_FMOV(s1, d);
                break;
            case TYPE_DBL:
                M_DMOV(s1, d);
                break;
            default:
                vm_abort("emit_copy: unknown type %d", dst->type);
                break;
            }
        }

        emit_store(jd, iptr, dst, d);
    }
}


/* emit_iconst *****************************************************************

   XXX

*******************************************************************************/

void emit_iconst(codegendata *cd, s4 d, s4 value)
{
    s4 disp;

    if ((value >= -32768) && (value <= 32767))
        M_IADD_IMM(REG_ZERO, value, d);
    else if ((value >= 0) && (value <= 0xffff))
        M_OR_IMM(REG_ZERO, value, d);
    else {
        disp = dseg_add_s4(cd, value);
        M_ILD(d, REG_PV, disp);
    }
}


/* emit_lconst *****************************************************************

   XXX

*******************************************************************************/

void emit_lconst(codegendata *cd, s4 d, s8 value)
{
    s4 disp;

#if SIZEOF_VOID_P == 8
    if ((value >= -32768) && (value <= 32767))
        M_LADD_IMM(REG_ZERO, value, d);
    else if ((value >= 0) && (value <= 0xffff))
        M_OR_IMM(REG_ZERO, value, d);
    else {
        disp = dseg_add_s8(cd, value);
        M_LLD(d, REG_PV, disp);
    }
#else
    disp = dseg_add_s8(cd, value);
    M_LLD(d, REG_PV, disp);
#endif
}


/* emit_branch *****************************************************************

   Emits the code for conditional and unconditional branchs.

   NOTE: The reg argument may contain two packed registers.

*******************************************************************************/

void emit_branch(codegendata *cd, s4 disp, s4 condition, s4 reg, u4 opt)
{
    // Calculate the displacements.
    int32_t checkdisp  = (disp - 4);
    int32_t branchdisp = (disp - 4) >> 2;

    /* check which branch to generate */

    if (condition == BRANCH_UNCONDITIONAL) {
        // Check displacement for overflow.
        if (opt_AlwaysEmitLongBranches || ((checkdisp < (int32_t) 0xffff8000) || (checkdisp > (int32_t) 0x00007fff))) {
            /* if the long-branches flag isn't set yet, do it */

            if (!CODEGENDATA_HAS_FLAG_LONGBRANCHES(cd)) {
                cd->flags |= (CODEGENDATA_FLAG_ERROR |
                              CODEGENDATA_FLAG_LONGBRANCHES);
            }

            // Calculate the offset relative to PV.
            int32_t currentrpc = cd->mcodeptr - cd->mcodebase;
            int32_t offset     = currentrpc + disp;

            // Sanity check.
            assert(offset % 4 == 0);

            // Do the long-branch.
            M_LUI(REG_ITMP3, offset >> 16);
            M_OR_IMM(REG_ITMP3, offset, REG_ITMP3);
            M_AADD(REG_PV, REG_ITMP3, REG_ITMP3);
            M_JMP(REG_ITMP3);
            M_NOP;
            M_NOP; // This nop is to have 6 instructions (see BRANCH_NOPS).
        }
        else {
            M_BR(branchdisp);
            M_NOP;
        }
    }
    else {
        // Check displacement for overflow.
        if (opt_AlwaysEmitLongBranches || ((checkdisp < (int32_t) 0xffff8000) || (checkdisp > (int32_t) 0x00007fff))) {
            /* if the long-branches flag isn't set yet, do it */

            if (!CODEGENDATA_HAS_FLAG_LONGBRANCHES(cd)) {
                cd->flags |= (CODEGENDATA_FLAG_ERROR |
                              CODEGENDATA_FLAG_LONGBRANCHES);
            }

            // Calculate the offset relative to PV before we generate
            // new code.
            int32_t currentrpc = cd->mcodeptr - cd->mcodebase;
            int32_t offset     = currentrpc + disp;

            // Sanity check.
            assert(offset % 4 == 0);

            switch (condition) {
            case BRANCH_EQ:
                M_BNE(GET_HIGH_REG(reg), GET_LOW_REG(reg), 5);
                break;
            case BRANCH_NE:
                M_BEQ(GET_HIGH_REG(reg), GET_LOW_REG(reg), 5);
                break;
            case BRANCH_LT:
                M_BGEZ(reg, 5);
                break;
            case BRANCH_GE:
                M_BLTZ(reg, 5);
                break;
            case BRANCH_GT:
                M_BLEZ(reg, 5);
                break;
            case BRANCH_LE:
                M_BGTZ(reg, 5);
                break;
            default:
                vm_abort("emit_branch: unknown condition %d", condition);
                break;
            }

            // The actual branch code which is over-jumped.  NOTE: We
            // don't use a branch delay slot for the conditional
            // branch.

            // Do the long-branch.
            M_LUI(REG_ITMP3, offset >> 16);
            M_OR_IMM(REG_ITMP3, offset, REG_ITMP3);
            M_AADD(REG_PV, REG_ITMP3, REG_ITMP3);
            M_JMP(REG_ITMP3);
            M_NOP;
        }
        else {
            switch (condition) {
            case BRANCH_EQ:
                M_BEQ(GET_HIGH_REG(reg), GET_LOW_REG(reg), branchdisp);
                break;
            case BRANCH_NE:
                M_BNE(GET_HIGH_REG(reg), GET_LOW_REG(reg), branchdisp);
                break;
            case BRANCH_LT:
                M_BLTZ(reg, branchdisp);
                break;
            case BRANCH_GE:
                M_BGEZ(reg, branchdisp);
                break;
            case BRANCH_GT:
                M_BGTZ(reg, branchdisp);
                break;
            case BRANCH_LE:
                M_BLEZ(reg, branchdisp);
                break;
            default:
                vm_abort("emit_branch: unknown condition %d", condition);
                break;
            }

            /* branch delay */
            M_NOP;
        }
    }
}


/* emit_arithmetic_check *******************************************************

   Emit an ArithmeticException check.

*******************************************************************************/

void emit_arithmetic_check(codegendata *cd, instruction *iptr, s4 reg)
{
    if (INSTRUCTION_MUST_CHECK(iptr)) {
        M_BNEZ(reg, 2);
        M_NOP;
        M_ALD_INTERN(REG_ZERO, REG_ZERO, TRAP_ArithmeticException);
    }
}


/* emit_arrayindexoutofbounds_check ********************************************

   Emit an ArrayIndexOutOfBoundsException check.

*******************************************************************************/

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_CMPULT(s2, REG_ITMP3, REG_ITMP3);
        M_BNEZ(REG_ITMP3, 2);
        M_NOP;
        M_ALD_INTERN(s2, REG_ZERO, TRAP_ArrayIndexOutOfBoundsException);
    }
}


/* emit_arraystore_check *******************************************************

   Emit an ArrayStoreException check.

*******************************************************************************/

void emit_arraystore_check(codegendata *cd, instruction *iptr)
{
    if (INSTRUCTION_MUST_CHECK(iptr)) {
        M_BNEZ(REG_RESULT, 2);
        M_NOP;
        M_ALD_INTERN(REG_RESULT, REG_ZERO, TRAP_ArrayStoreException);
    }
}


/* emit_classcast_check ********************************************************

   Emit a ClassCastException check.

*******************************************************************************/

void emit_classcast_check(codegendata *cd, instruction *iptr, s4 condition, s4 reg, s4 s1)
{
    if (INSTRUCTION_MUST_CHECK(iptr)) {
        switch (condition) {
        case ICMD_IFEQ:
            M_BNEZ(reg, 2);
            break;

        case ICMD_IFNE:
            M_BEQZ(reg, 2);
            break;

        case ICMD_IFLE:
            M_BGTZ(reg, 2);
            break;

        default:
            vm_abort("emit_classcast_check: unknown condition %d", condition);
            break;
        }

        M_NOP;
        M_ALD_INTERN(s1, REG_ZERO, TRAP_ClassCastException);
    }
}


/* emit_nullpointer_check ******************************************************

   Emit a NullPointerException check.

*******************************************************************************/

void emit_nullpointer_check(codegendata *cd, instruction *iptr, s4 reg)
{
    if (INSTRUCTION_MUST_CHECK(iptr)) {
        M_BNEZ(reg, 2);
        M_NOP;
        M_ALD_INTERN(REG_ZERO, REG_ZERO, TRAP_NullPointerException);
    }
}


/* emit_exception_check ********************************************************

   Emit an Exception check.

*******************************************************************************/

void emit_exception_check(codegendata *cd, instruction *iptr)
{
    if (INSTRUCTION_MUST_CHECK(iptr)) {
        M_BNEZ(REG_RESULT, 2);
        M_NOP;
        M_ALD_INTERN(REG_RESULT, REG_ZERO, TRAP_CHECK_EXCEPTION);
    }
}


/* emit_trap_compiler **********************************************************

   Emit a trap instruction which calls the JIT compiler.

*******************************************************************************/

void emit_trap_compiler(codegendata *cd)
{
    M_ALD_INTERN(REG_METHODPTR, REG_ZERO, TRAP_COMPILER);
}


void emit_abstractmethoderror_trap(codegendata *cd)
{
    M_ALD_INTERN(REG_ZERO, REG_ZERO, TRAP_AbstractMethodError);
}


/* emit_trap *******************************************************************

   Emit a trap instruction and return the original machine code.

*******************************************************************************/

uint32_t emit_trap(codegendata *cd)
{
    // Get machine code which is patched back in later. The trap is 1
    // instruction word long.
    uint32_t mcode = *((uint32_t*) cd->mcodeptr);

    M_RESERVED;

    return mcode;
}


/**
 * Emit code to recompute the procedure vector.
 */
void emit_recompute_pv(codegendata *cd)
{
    int32_t disp = (int32_t) (cd->mcodeptr - cd->mcodebase);

    M_LDA(REG_PV, REG_RA, -disp);
}


/**
 * Generates synchronization code to enter a monitor.
 */
void emit_monitor_enter(jitdata* jd, int32_t syncslot_offset)
{
    int32_t p;
    int32_t disp;

    // Get required compiler data.
    methodinfo*  m  = jd->m;
    codegendata* cd = jd->cd;

# if !defined(NDEBUG)
        if (JITDATA_HAS_FLAG_VERBOSECALL(jd)) {
            M_LDA(REG_SP, REG_SP, -(INT_ARG_CNT + FLT_ARG_CNT) * 8);

            for (p = 0; p < INT_ARG_CNT; p++)
                M_AST(abi_registers_integer_argument[p], REG_SP, p * 8);

            for (p = 0; p < FLT_ARG_CNT; p++)
                M_DST(abi_registers_float_argument[p], REG_SP, (INT_ARG_CNT + p) * 8);

            syncslot_offset += (INT_ARG_CNT + FLT_ARG_CNT) * 8;
        }
# endif

        /* get correct lock object */

        if (m->flags & ACC_STATIC) {
            disp = dseg_add_address(cd, &m->clazz->object.header);
            M_ALD(REG_A0, REG_PV, disp);
            disp = dseg_add_functionptr(cd, LOCK_monitor_enter);
            M_ALD(REG_ITMP3, REG_PV, disp);
        }
        else {
/*          emit_nullpointer_check(cd, iptr, REG_A0); */
            M_BNEZ(REG_A0, 2);
            disp = dseg_add_functionptr(cd, LOCK_monitor_enter);
            M_ALD(REG_ITMP3, REG_PV, disp);                   /* branch delay */
            M_ALD_INTERN(REG_ZERO, REG_ZERO, TRAP_NullPointerException);
        }

        M_JSR(REG_RA, REG_ITMP3);
        M_AST(REG_A0, REG_SP, syncslot_offset);               /* branch delay */

# if !defined(NDEBUG)
        if (JITDATA_HAS_FLAG_VERBOSECALL(jd)) {
            for (p = 0; p < INT_ARG_CNT; p++)
                M_ALD(abi_registers_integer_argument[p], REG_SP, p * 8);

            for (p = 0; p < FLT_ARG_CNT; p++)
                M_DLD(abi_registers_float_argument[p], REG_SP, (INT_ARG_CNT + p) * 8);


            M_LDA(REG_SP, REG_SP, (INT_ARG_CNT + FLT_ARG_CNT) * 8);
        }
# endif
}


/**
 * Generates synchronization code to leave a monitor.
 */
void emit_monitor_exit(jitdata* jd, int32_t syncslot_offset)
{
    int32_t disp;

    // Get required compiler data.
    methodinfo*  m  = jd->m;
    codegendata* cd = jd->cd;

    disp = dseg_add_functionptr(cd, LOCK_monitor_exit);
    M_ALD(REG_ITMP3, REG_PV, disp);

    /* we need to save the proper return value */

    methoddesc* md = m->parseddesc;

    switch (md->returntype.type) {
    case TYPE_INT:
    case TYPE_ADR:
#if SIZEOF_VOID_P == 8
    case TYPE_LNG:
#endif
        M_ALD(REG_A0, REG_SP, syncslot_offset);
        M_JSR(REG_RA, REG_ITMP3);
        M_AST(REG_RESULT, REG_SP, syncslot_offset);  /* delay slot */
        break;
#if SIZEOF_VOID_P == 4
    case TYPE_LNG:
        M_ALD(REG_A0, REG_SP, syncslot_offset);
        M_LST(REG_RESULT_PACKED, REG_SP, syncslot_offset);
        M_JSR(REG_RA, REG_ITMP3);
        M_NOP;
        break;
#endif
    case TYPE_FLT:
    case TYPE_DBL:
        M_ALD(REG_A0, REG_SP, syncslot_offset);
        M_JSR(REG_RA, REG_ITMP3);
        M_DST(REG_FRESULT, REG_SP, syncslot_offset); /* delay slot */
        break;
    default:
        M_JSR(REG_RA, REG_ITMP3);
        M_ALD(REG_A0, REG_SP, syncslot_offset); /* delay*/
        break;
    }

    /* and now restore the proper return value */

    switch (md->returntype.type) {
    case TYPE_INT:
    case TYPE_ADR:
#if SIZEOF_VOID_P == 8
    case TYPE_LNG:
#endif
        M_ALD(REG_RESULT, REG_SP, syncslot_offset);
        break;
#if SIZEOF_VOID_P == 4
    case TYPE_LNG:
        M_LLD(REG_RESULT_PACKED, REG_SP, syncslot_offset);
        break;
#endif
    case TYPE_FLT:
    case TYPE_DBL:
        M_DLD(REG_FRESULT, REG_SP, syncslot_offset);
        break;
    case TYPE_VOID:
        break;
    default:
        break;
    }
}


/* emit_verbosecall_enter ******************************************************

   Generates the code for the call trace.

*******************************************************************************/

#if !defined(NDEBUG)
void emit_verbosecall_enter(jitdata *jd)
{
    methodinfo   *m;
    codeinfo     *code;
    codegendata  *cd;
    registerdata *rd;
    methoddesc   *md;
    s4            disp;
    s4            i, s;

    /* get required compiler data */

    m    = jd->m;
    code = jd->code;
    cd   = jd->cd;
    rd   = jd->rd;

    md = m->parseddesc;

    /* mark trace code */

    M_NOP;

    /* keep stack 16-byte aligned */

    M_LDA(REG_SP, REG_SP, -(PA_SIZE + (md->paramcount + 2 + TMP_CNT) * 8));
    M_AST(REG_RA, REG_SP, PA_SIZE + md->paramcount * 8);

    /* save argument registers (we store the registers as address
       types, so it's correct for MIPS32 too) */

    for (i = 0; i < md->paramcount; i++) {
        if (!md->params[i].inmemory) {
            s = md->params[i].regoff;
            switch (md->paramtypes[i].type) {
            case TYPE_ADR:
            case TYPE_INT:
                M_AST(s, REG_SP, PA_SIZE + i * 8);
                break;
            case TYPE_LNG:
                M_LST(s, REG_SP, PA_SIZE + i * 8);
                break;
            case TYPE_FLT:
                M_FST(s, REG_SP, PA_SIZE + i * 8);
                break;
            case TYPE_DBL:
                M_DST(s, REG_SP, PA_SIZE + i * 8);
                break;
            default:
                assert(false);
                break;
            }
        }
    }

    /* save temporary registers for leaf methods */

    if (code_is_leafmethod(code)) {
        for (i = 0; i < INT_TMP_CNT; i++)
            M_AST(rd->tmpintregs[i], REG_SP, PA_SIZE + (md->paramcount + 2 + i) * 8);

        for (i = 0; i < FLT_TMP_CNT; i++)
            M_DST(rd->tmpfltregs[i], REG_SP, PA_SIZE + (md->paramcount + 2 + INT_TMP_CNT + i) * 8);
    }

    disp = dseg_add_address(cd, m);
    M_ALD(REG_A0, REG_PV, disp);
    M_LDA(REG_A1, REG_SP, PA_SIZE);
    M_LDA(REG_A2, REG_SP, PA_SIZE + (md->paramcount + 2 + TMP_CNT) * 8 + cd->stackframesize * 8);
    disp = dseg_add_functionptr(cd, trace_java_call_enter);
    M_ALD(REG_ITMP3, REG_PV, disp);
    M_JSR(REG_RA, REG_ITMP3);
    M_NOP;

    /* restore argument registers */

    for (i = 0; i < md->paramcount; i++) {
        if (!md->params[i].inmemory) {
            s = md->params[i].regoff;
            switch (md->paramtypes[i].type) {
            case TYPE_ADR:
            case TYPE_INT:
                M_ALD(s, REG_SP, PA_SIZE + i * 8);
                break;
            case TYPE_LNG:
                M_LLD(s, REG_SP, PA_SIZE + i * 8);
                break;
            case TYPE_FLT:
                M_FLD(s, REG_SP, PA_SIZE + i * 8);
                break;
            case TYPE_DBL:
                M_DLD(s, REG_SP, PA_SIZE + i * 8);
                break;
            default:
                assert(false);
                break;
            }
        }
    }

    /* restore temporary registers for leaf methods */

    if (code_is_leafmethod(code)) {
        for (i = 0; i < INT_TMP_CNT; i++)
            M_ALD(rd->tmpintregs[i], REG_SP, PA_SIZE + (md->paramcount + 2 + i) * 8);

        for (i = 0; i < FLT_TMP_CNT; i++)
            M_DLD(rd->tmpfltregs[i], REG_SP, PA_SIZE + (md->paramcount + 2 + INT_TMP_CNT + i) * 8);
    }

    /* keep stack 16-byte aligned */

    M_ALD(REG_RA, REG_SP, PA_SIZE + md->paramcount * 8);
    M_LDA(REG_SP, REG_SP, PA_SIZE + (md->paramcount + 2 + TMP_CNT) * 8);

    /* mark trace code */

    M_NOP;
}
#endif /* !defined(NDEBUG) */


/* emit_verbosecall_exit *******************************************************

   Generates the code for the call trace.

*******************************************************************************/

#if !defined(NDEBUG)
void emit_verbosecall_exit(jitdata *jd)
{
    methodinfo   *m;
    codegendata  *cd;
    registerdata *rd;
    methoddesc   *md;
    s4            disp;

    /* get required compiler data */

    m  = jd->m;
    cd = jd->cd;
    rd = jd->rd;

    md = m->parseddesc;

    /* mark trace code */

    M_NOP;

    /* keep stack 16-byte aligned */

#if SIZEOF_VOID_P == 8
    assert(0); // XXX: Revisit this code for MIPS64!
#endif
    M_ASUB_IMM(REG_SP, PA_SIZE + 2 * 8, REG_SP);
    M_AST(REG_RA, REG_SP, PA_SIZE + 1 * 8);

    /* save return value */

    switch (md->returntype.type) {
    case TYPE_ADR:
    case TYPE_INT:
        M_AST(REG_RESULT, REG_SP, PA_SIZE + 0 * 8);
        break;
    case TYPE_LNG:
#if SIZEOF_VOID_P == 8
        M_LST(REG_RESULT, REG_SP, PA_SIZE + 0 * 8);
#else
        M_LST(REG_RESULT_PACKED, REG_SP, PA_SIZE + 0 * 8);
#endif
        break;
    case TYPE_FLT:
        M_FST(REG_FRESULT, REG_SP, PA_SIZE + 0 * 8);
        break;
    case TYPE_DBL:
        M_DST(REG_FRESULT, REG_SP, PA_SIZE + 0 * 8);
        break;
    case TYPE_VOID:
        break;
    default:
        assert(false);
        break;
    }

    disp = dseg_add_address(cd, m);
    M_ALD(REG_A0, REG_PV, disp);
    M_AADD_IMM(REG_SP, PA_SIZE, REG_A1);
    disp = dseg_add_functionptr(cd, trace_java_call_exit);
    M_ALD(REG_ITMP3, REG_PV, disp);
    M_JSR(REG_RA, REG_ITMP3);
    M_NOP;

    /* restore return value */

    switch (md->returntype.type) {
    case TYPE_ADR:
    case TYPE_INT:
        M_ALD(REG_RESULT, REG_SP, PA_SIZE + 0 * 8);
        break;
    case TYPE_LNG:
#if SIZEOF_VOID_P == 8
        M_LLD(REG_RESULT, REG_SP, PA_SIZE + 0 * 8);
#else
        M_LLD(REG_RESULT_PACKED, REG_SP, PA_SIZE + 0 * 8);
#endif
        break;
    case TYPE_FLT:
        M_FLD(REG_FRESULT, REG_SP, PA_SIZE + 0 * 8);
        break;
    case TYPE_DBL:
        M_DLD(REG_FRESULT, REG_SP, PA_SIZE + 0 * 8);
        break;
    case TYPE_VOID:
        break;
    default:
        assert(false);
        break;
    }

    /* keep stack 16-byte aligned */

    M_ALD(REG_RA, REG_SP, PA_SIZE + 1 * 8);
    M_AADD_IMM(REG_SP, PA_SIZE + 2 * 8, REG_SP);

    /* mark trace code */

    M_NOP;
}
#endif /* !defined(NDEBUG) */


/*
 * These are local overrides for various environment variables in Emacs.
 * Please do not remove this and leave it at the end of the file, where
 * Emacs will automagically detect them.
 * ---------------------------------------------------------------------
 * Local variables:
 * mode: c++
 * indent-tabs-mode: t
 * c-basic-offset: 4
 * tab-width: 4
 * End:
 * vim:noexpandtab:sw=4:ts=4:
 */