target/microblaze/op_helper.c - qemu - Git at Google

 /*
  *  Microblaze helper routines.
  *
  *  Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>.
  *  Copyright (c) 2009-2012 PetaLogix Qld Pty Ltd.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * This library 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */

 #include "qemu/osdep.h"
 #include "qemu/log.h"
 #include "cpu.h"
 #include "exec/helper-proto.h"
 #include "qemu/host-utils.h"
 #include "exec/exec-all.h"
 #include "exec/cpu_ldst.h"
 #include "fpu/softfloat.h"

 void helper_put(uint32_t id, uint32_t ctrl, uint32_t data)
 {
     int test = ctrl & STREAM_TEST;
     int atomic = ctrl & STREAM_ATOMIC;
     int control = ctrl & STREAM_CONTROL;
     int nonblock = ctrl & STREAM_NONBLOCK;
     int exception = ctrl & STREAM_EXCEPTION;

     qemu_log_mask(LOG_UNIMP, "Unhandled stream put to stream-id=%d data=%x %s%s%s%s%s\n",
              id, data,
              test ? "t" : "",
              nonblock ? "n" : "",
              exception ? "e" : "",
              control ? "c" : "",
              atomic ? "a" : "");
 }

 uint32_t helper_get(uint32_t id, uint32_t ctrl)
 {
     int test = ctrl & STREAM_TEST;
     int atomic = ctrl & STREAM_ATOMIC;
     int control = ctrl & STREAM_CONTROL;
     int nonblock = ctrl & STREAM_NONBLOCK;
     int exception = ctrl & STREAM_EXCEPTION;

     qemu_log_mask(LOG_UNIMP, "Unhandled stream get from stream-id=%d %s%s%s%s%s\n",
              id,
              test ? "t" : "",
              nonblock ? "n" : "",
              exception ? "e" : "",
              control ? "c" : "",
              atomic ? "a" : "");
     return 0xdead0000 | id;
 }

 void helper_raise_exception(CPUMBState *env, uint32_t index)
 {
     CPUState *cs = env_cpu(env);

     cs->exception_index = index;
     cpu_loop_exit(cs);
 }

 static bool check_divz(CPUMBState *env, uint32_t a, uint32_t b, uintptr_t ra)
 {
     if (unlikely(b == 0)) {
         env->msr |= MSR_DZ;

         if ((env->msr & MSR_EE) &&
             env_archcpu(env)->cfg.div_zero_exception) {
             CPUState *cs = env_cpu(env);

             env->esr = ESR_EC_DIVZERO;
             cs->exception_index = EXCP_HW_EXCP;
             cpu_loop_exit_restore(cs, ra);
         }
         return false;
     }
     return true;
 }

 uint32_t helper_divs(CPUMBState *env, uint32_t a, uint32_t b)
 {
     if (!check_divz(env, a, b, GETPC())) {
         return 0;
     }
     return (int32_t)a / (int32_t)b;
 }

 uint32_t helper_divu(CPUMBState *env, uint32_t a, uint32_t b)
 {
     if (!check_divz(env, a, b, GETPC())) {
         return 0;
     }
     return a / b;
 }

 /* raise FPU exception.  */
 static void raise_fpu_exception(CPUMBState *env, uintptr_t ra)
 {
     CPUState *cs = env_cpu(env);

     env->esr = ESR_EC_FPU;
     cs->exception_index = EXCP_HW_EXCP;
     cpu_loop_exit_restore(cs, ra);
 }

 static void update_fpu_flags(CPUMBState *env, int flags, uintptr_t ra)
 {
     int raise = 0;

     if (flags & float_flag_invalid) {
         env->fsr |= FSR_IO;
         raise = 1;
     }
     if (flags & float_flag_divbyzero) {
         env->fsr |= FSR_DZ;
         raise = 1;
     }
     if (flags & float_flag_overflow) {
         env->fsr |= FSR_OF;
         raise = 1;
     }
     if (flags & float_flag_underflow) {
         env->fsr |= FSR_UF;
         raise = 1;
     }
     if (raise
         && (env_archcpu(env)->cfg.pvr_regs[2] & PVR2_FPU_EXC_MASK)
         && (env->msr & MSR_EE)) {
         raise_fpu_exception(env, ra);
     }
 }

 uint32_t helper_fadd(CPUMBState *env, uint32_t a, uint32_t b)
 {
     CPU_FloatU fd, fa, fb;
     int flags;

     set_float_exception_flags(0, &env->fp_status);
     fa.l = a;
     fb.l = b;
     fd.f = float32_add(fa.f, fb.f, &env->fp_status);

     flags = get_float_exception_flags(&env->fp_status);
     update_fpu_flags(env, flags, GETPC());
     return fd.l;
 }

 uint32_t helper_frsub(CPUMBState *env, uint32_t a, uint32_t b)
 {
     CPU_FloatU fd, fa, fb;
     int flags;

     set_float_exception_flags(0, &env->fp_status);
     fa.l = a;
     fb.l = b;
     fd.f = float32_sub(fb.f, fa.f, &env->fp_status);
     flags = get_float_exception_flags(&env->fp_status);
     update_fpu_flags(env, flags, GETPC());
     return fd.l;
 }

 uint32_t helper_fmul(CPUMBState *env, uint32_t a, uint32_t b)
 {
     CPU_FloatU fd, fa, fb;
     int flags;

     set_float_exception_flags(0, &env->fp_status);
     fa.l = a;
     fb.l = b;
     fd.f = float32_mul(fa.f, fb.f, &env->fp_status);
     flags = get_float_exception_flags(&env->fp_status);
     update_fpu_flags(env, flags, GETPC());

     return fd.l;
 }

 uint32_t helper_fdiv(CPUMBState *env, uint32_t a, uint32_t b)
 {
     CPU_FloatU fd, fa, fb;
     int flags;

     set_float_exception_flags(0, &env->fp_status);
     fa.l = a;
     fb.l = b;
     fd.f = float32_div(fb.f, fa.f, &env->fp_status);
     flags = get_float_exception_flags(&env->fp_status);
     update_fpu_flags(env, flags, GETPC());

     return fd.l;
 }

 uint32_t helper_fcmp_un(CPUMBState *env, uint32_t a, uint32_t b)
 {
     CPU_FloatU fa, fb;
     uint32_t r = 0;

     fa.l = a;
     fb.l = b;

     if (float32_is_signaling_nan(fa.f, &env->fp_status) ||
         float32_is_signaling_nan(fb.f, &env->fp_status)) {
         update_fpu_flags(env, float_flag_invalid, GETPC());
         r = 1;
     }

     if (float32_is_quiet_nan(fa.f, &env->fp_status) ||
         float32_is_quiet_nan(fb.f, &env->fp_status)) {
         r = 1;
     }

     return r;
 }

 uint32_t helper_fcmp_lt(CPUMBState *env, uint32_t a, uint32_t b)
 {
     CPU_FloatU fa, fb;
     int r;
     int flags;

     set_float_exception_flags(0, &env->fp_status);
     fa.l = a;
     fb.l = b;
     r = float32_lt(fb.f, fa.f, &env->fp_status);
     flags = get_float_exception_flags(&env->fp_status);
     update_fpu_flags(env, flags & float_flag_invalid, GETPC());

     return r;
 }

 uint32_t helper_fcmp_eq(CPUMBState *env, uint32_t a, uint32_t b)
 {
     CPU_FloatU fa, fb;
     int flags;
     int r;

     set_float_exception_flags(0, &env->fp_status);
     fa.l = a;
     fb.l = b;
     r = float32_eq_quiet(fa.f, fb.f, &env->fp_status);
     flags = get_float_exception_flags(&env->fp_status);
     update_fpu_flags(env, flags & float_flag_invalid, GETPC());

     return r;
 }

 uint32_t helper_fcmp_le(CPUMBState *env, uint32_t a, uint32_t b)
 {
     CPU_FloatU fa, fb;
     int flags;
     int r;

     fa.l = a;
     fb.l = b;
     set_float_exception_flags(0, &env->fp_status);
     r = float32_le(fa.f, fb.f, &env->fp_status);
     flags = get_float_exception_flags(&env->fp_status);
     update_fpu_flags(env, flags & float_flag_invalid, GETPC());


     return r;
 }

 uint32_t helper_fcmp_gt(CPUMBState *env, uint32_t a, uint32_t b)
 {
     CPU_FloatU fa, fb;
     int flags, r;

     fa.l = a;
     fb.l = b;
     set_float_exception_flags(0, &env->fp_status);
     r = float32_lt(fa.f, fb.f, &env->fp_status);
     flags = get_float_exception_flags(&env->fp_status);
     update_fpu_flags(env, flags & float_flag_invalid, GETPC());
     return r;
 }

 uint32_t helper_fcmp_ne(CPUMBState *env, uint32_t a, uint32_t b)
 {
     CPU_FloatU fa, fb;
     int flags, r;

     fa.l = a;
     fb.l = b;
     set_float_exception_flags(0, &env->fp_status);
     r = !float32_eq_quiet(fa.f, fb.f, &env->fp_status);
     flags = get_float_exception_flags(&env->fp_status);
     update_fpu_flags(env, flags & float_flag_invalid, GETPC());

     return r;
 }

 uint32_t helper_fcmp_ge(CPUMBState *env, uint32_t a, uint32_t b)
 {
     CPU_FloatU fa, fb;
     int flags, r;

     fa.l = a;
     fb.l = b;
     set_float_exception_flags(0, &env->fp_status);
     r = !float32_lt(fa.f, fb.f, &env->fp_status);
     flags = get_float_exception_flags(&env->fp_status);
     update_fpu_flags(env, flags & float_flag_invalid, GETPC());

     return r;
 }

 uint32_t helper_flt(CPUMBState *env, uint32_t a)
 {
     CPU_FloatU fd, fa;

     fa.l = a;
     fd.f = int32_to_float32(fa.l, &env->fp_status);
     return fd.l;
 }

 uint32_t helper_fint(CPUMBState *env, uint32_t a)
 {
     CPU_FloatU fa;
     uint32_t r;
     int flags;

     set_float_exception_flags(0, &env->fp_status);
     fa.l = a;
     r = float32_to_int32(fa.f, &env->fp_status);
     flags = get_float_exception_flags(&env->fp_status);
     update_fpu_flags(env, flags, GETPC());

     return r;
 }

 uint32_t helper_fsqrt(CPUMBState *env, uint32_t a)
 {
     CPU_FloatU fd, fa;
     int flags;

     set_float_exception_flags(0, &env->fp_status);
     fa.l = a;
     fd.l = float32_sqrt(fa.f, &env->fp_status);
     flags = get_float_exception_flags(&env->fp_status);
     update_fpu_flags(env, flags, GETPC());

     return fd.l;
 }

 uint32_t helper_pcmpbf(uint32_t a, uint32_t b)
 {
     unsigned int i;
     uint32_t mask = 0xff000000;

     for (i = 0; i < 4; i++) {
         if ((a & mask) == (b & mask))
             return i + 1;
         mask >>= 8;
     }
     return 0;
 }

 void helper_stackprot(CPUMBState *env, target_ulong addr)
 {
     if (addr < env->slr || addr > env->shr) {
         CPUState *cs = env_cpu(env);

         qemu_log_mask(CPU_LOG_INT, "Stack protector violation at "
                       TARGET_FMT_lx " %x %x\n",
                       addr, env->slr, env->shr);

         env->ear = addr;
         env->esr = ESR_EC_STACKPROT;
         cs->exception_index = EXCP_HW_EXCP;
         cpu_loop_exit_restore(cs, GETPC());
     }
 }

 #if !defined(CONFIG_USER_ONLY)
 /* Writes/reads to the MMU's special regs end up here.  */
 uint32_t helper_mmu_read(CPUMBState *env, uint32_t ext, uint32_t rn)
 {
     return mmu_read(env, ext, rn);
 }

 void helper_mmu_write(CPUMBState *env, uint32_t ext, uint32_t rn, uint32_t v)
 {
     mmu_write(env, ext, rn, v);
 }

 void mb_cpu_transaction_failed(CPUState *cs, hwaddr physaddr, vaddr addr,
                                unsigned size, MMUAccessType access_type,
                                int mmu_idx, MemTxAttrs attrs,
                                MemTxResult response, uintptr_t retaddr)
 {
     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
     CPUMBState *env = &cpu->env;

     qemu_log_mask(CPU_LOG_INT, "Transaction failed: vaddr 0x%" VADDR_PRIx
                   " physaddr 0x" TARGET_FMT_plx " size %d access type %s\n",
                   addr, physaddr, size,
                   access_type == MMU_INST_FETCH ? "INST_FETCH" :
                   (access_type == MMU_DATA_LOAD ? "DATA_LOAD" : "DATA_STORE"));

     if (!(env->msr & MSR_EE)) {
         return;
     }

     if (access_type == MMU_INST_FETCH) {
         if (!cpu->cfg.iopb_bus_exception) {
             return;
         }
         env->esr = ESR_EC_INSN_BUS;
     } else {
         if (!cpu->cfg.dopb_bus_exception) {
             return;
         }
         env->esr = ESR_EC_DATA_BUS;
     }

     env->ear = addr;
     cs->exception_index = EXCP_HW_EXCP;
     cpu_loop_exit_restore(cs, retaddr);
 }
 #endif
	/*
	* Microblaze helper routines.
	*
	* Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>.
	* Copyright (c) 2009-2012 PetaLogix Qld Pty Ltd.
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2.1 of the License, or (at your option) any later version.
	*
	* This library 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
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this library; if not, see <http://www.gnu.org/licenses/>.
	*/

	#include "qemu/osdep.h"
	#include "qemu/log.h"
	#include "cpu.h"
	#include "exec/helper-proto.h"
	#include "qemu/host-utils.h"
	#include "exec/exec-all.h"
	#include "exec/cpu_ldst.h"
	#include "fpu/softfloat.h"

	void helper_put(uint32_t id, uint32_t ctrl, uint32_t data)
	{
	int test = ctrl & STREAM_TEST;
	int atomic = ctrl & STREAM_ATOMIC;
	int control = ctrl & STREAM_CONTROL;
	int nonblock = ctrl & STREAM_NONBLOCK;
	int exception = ctrl & STREAM_EXCEPTION;

	qemu_log_mask(LOG_UNIMP, "Unhandled stream put to stream-id=%d data=%x %s%s%s%s%s\n",
	id, data,
	test ? "t" : "",
	nonblock ? "n" : "",
	exception ? "e" : "",
	control ? "c" : "",
	atomic ? "a" : "");
	}

	uint32_t helper_get(uint32_t id, uint32_t ctrl)
	{
	int test = ctrl & STREAM_TEST;
	int atomic = ctrl & STREAM_ATOMIC;
	int control = ctrl & STREAM_CONTROL;
	int nonblock = ctrl & STREAM_NONBLOCK;
	int exception = ctrl & STREAM_EXCEPTION;

	qemu_log_mask(LOG_UNIMP, "Unhandled stream get from stream-id=%d %s%s%s%s%s\n",
	id,
	test ? "t" : "",
	nonblock ? "n" : "",
	exception ? "e" : "",
	control ? "c" : "",
	atomic ? "a" : "");
	return 0xdead0000 \| id;
	}

	void helper_raise_exception(CPUMBState *env, uint32_t index)
	{
	CPUState *cs = env_cpu(env);

	cs->exception_index = index;
	cpu_loop_exit(cs);
	}

	static bool check_divz(CPUMBState *env, uint32_t a, uint32_t b, uintptr_t ra)
	{
	if (unlikely(b == 0)) {
	env->msr \|= MSR_DZ;

	if ((env->msr & MSR_EE) &&
	env_archcpu(env)->cfg.div_zero_exception) {
	CPUState *cs = env_cpu(env);

	env->esr = ESR_EC_DIVZERO;
	cs->exception_index = EXCP_HW_EXCP;
	cpu_loop_exit_restore(cs, ra);
	}
	return false;
	}
	return true;
	}

	uint32_t helper_divs(CPUMBState *env, uint32_t a, uint32_t b)
	{
	if (!check_divz(env, a, b, GETPC())) {
	return 0;
	}
	return (int32_t)a / (int32_t)b;
	}

	uint32_t helper_divu(CPUMBState *env, uint32_t a, uint32_t b)
	{
	if (!check_divz(env, a, b, GETPC())) {
	return 0;
	}
	return a / b;
	}

	/* raise FPU exception. */
	static void raise_fpu_exception(CPUMBState *env, uintptr_t ra)
	{
	CPUState *cs = env_cpu(env);

	env->esr = ESR_EC_FPU;
	cs->exception_index = EXCP_HW_EXCP;
	cpu_loop_exit_restore(cs, ra);
	}

	static void update_fpu_flags(CPUMBState *env, int flags, uintptr_t ra)
	{
	int raise = 0;

	if (flags & float_flag_invalid) {
	env->fsr \|= FSR_IO;
	raise = 1;
	}
	if (flags & float_flag_divbyzero) {
	env->fsr \|= FSR_DZ;
	raise = 1;
	}
	if (flags & float_flag_overflow) {
	env->fsr \|= FSR_OF;
	raise = 1;
	}
	if (flags & float_flag_underflow) {
	env->fsr \|= FSR_UF;
	raise = 1;
	}
	if (raise
	&& (env_archcpu(env)->cfg.pvr_regs[2] & PVR2_FPU_EXC_MASK)
	&& (env->msr & MSR_EE)) {
	raise_fpu_exception(env, ra);
	}
	}

	uint32_t helper_fadd(CPUMBState *env, uint32_t a, uint32_t b)
	{
	CPU_FloatU fd, fa, fb;
	int flags;

	set_float_exception_flags(0, &env->fp_status);
	fa.l = a;
	fb.l = b;
	fd.f = float32_add(fa.f, fb.f, &env->fp_status);

	flags = get_float_exception_flags(&env->fp_status);
	update_fpu_flags(env, flags, GETPC());
	return fd.l;
	}

	uint32_t helper_frsub(CPUMBState *env, uint32_t a, uint32_t b)
	{
	CPU_FloatU fd, fa, fb;
	int flags;

	set_float_exception_flags(0, &env->fp_status);
	fa.l = a;
	fb.l = b;
	fd.f = float32_sub(fb.f, fa.f, &env->fp_status);
	flags = get_float_exception_flags(&env->fp_status);
	update_fpu_flags(env, flags, GETPC());
	return fd.l;
	}

	uint32_t helper_fmul(CPUMBState *env, uint32_t a, uint32_t b)
	{
	CPU_FloatU fd, fa, fb;
	int flags;

	set_float_exception_flags(0, &env->fp_status);
	fa.l = a;
	fb.l = b;
	fd.f = float32_mul(fa.f, fb.f, &env->fp_status);
	flags = get_float_exception_flags(&env->fp_status);
	update_fpu_flags(env, flags, GETPC());

	return fd.l;
	}

	uint32_t helper_fdiv(CPUMBState *env, uint32_t a, uint32_t b)
	{
	CPU_FloatU fd, fa, fb;
	int flags;

	set_float_exception_flags(0, &env->fp_status);
	fa.l = a;
	fb.l = b;
	fd.f = float32_div(fb.f, fa.f, &env->fp_status);
	flags = get_float_exception_flags(&env->fp_status);
	update_fpu_flags(env, flags, GETPC());

	return fd.l;
	}

	uint32_t helper_fcmp_un(CPUMBState *env, uint32_t a, uint32_t b)
	{
	CPU_FloatU fa, fb;
	uint32_t r = 0;

	fa.l = a;
	fb.l = b;

	if (float32_is_signaling_nan(fa.f, &env->fp_status) \|\|
	float32_is_signaling_nan(fb.f, &env->fp_status)) {
	update_fpu_flags(env, float_flag_invalid, GETPC());
	r = 1;
	}

	if (float32_is_quiet_nan(fa.f, &env->fp_status) \|\|
	float32_is_quiet_nan(fb.f, &env->fp_status)) {
	r = 1;
	}

	return r;
	}

	uint32_t helper_fcmp_lt(CPUMBState *env, uint32_t a, uint32_t b)
	{
	CPU_FloatU fa, fb;
	int r;
	int flags;

	set_float_exception_flags(0, &env->fp_status);
	fa.l = a;
	fb.l = b;
	r = float32_lt(fb.f, fa.f, &env->fp_status);
	flags = get_float_exception_flags(&env->fp_status);
	update_fpu_flags(env, flags & float_flag_invalid, GETPC());

	return r;
	}

	uint32_t helper_fcmp_eq(CPUMBState *env, uint32_t a, uint32_t b)
	{
	CPU_FloatU fa, fb;
	int flags;
	int r;

	set_float_exception_flags(0, &env->fp_status);
	fa.l = a;
	fb.l = b;
	r = float32_eq_quiet(fa.f, fb.f, &env->fp_status);
	flags = get_float_exception_flags(&env->fp_status);
	update_fpu_flags(env, flags & float_flag_invalid, GETPC());

	return r;
	}

	uint32_t helper_fcmp_le(CPUMBState *env, uint32_t a, uint32_t b)
	{
	CPU_FloatU fa, fb;
	int flags;
	int r;

	fa.l = a;
	fb.l = b;
	set_float_exception_flags(0, &env->fp_status);
	r = float32_le(fa.f, fb.f, &env->fp_status);
	flags = get_float_exception_flags(&env->fp_status);
	update_fpu_flags(env, flags & float_flag_invalid, GETPC());


	return r;
	}

	uint32_t helper_fcmp_gt(CPUMBState *env, uint32_t a, uint32_t b)
	{
	CPU_FloatU fa, fb;
	int flags, r;

	fa.l = a;
	fb.l = b;
	set_float_exception_flags(0, &env->fp_status);
	r = float32_lt(fa.f, fb.f, &env->fp_status);
	flags = get_float_exception_flags(&env->fp_status);
	update_fpu_flags(env, flags & float_flag_invalid, GETPC());
	return r;
	}

	uint32_t helper_fcmp_ne(CPUMBState *env, uint32_t a, uint32_t b)
	{
	CPU_FloatU fa, fb;
	int flags, r;

	fa.l = a;
	fb.l = b;
	set_float_exception_flags(0, &env->fp_status);
	r = !float32_eq_quiet(fa.f, fb.f, &env->fp_status);
	flags = get_float_exception_flags(&env->fp_status);
	update_fpu_flags(env, flags & float_flag_invalid, GETPC());

	return r;
	}

	uint32_t helper_fcmp_ge(CPUMBState *env, uint32_t a, uint32_t b)
	{
	CPU_FloatU fa, fb;
	int flags, r;

	fa.l = a;
	fb.l = b;
	set_float_exception_flags(0, &env->fp_status);
	r = !float32_lt(fa.f, fb.f, &env->fp_status);
	flags = get_float_exception_flags(&env->fp_status);
	update_fpu_flags(env, flags & float_flag_invalid, GETPC());

	return r;
	}

	uint32_t helper_flt(CPUMBState *env, uint32_t a)
	{
	CPU_FloatU fd, fa;

	fa.l = a;
	fd.f = int32_to_float32(fa.l, &env->fp_status);
	return fd.l;
	}

	uint32_t helper_fint(CPUMBState *env, uint32_t a)
	{
	CPU_FloatU fa;
	uint32_t r;
	int flags;

	set_float_exception_flags(0, &env->fp_status);
	fa.l = a;
	r = float32_to_int32(fa.f, &env->fp_status);
	flags = get_float_exception_flags(&env->fp_status);
	update_fpu_flags(env, flags, GETPC());

	return r;
	}

	uint32_t helper_fsqrt(CPUMBState *env, uint32_t a)
	{
	CPU_FloatU fd, fa;
	int flags;

	set_float_exception_flags(0, &env->fp_status);
	fa.l = a;
	fd.l = float32_sqrt(fa.f, &env->fp_status);
	flags = get_float_exception_flags(&env->fp_status);
	update_fpu_flags(env, flags, GETPC());

	return fd.l;
	}

	uint32_t helper_pcmpbf(uint32_t a, uint32_t b)
	{
	unsigned int i;
	uint32_t mask = 0xff000000;

	for (i = 0; i < 4; i++) {
	if ((a & mask) == (b & mask))
	return i + 1;
	mask >>= 8;
	}
	return 0;
	}

	void helper_stackprot(CPUMBState *env, target_ulong addr)
	{
	if (addr < env->slr \|\| addr > env->shr) {
	CPUState *cs = env_cpu(env);

	qemu_log_mask(CPU_LOG_INT, "Stack protector violation at "
	TARGET_FMT_lx " %x %x\n",
	addr, env->slr, env->shr);

	env->ear = addr;
	env->esr = ESR_EC_STACKPROT;
	cs->exception_index = EXCP_HW_EXCP;
	cpu_loop_exit_restore(cs, GETPC());
	}
	}

	#if !defined(CONFIG_USER_ONLY)
	/* Writes/reads to the MMU's special regs end up here. */
	uint32_t helper_mmu_read(CPUMBState *env, uint32_t ext, uint32_t rn)
	{
	return mmu_read(env, ext, rn);
	}

	void helper_mmu_write(CPUMBState *env, uint32_t ext, uint32_t rn, uint32_t v)
	{
	mmu_write(env, ext, rn, v);
	}

	void mb_cpu_transaction_failed(CPUState *cs, hwaddr physaddr, vaddr addr,
	unsigned size, MMUAccessType access_type,
	int mmu_idx, MemTxAttrs attrs,
	MemTxResult response, uintptr_t retaddr)
	{
	MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
	CPUMBState *env = &cpu->env;

	qemu_log_mask(CPU_LOG_INT, "Transaction failed: vaddr 0x%" VADDR_PRIx
	" physaddr 0x" TARGET_FMT_plx " size %d access type %s\n",
	addr, physaddr, size,
	access_type == MMU_INST_FETCH ? "INST_FETCH" :
	(access_type == MMU_DATA_LOAD ? "DATA_LOAD" : "DATA_STORE"));

	if (!(env->msr & MSR_EE)) {
	return;
	}

	if (access_type == MMU_INST_FETCH) {
	if (!cpu->cfg.iopb_bus_exception) {
	return;
	}
	env->esr = ESR_EC_INSN_BUS;
	} else {
	if (!cpu->cfg.dopb_bus_exception) {
	return;
	}
	env->esr = ESR_EC_DATA_BUS;
	}

	env->ear = addr;
	cs->exception_index = EXCP_HW_EXCP;
	cpu_loop_exit_restore(cs, retaddr);
	}
	#endif