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

 /*
  *  Microblaze helper routines.
  *
  *  Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>.
  *
  * 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 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 <assert.h>
 #include "cpu.h"
 #include "dyngen-exec.h"
 #include "helper.h"
 #include "host-utils.h"

 #define D(x)

 #if !defined(CONFIG_USER_ONLY)
 #include "softmmu_exec.h"

 #define MMUSUFFIX _mmu
 #define SHIFT 0
 #include "softmmu_template.h"
 #define SHIFT 1
 #include "softmmu_template.h"
 #define SHIFT 2
 #include "softmmu_template.h"
 #define SHIFT 3
 #include "softmmu_template.h"

 /* Try to fill the TLB and return an exception if error. If retaddr is
    NULL, it means that the function was called in C code (i.e. not
    from generated code or from helper.c) */
 /* XXX: fix it to restore all registers */
 void tlb_fill(CPUMBState *env1, target_ulong addr, int is_write, int mmu_idx,
               void *retaddr)
 {
     TranslationBlock *tb;
     CPUMBState *saved_env;
     unsigned long pc;
     int ret;

     saved_env = env;
     env = env1;

     ret = cpu_mb_handle_mmu_fault(env, addr, is_write, mmu_idx);
     if (unlikely(ret)) {
         if (retaddr) {
             /* now we have a real cpu fault */
             pc = (unsigned long)retaddr;
             tb = tb_find_pc(pc);
             if (tb) {
                 /* the PC is inside the translated code. It means that we have
                    a virtual CPU fault */
                 cpu_restore_state(tb, env, pc);
             }
         }
         cpu_loop_exit(env);
     }
     env = saved_env;
 }
 #endif

 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("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("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(uint32_t index)
 {
     env->exception_index = index;
     cpu_loop_exit(env);
 }

 void helper_debug(void)
 {
     int i;

     qemu_log("PC=%8.8x\n", env->sregs[SR_PC]);
     qemu_log("rmsr=%x resr=%x rear=%x debug[%x] imm=%x iflags=%x\n",
              env->sregs[SR_MSR], env->sregs[SR_ESR], env->sregs[SR_EAR],
              env->debug, env->imm, env->iflags);
     qemu_log("btaken=%d btarget=%x mode=%s(saved=%s) eip=%d ie=%d\n",
              env->btaken, env->btarget,
              (env->sregs[SR_MSR] & MSR_UM) ? "user" : "kernel",
              (env->sregs[SR_MSR] & MSR_UMS) ? "user" : "kernel",
              (env->sregs[SR_MSR] & MSR_EIP),
              (env->sregs[SR_MSR] & MSR_IE));
     for (i = 0; i < 32; i++) {
         qemu_log("r%2.2d=%8.8x ", i, env->regs[i]);
         if ((i + 1) % 4 == 0)
             qemu_log("\n");
     }
     qemu_log("\n\n");
 }

 static inline uint32_t compute_carry(uint32_t a, uint32_t b, uint32_t cin)
 {
     uint32_t cout = 0;

     if ((b == ~0) && cin)
         cout = 1;
     else if ((~0 - a) < (b + cin))
         cout = 1;
     return cout;
 }

 uint32_t helper_cmp(uint32_t a, uint32_t b)
 {
     uint32_t t;

     t = b + ~a + 1;
     if ((b & 0x80000000) ^ (a & 0x80000000))
         t = (t & 0x7fffffff) | (b & 0x80000000);
     return t;
 }

 uint32_t helper_cmpu(uint32_t a, uint32_t b)
 {
     uint32_t t;

     t = b + ~a + 1;
     if ((b & 0x80000000) ^ (a & 0x80000000))
         t = (t & 0x7fffffff) | (a & 0x80000000);
     return t;
 }

 uint32_t helper_clz(uint32_t t0)
 {
     return clz32(t0);
 }

 uint32_t helper_carry(uint32_t a, uint32_t b, uint32_t cf)
 {
     uint32_t ncf;
     ncf = compute_carry(a, b, cf);
     return ncf;
 }

 static inline int div_prepare(uint32_t a, uint32_t b)
 {
     if (b == 0) {
         env->sregs[SR_MSR] |= MSR_DZ;

         if ((env->sregs[SR_MSR] & MSR_EE)
             && !(env->pvr.regs[2] & PVR2_DIV_ZERO_EXC_MASK)) {
             env->sregs[SR_ESR] = ESR_EC_DIVZERO;
             helper_raise_exception(EXCP_HW_EXCP);
         }
         return 0;
     }
     env->sregs[SR_MSR] &= ~MSR_DZ;
     return 1;
 }

 uint32_t helper_divs(uint32_t a, uint32_t b)
 {
     if (!div_prepare(a, b))
         return 0;
     return (int32_t)a / (int32_t)b;
 }

 uint32_t helper_divu(uint32_t a, uint32_t b)
 {
     if (!div_prepare(a, b))
         return 0;
     return a / b;
 }

 /* raise FPU exception.  */
 static void raise_fpu_exception(void)
 {
     env->sregs[SR_ESR] = ESR_EC_FPU;
     helper_raise_exception(EXCP_HW_EXCP);
 }

 static void update_fpu_flags(int flags)
 {
     int raise = 0;

     if (flags & float_flag_invalid) {
         env->sregs[SR_FSR] |= FSR_IO;
         raise = 1;
     }
     if (flags & float_flag_divbyzero) {
         env->sregs[SR_FSR] |= FSR_DZ;
         raise = 1;
     }
     if (flags & float_flag_overflow) {
         env->sregs[SR_FSR] |= FSR_OF;
         raise = 1;
     }
     if (flags & float_flag_underflow) {
         env->sregs[SR_FSR] |= FSR_UF;
         raise = 1;
     }
     if (raise
         && (env->pvr.regs[2] & PVR2_FPU_EXC_MASK)
         && (env->sregs[SR_MSR] & MSR_EE)) {
         raise_fpu_exception();
     }
 }

 uint32_t helper_fadd(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(flags);
     return fd.l;
 }

 uint32_t helper_frsub(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(flags);
     return fd.l;
 }

 uint32_t helper_fmul(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(flags);

     return fd.l;
 }

 uint32_t helper_fdiv(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(flags);

     return fd.l;
 }

 uint32_t helper_fcmp_un(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) || float32_is_signaling_nan(fb.f)) {
         update_fpu_flags(float_flag_invalid);
         r = 1;
     }

     if (float32_is_quiet_nan(fa.f) || float32_is_quiet_nan(fb.f)) {
         r = 1;
     }

     return r;
 }

 uint32_t helper_fcmp_lt(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(flags & float_flag_invalid);

     return r;
 }

 uint32_t helper_fcmp_eq(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(flags & float_flag_invalid);

     return r;
 }

 uint32_t helper_fcmp_le(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(flags & float_flag_invalid);


     return r;
 }

 uint32_t helper_fcmp_gt(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(flags & float_flag_invalid);
     return r;
 }

 uint32_t helper_fcmp_ne(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(flags & float_flag_invalid);

     return r;
 }

 uint32_t helper_fcmp_ge(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(flags & float_flag_invalid);

     return r;
 }

 uint32_t helper_flt(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(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(flags);

     return r;
 }

 uint32_t helper_fsqrt(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(flags);

     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_memalign(uint32_t addr, uint32_t dr, uint32_t wr, uint32_t mask)
 {
     if (addr & mask) {
             qemu_log_mask(CPU_LOG_INT,
                           "unaligned access addr=%x mask=%x, wr=%d dr=r%d\n",
                           addr, mask, wr, dr);
             env->sregs[SR_EAR] = addr;
             env->sregs[SR_ESR] = ESR_EC_UNALIGNED_DATA | (wr << 10) \
                                  | (dr & 31) << 5;
             if (mask == 3) {
                 env->sregs[SR_ESR] |= 1 << 11;
             }
             if (!(env->sregs[SR_MSR] & MSR_EE)) {
                 return;
             }
             helper_raise_exception(EXCP_HW_EXCP);
     }
 }

 void helper_stackprot(uint32_t addr)
 {
     if (addr < env->slr || addr > env->shr) {
             qemu_log("Stack protector violation at %x %x %x\n",
                      addr, env->slr, env->shr);
             env->sregs[SR_EAR] = addr;
             env->sregs[SR_ESR] = ESR_EC_STACKPROT;
             helper_raise_exception(EXCP_HW_EXCP);
     }
 }

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

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

 void cpu_unassigned_access(CPUMBState *env1, target_phys_addr_t addr,
                            int is_write, int is_exec, int is_asi, int size)
 {
     CPUMBState *saved_env;

     saved_env = env;
     env = env1;

     qemu_log_mask(CPU_LOG_INT, "Unassigned " TARGET_FMT_plx " wr=%d exe=%d\n",
              addr, is_write, is_exec);
     if (!(env->sregs[SR_MSR] & MSR_EE)) {
         env = saved_env;
         return;
     }

     env->sregs[SR_EAR] = addr;
     if (is_exec) {
         if ((env->pvr.regs[2] & PVR2_IOPB_BUS_EXC_MASK)) {
             env->sregs[SR_ESR] = ESR_EC_INSN_BUS;
             helper_raise_exception(EXCP_HW_EXCP);
         }
     } else {
         if ((env->pvr.regs[2] & PVR2_DOPB_BUS_EXC_MASK)) {
             env->sregs[SR_ESR] = ESR_EC_DATA_BUS;
             helper_raise_exception(EXCP_HW_EXCP);
         }
     }
     env = saved_env;
 }
 #endif
	/*
	* Microblaze helper routines.
	*
	* Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>.
	*
	* 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 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 <assert.h>
	#include "cpu.h"
	#include "dyngen-exec.h"
	#include "helper.h"
	#include "host-utils.h"

	#define D(x)

	#if !defined(CONFIG_USER_ONLY)
	#include "softmmu_exec.h"

	#define MMUSUFFIX _mmu
	#define SHIFT 0
	#include "softmmu_template.h"
	#define SHIFT 1
	#include "softmmu_template.h"
	#define SHIFT 2
	#include "softmmu_template.h"
	#define SHIFT 3
	#include "softmmu_template.h"

	/* Try to fill the TLB and return an exception if error. If retaddr is
	NULL, it means that the function was called in C code (i.e. not
	from generated code or from helper.c) */
	/* XXX: fix it to restore all registers */
	void tlb_fill(CPUMBState *env1, target_ulong addr, int is_write, int mmu_idx,
	void *retaddr)
	{
	TranslationBlock *tb;
	CPUMBState *saved_env;
	unsigned long pc;
	int ret;

	saved_env = env;
	env = env1;

	ret = cpu_mb_handle_mmu_fault(env, addr, is_write, mmu_idx);
	if (unlikely(ret)) {
	if (retaddr) {
	/* now we have a real cpu fault */
	pc = (unsigned long)retaddr;
	tb = tb_find_pc(pc);
	if (tb) {
	/* the PC is inside the translated code. It means that we have
	a virtual CPU fault */
	cpu_restore_state(tb, env, pc);
	}
	}
	cpu_loop_exit(env);
	}
	env = saved_env;
	}
	#endif

	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("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("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(uint32_t index)
	{
	env->exception_index = index;
	cpu_loop_exit(env);
	}

	void helper_debug(void)
	{
	int i;

	qemu_log("PC=%8.8x\n", env->sregs[SR_PC]);
	qemu_log("rmsr=%x resr=%x rear=%x debug[%x] imm=%x iflags=%x\n",
	env->sregs[SR_MSR], env->sregs[SR_ESR], env->sregs[SR_EAR],
	env->debug, env->imm, env->iflags);
	qemu_log("btaken=%d btarget=%x mode=%s(saved=%s) eip=%d ie=%d\n",
	env->btaken, env->btarget,
	(env->sregs[SR_MSR] & MSR_UM) ? "user" : "kernel",
	(env->sregs[SR_MSR] & MSR_UMS) ? "user" : "kernel",
	(env->sregs[SR_MSR] & MSR_EIP),
	(env->sregs[SR_MSR] & MSR_IE));
	for (i = 0; i < 32; i++) {
	qemu_log("r%2.2d=%8.8x ", i, env->regs[i]);
	if ((i + 1) % 4 == 0)
	qemu_log("\n");
	}
	qemu_log("\n\n");
	}

	static inline uint32_t compute_carry(uint32_t a, uint32_t b, uint32_t cin)
	{
	uint32_t cout = 0;

	if ((b == ~0) && cin)
	cout = 1;
	else if ((~0 - a) < (b + cin))
	cout = 1;
	return cout;
	}

	uint32_t helper_cmp(uint32_t a, uint32_t b)
	{
	uint32_t t;

	t = b + ~a + 1;
	if ((b & 0x80000000) ^ (a & 0x80000000))
	t = (t & 0x7fffffff) \| (b & 0x80000000);
	return t;
	}

	uint32_t helper_cmpu(uint32_t a, uint32_t b)
	{
	uint32_t t;

	t = b + ~a + 1;
	if ((b & 0x80000000) ^ (a & 0x80000000))
	t = (t & 0x7fffffff) \| (a & 0x80000000);
	return t;
	}

	uint32_t helper_clz(uint32_t t0)
	{
	return clz32(t0);
	}

	uint32_t helper_carry(uint32_t a, uint32_t b, uint32_t cf)
	{
	uint32_t ncf;
	ncf = compute_carry(a, b, cf);
	return ncf;
	}

	static inline int div_prepare(uint32_t a, uint32_t b)
	{
	if (b == 0) {
	env->sregs[SR_MSR] \|= MSR_DZ;

	if ((env->sregs[SR_MSR] & MSR_EE)
	&& !(env->pvr.regs[2] & PVR2_DIV_ZERO_EXC_MASK)) {
	env->sregs[SR_ESR] = ESR_EC_DIVZERO;
	helper_raise_exception(EXCP_HW_EXCP);
	}
	return 0;
	}
	env->sregs[SR_MSR] &= ~MSR_DZ;
	return 1;
	}

	uint32_t helper_divs(uint32_t a, uint32_t b)
	{
	if (!div_prepare(a, b))
	return 0;
	return (int32_t)a / (int32_t)b;
	}

	uint32_t helper_divu(uint32_t a, uint32_t b)
	{
	if (!div_prepare(a, b))
	return 0;
	return a / b;
	}

	/* raise FPU exception. */
	static void raise_fpu_exception(void)
	{
	env->sregs[SR_ESR] = ESR_EC_FPU;
	helper_raise_exception(EXCP_HW_EXCP);
	}

	static void update_fpu_flags(int flags)
	{
	int raise = 0;

	if (flags & float_flag_invalid) {
	env->sregs[SR_FSR] \|= FSR_IO;
	raise = 1;
	}
	if (flags & float_flag_divbyzero) {
	env->sregs[SR_FSR] \|= FSR_DZ;
	raise = 1;
	}
	if (flags & float_flag_overflow) {
	env->sregs[SR_FSR] \|= FSR_OF;
	raise = 1;
	}
	if (flags & float_flag_underflow) {
	env->sregs[SR_FSR] \|= FSR_UF;
	raise = 1;
	}
	if (raise
	&& (env->pvr.regs[2] & PVR2_FPU_EXC_MASK)
	&& (env->sregs[SR_MSR] & MSR_EE)) {
	raise_fpu_exception();
	}
	}

	uint32_t helper_fadd(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(flags);
	return fd.l;
	}

	uint32_t helper_frsub(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(flags);
	return fd.l;
	}

	uint32_t helper_fmul(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(flags);

	return fd.l;
	}

	uint32_t helper_fdiv(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(flags);

	return fd.l;
	}

	uint32_t helper_fcmp_un(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) \|\| float32_is_signaling_nan(fb.f)) {
	update_fpu_flags(float_flag_invalid);
	r = 1;
	}

	if (float32_is_quiet_nan(fa.f) \|\| float32_is_quiet_nan(fb.f)) {
	r = 1;
	}

	return r;
	}

	uint32_t helper_fcmp_lt(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(flags & float_flag_invalid);

	return r;
	}

	uint32_t helper_fcmp_eq(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(flags & float_flag_invalid);

	return r;
	}

	uint32_t helper_fcmp_le(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(flags & float_flag_invalid);


	return r;
	}

	uint32_t helper_fcmp_gt(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(flags & float_flag_invalid);
	return r;
	}

	uint32_t helper_fcmp_ne(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(flags & float_flag_invalid);

	return r;
	}

	uint32_t helper_fcmp_ge(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(flags & float_flag_invalid);

	return r;
	}

	uint32_t helper_flt(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(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(flags);

	return r;
	}

	uint32_t helper_fsqrt(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(flags);

	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_memalign(uint32_t addr, uint32_t dr, uint32_t wr, uint32_t mask)
	{
	if (addr & mask) {
	qemu_log_mask(CPU_LOG_INT,
	"unaligned access addr=%x mask=%x, wr=%d dr=r%d\n",
	addr, mask, wr, dr);
	env->sregs[SR_EAR] = addr;
	env->sregs[SR_ESR] = ESR_EC_UNALIGNED_DATA \| (wr << 10) \
	\| (dr & 31) << 5;
	if (mask == 3) {
	env->sregs[SR_ESR] \|= 1 << 11;
	}
	if (!(env->sregs[SR_MSR] & MSR_EE)) {
	return;
	}
	helper_raise_exception(EXCP_HW_EXCP);
	}
	}

	void helper_stackprot(uint32_t addr)
	{
	if (addr < env->slr \|\| addr > env->shr) {
	qemu_log("Stack protector violation at %x %x %x\n",
	addr, env->slr, env->shr);
	env->sregs[SR_EAR] = addr;
	env->sregs[SR_ESR] = ESR_EC_STACKPROT;
	helper_raise_exception(EXCP_HW_EXCP);
	}
	}

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

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

	void cpu_unassigned_access(CPUMBState *env1, target_phys_addr_t addr,
	int is_write, int is_exec, int is_asi, int size)
	{
	CPUMBState *saved_env;

	saved_env = env;
	env = env1;

	qemu_log_mask(CPU_LOG_INT, "Unassigned " TARGET_FMT_plx " wr=%d exe=%d\n",
	addr, is_write, is_exec);
	if (!(env->sregs[SR_MSR] & MSR_EE)) {
	env = saved_env;
	return;
	}

	env->sregs[SR_EAR] = addr;
	if (is_exec) {
	if ((env->pvr.regs[2] & PVR2_IOPB_BUS_EXC_MASK)) {
	env->sregs[SR_ESR] = ESR_EC_INSN_BUS;
	helper_raise_exception(EXCP_HW_EXCP);
	}
	} else {
	if ((env->pvr.regs[2] & PVR2_DOPB_BUS_EXC_MASK)) {
	env->sregs[SR_ESR] = ESR_EC_DATA_BUS;
	helper_raise_exception(EXCP_HW_EXCP);
	}
	}
	env = saved_env;
	}
	#endif