target-ppc/helper.c - third_party/qemu - Git at Google

 /*
  *  PPC emulation helpers for qemu.
  *
  *  Copyright (c) 2003 Jocelyn Mayer
  *
  * 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, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 #include "exec.h"

 extern FILE *logfile;

 void cpu_loop_exit(void)
 {
     longjmp(env->jmp_env, 1);
 }

 /* shortcuts to generate exceptions */
 void raise_exception_err (int exception_index, int error_code)
 {
     env->exception_index = exception_index;
     env->error_code = error_code;

     cpu_loop_exit();
 }

 void raise_exception (int exception_index)
 {
     env->exception_index = exception_index;
     env->error_code = 0;

     cpu_loop_exit();
 }

 /* Helpers for "fat" micro operations */
 uint32_t do_load_cr (void)
 {
     return (env->crf[0] << 28) |
         (env->crf[1] << 24) |
         (env->crf[2] << 20) |
         (env->crf[3] << 16) |
         (env->crf[4] << 12) |
         (env->crf[5] << 8) |
         (env->crf[6] << 4) |
         (env->crf[7] << 0);
 }

 void do_store_cr (uint32_t crn, uint32_t value)
 {
     int i, sh;

     for (i = 0, sh = 7; i < 8; i++, sh --) {
         if (crn & (1 << sh))
             env->crf[i] = (value >> (sh * 4)) & 0xF;
     }
 }

 uint32_t do_load_xer (void)
 {
     return (xer_so << XER_SO) |
         (xer_ov << XER_OV) |
         (xer_ca << XER_CA) |
         (xer_bc << XER_BC);
 }

 void do_store_xer (uint32_t value)
 {
     xer_so = (value >> XER_SO) & 0x01;
     xer_ov = (value >> XER_OV) & 0x01;
     xer_ca = (value >> XER_CA) & 0x01;
     xer_bc = (value >> XER_BC) & 0x1f;
 }

 uint32_t do_load_msr (void)
 {
     return (msr_pow << MSR_POW) |
         (msr_ile << MSR_ILE) |
         (msr_ee << MSR_EE) |
         (msr_pr << MSR_PR) |
         (msr_fp << MSR_FP) |
         (msr_me << MSR_ME) |
         (msr_fe0 << MSR_FE0) |
         (msr_se << MSR_SE) |
         (msr_be << MSR_BE) |
         (msr_fe1 << MSR_FE1) |
         (msr_ip << MSR_IP) |
         (msr_ir << MSR_IR) |
         (msr_dr << MSR_DR) |
         (msr_ri << MSR_RI) |
         (msr_le << MSR_LE);
 }

 void do_store_msr (uint32_t msr_value)
 {
     msr_pow = (msr_value >> MSR_POW) & 0x03;
     msr_ile = (msr_value >> MSR_ILE) & 0x01;
     msr_ee = (msr_value >> MSR_EE) & 0x01;
     msr_pr = (msr_value >> MSR_PR) & 0x01;
     msr_fp = (msr_value >> MSR_FP) & 0x01;
     msr_me = (msr_value >> MSR_ME) & 0x01;
     msr_fe0 = (msr_value >> MSR_FE0) & 0x01;
     msr_se = (msr_value >> MSR_SE) & 0x01;
     msr_be = (msr_value >> MSR_BE) & 0x01;
     msr_fe1 = (msr_value >> MSR_FE1) & 0x01;
     msr_ip = (msr_value >> MSR_IP) & 0x01;
     msr_ir = (msr_value >> MSR_IR) & 0x01;
     msr_dr = (msr_value >> MSR_DR) & 0x01;
     msr_ri = (msr_value >> MSR_RI) & 0x01;
     msr_le = (msr_value >> MSR_LE) & 0x01;
 }

 /* The 32 MSB of the target fpr are undefined. They'll be zero... */
 /* Floating point operations helpers */
 void do_load_fpscr (void)
 {
     /* The 32 MSB of the target fpr are undefined.
      * They'll be zero...
      */
     union {
         double d;
         struct {
             uint32_t u[2];
         } s;
     } u;
     int i;

     u.s.u[0] = 0;
     u.s.u[1] = 0;
     for (i = 0; i < 8; i++)
         u.s.u[1] |= env->fpscr[i] << (4 * i);
     FT0 = u.d;
 }

 void do_store_fpscr (uint32_t mask)
 {
     /*
      * We use only the 32 LSB of the incoming fpr
      */
     union {
         double d;
         struct {
             uint32_t u[2];
         } s;
     } u;
     int i;

     u.d = FT0;
     if (mask & 0x80)
         env->fpscr[0] = (env->fpscr[0] & 0x9) | ((u.s.u[1] >> 28) & ~0x9);
     for (i = 1; i < 7; i++) {
         if (mask & (1 << (7 - i)))
             env->fpscr[i] = (u.s.u[1] >> (4 * (7 - i))) & 0xF;
     }
     /* TODO: update FEX & VX */
     /* Set rounding mode */
     switch (env->fpscr[0] & 0x3) {
     case 0:
         /* Best approximation (round to nearest) */
         fesetround(FE_TONEAREST);
         break;
     case 1:
         /* Smaller magnitude (round toward zero) */
         fesetround(FE_TOWARDZERO);
         break;
     case 2:
         /* Round toward +infinite */
         fesetround(FE_UPWARD);
         break;
     case 3:
         /* Round toward -infinite */
         fesetround(FE_DOWNWARD);
         break;
     }
 }

 int32_t do_sraw(int32_t value, uint32_t shift)
 {
     int32_t ret;

     xer_ca = 0;
     if (shift & 0x20) {
         ret = (-1) * ((uint32_t)value >> 31);
         if (ret < 0)
             xer_ca = 1;
     } else {
         ret = value >> (shift & 0x1f);
         if (ret < 0 && (value & ((1 << shift) - 1)) != 0)
             xer_ca = 1;
     }

     return ret;
 }

 void do_lmw (int reg, uint32_t src)
 {
     for (; reg <= 31; reg++, src += 4)
         ugpr(reg) = ld32(src);
 }

 void do_stmw (int reg, uint32_t dest)
 {
     for (; reg <= 31; reg++, dest += 4)
         st32(dest, ugpr(reg));
 }

 void do_lsw (uint32_t reg, int count, uint32_t src)
 {
     uint32_t tmp;
     int sh;

     for (; count > 3; count -= 4, src += 4) {
         ugpr(reg++) = ld32(src);
         if (T2 == 32)
             T2 = 0;
     }
     if (count > 0) {
                 tmp = 0;
         for (sh = 24; count > 0; count--, src++, sh -= 8) {
             tmp |= ld8(src) << sh;
         }
         ugpr(reg) = tmp;
     }
 }

 void do_stsw (uint32_t reg, int count, uint32_t dest)
 {
     int sh;

     for (; count > 3; count -= 4, dest += 4) {
         st32(dest, ugpr(reg++));
         if (reg == 32)
             reg = 0;
     }
     if (count > 0) {
         for (sh = 24; count > 0; count--, dest++, sh -= 8) {
             st8(dest, (ugpr(reg) >> sh) & 0xFF);
             }
         }
 }

 void do_dcbz (void)
 {
     int i;

     /* Assume cache line size is 32 */
     for (i = 0; i < 8; i++) {
         st32(T0, 0);
         T0 += 4;
     }
 }

 /* Instruction cache invalidation helper */
 void do_icbi (void)
 {
     tb_invalidate_page(T0);
 }
	/*
	* PPC emulation helpers for qemu.
	*
	* Copyright (c) 2003 Jocelyn Mayer
	*
	* 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, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/
	#include "exec.h"

	extern FILE *logfile;

	void cpu_loop_exit(void)
	{
	longjmp(env->jmp_env, 1);
	}

	/* shortcuts to generate exceptions */
	void raise_exception_err (int exception_index, int error_code)
	{
	env->exception_index = exception_index;
	env->error_code = error_code;

	cpu_loop_exit();
	}

	void raise_exception (int exception_index)
	{
	env->exception_index = exception_index;
	env->error_code = 0;

	cpu_loop_exit();
	}

	/* Helpers for "fat" micro operations */
	uint32_t do_load_cr (void)
	{
	return (env->crf[0] << 28) \|
	(env->crf[1] << 24) \|
	(env->crf[2] << 20) \|
	(env->crf[3] << 16) \|
	(env->crf[4] << 12) \|
	(env->crf[5] << 8) \|
	(env->crf[6] << 4) \|
	(env->crf[7] << 0);
	}

	void do_store_cr (uint32_t crn, uint32_t value)
	{
	int i, sh;

	for (i = 0, sh = 7; i < 8; i++, sh --) {
	if (crn & (1 << sh))
	env->crf[i] = (value >> (sh * 4)) & 0xF;
	}
	}

	uint32_t do_load_xer (void)
	{
	return (xer_so << XER_SO) \|
	(xer_ov << XER_OV) \|
	(xer_ca << XER_CA) \|
	(xer_bc << XER_BC);
	}

	void do_store_xer (uint32_t value)
	{
	xer_so = (value >> XER_SO) & 0x01;
	xer_ov = (value >> XER_OV) & 0x01;
	xer_ca = (value >> XER_CA) & 0x01;
	xer_bc = (value >> XER_BC) & 0x1f;
	}

	uint32_t do_load_msr (void)
	{
	return (msr_pow << MSR_POW) \|
	(msr_ile << MSR_ILE) \|
	(msr_ee << MSR_EE) \|
	(msr_pr << MSR_PR) \|
	(msr_fp << MSR_FP) \|
	(msr_me << MSR_ME) \|
	(msr_fe0 << MSR_FE0) \|
	(msr_se << MSR_SE) \|
	(msr_be << MSR_BE) \|
	(msr_fe1 << MSR_FE1) \|
	(msr_ip << MSR_IP) \|
	(msr_ir << MSR_IR) \|
	(msr_dr << MSR_DR) \|
	(msr_ri << MSR_RI) \|
	(msr_le << MSR_LE);
	}

	void do_store_msr (uint32_t msr_value)
	{
	msr_pow = (msr_value >> MSR_POW) & 0x03;
	msr_ile = (msr_value >> MSR_ILE) & 0x01;
	msr_ee = (msr_value >> MSR_EE) & 0x01;
	msr_pr = (msr_value >> MSR_PR) & 0x01;
	msr_fp = (msr_value >> MSR_FP) & 0x01;
	msr_me = (msr_value >> MSR_ME) & 0x01;
	msr_fe0 = (msr_value >> MSR_FE0) & 0x01;
	msr_se = (msr_value >> MSR_SE) & 0x01;
	msr_be = (msr_value >> MSR_BE) & 0x01;
	msr_fe1 = (msr_value >> MSR_FE1) & 0x01;
	msr_ip = (msr_value >> MSR_IP) & 0x01;
	msr_ir = (msr_value >> MSR_IR) & 0x01;
	msr_dr = (msr_value >> MSR_DR) & 0x01;
	msr_ri = (msr_value >> MSR_RI) & 0x01;
	msr_le = (msr_value >> MSR_LE) & 0x01;
	}

	/* The 32 MSB of the target fpr are undefined. They'll be zero... */
	/* Floating point operations helpers */
	void do_load_fpscr (void)
	{
	/* The 32 MSB of the target fpr are undefined.
	* They'll be zero...
	*/
	union {
	double d;
	struct {
	uint32_t u[2];
	} s;
	} u;
	int i;

	u.s.u[0] = 0;
	u.s.u[1] = 0;
	for (i = 0; i < 8; i++)
	u.s.u[1] \|= env->fpscr[i] << (4 * i);
	FT0 = u.d;
	}

	void do_store_fpscr (uint32_t mask)
	{
	/*
	* We use only the 32 LSB of the incoming fpr
	*/
	union {
	double d;
	struct {
	uint32_t u[2];
	} s;
	} u;
	int i;

	u.d = FT0;
	if (mask & 0x80)
	env->fpscr[0] = (env->fpscr[0] & 0x9) \| ((u.s.u[1] >> 28) & ~0x9);
	for (i = 1; i < 7; i++) {
	if (mask & (1 << (7 - i)))
	env->fpscr[i] = (u.s.u[1] >> (4 * (7 - i))) & 0xF;
	}
	/* TODO: update FEX & VX */
	/* Set rounding mode */
	switch (env->fpscr[0] & 0x3) {
	case 0:
	/* Best approximation (round to nearest) */
	fesetround(FE_TONEAREST);
	break;
	case 1:
	/* Smaller magnitude (round toward zero) */
	fesetround(FE_TOWARDZERO);
	break;
	case 2:
	/* Round toward +infinite */
	fesetround(FE_UPWARD);
	break;
	case 3:
	/* Round toward -infinite */
	fesetround(FE_DOWNWARD);
	break;
	}
	}

	int32_t do_sraw(int32_t value, uint32_t shift)
	{
	int32_t ret;

	xer_ca = 0;
	if (shift & 0x20) {
	ret = (-1) * ((uint32_t)value >> 31);
	if (ret < 0)
	xer_ca = 1;
	} else {
	ret = value >> (shift & 0x1f);
	if (ret < 0 && (value & ((1 << shift) - 1)) != 0)
	xer_ca = 1;
	}

	return ret;
	}

	void do_lmw (int reg, uint32_t src)
	{
	for (; reg <= 31; reg++, src += 4)
	ugpr(reg) = ld32(src);
	}

	void do_stmw (int reg, uint32_t dest)
	{
	for (; reg <= 31; reg++, dest += 4)
	st32(dest, ugpr(reg));
	}

	void do_lsw (uint32_t reg, int count, uint32_t src)
	{
	uint32_t tmp;
	int sh;

	for (; count > 3; count -= 4, src += 4) {
	ugpr(reg++) = ld32(src);
	if (T2 == 32)
	T2 = 0;
	}
	if (count > 0) {
	tmp = 0;
	for (sh = 24; count > 0; count--, src++, sh -= 8) {
	tmp \|= ld8(src) << sh;
	}
	ugpr(reg) = tmp;
	}
	}

	void do_stsw (uint32_t reg, int count, uint32_t dest)
	{
	int sh;

	for (; count > 3; count -= 4, dest += 4) {
	st32(dest, ugpr(reg++));
	if (reg == 32)
	reg = 0;
	}
	if (count > 0) {
	for (sh = 24; count > 0; count--, dest++, sh -= 8) {
	st8(dest, (ugpr(reg) >> sh) & 0xFF);
	}
	}
	}

	void do_dcbz (void)
	{
	int i;

	/* Assume cache line size is 32 */
	for (i = 0; i < 8; i++) {
	st32(T0, 0);
	T0 += 4;
	}
	}

	/* Instruction cache invalidation helper */
	void do_icbi (void)
	{
	tb_invalidate_page(T0);
	}