helper.c
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/*
* 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... */
uint32_t do_load_fpscr (void)
{
return (fpscr_fx << FPSCR_FX) |
(fpscr_fex << FPSCR_FEX) |
(fpscr_vx << FPSCR_VX) |
(fpscr_ox << FPSCR_OX) |
(fpscr_ux << FPSCR_UX) |
(fpscr_zx << FPSCR_ZX) |
(fpscr_xx << FPSCR_XX) |
(fpscr_vsxnan << FPSCR_VXSNAN) |
(fpscr_vxisi << FPSCR_VXISI) |
(fpscr_vxidi << FPSCR_VXIDI) |
(fpscr_vxzdz << FPSCR_VXZDZ) |
(fpscr_vximz << FPSCR_VXIMZ) |
(fpscr_fr << FPSCR_FR) |
(fpscr_fi << FPSCR_FI) |
(fpscr_fprf << FPSCR_FPRF) |
(fpscr_vxsoft << FPSCR_VXSOFT) |
(fpscr_vxsqrt << FPSCR_VXSQRT) |
(fpscr_oe << FPSCR_OE) |
(fpscr_ue << FPSCR_UE) |
(fpscr_ze << FPSCR_ZE) |
(fpscr_xe << FPSCR_XE) |
(fpscr_ni << FPSCR_NI) |
(fpscr_rn << FPSCR_RN);
}
/* We keep only 32 bits of input... */
/* For now, this is COMPLETELY BUGGY ! */
void do_store_fpscr (uint8_t mask, uint32_t fp)
{
int i;
for (i = 0; i < 7; i++) {
if ((mask & (1 << i)) == 0)
fp &= ~(0xf << (4 * i));
}
if ((mask & 80) != 0)
fpscr_fx = (fp >> FPSCR_FX) & 0x01;
fpscr_fex = (fp >> FPSCR_FEX) & 0x01;
fpscr_vx = (fp >> FPSCR_VX) & 0x01;
fpscr_ox = (fp >> FPSCR_OX) & 0x01;
fpscr_ux = (fp >> FPSCR_UX) & 0x01;
fpscr_zx = (fp >> FPSCR_ZX) & 0x01;
fpscr_xx = (fp >> FPSCR_XX) & 0x01;
fpscr_vsxnan = (fp >> FPSCR_VXSNAN) & 0x01;
fpscr_vxisi = (fp >> FPSCR_VXISI) & 0x01;
fpscr_vxidi = (fp >> FPSCR_VXIDI) & 0x01;
fpscr_vxzdz = (fp >> FPSCR_VXZDZ) & 0x01;
fpscr_vximz = (fp >> FPSCR_VXIMZ) & 0x01;
fpscr_fr = (fp >> FPSCR_FR) & 0x01;
fpscr_fi = (fp >> FPSCR_FI) & 0x01;
fpscr_fprf = (fp >> FPSCR_FPRF) & 0x1F;
fpscr_vxsoft = (fp >> FPSCR_VXSOFT) & 0x01;
fpscr_vxsqrt = (fp >> FPSCR_VXSQRT) & 0x01;
fpscr_oe = (fp >> FPSCR_OE) & 0x01;
fpscr_ue = (fp >> FPSCR_UE) & 0x01;
fpscr_ze = (fp >> FPSCR_ZE) & 0x01;
fpscr_xe = (fp >> FPSCR_XE) & 0x01;
fpscr_ni = (fp >> FPSCR_NI) & 0x01;
fpscr_rn = (fp >> FPSCR_RN) & 0x03;
}
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) {
if (reg == 32)
reg = 0;
ugpr(reg++) = ld32(src);
}
if (count > 0) {
for (sh = 24, tmp = 0; count > 0; count--, src++, sh -= 8) {
if (reg == 32)
reg = 0;
tmp |= ld8(src) << sh;
if (sh == 0) {
sh = 32;
ugpr(reg++) = tmp;
tmp = 0;
}
}
ugpr(reg) = tmp;
}
}
void do_stsw (uint32_t reg, int count, uint32_t dest)
{
int sh;
for (; count > 3; count -= 4, dest += 4) {
if (reg == 32)
reg = 0;
st32(dest, ugpr(reg++));
}
if (count > 0) {
for (sh = 24; count > 0; count--, dest++, sh -= 8) {
if (reg == 32)
reg = 0;
st8(dest, (ugpr(reg) >> sh) & 0xFF);
if (sh == 0) {
sh = 32;
reg++;
}
}
}
}