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/*
* Copyright (c) 2002,2003 Hewlett-Packard Company
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "uwx_env.h"
#include "uwx_context.h"
#include "uwx_scoreboard.h"
#include "uwx_trace.h"
int uwx_init_context(
struct uwx_env *env,
uint64_t ip,
uint64_t sp,
uint64_t bsp,
uint64_t cfm)
{
int i;
if (env == 0)
return UWX_ERR_NOENV;
env->context.special[UWX_REG_IP] = ip;
env->context.special[UWX_REG_SP] = sp;
env->context.special[UWX_REG_BSP] = bsp;
env->context.special[UWX_REG_CFM] = cfm;
for (i = UWX_REG_RP; i < NSPECIALREG; i++)
env->context.special[i] = 0;
for (i = 0; i < NPRESERVEDGR; i++)
env->context.gr[i] = 0;
env->context.valid_regs = VALID_BASIC4;
env->rstate = 0;
(void)uwx_init_history(env);
return UWX_OK;
}
int uwx_get_reg(struct uwx_env *env, int regid, uint64_t *valp)
{
int status;
int sor;
int rrb_gr;
uint64_t bsp;
int n;
if (env == 0)
return UWX_ERR_NOENV;
status = UWX_OK;
if (regid < NSPECIALREG && (env->context.valid_regs & (1 << regid)))
*valp = env->context.special[regid];
else if (regid >= UWX_REG_GR(4) && regid <= UWX_REG_GR(7) &&
(env->context.valid_regs &
(1 << (regid - UWX_REG_GR(4) + VALID_GR_SHIFT))) )
*valp = env->context.gr[regid - UWX_REG_GR(4)];
else if (regid >= UWX_REG_GR(32) && regid <= UWX_REG_GR(127)) {
if (env->copyin == 0)
return UWX_ERR_NOCALLBACKS;
bsp = env->context.special[UWX_REG_BSP];
TRACE_C_GET_REG(regid, bsp)
regid -= UWX_REG_GR(32);
sor = (((int) env->context.special[UWX_REG_CFM] >> 14) & 0x0f) * 8;
rrb_gr = ((int) env->context.special[UWX_REG_CFM] >> 18) & 0x7f;
if (sor != 0 && rrb_gr != 0 && regid < sor) {
TRACE_C_ROTATE_GR(regid, sor, rrb_gr, (regid+rrb_gr)%sor)
regid = (regid + rrb_gr) % sor;
}
bsp = uwx_add_to_bsp(bsp, regid);
n = (*env->copyin)(UWX_COPYIN_RSTACK, (char *)valp,
bsp, DWORDSZ, env->cb_token);
if (n != DWORDSZ)
status = UWX_ERR_COPYIN_RSTK;
}
else if (regid == UWX_REG_GR(0))
*valp = 0;
else if (regid >= UWX_REG_BR(1) && regid <= UWX_REG_BR(5) &&
(env->context.valid_regs &
(1 << (regid - UWX_REG_BR(1) + VALID_BR_SHIFT))) )
*valp = env->context.br[regid - UWX_REG_BR(1)];
else if (regid >= UWX_REG_FR(2) && regid <= UWX_REG_BR(5) &&
(env->context.valid_frs & (1 << (regid - UWX_REG_FR(2)))) ) {
valp[0] = env->context.fr[regid - UWX_REG_FR(2)].part0;
valp[1] = env->context.fr[regid - UWX_REG_FR(2)].part1;
}
else if (regid >= UWX_REG_FR(16) && regid <= UWX_REG_BR(31) &&
(env->context.valid_frs & (1 << (regid - UWX_REG_FR(2)))) ) {
valp[0] = env->context.fr[regid - UWX_REG_FR(16) + 4].part0;
valp[1] = env->context.fr[regid - UWX_REG_FR(16) + 4].part1;
}
else if ( (regid < NSPECIALREG) ||
(regid >= UWX_REG_GR(1) && regid <= UWX_REG_GR(31)) ||
(regid >= UWX_REG_BR(0) && regid <= UWX_REG_BR(7)) ) {
if (env->copyin == 0)
return UWX_ERR_NOCALLBACKS;
n = (*env->copyin)(UWX_COPYIN_REG, (char *)valp,
regid, DWORDSZ, env->cb_token);
if (n != DWORDSZ)
status = UWX_ERR_COPYIN_REG;
}
else if (regid >= UWX_REG_FR(2) && regid <= UWX_REG_BR(127)) {
if (env->copyin == 0)
return UWX_ERR_NOCALLBACKS;
n = (*env->copyin)(UWX_COPYIN_REG, (char *)valp,
regid, 2*DWORDSZ, env->cb_token);
if (n != 2*DWORDSZ)
status = UWX_ERR_COPYIN_REG;
}
else if (regid == UWX_REG_FR(0)) {
valp[0] = 0;
valp[1] = 0;
}
else if (regid == UWX_REG_FR(1)) {
valp[0] = 0x000000000000ffffULL;
valp[1] = 0x8000000000000000ULL;
}
else
status = UWX_ERR_BADREGID;
return status;
}
int uwx_get_nat(struct uwx_env *env, int regid, int *natp)
{
int status;
int sor;
int rrb_gr;
uint64_t bsp;
uint64_t natcollp;
uint64_t natcoll;
int n;
if (env == 0)
return UWX_ERR_NOENV;
status = UWX_OK;
if (regid >= UWX_REG_GR(4) && regid <= UWX_REG_GR(7) &&
(env->context.valid_regs &
(1 << (regid - UWX_REG_GR(4) + VALID_GR_SHIFT))) ) {
*natp = (env->context.special[UWX_REG_PRIUNAT] >>
(regid - UWX_REG_GR(4)) ) & 0x01;
}
else if (regid >= UWX_REG_GR(32) && regid <= UWX_REG_GR(127)) {
if (env->copyin == 0)
return UWX_ERR_NOCALLBACKS;
bsp = env->context.special[UWX_REG_BSP];
regid -= UWX_REG_GR(32);
sor = (((int) env->context.special[UWX_REG_CFM] >> 14) & 0x0f) * 8;
rrb_gr = ((int) env->context.special[UWX_REG_CFM] >> 18) & 0x7f;
if (sor != 0 && rrb_gr != 0 && regid < sor) {
regid = (regid + rrb_gr) % sor;
}
bsp = uwx_add_to_bsp(bsp, regid);
natcollp = bsp | 0x01f8;
if (natcollp >= bsp)
n = (*env->copyin)(UWX_COPYIN_REG, (char *)&natcoll,
(uint64_t)UWX_REG_RNAT, DWORDSZ, env->cb_token);
else
n = (*env->copyin)(UWX_COPYIN_RSTACK, (char *)&natcoll,
bsp, DWORDSZ, env->cb_token);
if (n != DWORDSZ)
return UWX_ERR_COPYIN_RSTK;
*natp = (int)(natcoll >> (((int)bsp >> 3) & 0x3f)) & 0x01;
}
else if (regid == UWX_REG_GR(0))
*natp = 0;
else
status = UWX_ERR_BADREGID;
return status;
}
int uwx_get_spill_loc(struct uwx_env *env, int regid, uint64_t *dispp)
{
int status;
int sor;
int rrb_gr;
uint64_t bsp;
if (env == 0)
return UWX_ERR_NOENV;
status = UWX_OK;
if (regid < NSPECIALREG)
*dispp = env->history.special[regid];
else if (regid >= UWX_REG_GR(4) && regid <= UWX_REG_GR(7))
*dispp = env->history.gr[regid - UWX_REG_GR(4)];
else if (regid >= UWX_REG_GR(32) && regid <= UWX_REG_GR(127)) {
bsp = env->context.special[UWX_REG_BSP];
regid -= UWX_REG_GR(32);
sor = (((int) env->context.special[UWX_REG_CFM] >> 14) & 0x0f) * 8;
rrb_gr = ((int) env->context.special[UWX_REG_CFM] >> 18) & 0x7f;
if (sor != 0 && rrb_gr != 0 && regid < sor)
regid = (regid + rrb_gr) % sor;
bsp = uwx_add_to_bsp(bsp, regid);
*dispp = UWX_DISP_RSTK(bsp);
}
else if (regid >= UWX_REG_BR(1) && regid <= UWX_REG_GR(5))
*dispp = env->history.br[regid - UWX_REG_BR(1)];
else if (regid >= UWX_REG_FR(2) && regid <= UWX_REG_FR(5))
*dispp = env->history.fr[regid - UWX_REG_FR(2)];
else if (regid >= UWX_REG_FR(16) && regid <= UWX_REG_FR(31))
*dispp = env->history.fr[regid - UWX_REG_FR(16) + 4];
else if ( (regid >= UWX_REG_GR(1) && regid <= UWX_REG_GR(31)) ||
(regid >= UWX_REG_BR(0) && regid <= UWX_REG_BR(7)) ||
(regid >= UWX_REG_FR(2) && regid <= UWX_REG_FR(127)) )
*dispp = UWX_DISP_REG(regid);
else
status = UWX_ERR_BADREGID;
return status;
}
int uwx_set_reg(struct uwx_env *env, int regid, uint64_t val)
{
int status;
if (env == 0)
return UWX_ERR_NOENV;
if (regid < NSPECIALREG) {
env->context.special[regid] = val;
env->context.valid_regs |= 1 << regid;
status = UWX_OK;
}
else if (regid >= UWX_REG_GR(4) && regid <= UWX_REG_GR(7)) {
env->context.gr[regid - UWX_REG_GR(4)] = val;
env->context.valid_regs |=
1 << (regid - UWX_REG_GR(4) + VALID_GR_SHIFT);
status = UWX_OK;
}
else if (regid >= UWX_REG_GR(32) && regid <= UWX_REG_GR(127)) {
status = UWX_ERR_BADREGID;
}
else if (regid >= UWX_REG_BR(1) && regid <= UWX_REG_BR(5)) {
env->context.br[regid - UWX_REG_BR(1)] = val;
env->context.valid_regs |=
1 << (regid - UWX_REG_BR(1) + VALID_BR_SHIFT);
status = UWX_OK;
}
else
status = UWX_ERR_BADREGID;
return status;
}
int uwx_set_fr(struct uwx_env *env, int regid, uint64_t *val)
{
if (regid >= UWX_REG_FR(2) && regid <= UWX_REG_FR(5))
regid -= UWX_REG_FR(2);
else if (regid >= UWX_REG_FR(16) && regid <= UWX_REG_FR(31))
regid -= UWX_REG_FR(16) - 4;
else
return UWX_ERR_BADREGID;
env->context.fr[regid].part0 = val[0];
env->context.fr[regid].part1 = val[1];
env->context.valid_frs |= 1 << regid;
env->nsbreg = NSBREG;
return UWX_OK;
}
uint64_t uwx_add_to_bsp(uint64_t bsp, int nslots)
{
int bias;
/*
* Here's a picture of the backing store as modeled in
* the computations below. "X" marks NaT collections at
* every 0x1f8 mod 0x200 address.
*
* To make the NaT adjustments easier, we bias the current bsp
* by enough slots to place it at the previous NaT collection.
* Then we need to add the bias to the number of slots,
* then add 1 for every 63 slots to account for NaT collections.
* Then we can remove the bias again and add the adjusted
* number of slots to the bsp.
*
* 0 1f8 3f8
* +---------------------------------------------------------------+
* | X X|
* +---------------------------------------------------------------+
* <-------- bias -------->
* <--- nslots --->
* ^
* |
* bsp
* <------- adjusted (nslots + bias) ------->
* When subtracting from bsp, we bias the bsp in the opposite
* direction so that it is at the next NaT collection.
*
* 0 1f8 3f8
* +---------------------------------------------------------------+
* | X X|
* +---------------------------------------------------------------+
* <------- bias ------->
* <--- nslots --->
* ^
* |
* bsp
* <------ adjusted (nslots + bias) ------>
*/
if (nslots > 0) {
bias = ((unsigned int)bsp & 0x1f8) / DWORDSZ;
nslots += (nslots + bias) / 63;
}
else if (nslots < 0) {
bias = (0x1f8 - ((unsigned int)bsp & 0x1f8)) / DWORDSZ;
nslots -= (-nslots + bias) / 63;
}
return bsp + nslots * DWORDSZ;
}
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