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windows-xp/Source/XPSP1/NT/sdktools/debuggers/ia64tools/decem/decoder.c

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/*
* Copyright (c) 2000, Intel Corporation
* All rights reserved.
*
* WARRANTY DISCLAIMER
*
* THESE MATERIALS ARE PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTEL OR ITS
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THESE
* MATERIALS, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Intel Corporation is the author of the Materials, and requests that all
* problem reports or change requests be submitted to it directly at
* http://developer.intel.com/opensource.
*/
#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include <string.h>
#include <assert.h>
#define INT64
#include "decfn_emdb.h"
#include "decision_tree.h"
#pragma function (memset)
#include "decoder_priv.h"
/***************************************************************************/
#define STATIC
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
#define PRED_SIZE EM_PREDICATE_BITS
#define INIT_PSEUDO_TROLES_TAB_ENTRY(Entry,Slot0,Slot1,Slot2) \
{ \
pseudo_troles_tab[Entry][0] = (Slot0); \
pseudo_troles_tab[Entry][1] = (Slot1); \
pseudo_troles_tab[Entry][2] = (Slot2); \
}
#define EM_DECODER_FLAGS__NO_MEMSET(Flags) ((Flags) & EM_DECODER_FLAG_NO_MEMSET)
/***************************************************************************/
U4byte IEL_t1, IEL_t2, IEL_t3, IEL_t4;
U32 IEL_tempc;
U64 IEL_et1, IEL_et2;
U128 IEL_ext1, IEL_ext2, IEL_ext3, IEL_ext4, IEL_ext5;
S128 IEL_ts1, IEL_ts2;
extern struct EM_version_s deccpu_emdb_version;
const U32 decoder_bundle_size = IEL_CONST32(EM_BUNDLE_SIZE);
STATIC Temp_role_t pseudo_troles_tab[16][3];
STATIC int troles_tab_initialized = FALSE;
STATIC EM_Decoder_Err em_decoding(const EM_Decoder_Id, const unsigned char *,
const int, const EM_IL, EM_Decoder_Info *);
STATIC EM_Decoder_Err em_inst_decode(const EM_Decoder_Id, U64, const Temp_role_t,
const U128 *, EM_Decoder_Info *);
STATIC void em_decoder_init_decoder_info(EM_Decoder_Info *decoder_info);
STATIC void em_decoder_init_bundle_info(EM_Decoder_Bundle_Info *bundle_info);
STATIC void init_pseudo_troles_tab(void);
/****************************************************************************
* init_pseudo_troles_tab *
* initalizes pseudo_troles_tab. If only template-# changes, update EM.h *
* is enough to update the decoder. *
****************************************************************************/
STATIC void init_pseudo_troles_tab(void)
{
/*** In the following table EM_TEMP_ROLE_MEM means M/A & same for _INT ***/
int i;
/*** initialize all entries as reserved ***/
for (i = 0; i < EM_NUM_OF_TEMPLATES; i++)
INIT_PSEUDO_TROLES_TAB_ENTRY(i, EM_TEMP_ROLE_NONE, EM_TEMP_ROLE_NONE,
EM_TEMP_ROLE_NONE);
/*** initialize specific entries ***/
INIT_PSEUDO_TROLES_TAB_ENTRY(EM_template_mii , EM_TEMP_ROLE_MEM , \
EM_TEMP_ROLE_INT , EM_TEMP_ROLE_INT );
INIT_PSEUDO_TROLES_TAB_ENTRY(EM_template_mi_i , EM_TEMP_ROLE_MEM , \
EM_TEMP_ROLE_INT , EM_TEMP_ROLE_INT );
INIT_PSEUDO_TROLES_TAB_ENTRY(EM_template_mlx , EM_TEMP_ROLE_MEM , \
EM_TEMP_ROLE_LONG, EM_TEMP_ROLE_LONG);
INIT_PSEUDO_TROLES_TAB_ENTRY(EM_template_mmi , EM_TEMP_ROLE_MEM , \
EM_TEMP_ROLE_MEM , EM_TEMP_ROLE_INT );
INIT_PSEUDO_TROLES_TAB_ENTRY(EM_template_m_mi , EM_TEMP_ROLE_MEM , \
EM_TEMP_ROLE_MEM , EM_TEMP_ROLE_INT );
INIT_PSEUDO_TROLES_TAB_ENTRY(EM_template_mfi , EM_TEMP_ROLE_MEM , \
EM_TEMP_ROLE_FP , EM_TEMP_ROLE_INT );
INIT_PSEUDO_TROLES_TAB_ENTRY(EM_template_mmf , EM_TEMP_ROLE_MEM , \
EM_TEMP_ROLE_MEM , EM_TEMP_ROLE_FP );
INIT_PSEUDO_TROLES_TAB_ENTRY(EM_template_mib , EM_TEMP_ROLE_MEM , \
EM_TEMP_ROLE_INT , EM_TEMP_ROLE_BR );
INIT_PSEUDO_TROLES_TAB_ENTRY(EM_template_mbb , EM_TEMP_ROLE_MEM , \
EM_TEMP_ROLE_BR , EM_TEMP_ROLE_BR );
INIT_PSEUDO_TROLES_TAB_ENTRY(EM_template_bbb , EM_TEMP_ROLE_BR , \
EM_TEMP_ROLE_BR , EM_TEMP_ROLE_BR );
INIT_PSEUDO_TROLES_TAB_ENTRY(EM_template_mmb , EM_TEMP_ROLE_MEM , \
EM_TEMP_ROLE_MEM , EM_TEMP_ROLE_BR );
INIT_PSEUDO_TROLES_TAB_ENTRY(EM_template_mfb , EM_TEMP_ROLE_MEM , \
EM_TEMP_ROLE_FP , EM_TEMP_ROLE_BR );
/*** avoid multpiple initializations ***/
troles_tab_initialized = TRUE;
};
#ifdef BIG_ENDIAN
#define ENTITY_SWAP(E) entity_swap((unsigned char *)(&(E)), sizeof(E))
/***************************** entity_swap *******************************/
/* swap any number of bytes */
/*************************************************************************/
STATIC void entity_swap(unsigned char *entity_1st, unsigned int size)
{
unsigned char tmp8, *p, *q;
for (q = (p = entity_1st) + (size-1);
p < q;
p++, q--)
{
tmp8 = *q;
*q = *p;
*p = tmp8;
}
}
#else
#define ENTITY_SWAP(E) {}
#endif
/*
STATIC dec_2_emdb_trole[] =
{
EM_TEMP_ROLE_INT,
EM_TEMP_ROLE_MEM,
EM_TEMP_ROLE_FP,
EM_TEMP_ROLE_BR,
EM_TEMP_ROLE_LONG
};
*/
/********************************************************************************/
/* em_decoder_open: opens a new entry in the em_clients_table and returns the */
/* index of the entry. */
/********************************************************************************/
EM_Decoder_Id em_decoder_open(void)
{
int i;
Client_Entry initiate_entry={1,
DEFAULT_MACHINE_TYPE,
DEFAULT_MACHINE_MODE,
NULL
};
for (i=0 ; i < EM_DECODER_MAX_CLIENTS ; i++)
{
if ( !(em_clients_table[i].is_used) )
{
em_clients_table[i] = initiate_entry;
if (!troles_tab_initialized)
init_pseudo_troles_tab();
return(i);
}
}
return(-1);
}
/*****************************************************************************/
/* legal_id: check whether a given id suits an active entry in the */
/* clients table. */
/*****************************************************************************/
STATIC int legal_id(int id)
{
if ((id<0)||(id>=EM_DECODER_MAX_CLIENTS))
{
return(FALSE);
}
if (!em_clients_table[id].is_used)
{
return(FALSE);
}
return(TRUE);
}
/*****************************************************************************/
/* em_decoder_close: closes an entry in the clients table for later use. */
/*****************************************************************************/
EM_Decoder_Err em_decoder_close(const EM_Decoder_Id id)
{
if (legal_id(id))
{
em_clients_table[id].is_used=0;
if (em_clients_table[id].info_ptr != NULL)
{
free(em_clients_table[id].info_ptr);
}
return(EM_DECODER_NO_ERROR);
}
else
{
return(EM_DECODER_INVALID_CLIENT_ID);
}
}
/*****************************************************************************/
/* legal_type: */
/*****************************************************************************/
STATIC int legal_type(EM_Decoder_Machine_Type type)
{
if (type < EM_DECODER_CPU_LAST)
{
return(TRUE);
}
return(FALSE);
}
/*****************************************************************************/
/* legal_mode: */
/*****************************************************************************/
STATIC int legal_mode(EM_Decoder_Machine_Type type, EM_Decoder_Machine_Mode mode)
{
if (mode == EM_DECODER_MODE_NO_CHANGE)
{
return(TRUE);
}
if ((mode > EM_DECODER_MODE_NO_CHANGE) && (mode < EM_DECODER_MODE_LAST))
{
if ((mode == EM_DECODER_MODE_EM) && (type != EM_DECODER_CPU_P7))
{
return(FALSE);
}
else
{
return(TRUE);
}
}
return(FALSE);
}
/*****************************************************************************/
/* legal_inst: */
/*****************************************************************************/
STATIC int legal_inst(EM_Decoder_Inst_Id inst, EM_Decoder_Machine_Type type)
{
if (inst < EM_INST_LAST)
{
/* unsigned int cpu_flag = deccpu_EMDB_info[inst].impls; */
switch (type)
{
case EM_DECODER_CPU_P7:
return TRUE;
default:
/*assert(0);*/
break;
}
}
return(FALSE);
}
/****************************************************************************/
/* em_decoder_setenv: sets the machine type and machine mode variables. */
/****************************************************************************/
EM_Decoder_Err em_decoder_setenv(const EM_Decoder_Id id,
const EM_Decoder_Machine_Type type,
const EM_Decoder_Machine_Mode mode)
{
if (!legal_id(id))
{
return(EM_DECODER_INVALID_CLIENT_ID);
}
if (!legal_type(type))
{
return(EM_DECODER_INVALID_MACHINE_TYPE);
}
if (!legal_mode(type, mode))
{
return(EM_DECODER_INVALID_MACHINE_MODE);
}
if (type == EM_DECODER_CPU_DEFAULT)
{
em_clients_table[id].machine_type = DEFAULT_MACHINE_TYPE;
}
else if (type != EM_DECODER_CPU_NO_CHANGE)
{
em_clients_table[id].machine_type = type;
}
if (mode == EM_DECODER_MODE_DEFAULT)
{
em_clients_table[id].machine_mode = DEFAULT_MACHINE_MODE;
}
else if (mode != EM_DECODER_MODE_NO_CHANGE)
{
em_clients_table[id].machine_mode = mode;
}
return(EM_DECODER_NO_ERROR);
}
/******************************************************************************/
/* em_decoder_setup: sets the machine type, machine mode variables and flags. */
/******************************************************************************/
EM_Decoder_Err em_decoder_setup(const EM_Decoder_Id id,
const EM_Decoder_Machine_Type type,
const EM_Decoder_Machine_Mode mode,
unsigned long flags)
{
EM_Decoder_Err err;
if ((err=em_decoder_setenv(id, type, mode)) != EM_DECODER_NO_ERROR)
{
return (err);
}
em_clients_table[id].flags = flags;
return (EM_DECODER_NO_ERROR);
}
/********************************************************************************/
/* em_decoder_init_decoder_info: initializes decoder_info in case of no memset. */
/********************************************************************************/
STATIC void em_decoder_init_decoder_info(EM_Decoder_Info *decoder_info)
{
decoder_info->pred.valid = FALSE;
decoder_info->src1.type = EM_DECODER_NO_OPER;
decoder_info->src1.oper_flags = 0;
decoder_info->src2.type = EM_DECODER_NO_OPER;
decoder_info->src2.oper_flags = 0;
decoder_info->src3.type = EM_DECODER_NO_OPER;
decoder_info->src3.oper_flags = 0;
decoder_info->src4.type = EM_DECODER_NO_OPER;
decoder_info->src4.oper_flags = 0;
decoder_info->src5.type = EM_DECODER_NO_OPER;
decoder_info->src5.oper_flags = 0;
decoder_info->dst1.type = EM_DECODER_NO_OPER;
decoder_info->dst1.oper_flags = 0;
decoder_info->dst2.type = EM_DECODER_NO_OPER;
decoder_info->dst1.oper_flags = 0;
}
/******************************************************************************/
/* em_decoder_init_bundle_info: initializes bundle_info in case of no memset. */
/******************************************************************************/
STATIC void em_decoder_init_bundle_info(EM_Decoder_Bundle_Info *bundle_info)
{
unsigned int slot;
for (slot=0; slot<3; slot++)
{
em_decoder_init_decoder_info(bundle_info->inst_info+slot);
bundle_info->inst_info[slot].EM_info.em_flags = 0;
}
}
/*******************************************************************************/
/* em_decoder_associate_one: adds to the client's entry a pointer to an extra */
/* information about a single instruction (inst). */
/*******************************************************************************/
EM_Decoder_Err em_decoder_associate_one(const EM_Decoder_Id id,
const EM_Decoder_Inst_Id inst,
const void * client_info)
{
int i;
int n_insts;
if (!legal_id(id))
{
return(EM_DECODER_INVALID_CLIENT_ID);
}
if (!legal_inst(inst, em_clients_table[id].machine_type))
{
return(EM_DECODER_INVALID_INST_ID);
}
{
n_insts = EM_INST_LAST; /*** assume MAX. repair ***/
}
if (em_clients_table[id].info_ptr == NULL)
{
em_clients_table[id].info_ptr = calloc((size_t)n_insts, sizeof(void *));
if (!em_clients_table[id].info_ptr)
{
return EM_DECODER_INTERNAL_ERROR;
}
for (i=0 ; i < n_insts ; i++)
{
em_clients_table[id].info_ptr[i] = NULL;
}
}
em_clients_table[id].info_ptr[inst] = (void *)client_info;
return(EM_DECODER_NO_ERROR);
}
/*****************************************************************************
* em_decoder_associate_check - check the client's array of association *
* valid for P7 cpu only *
*****************************************************************************/
EM_Decoder_Err em_decoder_associate_check(const EM_Decoder_Id id,
EM_Decoder_Inst_Id * inst)
{
EM_Decoder_Inst_Id i;
if(!legal_id(id))
{
return(EM_DECODER_INVALID_CLIENT_ID);
}
if (em_clients_table[id].machine_type == EM_DECODER_CPU_P7)
{
if (em_clients_table[id].machine_mode == EM_DECODER_MODE_EM)
{
if(em_clients_table[id].info_ptr == NULL)
{
*inst = 1;
return(EM_DECODER_ASSOCIATE_MISS);
}
for (i = 1;
(i < EM_INST_LAST) &&
(em_clients_table[id].info_ptr[i] != NULL);
i++);
if (i < EM_INST_LAST)
{
*inst = i;
return(EM_DECODER_ASSOCIATE_MISS);
}
}
else /*** iA ***/
{
}
*inst = EM_DECODER_INST_NONE;
return(EM_DECODER_NO_ERROR);
}
else /* cpu is p5, p6 */
{
*inst = EM_DECODER_INST_NONE;
return(EM_DECODER_NO_ERROR);
}
}
/******************************************************************************
* em_decoder_decode *
* *
* params: *
* id - decoder client id *
* code - pointer to instruction buffer *
* max_code_size - instruction buffer size *
* decoder_info - pointer to decoder_info to fill *
* *
* returns: *
* EM_Decoder_Err *
* *
*****************************************************************************/
EM_Decoder_Err em_decoder_decode(const EM_Decoder_Id id,
const unsigned char * code,
const int max_code_size,
const EM_IL location,
EM_Decoder_Info * decoder_info)
{
EM_Decoder_Err err = EM_DECODER_NO_ERROR;
if (!legal_id(id))
{
return(EM_DECODER_INVALID_CLIENT_ID);
}
if (decoder_info == NULL)
{
return(EM_DECODER_NULL_PTR);
}
if (code == NULL)
{
return(EM_DECODER_TOO_SHORT_ERR);
}
if (EM_DECODER_FLAGS__NO_MEMSET(em_clients_table[id].flags))
{
em_decoder_init_decoder_info(decoder_info);
}
else
{
memset(decoder_info, 0, sizeof(EM_Decoder_Info));
}
if (em_clients_table[id].machine_mode == EM_DECODER_MODE_EM)
{
err = em_decoding(id, code, max_code_size, location, decoder_info);
}
else
{
err = EM_DECODER_INVALID_MACHINE_MODE;
}
return(err);
}
/*****************************************************************************/
/* em_decoder_inst_static_info: return instruction static info (flags, */
/* client_info pointer and static_info pointer) */
/*****************************************************************************/
EM_Decoder_Err em_decoder_inst_static_info(const EM_Decoder_Id id,
const EM_Decoder_Inst_Id inst_id,
EM_Decoder_Inst_Static_Info * static_info)
{
if (!legal_id(id))
{
return(EM_DECODER_INVALID_CLIENT_ID);
}
if (!legal_inst(inst_id, em_clients_table[id].machine_type))
{
return(EM_DECODER_INVALID_INST_ID);
}
if (static_info == NULL)
{
return(EM_DECODER_NULL_PTR);
}
if (em_clients_table[id].info_ptr != NULL)
{
static_info->client_info = em_clients_table[id].info_ptr[inst_id];
}
else
{
static_info->client_info = NULL;
}
static_info->static_info = em_decoder_static_info + inst_id;
return(EM_DECODER_NO_ERROR);
}
/******************************************************************************
* em_decoder_decode_bundle - decode em bundle *
* *
* params: *
* id - decoder client id *
* code - pointer to instruction buffer *
* max_code_size - instruction buffer size(Should be at least 3*128 *
* bundle_info - pointer to bundle_info to fill *
* *
* returns: *
* EM_Decoder_Err *
* *
*****************************************************************************/
EM_Decoder_Err em_decoder_decode_bundle(const EM_Decoder_Id id,
const unsigned char* code,
const int max_size,
EM_Decoder_Bundle_Info* bundle_info)
{
unsigned int slot_no;
U128 bundle;
U64 instr;
EM_template_t templt;
Temp_role_t temp_role;
EM_Decoder_Info *decoder_info;
int bundle_stop;
EM_Decoder_Err err, return_err = EM_DECODER_NO_ERROR;
if (!legal_id(id))
{
return(EM_DECODER_INVALID_CLIENT_ID);
}
if (bundle_info == NULL)
{
return(EM_DECODER_NULL_PTR);
}
if (EM_DECODER_FLAGS__NO_MEMSET(em_clients_table[id].flags))
{
em_decoder_init_bundle_info(bundle_info);
}
else
{
memset(bundle_info, 0, sizeof(EM_Decoder_Bundle_Info));
}
bundle = *(const U128 *)code;
ENTITY_SWAP(bundle);
templt = EM_GET_TEMPLATE(bundle);
if (max_size < EM_BUNDLE_SIZE)
{
return(EM_DECODER_TOO_SHORT_ERR);
}
bundle_info->em_bundle_info.flags = 0;
if (bundle_stop = (IEL_GETDW0(bundle) & (1<<EM_SBIT_POS)))
bundle_info->em_bundle_info.flags |= EM_DECODER_BIT_BUNDLE_STOP;
if (EM_TEMPLATE_IS_RESERVED(templt))
return(EM_DECODER_INVALID_TEMPLATE);
bundle_info->em_bundle_info.b_template = templt;
/*** Decode 3 instruction (unless long 2-slot instruction) ***/
for(slot_no = 0; slot_no < 3; slot_no++)
{
decoder_info = &(bundle_info->inst_info[slot_no]);
decoder_info->EM_info.slot_no = slot_no;
temp_role = pseudo_troles_tab[templt][slot_no];
/*** DECODER_NEXT should work even if error occurs ***/
decoder_info->size = 1 + (temp_role == EM_TEMP_ROLE_LONG);
if (temp_role == EM_TEMP_ROLE_LONG) /*** 2-slot instruction ***/
{
EM_GET_SYLLABLE(instr, bundle, slot_no+1); /* opcode is in slot 3 */
err = em_inst_decode(id, instr, temp_role, &bundle, decoder_info);
if (err == EM_DECODER_INVALID_PRM_OPCODE)
{
/* try to find nop.i or break.i in this slot */
temp_role = EM_TEMP_ROLE_INT;
err = em_inst_decode(id, instr, temp_role, &bundle, decoder_info);
if (!err)
{
if (!EM_DECODER_CHECK_OK_IN_MLX(decoder_info))
err = EM_DECODER_INVALID_PRM_OPCODE;
}
}
}
else
{
EM_GET_SYLLABLE(instr, bundle, slot_no);
err = em_inst_decode(id, instr, temp_role, &bundle, decoder_info);
if (!err)
{
if ((EM_DECODER_CHECK_SLOT2_ONLY(decoder_info)) && (slot_no != 2))
/*** intruction must be in slot 2 only, but... ***/
err = EM_DECODER_INVALID_SLOT_BRANCH_INST;
else if (EM_DECODER_CHECK_GROUP_LAST(decoder_info) &&
(((slot_no != 2) || !bundle_stop) && ((slot_no != 0) || (templt != EM_template_m_mi))))
/*** instruction fails to be the last in instruction group ***/
err = EM_DECODER_MUST_BE_GROUP_LAST;
}
}
/* return_err = the first worst error */
if (err)
{
FILL_PREDICATE_INFO(instr, decoder_info);
if ((!return_err) || (EM_DECODER_ERROR_IS_INST_FATAL(err)
&& !EM_DECODER_ERROR_IS_INST_FATAL(return_err)))
return_err = err;
}
bundle_info->error[slot_no] = err;
decoder_info->EM_info.em_bundle_info = bundle_info->em_bundle_info;
if (decoder_info->size == 2) /*** 2-slot instruction - exit for loop ***/
{
slot_no++;
break;
}
}
/* if ((!err) && EM_DECODER_CHECK_GROUP_LAST(decoder_info) &&
(!EM_DECODER_BUNDLE_STOP(decoder_info)))
{
*** instruction fails to be the last in instruction group ***
bundle_info->error[slot_no-1] = EM_DECODER_MUST_BE_GROUP_LAST;
if (!return_err)
return_err = EM_DECODER_MUST_BE_GROUP_LAST;
}*/
bundle_info->inst_num = slot_no;
bundle_info->inst_info[slot_no-1].EM_info.em_flags |=
EM_DECODER_BIT_LAST_INST;
if (bundle_stop)
bundle_info->inst_info[slot_no-1].EM_info.em_flags |=
EM_DECODER_BIT_CYCLE_BREAK;
if (templt == EM_template_m_mi)
bundle_info->inst_info[0].EM_info.em_flags |=
EM_DECODER_BIT_CYCLE_BREAK;
if (templt == EM_template_mi_i)
bundle_info->inst_info[1].EM_info.em_flags |=
EM_DECODER_BIT_CYCLE_BREAK;
return(return_err);
}
/******************************************************************************
* em_decoding - decode em (2.0- till ??) single instruction + bundle info *
* *
* params: *
* id - decoder client id *
* code - pointer to instruction buffer *
* max_code_size - instruction buffer size *
* location - syllable location, used to get slot # *
* decoder_info - pointer to decoder_info to fill *
* *
* returns: *
* EM_Decoder_Err *
* *
*****************************************************************************/
STATIC EM_Decoder_Err em_decoding ( const EM_Decoder_Id id,
const unsigned char * code,
const int max_code_size,
const EM_IL location,
EM_Decoder_Info * decoder_info)
{
unsigned int slot_no = EM_IL_GET_SLOT_NO(location);
U128 bundle;
U64 instr;
EM_template_t templt;
Temp_role_t temp_role;
int bundle_stop, cycle_break;
EM_Decoder_Err err;
bundle = *(const U128 *)code;
ENTITY_SWAP(bundle);
templt = EM_GET_TEMPLATE(bundle);
/*** DECODER_NEXT should work even if error occurs ***/
decoder_info->size = 1;
if (max_code_size < EM_BUNDLE_SIZE)
{
return(EM_DECODER_TOO_SHORT_ERR);
}
/******************************************************************/
/** fill EM_Info and check it ***/
/******************************************************************/
decoder_info->EM_info.em_flags =
decoder_info->EM_info.em_bundle_info.flags = 0;
if (bundle_stop = (IEL_GETDW0(bundle) & (1<<EM_SBIT_POS)))
decoder_info->EM_info.em_bundle_info.flags |=
EM_DECODER_BIT_BUNDLE_STOP;
if (EM_TEMPLATE_IS_RESERVED(templt))
return(EM_DECODER_INVALID_TEMPLATE);
decoder_info->EM_info.em_bundle_info.b_template = templt;
if (slot_no > EM_SLOT_2)
{
return(EM_DECODER_INVALID_INST_SLOT);
}
decoder_info->EM_info.slot_no = slot_no;
/***********************/
/*** decode syllable ***/
/***********************/
/*** get instruction binary. DON'T mask bits 41 and on ***/
temp_role = pseudo_troles_tab[templt][slot_no];
if (temp_role == EM_TEMP_ROLE_LONG) /*** 2-slot instruction ***/
{
decoder_info->size = 2;
EM_GET_SYLLABLE(instr, bundle, slot_no+1); /* opcode is in slot 3 */
err = em_inst_decode(id, instr, temp_role, &bundle, decoder_info);
if (err == EM_DECODER_INVALID_PRM_OPCODE)
{
/* try to find nop.i or break.i in this slot */
temp_role = EM_TEMP_ROLE_INT;
slot_no = EM_DECODER_SLOT_2;
err = em_inst_decode(id, instr, temp_role, &bundle, decoder_info);
if (!err)
{
if (!EM_DECODER_CHECK_OK_IN_MLX(decoder_info))
err = EM_DECODER_INVALID_PRM_OPCODE;
}
}
}
else
{
EM_GET_SYLLABLE(instr, bundle, slot_no);
err = em_inst_decode(id, instr, temp_role, &bundle, decoder_info);
if (!err)
{
if ((EM_DECODER_CHECK_SLOT2_ONLY(decoder_info)) && (slot_no != 2))
{
/*** intruction must be in slot 2 only, but... ***/
err = EM_DECODER_INVALID_SLOT_BRANCH_INST;
}
else if (EM_DECODER_CHECK_GROUP_LAST(decoder_info) &&
(((slot_no != 2) || !bundle_stop) && ((slot_no != 0) || (templt != EM_template_m_mi))))
{
/* instruction fails to be the last in instruction group */
err = EM_DECODER_MUST_BE_GROUP_LAST;
}
}
}
if (err) FILL_PREDICATE_INFO(instr, decoder_info);
if ((slot_no == EM_DECODER_SLOT_2)||(decoder_info->size == 2) /* 2-slot instruction */)
{
cycle_break = (bundle_stop != 0);
decoder_info->EM_info.em_flags |= EM_DECODER_BIT_LAST_INST;
}
else
{
cycle_break = ((slot_no==0) && (templt == EM_template_m_mi)) ||
((slot_no==1) && (templt == EM_template_mi_i));
}
decoder_info->EM_info.em_flags |= (cycle_break*EM_DECODER_BIT_CYCLE_BREAK);
return(err);
}
/******************************************************************************
* em_inst_decode - decode em (2.0- till ??) single syllable *
* *
* params: *
* id - decoder client id *
* instr - 64 bit, 0-40 are the syllable binary, 41-63 irrelevant *
* pseudo_trole - M/A, I/A, FP, or BR *
* bundle - original pointer to bundle, for 64-bit imm extraction *
* decoder_info - pointer to decoder_info to fill *
* *
* returns: *
* EM_Decoder_Err *
* *
*****************************************************************************/
STATIC EM_Decoder_Err em_inst_decode( const EM_Decoder_Id id,
U64 instr,
const Temp_role_t pseudo_trole,
const U128 * bundle_p,
EM_Decoder_Info * decoder_info)
{
Inst_id_t inst_id;
EM_Decoder_Err err;
U64 tmp64;
unsigned int major_opc, inst_center;
Node_t node;
int part_place, part_size, part_value, index;
deccpu_EMDB_info_t * emdb_entry_p;
EM_Decoder_static_info_t *static_entry_p;
Template_role_t trole;
/*** find major opcode ***/
major_opc = IEL_GETDW1(instr); /*** assumes pos > 31 ***/
major_opc >>= (EM_MAJOR_OPCODE_POS - 32);
major_opc &= ((1<<EM_MAJOR_OPCODE_BITS)-1); /*** mask out bits 41-64 ***/
/*** instruction bits 6-36 (without pred/major-opcode) to inst_center ***/
/*** done to accelerate mask/shift in main loop (aviods IEL use). ***/
IEL_SHR(tmp64, instr, PRED_SIZE); /*** bits 6-40 --> 0-34 ***/
inst_center = IEL_GETDW0(tmp64); /*** original bits 6-37 ***/
/*** walk through decoder decision tree ***/
node = em_decision_tree[SQUARE(major_opc, pseudo_trole)];
while (!NODE_IS_LEAF(node))
{
part_place = GET_NODE_POS(node) - PRED_SIZE;
part_size = GET_NODE_SIZE(node);
if (part_place < 0) /*** extensions in bits 0-5 ***/
{
part_place += PRED_SIZE;
part_value = (IEL_GETDW0(instr) >> part_place) & ((1<<part_size)-1);
}
else
part_value = (inst_center >> part_place) & ((1<<part_size)-1);
index = GET_NEXT_NODE_INDEX(node) + part_value;
node = em_decision_tree[index];
}
/*** leaf found - emdb line identified ***/
inst_id = GET_NEXT_NODE_INDEX(node);
decoder_info->flags = 0;
/*define machine behaviour within illegal opcode */
{
Behaviour_ill_opcode machine_behaviour;
/*Template_role_t em_trole = dec_2_emdb_trole[pseudo_trole];*/
PRED_BEHAVIOUR(pseudo_trole, major_opc, machine_behaviour);
if (machine_behaviour == BEHAVIOUR_UNDEF)
{
/* branch region with opcode 0 */
/* check bit 32*/
int decision_bit;
GET_BRANCH_BEHAVIOUR_BIT(instr, decision_bit);
if (decision_bit)
{
machine_behaviour = BEHAVIOUR_FAULT;
}
else
{
machine_behaviour = BEHAVIOUR_IGNORE_ON_FALSE_QP;
}
}
if (machine_behaviour == BEHAVIOUR_FAULT)
{
EM_DECODER_SET_UNC_ILLEGAL_FAULT(decoder_info);
}
}
if ((inst_id >= EM_INST_LAST) || inst_id == EM_ILLOP)
{
if (pseudo_trole == EM_TEMP_ROLE_BR)
{
/*** search for ignored fields ***/
switch (major_opc)
{
case 0:
{
unsigned int x6_ext;
U64 ext;
/*** get extention in bits 27:32 ***/
IEL_SHR(ext, instr, 27);
x6_ext = IEL_GETDW0(ext) & ((1<<6) - 1);
if (x6_ext == 1)
{
/*** nop.b has to be returned ***/
inst_id = EM_NOP_B_IMM21;
}
else
return(EM_DECODER_INVALID_PRM_OPCODE);
break;
}
case 2:
{
unsigned int x6_ext;
U64 ext;
/*** get extention in bits 27:32 ***/
IEL_SHR(ext, instr, 27);
x6_ext = IEL_GETDW0(ext) & ((1<<6) - 1);
switch (x6_ext)
{
case 0:
case 16:
case 17:
return (EM_DECODER_INVALID_PRM_OPCODE);
default:
/*** nop.b has to be returned ***/
inst_id = EM_NOP_B_IMM21;
}
break;
}
default:
return(EM_DECODER_INVALID_PRM_OPCODE);
}
/*** zero the inst encoding: pred and operands extracted below will be 0 ***/
IEL_ZERO(instr);
}
else return(EM_DECODER_INVALID_PRM_OPCODE);
}
if (! legal_inst(inst_id, em_clients_table[id].machine_type))
{ /*** inst does not belong to the specified machine IS ***/
return(EM_DECODER_INVALID_PRM_OPCODE);
}
decoder_info->inst = inst_id;
emdb_entry_p = deccpu_EMDB_info + inst_id;
static_entry_p = (EM_Decoder_static_info_t *)em_decoder_static_info + inst_id;
/*** get instruction static info ***/
decoder_info->flags |= static_entry_p->flags;
decoder_info->EM_info.eut = trole = static_entry_p->template_role;
if (EM_DECODER_CHECK_TWO_SLOT(decoder_info))
{
/*** IMPORTANT: emdb flags already set from the static info !!! ***/
decoder_info->EM_info.em_flags |= EM_DECODER_BIT_LONG_INST;
/*** decoder_info->size = 2; *** should be already done ***/
}
/*** else *** should be already done ***
{
decoder_info->size = 1;
}
***/
/*** handle client and static info ***/
if (em_clients_table[id].info_ptr != NULL)
{
decoder_info->client_info = em_clients_table[id].info_ptr[inst_id];
}
else
{
decoder_info->client_info = NULL;
}
decoder_info->static_info = static_entry_p;
/*** Decode predicate register ***/
if (static_entry_p->flags & EM_FLAG_PRED)
{
FILL_PREDICATE_INFO(instr, decoder_info)
}
/*** decode operands NYI ***/
err = emdb_entry_p->format_function(emdb_entry_p, instr, bundle_p,
decoder_info);
return(err);
}
/************************ misc. API functions ********************************/
const char* em_decoder_ver_str()
{
return(em_ver_string);
}
const char* em_decoder_err_msg(EM_Decoder_Err error)
{
if (error>=EM_DECODER_LAST_ERROR)
{
error = EM_DECODER_INTERNAL_ERROR;
}
return(em_err_msg[error]);
}
void em_decoder_get_version(EM_library_version_t *dec_version)
{
if (dec_version != NULL)
{
dec_version->xversion.major = XVER_MAJOR;
dec_version->xversion.minor = XVER_MINOR;
dec_version->api.major = API_MAJOR;
dec_version->api.minor = API_MINOR;
dec_version->emdb.major = deccpu_emdb_version.major;
dec_version->emdb.minor = deccpu_emdb_version.minor;
strcpy(dec_version->date, __DATE__);
strcpy(dec_version->time, __TIME__);
}
}
/****************************************************************************/