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Merge pull request #513 from lioncash/cleanup 

arm: Cleanup.
This commit is contained in:
bunnei 2015-01-30 15:30:30 -05:00
parent c8c3a94b20 09a66860e2
commit 88a62b671b
6 changed files with 162 additions and 1661 deletions
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925
src/core/arm/interpreter/armemu.cpp
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File diff suppressed because it is too large Load Diff

276
src/core/arm/interpreter/arminit.cpp
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@ -15,8 +15,6 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
//#include <unistd.h>
#include "core/arm/skyeye_common/armdefs.h"
#include "core/arm/skyeye_common/armemu.h"
@ -24,14 +22,14 @@
* Definitions for the emulator architecture *
\***************************************************************************/
void ARMul_EmulateInit (void);
ARMul_State *ARMul_NewState (ARMul_State * state);
void ARMul_Reset (ARMul_State * state);
ARMword ARMul_DoCycle (ARMul_State * state);
unsigned ARMul_DoCoPro (ARMul_State * state);
ARMword ARMul_DoProg (ARMul_State * state);
ARMword ARMul_DoInstr (ARMul_State * state);
void ARMul_Abort (ARMul_State * state, ARMword address);
void ARMul_EmulateInit();
ARMul_State* ARMul_NewState(ARMul_State* state);
void ARMul_Reset (ARMul_State* state);
ARMword ARMul_DoCycle(ARMul_State* state);
unsigned ARMul_DoCoPro(ARMul_State* state);
ARMword ARMul_DoProg(ARMul_State* state);
ARMword ARMul_DoInstr(ARMul_State* state);
void ARMul_Abort(ARMul_State* state, ARMword address);
unsigned ARMul_MultTable[32] = {
1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9,
@ -40,47 +38,16 @@ unsigned ARMul_MultTable[32] = {
ARMword ARMul_ImmedTable[4096]; /* immediate DP LHS values */
char ARMul_BitList[256]; /* number of bits in a byte table */
//chy 2006-02-22 add test debugmode
extern int debugmode;
extern int remote_interrupt( void );
void arm_dyncom_Abort(ARMul_State * state, ARMword vector)
{
ARMul_Abort(state, vector);
}
/* ahe-ykl : the following code to initialize user mode
code is architecture dependent and probably model dependant. */
/*#include "skyeye_arch.h"
#include "skyeye_pref.h"
#include "skyeye_exec_info.h"
#include "bank_defs.h"*/
//#include "armcpu.h"
//#include "skyeye_callback.h"
/*
ARM_CPU_State* cpu = get_current_cpu();
arm_core_t* core = &cpu->core[0];
uint32_t sp = info->initial_sp;
core->Cpsr = 0x10; // User mode
// FIXME: may need to add thumb
core->Reg[13] = sp;
core->Reg[10] = info->start_data;
core->Reg[0] = 0;
bus_read(32, sp + 4, &(core->Reg[1]));
bus_read(32, sp + 8, &(core->Reg[2]));
*/
/***************************************************************************\
* Call this routine once to set up the emulator's tables. *
\***************************************************************************/
void
ARMul_EmulateInit (void)
void ARMul_EmulateInit()
{
unsigned int i, j;
@ -102,9 +69,7 @@ ARMul_EmulateInit (void)
/***************************************************************************\
* Returns a new instantiation of the ARMulator's state *
\***************************************************************************/
ARMul_State *
ARMul_NewState (ARMul_State *state)
ARMul_State* ARMul_NewState(ARMul_State* state)
{
unsigned i, j;
@ -120,7 +85,6 @@ ARMul_NewState (ARMul_State *state)
state->Spsr[i] = 0;
state->Mode = 0;
state->CallDebug = FALSE;
state->Debug = FALSE;
state->VectorCatch = 0;
state->Aborted = FALSE;
@ -128,34 +92,6 @@ ARMul_NewState (ARMul_State *state)
state->Inted = 3;
state->LastInted = 3;
state->CommandLine = NULL;
state->EventSet = 0;
state->Now = 0;
state->EventPtr =
(struct EventNode **) malloc ((unsigned) EVENTLISTSIZE *
sizeof (struct EventNode *));
#if DIFF_STATE
state->state_log = fopen("/data/state.log", "w");
printf("create pc log file.\n");
#endif
if (state->EventPtr == NULL) {
printf ("SKYEYE: ARMul_NewState malloc state->EventPtr error\n");
exit(-1);
//skyeye_exit (-1);
}
for (i = 0; i < EVENTLISTSIZE; i++)
*(state->EventPtr + i) = NULL;
#if SAVE_LOG
state->state_log = fopen("/tmp/state.log", "w");
printf("create pc log file.\n");
#else
#if DIFF_LOG
state->state_log = fopen("/tmp/state.log", "r");
printf("loaded pc log file.\n");
#endif
#endif
#ifdef ARM61
state->prog32Sig = LOW;
state->data32Sig = LOW;
@ -168,28 +104,19 @@ ARMul_NewState (ARMul_State *state)
state->bigendSig = LOW;
//chy:2003-08-19
state->LastTime = 0;
state->CP14R0_CCD = -1;
/* ahe-ykl: common function for interpret and dyncom */
/*sky_pref_t *pref = get_skyeye_pref();
if (pref->user_mode_sim)
register_callback(arm_user_mode_init, Bootmach_callback);
*/
memset(&state->exclusive_tag_array[0], 0xFF, sizeof(state->exclusive_tag_array[0]) * 128);
state->exclusive_access_state = 0;
//state->cpu = (cpu_config_t *) malloc (sizeof (cpu_config_t));
//state->mem_bank = (mem_config_t *) malloc (sizeof (mem_config_t));
return (state);
return state;
}
/***************************************************************************\
* Call this routine to set ARMulator to model a certain processor *
\***************************************************************************/
void
ARMul_SelectProcessor (ARMul_State * state, unsigned properties)
void ARMul_SelectProcessor(ARMul_State* state, unsigned properties)
{
if (properties & ARM_Fix26_Prop) {
state->prog32Sig = LOW;
@ -198,26 +125,15 @@ ARMul_SelectProcessor (ARMul_State * state, unsigned properties)
state->prog32Sig = HIGH;
state->data32Sig = HIGH;
}
/* 2004-05-09 chy
below line sould be in skyeye_mach_XXX.c 's XXX_mach_init function
*/
// state->lateabtSig = HIGH;
state->is_v4 =
(properties & (ARM_v4_Prop | ARM_v5_Prop)) ? HIGH : LOW;
state->is_v4 = (properties & (ARM_v4_Prop | ARM_v5_Prop)) ? HIGH : LOW;
state->is_v5 = (properties & ARM_v5_Prop) ? HIGH : LOW;
state->is_v5e = (properties & ARM_v5e_Prop) ? HIGH : LOW;
state->is_XScale = (properties & ARM_XScale_Prop) ? HIGH : LOW;
state->is_iWMMXt = (properties & ARM_iWMMXt_Prop) ? HIGH : LOW;
/* state->is_v6 = LOW */;
/* jeff.du 2010-08-05 */
state->is_v6 = (properties & ARM_v6_Prop) ? HIGH : LOW;
state->is_ep9312 = (properties & ARM_ep9312_Prop) ? HIGH : LOW;
//chy 2005-09-19
state->is_pxa27x = (properties & ARM_PXA27X_Prop) ? HIGH : LOW;
/* shenoubang 2012-3-11 */
state->is_v7 = (properties & ARM_v7_Prop) ? HIGH : LOW;
/* Only initialse the coprocessor support once we
@ -229,11 +145,8 @@ ARMul_SelectProcessor (ARMul_State * state, unsigned properties)
/***************************************************************************\
* Call this routine to set up the initial machine state (or perform a RESET *
\***************************************************************************/
void
ARMul_Reset (ARMul_State * state)
void ARMul_Reset(ARMul_State* state)
{
//fprintf(stderr,"armul_reset 0: state-> Cpsr 0x%x, Mode %d\n",state->Cpsr,state->Mode);
state->NextInstr = 0;
if (state->prog32Sig) {
state->Reg[15] = 0;
@ -244,15 +157,13 @@ ARMul_Reset (ARMul_State * state)
state->Cpsr = INTBITS | SVC26MODE;
state->Mode = SVC26MODE;
}
//fprintf(stderr,"armul_reset 1: state-> Cpsr 0x%x, Mode %d\n",state->Cpsr,state->Mode);
//ARMul_CPSRAltered (state);
state->Bank = SVCBANK;
FLUSHPIPE;
state->EndCondition = 0;
state->ErrorCode = 0;
//fprintf(stderr,"armul_reset 2: state-> Cpsr 0x%x, Mode %d\n",state->Cpsr,state->Mode);
state->NresetSig = HIGH;
state->NfiqSig = HIGH;
state->NirqSig = HIGH;
@ -266,33 +177,6 @@ ARMul_Reset (ARMul_State * state)
state->NumIcycles = 0;
state->NumCcycles = 0;
state->NumFcycles = 0;
//fprintf(stderr,"armul_reset 3: state-> Cpsr 0x%x, Mode %d\n",state->Cpsr,state->Mode);
//mmu_reset (state);
//fprintf(stderr,"armul_reset 4: state-> Cpsr 0x%x, Mode %d\n",state->Cpsr,state->Mode);
//mem_reset (state); /* move to memory/ram.c */
//fprintf(stderr,"armul_reset 5: state-> Cpsr 0x%x, Mode %d\n",state->Cpsr,state->Mode);
/*remove later. walimis 03.7.17 */
//io_reset(state);
//lcd_disable(state);
/*ywc 2005-04-07 move from ARMul_NewState , because skyeye_config.no_dbct will
*be configured in skyeye_option_init and it is called after ARMul_NewState*/
state->tea_break_ok = 0;
state->tea_break_addr = 0;
state->tea_pc = 0;
#ifdef DBCT
if (!skyeye_config.no_dbct) {
//teawater add for arm2x86 2005.02.14-------------------------------------------
if (arm2x86_init (state)) {
printf ("SKYEYE: arm2x86_init error\n");
//skyeye_exit (-1);
}
//AJ2D--------------------------------------------------------------------------
}
#endif
}
@ -301,108 +185,23 @@ ARMul_Reset (ARMul_State * state)
* (Emulate26 for a 26 bit ARM and Emulate32 for a 32 bit ARM), return the *
* address of the last instruction that is executed. *
\***************************************************************************/
//teawater add DBCT_TEST_SPEED 2005.10.04---------------------------------------
#ifdef DBCT_TEST_SPEED
static ARMul_State *dbct_test_speed_state = NULL;
static void
dbct_test_speed_sig(int signo)
{
printf("\n0x%llx %llu\n", dbct_test_speed_state->instr_count, dbct_test_speed_state->instr_count);
exit(0);
//skyeye_exit(0);
}
#endif //DBCT_TEST_SPEED
//AJ2D--------------------------------------------------------------------------
ARMword
ARMul_DoProg (ARMul_State * state)
ARMword ARMul_DoProg(ARMul_State* state)
{
ARMword pc = 0;
/*
* 2007-01-24 removed the term-io functions by Anthony Lee,
* moved to "device/uart/skyeye_uart_stdio.c".
*/
//teawater add DBCT_TEST_SPEED 2005.10.04---------------------------------------
#ifdef DBCT_TEST_SPEED
{
if (!dbct_test_speed_state) {
//init timer
struct itimerval value;
struct sigaction act;
dbct_test_speed_state = state;
state->instr_count = 0;
act.sa_handler = dbct_test_speed_sig;
act.sa_flags = SA_RESTART;
//cygwin don't support ITIMER_VIRTUAL or ITIMER_PROF
#ifndef __CYGWIN__
if (sigaction(SIGVTALRM, &act, NULL) == -1) {
#else
if (sigaction(SIGALRM, &act, NULL) == -1) {
#endif //__CYGWIN__
fprintf(stderr, "init timer error.\n");
exit(-1);
//skyeye_exit(-1);
}
if (skyeye_config.dbct_test_speed_sec) {
value.it_value.tv_sec = skyeye_config.dbct_test_speed_sec;
} else {
value.it_value.tv_sec = DBCT_TEST_SPEED_SEC;
}
printf("dbct_test_speed_sec = %ld\n", value.it_value.tv_sec);
value.it_value.tv_usec = 0;
value.it_interval.tv_sec = 0;
value.it_interval.tv_usec = 0;
#ifndef __CYGWIN__
if (setitimer(ITIMER_VIRTUAL, &value, NULL) == -1) {
#else
if (setitimer(ITIMER_REAL, &value, NULL) == -1) {
#endif //__CYGWIN__
fprintf(stderr, "init timer error.\n");
//skyeye_exit(-1);
}
}
}
#endif //DBCT_TEST_SPEED
//AJ2D--------------------------------------------------------------------------
state->Emulate = RUN;
while (state->Emulate != STOP) {
state->Emulate = RUN;
/*ywc 2005-03-31 */
if (state->prog32Sig && ARMul_MODE32BIT) {
#ifdef DBCT
if (skyeye_config.no_dbct) {
pc = ARMul_Emulate32 (state);
} else {
pc = ARMul_Emulate32_dbct (state);
}
#else
pc = ARMul_Emulate32 (state);
#endif
}
else {
//pc = ARMul_Emulate26 (state);
}
//chy 2006-02-22, should test debugmode first
//chy 2006-04-14, put below codes in ARMul_Emulate
#if 0
if(debugmode)
if(remote_interrupt())
state->Emulate = STOP;
#endif
}
/*
* 2007-01-24 removed the term-io functions by Anthony Lee,
* moved to "device/uart/skyeye_uart_stdio.c".
*/
return (pc);
return pc;
}
/***************************************************************************\
@ -410,38 +209,17 @@ ARMul_DoProg (ARMul_State * state)
* (Emulate26 for a 26 bit ARM and Emulate32 for a 32 bit ARM), return the *
* address of the instruction that is executed. *
\***************************************************************************/
ARMword
ARMul_DoInstr (ARMul_State * state)
ARMword ARMul_DoInstr(ARMul_State* state)
{
ARMword pc = 0;
state->Emulate = ONCE;
/*ywc 2005-03-31 */
if (state->prog32Sig && ARMul_MODE32BIT) {
#ifdef DBCT
if (skyeye_config.no_dbct) {
pc = ARMul_Emulate32 (state);
} else {
//teawater add compile switch for DBCT GDB RSP function 2005.10.21--------------
#ifndef DBCT_GDBRSP
printf("DBCT GDBRSP function switch is off.\n");
printf("To use this function, open \"#define DBCT_GDBRSP\" in arch/arm/common/armdefs.h & recompile skyeye.\n");
skyeye_exit(-1);
#endif //DBCT_GDBRSP
//AJ2D--------------------------------------------------------------------------
pc = ARMul_Emulate32_dbct (state);
}
#else
pc = ARMul_Emulate32 (state);
#endif
}
//else
//pc = ARMul_Emulate26 (state);
return (pc);
return pc;
}
/***************************************************************************\
@ -449,9 +227,7 @@ ARMul_DoInstr (ARMul_State * state)
* mode, register bank, and the saving of registers. Call with the *
* appropriate vector's memory address (0,4,8 ....) *
\***************************************************************************/
void
ARMul_Abort (ARMul_State * state, ARMword vector)
void ARMul_Abort(ARMul_State* state, ARMword vector)
{
ARMword temp;
int isize = INSN_SIZE;
@ -494,21 +270,11 @@ ARMul_Abort (ARMul_State * state, ARMword vector)
SETABORT (IBIT, SVC26MODE, isize);
break;
case ARMul_IRQV: /* IRQ */
//chy 2003-09-02 the if sentence seems no use
#if 0
if (!state->is_XScale || !state->CPRead[13] (state, 0, &temp)
|| (temp & ARMul_CP13_R0_IRQ))
#endif
SETABORT (IBIT,
state->prog32Sig ? IRQ32MODE : IRQ26MODE,
esize);
break;
case ARMul_FIQV: /* FIQ */
//chy 2003-09-02 the if sentence seems no use
#if 0
if (!state->is_XScale || !state->CPRead[13] (state, 0, &temp)
|| (temp & ARMul_CP13_R0_FIQ))
#endif
SETABORT (INTBITS,
state->prog32Sig ? FIQ32MODE : FIQ26MODE,
esize);

80
src/core/arm/interpreter/armsupp.cpp
View File

@ -22,13 +22,6 @@
static ARMword ModeToBank (ARMword);
static void EnvokeList (ARMul_State *, unsigned int, unsigned int);
struct EventNode {
/* An event list node. */
unsigned (*func) (ARMul_State *); /* The function to call. */
struct EventNode *next;
};
/* This routine returns the value of a register from a mode. */
@ -1068,76 +1061,3 @@ ARMul_Align (ARMul_State* state, ARMword address, ARMword data)
address = (address & 3) << 3; /* Get the word address. */
return ((data >> address) | (data << (32 - address))); /* rot right */
}
/* This routine is used to call another routine after a certain number of
cycles have been executed. The first parameter is the number of cycles
delay before the function is called, the second argument is a pointer
to the function. A delay of zero doesn't work, just call the function. */
void
ARMul_ScheduleEvent (ARMul_State * state, unsigned int delay,
unsigned (*what) (ARMul_State *))
{
unsigned int when;
struct EventNode *event;
if (state->EventSet++ == 0)
state->Now = ARMul_Time (state);
when = (state->Now + delay) % EVENTLISTSIZE;
event = (struct EventNode *) malloc (sizeof (struct EventNode));
if (!event) {
printf ("SKYEYE:ARMul_ScheduleEvent: malloc event error\n");
exit(-1);
//skyeye_exit (-1);
}
event->func = what;
event->next = *(state->EventPtr + when);
*(state->EventPtr + when) = event;
}
/* This routine is called at the beginning of
every cycle, to envoke scheduled events. */
void
ARMul_EnvokeEvent (ARMul_State * state)
{
static unsigned int then;
then = state->Now;
state->Now = ARMul_Time (state) % EVENTLISTSIZE;
if (then < state->Now)
/* Schedule events. */
EnvokeList (state, then, state->Now);
else if (then > state->Now) {
/* Need to wrap around the list. */
EnvokeList (state, then, EVENTLISTSIZE - 1L);
EnvokeList (state, 0L, state->Now);
}
}
/* Envokes all the entries in a range. */
static void
EnvokeList (ARMul_State * state, unsigned int from, unsigned int to)
{
for (; from <= to; from++) {
struct EventNode *anevent;
anevent = *(state->EventPtr + from);
while (anevent) {
(anevent->func) (state);
state->EventSet--;
anevent = anevent->next;
}
*(state->EventPtr + from) = NULL;
}
}
/* This routine is returns the number of clock ticks since the last reset. */
unsigned int
ARMul_Time (ARMul_State * state)
{
return (state->NumScycles + state->NumNcycles +
state->NumIcycles + state->NumCcycles + state->NumFcycles);
}

437
src/core/arm/skyeye_common/armdefs.h
View File

@ -15,8 +15,7 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifndef _ARMDEFS_H_
#define _ARMDEFS_H_
#pragma once
#include <cerrno>
#include <csignal>
@ -33,21 +32,6 @@
#include "core/arm/skyeye_common/armmmu.h"
#include "core/arm/skyeye_common/skyeye_defs.h"
#if EMU_PLATFORM == PLATFORM_LINUX
#include <sys/time.h>
#include <unistd.h>
#endif
#if 0
#if 0
#define DIFF_STATE 1
#define __FOLLOW_MODE__ 0
#else
#define DIFF_STATE 0
#define __FOLLOW_MODE__ 1
#endif
#endif
#ifndef FALSE
#define FALSE 0
#define TRUE 1
@ -58,13 +42,6 @@
#define LOWHIGH 1
#define HIGHLOW 2
//#define DBCT_TEST_SPEED
#define DBCT_TEST_SPEED_SEC 10
#define ARM_BYTE_TYPE 0
#define ARM_HALFWORD_TYPE 1
#define ARM_WORD_TYPE 2
//the define of cachetype
#define NONCACHE 0
#define DATACACHE 1
@ -73,18 +50,11 @@
#define POS(i) ( (~(i)) >> 31 )
#define NEG(i) ( (i) >> 31 )
#ifndef __STDC__
typedef char *VoidStar;
#endif
typedef u64 ARMdword; // must be 64 bits wide
typedef u32 ARMword; // must be 32 bits wide
typedef u16 ARMhword; // must be 16 bits wide
typedef u8 ARMbyte; // must be 8 bits wide
typedef struct ARMul_State ARMul_State;
typedef struct ARMul_io ARMul_io;
typedef struct ARMul_Energy ARMul_Energy;
typedef unsigned ARMul_CPInits(ARMul_State* state);
typedef unsigned ARMul_CPExits(ARMul_State* state);
@ -98,65 +68,6 @@ typedef unsigned ARMul_CDPs(ARMul_State* state, unsigned type, ARMword instr);
typedef unsigned ARMul_CPReads(ARMul_State* state, unsigned reg, ARMword* value);
typedef unsigned ARMul_CPWrites(ARMul_State* state, unsigned reg, ARMword value);
//added by ksh,2004-3-5
struct ARMul_io
{
ARMword *instr; // to display the current interrupt state
ARMword *net_flag; // to judge if network is enabled
ARMword *net_int; // netcard interrupt
//ywc,2004-04-01
ARMword *ts_int;
ARMword *ts_is_enable;
ARMword *ts_addr_begin;
ARMword *ts_addr_end;
ARMword *ts_buffer;
};
/* added by ksh,2004-11-26,some energy profiling */
struct ARMul_Energy
{
int energy_prof; /* <tktan> BUG200103282109 : for energy profiling */
int enable_func_energy; /* <tktan> BUG200105181702 */
char *func_energy;
int func_display; /* <tktan> BUG200103311509 : for function call display */
int func_disp_start; /* <tktan> BUG200104191428 : to start func profiling */
char *start_func; /* <tktan> BUG200104191428 */
FILE *outfile; /* <tktan> BUG200105201531 : direct console to file */
long long tcycle, pcycle;
float t_energy;
void *cur_task; /* <tktan> BUG200103291737 */
long long t_mem_cycle, t_idle_cycle, t_uart_cycle;
long long p_mem_cycle, p_idle_cycle, p_uart_cycle;
long long p_io_update_tcycle;
/*record CCCR,to get current core frequency */
ARMword cccr;
};
#if 0
#define MAX_BANK 8
#define MAX_STR 1024
typedef struct mem_bank
{
ARMword (*read_byte) (ARMul_State* state, ARMword addr);
void (*write_byte) (ARMul_State* state, ARMword addr, ARMword data);
ARMword (*read_halfword) (ARMul_State* state, ARMword addr);
void (*write_halfword) (ARMul_State* state, ARMword addr, ARMword data);
ARMword (*read_word) (ARMul_State* state, ARMword addr);
void (*write_word) (ARMul_State* state, ARMword addr, ARMword data);
unsigned int addr, len;
char filename[MAX_STR];
unsigned type; //chy 2003-09-21: maybe io,ram,rom
} mem_bank_t;
typedef struct
{
int bank_num;
int current_num; /*current num of bank */
mem_bank_t mem_banks[MAX_BANK];
} mem_config_t;
#endif
#define VFP_REG_NUM 64
struct ARMul_State
{
@ -198,7 +109,6 @@ struct ARMul_State
ARMword NFlag, ZFlag, CFlag, VFlag, IFFlags; /* dummy flags for speed */
unsigned long long int icounter, debug_icounter, kernel_icounter;
unsigned int shifter_carry_out;
//ARMword translate_pc;
/* add armv6 flags dyf:2010-08-09 */
ARMword GEFlag, EFlag, AFlag, QFlag;
@ -226,9 +136,6 @@ struct ARMul_State
unsigned CanWatch; /* set by memory interface if its willing to suffer the
overhead of checking for watchpoints on each memory
access */
unsigned int StopHandle;
char *CommandLine; /* Command Line from ARMsd */
ARMul_CPInits *CPInit[16]; /* coprocessor initialisers */
ARMul_CPExits *CPExit[16]; /* coprocessor finalisers */
@ -244,10 +151,6 @@ struct ARMul_State
unsigned char *CPData[16]; /* Coprocessor data */
unsigned char const *CPRegWords[16]; /* map of coprocessor register sizes */
unsigned EventSet; /* the number of events in the queue */
unsigned int Now; /* time to the nearest cycle */
struct EventNode **EventPtr; /* the event list */
unsigned Debug; /* show instructions as they are executed */
unsigned NresetSig; /* reset the processor */
unsigned NfiqSig;
@ -300,17 +203,9 @@ So, if lateabtSig=1, then it means Late Abort Model(Base Updated Abort Model)
ARMword Base; /* extra hand for base writeback */
ARMword AbortAddr; /* to keep track of Prefetch aborts */
const struct Dbg_HostosInterface *hostif;
int verbose; /* non-zero means print various messages like the banner */
int mmu_inited;
//mem_state_t mem;
/*remove io_state to skyeye_mach_*.c files */
//io_state_t io;
/* point to a interrupt pending register. now for skyeye-ne2k.c
* later should move somewhere. e.g machine_config_t*/
//chy: 2003-08-11, for different arm core type
unsigned is_v4; /* Are we emulating a v4 architecture (or higher) ? */
@ -321,44 +216,17 @@ So, if lateabtSig=1, then it means Late Abort Model(Base Updated Abort Model)
unsigned is_XScale; /* Are we emulating an XScale architecture ? */
unsigned is_iWMMXt; /* Are we emulating an iWMMXt co-processor ? */
unsigned is_ep9312; /* Are we emulating a Cirrus Maverick co-processor ? */
//chy 2005-09-19
unsigned is_pxa27x; /* Are we emulating a Intel PXA27x co-processor ? */
//chy: seems only used in xscale's CP14
unsigned int LastTime; /* Value of last call to ARMul_Time() */
ARMword CP14R0_CCD; /* used to count 64 clock cycles with CP14 R0 bit 3 set */
//added by ksh:for handle different machs io 2004-3-5
ARMul_io mach_io;
/*added by ksh,2004-11-26,some energy profiling*/
ARMul_Energy energy;
//teawater add for next_dis 2004.10.27-----------------------
int disassemble;
//teawater add for arm2x86 2005.02.15-------------------------------------------
u32 trap;
u32 tea_break_addr;
u32 tea_break_ok;
int tea_pc;
//teawater add for arm2x86 2005.07.05-------------------------------------------
//arm_arm A2-18
int abort_model; //0 Base Restored Abort Model, 1 the Early Abort Model, 2 Base Updated Abort Model
//teawater change for return if running tb dirty 2005.07.09---------------------
void *tb_now;
//teawater add for record reg value to ./reg.txt 2005.07.10---------------------
FILE *tea_reg_fd;
/*added by ksh in 2005-10-1*/
cpu_config_t *cpu;
//mem_config_t *mem_bank;
/* added LPC remap function */
int vector_remap_flag;
@ -367,23 +235,12 @@ So, if lateabtSig=1, then it means Late Abort Model(Base Updated Abort Model)
u32 step;
u32 cycle;
int stop_simulator;
conf_object_t *dyncom_cpu;
//teawater add DBCT_TEST_SPEED 2005.10.04---------------------------------------
#ifdef DBCT_TEST_SPEED
uint64_t instr_count;
#endif //DBCT_TEST_SPEED
// FILE * state_log;
//diff log
//#if DIFF_STATE
FILE * state_log;
//#endif
/* monitored memory for exclusice access */
ARMword exclusive_tag_array[128];
/* 1 means exclusive access and 0 means open access */
ARMword exclusive_access_state;
memory_space_intf space;
u32 CurrInstr;
u32 last_pc; /* the last pc executed */
u32 last_instr; /* the last inst executed */
@ -392,56 +249,43 @@ So, if lateabtSig=1, then it means Late Abort Model(Base Updated Abort Model)
u32 WritePc[17];
u32 CurrWrite;
};
#define DIFF_WRITE 0
typedef ARMul_State arm_core_t;
#define ResetPin NresetSig
#define FIQPin NfiqSig
#define IRQPin NirqSig
#define AbortPin abortSig
#define TransPin NtransSig
#define BigEndPin bigendSig
#define Prog32Pin prog32Sig
#define Data32Pin data32Sig
#define LateAbortPin lateabtSig
/***************************************************************************\
* Types of ARM we know about *
\***************************************************************************/
/* The bitflags */
#define ARM_Fix26_Prop 0x01
#define ARM_Nexec_Prop 0x02
#define ARM_Debug_Prop 0x10
#define ARM_Isync_Prop ARM_Debug_Prop
#define ARM_Lock_Prop 0x20
#define ARM_v4_Prop 0x40
#define ARM_v5_Prop 0x80
#define ARM_v6_Prop 0xc0
enum {
ARM_Fix26_Prop = 0x01,
ARM_Nexec_Prop = 0x02,
ARM_Debug_Prop = 0x10,
ARM_Isync_Prop = ARM_Debug_Prop,
ARM_Lock_Prop = 0x20,
ARM_v4_Prop = 0x40,
ARM_v5_Prop = 0x80,
ARM_v6_Prop = 0xc0,
#define ARM_v5e_Prop 0x100
#define ARM_XScale_Prop 0x200
#define ARM_ep9312_Prop 0x400
#define ARM_iWMMXt_Prop 0x800
#define ARM_PXA27X_Prop 0x1000
#define ARM_v7_Prop 0x2000
ARM_v5e_Prop = 0x100,
ARM_XScale_Prop = 0x200,
ARM_ep9312_Prop = 0x400,
ARM_iWMMXt_Prop = 0x800,
ARM_PXA27X_Prop = 0x1000,
ARM_v7_Prop = 0x2000,
/* ARM2 family */
#define ARM2 (ARM_Fix26_Prop)
#define ARM2as ARM2
#define ARM61 ARM2
#define ARM3 ARM2
// ARM2 family
ARM2 = ARM_Fix26_Prop,
ARM2as = ARM2,
ARM61 = ARM2,
ARM3 = ARM2,
#ifdef ARM60 /* previous definition in armopts.h */
#undef ARM60
#endif
/* ARM6 family */
#define ARM6 (ARM_Lock_Prop)
#define ARM60 ARM6
#define ARM600 ARM6
#define ARM610 ARM6
#define ARM620 ARM6
// ARM6 family
ARM6 = ARM_Lock_Prop,
ARM60 = ARM6,
ARM600 = ARM6,
ARM610 = ARM6,
ARM620 = ARM6
};
/***************************************************************************\
@ -456,41 +300,44 @@ typedef ARMul_State arm_core_t;
* The hardware vector addresses *
\***************************************************************************/
#define ARMResetV 0L
#define ARMUndefinedInstrV 4L
#define ARMSWIV 8L
#define ARMPrefetchAbortV 12L
#define ARMDataAbortV 16L
#define ARMAddrExceptnV 20L
#define ARMIRQV 24L
#define ARMFIQV 28L
#define ARMErrorV 32L /* This is an offset, not an address ! */
enum {
ARMResetV = 0,
ARMUndefinedInstrV = 4,
ARMSWIV = 8,
ARMPrefetchAbortV = 12,
ARMDataAbortV = 16,
ARMAddrExceptnV = 20,
ARMIRQV = 24,
ARMFIQV = 28,
ARMErrorV = 32, // This is an offset, not an address!
#define ARMul_ResetV ARMResetV
#define ARMul_UndefinedInstrV ARMUndefinedInstrV
#define ARMul_SWIV ARMSWIV
#define ARMul_PrefetchAbortV ARMPrefetchAbortV
#define ARMul_DataAbortV ARMDataAbortV
#define ARMul_AddrExceptnV ARMAddrExceptnV
#define ARMul_IRQV ARMIRQV
#define ARMul_FIQV ARMFIQV
ARMul_ResetV = ARMResetV,
ARMul_UndefinedInstrV = ARMUndefinedInstrV,
ARMul_SWIV = ARMSWIV,
ARMul_PrefetchAbortV = ARMPrefetchAbortV,
ARMul_DataAbortV = ARMDataAbortV,
ARMul_AddrExceptnV = ARMAddrExceptnV,
ARMul_IRQV = ARMIRQV,
ARMul_FIQV = ARMFIQV
};
/***************************************************************************\
* Mode and Bank Constants *
\***************************************************************************/
#define USER26MODE 0L
#define FIQ26MODE 1L
#define IRQ26MODE 2L
#define SVC26MODE 3L
#define USER32MODE 16L
#define FIQ32MODE 17L
#define IRQ32MODE 18L
#define SVC32MODE 19L
#define ABORT32MODE 23L
#define UNDEF32MODE 27L
//chy 2006-02-15 add system32 mode
#define SYSTEM32MODE 31L
enum {
USER26MODE = 0,
FIQ26MODE = 1,
IRQ26MODE = 2,
SVC26MODE = 3,
USER32MODE = 16,
FIQ32MODE = 17,
IRQ32MODE = 18,
SVC32MODE = 19,
ABORT32MODE = 23,
UNDEF32MODE = 27,
SYSTEM32MODE = 31
};
#define ARM32BITMODE (state->Mode > 3)
#define ARM26BITMODE (state->Mode <= 3)
@ -499,14 +346,17 @@ typedef ARMul_State arm_core_t;
#define ARMul_MODE32BIT ARM32BITMODE
#define ARMul_MODE26BIT ARM26BITMODE
#define USERBANK 0
#define FIQBANK 1
#define IRQBANK 2
#define SVCBANK 3
#define ABORTBANK 4
#define UNDEFBANK 5
#define DUMMYBANK 6
#define SYSTEMBANK USERBANK
enum {
USERBANK = 0,
FIQBANK = 1,
IRQBANK = 2,
SVCBANK = 3,
ABORTBANK = 4,
UNDEFBANK = 5,
DUMMYBANK = 6,
SYSTEMBANK = USERBANK
};
#define BANK_CAN_ACCESS_SPSR(bank) \
((bank) != USERBANK && (bank) != SYSTEMBANK && (bank) != DUMMYBANK)
@ -525,13 +375,6 @@ extern void ARMul_Reset(ARMul_State* state);
extern ARMul_State *ARMul_NewState(ARMul_State* state);
extern ARMword ARMul_DoProg(ARMul_State* state);
extern ARMword ARMul_DoInstr(ARMul_State* state);
/***************************************************************************\
* Definitons of things for event handling *
\***************************************************************************/
extern void ARMul_ScheduleEvent(ARMul_State* state, unsigned int delay, unsigned(*func) ());
extern void ARMul_EnvokeEvent(ARMul_State* state);
extern unsigned int ARMul_Time(ARMul_State* state);
/***************************************************************************\
* Useful support routines *
@ -613,40 +456,44 @@ extern ARMword ARMul_MemAccess(ARMul_State* state, ARMword, ARMword,
* Definitons of things in the co-processor interface *
\***************************************************************************/
#define ARMul_FIRST 0
#define ARMul_TRANSFER 1
#define ARMul_BUSY 2
#define ARMul_DATA 3
#define ARMul_INTERRUPT 4
#define ARMul_DONE 0
#define ARMul_CANT 1
#define ARMul_INC 3
enum {
ARMul_FIRST = 0,
ARMul_TRANSFER = 1,
ARMul_BUSY = 2,
ARMul_DATA = 3,
ARMul_INTERRUPT = 4,
ARMul_DONE = 0,
ARMul_CANT = 1,
ARMul_INC = 3
};
#define ARMul_CP13_R0_FIQ 0x1
#define ARMul_CP13_R0_IRQ 0x2
#define ARMul_CP13_R8_PMUS 0x1
enum {
ARMul_CP13_R0_FIQ = 0x1,
ARMul_CP13_R0_IRQ = 0x2,
ARMul_CP13_R8_PMUS = 0x1,
#define ARMul_CP14_R0_ENABLE 0x0001
#define ARMul_CP14_R0_CLKRST 0x0004
#define ARMul_CP14_R0_CCD 0x0008
#define ARMul_CP14_R0_INTEN0 0x0010
#define ARMul_CP14_R0_INTEN1 0x0020
#define ARMul_CP14_R0_INTEN2 0x0040
#define ARMul_CP14_R0_FLAG0 0x0100
#define ARMul_CP14_R0_FLAG1 0x0200
#define ARMul_CP14_R0_FLAG2 0x0400
#define ARMul_CP14_R10_MOE_IB 0x0004
#define ARMul_CP14_R10_MOE_DB 0x0008
#define ARMul_CP14_R10_MOE_BT 0x000c
#define ARMul_CP15_R1_ENDIAN 0x0080
#define ARMul_CP15_R1_ALIGN 0x0002
#define ARMul_CP15_R5_X 0x0400
#define ARMul_CP15_R5_ST_ALIGN 0x0001
#define ARMul_CP15_R5_IMPRE 0x0406
#define ARMul_CP15_R5_MMU_EXCPT 0x0400
#define ARMul_CP15_DBCON_M 0x0100
#define ARMul_CP15_DBCON_E1 0x000c
#define ARMul_CP15_DBCON_E0 0x0003
ARMul_CP14_R0_ENABLE = 0x0001,
ARMul_CP14_R0_CLKRST = 0x0004,
ARMul_CP14_R0_CCD = 0x0008,
ARMul_CP14_R0_INTEN0 = 0x0010,
ARMul_CP14_R0_INTEN1 = 0x0020,
ARMul_CP14_R0_INTEN2 = 0x0040,
ARMul_CP14_R0_FLAG0 = 0x0100,
ARMul_CP14_R0_FLAG1 = 0x0200,
ARMul_CP14_R0_FLAG2 = 0x0400,
ARMul_CP14_R10_MOE_IB = 0x0004,
ARMul_CP14_R10_MOE_DB = 0x0008,
ARMul_CP14_R10_MOE_BT = 0x000c,
ARMul_CP15_R1_ENDIAN = 0x0080,
ARMul_CP15_R1_ALIGN = 0x0002,
ARMul_CP15_R5_X = 0x0400,
ARMul_CP15_R5_ST_ALIGN = 0x0001,
ARMul_CP15_R5_IMPRE = 0x0406,
ARMul_CP15_R5_MMU_EXCPT = 0x0400,
ARMul_CP15_DBCON_M = 0x0100,
ARMul_CP15_DBCON_E1 = 0x000c,
ARMul_CP15_DBCON_E0 = 0x0003
};
extern unsigned ARMul_CoProInit(ARMul_State* state);
extern void ARMul_CoProExit(ARMul_State* state);
@ -675,12 +522,9 @@ extern unsigned ARMul_OSHandleSWI(ARMul_State* state, ARMword number);
}
#endif
extern ARMword ARMul_OSLastErrorP(ARMul_State* state);
extern ARMword ARMul_Debug(ARMul_State* state, ARMword pc, ARMword instr);
extern unsigned ARMul_OSException(ARMul_State* state, ARMword vector, ARMword pc);
extern int rdi_log;
enum ConditionCode {
EQ = 0,
@ -729,70 +573,12 @@ enum ConditionCode {
#define IFFLAGS state->IFFlags
#endif //VFLAG
#define FLAG_MASK 0xf0000000
#define NBIT_SHIFT 31
#define ZBIT_SHIFT 30
#define CBIT_SHIFT 29
#define VBIT_SHIFT 28
#define SKYEYE_OUTREGS(fd) { fprintf ((fd), "R %x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,C %x,S %x,%x,%x,%x,%x,%x,%x,M %x,B %x,E %x,I %x,P %x,T %x,L %x,D %x,",\
state->Reg[0],state->Reg[1],state->Reg[2],state->Reg[3], \
state->Reg[4],state->Reg[5],state->Reg[6],state->Reg[7], \
state->Reg[8],state->Reg[9],state->Reg[10],state->Reg[11], \
state->Reg[12],state->Reg[13],state->Reg[14],state->Reg[15], \
state->Cpsr, state->Spsr[0], state->Spsr[1], state->Spsr[2],\
state->Spsr[3],state->Spsr[4], state->Spsr[5], state->Spsr[6],\
state->Mode,state->Bank,state->ErrorCode,state->instr,state->pc,\
state->temp,state->loaded,state->decoded);}
#define SKYEYE_OUTMOREREGS(fd) { fprintf ((fd),"\
RUs %x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,\
RF %x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,\
RI %x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,\
RS %x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,\
RA %x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,\
RUn %x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x\n",\
state->RegBank[0][0],state->RegBank[0][1],state->RegBank[0][2],state->RegBank[0][3], \
state->RegBank[0][4],state->RegBank[0][5],state->RegBank[0][6],state->RegBank[0][7], \
state->RegBank[0][8],state->RegBank[0][9],state->RegBank[0][10],state->RegBank[0][11], \
state->RegBank[0][12],state->RegBank[0][13],state->RegBank[0][14],state->RegBank[0][15], \
state->RegBank[1][0],state->RegBank[1][1],state->RegBank[1][2],state->RegBank[1][3], \
state->RegBank[1][4],state->RegBank[1][5],state->RegBank[1][6],state->RegBank[1][7], \
state->RegBank[1][8],state->RegBank[1][9],state->RegBank[1][10],state->RegBank[1][11], \
state->RegBank[1][12],state->RegBank[1][13],state->RegBank[1][14],state->RegBank[1][15], \
state->RegBank[2][0],state->RegBank[2][1],state->RegBank[2][2],state->RegBank[2][3], \
state->RegBank[2][4],state->RegBank[2][5],state->RegBank[2][6],state->RegBank[2][7], \
state->RegBank[2][8],state->RegBank[2][9],state->RegBank[2][10],state->RegBank[2][11], \
state->RegBank[2][12],state->RegBank[2][13],state->RegBank[2][14],state->RegBank[2][15], \
state->RegBank[3][0],state->RegBank[3][1],state->RegBank[3][2],state->RegBank[3][3], \
state->RegBank[3][4],state->RegBank[3][5],state->RegBank[3][6],state->RegBank[3][7], \
state->RegBank[3][8],state->RegBank[3][9],state->RegBank[3][10],state->RegBank[3][11], \
state->RegBank[3][12],state->RegBank[3][13],state->RegBank[3][14],state->RegBank[3][15], \
state->RegBank[4][0],state->RegBank[4][1],state->RegBank[4][2],state->RegBank[4][3], \
state->RegBank[4][4],state->RegBank[4][5],state->RegBank[4][6],state->RegBank[4][7], \
state->RegBank[4][8],state->RegBank[4][9],state->RegBank[4][10],state->RegBank[4][11], \
state->RegBank[4][12],state->RegBank[4][13],state->RegBank[4][14],state->RegBank[4][15], \
state->RegBank[5][0],state->RegBank[5][1],state->RegBank[5][2],state->RegBank[5][3], \
state->RegBank[5][4],state->RegBank[5][5],state->RegBank[5][6],state->RegBank[5][7], \
state->RegBank[5][8],state->RegBank[5][9],state->RegBank[5][10],state->RegBank[5][11], \
state->RegBank[5][12],state->RegBank[5][13],state->RegBank[5][14],state->RegBank[5][15] \
);}
#define SA1110 0x6901b110
#define SA1100 0x4401a100
#define PXA250 0x69052100
#define PXA270 0x69054110
//#define PXA250 0x69052903
// 0x69052903; //PXA250 B1 from intel 278522-001.pdf
extern bool AddOverflow(ARMword, ARMword, ARMword);
extern bool SubOverflow(ARMword, ARMword, ARMword);
extern void ARMul_UndefInstr(ARMul_State*, ARMword);
extern void ARMul_FixCPSR(ARMul_State*, ARMword, ARMword);
extern void ARMul_FixSPSR(ARMul_State*, ARMword, ARMword);
extern void ARMul_ConsolePrint(ARMul_State*, const char*, ...);
extern void ARMul_SelectProcessor(ARMul_State*, unsigned);
extern u32 AddWithCarry(u32, u32, u32, bool*, bool*);
@ -810,8 +596,3 @@ extern u16 ARMul_UnsignedSaturatedSub16(u16, u16);
extern u8 ARMul_UnsignedAbsoluteDifference(u8, u8);
extern u32 ARMul_SignedSatQ(s32, u8, bool*);
extern u32 ARMul_UnsignedSatQ(s32, u8, bool*);
#define DIFF_LOG 0
#define SAVE_LOG 0
#endif /* _ARMDEFS_H_ */

5
src/core/arm/skyeye_common/armemu.h
View File

@ -575,8 +575,6 @@ extern ARMword ARMul_GetPC (ARMul_State *);
extern ARMword ARMul_GetNextPC (ARMul_State *);
extern ARMword ARMul_GetR15 (ARMul_State *);
extern ARMword ARMul_GetCPSR (ARMul_State *);
extern void ARMul_EnvokeEvent (ARMul_State *);
extern unsigned int ARMul_Time (ARMul_State *);
extern void ARMul_NegZero (ARMul_State *, ARMword);
extern void ARMul_SetPC (ARMul_State *, ARMword);
extern void ARMul_SetR15 (ARMul_State *, ARMword);
@ -603,8 +601,7 @@ extern void ARMul_AddCarry (ARMul_State *, ARMword, ARMword, ARMword);
extern tdstate ARMul_ThumbDecode (ARMul_State *, ARMword, ARMword, ARMword *);
extern ARMword ARMul_GetReg (ARMul_State *, unsigned, unsigned);
extern void ARMul_SetReg (ARMul_State *, unsigned, unsigned, ARMword);
extern void ARMul_ScheduleEvent (ARMul_State *, unsigned int,
unsigned (*)(ARMul_State *));
/* Coprocessor support functions. */
extern unsigned ARMul_CoProInit (ARMul_State *);
extern void ARMul_CoProExit (ARMul_State *);

78
src/core/arm/skyeye_common/skyeye_defs.h
View File

@ -1,5 +1,4 @@
#ifndef CORE_ARM_SKYEYE_DEFS_H_
#define CORE_ARM_SKYEYE_DEFS_H_
#pragma once
#include "common/common.h"
@ -8,21 +7,15 @@
typedef struct
{
const char *cpu_arch_name; /*cpu architecture version name.e.g. armv4t */
const char *cpu_name; /*cpu name. e.g. arm7tdmi or arm720t */
const char *cpu_arch_name; /* CPU architecture version name.e.g. armv4t */
const char *cpu_name; /* CPU name. e.g. arm7tdmi or arm720t */
u32 cpu_val; /*CPU value; also call MMU ID or processor id;see
ARM Architecture Reference Manual B2-6 */
u32 cpu_mask; /*cpu_val's mask. */
u32 cachetype; /*this cpu has what kind of cache */
u32 cpu_mask; /* cpu_val's mask. */
u32 cachetype; /* this CPU has what kind of cache */
} cpu_config_t;
typedef struct conf_object_s{
char* objname;
void* obj;
char* class_name;
}conf_object_t;
typedef enum{
typedef enum {
/* No exception */
No_exp = 0,
/* Memory allocation exception */
@ -44,70 +37,21 @@ typedef enum{
/* Unknown exception */
Unknown_exp
}exception_t;
} exception_t;
typedef enum {
Align = 0,
UnAlign
}align_t;
} align_t;
typedef enum {
Little_endian = 0,
Big_endian
}endian_t;
//typedef int exception_t;
} endian_t;
typedef enum{
typedef enum {
Phys_addr = 0,
Virt_addr
}addr_type_t;
typedef exception_t(*read_byte_t)(conf_object_t* target, u32 addr, void *buf, size_t count);
typedef exception_t(*write_byte_t)(conf_object_t* target, u32 addr, const void *buf, size_t count);
typedef struct memory_space{
conf_object_t* conf_obj;
read_byte_t read;
write_byte_t write;
}memory_space_intf;
/*
* a running instance for a specific archteciture.
*/
typedef struct generic_arch_s
{
char* arch_name;
void (*init) (void);
void (*reset) (void);
void (*step_once) (void);
void (*set_pc)(u32 addr);
u32 (*get_pc)(void);
u32 (*get_step)(void);
//chy 2004-04-15
//int (*ICE_write_byte) (u32 addr, uint8_t v);
//int (*ICE_read_byte)(u32 addr, uint8_t *pv);
u32 (*get_regval_by_id)(int id);
u32 (*get_regnum)(void);
char* (*get_regname_by_id)(int id);
exception_t (*set_regval_by_id)(int id, u32 value);
/*
* read a data by virtual address.
*/
exception_t (*mmu_read)(short size, u32 addr, u32 * value);
/*
* write a data by a virtual address.
*/
exception_t (*mmu_write)(short size, u32 addr, u32 value);
/**
* get a signal from external
*/
//exception_t (*signal)(interrupt_signal_t* signal);
endian_t endianess;
align_t alignment;
} generic_arch_t;
} addr_type_t;
typedef u32 addr_t;
#endif