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Copy pathmsgDecoder.c
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280 lines (231 loc) · 9.22 KB
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/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Msg Decoder Module
* ==================
*
* Decoding of individual messages from the decoded stream according to the
* specification in Appendix D4 of the ARMv7-M Architecture Refrence Manual
* document available from https://static.docs.arm.com/ddi0403/e/DDI0403E_B_armv7m_arm.pdf
*/
#include <string.h>
#include <assert.h>
#include "itmDecoder.h"
#include "msgDecoder.h"
#include "generics.h"
// ====================================================================================================
// ====================================================================================================
// ====================================================================================================
// Internal routines
// ====================================================================================================
// ====================================================================================================
// ====================================================================================================
static bool _handleException( struct ITMPacket *packet, struct excMsg *decoded )
{
decoded->msgtype = MSG_EXCEPTION;
decoded->exceptionNumber = ( ( packet->d[1] & 0x01 ) << 8 ) | packet->d[0];
decoded->eventType = packet->d[1] >> 4;
return true;
}
// ====================================================================================================
static bool _handleDWTEvent( struct ITMPacket *packet, struct dwtMsg *decoded )
{
decoded->msgtype = MSG_DWT_EVENT;
decoded->event = packet->d[0] & 0x2F;
return true;
}
// ====================================================================================================
static bool _handlePCSample( struct ITMPacket *packet, struct pcSampleMsg *decoded )
/* We got a sample of the PC */
{
decoded->msgtype = MSG_PC_SAMPLE;
if ( packet->len == 1 )
{
decoded->sleep = true;
}
else
{
decoded->sleep = false;
decoded->pc = ( packet->d[3] << 24 ) | ( packet->d[2] << 16 ) | ( packet->d[1] << 8 ) | ( packet->d[0] );
}
return true;
}
// ====================================================================================================
static bool _handleDataRWWP( struct ITMPacket *packet, struct watchMsg *decoded )
/* We got an alert due to a watch pointer */
{
decoded->msgtype = MSG_DATA_RWWP;
decoded->comp = ( packet->srcAddr >> 1 ) & 0x3;
decoded->isWrite = ( ( packet->srcAddr & 0x01 ) != 0 );
switch ( packet->len )
{
case 1:
decoded->data = packet->d[0];
break;
case 2:
decoded->data = ( packet->d[0] ) | ( ( packet->d[1] ) << 8 );
break;
default:
decoded->data = ( packet->d[0] ) | ( ( packet->d[1] ) << 8 ) | ( ( packet->d[2] ) << 16 ) | ( ( packet->d[3] ) << 24 );
break;
}
return true;
}
// ====================================================================================================
static bool _handleDataAccessWP( struct ITMPacket *packet, struct wptMsg *decoded )
/* We got an alert due to a watchpoint */
{
decoded->msgtype = MSG_DATA_ACCESS_WP;
decoded->comp = ( packet->srcAddr >> 1 ) & 0x3;
decoded->data = ( packet->d[0] ) | ( ( packet->d[1] ) << 8 ) | ( ( packet->d[2] ) << 16 ) | ( ( packet->d[3] ) << 24 );
return true;
}
// ====================================================================================================
static bool _handleDataOffsetWP( struct ITMPacket *packet, struct oswMsg *decoded )
/* We got an alert due to an offset write event */
{
decoded->msgtype = MSG_OSW;
decoded->comp = ( packet->srcAddr >> 1 ) & 0x3;
decoded->offset = ( packet->d[0] ) | ( ( packet->d[1] ) << 8 );
return true;
}
// ====================================================================================================
static bool _handleHW( struct ITMPacket *packet, struct msg *decoded )
/* ... a hardware event has been received, dispatch it */
{
bool wasDecoded = false;
decoded->genericMsg.msgtype = MSG_NONE;
switch ( packet->srcAddr )
{
// --------------
case 0: /* DWT Event */
wasDecoded = _handleDWTEvent( packet, ( struct dwtMsg * )decoded );
break;
// --------------
case 1: /* Exception */
wasDecoded = _handleException( packet, ( struct excMsg * )decoded );
break;
// --------------
case 2: /* PC Counter Sample */
wasDecoded = _handlePCSample( packet, ( struct pcSampleMsg * )decoded );
break;
// --------------
default:
if ( ( ( packet->srcAddr & 0x19 ) == 0x10 ) || ( ( packet->srcAddr & 0x19 ) == 0x11 ) )
{
wasDecoded = _handleDataRWWP( packet, ( struct watchMsg * )decoded );
}
else if ( ( packet->srcAddr & 0x19 ) == 0x08 )
{
wasDecoded = _handleDataAccessWP( packet, ( struct wptMsg * )decoded );
}
else if ( ( packet->srcAddr & 0x19 ) == 0x09 )
{
wasDecoded = _handleDataOffsetWP( packet, ( struct oswMsg * )decoded );
}
break;
// --------------
}
return wasDecoded;
}
// ====================================================================================================
static bool _handleSW( struct ITMPacket *packet, struct swMsg *decoded )
{
decoded->msgtype = MSG_SOFTWARE;
decoded->srcAddr = packet->srcAddr;
decoded->len = packet->len;
/* Build 32 bit value the long way around to avoid type-punning issues */
decoded->value =
( packet->d[3] << 24 ) |
( packet->d[2] << 16 ) |
( packet->d[1] << 8 ) |
( packet->d[0] );
return true;
}
// ====================================================================================================
static bool _handleNISYNC( struct ITMPacket *packet, struct nisyncMsg *decoded )
{
decoded->msgtype = MSG_NISYNC;
decoded->type = packet->d[0];
decoded->addr =
( packet->d[1] & 0xFE ) |
( packet->d[2] << 8 ) |
( packet->d[3] << 16 ) |
( packet->d[4] << 24 );
return true;
}
// ====================================================================================================
static bool _handleTS( struct ITMPacket *packet, struct TSMsg *decoded )
/* ... a timestamp */
{
decoded->msgtype = MSG_TS;
uint32_t stamp = 0;
if ( !( ( packet->d[0] ) & 0x80 ) )
{
/* This is packet format 2 ... just a simple increment */
stamp = packet->d[0] >> 4;
}
else
{
/* This is packet format 1 ... full decode needed */
decoded->timeStatus = ( packet->d[0] & 0x30 ) >> 4;
stamp = ( packet->d[1] ) & 0x7f;
if ( packet->len > 2 )
{
stamp |= ( packet->d[2] & 0x7F ) << 7;
}
if ( packet->len > 3 )
{
stamp |= ( packet->d[3] & 0x7F ) << 14;
}
if ( packet->len > 4 )
{
stamp |= ( packet->d[4] & 0x7f ) << 21;
}
}
decoded->timeInc = stamp;
return true;
}
// ====================================================================================================
// ====================================================================================================
// ====================================================================================================
// Publically available routines
// ====================================================================================================
// ====================================================================================================
// ====================================================================================================
bool msgDecoder( struct ITMPacket *packet, struct msg *decoded )
{
bool wasDecoded = false;
decoded->genericMsg.msgtype = MSG_NONE;
decoded->genericMsg.ts = genericsTimestampuS(); /* Stamp as early as possible, even if its not real */
switch ( packet->type )
{
case ITM_PT_NONE:
decoded->genericMsg.msgtype = MSG_NONE;
break;
case ITM_PT_TS:
wasDecoded = _handleTS( packet, ( struct TSMsg * )decoded );
break;
case ITM_PT_SW:
wasDecoded = _handleSW( packet, ( struct swMsg * )decoded );
break;
case ITM_PT_HW:
wasDecoded = _handleHW( packet, decoded );
break;
case ITM_PT_NISYNC:
wasDecoded = _handleNISYNC( packet, ( struct nisyncMsg * )decoded );
break;
case ITM_PT_XTN:
genericsReport( V_INFO, "Unknown Extension Packet Received" EOL );
decoded->genericMsg.msgtype = MSG_UNKNOWN;
break;
case ITM_PT_RSRVD:
genericsReport( V_INFO, "Reserved Packet Received" EOL );
decoded->genericMsg.msgtype = MSG_RESERVED;
break;
default:
decoded->genericMsg.msgtype = MSG_ERROR;
break;
}
return wasDecoded;
}
// ====================================================================================================
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