arm7_9_common.c 79.9 KB
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			arm7_9->set_special_dbgrq(target);
		} else {
			buf_set_u32(dbg_ctrl->value, EICE_DBG_CONTROL_DBGRQ, 1, 1);	
			embeddedice_store_reg(dbg_ctrl);
		}
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	}
	else
	{
		/* program watchpoint unit to match on any address
		 */
		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK], 0xffffffff);
		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK], 0xffffffff);
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		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], EICE_W_CTRL_ENABLE);
		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK], ~EICE_W_CTRL_nOPC & 0xff);
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	}

	target->debug_reason = DBG_REASON_DBGRQ;
	
	return ERROR_OK;
}

int arm7_9_debug_entry(target_t *target)
{
	int i;
	u32 context[16];
	u32* context_p[16];
	u32 r0_thumb, pc_thumb;
	u32 cpsr;
	int retval;
	/* get pointers to arch-specific information */
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	reg_t *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
	reg_t *dbg_ctrl = &arm7_9->eice_cache->reg_list[EICE_DBG_CTRL];

#ifdef _DEBUG_ARM7_9_
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	LOG_DEBUG("-");
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#endif

	if (arm7_9->pre_debug_entry)
		arm7_9->pre_debug_entry(target);

	/* program EmbeddedICE Debug Control Register to assert DBGACK and INTDIS
	 * ensure that DBGRQ is cleared
	 */
	buf_set_u32(dbg_ctrl->value, EICE_DBG_CONTROL_DBGACK, 1, 1);
	buf_set_u32(dbg_ctrl->value, EICE_DBG_CONTROL_DBGRQ, 1, 0);
	buf_set_u32(dbg_ctrl->value, EICE_DBG_CONTROL_INTDIS, 1, 1);
	embeddedice_store_reg(dbg_ctrl);
	
	arm7_9_clear_halt(target);
	
	if ((retval = jtag_execute_queue()) != ERROR_OK)
	{
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		return retval;
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	}

	if ((retval = arm7_9->examine_debug_reason(target)) != ERROR_OK)
		return retval;


	if (target->state != TARGET_HALTED)
	{
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		LOG_WARNING("target not halted");
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		return ERROR_TARGET_NOT_HALTED;
	}
	
	/* if the target is in Thumb state, change to ARM state */
	if (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_ITBIT, 1))
	{
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		LOG_DEBUG("target entered debug from Thumb state");
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		/* Entered debug from Thumb mode */
		armv4_5->core_state = ARMV4_5_STATE_THUMB;
		arm7_9->change_to_arm(target, &r0_thumb, &pc_thumb);
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		LOG_DEBUG("r0_thumb: 0x%8.8x, pc_thumb: 0x%8.8x", r0_thumb, pc_thumb);
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	}
	else
	{
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		LOG_DEBUG("target entered debug from ARM state");
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		/* Entered debug from ARM mode */
		armv4_5->core_state = ARMV4_5_STATE_ARM;
	}
	
	for (i = 0; i < 16; i++)
		context_p[i] = &context[i];
	/* save core registers (r0 - r15 of current core mode) */
	arm7_9->read_core_regs(target, 0xffff, context_p);

	arm7_9->read_xpsr(target, &cpsr, 0);
	
	if ((retval = jtag_execute_queue()) != ERROR_OK)
		return retval;
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	/* if the core has been executing in Thumb state, set the T bit */
	if (armv4_5->core_state == ARMV4_5_STATE_THUMB)
		cpsr |= 0x20;	
	
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	buf_set_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32, cpsr);
	armv4_5->core_cache->reg_list[ARMV4_5_CPSR].dirty = 0;
	armv4_5->core_cache->reg_list[ARMV4_5_CPSR].valid = 1;
	
	armv4_5->core_mode = cpsr & 0x1f;
	
	if (armv4_5_mode_to_number(armv4_5->core_mode) == -1)
	{
		target->state = TARGET_UNKNOWN;
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		LOG_ERROR("cpsr contains invalid mode value - communication failure");
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		return ERROR_TARGET_FAILURE;
	}
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	LOG_DEBUG("target entered debug state in %s mode", armv4_5_mode_strings[armv4_5_mode_to_number(armv4_5->core_mode)]);
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	if (armv4_5->core_state == ARMV4_5_STATE_THUMB)
	{
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		LOG_DEBUG("thumb state, applying fixups");
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		context[0] = r0_thumb;
		context[15] = pc_thumb;
	} else if (armv4_5->core_state == ARMV4_5_STATE_ARM)
	{
		/* adjust value stored by STM */
		context[15] -= 3 * 4;
	}

	if ((target->debug_reason == DBG_REASON_BREAKPOINT)
			|| (target->debug_reason == DBG_REASON_SINGLESTEP)
			|| (target->debug_reason == DBG_REASON_WATCHPOINT)
			|| (target->debug_reason == DBG_REASON_WPTANDBKPT)
			|| ((target->debug_reason == DBG_REASON_DBGRQ) && (arm7_9->use_dbgrq == 0)))
		context[15] -= 3 * ((armv4_5->core_state == ARMV4_5_STATE_ARM) ? 4 : 2);
	else if (target->debug_reason == DBG_REASON_DBGRQ)
		context[15] -= arm7_9->dbgreq_adjust_pc * ((armv4_5->core_state == ARMV4_5_STATE_ARM) ? 4 : 2);
	else
	{
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		LOG_ERROR("unknown debug reason: %i", target->debug_reason);
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	}

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	if (armv4_5_mode_to_number(armv4_5->core_mode)==-1)
		return ERROR_FAIL;
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	for (i=0; i<=15; i++)
	{
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		LOG_DEBUG("r%i: 0x%8.8x", i, context[i]);
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		buf_set_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, i).value, 0, 32, context[i]);
		ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, i).dirty = 0;
		ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, i).valid = 1;
	}
	
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	LOG_DEBUG("entered debug state at PC 0x%x", context[15]);
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	if (armv4_5_mode_to_number(armv4_5->core_mode)==-1)
		return ERROR_FAIL;
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	/* exceptions other than USR & SYS have a saved program status register */
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	if ((armv4_5->core_mode != ARMV4_5_MODE_USR) && (armv4_5->core_mode != ARMV4_5_MODE_SYS))
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	{
		u32 spsr;
		arm7_9->read_xpsr(target, &spsr, 1);
		jtag_execute_queue();
		buf_set_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, 16).value, 0, 32, spsr);
		ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, 16).dirty = 0;
		ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, 16).valid = 1;
	}

	/* r0 and r15 (pc) have to be restored later */
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	ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, 0).dirty = ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, 0).valid;
	ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, 15).dirty = ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, 15).valid;
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	if ((retval = jtag_execute_queue()) != ERROR_OK)
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		return retval;

	if (arm7_9->post_debug_entry)
		arm7_9->post_debug_entry(target);

	return ERROR_OK;
}

int arm7_9_full_context(target_t *target)
{
	int i;
	int retval;
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;

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	LOG_DEBUG("-");
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	if (target->state != TARGET_HALTED)
	{
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		LOG_WARNING("target not halted");
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		return ERROR_TARGET_NOT_HALTED;
	}
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	if (armv4_5_mode_to_number(armv4_5->core_mode)==-1)
		return ERROR_FAIL;
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	/* iterate through processor modes (User, FIQ, IRQ, SVC, ABT, UND)
	 * SYS shares registers with User, so we don't touch SYS
	 */
	for(i = 0; i < 6; i++)
	{
		u32 mask = 0;
		u32* reg_p[16];
		int j;
		int valid = 1;
		
		/* check if there are invalid registers in the current mode 
		 */
		for (j = 0; j <= 16; j++)
		{
			if (ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_number_to_mode(i), j).valid == 0)
				valid = 0;
		}
		
		if (!valid)
		{
			u32 tmp_cpsr;
			
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			/* change processor mode (and mask T bit) */
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			tmp_cpsr = buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 8) & 0xE0;
			tmp_cpsr |= armv4_5_number_to_mode(i);
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			tmp_cpsr &= ~0x20;
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			arm7_9->write_xpsr_im8(target, tmp_cpsr & 0xff, 0, 0);

			for (j = 0; j < 15; j++)
			{
				if (ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_number_to_mode(i), j).valid == 0)
				{	
					reg_p[j] = (u32*)ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_number_to_mode(i), j).value;
					mask |= 1 << j;
					ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_number_to_mode(i), j).valid = 1;
					ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_number_to_mode(i), j).dirty = 0;
				}
			}
			
			/* if only the PSR is invalid, mask is all zeroes */
			if (mask)
				arm7_9->read_core_regs(target, mask, reg_p);
			
			/* check if the PSR has to be read */
			if (ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_number_to_mode(i), 16).valid == 0)
			{
				arm7_9->read_xpsr(target, (u32*)ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_number_to_mode(i), 16).value, 1);
				ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_number_to_mode(i), 16).valid = 1;
				ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_number_to_mode(i), 16).dirty = 0;
			}
		}
	}

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	/* restore processor mode (mask T bit) */
	arm7_9->write_xpsr_im8(target, buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 8) & ~0x20, 0, 0);
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	if ((retval = jtag_execute_queue()) != ERROR_OK)
	{
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		return retval;
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	}
	return ERROR_OK;
}

int arm7_9_restore_context(target_t *target)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	reg_t *reg; 
	armv4_5_core_reg_t *reg_arch_info;
	enum armv4_5_mode current_mode = armv4_5->core_mode;
	int i, j;
	int dirty;
	int mode_change;
	
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	LOG_DEBUG("-");
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	if (target->state != TARGET_HALTED)
	{
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		LOG_WARNING("target not halted");
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		return ERROR_TARGET_NOT_HALTED;
	}
	
	if (arm7_9->pre_restore_context)
		arm7_9->pre_restore_context(target);
	
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	if (armv4_5_mode_to_number(armv4_5->core_mode)==-1)
		return ERROR_FAIL;
		
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	/* iterate through processor modes (User, FIQ, IRQ, SVC, ABT, UND)
	 * SYS shares registers with User, so we don't touch SYS
	 */
	for (i = 0; i < 6; i++)
	{
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		LOG_DEBUG("examining %s mode", armv4_5_mode_strings[i]);
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		dirty = 0;
		mode_change = 0;
		/* check if there are dirty registers in the current mode 
		*/
		for (j = 0; j <= 16; j++)
		{
			reg = &ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_number_to_mode(i), j);
			reg_arch_info = reg->arch_info;
			if (reg->dirty == 1)
			{
				if (reg->valid == 1)
				{
					dirty = 1;
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					LOG_DEBUG("examining dirty reg: %s", reg->name);
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					if ((reg_arch_info->mode != ARMV4_5_MODE_ANY)
						&& (reg_arch_info->mode != current_mode)
						&& !((reg_arch_info->mode == ARMV4_5_MODE_USR) && (armv4_5->core_mode == ARMV4_5_MODE_SYS)) 
						&& !((reg_arch_info->mode == ARMV4_5_MODE_SYS) && (armv4_5->core_mode == ARMV4_5_MODE_USR)))
					{
						mode_change = 1;
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						LOG_DEBUG("require mode change");
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					}
				}
				else
				{
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					LOG_ERROR("BUG: dirty register '%s', but no valid data", reg->name);
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				}
			}
		}
		
		if (dirty)
		{
			u32 mask = 0x0;
			int num_regs = 0;
			u32 regs[16];

			if (mode_change)
			{
				u32 tmp_cpsr;
			
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				/* change processor mode (mask T bit) */
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				tmp_cpsr = buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 8) & 0xE0;
				tmp_cpsr |= armv4_5_number_to_mode(i);
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				tmp_cpsr &= ~0x20;
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				arm7_9->write_xpsr_im8(target, tmp_cpsr & 0xff, 0, 0);
				current_mode = armv4_5_number_to_mode(i);
			}
			
			for (j = 0; j <= 14; j++)
			{
				reg = &ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_number_to_mode(i), j);
				reg_arch_info = reg->arch_info;
				
				
				if (reg->dirty == 1)
				{
					regs[j] = buf_get_u32(reg->value, 0, 32);
					mask |= 1 << j;
					num_regs++;
					reg->dirty = 0;
					reg->valid = 1;
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					LOG_DEBUG("writing register %i of mode %s with value 0x%8.8x", j, armv4_5_mode_strings[i], regs[j]);
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				}
			}
			
			if (mask)
			{
				arm7_9->write_core_regs(target, mask, regs);
			}
			
			reg = &ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5_number_to_mode(i), 16);
			reg_arch_info = reg->arch_info;
			if ((reg->dirty) && (reg_arch_info->mode != ARMV4_5_MODE_ANY))
			{
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				LOG_DEBUG("writing SPSR of mode %i with value 0x%8.8x", i, buf_get_u32(reg->value, 0, 32));
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				arm7_9->write_xpsr(target, buf_get_u32(reg->value, 0, 32), 1);
			}
		}
	}
	
	if ((armv4_5->core_cache->reg_list[ARMV4_5_CPSR].dirty == 0) && (armv4_5->core_mode != current_mode))
	{
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		/* restore processor mode (mask T bit) */
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		u32 tmp_cpsr;
			
		tmp_cpsr = buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 8) & 0xE0;
		tmp_cpsr |= armv4_5_number_to_mode(i);
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		tmp_cpsr &= ~0x20;
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		LOG_DEBUG("writing lower 8 bit of cpsr with value 0x%2.2x", tmp_cpsr);
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		arm7_9->write_xpsr_im8(target, tmp_cpsr & 0xff, 0, 0);
	}
	else if (armv4_5->core_cache->reg_list[ARMV4_5_CPSR].dirty == 1)
	{
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		/* CPSR has been changed, full restore necessary (mask T bit) */
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		LOG_DEBUG("writing cpsr with value 0x%8.8x", buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32));
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		arm7_9->write_xpsr(target, buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 32) & ~0x20, 0);
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		armv4_5->core_cache->reg_list[ARMV4_5_CPSR].dirty = 0;
		armv4_5->core_cache->reg_list[ARMV4_5_CPSR].valid = 1;
	}
	
	/* restore PC */
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	LOG_DEBUG("writing PC with value 0x%8.8x", buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32));
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	arm7_9->write_pc(target, buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32));
	armv4_5->core_cache->reg_list[15].dirty = 0;
			
	if (arm7_9->post_restore_context)
		arm7_9->post_restore_context(target);

	return ERROR_OK;
}

int arm7_9_restart_core(struct target_s *target)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	arm_jtag_t *jtag_info = &arm7_9->jtag_info;
	
	/* set RESTART instruction */
	jtag_add_end_state(TAP_RTI);
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	if (arm7_9->need_bypass_before_restart) {
		arm7_9->need_bypass_before_restart = 0;
		arm_jtag_set_instr(jtag_info, 0xf, NULL);
	}
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	arm_jtag_set_instr(jtag_info, 0x4, NULL);
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	jtag_add_runtest(1, TAP_RTI);
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	return jtag_execute_queue();
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1461
1462
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1465
1466
1467
1468
1469
}

void arm7_9_enable_watchpoints(struct target_s *target)
{
	watchpoint_t *watchpoint = target->watchpoints;
	
	while (watchpoint)
	{
		if (watchpoint->set == 0)
			arm7_9_set_watchpoint(target, watchpoint);
		watchpoint = watchpoint->next;
	}
}

void arm7_9_enable_breakpoints(struct target_s *target)
{
	breakpoint_t *breakpoint = target->breakpoints;
	
	/* set any pending breakpoints */
	while (breakpoint)
	{
		if (breakpoint->set == 0)
			arm7_9_set_breakpoint(target, breakpoint);
		breakpoint = breakpoint->next;
	}
}

void arm7_9_disable_bkpts_and_wpts(struct target_s *target)
{
	breakpoint_t *breakpoint = target->breakpoints;
	watchpoint_t *watchpoint = target->watchpoints;

	/* set any pending breakpoints */
	while (breakpoint)
	{
		if (breakpoint->set != 0)
			arm7_9_unset_breakpoint(target, breakpoint);
		breakpoint = breakpoint->next;
	}
	
	while (watchpoint)
	{
		if (watchpoint->set != 0)
			arm7_9_unset_watchpoint(target, watchpoint);
		watchpoint = watchpoint->next;
	}
}

int arm7_9_resume(struct target_s *target, int current, u32 address, int handle_breakpoints, int debug_execution)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	breakpoint_t *breakpoint = target->breakpoints;
	reg_t *dbg_ctrl = &arm7_9->eice_cache->reg_list[EICE_DBG_CTRL];
1470
	int err;
1471
	
1472
	LOG_DEBUG("-");
1473
1474
1475
	
	if (target->state != TARGET_HALTED)
	{
1476
		LOG_WARNING("target not halted");
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
		return ERROR_TARGET_NOT_HALTED;
	}
	
	if (!debug_execution)
	{
		target_free_all_working_areas(target);
	}
	
	/* current = 1: continue on current pc, otherwise continue at <address> */
	if (!current)
		buf_set_u32(armv4_5->core_cache->reg_list[15].value, 0, 32, address);
	
	/* the front-end may request us not to handle breakpoints */
	if (handle_breakpoints)
	{
		if ((breakpoint = breakpoint_find(target, buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32))))
		{
1494
			LOG_DEBUG("unset breakpoint at 0x%8.8x", breakpoint->address);
1495
1496
			arm7_9_unset_breakpoint(target, breakpoint);
			
1497
			LOG_DEBUG("enable single-step");
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
			arm7_9->enable_single_step(target);
			
			target->debug_reason = DBG_REASON_SINGLESTEP;

			arm7_9_restore_context(target);
			
			if (armv4_5->core_state == ARMV4_5_STATE_ARM)
				arm7_9->branch_resume(target);
			else if (armv4_5->core_state == ARMV4_5_STATE_THUMB)
			{
				arm7_9->branch_resume_thumb(target);
			}
			else
			{
1512
				LOG_ERROR("unhandled core state");
1513
				return ERROR_FAIL;
1514
1515
1516
1517
			}
				
			buf_set_u32(dbg_ctrl->value, EICE_DBG_CONTROL_DBGACK, 1, 0);
			embeddedice_write_reg(dbg_ctrl, buf_get_u32(dbg_ctrl->value, 0, dbg_ctrl->size));
1518
			err = arm7_9_execute_sys_speed(target);
1519
			
1520
			LOG_DEBUG("disable single-step");
1521
			arm7_9->disable_single_step(target);
1522
1523
1524
1525
1526
1527
1528
1529

			if (err != ERROR_OK)
			{
				arm7_9_set_breakpoint(target, breakpoint);
				target->state = TARGET_UNKNOWN;
				return err;
			}

1530
			arm7_9_debug_entry(target);
1531
			LOG_DEBUG("new PC after step: 0x%8.8x", buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32));
1532

1533
			LOG_DEBUG("set breakpoint at 0x%8.8x", breakpoint->address);
1534
1535
1536
1537
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1540
1541
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1546
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1553
			arm7_9_set_breakpoint(target, breakpoint);
		}
	}
	
	/* enable any pending breakpoints and watchpoints */
	arm7_9_enable_breakpoints(target);
	arm7_9_enable_watchpoints(target);
	
	arm7_9_restore_context(target);
	
	if (armv4_5->core_state == ARMV4_5_STATE_ARM)
	{
		arm7_9->branch_resume(target);
	}
	else if (armv4_5->core_state == ARMV4_5_STATE_THUMB)
	{
		arm7_9->branch_resume_thumb(target);
	}
	else
	{
1554
		LOG_ERROR("unhandled core state");
1555
		return ERROR_FAIL;
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
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1568
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1570
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1575
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1579
1580
1581
	}
	
	/* deassert DBGACK and INTDIS */
	buf_set_u32(dbg_ctrl->value, EICE_DBG_CONTROL_DBGACK, 1, 0);
	/* INTDIS only when we really resume, not during debug execution */
	if (!debug_execution)
		buf_set_u32(dbg_ctrl->value, EICE_DBG_CONTROL_INTDIS, 1, 0);
	embeddedice_write_reg(dbg_ctrl, buf_get_u32(dbg_ctrl->value, 0, dbg_ctrl->size));
	
	arm7_9_restart_core(target);
	
	target->debug_reason = DBG_REASON_NOTHALTED;
	
	if (!debug_execution)
	{
		/* registers are now invalid */
		armv4_5_invalidate_core_regs(target);
		target->state = TARGET_RUNNING;
		target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
	}
	else
	{
		target->state = TARGET_DEBUG_RUNNING;
		target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
	}
	
1582
	LOG_DEBUG("target resumed");
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
	
	return ERROR_OK;
}

void arm7_9_enable_eice_step(target_t *target)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	
	/* setup an inverse breakpoint on the current PC
	* - comparator 1 matches the current address
	* - rangeout from comparator 1 is connected to comparator 0 rangein
	* - comparator 0 matches any address, as long as rangein is low */
	embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK], 0xffffffff);
	embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK], 0xffffffff);
1598
1599
	embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], EICE_W_CTRL_ENABLE);
	embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK], ~(EICE_W_CTRL_RANGE|EICE_W_CTRL_nOPC) & 0xff);
1600
1601
1602
1603
	embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W1_ADDR_VALUE], buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32));
	embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W1_ADDR_MASK], 0);
	embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W1_DATA_MASK], 0xffffffff);
	embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_VALUE], 0x0);
1604
	embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_MASK], ~EICE_W_CTRL_nOPC & 0xff);
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
}

void arm7_9_disable_eice_step(target_t *target)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;

	embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK]);
	embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK]);
	embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE]);
	embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK]);
	embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W1_ADDR_VALUE]);
	embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W1_ADDR_MASK]);
	embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W1_DATA_MASK]);
	embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_MASK]);
	embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W1_CONTROL_VALUE]);
}

int arm7_9_step(struct target_s *target, int current, u32 address, int handle_breakpoints)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
1627
	breakpoint_t *breakpoint = NULL;
1628
	int err;
1629
1630
1631

	if (target->state != TARGET_HALTED)
	{
1632
		LOG_WARNING("target not halted");
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
		return ERROR_TARGET_NOT_HALTED;
	}
	
	/* current = 1: continue on current pc, otherwise continue at <address> */
	if (!current)
		buf_set_u32(armv4_5->core_cache->reg_list[15].value, 0, 32, address);
	
	/* the front-end may request us not to handle breakpoints */
	if (handle_breakpoints)
		if ((breakpoint = breakpoint_find(target, buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32))))
			arm7_9_unset_breakpoint(target, breakpoint);
	
	target->debug_reason = DBG_REASON_SINGLESTEP;

	arm7_9_restore_context(target);
	
	arm7_9->enable_single_step(target);
	
	if (armv4_5->core_state == ARMV4_5_STATE_ARM)
	{
		arm7_9->branch_resume(target);
	}
	else if (armv4_5->core_state == ARMV4_5_STATE_THUMB)
	{
		arm7_9->branch_resume_thumb(target);
	}
	else
	{
1661
		LOG_ERROR("unhandled core state");
1662
		return ERROR_FAIL;
1663
1664
1665
1666
	}
	
	target_call_event_callbacks(target, TARGET_EVENT_RESUMED);

1667
	err = arm7_9_execute_sys_speed(target);
1668
1669
1670
1671
1672
	arm7_9->disable_single_step(target);
	
	/* registers are now invalid */
	armv4_5_invalidate_core_regs(target);
	
1673
1674
1675
1676
1677
1678
	if (err != ERROR_OK)
	{
		target->state = TARGET_UNKNOWN;
	} else {
		arm7_9_debug_entry(target);
		target_call_event_callbacks(target, TARGET_EVENT_HALTED);
1679
		LOG_DEBUG("target stepped");
1680
	}
1681
1682
1683
1684
	
	if (breakpoint)
		arm7_9_set_breakpoint(target, breakpoint);
	
1685
	return err;
1686
1687
1688
1689
1690
1691

}

int arm7_9_read_core_reg(struct target_s *target, int num, enum armv4_5_mode mode)
{
	u32* reg_p[16];
1692
	u32 value;
1693
1694
1695
	int retval;
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
1696
1697
1698
1699
	
	if (armv4_5_mode_to_number(armv4_5->core_mode)==-1)
		return ERROR_FAIL;
	
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
	enum armv4_5_mode reg_mode = ((armv4_5_core_reg_t*)ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, mode, num).arch_info)->mode;
	
	if ((num < 0) || (num > 16))
		return ERROR_INVALID_ARGUMENTS;
	
	if ((mode != ARMV4_5_MODE_ANY)
			&& (mode != armv4_5->core_mode)
			&& (reg_mode != ARMV4_5_MODE_ANY))
	{
		u32 tmp_cpsr;
			
1711
		/* change processor mode (mask T bit) */
1712
1713
		tmp_cpsr = buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 8) & 0xE0;
		tmp_cpsr |= mode;
1714
		tmp_cpsr &= ~0x20;
1715
1716
1717
1718
1719
1720
		arm7_9->write_xpsr_im8(target, tmp_cpsr & 0xff, 0, 0);
	}
	
	if ((num >= 0) && (num <= 15))
	{
		/* read a normal core register */
1721
		reg_p[num] = &value;
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
		
		arm7_9->read_core_regs(target, 1 << num, reg_p);
	}
	else
	{
		/* read a program status register
		 * if the register mode is MODE_ANY, we read the cpsr, otherwise a spsr
		 */
		armv4_5_core_reg_t *arch_info = ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, mode, num).arch_info;
		int spsr = (arch_info->mode == ARMV4_5_MODE_ANY) ? 0 : 1;
		
1733
		arm7_9->read_xpsr(target, &value, spsr);
1734
1735
	}
	
1736
1737
	if ((retval = jtag_execute_queue()) != ERROR_OK)
	{
1738
		return retval;
1739
1740
	}
		
1741
1742
	ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, mode, num).valid = 1;
	ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, mode, num).dirty = 0;
1743
	buf_set_u32(ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, mode, num).value, 0, 32, value);
1744
1745
1746
1747
		
	if ((mode != ARMV4_5_MODE_ANY)
			&& (mode != armv4_5->core_mode)
			&& (reg_mode != ARMV4_5_MODE_ANY))	{
1748
1749
		/* restore processor mode (mask T bit) */
		arm7_9->write_xpsr_im8(target, buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 8) & ~0x20, 0, 0);
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
	}
	
	return ERROR_OK;
	
}

int arm7_9_write_core_reg(struct target_s *target, int num, enum armv4_5_mode mode, u32 value)
{
	u32 reg[16];
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
1761
1762
1763
1764
	
	if (armv4_5_mode_to_number(armv4_5->core_mode)==-1)
		return ERROR_FAIL;
	
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
	enum armv4_5_mode reg_mode = ((armv4_5_core_reg_t*)ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, mode, num).arch_info)->mode;

	if ((num < 0) || (num > 16))
		return ERROR_INVALID_ARGUMENTS;
	
	if ((mode != ARMV4_5_MODE_ANY)
			&& (mode != armv4_5->core_mode)
			&& (reg_mode != ARMV4_5_MODE_ANY))	{
		u32 tmp_cpsr;
			
1775
		/* change processor mode (mask T bit) */
1776
1777
		tmp_cpsr = buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 8) & 0xE0;
		tmp_cpsr |= mode;
1778
		tmp_cpsr &= ~0x20;
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
		arm7_9->write_xpsr_im8(target, tmp_cpsr & 0xff, 0, 0);
	}
	
	if ((num >= 0) && (num <= 15))
	{
		/* write a normal core register */
		reg[num] = value;
		
		arm7_9->write_core_regs(target, 1 << num, reg);
	}
	else
	{
		/* write a program status register
		* if the register mode is MODE_ANY, we write the cpsr, otherwise a spsr
		*/
		armv4_5_core_reg_t *arch_info = ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, mode, num).arch_info;
		int spsr = (arch_info->mode == ARMV4_5_MODE_ANY) ? 0 : 1;
		
1797
1798
1799
1800
		/* if we're writing the CPSR, mask the T bit */
		if (!spsr)
			value &= ~0x20;
		
1801
1802
1803
1804
1805
1806
1807
1808
1809
		arm7_9->write_xpsr(target, value, spsr);
	}
	
	ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, mode, num).valid = 1;
	ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, mode, num).dirty = 0;
		
	if ((mode != ARMV4_5_MODE_ANY)
			&& (mode != armv4_5->core_mode)
			&& (reg_mode != ARMV4_5_MODE_ANY))	{
1810
1811
		/* restore processor mode (mask T bit) */
		arm7_9->write_xpsr_im8(target, buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 8) & ~0x20, 0, 0);
1812
1813
	}
	
1814
	return jtag_execute_queue();
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
}

int arm7_9_read_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
	
	u32 reg[16];
	int num_accesses = 0;
	int thisrun_accesses;
	int i;
	u32 cpsr;
	int retval;
	int last_reg = 0;
1829
	
1830
	LOG_DEBUG("address: 0x%8.8x, size: 0x%8.8x, count: 0x%8.8x", address, size, count);
1831
1832
1833

	if (target->state != TARGET_HALTED)
	{
1834
		LOG_WARNING("target not halted");
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
		return ERROR_TARGET_NOT_HALTED;
	}

	/* sanitize arguments */
	if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
		return ERROR_INVALID_ARGUMENTS;

	if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
		return ERROR_TARGET_UNALIGNED_ACCESS;
	
	/* load the base register with the address of the first word */
	reg[0] = address;
	arm7_9->write_core_regs(target, 0x1, reg);
	
	switch (size)
	{
		case 4:
			while (num_accesses < count)
			{
				u32 reg_list;
				thisrun_accesses = ((count - num_accesses) >= 14) ? 14 : (count - num_accesses);
				reg_list = (0xffff >> (15 - thisrun_accesses)) & 0xfffe;
				
1858
1859
1860
				if (last_reg <= thisrun_accesses)
					last_reg = thisrun_accesses;
				
1861
1862
				arm7_9->load_word_regs(target, reg_list);
				
1863
1864
1865
1866
1867
1868
1869
1870
1871
				/* fast memory reads are only safe when the target is running
				 * from a sufficiently high clock (32 kHz is usually too slow)
				 */
				if (arm7_9->fast_memory_access)
					arm7_9_execute_fast_sys_speed(target);
				else
					arm7_9_execute_sys_speed(target);
									
				arm7_9->read_core_regs_target_buffer(target, reg_list, buffer, 4);
1872
				
1873
1874
				/* advance buffer, count number of accesses */
				buffer += thisrun_accesses * 4;
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
				num_accesses += thisrun_accesses;
			}	
			break;
		case 2:
			while (num_accesses < count)
			{
				u32 reg_list;
				thisrun_accesses = ((count - num_accesses) >= 14) ? 14 : (count - num_accesses);
				reg_list = (0xffff >> (15 - thisrun_accesses)) & 0xfffe;
				
				for (i = 1; i <= thisrun_accesses; i++)
				{
					if (i > last_reg)
						last_reg = i;
					arm7_9->load_hword_reg(target, i);
1890
1891
1892
1893
1894
1895
1896
					/* fast memory reads are only safe when the target is running
					 * from a sufficiently high clock (32 kHz is usually too slow)
					 */
					if (arm7_9->fast_memory_access)
						arm7_9_execute_fast_sys_speed(target);
					else
						arm7_9_execute_sys_speed(target);
1897
1898
				}
				
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				arm7_9->read_core_regs_target_buffer(target, reg_list, buffer, 2);
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				/* advance buffer, count number of accesses */
				buffer += thisrun_accesses * 2;
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				num_accesses += thisrun_accesses;
			}	
			break;
		case 1:
			while (num_accesses < count)
			{
				u32 reg_list;
				thisrun_accesses = ((count - num_accesses) >= 14) ? 14 : (count - num_accesses);
				reg_list = (0xffff >> (15 - thisrun_accesses)) & 0xfffe;
				
				for (i = 1; i <= thisrun_accesses; i++)
				{
					if (i > last_reg)
						last_reg = i;
					arm7_9->load_byte_reg(target, i);
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					/* fast memory reads are only safe when the target is running
					 * from a sufficiently high clock (32 kHz is usually too slow)
					 */
					if (arm7_9->fast_memory_access)
						arm7_9_execute_fast_sys_speed(target);
					else
						arm7_9_execute_sys_speed(target);
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				}
				
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				arm7_9->read_core_regs_target_buffer(target, reg_list, buffer, 1);
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				/* advance buffer, count number of accesses */
				buffer += thisrun_accesses * 1;
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				num_accesses += thisrun_accesses;
			}	
			break;
		default:
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			LOG_ERROR("BUG: we shouldn't get here");
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			exit(-1);
			break;
	}
	
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	if (armv4_5_mode_to_number(armv4_5->core_mode)==-1)
		return ERROR_FAIL;

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	for (i=0; i<=last_reg; i++)
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		ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, i).dirty = ARMV4_5_CORE_REG_MODE(armv4_5->core_cache, armv4_5->core_mode, i).valid;
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	arm7_9->read_xpsr(target, &cpsr, 0);
	if ((retval = jtag_execute_queue()) != ERROR_OK)
	{
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		LOG_ERROR("JTAG error while reading cpsr");
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		return ERROR_TARGET_DATA_ABORT;
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	}

	if (((cpsr & 0x1f) == ARMV4_5_MODE_ABT) && (armv4_5->core_mode != ARMV4_5_MODE_ABT))
	{
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		LOG_WARNING("memory read caused data abort (address: 0x%8.8x, size: 0x%x, count: 0x%x)", address, size, count);
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		arm7_9->write_xpsr_im8(target, buf_get_u32(armv4_5->core_cache->reg_list[ARMV4_5_CPSR].value, 0, 8) & ~0x20, 0, 0);
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		return ERROR_TARGET_DATA_ABORT;
	}
	
	return ERROR_OK;
}

int arm7_9_write_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer)
{
	armv4_5_common_t *armv4_5 = target->arch_info;
	arm7_9_common_t *arm7_9 = armv4_5->arch_info;
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	reg_t *dbg_ctrl = &arm7_9->eice_cache->reg_list[EICE_DBG_CTRL];
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	u32 reg[16];
	int num_accesses = 0;
	int thisrun_accesses;
	int i;
	u32 cpsr;
	int retval;
	int last_reg = 0;

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#ifdef _DEBUG_ARM7_9_
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	LOG_DEBUG("address: 0x%8.8x, size: 0x%8.8x, count: 0x%8.8x", address, size, count);
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#endif
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	if (target->state != TARGET_HALTED)
	{
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		LOG_WARNING("target not halted");
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		return ERROR_TARGET_NOT_HALTED;
	}

	/* sanitize arguments */
	if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
		return ERROR_INVALID_ARGUMENTS;

	if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
		return ERROR_TARGET_UNALIGNED_ACCESS;
	
	/* load the base register with the address of the first word */
	reg[0] = address;
	arm7_9->write_core_regs(target, 0x1, reg);
	
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	/* Clear DBGACK, to make sure memory fetches work as expected */
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