WebSVN – HelenOS – Diff – //branches/dynload/kernel/arch/arm32/src/exception.c



#include <arch/memstr.h>
#include <arch/regutils.h>
#include <interrupt.h>
#include <arch/machine.h>
#include <arch/mm/page_fault.h>
#include <arch/barrier.h>
#include <print.h>
#include <syscall/syscall.h>
 
/** Offset used in calculation of exception handler's relative address.
 *

 
/** Updates specified exception vector to jump to given handler.
 *
 *  Addresses of handlers are stored in memory following exception vectors.
 */
static void install_handler(unsigned handler_addr, unsigned *vector)
{
    /* relative address (related to exc. vector) of the word
     * where handler's address is stored
    */
    volatile uint32_t handler_address_ptr = EXC_VECTORS_SIZE -
        PREFETCH_OFFSET;
   
    /* make it LDR instruction and store at exception vector */
    *vector = handler_address_ptr | LDR_OPCODE;
    smc_coherence(*vector);
   
    /* store handler's address */
    *(vector + EXC_VECTORS) = handler_addr;
 
}
 
/** Low-level Reset Exception handler. */
static void reset_exception_entry(void)
{
    PROCESS_EXCEPTION(EXC_RESET);
}
 
/** Low-level Software Interrupt Exception handler. */
static void swi_exception_entry(void)
{
    PROCESS_EXCEPTION(EXC_SWI);
}
 
/** Low-level Undefined Instruction Exception handler. */
static void undef_instr_exception_entry(void)
{
    PROCESS_EXCEPTION(EXC_UNDEF_INSTR);
}
 
/** Low-level Fast Interrupt Exception handler. */
static void fiq_exception_entry(void)
{
    PROCESS_EXCEPTION(EXC_FIQ);
}
 
/** Low-level Prefetch Abort Exception handler. */
static void prefetch_abort_exception_entry(void)
{
    asm("sub lr, lr, #4");
    PROCESS_EXCEPTION(EXC_PREFETCH_ABORT);
}
 
/** Low-level Data Abort Exception handler. */
static void data_abort_exception_entry(void)
{
    asm("sub lr, lr, #8");
    PROCESS_EXCEPTION(EXC_DATA_ABORT);
}
 

 *
 * CPU is switched to Undefined mode before further interrupt processing
 * because of possible occurence of nested interrupt exception, which
 * would overwrite (and thus spoil) stack pointer.
 */
static void irq_exception_entry(void)
{
    asm("sub lr, lr, #4");
    setup_stack_and_save_regs();
   
    switch_to_irq_servicing_mode();

Rev 2927	Rev 3153
Line 38...	Line 38...
38	#include <arch/memstr.h>	38	#include <arch/memstr.h>
39	#include <arch/regutils.h>	39	#include <arch/regutils.h>
40	#include <interrupt.h>	40	#include <interrupt.h>
41	#include <arch/machine.h>	41	#include <arch/machine.h>
42	#include <arch/mm/page_fault.h>	42	#include <arch/mm/page_fault.h>
-		43	#include <arch/barrier.h>
43	#include <print.h>	44	#include <print.h>
44	#include <syscall/syscall.h>	45	#include <syscall/syscall.h>
45		46
46	/** Offset used in calculation of exception handler's relative address.	47	/** Offset used in calculation of exception handler's relative address.
47	*	48	*
Line 207...	Line 208...
207		208
208	/** Updates specified exception vector to jump to given handler.	209	/** Updates specified exception vector to jump to given handler.
209	*	210	*
210	* Addresses of handlers are stored in memory following exception vectors.	211	* Addresses of handlers are stored in memory following exception vectors.
211	*/	212	*/
212	static void install_handler (unsigned handler_addr, unsigned* vector)	213	static void install_handler(unsigned handler_addr, unsigned *vector)
213	{	214	{
214	/* relative address (related to exc. vector) of the word	215	/* relative address (related to exc. vector) of the word
215	* where handler's address is stored	216	* where handler's address is stored
216	*/	217	*/
217	volatile uint32_t handler_address_ptr = EXC_VECTORS_SIZE -	218	volatile uint32_t handler_address_ptr = EXC_VECTORS_SIZE -
218	PREFETCH_OFFSET;	219	PREFETCH_OFFSET;
219		220
220	/* make it LDR instruction and store at exception vector */	221	/* make it LDR instruction and store at exception vector */
221	*vector = handler_address_ptr \| LDR_OPCODE;	222	*vector = handler_address_ptr \| LDR_OPCODE;
-		223	smc_coherence(*vector);
222		224
223	/* store handler's address */	225	/* store handler's address */
224	*(vector + EXC_VECTORS) = handler_addr;	226	*(vector + EXC_VECTORS) = handler_addr;
225		227
226	}	228	}
227		229
228	/** Low-level Reset Exception handler. */	230	/** Low-level Reset Exception handler. */
229	static void reset_exception_entry()	231	static void reset_exception_entry(void)
230	{	232	{
231	PROCESS_EXCEPTION(EXC_RESET);	233	PROCESS_EXCEPTION(EXC_RESET);
232	}	234	}
233		235
234	/** Low-level Software Interrupt Exception handler. */	236	/** Low-level Software Interrupt Exception handler. */
235	static void swi_exception_entry()	237	static void swi_exception_entry(void)
236	{	238	{
237	PROCESS_EXCEPTION(EXC_SWI);	239	PROCESS_EXCEPTION(EXC_SWI);
238	}	240	}
239		241
240	/** Low-level Undefined Instruction Exception handler. */	242	/** Low-level Undefined Instruction Exception handler. */
241	static void undef_instr_exception_entry()	243	static void undef_instr_exception_entry(void)
242	{	244	{
243	PROCESS_EXCEPTION(EXC_UNDEF_INSTR);	245	PROCESS_EXCEPTION(EXC_UNDEF_INSTR);
244	}	246	}
245		247
246	/** Low-level Fast Interrupt Exception handler. */	248	/** Low-level Fast Interrupt Exception handler. */
247	static void fiq_exception_entry()	249	static void fiq_exception_entry(void)
248	{	250	{
249	PROCESS_EXCEPTION(EXC_FIQ);	251	PROCESS_EXCEPTION(EXC_FIQ);
250	}	252	}
251		253
252	/** Low-level Prefetch Abort Exception handler. */	254	/** Low-level Prefetch Abort Exception handler. */
253	static void prefetch_abort_exception_entry()	255	static void prefetch_abort_exception_entry(void)
254	{	256	{
255	asm("sub lr, lr, #4");	257	asm("sub lr, lr, #4");
256	PROCESS_EXCEPTION(EXC_PREFETCH_ABORT);	258	PROCESS_EXCEPTION(EXC_PREFETCH_ABORT);
257	}	259	}
258		260
259	/** Low-level Data Abort Exception handler. */	261	/** Low-level Data Abort Exception handler. */
260	static void data_abort_exception_entry()	262	static void data_abort_exception_entry(void)
261	{	263	{
262	asm("sub lr, lr, #8");	264	asm("sub lr, lr, #8");
263	PROCESS_EXCEPTION(EXC_DATA_ABORT);	265	PROCESS_EXCEPTION(EXC_DATA_ABORT);
264	}	266	}
265		267
Line 267...	Line 269...
267	*	269	*
268	* CPU is switched to Undefined mode before further interrupt processing	270	* CPU is switched to Undefined mode before further interrupt processing
269	* because of possible occurence of nested interrupt exception, which	271	* because of possible occurence of nested interrupt exception, which
270	* would overwrite (and thus spoil) stack pointer.	272	* would overwrite (and thus spoil) stack pointer.
271	*/	273	*/
272	static void irq_exception_entry()	274	static void irq_exception_entry(void)
273	{	275	{
274	asm("sub lr, lr, #4");	276	asm("sub lr, lr, #4");
275	setup_stack_and_save_regs();	277	setup_stack_and_save_regs();
276		278
277	switch_to_irq_servicing_mode();	279	switch_to_irq_servicing_mode();

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(root)//branches/dynload/kernel/arch/arm32/src/exception.c – Rev 2927 → 3153