target-cris/helper.c - qemu - Git at Google

 /*
  *  CRIS helper routines.
  *
  *  Copyright (c) 2007 AXIS Communications AB
  *  Written by Edgar E. Iglesias.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */

 #include "cpu.h"
 #include "mmu.h"
 #include "host-utils.h"


 //#define CRIS_HELPER_DEBUG


 #ifdef CRIS_HELPER_DEBUG
 #define D(x) x
 #define D_LOG(...) qemu_log(__VA__ARGS__)
 #else
 #define D(x)
 #define D_LOG(...) do { } while (0)
 #endif

 #if defined(CONFIG_USER_ONLY)

 void do_interrupt (CPUCRISState *env)
 {
 	env->exception_index = -1;
 	env->pregs[PR_ERP] = env->pc;
 }

 int cpu_cris_handle_mmu_fault(CPUCRISState * env, target_ulong address, int rw,
                               int mmu_idx)
 {
 	env->exception_index = 0xaa;
 	env->pregs[PR_EDA] = address;
 	cpu_dump_state(env, stderr, fprintf, 0);
 	return 1;
 }

 #else /* !CONFIG_USER_ONLY */


 static void cris_shift_ccs(CPUCRISState *env)
 {
 	uint32_t ccs;
 	/* Apply the ccs shift.  */
 	ccs = env->pregs[PR_CCS];
 	ccs = ((ccs & 0xc0000000) | ((ccs << 12) >> 2)) & ~0x3ff;
 	env->pregs[PR_CCS] = ccs;
 }

 int cpu_cris_handle_mmu_fault (CPUCRISState *env, target_ulong address, int rw,
                                int mmu_idx)
 {
 	struct cris_mmu_result res;
 	int prot, miss;
 	int r = -1;
 	target_ulong phy;

 	D(printf ("%s addr=%x pc=%x rw=%x\n", __func__, address, env->pc, rw));
 	miss = cris_mmu_translate(&res, env, address & TARGET_PAGE_MASK,
 				  rw, mmu_idx, 0);
 	if (miss)
 	{
 		if (env->exception_index == EXCP_BUSFAULT)
 			cpu_abort(env,
 				  "CRIS: Illegal recursive bus fault."
 				 "addr=%x rw=%d\n",
 				 address, rw);

 		env->pregs[PR_EDA] = address;
 		env->exception_index = EXCP_BUSFAULT;
 		env->fault_vector = res.bf_vec;
 		r = 1;
 	}
 	else
 	{
 		/*
 		 * Mask off the cache selection bit. The ETRAX busses do not
 		 * see the top bit.
 		 */
 		phy = res.phy & ~0x80000000;
 		prot = res.prot;
 		tlb_set_page(env, address & TARGET_PAGE_MASK, phy,
                              prot, mmu_idx, TARGET_PAGE_SIZE);
                 r = 0;
 	}
 	if (r > 0)
             D_LOG("%s returns %d irqreq=%x addr=%x phy=%x vec=%x pc=%x\n",
                   __func__, r, env->interrupt_request, address, res.phy,
                   res.bf_vec, env->pc);
 	return r;
 }

 static void do_interruptv10(CPUCRISState *env)
 {
 	int ex_vec = -1;

 	D_LOG( "exception index=%d interrupt_req=%d\n",
 		   env->exception_index,
 		   env->interrupt_request);

 	assert(!(env->pregs[PR_CCS] & PFIX_FLAG));
 	switch (env->exception_index)
 	{
 		case EXCP_BREAK:
 			/* These exceptions are genereated by the core itself.
 			   ERP should point to the insn following the brk.  */
 			ex_vec = env->trap_vector;
 			env->pregs[PR_ERP] = env->pc;
 			break;

 		case EXCP_NMI:
 			/* NMI is hardwired to vector zero.  */
 			ex_vec = 0;
 			env->pregs[PR_CCS] &= ~M_FLAG;
 			env->pregs[PR_NRP] = env->pc;
 			break;

 		case EXCP_BUSFAULT:
                         cpu_abort(env, "Unhandled busfault");
 			break;

 		default:
 			/* The interrupt controller gives us the vector.  */
 			ex_vec = env->interrupt_vector;
 			/* Normal interrupts are taken between
 			   TB's.  env->pc is valid here.  */
 			env->pregs[PR_ERP] = env->pc;
 			break;
 	}

 	if (env->pregs[PR_CCS] & U_FLAG) {
 		/* Swap stack pointers.  */
 		env->pregs[PR_USP] = env->regs[R_SP];
 		env->regs[R_SP] = env->ksp;
 	}

 	/* Now that we are in kernel mode, load the handlers address.  */
 	env->pc = ldl_code(env->pregs[PR_EBP] + ex_vec * 4);
 	env->locked_irq = 1;
 	env->pregs[PR_CCS] |= F_FLAG_V10; /* set F.  */

 	qemu_log_mask(CPU_LOG_INT, "%s isr=%x vec=%x ccs=%x pid=%d erp=%x\n",
 		      __func__, env->pc, ex_vec,
 		      env->pregs[PR_CCS],
 		      env->pregs[PR_PID],
 		      env->pregs[PR_ERP]);
 }

 void do_interrupt(CPUCRISState *env)
 {
 	int ex_vec = -1;

 	if (env->pregs[PR_VR] < 32)
 		return do_interruptv10(env);

 	D_LOG( "exception index=%d interrupt_req=%d\n",
 		   env->exception_index,
 		   env->interrupt_request);

 	switch (env->exception_index)
 	{
 		case EXCP_BREAK:
 			/* These exceptions are genereated by the core itself.
 			   ERP should point to the insn following the brk.  */
 			ex_vec = env->trap_vector;
 			env->pregs[PR_ERP] = env->pc;
 			break;

 		case EXCP_NMI:
 			/* NMI is hardwired to vector zero.  */
 			ex_vec = 0;
 			env->pregs[PR_CCS] &= ~M_FLAG;
 			env->pregs[PR_NRP] = env->pc;
 			break;

 		case EXCP_BUSFAULT:
 			ex_vec = env->fault_vector;
 			env->pregs[PR_ERP] = env->pc;
 			break;

 		default:
 			/* The interrupt controller gives us the vector.  */
 			ex_vec = env->interrupt_vector;
 			/* Normal interrupts are taken between
 			   TB's.  env->pc is valid here.  */
 			env->pregs[PR_ERP] = env->pc;
 			break;
 	}

 	/* Fill in the IDX field.  */
 	env->pregs[PR_EXS] = (ex_vec & 0xff) << 8;

 	if (env->dslot) {
 		D_LOG("excp isr=%x PC=%x ds=%d SP=%x"
 			  " ERP=%x pid=%x ccs=%x cc=%d %x\n",
 			  ex_vec, env->pc, env->dslot,
 			  env->regs[R_SP],
 			  env->pregs[PR_ERP], env->pregs[PR_PID],
 			  env->pregs[PR_CCS],
 			  env->cc_op, env->cc_mask);
 		/* We loose the btarget, btaken state here so rexec the
 		   branch.  */
 		env->pregs[PR_ERP] -= env->dslot;
 		/* Exception starts with dslot cleared.  */
 		env->dslot = 0;
 	}

 	if (env->pregs[PR_CCS] & U_FLAG) {
 		/* Swap stack pointers.  */
 		env->pregs[PR_USP] = env->regs[R_SP];
 		env->regs[R_SP] = env->ksp;
 	}

 	/* Apply the CRIS CCS shift. Clears U if set.  */
 	cris_shift_ccs(env);

 	/* Now that we are in kernel mode, load the handlers address.
 	   This load may not fault, real hw leaves that behaviour as
 	   undefined.  */
 	env->pc = ldl_code(env->pregs[PR_EBP] + ex_vec * 4);

 	/* Clear the excption_index to avoid spurios hw_aborts for recursive
 	   bus faults.  */
 	env->exception_index = -1;

 	D_LOG("%s isr=%x vec=%x ccs=%x pid=%d erp=%x\n",
 		   __func__, env->pc, ex_vec,
 		   env->pregs[PR_CCS],
 		   env->pregs[PR_PID],
 		   env->pregs[PR_ERP]);
 }

 target_phys_addr_t cpu_get_phys_page_debug(CPUCRISState * env, target_ulong addr)
 {
 	uint32_t phy = addr;
 	struct cris_mmu_result res;
 	int miss;

 	miss = cris_mmu_translate(&res, env, addr, 0, 0, 1);
 	/* If D TLB misses, try I TLB.  */
 	if (miss) {
 		miss = cris_mmu_translate(&res, env, addr, 2, 0, 1);
 	}

 	if (!miss)
 		phy = res.phy;
 	D(fprintf(stderr, "%s %x -> %x\n", __func__, addr, phy));
 	return phy;
 }
 #endif
	/*
	* CRIS helper routines.
	*
	* Copyright (c) 2007 AXIS Communications AB
	* Written by Edgar E. Iglesias.
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this library; if not, see <http://www.gnu.org/licenses/>.
	*/

	#include "cpu.h"
	#include "mmu.h"
	#include "host-utils.h"


	//#define CRIS_HELPER_DEBUG


	#ifdef CRIS_HELPER_DEBUG
	#define D(x) x
	#define D_LOG(...) qemu_log(__VA__ARGS__)
	#else
	#define D(x)
	#define D_LOG(...) do { } while (0)
	#endif

	#if defined(CONFIG_USER_ONLY)

	void do_interrupt (CPUCRISState *env)
	{
	env->exception_index = -1;
	env->pregs[PR_ERP] = env->pc;
	}

	int cpu_cris_handle_mmu_fault(CPUCRISState * env, target_ulong address, int rw,
	int mmu_idx)
	{
	env->exception_index = 0xaa;
	env->pregs[PR_EDA] = address;
	cpu_dump_state(env, stderr, fprintf, 0);
	return 1;
	}

	#else /* !CONFIG_USER_ONLY */


	static void cris_shift_ccs(CPUCRISState *env)
	{
	uint32_t ccs;
	/* Apply the ccs shift. */
	ccs = env->pregs[PR_CCS];
	ccs = ((ccs & 0xc0000000) \| ((ccs << 12) >> 2)) & ~0x3ff;
	env->pregs[PR_CCS] = ccs;
	}

	int cpu_cris_handle_mmu_fault (CPUCRISState *env, target_ulong address, int rw,
	int mmu_idx)
	{
	struct cris_mmu_result res;
	int prot, miss;
	int r = -1;
	target_ulong phy;

	D(printf ("%s addr=%x pc=%x rw=%x\n", __func__, address, env->pc, rw));
	miss = cris_mmu_translate(&res, env, address & TARGET_PAGE_MASK,
	rw, mmu_idx, 0);
	if (miss)
	{
	if (env->exception_index == EXCP_BUSFAULT)
	cpu_abort(env,
	"CRIS: Illegal recursive bus fault."
	"addr=%x rw=%d\n",
	address, rw);

	env->pregs[PR_EDA] = address;
	env->exception_index = EXCP_BUSFAULT;
	env->fault_vector = res.bf_vec;
	r = 1;
	}
	else
	{
	/*
	* Mask off the cache selection bit. The ETRAX busses do not
	* see the top bit.
	*/
	phy = res.phy & ~0x80000000;
	prot = res.prot;
	tlb_set_page(env, address & TARGET_PAGE_MASK, phy,
	prot, mmu_idx, TARGET_PAGE_SIZE);
	r = 0;
	}
	if (r > 0)
	D_LOG("%s returns %d irqreq=%x addr=%x phy=%x vec=%x pc=%x\n",
	__func__, r, env->interrupt_request, address, res.phy,
	res.bf_vec, env->pc);
	return r;
	}

	static void do_interruptv10(CPUCRISState *env)
	{
	int ex_vec = -1;

	D_LOG( "exception index=%d interrupt_req=%d\n",
	env->exception_index,
	env->interrupt_request);

	assert(!(env->pregs[PR_CCS] & PFIX_FLAG));
	switch (env->exception_index)
	{
	case EXCP_BREAK:
	/* These exceptions are genereated by the core itself.
	ERP should point to the insn following the brk. */
	ex_vec = env->trap_vector;
	env->pregs[PR_ERP] = env->pc;
	break;

	case EXCP_NMI:
	/* NMI is hardwired to vector zero. */
	ex_vec = 0;
	env->pregs[PR_CCS] &= ~M_FLAG;
	env->pregs[PR_NRP] = env->pc;
	break;

	case EXCP_BUSFAULT:
	cpu_abort(env, "Unhandled busfault");
	break;

	default:
	/* The interrupt controller gives us the vector. */
	ex_vec = env->interrupt_vector;
	/* Normal interrupts are taken between
	TB's. env->pc is valid here. */
	env->pregs[PR_ERP] = env->pc;
	break;
	}

	if (env->pregs[PR_CCS] & U_FLAG) {
	/* Swap stack pointers. */
	env->pregs[PR_USP] = env->regs[R_SP];
	env->regs[R_SP] = env->ksp;
	}

	/* Now that we are in kernel mode, load the handlers address. */
	env->pc = ldl_code(env->pregs[PR_EBP] + ex_vec * 4);
	env->locked_irq = 1;
	env->pregs[PR_CCS] \|= F_FLAG_V10; /* set F. */

	qemu_log_mask(CPU_LOG_INT, "%s isr=%x vec=%x ccs=%x pid=%d erp=%x\n",
	__func__, env->pc, ex_vec,
	env->pregs[PR_CCS],
	env->pregs[PR_PID],
	env->pregs[PR_ERP]);
	}

	void do_interrupt(CPUCRISState *env)
	{
	int ex_vec = -1;

	if (env->pregs[PR_VR] < 32)
	return do_interruptv10(env);

	D_LOG( "exception index=%d interrupt_req=%d\n",
	env->exception_index,
	env->interrupt_request);

	switch (env->exception_index)
	{
	case EXCP_BREAK:
	/* These exceptions are genereated by the core itself.
	ERP should point to the insn following the brk. */
	ex_vec = env->trap_vector;
	env->pregs[PR_ERP] = env->pc;
	break;

	case EXCP_NMI:
	/* NMI is hardwired to vector zero. */
	ex_vec = 0;
	env->pregs[PR_CCS] &= ~M_FLAG;
	env->pregs[PR_NRP] = env->pc;
	break;

	case EXCP_BUSFAULT:
	ex_vec = env->fault_vector;
	env->pregs[PR_ERP] = env->pc;
	break;

	default:
	/* The interrupt controller gives us the vector. */
	ex_vec = env->interrupt_vector;
	/* Normal interrupts are taken between
	TB's. env->pc is valid here. */
	env->pregs[PR_ERP] = env->pc;
	break;
	}

	/* Fill in the IDX field. */
	env->pregs[PR_EXS] = (ex_vec & 0xff) << 8;

	if (env->dslot) {
	D_LOG("excp isr=%x PC=%x ds=%d SP=%x"
	" ERP=%x pid=%x ccs=%x cc=%d %x\n",
	ex_vec, env->pc, env->dslot,
	env->regs[R_SP],
	env->pregs[PR_ERP], env->pregs[PR_PID],
	env->pregs[PR_CCS],
	env->cc_op, env->cc_mask);
	/* We loose the btarget, btaken state here so rexec the
	branch. */
	env->pregs[PR_ERP] -= env->dslot;
	/* Exception starts with dslot cleared. */
	env->dslot = 0;
	}

	if (env->pregs[PR_CCS] & U_FLAG) {
	/* Swap stack pointers. */
	env->pregs[PR_USP] = env->regs[R_SP];
	env->regs[R_SP] = env->ksp;
	}

	/* Apply the CRIS CCS shift. Clears U if set. */
	cris_shift_ccs(env);

	/* Now that we are in kernel mode, load the handlers address.
	This load may not fault, real hw leaves that behaviour as
	undefined. */
	env->pc = ldl_code(env->pregs[PR_EBP] + ex_vec * 4);

	/* Clear the excption_index to avoid spurios hw_aborts for recursive
	bus faults. */
	env->exception_index = -1;

	D_LOG("%s isr=%x vec=%x ccs=%x pid=%d erp=%x\n",
	__func__, env->pc, ex_vec,
	env->pregs[PR_CCS],
	env->pregs[PR_PID],
	env->pregs[PR_ERP]);
	}

	target_phys_addr_t cpu_get_phys_page_debug(CPUCRISState * env, target_ulong addr)
	{
	uint32_t phy = addr;
	struct cris_mmu_result res;
	int miss;

	miss = cris_mmu_translate(&res, env, addr, 0, 0, 1);
	/* If D TLB misses, try I TLB. */
	if (miss) {
	miss = cris_mmu_translate(&res, env, addr, 2, 0, 1);
	}

	if (!miss)
	phy = res.phy;
	D(fprintf(stderr, "%s %x -> %x\n", __func__, addr, phy));
	return phy;
	}
	#endif