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 "qemu/host-utils.h"
 #include "exec/cpu_ldst.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 cris_cpu_do_interrupt(CPUState *cs)
 {
     CRISCPU *cpu = CRIS_CPU(cs);
     CPUCRISState *env = &cpu->env;

     cs->exception_index = -1;
     env->pregs[PR_ERP] = env->pc;
 }

 void crisv10_cpu_do_interrupt(CPUState *cs)
 {
     cris_cpu_do_interrupt(cs);
 }

 int cris_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
                               int mmu_idx)
 {
     CRISCPU *cpu = CRIS_CPU(cs);

     cs->exception_index = 0xaa;
     cpu->env.pregs[PR_EDA] = address;
     cpu_dump_state(cs, 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 cris_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
                               int mmu_idx)
 {
     CRISCPU *cpu = CRIS_CPU(cs);
     CPUCRISState *env = &cpu->env;
     struct cris_mmu_result res;
     int prot, miss;
     int r = -1;
     target_ulong phy;

     D(printf("%s addr=%" VADDR_PRIx " 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 (cs->exception_index == EXCP_BUSFAULT) {
             cpu_abort(cs,
                       "CRIS: Illegal recursive bus fault."
                       "addr=%" VADDR_PRIx " rw=%d\n",
                       address, rw);
         }

         env->pregs[PR_EDA] = address;
         cs->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(cs, address & TARGET_PAGE_MASK, phy,
                      prot, mmu_idx, TARGET_PAGE_SIZE);
         r = 0;
     }
     if (r > 0) {
         D_LOG("%s returns %d irqreq=%x addr=%" VADDR_PRIx " phy=%x vec=%x"
               " pc=%x\n", __func__, r, cs->interrupt_request, address, res.phy,
               res.bf_vec, env->pc);
     }
     return r;
 }

 void crisv10_cpu_do_interrupt(CPUState *cs)
 {
     CRISCPU *cpu = CRIS_CPU(cs);
     CPUCRISState *env = &cpu->env;
     int ex_vec = -1;

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

     if (env->dslot) {
         /* CRISv10 never takes interrupts while in a delay-slot.  */
         cpu_abort(cs, "CRIS: Interrupt on delay-slot\n");
     }

     assert(!(env->pregs[PR_CCS] & PFIX_FLAG));
     switch (cs->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[PRV10_BRP] = env->pc;
         break;

     case EXCP_NMI:
         /* NMI is hardwired to vector zero.  */
         ex_vec = 0;
         env->pregs[PR_CCS] &= ~M_FLAG_V10;
         env->pregs[PRV10_BRP] = env->pc;
         break;

     case EXCP_BUSFAULT:
         cpu_abort(cs, "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 = cpu_ldl_code(env, 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 cris_cpu_do_interrupt(CPUState *cs)
 {
     CRISCPU *cpu = CRIS_CPU(cs);
     CPUCRISState *env = &cpu->env;
     int ex_vec = -1;

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

     switch (cs->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_V32;
         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 = cpu_ldl_code(env, env->pregs[PR_EBP] + ex_vec * 4);

     /* Clear the excption_index to avoid spurios hw_aborts for recursive
        bus faults.  */
     cs->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]);
 }

 hwaddr cris_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
 {
     CRISCPU *cpu = CRIS_CPU(cs);
     uint32_t phy = addr;
     struct cris_mmu_result res;
     int miss;

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

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

 bool cris_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
 {
     CPUClass *cc = CPU_GET_CLASS(cs);
     CRISCPU *cpu = CRIS_CPU(cs);
     CPUCRISState *env = &cpu->env;
     bool ret = false;

     if (interrupt_request & CPU_INTERRUPT_HARD
         && (env->pregs[PR_CCS] & I_FLAG)
         && !env->locked_irq) {
         cs->exception_index = EXCP_IRQ;
         cc->do_interrupt(cs);
         ret = true;
     }
     if (interrupt_request & CPU_INTERRUPT_NMI) {
         unsigned int m_flag_archval;
         if (env->pregs[PR_VR] < 32) {
             m_flag_archval = M_FLAG_V10;
         } else {
             m_flag_archval = M_FLAG_V32;
         }
         if ((env->pregs[PR_CCS] & m_flag_archval)) {
             cs->exception_index = EXCP_NMI;
             cc->do_interrupt(cs);
             ret = true;
         }
     }

     return ret;
 }
	/*
	* 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 "qemu/host-utils.h"
	#include "exec/cpu_ldst.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 cris_cpu_do_interrupt(CPUState *cs)
	{
	CRISCPU *cpu = CRIS_CPU(cs);
	CPUCRISState *env = &cpu->env;

	cs->exception_index = -1;
	env->pregs[PR_ERP] = env->pc;
	}

	void crisv10_cpu_do_interrupt(CPUState *cs)
	{
	cris_cpu_do_interrupt(cs);
	}

	int cris_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
	int mmu_idx)
	{
	CRISCPU *cpu = CRIS_CPU(cs);

	cs->exception_index = 0xaa;
	cpu->env.pregs[PR_EDA] = address;
	cpu_dump_state(cs, 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 cris_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
	int mmu_idx)
	{
	CRISCPU *cpu = CRIS_CPU(cs);
	CPUCRISState *env = &cpu->env;
	struct cris_mmu_result res;
	int prot, miss;
	int r = -1;
	target_ulong phy;

	D(printf("%s addr=%" VADDR_PRIx " 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 (cs->exception_index == EXCP_BUSFAULT) {
	cpu_abort(cs,
	"CRIS: Illegal recursive bus fault."
	"addr=%" VADDR_PRIx " rw=%d\n",
	address, rw);
	}

	env->pregs[PR_EDA] = address;
	cs->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(cs, address & TARGET_PAGE_MASK, phy,
	prot, mmu_idx, TARGET_PAGE_SIZE);
	r = 0;
	}
	if (r > 0) {
	D_LOG("%s returns %d irqreq=%x addr=%" VADDR_PRIx " phy=%x vec=%x"
	" pc=%x\n", __func__, r, cs->interrupt_request, address, res.phy,
	res.bf_vec, env->pc);
	}
	return r;
	}

	void crisv10_cpu_do_interrupt(CPUState *cs)
	{
	CRISCPU *cpu = CRIS_CPU(cs);
	CPUCRISState *env = &cpu->env;
	int ex_vec = -1;

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

	if (env->dslot) {
	/* CRISv10 never takes interrupts while in a delay-slot. */
	cpu_abort(cs, "CRIS: Interrupt on delay-slot\n");
	}

	assert(!(env->pregs[PR_CCS] & PFIX_FLAG));
	switch (cs->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[PRV10_BRP] = env->pc;
	break;

	case EXCP_NMI:
	/* NMI is hardwired to vector zero. */
	ex_vec = 0;
	env->pregs[PR_CCS] &= ~M_FLAG_V10;
	env->pregs[PRV10_BRP] = env->pc;
	break;

	case EXCP_BUSFAULT:
	cpu_abort(cs, "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 = cpu_ldl_code(env, 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 cris_cpu_do_interrupt(CPUState *cs)
	{
	CRISCPU *cpu = CRIS_CPU(cs);
	CPUCRISState *env = &cpu->env;
	int ex_vec = -1;

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

	switch (cs->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_V32;
	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 = cpu_ldl_code(env, env->pregs[PR_EBP] + ex_vec * 4);

	/* Clear the excption_index to avoid spurios hw_aborts for recursive
	bus faults. */
	cs->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]);
	}

	hwaddr cris_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
	{
	CRISCPU *cpu = CRIS_CPU(cs);
	uint32_t phy = addr;
	struct cris_mmu_result res;
	int miss;

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

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

	bool cris_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
	{
	CPUClass *cc = CPU_GET_CLASS(cs);
	CRISCPU *cpu = CRIS_CPU(cs);
	CPUCRISState *env = &cpu->env;
	bool ret = false;

	if (interrupt_request & CPU_INTERRUPT_HARD
	&& (env->pregs[PR_CCS] & I_FLAG)
	&& !env->locked_irq) {
	cs->exception_index = EXCP_IRQ;
	cc->do_interrupt(cs);
	ret = true;
	}
	if (interrupt_request & CPU_INTERRUPT_NMI) {
	unsigned int m_flag_archval;
	if (env->pregs[PR_VR] < 32) {
	m_flag_archval = M_FLAG_V10;
	} else {
	m_flag_archval = M_FLAG_V32;
	}
	if ((env->pregs[PR_CCS] & m_flag_archval)) {
	cs->exception_index = EXCP_NMI;
	cc->do_interrupt(cs);
	ret = true;
	}
	}

	return ret;
	}