* 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, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
-#include <stdio.h>
-#include <string.h>
-
-#include "config.h"
#include "cpu.h"
#include "mmu.h"
-#include "exec-all.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 (CPUState *env)
+void do_interrupt (CPUCRISState *env)
{
- env->exception_index = -1;
+ env->exception_index = -1;
+ env->pregs[PR_ERP] = env->pc;
}
-int cpu_cris_handle_mmu_fault(CPUState * env, target_ulong address, int rw,
- int mmu_idx, int is_softmmu)
+int cpu_cris_handle_mmu_fault(CPUCRISState * env, target_ulong address, int rw,
+ int mmu_idx)
{
- env->exception_index = 0xaa;
- env->debug1 = address;
- cpu_dump_state(env, stderr, fprintf, 0);
- printf("%s addr=%x env->pc=%x\n", __func__, address, env->pc);
- return 1;
+ env->exception_index = 0xaa;
+ env->pregs[PR_EDA] = address;
+ cpu_dump_state(env, stderr, fprintf, 0);
+ return 1;
}
-target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
+#else /* !CONFIG_USER_ONLY */
+
+
+static void cris_shift_ccs(CPUCRISState *env)
{
- return addr;
+ uint32_t ccs;
+ /* Apply the ccs shift. */
+ ccs = env->pregs[PR_CCS];
+ ccs = ((ccs & 0xc0000000) | ((ccs << 12) >> 2)) & ~0x3ff;
+ env->pregs[PR_CCS] = ccs;
}
-#else /* !CONFIG_USER_ONLY */
-
-int cpu_cris_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
- int mmu_idx, int is_softmmu)
+int cpu_cris_handle_mmu_fault (CPUCRISState *env, target_ulong address, int rw,
+ int mmu_idx)
{
- struct cris_mmu_result_t res;
+ struct cris_mmu_result res;
int prot, miss;
+ int r = -1;
target_ulong phy;
- address &= TARGET_PAGE_MASK;
- prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
-// printf ("%s pc=%x %x w=%d smmu=%d\n", __func__, env->pc, address, rw, is_softmmu);
- miss = cris_mmu_translate(&res, env, address, rw, mmu_idx);
+ 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)
{
- /* handle the miss. */
- phy = 0;
- env->exception_index = EXCP_MMU_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
{
- phy = res.phy;
+ /*
+ * 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;
}
-// printf ("a=%x phy=%x\n", address, phy);
- return tlb_set_page(env, address, phy, prot, mmu_idx, is_softmmu);
+ 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 cris_shift_ccs(CPUState *env)
+static void do_interruptv10(CPUCRISState *env)
{
- uint32_t ccs;
- /* Apply the ccs shift. */
- ccs = env->pregs[SR_CCS];
- ccs = (ccs & 0xc0000000) | ((ccs << 12) >> 2);
-// printf ("ccs=%x %x\n", env->pregs[SR_CCS], ccs);
- env->pregs[SR_CCS] = ccs;
+ 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[PRV10_BRP] = env->pc;
+ break;
+
+ case EXCP_NMI:
+ /* NMI is hardwired to vector zero. */
+ ex_vec = 0;
+ env->pregs[PR_CCS] &= ~M_FLAG;
+ env->pregs[PRV10_BRP] = 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(CPUState *env)
+void do_interrupt(CPUCRISState *env)
{
- uint32_t ebp, isr;
- int irqnum;
+ int ex_vec = -1;
- fflush(NULL);
+ if (env->pregs[PR_VR] < 32)
+ return do_interruptv10(env);
-#if 0
- printf ("exception index=%d interrupt_req=%d\n",
- env->exception_index,
- env->interrupt_request);
-#endif
+ D_LOG( "exception index=%d interrupt_req=%d\n",
+ env->exception_index,
+ env->interrupt_request);
switch (env->exception_index)
{
case EXCP_BREAK:
-// printf ("BREAK! %d\n", env->trapnr);
- irqnum = env->trapnr;
- ebp = env->pregs[SR_EBP];
- isr = ldl_code(ebp + irqnum * 4);
- env->pregs[SR_ERP] = env->pc + 2;
- env->pc = isr;
-
- cris_shift_ccs(env);
+ /* 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_MMU_MISS:
-// printf ("MMU miss\n");
- irqnum = 4;
- ebp = env->pregs[SR_EBP];
- isr = ldl_code(ebp + irqnum * 4);
- env->pregs[SR_ERP] = env->pc;
- env->pc = isr;
- cris_shift_ccs(env);
+
+ case EXCP_BUSFAULT:
+ ex_vec = env->fault_vector;
+ env->pregs[PR_ERP] = env->pc;
break;
default:
- {
- /* Maybe the irq was acked by sw before we got a
- change to take it. */
- if (env->interrupt_request & CPU_INTERRUPT_HARD) {
- if (!env->pending_interrupts)
- return;
- if (!(env->pregs[SR_CCS] & I_FLAG)) {
- return;
- }
-
- irqnum = 31 -
- __builtin_clz(env->pending_interrupts);
- irqnum += 0x30;
- ebp = env->pregs[SR_EBP];
- isr = ldl_code(ebp + irqnum * 4);
- env->pregs[SR_ERP] = env->pc;
- env->pc = isr;
-
- cris_shift_ccs(env);
-#if 0
- printf ("%s ebp=%x %x isr=%x %d"
- " ir=%x pending=%x\n",
- __func__,
- ebp, ebp + irqnum * 4,
- isr, env->exception_index,
- env->interrupt_request,
- env->pending_interrupts);
-#endif
- }
+ /* 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;
+ }
- }
- 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(CPUState * env, target_ulong addr)
+target_phys_addr_t cpu_get_phys_page_debug(CPUCRISState * env, target_ulong addr)
{
-// printf ("%s\n", __func__);
uint32_t phy = addr;
- struct cris_mmu_result_t res;
+ struct cris_mmu_result res;
int miss;
- miss = cris_mmu_translate(&res, env, addr, 0, 0);
+
+ 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
projects / qemu.git / blobdiff