The remainder of CRIS CPU emulation files, by Edgar E. Iglesias.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3361 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 173 insertions, 0 deletions

diff --git a/target-cris/helper.c b/target-cris/helper.c
new file mode 100644
index 0000000..3db3bea
--- /dev/null
+++ b/target-cris/helper.c
@@ -0,0 +1,173 @@
+/*
+ *  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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "config.h"
+#include "cpu.h"
+#include "mmu.h"
+#include "exec-all.h"
+
+#if defined(CONFIG_USER_ONLY)
+
+void do_interrupt (CPUState *env)
+{
+  env->exception_index = -1;
+}
+
+int cpu_cris_handle_mmu_fault(CPUState * env, target_ulong address, int rw,
+                             int is_user, int is_softmmu)
+{
+    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;
+}
+
+target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
+{
+    return addr;
+}
+
+#else /* !CONFIG_USER_ONLY */
+
+int cpu_cris_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
+                               int is_user, int is_softmmu)
+{
+	struct cris_mmu_result_t res;
+	int prot, miss;
+	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, is_user);
+	if (miss)
+	{
+		/* handle the miss.  */
+		phy = 0;
+		env->exception_index = EXCP_MMU_MISS;
+	}
+	else
+	{
+		phy = res.phy;
+	}
+//	printf ("a=%x phy=%x\n", address, phy);
+	return tlb_set_page(env, address, phy, prot, is_user, is_softmmu);
+}
+
+
+static void cris_shift_ccs(CPUState *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;
+}
+
+void do_interrupt(CPUState *env)
+{
+	uint32_t ebp, isr;
+	int irqnum;
+
+	fflush(NULL);
+
+#if 0
+	printf ("exception index=%d interrupt_req=%d\n",
+		env->exception_index,
+		env->interrupt_request);
+#endif
+
+	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);
+
+			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);
+			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
+			}
+
+		}
+		break;
+	}
+}
+
+target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
+{
+//	printf ("%s\n", __func__);
+	uint32_t phy = addr;
+	struct cris_mmu_result_t res;
+	int miss;
+	miss = cris_mmu_translate(&res, env, addr, 0, 0);
+	if (!miss)
+		phy = res.phy;
+	return phy;
+}
+#endif