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-rw-r--r--target-microblaze/helper.c255
1 files changed, 255 insertions, 0 deletions
diff --git a/target-microblaze/helper.c b/target-microblaze/helper.c
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--- /dev/null
+++ b/target-microblaze/helper.c
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+/*
+ * MicroBlaze helper routines.
+ *
+ * Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+#include "config.h"
+#include "cpu.h"
+#include "exec-all.h"
+#include "host-utils.h"
+
+#define D(x)
+#define DMMU(x)
+
+#if defined(CONFIG_USER_ONLY)
+
+void do_interrupt (CPUState *env)
+{
+ env->exception_index = -1;
+ env->regs[14] = env->sregs[SR_PC];
+}
+
+int cpu_mb_handle_mmu_fault(CPUState * env, target_ulong address, int rw,
+ int mmu_idx, int is_softmmu)
+{
+ env->exception_index = 0xaa;
+ cpu_dump_state(env, stderr, fprintf, 0);
+ return 1;
+}
+
+target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
+{
+ return addr;
+}
+
+#else /* !CONFIG_USER_ONLY */
+
+int cpu_mb_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
+ int mmu_idx, int is_softmmu)
+{
+ unsigned int hit;
+ unsigned int mmu_available;
+ int r = 1;
+ int prot;
+
+ mmu_available = 0;
+ if (env->pvr.regs[0] & PVR0_USE_MMU) {
+ mmu_available = 1;
+ if ((env->pvr.regs[0] & PVR0_PVR_FULL_MASK)
+ && (env->pvr.regs[11] & PVR11_USE_MMU) != PVR11_USE_MMU) {
+ mmu_available = 0;
+ }
+ }
+
+ /* Translate if the MMU is available and enabled. */
+ if (mmu_available && (env->sregs[SR_MSR] & MSR_VM)) {
+ target_ulong vaddr, paddr;
+ struct microblaze_mmu_lookup lu;
+
+ hit = mmu_translate(&env->mmu, &lu, address, rw, mmu_idx);
+ if (hit) {
+ vaddr = address & TARGET_PAGE_MASK;
+ paddr = lu.paddr + vaddr - lu.vaddr;
+
+ DMMU(qemu_log("MMU map mmu=%d v=%x p=%x prot=%x\n",
+ mmu_idx, vaddr, paddr, lu.prot));
+ r = tlb_set_page(env, vaddr,
+ paddr, lu.prot, mmu_idx, is_softmmu);
+ } else {
+ env->sregs[SR_EAR] = address;
+ DMMU(qemu_log("mmu=%d miss addr=%x\n", mmu_idx, vaddr));
+
+ switch (lu.err) {
+ case ERR_PROT:
+ env->sregs[SR_ESR] = rw == 2 ? 17 : 16;
+ env->sregs[SR_ESR] |= (rw == 1) << 10;
+ break;
+ case ERR_MISS:
+ env->sregs[SR_ESR] = rw == 2 ? 19 : 18;
+ env->sregs[SR_ESR] |= (rw == 1) << 10;
+ break;
+ default:
+ abort();
+ break;
+ }
+
+ if (env->exception_index == EXCP_MMU) {
+ cpu_abort(env, "recursive faults\n");
+ }
+
+ /* TLB miss. */
+ env->exception_index = EXCP_MMU;
+ }
+ } else {
+ /* MMU disabled or not available. */
+ address &= TARGET_PAGE_MASK;
+ prot = PAGE_BITS;
+ r = tlb_set_page(env, address, address, prot, mmu_idx, is_softmmu);
+ }
+ return r;
+}
+
+void do_interrupt(CPUState *env)
+{
+ uint32_t t;
+
+ /* IMM flag cannot propagate accross a branch and into the dslot. */
+ assert(!((env->iflags & D_FLAG) && (env->iflags & IMM_FLAG)));
+ assert(!(env->iflags & (DRTI_FLAG | DRTE_FLAG | DRTB_FLAG)));
+/* assert(env->sregs[SR_MSR] & (MSR_EE)); Only for HW exceptions. */
+ switch (env->exception_index) {
+ case EXCP_MMU:
+ env->regs[17] = env->sregs[SR_PC];
+
+ /* Exception breaks branch + dslot sequence? */
+ if (env->iflags & D_FLAG) {
+ D(qemu_log("D_FLAG set at exception bimm=%d\n", env->bimm));
+ env->sregs[SR_ESR] |= 1 << 12 ;
+ env->sregs[SR_BTR] = env->btarget;
+
+ /* Reexecute the branch. */
+ env->regs[17] -= 4;
+ /* was the branch immprefixed?. */
+ if (env->bimm) {
+ qemu_log_mask(CPU_LOG_INT,
+ "bimm exception at pc=%x iflags=%x\n",
+ env->sregs[SR_PC], env->iflags);
+ env->regs[17] -= 4;
+ log_cpu_state_mask(CPU_LOG_INT, env, 0);
+ }
+ } else if (env->iflags & IMM_FLAG) {
+ D(qemu_log("IMM_FLAG set at exception\n"));
+ env->regs[17] -= 4;
+ }
+
+ /* Disable the MMU. */
+ t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
+ env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
+ env->sregs[SR_MSR] |= t;
+ /* Exception in progress. */
+ env->sregs[SR_MSR] |= MSR_EIP;
+
+ qemu_log_mask(CPU_LOG_INT,
+ "exception at pc=%x ear=%x iflags=%x\n",
+ env->sregs[SR_PC], env->sregs[SR_EAR], env->iflags);
+ log_cpu_state_mask(CPU_LOG_INT, env, 0);
+ env->iflags &= ~(IMM_FLAG | D_FLAG);
+ env->sregs[SR_PC] = 0x20;
+ break;
+
+ case EXCP_IRQ:
+ assert(!(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP)));
+ assert(env->sregs[SR_MSR] & MSR_IE);
+ assert(!(env->iflags & D_FLAG));
+
+ t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
+
+#if 0
+#include "disas.h"
+
+/* Useful instrumentation when debugging interrupt issues in either
+ the models or in sw. */
+ {
+ const char *sym;
+
+ sym = lookup_symbol(env->sregs[SR_PC]);
+ if (sym
+ && (!strcmp("netif_rx", sym)
+ || !strcmp("process_backlog", sym))) {
+
+ qemu_log(
+ "interrupt at pc=%x msr=%x %x iflags=%x sym=%s\n",
+ env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags,
+ sym);
+
+ log_cpu_state(env, 0);
+ }
+ }
+#endif
+ qemu_log_mask(CPU_LOG_INT,
+ "interrupt at pc=%x msr=%x %x iflags=%x\n",
+ env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags);
+
+ env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM \
+ | MSR_UM | MSR_IE);
+ env->sregs[SR_MSR] |= t;
+
+ env->regs[14] = env->sregs[SR_PC];
+ env->sregs[SR_PC] = 0x10;
+ //log_cpu_state_mask(CPU_LOG_INT, env, 0);
+ break;
+
+ case EXCP_BREAK:
+ case EXCP_HW_BREAK:
+ assert(!(env->iflags & IMM_FLAG));
+ assert(!(env->iflags & D_FLAG));
+ t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
+ qemu_log_mask(CPU_LOG_INT,
+ "break at pc=%x msr=%x %x iflags=%x\n",
+ env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags);
+ log_cpu_state_mask(CPU_LOG_INT, env, 0);
+ env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
+ env->sregs[SR_MSR] |= t;
+ env->sregs[SR_MSR] |= MSR_BIP;
+ if (env->exception_index == EXCP_HW_BREAK) {
+ env->regs[16] = env->sregs[SR_PC];
+ env->sregs[SR_MSR] |= MSR_BIP;
+ env->sregs[SR_PC] = 0x18;
+ } else
+ env->sregs[SR_PC] = env->btarget;
+ break;
+ default:
+ cpu_abort(env, "unhandled exception type=%d\n",
+ env->exception_index);
+ break;
+ }
+}
+
+target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
+{
+ target_ulong vaddr, paddr = 0;
+ struct microblaze_mmu_lookup lu;
+ unsigned int hit;
+
+ if (env->sregs[SR_MSR] & MSR_VM) {
+ hit = mmu_translate(&env->mmu, &lu, addr, 0, 0);
+ if (hit) {
+ vaddr = addr & TARGET_PAGE_MASK;
+ paddr = lu.paddr + vaddr - lu.vaddr;
+ } else
+ paddr = 0; /* ???. */
+ } else
+ paddr = addr & TARGET_PAGE_MASK;
+
+ return paddr;
+}
+#endif
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