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-rw-r--r--target/cris/helper.c319
1 files changed, 319 insertions, 0 deletions
diff --git a/target/cris/helper.c b/target/cris/helper.c
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--- /dev/null
+++ b/target/cris/helper.c
@@ -0,0 +1,319 @@
+/*
+ * 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 "qemu/osdep.h"
+#include "cpu.h"
+#include "mmu.h"
+#include "qemu/host-utils.h"
+#include "exec/exec-all.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;
+
+ qemu_log_mask(CPU_LOG_MMU, "%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) {
+ qemu_log_mask(CPU_LOG_MMU,
+ "%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;
+}
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