--- /dev/null
+/*
+ * CRIS helper routines
+ *
+ * Copyright (c) 2007 AXIS Communications
+ * 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 "exec/helper-proto.h"
+#include "qemu/host-utils.h"
+#include "exec/cpu_ldst.h"
+
+//#define CRIS_OP_HELPER_DEBUG
+
+
+#ifdef CRIS_OP_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)
+/* Try to fill the TLB and return an exception if error. If retaddr is
+ NULL, it means that the function was called in C code (i.e. not
+ from generated code or from helper.c) */
+void tlb_fill(CPUState *cs, target_ulong addr, int is_write, int mmu_idx,
+ uintptr_t retaddr)
+{
+ CRISCPU *cpu = CRIS_CPU(cs);
+ CPUCRISState *env = &cpu->env;
+ int ret;
+
+ D_LOG("%s pc=%x tpc=%x ra=%p\n", __func__,
+ env->pc, env->pregs[PR_EDA], (void *)retaddr);
+ ret = cris_cpu_handle_mmu_fault(cs, addr, is_write, mmu_idx);
+ if (unlikely(ret)) {
+ if (retaddr) {
+ /* now we have a real cpu fault */
+ if (cpu_restore_state(cs, retaddr)) {
+ /* Evaluate flags after retranslation. */
+ helper_top_evaluate_flags(env);
+ }
+ }
+ cpu_loop_exit(cs);
+ }
+}
+
+#endif
+
+void helper_raise_exception(CPUCRISState *env, uint32_t index)
+{
+ CPUState *cs = CPU(cris_env_get_cpu(env));
+
+ cs->exception_index = index;
+ cpu_loop_exit(cs);
+}
+
+void helper_tlb_flush_pid(CPUCRISState *env, uint32_t pid)
+{
+#if !defined(CONFIG_USER_ONLY)
+ pid &= 0xff;
+ if (pid != (env->pregs[PR_PID] & 0xff))
+ cris_mmu_flush_pid(env, env->pregs[PR_PID]);
+#endif
+}
+
+void helper_spc_write(CPUCRISState *env, uint32_t new_spc)
+{
+#if !defined(CONFIG_USER_ONLY)
+ CRISCPU *cpu = cris_env_get_cpu(env);
+ CPUState *cs = CPU(cpu);
+
+ tlb_flush_page(cs, env->pregs[PR_SPC]);
+ tlb_flush_page(cs, new_spc);
+#endif
+}
+
+void helper_dump(uint32_t a0, uint32_t a1, uint32_t a2)
+{
+ qemu_log("%s: a0=%x a1=%x\n", __func__, a0, a1);
+}
+
+/* Used by the tlb decoder. */
+#define EXTRACT_FIELD(src, start, end) \
+ (((src) >> start) & ((1 << (end - start + 1)) - 1))
+
+void helper_movl_sreg_reg(CPUCRISState *env, uint32_t sreg, uint32_t reg)
+{
+#if !defined(CONFIG_USER_ONLY)
+ CRISCPU *cpu = cris_env_get_cpu(env);
+#endif
+ uint32_t srs;
+ srs = env->pregs[PR_SRS];
+ srs &= 3;
+ env->sregs[srs][sreg] = env->regs[reg];
+
+#if !defined(CONFIG_USER_ONLY)
+ if (srs == 1 || srs == 2) {
+ if (sreg == 6) {
+ /* Writes to tlb-hi write to mm_cause as a side
+ effect. */
+ env->sregs[SFR_RW_MM_TLB_HI] = env->regs[reg];
+ env->sregs[SFR_R_MM_CAUSE] = env->regs[reg];
+ }
+ else if (sreg == 5) {
+ uint32_t set;
+ uint32_t idx;
+ uint32_t lo, hi;
+ uint32_t vaddr;
+ int tlb_v;
+
+ idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
+ set >>= 4;
+ set &= 3;
+
+ idx &= 15;
+ /* We've just made a write to tlb_lo. */
+ lo = env->sregs[SFR_RW_MM_TLB_LO];
+ /* Writes are done via r_mm_cause. */
+ hi = env->sregs[SFR_R_MM_CAUSE];
+
+ vaddr = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].hi,
+ 13, 31);
+ vaddr <<= TARGET_PAGE_BITS;
+ tlb_v = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].lo,
+ 3, 3);
+ env->tlbsets[srs - 1][set][idx].lo = lo;
+ env->tlbsets[srs - 1][set][idx].hi = hi;
+
+ D_LOG("tlb flush vaddr=%x v=%d pc=%x\n",
+ vaddr, tlb_v, env->pc);
+ if (tlb_v) {
+ tlb_flush_page(CPU(cpu), vaddr);
+ }
+ }
+ }
+#endif
+}
+
+void helper_movl_reg_sreg(CPUCRISState *env, uint32_t reg, uint32_t sreg)
+{
+ uint32_t srs;
+ env->pregs[PR_SRS] &= 3;
+ srs = env->pregs[PR_SRS];
+
+#if !defined(CONFIG_USER_ONLY)
+ if (srs == 1 || srs == 2)
+ {
+ uint32_t set;
+ uint32_t idx;
+ uint32_t lo, hi;
+
+ idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
+ set >>= 4;
+ set &= 3;
+ idx &= 15;
+
+ /* Update the mirror regs. */
+ hi = env->tlbsets[srs - 1][set][idx].hi;
+ lo = env->tlbsets[srs - 1][set][idx].lo;
+ env->sregs[SFR_RW_MM_TLB_HI] = hi;
+ env->sregs[SFR_RW_MM_TLB_LO] = lo;
+ }
+#endif
+ env->regs[reg] = env->sregs[srs][sreg];
+}
+
+static void cris_ccs_rshift(CPUCRISState *env)
+{
+ uint32_t ccs;
+
+ /* Apply the ccs shift. */
+ ccs = env->pregs[PR_CCS];
+ ccs = (ccs & 0xc0000000) | ((ccs & 0x0fffffff) >> 10);
+ if (ccs & U_FLAG)
+ {
+ /* Enter user mode. */
+ env->ksp = env->regs[R_SP];
+ env->regs[R_SP] = env->pregs[PR_USP];
+ }
+
+ env->pregs[PR_CCS] = ccs;
+}
+
+void helper_rfe(CPUCRISState *env)
+{
+ int rflag = env->pregs[PR_CCS] & R_FLAG;
+
+ D_LOG("rfe: erp=%x pid=%x ccs=%x btarget=%x\n",
+ env->pregs[PR_ERP], env->pregs[PR_PID],
+ env->pregs[PR_CCS],
+ env->btarget);
+
+ cris_ccs_rshift(env);
+
+ /* RFE sets the P_FLAG only if the R_FLAG is not set. */
+ if (!rflag)
+ env->pregs[PR_CCS] |= P_FLAG;
+}
+
+void helper_rfn(CPUCRISState *env)
+{
+ int rflag = env->pregs[PR_CCS] & R_FLAG;
+
+ D_LOG("rfn: erp=%x pid=%x ccs=%x btarget=%x\n",
+ env->pregs[PR_ERP], env->pregs[PR_PID],
+ env->pregs[PR_CCS],
+ env->btarget);
+
+ cris_ccs_rshift(env);
+
+ /* Set the P_FLAG only if the R_FLAG is not set. */
+ if (!rflag)
+ env->pregs[PR_CCS] |= P_FLAG;
+
+ /* Always set the M flag. */
+ env->pregs[PR_CCS] |= M_FLAG_V32;
+}
+
+uint32_t helper_lz(uint32_t t0)
+{
+ return clz32(t0);
+}
+
+uint32_t helper_btst(CPUCRISState *env, uint32_t t0, uint32_t t1, uint32_t ccs)
+{
+ /* FIXME: clean this up. */
+
+ /* des ref:
+ The N flag is set according to the selected bit in the dest reg.
+ The Z flag is set if the selected bit and all bits to the right are
+ zero.
+ The X flag is cleared.
+ Other flags are left untouched.
+ The destination reg is not affected.*/
+ unsigned int fz, sbit, bset, mask, masked_t0;
+
+ sbit = t1 & 31;
+ bset = !!(t0 & (1 << sbit));
+ mask = sbit == 31 ? -1 : (1 << (sbit + 1)) - 1;
+ masked_t0 = t0 & mask;
+ fz = !(masked_t0 | bset);
+
+ /* Clear the X, N and Z flags. */
+ ccs = ccs & ~(X_FLAG | N_FLAG | Z_FLAG);
+ if (env->pregs[PR_VR] < 32)
+ ccs &= ~(V_FLAG | C_FLAG);
+ /* Set the N and Z flags accordingly. */
+ ccs |= (bset << 3) | (fz << 2);
+ return ccs;
+}
+
+static inline uint32_t evaluate_flags_writeback(CPUCRISState *env,
+ uint32_t flags, uint32_t ccs)
+{
+ unsigned int x, z, mask;
+
+ /* Extended arithmetics, leave the z flag alone. */
+ x = env->cc_x;
+ mask = env->cc_mask | X_FLAG;
+ if (x) {
+ z = flags & Z_FLAG;
+ mask = mask & ~z;
+ }
+ flags &= mask;
+
+ /* all insn clear the x-flag except setf or clrf. */
+ ccs &= ~mask;
+ ccs |= flags;
+ return ccs;
+}
+
+uint32_t helper_evaluate_flags_muls(CPUCRISState *env,
+ uint32_t ccs, uint32_t res, uint32_t mof)
+{
+ uint32_t flags = 0;
+ int64_t tmp;
+ int dneg;
+
+ dneg = ((int32_t)res) < 0;
+
+ tmp = mof;
+ tmp <<= 32;
+ tmp |= res;
+ if (tmp == 0)
+ flags |= Z_FLAG;
+ else if (tmp < 0)
+ flags |= N_FLAG;
+ if ((dneg && mof != -1)
+ || (!dneg && mof != 0))
+ flags |= V_FLAG;
+ return evaluate_flags_writeback(env, flags, ccs);
+}
+
+uint32_t helper_evaluate_flags_mulu(CPUCRISState *env,
+ uint32_t ccs, uint32_t res, uint32_t mof)
+{
+ uint32_t flags = 0;
+ uint64_t tmp;
+
+ tmp = mof;
+ tmp <<= 32;
+ tmp |= res;
+ if (tmp == 0)
+ flags |= Z_FLAG;
+ else if (tmp >> 63)
+ flags |= N_FLAG;
+ if (mof)
+ flags |= V_FLAG;
+
+ return evaluate_flags_writeback(env, flags, ccs);
+}
+
+uint32_t helper_evaluate_flags_mcp(CPUCRISState *env, uint32_t ccs,
+ uint32_t src, uint32_t dst, uint32_t res)
+{
+ uint32_t flags = 0;
+
+ src = src & 0x80000000;
+ dst = dst & 0x80000000;
+
+ if ((res & 0x80000000L) != 0L)
+ {
+ flags |= N_FLAG;
+ if (!src && !dst)
+ flags |= V_FLAG;
+ else if (src & dst)
+ flags |= R_FLAG;
+ }
+ else
+ {
+ if (res == 0L)
+ flags |= Z_FLAG;
+ if (src & dst)
+ flags |= V_FLAG;
+ if (dst | src)
+ flags |= R_FLAG;
+ }
+
+ return evaluate_flags_writeback(env, flags, ccs);
+}
+
+uint32_t helper_evaluate_flags_alu_4(CPUCRISState *env, uint32_t ccs,
+ uint32_t src, uint32_t dst, uint32_t res)
+{
+ uint32_t flags = 0;
+
+ src = src & 0x80000000;
+ dst = dst & 0x80000000;
+
+ if ((res & 0x80000000L) != 0L)
+ {
+ flags |= N_FLAG;
+ if (!src && !dst)
+ flags |= V_FLAG;
+ else if (src & dst)
+ flags |= C_FLAG;
+ }
+ else
+ {
+ if (res == 0L)
+ flags |= Z_FLAG;
+ if (src & dst)
+ flags |= V_FLAG;
+ if (dst | src)
+ flags |= C_FLAG;
+ }
+
+ return evaluate_flags_writeback(env, flags, ccs);
+}
+
+uint32_t helper_evaluate_flags_sub_4(CPUCRISState *env, uint32_t ccs,
+ uint32_t src, uint32_t dst, uint32_t res)
+{
+ uint32_t flags = 0;
+
+ src = (~src) & 0x80000000;
+ dst = dst & 0x80000000;
+
+ if ((res & 0x80000000L) != 0L)
+ {
+ flags |= N_FLAG;
+ if (!src && !dst)
+ flags |= V_FLAG;
+ else if (src & dst)
+ flags |= C_FLAG;
+ }
+ else
+ {
+ if (res == 0L)
+ flags |= Z_FLAG;
+ if (src & dst)
+ flags |= V_FLAG;
+ if (dst | src)
+ flags |= C_FLAG;
+ }
+
+ flags ^= C_FLAG;
+ return evaluate_flags_writeback(env, flags, ccs);
+}
+
+uint32_t helper_evaluate_flags_move_4(CPUCRISState *env,
+ uint32_t ccs, uint32_t res)
+{
+ uint32_t flags = 0;
+
+ if ((int32_t)res < 0)
+ flags |= N_FLAG;
+ else if (res == 0L)
+ flags |= Z_FLAG;
+
+ return evaluate_flags_writeback(env, flags, ccs);
+}
+uint32_t helper_evaluate_flags_move_2(CPUCRISState *env,
+ uint32_t ccs, uint32_t res)
+{
+ uint32_t flags = 0;
+
+ if ((int16_t)res < 0L)
+ flags |= N_FLAG;
+ else if (res == 0)
+ flags |= Z_FLAG;
+
+ return evaluate_flags_writeback(env, flags, ccs);
+}
+
+/* TODO: This is expensive. We could split things up and only evaluate part of
+ CCR on a need to know basis. For now, we simply re-evaluate everything. */
+void helper_evaluate_flags(CPUCRISState *env)
+{
+ uint32_t src, dst, res;
+ uint32_t flags = 0;
+
+ src = env->cc_src;
+ dst = env->cc_dest;
+ res = env->cc_result;
+
+ if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
+ src = ~src;
+
+ /* Now, evaluate the flags. This stuff is based on
+ Per Zander's CRISv10 simulator. */
+ switch (env->cc_size)
+ {
+ case 1:
+ if ((res & 0x80L) != 0L)
+ {
+ flags |= N_FLAG;
+ if (((src & 0x80L) == 0L)
+ && ((dst & 0x80L) == 0L))
+ {
+ flags |= V_FLAG;
+ }
+ else if (((src & 0x80L) != 0L)
+ && ((dst & 0x80L) != 0L))
+ {
+ flags |= C_FLAG;
+ }
+ }
+ else
+ {
+ if ((res & 0xFFL) == 0L)
+ {
+ flags |= Z_FLAG;
+ }
+ if (((src & 0x80L) != 0L)
+ && ((dst & 0x80L) != 0L))
+ {
+ flags |= V_FLAG;
+ }
+ if ((dst & 0x80L) != 0L
+ || (src & 0x80L) != 0L)
+ {
+ flags |= C_FLAG;
+ }
+ }
+ break;
+ case 2:
+ if ((res & 0x8000L) != 0L)
+ {
+ flags |= N_FLAG;
+ if (((src & 0x8000L) == 0L)
+ && ((dst & 0x8000L) == 0L))
+ {
+ flags |= V_FLAG;
+ }
+ else if (((src & 0x8000L) != 0L)
+ && ((dst & 0x8000L) != 0L))
+ {
+ flags |= C_FLAG;
+ }
+ }
+ else
+ {
+ if ((res & 0xFFFFL) == 0L)
+ {
+ flags |= Z_FLAG;
+ }
+ if (((src & 0x8000L) != 0L)
+ && ((dst & 0x8000L) != 0L))
+ {
+ flags |= V_FLAG;
+ }
+ if ((dst & 0x8000L) != 0L
+ || (src & 0x8000L) != 0L)
+ {
+ flags |= C_FLAG;
+ }
+ }
+ break;
+ case 4:
+ if ((res & 0x80000000L) != 0L)
+ {
+ flags |= N_FLAG;
+ if (((src & 0x80000000L) == 0L)
+ && ((dst & 0x80000000L) == 0L))
+ {
+ flags |= V_FLAG;
+ }
+ else if (((src & 0x80000000L) != 0L) &&
+ ((dst & 0x80000000L) != 0L))
+ {
+ flags |= C_FLAG;
+ }
+ }
+ else
+ {
+ if (res == 0L)
+ flags |= Z_FLAG;
+ if (((src & 0x80000000L) != 0L)
+ && ((dst & 0x80000000L) != 0L))
+ flags |= V_FLAG;
+ if ((dst & 0x80000000L) != 0L
+ || (src & 0x80000000L) != 0L)
+ flags |= C_FLAG;
+ }
+ break;
+ default:
+ break;
+ }
+
+ if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
+ flags ^= C_FLAG;
+
+ env->pregs[PR_CCS] = evaluate_flags_writeback(env, flags,
+ env->pregs[PR_CCS]);
+}
+
+void helper_top_evaluate_flags(CPUCRISState *env)
+{
+ switch (env->cc_op)
+ {
+ case CC_OP_MCP:
+ env->pregs[PR_CCS] = helper_evaluate_flags_mcp(env,
+ env->pregs[PR_CCS], env->cc_src,
+ env->cc_dest, env->cc_result);
+ break;
+ case CC_OP_MULS:
+ env->pregs[PR_CCS] = helper_evaluate_flags_muls(env,
+ env->pregs[PR_CCS], env->cc_result,
+ env->pregs[PR_MOF]);
+ break;
+ case CC_OP_MULU:
+ env->pregs[PR_CCS] = helper_evaluate_flags_mulu(env,
+ env->pregs[PR_CCS], env->cc_result,
+ env->pregs[PR_MOF]);
+ break;
+ case CC_OP_MOVE:
+ case CC_OP_AND:
+ case CC_OP_OR:
+ case CC_OP_XOR:
+ case CC_OP_ASR:
+ case CC_OP_LSR:
+ case CC_OP_LSL:
+ switch (env->cc_size)
+ {
+ case 4:
+ env->pregs[PR_CCS] =
+ helper_evaluate_flags_move_4(env,
+ env->pregs[PR_CCS],
+ env->cc_result);
+ break;
+ case 2:
+ env->pregs[PR_CCS] =
+ helper_evaluate_flags_move_2(env,
+ env->pregs[PR_CCS],
+ env->cc_result);
+ break;
+ default:
+ helper_evaluate_flags(env);
+ break;
+ }
+ break;
+ case CC_OP_FLAGS:
+ /* live. */
+ break;
+ case CC_OP_SUB:
+ case CC_OP_CMP:
+ if (env->cc_size == 4)
+ env->pregs[PR_CCS] =
+ helper_evaluate_flags_sub_4(env,
+ env->pregs[PR_CCS],
+ env->cc_src, env->cc_dest,
+ env->cc_result);
+ else
+ helper_evaluate_flags(env);
+ break;
+ default:
+ {
+ switch (env->cc_size)
+ {
+ case 4:
+ env->pregs[PR_CCS] =
+ helper_evaluate_flags_alu_4(env,
+ env->pregs[PR_CCS],
+ env->cc_src, env->cc_dest,
+ env->cc_result);
+ break;
+ default:
+ helper_evaluate_flags(env);
+ break;
+ }
+ }
+ break;
+ }
+}
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