Initial import of qemu-2.4.1HEADmaster

1 files changed, 642 insertions, 0 deletions

diff --git a/target-cris/op_helper.c b/target-cris/op_helper.c
new file mode 100644
index 00000000..5c0c14d9
--- /dev/null
+++ b/target-cris/op_helper.c
@@ -0,0 +1,642 @@
+/*
+ *  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;
+	}
+}