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-rw-r--r--target-unicore32/op_helper.c259
1 files changed, 259 insertions, 0 deletions
diff --git a/target-unicore32/op_helper.c b/target-unicore32/op_helper.c
new file mode 100644
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--- /dev/null
+++ b/target-unicore32/op_helper.c
@@ -0,0 +1,259 @@
+/*
+ * UniCore32 helper routines
+ *
+ * Copyright (C) 2010-2012 Guan Xuetao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation, or (at your option) any
+ * later version. See the COPYING file in the top-level directory.
+ */
+#include "cpu.h"
+#include "exec/helper-proto.h"
+#include "exec/cpu_ldst.h"
+
+#define SIGNBIT (uint32_t)0x80000000
+#define SIGNBIT64 ((uint64_t)1 << 63)
+
+void HELPER(exception)(CPUUniCore32State *env, uint32_t excp)
+{
+ CPUState *cs = CPU(uc32_env_get_cpu(env));
+
+ cs->exception_index = excp;
+ cpu_loop_exit(cs);
+}
+
+static target_ulong asr_read(CPUUniCore32State *env)
+{
+ int ZF;
+ ZF = (env->ZF == 0);
+ return env->uncached_asr | (env->NF & 0x80000000) | (ZF << 30) |
+ (env->CF << 29) | ((env->VF & 0x80000000) >> 3);
+}
+
+target_ulong cpu_asr_read(CPUUniCore32State *env)
+{
+ return asr_read(env);
+}
+
+target_ulong HELPER(asr_read)(CPUUniCore32State *env)
+{
+ return asr_read(env);
+}
+
+static void asr_write(CPUUniCore32State *env, target_ulong val,
+ target_ulong mask)
+{
+ if (mask & ASR_NZCV) {
+ env->ZF = (~val) & ASR_Z;
+ env->NF = val;
+ env->CF = (val >> 29) & 1;
+ env->VF = (val << 3) & 0x80000000;
+ }
+
+ if ((env->uncached_asr ^ val) & mask & ASR_M) {
+ switch_mode(env, val & ASR_M);
+ }
+ mask &= ~ASR_NZCV;
+ env->uncached_asr = (env->uncached_asr & ~mask) | (val & mask);
+}
+
+void cpu_asr_write(CPUUniCore32State *env, target_ulong val, target_ulong mask)
+{
+ asr_write(env, val, mask);
+}
+
+void HELPER(asr_write)(CPUUniCore32State *env, target_ulong val,
+ target_ulong mask)
+{
+ asr_write(env, val, mask);
+}
+
+/* Access to user mode registers from privileged modes. */
+uint32_t HELPER(get_user_reg)(CPUUniCore32State *env, uint32_t regno)
+{
+ uint32_t val;
+
+ if (regno == 29) {
+ val = env->banked_r29[0];
+ } else if (regno == 30) {
+ val = env->banked_r30[0];
+ } else {
+ val = env->regs[regno];
+ }
+ return val;
+}
+
+void HELPER(set_user_reg)(CPUUniCore32State *env, uint32_t regno, uint32_t val)
+{
+ if (regno == 29) {
+ env->banked_r29[0] = val;
+ } else if (regno == 30) {
+ env->banked_r30[0] = val;
+ } else {
+ env->regs[regno] = val;
+ }
+}
+
+/* ??? Flag setting arithmetic is awkward because we need to do comparisons.
+ The only way to do that in TCG is a conditional branch, which clobbers
+ all our temporaries. For now implement these as helper functions. */
+
+uint32_t HELPER(add_cc)(CPUUniCore32State *env, uint32_t a, uint32_t b)
+{
+ uint32_t result;
+ result = a + b;
+ env->NF = env->ZF = result;
+ env->CF = result < a;
+ env->VF = (a ^ b ^ -1) & (a ^ result);
+ return result;
+}
+
+uint32_t HELPER(adc_cc)(CPUUniCore32State *env, uint32_t a, uint32_t b)
+{
+ uint32_t result;
+ if (!env->CF) {
+ result = a + b;
+ env->CF = result < a;
+ } else {
+ result = a + b + 1;
+ env->CF = result <= a;
+ }
+ env->VF = (a ^ b ^ -1) & (a ^ result);
+ env->NF = env->ZF = result;
+ return result;
+}
+
+uint32_t HELPER(sub_cc)(CPUUniCore32State *env, uint32_t a, uint32_t b)
+{
+ uint32_t result;
+ result = a - b;
+ env->NF = env->ZF = result;
+ env->CF = a >= b;
+ env->VF = (a ^ b) & (a ^ result);
+ return result;
+}
+
+uint32_t HELPER(sbc_cc)(CPUUniCore32State *env, uint32_t a, uint32_t b)
+{
+ uint32_t result;
+ if (!env->CF) {
+ result = a - b - 1;
+ env->CF = a > b;
+ } else {
+ result = a - b;
+ env->CF = a >= b;
+ }
+ env->VF = (a ^ b) & (a ^ result);
+ env->NF = env->ZF = result;
+ return result;
+}
+
+/* Similarly for variable shift instructions. */
+
+uint32_t HELPER(shl)(uint32_t x, uint32_t i)
+{
+ int shift = i & 0xff;
+ if (shift >= 32) {
+ return 0;
+ }
+ return x << shift;
+}
+
+uint32_t HELPER(shr)(uint32_t x, uint32_t i)
+{
+ int shift = i & 0xff;
+ if (shift >= 32) {
+ return 0;
+ }
+ return (uint32_t)x >> shift;
+}
+
+uint32_t HELPER(sar)(uint32_t x, uint32_t i)
+{
+ int shift = i & 0xff;
+ if (shift >= 32) {
+ shift = 31;
+ }
+ return (int32_t)x >> shift;
+}
+
+uint32_t HELPER(shl_cc)(CPUUniCore32State *env, uint32_t x, uint32_t i)
+{
+ int shift = i & 0xff;
+ if (shift >= 32) {
+ if (shift == 32) {
+ env->CF = x & 1;
+ } else {
+ env->CF = 0;
+ }
+ return 0;
+ } else if (shift != 0) {
+ env->CF = (x >> (32 - shift)) & 1;
+ return x << shift;
+ }
+ return x;
+}
+
+uint32_t HELPER(shr_cc)(CPUUniCore32State *env, uint32_t x, uint32_t i)
+{
+ int shift = i & 0xff;
+ if (shift >= 32) {
+ if (shift == 32) {
+ env->CF = (x >> 31) & 1;
+ } else {
+ env->CF = 0;
+ }
+ return 0;
+ } else if (shift != 0) {
+ env->CF = (x >> (shift - 1)) & 1;
+ return x >> shift;
+ }
+ return x;
+}
+
+uint32_t HELPER(sar_cc)(CPUUniCore32State *env, uint32_t x, uint32_t i)
+{
+ int shift = i & 0xff;
+ if (shift >= 32) {
+ env->CF = (x >> 31) & 1;
+ return (int32_t)x >> 31;
+ } else if (shift != 0) {
+ env->CF = (x >> (shift - 1)) & 1;
+ return (int32_t)x >> shift;
+ }
+ return x;
+}
+
+uint32_t HELPER(ror_cc)(CPUUniCore32State *env, uint32_t x, uint32_t i)
+{
+ int shift1, shift;
+ shift1 = i & 0xff;
+ shift = shift1 & 0x1f;
+ if (shift == 0) {
+ if (shift1 != 0) {
+ env->CF = (x >> 31) & 1;
+ }
+ return x;
+ } else {
+ env->CF = (x >> (shift - 1)) & 1;
+ return ((uint32_t)x >> shift) | (x << (32 - shift));
+ }
+}
+
+#ifndef CONFIG_USER_ONLY
+void tlb_fill(CPUState *cs, target_ulong addr, int is_write,
+ int mmu_idx, uintptr_t retaddr)
+{
+ int ret;
+
+ ret = uc32_cpu_handle_mmu_fault(cs, addr, is_write, mmu_idx);
+ if (unlikely(ret)) {
+ if (retaddr) {
+ /* now we have a real cpu fault */
+ cpu_restore_state(cs, retaddr);
+ }
+ cpu_loop_exit(cs);
+ }
+}
+#endif
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