2 * UniCore32 helper routines
4 * Copyright (C) 2010-2011 GUAN Xue-tao
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include "dyngen-exec.h"
14 #define SIGNBIT (uint32_t)0x80000000
15 #define SIGNBIT64 ((uint64_t)1 << 63)
17 void HELPER(exception)(uint32_t excp)
19 env->exception_index = excp;
23 static target_ulong asr_read(void)
27 return env->uncached_asr | (env->NF & 0x80000000) | (ZF << 30) |
28 (env->CF << 29) | ((env->VF & 0x80000000) >> 3);
31 target_ulong cpu_asr_read(CPUState *env1)
43 target_ulong HELPER(asr_read)(void)
48 static void asr_write(target_ulong val, target_ulong mask)
50 if (mask & ASR_NZCV) {
51 env->ZF = (~val) & ASR_Z;
53 env->CF = (val >> 29) & 1;
54 env->VF = (val << 3) & 0x80000000;
57 if ((env->uncached_asr ^ val) & mask & ASR_M) {
58 switch_mode(env, val & ASR_M);
61 env->uncached_asr = (env->uncached_asr & ~mask) | (val & mask);
64 void cpu_asr_write(CPUState *env1, target_ulong val, target_ulong mask)
74 void HELPER(asr_write)(target_ulong val, target_ulong mask)
79 /* Access to user mode registers from privileged modes. */
80 uint32_t HELPER(get_user_reg)(uint32_t regno)
85 val = env->banked_r29[0];
86 } else if (regno == 30) {
87 val = env->banked_r30[0];
89 val = env->regs[regno];
94 void HELPER(set_user_reg)(uint32_t regno, uint32_t val)
97 env->banked_r29[0] = val;
98 } else if (regno == 30) {
99 env->banked_r30[0] = val;
101 env->regs[regno] = val;
105 /* ??? Flag setting arithmetic is awkward because we need to do comparisons.
106 The only way to do that in TCG is a conditional branch, which clobbers
107 all our temporaries. For now implement these as helper functions. */
109 uint32_t HELPER(add_cc)(uint32_t a, uint32_t b)
113 env->NF = env->ZF = result;
114 env->CF = result < a;
115 env->VF = (a ^ b ^ -1) & (a ^ result);
119 uint32_t HELPER(adc_cc)(uint32_t a, uint32_t b)
124 env->CF = result < a;
127 env->CF = result <= a;
129 env->VF = (a ^ b ^ -1) & (a ^ result);
130 env->NF = env->ZF = result;
134 uint32_t HELPER(sub_cc)(uint32_t a, uint32_t b)
138 env->NF = env->ZF = result;
140 env->VF = (a ^ b) & (a ^ result);
144 uint32_t HELPER(sbc_cc)(uint32_t a, uint32_t b)
154 env->VF = (a ^ b) & (a ^ result);
155 env->NF = env->ZF = result;
159 /* Similarly for variable shift instructions. */
161 uint32_t HELPER(shl)(uint32_t x, uint32_t i)
163 int shift = i & 0xff;
170 uint32_t HELPER(shr)(uint32_t x, uint32_t i)
172 int shift = i & 0xff;
176 return (uint32_t)x >> shift;
179 uint32_t HELPER(sar)(uint32_t x, uint32_t i)
181 int shift = i & 0xff;
185 return (int32_t)x >> shift;
188 uint32_t HELPER(shl_cc)(uint32_t x, uint32_t i)
190 int shift = i & 0xff;
198 } else if (shift != 0) {
199 env->CF = (x >> (32 - shift)) & 1;
205 uint32_t HELPER(shr_cc)(uint32_t x, uint32_t i)
207 int shift = i & 0xff;
210 env->CF = (x >> 31) & 1;
215 } else if (shift != 0) {
216 env->CF = (x >> (shift - 1)) & 1;
222 uint32_t HELPER(sar_cc)(uint32_t x, uint32_t i)
224 int shift = i & 0xff;
226 env->CF = (x >> 31) & 1;
227 return (int32_t)x >> 31;
228 } else if (shift != 0) {
229 env->CF = (x >> (shift - 1)) & 1;
230 return (int32_t)x >> shift;
235 uint32_t HELPER(ror_cc)(uint32_t x, uint32_t i)
239 shift = shift1 & 0x1f;
242 env->CF = (x >> 31) & 1;
246 env->CF = (x >> (shift - 1)) & 1;
247 return ((uint32_t)x >> shift) | (x << (32 - shift));