Edgar E. Iglesias | 4acb54b | 2009-05-20 19:37:39 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Microblaze helper routines. |
| 3 | * |
| 4 | * Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>. |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | #include <assert.h> |
| 22 | #include "exec.h" |
| 23 | #include "helper.h" |
| 24 | #include "host-utils.h" |
| 25 | |
| 26 | #define D(x) |
| 27 | |
| 28 | #if !defined(CONFIG_USER_ONLY) |
| 29 | #define MMUSUFFIX _mmu |
| 30 | #define SHIFT 0 |
| 31 | #include "softmmu_template.h" |
| 32 | #define SHIFT 1 |
| 33 | #include "softmmu_template.h" |
| 34 | #define SHIFT 2 |
| 35 | #include "softmmu_template.h" |
| 36 | #define SHIFT 3 |
| 37 | #include "softmmu_template.h" |
| 38 | |
| 39 | /* Try to fill the TLB and return an exception if error. If retaddr is |
| 40 | NULL, it means that the function was called in C code (i.e. not |
| 41 | from generated code or from helper.c) */ |
| 42 | /* XXX: fix it to restore all registers */ |
| 43 | void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr) |
| 44 | { |
| 45 | TranslationBlock *tb; |
| 46 | CPUState *saved_env; |
| 47 | unsigned long pc; |
| 48 | int ret; |
| 49 | |
| 50 | /* XXX: hack to restore env in all cases, even if not called from |
| 51 | generated code */ |
| 52 | saved_env = env; |
| 53 | env = cpu_single_env; |
| 54 | |
| 55 | ret = cpu_mb_handle_mmu_fault(env, addr, is_write, mmu_idx, 1); |
| 56 | if (unlikely(ret)) { |
| 57 | if (retaddr) { |
| 58 | /* now we have a real cpu fault */ |
| 59 | pc = (unsigned long)retaddr; |
| 60 | tb = tb_find_pc(pc); |
| 61 | if (tb) { |
| 62 | /* the PC is inside the translated code. It means that we have |
| 63 | a virtual CPU fault */ |
| 64 | cpu_restore_state(tb, env, pc, NULL); |
| 65 | } |
| 66 | } |
| 67 | cpu_loop_exit(); |
| 68 | } |
| 69 | env = saved_env; |
| 70 | } |
| 71 | #endif |
| 72 | |
| 73 | void helper_raise_exception(uint32_t index) |
| 74 | { |
| 75 | env->exception_index = index; |
| 76 | cpu_loop_exit(); |
| 77 | } |
| 78 | |
| 79 | void helper_debug(void) |
| 80 | { |
| 81 | int i; |
| 82 | |
| 83 | qemu_log("PC=%8.8x\n", env->sregs[SR_PC]); |
| 84 | for (i = 0; i < 32; i++) { |
| 85 | qemu_log("r%2.2d=%8.8x ", i, env->regs[i]); |
| 86 | if ((i + 1) % 4 == 0) |
| 87 | qemu_log("\n"); |
| 88 | } |
| 89 | qemu_log("\n\n"); |
| 90 | } |
| 91 | |
| 92 | static inline uint32_t compute_carry(uint32_t a, uint32_t b, uint32_t cin) |
| 93 | { |
| 94 | uint32_t cout = 0; |
| 95 | |
| 96 | if ((b == ~0) && cin) |
| 97 | cout = 1; |
| 98 | else if ((~0 - a) < (b + cin)) |
| 99 | cout = 1; |
| 100 | return cout; |
| 101 | } |
| 102 | |
| 103 | uint32_t helper_cmp(uint32_t a, uint32_t b) |
| 104 | { |
| 105 | uint32_t t; |
| 106 | |
| 107 | t = b + ~a + 1; |
| 108 | if ((b & 0x80000000) ^ (a & 0x80000000)) |
| 109 | t = (t & 0x7fffffff) | (b & 0x80000000); |
| 110 | return t; |
| 111 | } |
| 112 | |
| 113 | uint32_t helper_cmpu(uint32_t a, uint32_t b) |
| 114 | { |
| 115 | uint32_t t; |
| 116 | |
| 117 | t = b + ~a + 1; |
| 118 | if ((b & 0x80000000) ^ (a & 0x80000000)) |
| 119 | t = (t & 0x7fffffff) | (a & 0x80000000); |
| 120 | return t; |
| 121 | } |
| 122 | |
| 123 | uint32_t helper_addkc(uint32_t a, uint32_t b, uint32_t k, uint32_t c) |
| 124 | { |
| 125 | uint32_t d, cf = 0, ncf; |
| 126 | |
| 127 | if (c) |
| 128 | cf = env->sregs[SR_MSR] >> 31; |
| 129 | assert(cf == 0 || cf == 1); |
| 130 | d = a + b + cf; |
| 131 | |
| 132 | if (!k) { |
| 133 | ncf = compute_carry(a, b, cf); |
| 134 | assert(ncf == 0 || ncf == 1); |
| 135 | if (ncf) |
| 136 | env->sregs[SR_MSR] |= MSR_C | MSR_CC; |
| 137 | else |
| 138 | env->sregs[SR_MSR] &= ~(MSR_C | MSR_CC); |
| 139 | } |
| 140 | D(qemu_log("%x = %x + %x cf=%d ncf=%d k=%d c=%d\n", |
| 141 | d, a, b, cf, ncf, k, c)); |
| 142 | return d; |
| 143 | } |
| 144 | |
| 145 | uint32_t helper_subkc(uint32_t a, uint32_t b, uint32_t k, uint32_t c) |
| 146 | { |
| 147 | uint32_t d, cf = 1, ncf; |
| 148 | |
| 149 | if (c) |
| 150 | cf = env->sregs[SR_MSR] >> 31; |
| 151 | assert(cf == 0 || cf == 1); |
| 152 | d = b + ~a + cf; |
| 153 | |
| 154 | if (!k) { |
| 155 | ncf = compute_carry(b, ~a, cf); |
| 156 | assert(ncf == 0 || ncf == 1); |
| 157 | if (ncf) |
| 158 | env->sregs[SR_MSR] |= MSR_C | MSR_CC; |
| 159 | else |
| 160 | env->sregs[SR_MSR] &= ~(MSR_C | MSR_CC); |
| 161 | } |
| 162 | D(qemu_log("%x = %x + %x cf=%d ncf=%d k=%d c=%d\n", |
| 163 | d, a, b, cf, ncf, k, c)); |
| 164 | return d; |
| 165 | } |
| 166 | |
| 167 | static inline int div_prepare(uint32_t a, uint32_t b) |
| 168 | { |
| 169 | if (b == 0) { |
| 170 | env->sregs[SR_MSR] |= MSR_DZ; |
| 171 | /* FIXME: Raise the div by zero exception. */ |
| 172 | return 0; |
| 173 | } |
| 174 | env->sregs[SR_MSR] &= ~MSR_DZ; |
| 175 | return 1; |
| 176 | } |
| 177 | |
| 178 | uint32_t helper_divs(uint32_t a, uint32_t b) |
| 179 | { |
| 180 | if (!div_prepare(a, b)) |
| 181 | return 0; |
| 182 | return (int32_t)a / (int32_t)b; |
| 183 | } |
| 184 | |
| 185 | uint32_t helper_divu(uint32_t a, uint32_t b) |
| 186 | { |
| 187 | if (!div_prepare(a, b)) |
| 188 | return 0; |
| 189 | return a / b; |
| 190 | } |
| 191 | |
| 192 | uint32_t helper_pcmpbf(uint32_t a, uint32_t b) |
| 193 | { |
| 194 | unsigned int i; |
| 195 | uint32_t mask = 0xff000000; |
| 196 | |
| 197 | for (i = 0; i < 4; i++) { |
| 198 | if ((a & mask) == (b & mask)) |
| 199 | return i + 1; |
| 200 | mask >>= 8; |
| 201 | } |
| 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | #if !defined(CONFIG_USER_ONLY) |
| 206 | /* Writes/reads to the MMU's special regs end up here. */ |
| 207 | uint32_t helper_mmu_read(uint32_t rn) |
| 208 | { |
| 209 | return mmu_read(env, rn); |
| 210 | } |
| 211 | |
| 212 | void helper_mmu_write(uint32_t rn, uint32_t v) |
| 213 | { |
| 214 | mmu_write(env, rn, v); |
| 215 | } |
| 216 | #endif |