target-ppc/mem_helper.c

   1 /*
   2  *  PowerPC memory access emulation helpers for QEMU.
   3  *
   4  *  Copyright (c) 2003-2007 Jocelyn Mayer
   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, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include "cpu.h"
  20 #include "qemu/host-utils.h"
  21 #include "helper.h"
  22
  23 #include "helper_regs.h"
  24
  25 #if !defined(CONFIG_USER_ONLY)
  26 #include "exec/softmmu_exec.h"
  27 #endif /* !defined(CONFIG_USER_ONLY) */
  28
  29 //#define DEBUG_OP
  30
  31 /*****************************************************************************/
  32 /* Memory load and stores */
  33
  34 static inline target_ulong addr_add(CPUPPCState *env, target_ulong addr,
  35                                     target_long arg)
  36 {
  37 #if defined(TARGET_PPC64)
  38     if (!msr_is_64bit(env, env->msr)) {
  39         return (uint32_t)(addr + arg);
  40     } else
  41 #endif
  42     {
  43         return addr + arg;
  44     }
  45 }
  46
  47 void helper_lmw(CPUPPCState *env, target_ulong addr, uint32_t reg)
  48 {
  49     for (; reg < 32; reg++) {
  50         if (msr_le) {
  51             env->gpr[reg] = bswap32(cpu_ldl_data(env, addr));
  52         } else {
  53             env->gpr[reg] = cpu_ldl_data(env, addr);
  54         }
  55         addr = addr_add(env, addr, 4);
  56     }
  57 }
  58
  59 void helper_stmw(CPUPPCState *env, target_ulong addr, uint32_t reg)
  60 {
  61     for (; reg < 32; reg++) {
  62         if (msr_le) {
  63             cpu_stl_data(env, addr, bswap32((uint32_t)env->gpr[reg]));
  64         } else {
  65             cpu_stl_data(env, addr, (uint32_t)env->gpr[reg]);
  66         }
  67         addr = addr_add(env, addr, 4);
  68     }
  69 }
  70
  71 void helper_lsw(CPUPPCState *env, target_ulong addr, uint32_t nb, uint32_t reg)
  72 {
  73     int sh;
  74
  75     for (; nb > 3; nb -= 4) {
  76         env->gpr[reg] = cpu_ldl_data(env, addr);
  77         reg = (reg + 1) % 32;
  78         addr = addr_add(env, addr, 4);
  79     }
  80     if (unlikely(nb > 0)) {
  81         env->gpr[reg] = 0;
  82         for (sh = 24; nb > 0; nb--, sh -= 8) {
  83             env->gpr[reg] |= cpu_ldub_data(env, addr) << sh;
  84             addr = addr_add(env, addr, 1);
  85         }
  86     }
  87 }
  88 /* PPC32 specification says we must generate an exception if
  89  * rA is in the range of registers to be loaded.
  90  * In an other hand, IBM says this is valid, but rA won't be loaded.
  91  * For now, I'll follow the spec...
  92  */
  93 void helper_lswx(CPUPPCState *env, target_ulong addr, uint32_t reg,
  94                  uint32_t ra, uint32_t rb)
  95 {
  96     if (likely(xer_bc != 0)) {
  97         if (unlikely((ra != 0 && reg < ra && (reg + xer_bc) > ra) ||
  98                      (reg < rb && (reg + xer_bc) > rb))) {
  99             helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
 100                                        POWERPC_EXCP_INVAL |
 101                                        POWERPC_EXCP_INVAL_LSWX);
 102         } else {
 103             helper_lsw(env, addr, xer_bc, reg);
 104         }
 105     }
 106 }
 107
 108 void helper_stsw(CPUPPCState *env, target_ulong addr, uint32_t nb,
 109                  uint32_t reg)
 110 {
 111     int sh;
 112
 113     for (; nb > 3; nb -= 4) {
 114         cpu_stl_data(env, addr, env->gpr[reg]);
 115         reg = (reg + 1) % 32;
 116         addr = addr_add(env, addr, 4);
 117     }
 118     if (unlikely(nb > 0)) {
 119         for (sh = 24; nb > 0; nb--, sh -= 8) {
 120             cpu_stb_data(env, addr, (env->gpr[reg] >> sh) & 0xFF);
 121             addr = addr_add(env, addr, 1);
 122         }
 123     }
 124 }
 125
 126 static void do_dcbz(CPUPPCState *env, target_ulong addr, int dcache_line_size)
 127 {
 128     int i;
 129
 130     addr &= ~(dcache_line_size - 1);
 131     for (i = 0; i < dcache_line_size; i += 4) {
 132         cpu_stl_data(env, addr + i, 0);
 133     }
 134     if (env->reserve_addr == addr) {
 135         env->reserve_addr = (target_ulong)-1ULL;
 136     }
 137 }
 138
 139 void helper_dcbz(CPUPPCState *env, target_ulong addr)
 140 {
 141     do_dcbz(env, addr, env->dcache_line_size);
 142 }
 143
 144 void helper_dcbz_970(CPUPPCState *env, target_ulong addr)
 145 {
 146     if (((env->spr[SPR_970_HID5] >> 7) & 0x3) == 1) {
 147         do_dcbz(env, addr, 32);
 148     } else {
 149         do_dcbz(env, addr, env->dcache_line_size);
 150     }
 151 }
 152
 153 void helper_icbi(CPUPPCState *env, target_ulong addr)
 154 {
 155     addr &= ~(env->dcache_line_size - 1);
 156     /* Invalidate one cache line :
 157      * PowerPC specification says this is to be treated like a load
 158      * (not a fetch) by the MMU. To be sure it will be so,
 159      * do the load "by hand".
 160      */
 161     cpu_ldl_data(env, addr);
 162 }
 163
 164 /* XXX: to be tested */
 165 target_ulong helper_lscbx(CPUPPCState *env, target_ulong addr, uint32_t reg,
 166                           uint32_t ra, uint32_t rb)
 167 {
 168     int i, c, d;
 169
 170     d = 24;
 171     for (i = 0; i < xer_bc; i++) {
 172         c = cpu_ldub_data(env, addr);
 173         addr = addr_add(env, addr, 1);
 174         /* ra (if not 0) and rb are never modified */
 175         if (likely(reg != rb && (ra == 0 || reg != ra))) {
 176             env->gpr[reg] = (env->gpr[reg] & ~(0xFF << d)) | (c << d);
 177         }
 178         if (unlikely(c == xer_cmp)) {
 179             break;
 180         }
 181         if (likely(d != 0)) {
 182             d -= 8;
 183         } else {
 184             d = 24;
 185             reg++;
 186             reg = reg & 0x1F;
 187         }
 188     }
 189     return i;
 190 }
 191
 192 /*****************************************************************************/
 193 /* Altivec extension helpers */
 194 #if defined(HOST_WORDS_BIGENDIAN)
 195 #define HI_IDX 0
 196 #define LO_IDX 1
 197 #else
 198 #define HI_IDX 1
 199 #define LO_IDX 0
 200 #endif
 201
 202 #define LVE(name, access, swap, element)                        \
 203     void helper_##name(CPUPPCState *env, ppc_avr_t *r,          \
 204                        target_ulong addr)                       \
 205     {                                                           \
 206         size_t n_elems = ARRAY_SIZE(r->element);                \
 207         int adjust = HI_IDX*(n_elems - 1);                      \
 208         int sh = sizeof(r->element[0]) >> 1;                    \
 209         int index = (addr & 0xf) >> sh;                         \
 210                                                                 \
 211         if (msr_le) {                                           \
 212             r->element[LO_IDX ? index : (adjust - index)] =     \
 213                 swap(access(env, addr));                        \
 214         } else {                                                \
 215             r->element[LO_IDX ? index : (adjust - index)] =     \
 216                 access(env, addr);                              \
 217         }                                                       \
 218     }
 219 #define I(x) (x)
 220 LVE(lvebx, cpu_ldub_data, I, u8)
 221 LVE(lvehx, cpu_lduw_data, bswap16, u16)
 222 LVE(lvewx, cpu_ldl_data, bswap32, u32)
 223 #undef I
 224 #undef LVE
 225
 226 #define STVE(name, access, swap, element)                               \
 227     void helper_##name(CPUPPCState *env, ppc_avr_t *r,                  \
 228                        target_ulong addr)                               \
 229     {                                                                   \
 230         size_t n_elems = ARRAY_SIZE(r->element);                        \
 231         int adjust = HI_IDX * (n_elems - 1);                            \
 232         int sh = sizeof(r->element[0]) >> 1;                            \
 233         int index = (addr & 0xf) >> sh;                                 \
 234                                                                         \
 235         if (msr_le) {                                                   \
 236             access(env, addr, swap(r->element[LO_IDX ? index :          \
 237                                               (adjust - index)]));      \
 238         } else {                                                        \
 239             access(env, addr, r->element[LO_IDX ? index :               \
 240                                          (adjust - index)]);            \
 241         }                                                               \
 242     }
 243 #define I(x) (x)
 244 STVE(stvebx, cpu_stb_data, I, u8)
 245 STVE(stvehx, cpu_stw_data, bswap16, u16)
 246 STVE(stvewx, cpu_stl_data, bswap32, u32)
 247 #undef I
 248 #undef LVE
 249
 250 #undef HI_IDX
 251 #undef LO_IDX
 252
 253 /*****************************************************************************/
 254 /* Softmmu support */
 255 #if !defined(CONFIG_USER_ONLY)
 256
 257 #define MMUSUFFIX _mmu
 258
 259 #define SHIFT 0
 260 #include "exec/softmmu_template.h"
 261
 262 #define SHIFT 1
 263 #include "exec/softmmu_template.h"
 264
 265 #define SHIFT 2
 266 #include "exec/softmmu_template.h"
 267
 268 #define SHIFT 3
 269 #include "exec/softmmu_template.h"
 270
 271 /* try to fill the TLB and return an exception if error. If retaddr is
 272    NULL, it means that the function was called in C code (i.e. not
 273    from generated code or from helper.c) */
 274 /* XXX: fix it to restore all registers */
 275 void tlb_fill(CPUPPCState *env, target_ulong addr, int is_write, int mmu_idx,
 276               uintptr_t retaddr)
 277 {
 278     int ret;
 279
 280     ret = cpu_ppc_handle_mmu_fault(env, addr, is_write, mmu_idx);
 281     if (unlikely(ret != 0)) {
 282         if (likely(retaddr)) {
 283             /* now we have a real cpu fault */
 284             cpu_restore_state(env, retaddr);
 285         }
 286         helper_raise_exception_err(env, env->exception_index, env->error_code);
 287     }
 288 }
 289 #endif /* !CONFIG_USER_ONLY */