env->dregs[Dc1] = l1;
env->dregs[Dc2] = l2;
}
+
+struct bf_data {
+ uint32_t addr;
+ uint32_t bofs;
+ uint32_t blen;
+ uint32_t len;
+};
+
+static struct bf_data bf_prep(uint32_t addr, int32_t ofs, uint32_t len)
+{
+ int bofs, blen;
+
+ /* Bound length; map 0 to 32. */
+ len = ((len - 1) & 31) + 1;
+
+ /* Note that ofs is signed. */
+ addr += ofs / 8;
+ bofs = ofs % 8;
+ if (bofs < 0) {
+ bofs += 8;
+ addr -= 1;
+ }
+
+ /* Compute the number of bytes required (minus one) to
+ satisfy the bitfield. */
+ blen = (bofs + len - 1) / 8;
+
+ /* Canonicalize the bit offset for data loaded into a 64-bit big-endian
+ word. For the cases where BLEN is not a power of 2, adjust ADDR so
+ that we can use the next power of two sized load without crossing a
+ page boundary, unless the field itself crosses the boundary. */
+ switch (blen) {
+ case 0:
+ bofs += 56;
+ break;
+ case 1:
+ bofs += 48;
+ break;
+ case 2:
+ if (addr & 1) {
+ bofs += 8;
+ addr -= 1;
+ }
+ /* fallthru */
+ case 3:
+ bofs += 32;
+ break;
+ case 4:
+ if (addr & 3) {
+ bofs += 8 * (addr & 3);
+ addr &= -4;
+ }
+ break;
+ default:
+ g_assert_not_reached();
+ }
+
+ return (struct bf_data){
+ .addr = addr,
+ .bofs = bofs,
+ .blen = blen,
+ .len = len,
+ };
+}
+
+static uint64_t bf_load(CPUM68KState *env, uint32_t addr, int blen,
+ uintptr_t ra)
+{
+ switch (blen) {
+ case 0:
+ return cpu_ldub_data_ra(env, addr, ra);
+ case 1:
+ return cpu_lduw_data_ra(env, addr, ra);
+ case 2:
+ case 3:
+ return cpu_ldl_data_ra(env, addr, ra);
+ case 4:
+ return cpu_ldq_data_ra(env, addr, ra);
+ default:
+ g_assert_not_reached();
+ }
+}
+
+static void bf_store(CPUM68KState *env, uint32_t addr, int blen,
+ uint64_t data, uintptr_t ra)
+{
+ switch (blen) {
+ case 0:
+ cpu_stb_data_ra(env, addr, data, ra);
+ break;
+ case 1:
+ cpu_stw_data_ra(env, addr, data, ra);
+ break;
+ case 2:
+ case 3:
+ cpu_stl_data_ra(env, addr, data, ra);
+ break;
+ case 4:
+ cpu_stq_data_ra(env, addr, data, ra);
+ break;
+ default:
+ g_assert_not_reached();
+ }
+}
+
+uint32_t HELPER(bfexts_mem)(CPUM68KState *env, uint32_t addr,
+ int32_t ofs, uint32_t len)
+{
+ uintptr_t ra = GETPC();
+ struct bf_data d = bf_prep(addr, ofs, len);
+ uint64_t data = bf_load(env, d.addr, d.blen, ra);
+
+ return (int64_t)(data << d.bofs) >> (64 - d.len);
+}
+
+uint64_t HELPER(bfextu_mem)(CPUM68KState *env, uint32_t addr,
+ int32_t ofs, uint32_t len)
+{
+ uintptr_t ra = GETPC();
+ struct bf_data d = bf_prep(addr, ofs, len);
+ uint64_t data = bf_load(env, d.addr, d.blen, ra);
+
+ /* Put CC_N at the top of the high word; put the zero-extended value
+ at the bottom of the low word. */
+ data <<= d.bofs;
+ data >>= 64 - d.len;
+ data |= data << (64 - d.len);
+
+ return data;
+}
+
+uint32_t HELPER(bfins_mem)(CPUM68KState *env, uint32_t addr, uint32_t val,
+ int32_t ofs, uint32_t len)
+{
+ uintptr_t ra = GETPC();
+ struct bf_data d = bf_prep(addr, ofs, len);
+ uint64_t data = bf_load(env, d.addr, d.blen, ra);
+ uint64_t mask = -1ull << (64 - d.len) >> d.bofs;
+
+ data = (data & ~mask) | (((uint64_t)val << (64 - d.len)) >> d.bofs);
+
+ bf_store(env, d.addr, d.blen, data, ra);
+
+ /* The field at the top of the word is also CC_N for CC_OP_LOGIC. */
+ return val << (32 - d.len);
+}
+
+uint32_t HELPER(bfchg_mem)(CPUM68KState *env, uint32_t addr,
+ int32_t ofs, uint32_t len)
+{
+ uintptr_t ra = GETPC();
+ struct bf_data d = bf_prep(addr, ofs, len);
+ uint64_t data = bf_load(env, d.addr, d.blen, ra);
+ uint64_t mask = -1ull << (64 - d.len) >> d.bofs;
+
+ bf_store(env, d.addr, d.blen, data ^ mask, ra);
+
+ return ((data & mask) << d.bofs) >> 32;
+}
+
+uint32_t HELPER(bfclr_mem)(CPUM68KState *env, uint32_t addr,
+ int32_t ofs, uint32_t len)
+{
+ uintptr_t ra = GETPC();
+ struct bf_data d = bf_prep(addr, ofs, len);
+ uint64_t data = bf_load(env, d.addr, d.blen, ra);
+ uint64_t mask = -1ull << (64 - d.len) >> d.bofs;
+
+ bf_store(env, d.addr, d.blen, data & ~mask, ra);
+
+ return ((data & mask) << d.bofs) >> 32;
+}
+
+uint32_t HELPER(bfset_mem)(CPUM68KState *env, uint32_t addr,
+ int32_t ofs, uint32_t len)
+{
+ uintptr_t ra = GETPC();
+ struct bf_data d = bf_prep(addr, ofs, len);
+ uint64_t data = bf_load(env, d.addr, d.blen, ra);
+ uint64_t mask = -1ull << (64 - d.len) >> d.bofs;
+
+ bf_store(env, d.addr, d.blen, data | mask, ra);
+
+ return ((data & mask) << d.bofs) >> 32;
+}
+
+uint32_t HELPER(bfffo_reg)(uint32_t n, uint32_t ofs, uint32_t len)
+{
+ return (n ? clz32(n) : len) + ofs;
+}
+
+uint64_t HELPER(bfffo_mem)(CPUM68KState *env, uint32_t addr,
+ int32_t ofs, uint32_t len)
+{
+ uintptr_t ra = GETPC();
+ struct bf_data d = bf_prep(addr, ofs, len);
+ uint64_t data = bf_load(env, d.addr, d.blen, ra);
+ uint64_t mask = -1ull << (64 - d.len) >> d.bofs;
+ uint64_t n = (data & mask) << d.bofs;
+ uint32_t ffo = helper_bfffo_reg(n >> 32, ofs, d.len);
+
+ /* Return FFO in the low word and N in the high word.
+ Note that because of MASK and the shift, the low word
+ is already zero. */
+ return n | ffo;
+}
projects / qemu.git / blobdiff