+:function:::unsigned_word:do_load_left:unsigned access, address_word base, address_word offset, unsigned_word rt
+{
+ address_word mask = (WITH_TARGET_WORD_BITSIZE == 64 ? 0x7 : 0x3);
+ address_word reverseendian = (ReverseEndian ? -1 : 0);
+ address_word bigendiancpu = (BigEndianCPU ? -1 : 0);
+ unsigned int byte;
+ unsigned int word;
+ address_word paddr;
+ int uncached;
+ unsigned64 memval;
+ address_word vaddr;
+ int nr_lhs_bits;
+ int nr_rhs_bits;
+ unsigned_word lhs_mask;
+ unsigned_word temp;
+
+ vaddr = loadstore_ea (SD_, base, offset);
+ AddressTranslation (vaddr, isDATA, isLOAD, &paddr, &uncached, isTARGET, isREAL);
+ paddr = (paddr ^ (reverseendian & mask));
+ if (BigEndianMem == 0)
+ paddr = paddr & ~access;
+
+ /* compute where within the word/mem we are */
+ byte = ((vaddr ^ bigendiancpu) & access); /* 0..access */
+ word = ((vaddr ^ bigendiancpu) & (mask & ~access)) / (access + 1); /* 0..1 */
+ nr_lhs_bits = 8 * byte + 8;
+ nr_rhs_bits = 8 * access - 8 * byte;
+ /* nr_lhs_bits + nr_rhs_bits == 8 * (accesss + 1) */
+
+ /* fprintf (stderr, "l[wd]l: 0x%08lx%08lx 0x%08lx%08lx %d:%d %d+%d\n",
+ (long) ((unsigned64) vaddr >> 32), (long) vaddr,
+ (long) ((unsigned64) paddr >> 32), (long) paddr,
+ word, byte, nr_lhs_bits, nr_rhs_bits); */
+
+ LoadMemory (&memval, NULL, uncached, byte, paddr, vaddr, isDATA, isREAL);
+ if (word == 0)
+ {
+ /* GPR{31..32-NR_LHS_BITS} = memval{NR_LHS_BITS-1..0} */
+ temp = (memval << nr_rhs_bits);
+ }
+ else
+ {
+ /* GPR{31..32-NR_LHS_BITS = memval{32+NR_LHS_BITS..32} */
+ temp = (memval >> nr_lhs_bits);
+ }
+ lhs_mask = LSMASK (nr_lhs_bits + nr_rhs_bits - 1, nr_rhs_bits);
+ rt = (rt & ~lhs_mask) | (temp & lhs_mask);
+
+ /* fprintf (stderr, "l[wd]l: 0x%08lx%08lx -> 0x%08lx%08lx & 0x%08lx%08lx -> 0x%08lx%08lx\n",
+ (long) ((unsigned64) memval >> 32), (long) memval,
+ (long) ((unsigned64) temp >> 32), (long) temp,
+ (long) ((unsigned64) lhs_mask >> 32), (long) lhs_mask,
+ (long) (rt >> 32), (long) rt); */
+ return rt;
+}
+
+:function:::unsigned_word:do_load_right:unsigned access, address_word base, address_word offset, unsigned_word rt
+{
+ address_word mask = (WITH_TARGET_WORD_BITSIZE == 64 ? 0x7 : 0x3);
+ address_word reverseendian = (ReverseEndian ? -1 : 0);
+ address_word bigendiancpu = (BigEndianCPU ? -1 : 0);
+ unsigned int byte;
+ address_word paddr;
+ int uncached;
+ unsigned64 memval;
+ address_word vaddr;
+
+ vaddr = loadstore_ea (SD_, base, offset);
+ AddressTranslation (vaddr, isDATA, isLOAD, &paddr, &uncached, isTARGET, isREAL);
+ /* NOTE: SPEC is wrong, has `BigEndianMem == 0' not `BigEndianMem != 0' */
+ paddr = (paddr ^ (reverseendian & mask));
+ if (BigEndianMem != 0)
+ paddr = paddr & ~access;
+ byte = ((vaddr & mask) ^ (bigendiancpu & mask));
+ /* NOTE: SPEC is wrong, had `byte' not `access - byte'. See SW. */
+ LoadMemory (&memval, NULL, uncached, access - (access & byte), paddr, vaddr, isDATA, isREAL);
+ /* printf ("lr: 0x%08lx %d@0x%08lx 0x%08lx\n",
+ (long) paddr, byte, (long) paddr, (long) memval); */
+ {
+ unsigned_word screen = LSMASK (8 * (access - (byte & access) + 1) - 1, 0);
+ rt &= ~screen;
+ rt |= (memval >> (8 * byte)) & screen;
+ }
+ return rt;
+}
+
+
+100000,5.BASE,5.RT,16.OFFSET:NORMAL:32::LB
+"lb r<RT>, <OFFSET>(r<BASE>)"
+*mipsI:
+*mipsII:
+*mipsIII:
+*mipsIV:
+*mipsV:
+*mips32:
+*mips64: