in lib/usercopy.c [78:142]
unsigned long raw_copy_to_user(void *to, const void *from,
unsigned long n)
{
int w0, w1, w2, w3;
__asm__ __volatile__(
"0: cmpnei %1, 0 \n"
" bf 8f \n"
" mov %3, %1 \n"
" or %3, %2 \n"
" andi %3, 3 \n"
" cmpnei %3, 0 \n"
" bf 1f \n"
" br 5f \n"
"1: cmplti %0, 16 \n" /* 4W */
" bt 3f \n"
" ldw %3, (%2, 0) \n"
" ldw %4, (%2, 4) \n"
" ldw %5, (%2, 8) \n"
" ldw %6, (%2, 12) \n"
"2: stw %3, (%1, 0) \n"
"9: stw %4, (%1, 4) \n"
"10: stw %5, (%1, 8) \n"
"11: stw %6, (%1, 12) \n"
" addi %2, 16 \n"
" addi %1, 16 \n"
" subi %0, 16 \n"
" br 1b \n"
"3: cmplti %0, 4 \n" /* 1W */
" bt 5f \n"
" ldw %3, (%2, 0) \n"
"4: stw %3, (%1, 0) \n"
" addi %2, 4 \n"
" addi %1, 4 \n"
" subi %0, 4 \n"
" br 3b \n"
"5: cmpnei %0, 0 \n" /* 1B */
" bf 13f \n"
" ldb %3, (%2, 0) \n"
"6: stb %3, (%1, 0) \n"
" addi %2, 1 \n"
" addi %1, 1 \n"
" subi %0, 1 \n"
" br 5b \n"
"7: subi %0, 4 \n"
"8: subi %0, 4 \n"
"12: subi %0, 4 \n"
" br 13f \n"
".section __ex_table, \"a\" \n"
".align 2 \n"
".long 2b, 13f \n"
".long 4b, 13f \n"
".long 6b, 13f \n"
".long 9b, 12b \n"
".long 10b, 8b \n"
".long 11b, 7b \n"
".previous \n"
"13: \n"
: "=r"(n), "=r"(to), "=r"(from), "=r"(w0),
"=r"(w1), "=r"(w2), "=r"(w3)
: "0"(n), "1"(to), "2"(from)
: "memory");
return n;
}