diff options
Diffstat (limited to 'newlib/libc/machine/rx/mempcpy.S')
| -rw-r--r-- | newlib/libc/machine/rx/mempcpy.S | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/newlib/libc/machine/rx/mempcpy.S b/newlib/libc/machine/rx/mempcpy.S index c679d04ce..f82452462 100644 --- a/newlib/libc/machine/rx/mempcpy.S +++ b/newlib/libc/machine/rx/mempcpy.S @@ -4,5 +4,22 @@ .global _mempcpy .type _mempcpy,@function _mempcpy: +#ifdef __RX_DISALLOW_STRING_INSNS__ + /* Do not use the string instructions - they might prefetch + bytes from outside of valid memory. This is particularly + dangerous in I/O space. */ + + cmp #0, r3 ; If the count is zero, do nothing + beq 2f + +1: mov.b [r2+], r5 + mov.b r5, [r1+] + sub #1, r3 + bne 1b + +2: rts +#else smovf rts +#endif + .size _mempcpy, . - _mempcpy |