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| author | Nick Clifton <nickc@redhat.com> | 2015-04-09 09:20:00 +0100 |
|---|---|---|
| committer | Corinna Vinschen <corinna@vinschen.de> | 2015-04-23 21:57:13 +0200 |
| commit | cd0d45913525ef09f0494a2f0c8e3d6fe8fface2 (patch) | |
| tree | dcbb6a0c97dc45cc7df625cbeb4d1a99f503d247 /newlib/libc/machine/rx/mempcpy.S | |
| parent | 45d0b17928067ee848aae2cd5bd332129ca35c42 (diff) | |
| download | cygnal-cd0d45913525ef09f0494a2f0c8e3d6fe8fface2.tar.gz cygnal-cd0d45913525ef09f0494a2f0c8e3d6fe8fface2.tar.bz2 cygnal-cd0d45913525ef09f0494a2f0c8e3d6fe8fface2.zip | |
For the RX port, avoid using string instructions when __RX_DISALLOW_STRING_INSNS__ is defined.
* rx/crt0.S (_start): If string instructions are not allowed,
avoid using SMOVF.
* libc/machine/rx/memchr.S: Add non-string insn using version.
* libc/machine/rx/memcpy.S: Likewise.
* libc/machine/rx/memmove.S: Likewise.
* libc/machine/rx/mempcpy.S: Likewise.
* libc/machine/rx/strcat.S: Likewise.
* libc/machine/rx/strcmp.S: Likewise.
* libc/machine/rx/strcpy.S: Likewise.
* libc/machine/rx/strlen.S: Likewise.
* libc/machine/rx/strncat.S: Likewise.
* libc/machine/rx/strncmp.S: Likewise.
* libc/machine/rx/strncpy.S: Likewise.
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 |