Hello Norbert, thanks for the warning. On 2014-01-29 20:50, Norbert Lange wrote:
its been some time since I looked at the TLS conventions and I only done this on ARM. But I would strongly advise you to implement the function in asm, on ARM you arent allowed to change any register except the one you return and I would bet its the same on other architectures.
Yes, this is true for ARM, here __aeabi_read_tp() can clobber only r0. On m68k the situation is different:
https://lists.debian.org/debian-68k/2007/11/msg00071.html "This TLS ABI defines a function __m68k_read_tp, provided by libc. This returns the thread pointer in register a0 (not d0) and may clobber other call-clobbered registers. The compiler will generate calls to this function for the initial exec and local exec models." -- Sebastian Huber, embedded brains GmbH Address : Dornierstr. 4, D-82178 Puchheim, Germany Phone : +49 89 189 47 41-16 Fax : +49 89 189 47 41-09 E-Mail : sebastian.huber@xxxxxxxxxxxxxxxxxx PGP : Public key available on request. Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
