1 2 Requirements 3 ------------ 4 - You need GCC 3.4 or later to compile the s390 port. 5 - To run valgrind a z10 machine or any later model is recommended. 6 Older machine models down to and including z990 may work but have 7 not been tested extensively. 8 9 10 Limitations 11 ----------- 12 - 31-bit client programs are not supported. 13 - Hexadecimal floating point is not supported. 14 - Transactional memory is not supported. 15 - Instructions operating on vector registers are not supported. 16 - memcheck, cachegrind, drd, helgrind, massif, lackey, and none are 17 supported. 18 - On machine models predating z10, cachegrind will assume a z10 cache 19 architecture. Otherwise, cachegrind will query the hosts cache system 20 and use those parameters. 21 - callgrind and all experimental tools are currently not supported. 22 - Some gcc versions use mvc to copy 4/8 byte values. This will affect 23 certain debug messages. For example, memcheck will complain about 24 4 one-byte reads/writes instead of just a single read/write. 25 - The transactional-execution facility is not supported; it is masked 26 off from HWCAP. 27 - The vector facility is not supported; it is masked off from HWCAP. 28 29 30 Hardware facilities 31 ------------------- 32 Valgrind does not require that the host machine has the same hardware 33 facilities as the machine for which the client program was compiled. 34 This is convenient. If possible, the JIT compiler will translate the 35 client instructions according to the facilities available on the host. 36 This means, though, that probing for hardware facilities by issuing 37 instructions from that facility and observing whether SIGILL is thrown 38 may not work. As a consequence, programs that attempt to do so may 39 behave differently. It is believed that this is a rare use case. 40 41 42 Recommendations 43 --------------- 44 Applications should be compiled with -fno-builtin to avoid 45 false positives due to builtin string operations when running memcheck. 46 47 48 Reading Material 49 ---------------- 50 (1) Linux for zSeries ELF ABI Supplement 51 http://refspecs.linuxfoundation.org/ELF/zSeries/index.html 52 (2) z/Architecture Principles of Operation 53 http://publibfi.boulder.ibm.com/epubs/pdf/dz9zr010.pdf 54 (3) z/Architecture Reference Summary 55 http://publibfi.boulder.ibm.com/epubs/pdf/dz9zs008.pdf 56
