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| 21 | <div class="titlepage"><div><div><h1 class="title"> |
| 22 | <a name="dist.readme-s390"></a>8. README.S390</h1></div></div></div> |
| 23 | <div class="literallayout"><p><br> |
| 24 | <br> |
| 25 | Requirements<br> |
| 26 | ------------<br> |
| 27 | - You need GCC 3.4 or later to compile the s390 port.<br> |
| 28 | - To run valgrind a z10 machine or any later model is recommended.<br> |
| 29 | Older machine models down to and including z990 may work but have<br> |
| 30 | not been tested extensively.<br> |
| 31 | <br> |
| 32 | <br> |
| 33 | Limitations<br> |
| 34 | -----------<br> |
| 35 | - 31-bit client programs are not supported.<br> |
| 36 | - Hexadecimal floating point is not supported.<br> |
| 37 | - Transactional memory is not supported.<br> |
| 38 | - Instructions operating on vector registers are not supported.<br> |
| 39 | - memcheck, cachegrind, drd, helgrind, massif, lackey, and none are<br> |
| 40 | supported. <br> |
| 41 | - On machine models predating z10, cachegrind will assume a z10 cache<br> |
| 42 | architecture. Otherwise, cachegrind will query the hosts cache system<br> |
| 43 | and use those parameters.<br> |
| 44 | - callgrind and all experimental tools are currently not supported.<br> |
| 45 | - Some gcc versions use mvc to copy 4/8 byte values. This will affect<br> |
| 46 | certain debug messages. For example, memcheck will complain about<br> |
| 47 | 4 one-byte reads/writes instead of just a single read/write.<br> |
| 48 | - The transactional-execution facility is not supported; it is masked<br> |
| 49 | off from HWCAP.<br> |
| 50 | - The vector facility is not supported; it is masked off from HWCAP.<br> |
| 51 | <br> |
| 52 | <br> |
| 53 | Hardware facilities<br> |
| 54 | -------------------<br> |
| 55 | Valgrind does not require that the host machine has the same hardware<br> |
| 56 | facilities as the machine for which the client program was compiled.<br> |
| 57 | This is convenient. If possible, the JIT compiler will translate the<br> |
| 58 | client instructions according to the facilities available on the host.<br> |
| 59 | This means, though, that probing for hardware facilities by issuing<br> |
| 60 | instructions from that facility and observing whether SIGILL is thrown<br> |
| 61 | may not work. As a consequence, programs that attempt to do so may<br> |
| 62 | behave differently. It is believed that this is a rare use case.<br> |
| 63 | <br> |
| 64 | <br> |
| 65 | Recommendations<br> |
| 66 | ---------------<br> |
| 67 | Applications should be compiled with -fno-builtin to avoid<br> |
| 68 | false positives due to builtin string operations when running memcheck.<br> |
| 69 | <br> |
| 70 | <br> |
| 71 | Reading Material<br> |
| 72 | ----------------<br> |
| 73 | (1) Linux for zSeries ELF ABI Supplement<br> |
| 74 | http://refspecs.linuxfoundation.org/ELF/zSeries/index.html<br> |
| 75 | (2) z/Architecture Principles of Operation<br> |
| 76 | http://publibfi.boulder.ibm.com/epubs/pdf/dz9zr010.pdf<br> |
| 77 | (3) z/Architecture Reference Summary<br> |
| 78 | http://publibfi.boulder.ibm.com/epubs/pdf/dz9zs008.pdf<br> |
| 79 | <br> |
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