projects / thirdparty / valgrind.git / blame
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|---|---|---|
| af3ca30a | 1 | |
| 6107fd66 JS |
2 | Requirements |
| 3 | ------------ | |
| 4 | - You need GCC 3.4 or later to compile the s390 port. | |
| d2039281 FK |
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 | |
| e6e402ce | 7 | not been tested extensively. |
| 6107fd66 JS |
8 | |
| 9 | ||
| 10 | Limitations | |
| 11 | ----------- | |
| 12 | - 31-bit client programs are not supported. | |
| 13 | - Hexadecimal floating point is not supported. | |
| e83c28e1 AA |
14 | - Transactional memory is not supported. The transactional-execution |
| 15 | facility is masked off from HWCAP. | |
| afa21cd6 AA |
16 | - A full list of unimplemented instructions can be retrieved from |
| 17 | `docs/internals/s390-opcodes.csv', by grepping for "not implemented". | |
| e83c28e1 AA |
18 | - FP signalling is not accurate. E.g., the "compare and signal" |
| 19 | instructions behave like their non-signalling counterparts. | |
| e6e402ce FK |
20 | - On machine models predating z10, cachegrind will assume a z10 cache |
| 21 | architecture. Otherwise, cachegrind will query the hosts cache system | |
| 22 | and use those parameters. | |
| 4035c74f FK |
23 | - Some gcc versions use mvc to copy 4/8 byte values. This will affect |
| 24 | certain debug messages. For example, memcheck will complain about | |
| 25 | 4 one-byte reads/writes instead of just a single read/write. | |
| 6107fd66 JS |
26 | |
| 27 | ||
| 978fa74f FK |
28 | Hardware facilities |
| 29 | ------------------- | |
| 30 | Valgrind does not require that the host machine has the same hardware | |
| 31 | facilities as the machine for which the client program was compiled. | |
| d2039281 FK |
32 | This is convenient. If possible, the JIT compiler will translate the |
| 33 | client instructions according to the facilities available on the host. | |
| 978fa74f FK |
34 | This means, though, that probing for hardware facilities by issuing |
| 35 | instructions from that facility and observing whether SIGILL is thrown | |
| 36 | may not work. As a consequence, programs that attempt to do so may | |
| 37 | behave differently. It is believed that this is a rare use case. | |
| 38 | ||
| 39 | ||
| 6107fd66 JS |
40 | Reading Material |
| 41 | ---------------- | |
| ce4b0e06 AA |
42 | (1) ELF ABI s390x Supplement |
| 43 | https://github.com/IBM/s390x-abi/releases | |
| 6107fd66 | 44 | (2) z/Architecture Principles of Operation |
| afa21cd6 | 45 | https://www.ibm.com/support/pages/zarchitecture-principles-operation |
| 6107fd66 | 46 | (3) z/Architecture Reference Summary |
| afa21cd6 | 47 | https://www.ibm.com/support/pages/zarchitecture-reference-summary |