Blue Swirl a écrit : >> According to the SPARCv8 and SPARCv9 manuals, the jmpl, rett and return >> instructions should generate a mem_address_not_aligned trap if either >> of the low-order two bits of the target address is nonzero. > > This is true, but in that case alignment should be enforced for loads ands > stores as well. The checks also incur a performance penalty for little > advantage. Maybe the checks should be enabled only with a compile/run-time > option. >
I also have a patch for load/store, but openbios is doing a few unaligned memory accesses, so the patch can't be used until openbios is fixed. I haven't made any benchmark, but the performance penality is probably very small. If you look at softmmu_template.h, you will see that it only adds a if test, while the whole function is already a few dozen of lines long. I would really like to see the QEMU having the same behaviour as real hardware, this allow for example debugging SIGBUS problems in a program without having real hardware. -- .''`. Aurelien Jarno | GPG: 1024D/F1BCDB73 : :' : Debian developer | Electrical Engineer `. `' [EMAIL PROTECTED] | [EMAIL PROTECTED] `- people.debian.org/~aurel32 | www.aurel32.net
