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From: Petar J. <mip...@gm...> - 2018-04-05 17:05:40
|
On Wed, Apr 4, 2018 at 6:11 PM, John Reiser <jr...@bi...> wrote: >> mips64: use register numbers instead of aliases for inline assembly >> There is an inconsistency in MIPS tools for N32/N64 related to >> register >> aliases. To avoid ambiguity, use register numbers instead of aliases >> where >> needed. > > > Please give URLs or other citations to the differing definitions of t0, > and also an explanation if you can. There may be other places that suffer. > > In short, in MIPS, registers $8-$11 and $12-$15 have different aliases based on the ABI. There is also a mismatch between documents that describe them (in SGI documentation, there are no t0-t3 in N32/64, but these aliases exist for N32/64 in MD00305). Regards, Petar |
|
From: Petar J. <mip...@gm...> - 2018-04-05 13:34:52
|
Hi All, One [1] of the changes at bug #345763 [2] introduces new type called RegWord that should match register width. This becomes important at several places, but mostly in routines that deal with system calls. The change makes sense to me, and I incline towards integrating it into the code, as it seems to make sense (unless I am missing different obvious solution). The patch is, on the other hand, large (though all single hunks are simple and trivial). If someone has opinion, now time to shout. Thanks. Regards, Petar [1] https://bugsfiles.kde.org/attachment.cgi?id=111844 [2] https://bugs.kde.org/show_bug.cgi?id=345763 ---------- Forwarded message ---------- From: Aleksandar Rikalo <bug...@kd...> Date: Thu, Apr 5, 2018 at 2:04 PM Subject: [valgrind] [Bug 345763] MIPS N32 ABI support To: mip...@gm... https://bugs.kde.org/show_bug.cgi?id=345763 Aleksandar Rikalo <ale...@rt...> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |ale...@rt... --- Comment #31 from Aleksandar Rikalo <ale...@rt...> --- Created attachment 111844 --> https://bugs.kde.org/attachment.cgi?id=111844&action=edit Introduce RegWord type On all other architectures size of long matches register width. On mips n32 size of long is 32 bits and register width is 64 bits. Valgrind is written with assumption that long size matches register width. This is reason why both UWord for valgrind and HWord for VEX match size of long. Long size differs from register size on mips n32 ABI. This causes problems in several cases: - For do_syscall arguments is used UWord type. This may cause that 64-bit values lost 32 higher bits. - In several places where Valgrind needs to check size of registers, using long based types, would give incorrect value. There are two possible solutions for these problems: - Change size of HWord or UWord for mips n32 abi- Problem with this solution is that they are already used on great number of places where it is assumed that they match long size. Changing their size would require changes in great number of places, and require new type which matches size of long. Change of this proportion would potentially introduce a great deal of new bugs. - Introduce a new type which will match size of registers on all platforms and use it where necessary, which is implemented in provided patch. This patch has no effect on Valgrind's behavior. |