Date: Thu, 23 May 2013 09:38:36 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Bruce Evans <brde@optusnet.com.au> Cc: numerics@freebsd.org Subject: Re: gdb displays xmm registers poorly on amd64, but works on i386 Message-ID: <20130523063836.GT3047@kib.kiev.ua> In-Reply-To: <20130522122836.H1038@besplex.bde.org> References: <20130522122836.H1038@besplex.bde.org>
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--4s9hgdIji3nAkoPB Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wed, May 22, 2013 at 01:16:14PM +1000, Bruce Evans wrote: > gdb displays all the types even on i386 running FreeBSD-~5.2, where ptrace > stuff for xmm and i387 registers is different and more deficient than now. > I think tags translation for i387 registers is still missing in the kernel. > However, for some versions of the kernel on some arches, gdb never fetches > the i387 registers directly from the kernel, but fetches the xmm registers > and does its own translation of everything including tags to i387. The > poor display might be caused by ifdef tangles related to this. The gdb 7.6 on amd64 displays all representations of the xmm registers, as well as decodes the mxcsr bits: xmm0 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000} ... mxcsr 0x1f80 [ IM DM ZM OM UM PM ] I did not verified if the last gdb learned to display YMM on AVX-capable kernels, both for 32 and 64 bits. --4s9hgdIji3nAkoPB Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.20 (FreeBSD) iQIcBAEBAgAGBQJRnblrAAoJEJDCuSvBvK1BsuIP/RPFa3fta2h9yHWi2CDAs4xP 3EuzKne3D3XRL7iRuzv+bPYJVIgBEc3tBQmftDY3NgwlecfsCliyNVp04i+s+zF5 bNuIchePDP9Kg49GwYqKzMsnYDEuO31Te+6fvSRXDLPfBqvl8qLrq+bVBYGDgRag LhQAc+IvDCsJnhtWk5ze6ORNoUlScp1ZTmKZ1l/gNuPHaJJQbaT6ViLZt7HqLdju 0zlOmm+9nvyDmpWz8vBZ2BH9wJbK25RxPX2KnNYyKVLmYauYGSrSnDp5fj5jn+Rx d0b2opyytktKvy8n4TuA0i2ORIJhjLUsyjKxbhHO4Eoe5vMi9rZmISVO+kgGWTtE oulHET9iM6kAbYIthPFb98pWX/NrQO1HLK4/BV17iEe1yVnO2BoV8wJ3Ekhn94tq nTbNnbMtfXd7exxtwzp2htbubBDbC9TCuSEq17oZ/5JbL06xviACHRUKVgOiVRLv DjTQjFWQBv2qGnFQFEA7G6gQ++Ih2aMwEN/ApEN57ONmptcPCJZ4v0kOrM60xlAM B6HzJVwaXiz1SwGX67PTZUVGCMGZqI/lZ/Rq/DsrhZGS24OwElqeMInrpTZGPTP2 qMFiHoLTEpaYIIVKbj9DUd1/5GpiFlO0d0mAHiXZOYf9mrBhwqZ7MBBwGusD0u2o RkrEAoSnld1DyhOd8Cgn =gFfe -----END PGP SIGNATURE----- --4s9hgdIji3nAkoPB--
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