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Thu, 09 Apr 2020 02:59:03 +0200 Subject: Re: [PATCH v2] Add SVR4 psABI specific parser for AUXV entries To: Simon Marchi , gdb-patches@sourceware.org Cc: tom@tromey.com, jhb@FreeBSD.org References: <20200408021426.28406-1-n54@gmx.com> <20200408145832.24243-1-n54@gmx.com> <46801343-faf4-7db0-5dbe-35bd23b14603@simark.ca> From: Kamil Rytarowski Autocrypt: addr=n54@gmx.com; prefer-encrypt=mutual; keydata= mQINBFVwUF8BEADHmOg7PFLIcSDdMx5HNDYr8MY2ExGfUTrKwPndbt3peaa5lHsK+UGoPG48 KiWkhEaMmjaXHFa7XgVpJHhFmNoJXfPgjI/sOKTMCPQ5DEHEHTibC4mta7IBAk+rmnaOF0k8 bxHfP8Qbls66wvicrAfTRXn/1ReeNc3NP4Sq39PoVHkfQTlnQiD4eAqBdq61B7DhzjhbKAZ4 RsNtLfB6eOv9qvmblUzs50ChYewM9hvn+c7MdDH+x2UXoSDhkBDkKcJGkX91evos8s9AuoEd D32X5e+bmdUGe8Cr3cAZJ8IEXR6F9828/kxzPliMsCWVRx1Fr28baCJOUGgFPNr3ips78m9+ Iw8PdQ101jU0dvucDFxw/1SCGYEZzV+O/237oRPuLCiDX5nhQoxf6dn9ukQleLBMNy2BLI4H g342NhF21HLA+KlyLOHaMKQCKzlal+zVNZTRTCh/ikMhsxWQjBfnqTDbMj85DnWwtump27SI qhPjUnS0a6MKoS/A+hbi64k5zztkvloELfCSrX7NyBTT0jgF2IGFIxZMrKCtQ9StcGMCV9MX tjcBy6fj7QMontEaIDRJEMjg8UIGw1B687OhalOv1ISia4xOWvpYAM6ipgqh6tBQmFzasL9P h1RtcVdFpFbhwVlr1Bly8c25gBNQHL5GUjLMn45LlQz50OzrkwARAQABtCdLYW1pbCBSeXRh cm93c2tpIChOZXRCU0QpIDxuNTRAZ214LmNvbT6JAjwEEwEIACYCGyMHCwkIBwMCAQYVCAIJ CgsEFgIDAQIeAQIXgAUCVbKGFwIZAQAKCRBLswjpsC52bIVpD/9i8npieI91xMIVvAHIUMeo cQO0IrNb+b/PuTj2qNemdwU7dhVJ7tVU5O1H2hI2M4rHGzjzDTxYzdxka0+A8CVEuvFdf6sF lXlXF0wM7rC6MoaB0QLAKxkZB5OtCILxLx7Bl2Y4cTPMU9v+qSL6yrdmhxogkufa4d6O9Zl/ FCWO2kH/BphKOiDtbyvdo2WULSLWP2IXN+0rCpNL4wbTfYLgV9JtMf8f0naGsdy7BFuDWsIE vtHh8dkQZP7dz6Qy67kx8negZaehSEgXwiae0HwQIn3xTQrFmBDALDsCgXuLWPTvglSkqTak uG+8X5fyTy0cU10TNKsU+rFBO+/xsUoIQOGrARwfWOIfJNPelzh/qigSnyNQNH8u5vFRPg9n fqB/AcvvAvtOYOo8EN9Ofx11gNj397NXc5HBQTrX6k5GNAeBWE3Ng1uO6scIwAS7qGnqGezU ABmQKLN37gmJiiGwhQAnSE6HILLBC5Z2b0S2rQsPKg8WgUmPa1YIcDkDtNB/LJcDsdU4Fm+r U2ksKU7tGD2ZfBt8H2nqfPKKeB+Uv/TBigjRvx/m70vjhqVxwCZA9Fqr9vkQkZroNfqP+3dp Z5V5fjmxO5abE2+IikSvFagwMtgx56i8Yrr2BzE8P5/S4cKq1kgyQoF+lVGDKRkUKCv1i4Fo aftnSxN8jTFZDbkCDQRVcFBfARAAutbzb8wAHGL5FPPWKErQ3Bsrp9RDTVqRzp7kBMOtd/14 MrOsWWyiml4XnvBYsJuhZWomFoeulcOXAPoTJ2vTw6erWYtdOiZymfQ3GMWpxzgkOVeNjsFF 9AQ38FCMKmIDs9dgn+KXSIXlZA34khKLd163SN5U/KHfYlnnocec31u+7rVa1hlF5DBSSpoi s8cs41foBYC5NsB/i+yqGIlfzHy7pC2u5kyQCuJotLH4y0rT5X+YBC7z7cqKChtILNDGw0ht qps29fwOGBE/FWmu8CbpSHj8pvg7uUyQcKbZbNChBfWtOJKdjnNs5VHf2ec95SwYmWl6Xz66 G892HY4ODtvl05/kh0qtdJd2oI4gJBsBx/N1585/3JYN4k78GIHTnML3xJydRRs9wwM3AXf/ iDGrMyY7qHQVXJLdO5nPe7LHg48vryCMkBnTMw5iNFPVCu5w1BaZyHxuS2HvpsgUtQoBa2QE P1jYNI+2qgoiIG4VQDhYtrD0WJaYdi/C2UVDxRy07dt73SV3RQ7ijOiUrz4g3/deFKY16/1k sE+N5Sc5Tjt84ChjO3nJRbHrQxd6dCOElR70e3R2yAuSB4m7LJpO20IB9CtWhlF/0AtfL91W O8GGGqLWB0Z04hmwRs/l8T4WWIlykLshbunWN6jsP1Y27FeilTZ+Pc9mYOEUFfEAEQEAAYkC HwQYAQgACQUCVXBQXwIbDAAKCRBLswjpsC52bPayD/9jE8mdNudrudSxbDB2vf8pU8r5flCq vIkfOdpZGV/Wx/Zx+HFHHp+b2aNBGSNyFTnph1Ku9bvg06vD0o+b7SdA1vrBgRG41t0OCIyf vejz65Xpin2EtCllcBM8zUCxHo43blON8fNw70P1Ec0loBp4TAal1MiXbB8kxRTRcEPVO9YF 9NPsFxycoWl0ZSvu4ESrQlrjRbVv+W0Fy/XqcQwEtDziFQHQXNRbTy8INPD49CsB7BkKRK+f 1vMmw7SxfsyEhyCgo9ZWfHb/+w9T5h+UhF87L/m287z7W+s4aCAPBzjbIWhtngGJJwIgiWdI I9J6YJLcHLvVZLw7xzA/flcjc0VfzOgJOJw3hBukHnEz7/CKgnABwyNu52P+PQbxVTiTjMKm 06eV732u9ZLD9ZgEazfmyGDHzsuzoXwsRnmcnbwYYAiynS+vfGl5oMtMa5qzsPhlzuvRlXHm zr8VjF8c9RThvyZyyHtWYAqNmBecMvM0whigjMeoAMJ5LtpyZgxjbHj1XnVdNBZgfJkOzsc/ twffi7RYphRx0d9z5UZ1Yl5Rvl05vTaJ7YhhNC7xuE8yGOQmDUsPDwWqO/eXUDErJjCOBR5b 0yILqRPYNT0Fj/th9gtEbZy1Gp0TVBkZM3tfjDRu43Pn6iSKObO/j0rNuq1LwN/EMxDifeZO 4XSbcg== Message-ID: Date: Thu, 9 Apr 2020 02:57:50 +0200 User-Agent: Mozilla/5.0 (X11; NetBSD amd64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <46801343-faf4-7db0-5dbe-35bd23b14603@simark.ca> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:O/Pvn/hTG9FMI90wpUWQRB0Cluh/KtWG9J6TGtoM2/O5WlabyYt nMIqwc+g4DYbzjM2m0uy4aD4khpH/2yXBc0Z2+sX6vfy3ZEvvUXO1j98T7FpW1ZNn3PcXLv E9PdrimTJYSbOPnjHZMPWwMSIQ0bUPGhs6s6oo0RglAXi7D0ab3usRAGXztNHRcSRinFvke By0O3H5v6AJ6/wjUf4efw== X-UI-Out-Filterresults: notjunk:1;V03:K0:c994TFXS0pk=:Cq7XLqdbks21awsD3vrWNP xrW8NxcTigRrKyOCTNfQeGM+KAGJ51a4NI8adpm5+5L/V4klP7Gzg1yI+iptzNj5cRa3/NUe8 GGVAoWUxSsyUAhqHVEu8AtXNIUmA0KHeKk3bgtWpsuwVkQZiaTw/CxlQmWnIlP20EB2wEhq0D tWYZUgFTZWm5xvX0zgRBQTYYtgpVHmlYBxHiinTMIkJg4+K2KEz5GEX+O0LBqaNFAFZASEcw7 rVIWUCPbOd1NdMsNfZGZ8ezjP+gSvhQb6La6N9ARjpPOwCl518G4T9lEqG35bYafWx+kJw0bN 01yhCzA32noGv//d798ol5CAcngtL3QiL+hvIrInDnxKq7ta8NoqXIdmNNlQPBiCbrpZxwC1i 6PJt91aU6r3RVqgtVP2xQPP+6u2Xq8UDtNntmwqXs5SutkadHvCPWU+lVvKA1OLK/00CdAiEK pgPxEGzCaJCQllhzwiP4N2tTbNk8ntRUSg5IHk8SFzy0/ZqcJJDhSZ/ahWEVRqpyn7iLkAmg1 GBxpSlRfNSntt868F0SJW0mO3AK8KTVai5VLBdd8QvaGYr4X//WD49fMmGoo29RkDPC1V6Mqm dNpmBiqyGTstqui0p1K5tm0E5HUSG/h+1sOzBQUVovLmQitFtePedhY3ezHA1OfALn8TLIy4h pdGrHob7JvIzyoh6dr6I59m2qH5DeQ2xt0LtAnFm9OIxuWdtlUmpVCfYF6R0hDXEmi7HWQWl6 3Cy899n9/u5jnZ/NXomxrGZtQekgISZRuz2y1OG0/MvAYJzY8AsmacIEvX4t1m4If8BdZUz7Z PEEx11Y/IQbUZbFxFwBX38W6rOViezL6wH2HvIWauPL5O7f7LW3u0xbXUCnuBOhA6o2WEZMbR KOsieHj+TU0jj1563og9MSPIPZCbuykufhy9fIMzQf+urvIBO9YUEf9Dwb2CW40FA9iCr9aZD x8Icy2XKjCpelsmvk7HFyqCFqR6oRF3aFuwyOXyGbvfvRlM+x4PtY3KUAbbNEG3t6EsE1OCIt JBUVePXt5LnLb9wx+UJcZq/EtGIoQpAJmbXiaPFBvTBCSInDeKXPogkRR8qF/mjuyqBBeTku9 JRmntQnqd0a/pGUbZedYHDFkeOd48fLTHN3Mm0NYzbbNce0ZLgPte1pATj89O+kmVbgcE6jyt n2nONS0yX/tQKOkf89gokHa3v/mK11geTnYFSztBzw8peNOa/9Ymy7dwzgpVhOylLjxmM= X-Spam-Status: No, score=-28.5 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FROM, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_DNSWL_LOW, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 09 Apr 2020 00:59:24 -0000 On 09.04.2020 02:04, Simon Marchi wrote: >> diff --git a/gdb/auxv.c b/gdb/auxv.c >> index c13d7a22eb9..28e8d2f704d 100644 >> --- a/gdb/auxv.c >> +++ b/gdb/auxv.c >> @@ -248,34 +248,65 @@ memory_xfer_auxv (struct target_ops *ops, >> return procfs_xfer_auxv (readbuf, writebuf, offset, len, xfered_len)= ; >> } >> >> -/* Read one auxv entry from *READPTR, not reading locations >=3D ENDPT= R. >> - Return 0 if *READPTR is already at the end of the buffer. >> - Return -1 if there is insufficient buffer for a whole entry. >> - Return 1 if an entry was read into *TYPEP and *VALP. */ >> -int >> -default_auxv_parse (struct target_ops *ops, gdb_byte **readptr, >> - gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) >> +/* This function compared to other auxv_parse functions: it takes the = size of >> + the auxv type field as a parameter. */ >> + >> +static int >> +generic_auxv_parse (struct gdbarch *gdbarch, gdb_byte **readptr, >> + gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp, >> + int sizeof_auxv_type) >> { >> - const int sizeof_auxv_field =3D gdbarch_ptr_bit (target_gdbarch ()) >> - / TARGET_CHAR_BIT; >> - const enum bfd_endian byte_order =3D gdbarch_byte_order (target_gdba= rch ()); >> + struct type *ptr_type =3D builtin_type (gdbarch)->builtin_data_ptr; >> + const int sizeof_auxv_val =3D TYPE_LENGTH (ptr_type); >> + enum bfd_endian byte_order =3D gdbarch_byte_order (gdbarch); >> gdb_byte *ptr =3D *readptr; >> >> if (endptr =3D=3D ptr) >> return 0; >> >> - if (endptr - ptr < sizeof_auxv_field * 2) >> + if (endptr - ptr < 2 * sizeof_auxv_val) >> return -1; >> >> - *typep =3D extract_unsigned_integer (ptr, sizeof_auxv_field, byte_or= der); >> - ptr +=3D sizeof_auxv_field; >> - *valp =3D extract_unsigned_integer (ptr, sizeof_auxv_field, byte_ord= er); >> - ptr +=3D sizeof_auxv_field; >> + *typep =3D extract_unsigned_integer (ptr, sizeof_auxv_type, byte_ord= er); >> + /* Even if the auxv type takes less space than an auxv value, there = is >> + padding after the type such that the value is aligned on a multip= le of >> + its size (and this is why we advance by `sizeof_auxv_val` and not >> + `sizeof_auxv_type`. */ > > The parenthesis in the comment is not closed. > Fixed. >> diff --git a/gdb/auxv.h b/gdb/auxv.h >> index a5a932ec80e..c1d11ea2c7b 100644 >> --- a/gdb/auxv.h >> +++ b/gdb/auxv.h >> @@ -25,12 +25,27 @@ >> /* See "include/elf/common.h" for the definition of valid AT_* values.= */ >> >> /* The default implementation of to_auxv_parse, used by the target >> - stack. */ >> + stack. >> >> + Read one auxv entry from *READPTR, not reading locations >=3D ENDPT= R. >> + Return 0 if *READPTR is already at the end of the buffer. >> + Return -1 if there is insufficient buffer for a whole entry. >> + Return 1 if an entry was read into *TYPEP and *VALP. */ >> extern int default_auxv_parse (struct target_ops *ops, gdb_byte **read= ptr, >> gdb_byte *endptr, CORE_ADDR *typep, >> CORE_ADDR *valp); >> >> +/* The SVR4 psABI implementation of to_auxv_parse, that uses an int to >> + store the type rather than long as assumed by the default parser. >> + >> + Read one auxv entry from *READPTR, not reading locations >=3D ENDPT= R. >> + Return 0 if *READPTR is already at the end of the buffer. >> + Return -1 if there is insufficient buffer for a whole entry. >> + Return 1 if an entry was read into *TYPEP and *VALP. */ >> +extern int svr4_auxv_parse (struct gdbarch *gdbarch, gdb_byte **readpt= r, >> + gdb_byte *endptr, CORE_ADDR *typep, >> + CORE_ADDR *valp); > > The last two lines are not properly aligned on the parenthesis. > Fixed. > Simon > Please see v3.