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GET /api/patches/808480/?format=api
HTTP 200 OK
Allow: GET, PUT, PATCH, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "id": 808480,
    "url": "http://patchwork.ozlabs.org/api/patches/808480/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20170831235123.GA5644@fergus.ozlabs.ibm.com/",
    "project": {
        "id": 2,
        "url": "http://patchwork.ozlabs.org/api/projects/2/?format=api",
        "name": "Linux PPC development",
        "link_name": "linuxppc-dev",
        "list_id": "linuxppc-dev.lists.ozlabs.org",
        "list_email": "linuxppc-dev@lists.ozlabs.org",
        "web_url": "https://github.com/linuxppc/wiki/wiki",
        "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git",
        "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/",
        "list_archive_url": "https://lore.kernel.org/linuxppc-dev/",
        "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/",
        "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}"
    },
    "msgid": "<20170831235123.GA5644@fergus.ozlabs.ibm.com>",
    "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20170831235123.GA5644@fergus.ozlabs.ibm.com/",
    "date": "2017-08-31T23:51:23",
    "name": "[19/17] powerpc: Wrap register number correctly for string load/store instructions",
    "commit_ref": "45f62159f3aafe27e2df45a3ec83b32ca7304410",
    "pull_url": null,
    "state": "accepted",
    "archived": false,
    "hash": "9829530589c18741eef88a5072e7a7154fdfe246",
    "submitter": {
        "id": 67079,
        "url": "http://patchwork.ozlabs.org/api/people/67079/?format=api",
        "name": "Paul Mackerras",
        "email": "paulus@ozlabs.org"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20170831235123.GA5644@fergus.ozlabs.ibm.com/mbox/",
    "series": [
        {
            "id": 522,
            "url": "http://patchwork.ozlabs.org/api/series/522/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=522",
            "date": "2017-08-30T04:12:25",
            "name": "powerpc: Do alignment fixups using analyse_instr etc.",
            "version": 3,
            "mbox": "http://patchwork.ozlabs.org/series/522/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/808480/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/808480/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org>",
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        "Received": [
            "from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\t(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xjzhV22Wjz9s7p\n\tfor <patchwork-incoming@ozlabs.org>;\n\tFri,  1 Sep 2017 09:52:58 +1000 (AEST)",
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        ],
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        ],
        "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=ozlabs.org; s=201707; \n\tt=1504223489; bh=VXn/uK7buypKRdc/1fSzK18EQume6GQDsf3mCAHYWu4=;\n\th=Date:From:To:Subject:References:In-Reply-To:From;\n\tb=cRZ2mReTf4+5GUYIfwCu4gerKxVQ3HMI8C1vAaztZoet8UmNt1eBbFt4fGscLV1D7\n\t2lYhRNmfvrsj/yYN6rleX85Sl/n2BIASSwz67PDHTi6VnJyGq6pRDDfpQwWIGW+3Za\n\tzHrQTEPacL2TB+6hUdSkiOEbOw0DMgn9Hd6zKhNpBArAmjRFcuAKDTt+f5hPsOW4bs\n\tsQH3M1V5OOCtrit6KEeW9FEfma11fH7nTIjsjEibMxAqhBkomOjObWbG0PsP0r5NPZ\n\tOIG+Yn5AXfVZfOD1Eu/zrYL8xugB8wUbAdA0iz5Ea5sd0Kr8hUkEuAT5cAsRwcBU6s\n\tU+s3vEwZ3OXwQ==",
        "Date": "Fri, 1 Sep 2017 09:51:23 +1000",
        "From": "Paul Mackerras <paulus@ozlabs.org>",
        "To": "linuxppc-dev@ozlabs.org",
        "Subject": "[PATCH 19/17] powerpc: Wrap register number correctly for string\n\tload/store instructions",
        "Message-ID": "<20170831235123.GA5644@fergus.ozlabs.ibm.com>",
        "References": "<1504066360-30128-1-git-send-email-paulus@ozlabs.org>",
        "MIME-Version": "1.0",
        "Content-Type": "text/plain; charset=us-ascii",
        "Content-Disposition": "inline",
        "In-Reply-To": "<1504066360-30128-1-git-send-email-paulus@ozlabs.org>",
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        "Precedence": "list",
        "List-Id": "Linux on PowerPC Developers Mail List\n\t<linuxppc-dev.lists.ozlabs.org>",
        "List-Unsubscribe": "<https://lists.ozlabs.org/options/linuxppc-dev>,\n\t<mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>",
        "List-Archive": "<http://lists.ozlabs.org/pipermail/linuxppc-dev/>",
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        "Errors-To": "linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org",
        "Sender": "\"Linuxppc-dev\"\n\t<linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org>"
    },
    "content": "Michael Ellerman reported that emulate_loadstore() was trying to\naccess element 32 of regs->gpr[], which doesn't exist, when\nemulating a string store instruction.  This is because the string\nload and store instructions (lswi, lswx, stswi and stswx) are\ndefined to wrap around from register 31 to register 0 if the number\nof bytes being loaded or stored is sufficiently large.  This wrapping\nwas not implemented in the emulation code.  To fix it, we mask the\nregister number after incrementing it.\n\nReported-by: Michael Ellerman <mpe@ellerman.id.au>\nFixes: c9f6f4ed95d4 (\"powerpc: Implement emulation of string loads and stores\")\nSigned-off-by: Paul Mackerras <paulus@ozlabs.org>\n---\n arch/powerpc/lib/sstep.c | 6 ++++--\n 1 file changed, 4 insertions(+), 2 deletions(-)",
    "diff": "diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c\nindex 2f6897c..c406611 100644\n--- a/arch/powerpc/lib/sstep.c\n+++ b/arch/powerpc/lib/sstep.c\n@@ -2865,7 +2865,8 @@ int emulate_loadstore(struct pt_regs *regs, struct instruction_op *op)\n \t\t\t\tv32 = byterev_4(v32);\n \t\t\tregs->gpr[rd] = v32;\n \t\t\tea += 4;\n-\t\t\t++rd;\n+\t\t\t/* reg number wraps from 31 to 0 for lsw[ix] */\n+\t\t\trd = (rd + 1) & 0x1f;\n \t\t}\n \t\tbreak;\n \n@@ -2934,7 +2935,8 @@ int emulate_loadstore(struct pt_regs *regs, struct instruction_op *op)\n \t\t\tif (err)\n \t\t\t\tbreak;\n \t\t\tea += 4;\n-\t\t\t++rd;\n+\t\t\t/* reg number wraps from 31 to 0 for stsw[ix] */\n+\t\t\trd = (rd + 1) & 0x1f;\n \t\t}\n \t\tbreak;\n \n",
    "prefixes": [
        "19/17"
    ]
}