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GET /api/1.1/patches/2221066/?format=api
{ "id": 2221066, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2221066/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260408184228.44242-1-james.hilliard1@gmail.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.1/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20260408184228.44242-1-james.hilliard1@gmail.com>", "date": "2026-04-08T18:42:28", "name": "linux-user/mips: keep k0 in sync with CP0_UserLocal", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "c3fe2a80145f3cf81ffa98f207c6bae484d97ee4", "submitter": { "id": 66301, "url": "http://patchwork.ozlabs.org/api/1.1/people/66301/?format=api", "name": "James Hilliard", "email": "james.hilliard1@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260408184228.44242-1-james.hilliard1@gmail.com/mbox/", "series": [ { "id": 499187, "url": "http://patchwork.ozlabs.org/api/1.1/series/499187/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=499187", "date": "2026-04-08T18:42:28", "name": "linux-user/mips: keep k0 in sync with CP0_UserLocal", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/499187/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2221066/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2221066/checks/", "tags": {}, "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=aoUsOhd4;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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helo=mail-oa1-x2c.google.com", "X-Spam_score_int": "-17", "X-Spam_score": "-1.8", "X-Spam_bar": "-", "X-Spam_report": "(-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "MIPS glibc startup expects the thread pointer to be live in both\nCP0_UserLocal and k0. linux-user already updates CP0_UserLocal for\ncpu_set_tls() and TARGET_NR_set_thread_area, but it leaves gpr[26]\nunchanged.\n\nA guest can therefore successfully execute set_thread_area() and still\nreach __pthread_initialize_minimal() with k0 == 0, faulting on the\nfirst TLS-relative store.\n\nMake cpu_set_tls() synchronize k0 with CP0_UserLocal, and route the\nMIPS set_thread_area syscall through cpu_set_tls() so all guest TLS\nupdates follow the same path.\n\nSigned-off-by: James Hilliard <james.hilliard1@gmail.com>\n---\n linux-user/mips/target_cpu.h | 1 +\n linux-user/syscall.c | 2 +-\n 2 files changed, 2 insertions(+), 1 deletion(-)", "diff": "diff --git a/linux-user/mips/target_cpu.h b/linux-user/mips/target_cpu.h\nindex c375616c55..0a000ac8f3 100644\n--- a/linux-user/mips/target_cpu.h\n+++ b/linux-user/mips/target_cpu.h\n@@ -36,6 +36,7 @@ static inline void cpu_clone_regs_parent(CPUMIPSState *env, unsigned flags)\n static inline void cpu_set_tls(CPUMIPSState *env, target_ulong newtls)\n {\n env->active_tc.CP0_UserLocal = newtls;\n+ env->active_tc.gpr[26] = newtls;\n }\n \n static inline abi_ulong get_sp_from_cpustate(CPUMIPSState *state)\ndiff --git a/linux-user/syscall.c b/linux-user/syscall.c\nindex f4b74ad350..8e96cc26db 100644\n--- a/linux-user/syscall.c\n+++ b/linux-user/syscall.c\n@@ -13216,7 +13216,7 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,\n #ifdef TARGET_NR_set_thread_area\n case TARGET_NR_set_thread_area:\n #if defined(TARGET_MIPS)\n- cpu_env->active_tc.CP0_UserLocal = arg1;\n+ cpu_set_tls(cpu_env, arg1);\n return 0;\n #elif defined(TARGET_I386) && defined(TARGET_ABI32)\n return do_set_thread_area(cpu_env, arg1);\n", "prefixes": [] }