From nobody Sun Feb 8 21:05:51 2026 Received: from smtp-out3.simply.com (smtp-out3.simply.com [94.231.106.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6403135B120; Mon, 19 Jan 2026 14:47:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=94.231.106.210 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768834081; cv=none; b=bcEnwrkOhZbDzSxsWUmmoQN4uPBWg4oICgkp0Yx7K+HvivYr1TMh64FYN9bFD3ouwPfV3pnLVr4SSAbdX8o4/wgl1hM6D0Lh95oakBJFsqwEgm7UcULXKiWXgmf5GCzqudS+yZ7WyrE2BANP4g58iojIIR+U0MRN00D6Nkj2n0o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768834081; c=relaxed/simple; bh=PEiPdHozeSM0vv9cYYTi/DgFwXHrPyvO21sCveSHsYc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=VJmxtd6JR0PDnQvIZgErFQw8Y/+UibnpbsT9/qa0YdAdHIy8/1j65Jddu87ZPKtsjarzexyBQTbceA2Z7LkCVbAnfJGttyOzm+R6Zsw2rskRNZcSdJsi6IHazKS8LQnb1m3UtnZGuOjHtzASWEn/OSviDc5k9l5hAi09JqtOIe8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gaisler.com; spf=pass smtp.mailfrom=gaisler.com; dkim=fail (0-bit key) header.d=gaisler.com header.i=@gaisler.com header.b=iy4ouf8A reason="key not found in DNS"; arc=none smtp.client-ip=94.231.106.210 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gaisler.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gaisler.com Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=gaisler.com header.i=@gaisler.com header.b="iy4ouf8A" Received: from localhost (localhost [127.0.0.1]) by smtp.simply.com (Simply.com) with ESMTP id 4dvtbt5zlxz1Fg8j; Mon, 19 Jan 2026 15:47:54 +0100 (CET) Received: from ludwig.got.gaisler.com (h-98-128-223-123.NA.cust.bahnhof.se [98.128.223.123]) by smtp.simply.com (Simply.com) with ESMTPA id 4dvtbt3cJbz1Fg8Z; Mon, 19 Jan 2026 15:47:54 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gaisler.com; s=simplycom2; t=1768834074; bh=3nW+qh8cdtzQfY+zYwYtdBmLgu5nzS6lCQv6gL2GViQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=iy4ouf8ADsQng2Fq5Yfy2PpwHbRYTOV88PWDAEAMacJVhnNZfmMOUFCS2+baIH+2e 6+RySN5mikvlZa0WJ2r3hHESjhgR9P5Z+zMrsWOoAoLt0CDZehGQp7jroVvJf5LAA3 iQekbIWbWC6qJnj8iZFuEn6kvcAJhv/mrYm5bO7+4TxhuHnYHBh22nLYsWpKejVVqC VzcekqlYhDbJYulErzU6SIgAxpWIw7LCJ4dXVt5ZtQiTSlAjOLloUP3HWHh4Nwcivs gFiPZTIEIF8xpFkQ2j3ZjXm9PHi4HHjWnyN0djjRl5qQPYRniPeNSFbb2n24qT/oOr bO7bOZHXXH52Q== From: Ludwig Rydberg To: davem@davemloft.net, andreas@gaisler.com, brauner@kernel.org, shuah@kernel.org Cc: sparclinux@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, arnd@arndb.de, glaubitz@physik.fu-berlin.de, geert@linux-m68k.org, schuster.simon@siemens-energy.com, jrtc27@jrtc27.com, kernel@mkarcher.dialup.fu-berlin.de Subject: [PATCH v2 1/2] sparc: Synchronize user stack on fork and clone Date: Mon, 19 Jan 2026 15:47:52 +0100 Message-Id: <20260119144753.27945-2-ludwig.rydberg@gaisler.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20260119144753.27945-1-ludwig.rydberg@gaisler.com> References: <20260119144753.27945-1-ludwig.rydberg@gaisler.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Andreas Larsson Flush all uncommitted user windows before calling the generic syscall handlers for clone, fork, and vfork. Prior to entering the arch common handlers sparc_{clone|fork|vfork}, the arch-specific syscall wrappers for these syscalls will attempt to flush all windows (including user windows). In the window overflow trap handlers on both SPARC{32|64}, if the window can't be stored (i.e due to MMU related faults) the routine backups the user window and increments a thread counter (wsaved). By adding a synchronization point after the flush attempt, when fault handling is enabled, any uncommitted user windows will be flushed. Link: https://sourceware.org/bugzilla/show_bug.cgi?id=3D31394 Closes: https://lore.kernel.org/sparclinux/fe5cc47167430007560501aabb28ba15= 4985b661.camel@physik.fu-berlin.de/ Signed-off-by: Andreas Larsson Tested-by: John Paul Adrian Glaubitz Signed-off-by: Ludwig Rydberg --- arch/sparc/kernel/process.c | 38 +++++++++++++++++++++++-------------- 1 file changed, 24 insertions(+), 14 deletions(-) diff --git a/arch/sparc/kernel/process.c b/arch/sparc/kernel/process.c index 0442ab00518d..7d69877511fa 100644 --- a/arch/sparc/kernel/process.c +++ b/arch/sparc/kernel/process.c @@ -17,14 +17,18 @@ =20 asmlinkage long sparc_fork(struct pt_regs *regs) { - unsigned long orig_i1 =3D regs->u_regs[UREG_I1]; + unsigned long orig_i1; long ret; struct kernel_clone_args args =3D { .exit_signal =3D SIGCHLD, - /* Reuse the parent's stack for the child. */ - .stack =3D regs->u_regs[UREG_FP], }; =20 + synchronize_user_stack(); + + orig_i1 =3D regs->u_regs[UREG_I1]; + /* Reuse the parent's stack for the child. */ + args.stack =3D regs->u_regs[UREG_FP]; + ret =3D kernel_clone(&args); =20 /* If we get an error and potentially restart the system @@ -40,16 +44,19 @@ asmlinkage long sparc_fork(struct pt_regs *regs) =20 asmlinkage long sparc_vfork(struct pt_regs *regs) { - unsigned long orig_i1 =3D regs->u_regs[UREG_I1]; + unsigned long orig_i1; long ret; - struct kernel_clone_args args =3D { .flags =3D CLONE_VFORK | CLONE_VM, .exit_signal =3D SIGCHLD, - /* Reuse the parent's stack for the child. */ - .stack =3D regs->u_regs[UREG_FP], }; =20 + synchronize_user_stack(); + + orig_i1 =3D regs->u_regs[UREG_I1]; + /* Reuse the parent's stack for the child. */ + args.stack =3D regs->u_regs[UREG_FP]; + ret =3D kernel_clone(&args); =20 /* If we get an error and potentially restart the system @@ -65,15 +72,18 @@ asmlinkage long sparc_vfork(struct pt_regs *regs) =20 asmlinkage long sparc_clone(struct pt_regs *regs) { - unsigned long orig_i1 =3D regs->u_regs[UREG_I1]; - unsigned int flags =3D lower_32_bits(regs->u_regs[UREG_I0]); + unsigned long orig_i1; 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spf=pass smtp.mailfrom=gaisler.com Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=gaisler.com header.i=@gaisler.com header.b="brm6ueQL" Received: from localhost (localhost [127.0.0.1]) by smtp.simply.com (Simply.com) with ESMTP id 4dvtbv2DpKz1Fg8d; Mon, 19 Jan 2026 15:47:55 +0100 (CET) Received: from ludwig.got.gaisler.com (h-98-128-223-123.NA.cust.bahnhof.se [98.128.223.123]) by smtp.simply.com (Simply.com) with ESMTPA id 4dvtbt5qFyz1DDgY; Mon, 19 Jan 2026 15:47:54 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gaisler.com; s=simplycom2; t=1768834075; bh=j4yDMOEg6XIfZw3APHo4V+HY8OEIMSKNw1iXWOzBq3A=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=brm6ueQLAocf6FouHpxZlQgnQDWYvaeouWO9eEQ70JRG77w7l1n4+W62OXQqy84Sf ssOfxuzrMVGPRaH2YWMZ1b159XVDh1VkLMjA5qqLqOEN2kloPxwWo1/O9g5wK4a42t f52YT3qnjdPw/5vZUH4dkHHWYN3s8MXHrlbjRQK6Q1H+aDcV2gRQj5epFVCciVwFEb RB5HbvpHZL8rcW4fLrnHjaXy37Hseqdcc5gqF6Jfn/YH2RowtLUaijvonGyYHJEria XAfEZlodMVwiFSWjR//bQAk0MMM3vS/8uk8J4jUmZAww1lOmbWJg0IYYz3TQTlO1hA 4s8L8Z3NIgm4A== From: Ludwig Rydberg To: davem@davemloft.net, andreas@gaisler.com, brauner@kernel.org, shuah@kernel.org Cc: sparclinux@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, arnd@arndb.de, glaubitz@physik.fu-berlin.de, geert@linux-m68k.org, schuster.simon@siemens-energy.com, jrtc27@jrtc27.com Subject: [PATCH v2 2/2] sparc: Add architecture support for clone3 Date: Mon, 19 Jan 2026 15:47:53 +0100 Message-Id: <20260119144753.27945-3-ludwig.rydberg@gaisler.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20260119144753.27945-1-ludwig.rydberg@gaisler.com> References: <20260119144753.27945-1-ludwig.rydberg@gaisler.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add support for the clone3 system call to the SPARC architectures. The implementation follows the pattern of the original clone syscall. However, instead of explicitly calling kernel_clone, the clone3 handler calls the generic sys_clone3 handler in kernel/fork. In case no stack is provided, the parents stack is reused. The return value convention for clone3 follows the regular kernel return value convention (in contrast to the original clone/fork on SPARC). Closes: https://github.com/sparclinux/issues/issues/10 Signed-off-by: Ludwig Rydberg Acked-by: Arnd Bergmann Reviewed-by: Andreas Larsson Tested-by: Andreas Larsson Tested-by: John Paul Adrian Glaubitz --- arch/sparc/include/asm/syscalls.h | 1 + arch/sparc/include/asm/unistd.h | 2 -- arch/sparc/kernel/entry.S | 15 ++++++++++++++ arch/sparc/kernel/kernel.h | 1 + arch/sparc/kernel/process.c | 14 +++++++++++++ arch/sparc/kernel/process_32.c | 23 ++++++++++++++++------ arch/sparc/kernel/process_64.c | 27 ++++++++++++++++++++------ arch/sparc/kernel/syscalls.S | 8 ++++++++ arch/sparc/kernel/syscalls/syscall.tbl | 2 +- 9 files changed, 78 insertions(+), 15 deletions(-) diff --git a/arch/sparc/include/asm/syscalls.h b/arch/sparc/include/asm/sys= calls.h index 35575fbfb9dc..282e62b66518 100644 --- a/arch/sparc/include/asm/syscalls.h +++ b/arch/sparc/include/asm/syscalls.h @@ -7,5 +7,6 @@ struct pt_regs; asmlinkage long sparc_fork(struct pt_regs *regs); asmlinkage long sparc_vfork(struct pt_regs *regs); asmlinkage long sparc_clone(struct pt_regs *regs); +asmlinkage long sparc_clone3(struct pt_regs *regs); =20 #endif /* _SPARC64_SYSCALLS_H */ diff --git a/arch/sparc/include/asm/unistd.h b/arch/sparc/include/asm/unist= d.h index 3380411a4537..d6bc76706a7a 100644 --- a/arch/sparc/include/asm/unistd.h +++ b/arch/sparc/include/asm/unistd.h @@ -49,8 +49,6 @@ #define __ARCH_WANT_COMPAT_STAT #endif =20 -#define __ARCH_BROKEN_SYS_CLONE3 - #ifdef __32bit_syscall_numbers__ /* Sparc 32-bit only has the "setresuid32", "getresuid32" variants, * it never had the plain ones and there is no value to adding those diff --git a/arch/sparc/kernel/entry.S b/arch/sparc/kernel/entry.S index a3fdee4cd6fa..ea51ef52c952 100644 --- a/arch/sparc/kernel/entry.S +++ b/arch/sparc/kernel/entry.S @@ -907,6 +907,21 @@ flush_patch_four: jmpl %l1 + %lo(sparc_vfork), %g0 add %sp, STACKFRAME_SZ, %o0 =20 + .globl __sys_clone3, flush_patch_five +__sys_clone3: + mov %o7, %l5 +flush_patch_five: + FLUSH_ALL_KERNEL_WINDOWS; + ld [%curptr + TI_TASK], %o4 + rd %psr, %g4 + WRITE_PAUSE + rd %wim, %g5 + WRITE_PAUSE + std %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr] + add %sp, STACKFRAME_SZ, %o0 + call sparc_clone3 + mov %l5, %o7 + .align 4 linux_sparc_ni_syscall: sethi %hi(sys_ni_syscall), %l7 diff --git a/arch/sparc/kernel/kernel.h b/arch/sparc/kernel/kernel.h index 8328a3b78a44..4ee85051521a 100644 --- a/arch/sparc/kernel/kernel.h +++ b/arch/sparc/kernel/kernel.h @@ -18,6 +18,7 @@ extern int ncpus_probed; asmlinkage long sparc_clone(struct pt_regs *regs); asmlinkage long sparc_fork(struct pt_regs *regs); asmlinkage long sparc_vfork(struct pt_regs *regs); +asmlinkage long sparc_clone3(struct pt_regs *regs); =20 #ifdef CONFIG_SPARC64 /* setup_64.c */ diff --git a/arch/sparc/kernel/process.c b/arch/sparc/kernel/process.c index 7d69877511fa..d72fa0665943 100644 --- a/arch/sparc/kernel/process.c +++ b/arch/sparc/kernel/process.c @@ -12,6 +12,7 @@ #include #include #include +#include =20 #include "kernel.h" =20 @@ -118,3 +119,16 @@ asmlinkage long sparc_clone(struct pt_regs *regs) =20 return ret; } + +asmlinkage long sparc_clone3(struct pt_regs *regs) +{ + unsigned long sz; + struct clone_args __user *cl_args; + + synchronize_user_stack(); + + cl_args =3D (struct clone_args __user *)regs->u_regs[UREG_I0]; + sz =3D regs->u_regs[UREG_I1]; + + return sys_clone3(cl_args, sz); +} diff --git a/arch/sparc/kernel/process_32.c b/arch/sparc/kernel/process_32.c index 5a28c0e91bf1..dd8c6c02b0f1 100644 --- a/arch/sparc/kernel/process_32.c +++ b/arch/sparc/kernel/process_32.c @@ -247,6 +247,8 @@ clone_stackframe(struct sparc_stackf __user *dst, * Parent --> %o0 =3D=3D childs pid, %o1 =3D=3D 0 * Child --> %o0 =3D=3D parents pid, %o1 =3D=3D 1 * + * clone3() - Uses regular kernel return value conventions + * * NOTE: We have a separate fork kpsr/kwim because * the parent could change these values between * sys_fork invocation and when we reach here @@ -261,11 +263,11 @@ extern void ret_from_kernel_thread(void); int copy_thread(struct task_struct *p, const struct kernel_clone_args *arg= s) { u64 clone_flags =3D args->flags; - unsigned long sp =3D args->stack; unsigned long tls =3D args->tls; struct thread_info *ti =3D task_thread_info(p); struct pt_regs *childregs, *regs =3D current_pt_regs(); char *new_stack; + unsigned long sp =3D args->stack ? args->stack : regs->u_regs[UREG_FP]; =20 #ifndef CONFIG_SMP if(last_task_used_math =3D=3D current) { @@ -350,13 +352,22 @@ int copy_thread(struct task_struct *p, const struct k= ernel_clone_args *args) childregs->psr &=3D ~PSR_EF; clear_tsk_thread_flag(p, TIF_USEDFPU); #endif + /* Handle return value conventions */ + if (regs->u_regs[UREG_G1] =3D=3D __NR_clone3) { + /* clone3() - use regular kernel return value convention */ + + /* Set the return value for the child. */ + childregs->u_regs[UREG_I0] =3D 0; + } else { + /* clone()/fork() - use SunOS return value convention */ =20 - /* Set the return value for the child. */ - childregs->u_regs[UREG_I0] =3D current->pid; - childregs->u_regs[UREG_I1] =3D 1; + /* Set the return value for the child. */ + childregs->u_regs[UREG_I0] =3D current->pid; + childregs->u_regs[UREG_I1] =3D 1; =20 - /* Set the return value for the parent. */ - regs->u_regs[UREG_I1] =3D 0; + /* Set the return value for the parent. */ + regs->u_regs[UREG_I1] =3D 0; + } =20 if (clone_flags & CLONE_SETTLS) childregs->u_regs[UREG_G7] =3D tls; diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c index 25781923788a..e889da8e4835 100644 --- a/arch/sparc/kernel/process_64.c +++ b/arch/sparc/kernel/process_64.c @@ -564,17 +564,19 @@ void fault_in_user_windows(struct pt_regs *regs) * under SunOS are nothing short of bletcherous: * Parent --> %o0 =3D=3D childs pid, %o1 =3D=3D 0 * Child --> %o0 =3D=3D parents pid, %o1 =3D=3D 1 + * + * clone3() - Uses regular kernel return value conventions */ int copy_thread(struct task_struct *p, const struct kernel_clone_args *arg= s) { u64 clone_flags =3D args->flags; - unsigned long sp =3D args->stack; unsigned long tls =3D args->tls; struct thread_info *t =3D task_thread_info(p); struct pt_regs *regs =3D current_pt_regs(); struct sparc_stackf *parent_sf; unsigned long child_stack_sz; char *child_trap_frame; + unsigned long sp =3D args->stack ? args->stack : regs->u_regs[UREG_FP]; =20 /* Calculate offset to stack_frame & pt_regs */ child_stack_sz =3D (STACKFRAME_SZ + TRACEREG_SZ); @@ -616,12 +618,25 @@ int copy_thread(struct task_struct *p, const struct k= ernel_clone_args *args) if (t->utraps) t->utraps[0]++; =20 - /* Set the return value for the child. */ - t->kregs->u_regs[UREG_I0] =3D current->pid; - t->kregs->u_regs[UREG_I1] =3D 1; + /* Handle return value conventions */ + if (regs->u_regs[UREG_G1] =3D=3D __NR_clone3) { + /* clone3() - use regular kernel return value convention */ + + /* Set the return value for the child. */ + t->kregs->u_regs[UREG_I0] =3D 0; + + /* Clear g1 to indicate user thread */ + t->kregs->u_regs[UREG_G1] =3D 0; + } else { + /* clone()/fork() - use SunOS return value convention */ + + /* Set the return value for the child. */ + t->kregs->u_regs[UREG_I0] =3D current->pid; + t->kregs->u_regs[UREG_I1] =3D 1; =20 - /* Set the second return value for the parent. */ - regs->u_regs[UREG_I1] =3D 0; + /* Set the second return value for the parent. */ + regs->u_regs[UREG_I1] =3D 0; + } =20 if (clone_flags & CLONE_SETTLS) t->kregs->u_regs[UREG_G7] =3D tls; diff --git a/arch/sparc/kernel/syscalls.S b/arch/sparc/kernel/syscalls.S index 0e8ab0602c36..96fe8763d70c 100644 --- a/arch/sparc/kernel/syscalls.S +++ b/arch/sparc/kernel/syscalls.S @@ -103,6 +103,12 @@ sys_clone: ba,pt %xcc, sparc_clone add %sp, PTREGS_OFF, %o0 =20 + .align 32 +__sys_clone3: + flushw + ba,pt %xcc, sparc_clone3 + add %sp, PTREGS_OFF, %o0 + .globl ret_from_fork ret_from_fork: /* Clear current_thread_info()->new_child. */ @@ -113,6 +119,8 @@ ret_from_fork: brnz,pt %o0, ret_sys_call ldx [%g6 + TI_FLAGS], %l0 ldx [%sp + PTREGS_OFF + PT_V9_G1], %l1 + brz,pt %l1, ret_sys_call + nop call %l1 ldx [%sp + PTREGS_OFF + PT_V9_G2], %o0 ba,pt %xcc, ret_sys_call diff --git a/arch/sparc/kernel/syscalls/syscall.tbl b/arch/sparc/kernel/sys= calls/syscall.tbl index 39aa26b6a50b..c0307bb09892 100644 --- a/arch/sparc/kernel/syscalls/syscall.tbl +++ b/arch/sparc/kernel/syscalls/syscall.tbl @@ -480,7 +480,7 @@ 432 common fsmount sys_fsmount 433 common fspick sys_fspick 434 common pidfd_open sys_pidfd_open -# 435 reserved for clone3 +435 common clone3 __sys_clone3 436 common close_range sys_close_range 437 common openat2 sys_openat2 438 common pidfd_getfd sys_pidfd_getfd --=20 2.35.3