From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3CF3DC433F5 for ; Wed, 8 Sep 2021 07:16:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1140C61139 for ; Wed, 8 Sep 2021 07:16:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348992AbhIHHRQ (ORCPT ); Wed, 8 Sep 2021 03:17:16 -0400 Received: from mail.kernel.org ([198.145.29.99]:56626 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348183AbhIHHRM (ORCPT ); Wed, 8 Sep 2021 03:17:12 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3FF9E61175; Wed, 8 Sep 2021 07:16:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1631085365; bh=1/IFokHOQ1uuA15hbhe9wXzJbAJFvWB7ePHuPLxg7v8=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=B0a7CUuGfDv2m9rXB24G5dzTbduwNsd+3QyoiIOuarViTacZYcTysWqrf0huM5qv5 OL+ywiXiuQR/NS0/jYIWwfu2U5Awgomw334vkaouvqnjEzrjQ3ZoPHb248SIPUCf25 2CoHeEHdrb2yIgeqhD0l4BfpsjYrUl+XXSsP3FJoeJfaknP1aI1W70zFQWBij1mEZ6 2qyTqxtUuKuaoAlB/4GuRfDp7vpZFYI84Tr/EZDTLfH2GfcNMnis6mRiCIUtCuhavZ 3v0geFfir+vVcSg0bUY36uTc9TjVLAcWs6GKUcseqlG4DUVXRLM+bmjzcmMDt/7IKC k5JRxSkiueNrA== Received: by mail-vk1-f172.google.com with SMTP id h13so420072vkc.12; Wed, 08 Sep 2021 00:16:05 -0700 (PDT) X-Gm-Message-State: AOAM5328Q1Z8PpEufs0xJQfefQu5b5AzOpqW0zzS7isCW8uxuGZEl8WS 1J2HyR+f1eyJD8uvgBEArmLj+n83pNJ7HYRvMgI= X-Google-Smtp-Source: ABdhPJw7eTkygZB0bXanELCk14o9H10//FESokujLPCyQpAw+a1XVIMJKP9Q7qapxCYW9nDKjEiAae++3o6QdWAjmTk= X-Received: by 2002:a1f:72cb:: with SMTP id n194mr1101568vkc.11.1631085363632; Wed, 08 Sep 2021 00:16:03 -0700 (PDT) MIME-Version: 1.0 References: <59feb382-a4ab-c94e-8f71-10ad0c0ceceb@flygoat.com> In-Reply-To: From: Huacai Chen Date: Wed, 8 Sep 2021 15:15:50 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 1/2] mips: convert syscall to generic entry To: =?UTF-8?B?6ZmI6aOe5oms?= Cc: Jiaxun Yang , Thomas Bogendoerfer , Thomas Gleixner , Peter Zijlstra , Andy Lutomirski , Arnd Bergmann , Feiyang Chen , "open list:MIPS" , linux-arch , Yanteng Si Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Reviewed-by: Huacai Chen On Wed, Sep 8, 2021 at 10:08 AM =E9=99=88=E9=A3=9E=E6=89=AC wrote: > > On Tue, 7 Sept 2021 at 21:49, Jiaxun Yang wrote= : > > > > > > =E5=9C=A8 2021/9/7 14:16, FreeFlyingSheep =E5=86=99=E9=81=93: > > > From: Feiyang Chen > > > > > > Convert mips syscall to use the generic entry infrastructure from > > > kernel/entry/*. > > > > > > There are a few special things on mips: > > > > > > - There is one type of syscall on mips32 (scall32-o32) and three type= s > > > of syscalls on mips64 (scall64-o32, scall64-n32 and scall64-n64). Now > > > convert to C code to handle different types of syscalls. > > > > > > - For some special syscalls (e.g. fork, clone, clone3 and sysmips), > > > save_static_function() wrapper is used to save static registers. Now > > > SAVE_STATIC is used in handle_sys before calling do_syscall(), so the > > > save_static_function() wrapper can be removed. > > > > > > - For sigreturn/rt_sigreturn and sysmips, inline assembly is used to > > > jump to syscall_exit directly for skipping setting the error flag and > > > restoring all registers. Now use regs->regs[27] to mark whether to > > > handle the error flag and always restore all registers in handle_sys, > > > so these functions can return normally as other architecture. > > > > Hmm, that would give us overhead of register context on these syscalls. > > > > I guess it's worthy? > > > > Hi, Jiaxun, > > Saving and restoring registers against different system calls can be > difficult due to the use of generic entry. > To avoid a lot of duplicate code, I think the overhead is worth it. > > > > > > > Signed-off-by: Feiyang Chen > > > Signed-off-by: Yanteng Si > > > > For the code, > > > > Reviewed-by: Jiaxun Yang > > > > After spending 3hrs diving into syscall handling hell, I must say you'v= e > > done a good job. I'll start a LTP run to see if we miss any corner > > cases. And left IRQ part for another trial. > > > > Thank you for your review. I've already run tests in Unixbench. > It's more reassuring to run tests in LTP, so I'll do that too. > > Thanks, > Feiyang > > > Thanks. > > > > Jiaxun > > > > > --- > > > arch/mips/Kconfig | 1 + > > > arch/mips/include/asm/entry-common.h | 13 ++ > > > arch/mips/include/asm/ptrace.h | 8 +- > > > arch/mips/include/asm/sim.h | 70 ------- > > > arch/mips/include/asm/syscall.h | 5 + > > > arch/mips/include/asm/thread_info.h | 17 +- > > > arch/mips/include/uapi/asm/ptrace.h | 7 +- > > > arch/mips/kernel/Makefile | 14 +- > > > arch/mips/kernel/entry.S | 75 ++------ > > > arch/mips/kernel/linux32.c | 1 - > > > arch/mips/kernel/ptrace.c | 78 -------- > > > arch/mips/kernel/scall.S | 135 +++++++++++++ > > > arch/mips/kernel/scall32-o32.S | 223 -------------------= --- > > > arch/mips/kernel/scall64-n32.S | 107 ----------- > > > arch/mips/kernel/scall64-n64.S | 116 ----------- > > > arch/mips/kernel/scall64-o32.S | 221 -------------------= -- > > > arch/mips/kernel/signal.c | 35 ++-- > > > arch/mips/kernel/signal_n32.c | 15 +- > > > arch/mips/kernel/signal_o32.c | 29 +-- > > > arch/mips/kernel/syscall.c | 147 +++++++++++--- > > > arch/mips/kernel/syscalls/syscall_n32.tbl | 8 +- > > > arch/mips/kernel/syscalls/syscall_n64.tbl | 8 +- > > > arch/mips/kernel/syscalls/syscall_o32.tbl | 8 +- > > > 23 files changed, 346 insertions(+), 995 deletions(-) > > > create mode 100644 arch/mips/include/asm/entry-common.h > > > delete mode 100644 arch/mips/include/asm/sim.h > > > create mode 100644 arch/mips/kernel/scall.S > > > delete mode 100644 arch/mips/kernel/scall32-o32.S > > > delete mode 100644 arch/mips/kernel/scall64-n32.S > > > delete mode 100644 arch/mips/kernel/scall64-n64.S > > > delete mode 100644 arch/mips/kernel/scall64-o32.S > > > > > > diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig > > > index 0cf31a6cbee1..61aa125aa2da 100644 > > > --- a/arch/mips/Kconfig > > > +++ b/arch/mips/Kconfig > > > @@ -32,6 +32,7 @@ config MIPS > > > select GENERIC_ATOMIC64 if !64BIT > > > select GENERIC_CMOS_UPDATE > > > select GENERIC_CPU_AUTOPROBE > > > + select GENERIC_ENTRY > > > select GENERIC_GETTIMEOFDAY > > > select GENERIC_IOMAP > > > select GENERIC_IRQ_PROBE > > > diff --git a/arch/mips/include/asm/entry-common.h b/arch/mips/include= /asm/entry-common.h > > > new file mode 100644 > > > index 000000000000..0fe2a098ded9 > > > --- /dev/null > > > +++ b/arch/mips/include/asm/entry-common.h > > > @@ -0,0 +1,13 @@ > > > +/* SPDX-License-Identifier: GPL-2.0 */ > > > +#ifndef ARCH_LOONGARCH_ENTRY_COMMON_H > > > +#define ARCH_LOONGARCH_ENTRY_COMMON_H > > > + > > > +#include > > > +#include > > > + > > > +static inline bool on_thread_stack(void) > > > +{ > > > + return !(((unsigned long)(current->stack) ^ current_stack_point= er) & ~(THREAD_SIZE - 1)); > > > +} > > > + > > > +#endif > > > diff --git a/arch/mips/include/asm/ptrace.h b/arch/mips/include/asm/p= trace.h > > > index daf3cf244ea9..1b8f9d2ddc44 100644 > > > --- a/arch/mips/include/asm/ptrace.h > > > +++ b/arch/mips/include/asm/ptrace.h > > > @@ -51,6 +51,11 @@ struct pt_regs { > > > unsigned long __last[0]; > > > } __aligned(8); > > > > > > +static inline int regs_irqs_disabled(struct pt_regs *regs) > > > +{ > > > + return arch_irqs_disabled_flags(regs->cp0_status); > > > +} > > > + > > > static inline unsigned long kernel_stack_pointer(struct pt_regs *re= gs) > > > { > > > return regs->regs[29]; > > > @@ -156,9 +161,6 @@ static inline long regs_return_value(struct pt_re= gs *regs) > > > #define instruction_pointer(regs) ((regs)->cp0_epc) > > > #define profile_pc(regs) instruction_pointer(regs) > > > > > > -extern asmlinkage long syscall_trace_enter(struct pt_regs *regs, lon= g syscall); > > > -extern asmlinkage void syscall_trace_leave(struct pt_regs *regs); > > > - > > > extern void die(const char *, struct pt_regs *) __noreturn; > > > > > > static inline void die_if_kernel(const char *str, struct pt_regs *r= egs) > > > diff --git a/arch/mips/include/asm/sim.h b/arch/mips/include/asm/sim.= h > > > deleted file mode 100644 > > > index 59f31a95facd..000000000000 > > > --- a/arch/mips/include/asm/sim.h > > > +++ /dev/null > > > @@ -1,70 +0,0 @@ > > > -/* > > > - * This file is subject to the terms and conditions of the GNU Gener= al Public > > > - * License. See the file "COPYING" in the main directory of this ar= chive > > > - * for more details. > > > - * > > > - * Copyright (C) 1999, 2000, 2003 Ralf Baechle > > > - * Copyright (C) 1999, 2000 Silicon Graphics, Inc. > > > - */ > > > -#ifndef _ASM_SIM_H > > > -#define _ASM_SIM_H > > > - > > > - > > > -#include > > > - > > > -#define __str2(x) #x > > > -#define __str(x) __str2(x) > > > - > > > -#ifdef CONFIG_32BIT > > > - > > > -#define save_static_function(symbol) = \ > > > -__asm__( = \ > > > - ".text\n\t" = \ > > > - ".globl\t__" #symbol "\n\t" = \ > > > - ".align\t2\n\t" = \ > > > - ".type\t__" #symbol ", @function\n\t" = \ > > > - ".ent\t__" #symbol ", 0\n__" = \ > > > - #symbol":\n\t" = \ > > > - ".frame\t$29, 0, $31\n\t" = \ > > > - "sw\t$16,"__str(PT_R16)"($29)\t\t\t# save_static_function\n\t" = \ > > > - "sw\t$17,"__str(PT_R17)"($29)\n\t" = \ > > > - "sw\t$18,"__str(PT_R18)"($29)\n\t" = \ > > > - "sw\t$19,"__str(PT_R19)"($29)\n\t" = \ > > > - "sw\t$20,"__str(PT_R20)"($29)\n\t" = \ > > > - "sw\t$21,"__str(PT_R21)"($29)\n\t" = \ > > > - "sw\t$22,"__str(PT_R22)"($29)\n\t" = \ > > > - "sw\t$23,"__str(PT_R23)"($29)\n\t" = \ > > > - "sw\t$30,"__str(PT_R30)"($29)\n\t" = \ > > > - "j\t" #symbol "\n\t" = \ > > > - ".end\t__" #symbol "\n\t" = \ > > > - ".size\t__" #symbol",. - __" #symbol) > > > - > > > -#endif /* CONFIG_32BIT */ > > > - > > > -#ifdef CONFIG_64BIT > > > - > > > -#define save_static_function(symbol) = \ > > > -__asm__( = \ > > > - ".text\n\t" = \ > > > - ".globl\t__" #symbol "\n\t" = \ > > > - ".align\t2\n\t" = \ > > > - ".type\t__" #symbol ", @function\n\t" = \ > > > - ".ent\t__" #symbol ", 0\n__" = \ > > > - #symbol":\n\t" = \ > > > - ".frame\t$29, 0, $31\n\t" = \ > > > - "sd\t$16,"__str(PT_R16)"($29)\t\t\t# save_static_function\n\t" = \ > > > - "sd\t$17,"__str(PT_R17)"($29)\n\t" = \ > > > - "sd\t$18,"__str(PT_R18)"($29)\n\t" = \ > > > - "sd\t$19,"__str(PT_R19)"($29)\n\t" = \ > > > - "sd\t$20,"__str(PT_R20)"($29)\n\t" = \ > > > - "sd\t$21,"__str(PT_R21)"($29)\n\t" = \ > > > - "sd\t$22,"__str(PT_R22)"($29)\n\t" = \ > > > - "sd\t$23,"__str(PT_R23)"($29)\n\t" = \ > > > - "sd\t$30,"__str(PT_R30)"($29)\n\t" = \ > > > - "j\t" #symbol "\n\t" = \ > > > - ".end\t__" #symbol "\n\t" = \ > > > - ".size\t__" #symbol",. - __" #symbol) > > > - > > > -#endif /* CONFIG_64BIT */ > > > - > > > -#endif /* _ASM_SIM_H */ > > > diff --git a/arch/mips/include/asm/syscall.h b/arch/mips/include/asm/= syscall.h > > > index 25fa651c937d..02ca0d659428 100644 > > > --- a/arch/mips/include/asm/syscall.h > > > +++ b/arch/mips/include/asm/syscall.h > > > @@ -157,4 +157,9 @@ static inline int syscall_get_arch(struct task_st= ruct *task) > > > return arch; > > > } > > > > > > +static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *re= gs) > > > +{ > > > + return false; > > > +} > > > + > > > #endif /* __ASM_MIPS_SYSCALL_H */ > > > diff --git a/arch/mips/include/asm/thread_info.h b/arch/mips/include/= asm/thread_info.h > > > index 0b17aaa9e012..5a5237413065 100644 > > > --- a/arch/mips/include/asm/thread_info.h > > > +++ b/arch/mips/include/asm/thread_info.h > > > @@ -29,7 +29,8 @@ struct thread_info { > > > __u32 cpu; /* current CPU */ > > > int preempt_count; /* 0 =3D> preemptable, = <0 =3D> BUG */ > > > struct pt_regs *regs; > > > - long syscall; /* syscall number */ > > > + unsigned long syscall; /* syscall number */ > > > + unsigned long syscall_work; /* SYSCALL_WORK_ flags = */ > > > }; > > > > > > /* > > > @@ -69,6 +70,8 @@ static inline struct thread_info *current_thread_in= fo(void) > > > return __current_thread_info; > > > } > > > > > > +register unsigned long current_stack_pointer __asm__("$29"); > > > + > > > #endif /* !__ASSEMBLY__ */ > > > > > > /* thread information allocation */ > > > @@ -149,22 +152,10 @@ static inline struct thread_info *current_threa= d_info(void) > > > #define _TIF_MSA_CTX_LIVE (1< > > #define _TIF_SYSCALL_TRACEPOINT (1< > > > > > -#define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE= | \ > > > - _TIF_SYSCALL_AUDIT | \ > > > - _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP= ) > > > - > > > -/* work to do in syscall_trace_leave() */ > > > -#define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE= | \ > > > - _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRAC= EPOINT) > > > - > > > /* work to do on interrupt/exception return */ > > > #define _TIF_WORK_MASK \ > > > (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME | = \ > > > _TIF_UPROBE | _TIF_NOTIFY_SIGNAL) > > > -/* work to do on any return to u-space */ > > > -#define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | = \ > > > - _TIF_WORK_SYSCALL_EXIT | = \ > > > - _TIF_SYSCALL_TRACEPOINT) > > > > > > /* > > > * We stash processor id into a COP0 register to retrieve it fast > > > diff --git a/arch/mips/include/uapi/asm/ptrace.h b/arch/mips/include/= uapi/asm/ptrace.h > > > index f3c025445e45..27e2c85398bc 100644 > > > --- a/arch/mips/include/uapi/asm/ptrace.h > > > +++ b/arch/mips/include/uapi/asm/ptrace.h > > > @@ -102,8 +102,9 @@ struct pt_watch_regs { > > > }; > > > }; > > > > > > -#define PTRACE_GET_WATCH_REGS 0xd0 > > > -#define PTRACE_SET_WATCH_REGS 0xd1 > > > - > > > +#define PTRACE_SYSEMU 0x1f > > > +#define PTRACE_SYSEMU_SINGLESTEP 0x20 > > > +#define PTRACE_GET_WATCH_REGS 0xd0 > > > +#define PTRACE_SET_WATCH_REGS 0xd1 > > > > > > #endif /* _UAPI_ASM_PTRACE_H */ > > > diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile > > > index 814b3da30501..44875660f6ae 100644 > > > --- a/arch/mips/kernel/Makefile > > > +++ b/arch/mips/kernel/Makefile > > > @@ -5,10 +5,10 @@ > > > > > > extra-y :=3D head.o vmlinux.lds > > > > > > -obj-y +=3D branch.o cmpxchg.o elf.o entry.o genex.o i= dle.o irq.o \ > > > - process.o prom.o ptrace.o reset.o setup.o signal.o \ > > > - syscall.o time.o topology.o traps.o unaligned.o watc= h.o \ > > > - vdso.o cacheinfo.o > > > +obj-y +=3D branch.o cacheinfo.o cmpxchg.o elf.o entry= .o genex.o \ > > > + idle.o irq.o process.o prom.o ptrace.o reset.o scall= .o \ > > > + setup.o signal.o syscall.o time.o topology.o traps.o= \ > > > + unaligned.o watch.o vdso.o > > > > > > ifdef CONFIG_CPU_R3K_TLB > > > obj-y +=3D cpu-r3k-probe.o > > > @@ -76,11 +76,9 @@ obj-$(CONFIG_IRQ_TXX9) +=3D irq_txx9.o > > > obj-$(CONFIG_IRQ_GT641XX) +=3D irq-gt641xx.o > > > > > > obj-$(CONFIG_KPROBES) +=3D kprobes.o > > > -obj-$(CONFIG_32BIT) +=3D scall32-o32.o > > > -obj-$(CONFIG_64BIT) +=3D scall64-n64.o > > > obj-$(CONFIG_MIPS32_COMPAT) +=3D linux32.o ptrace32.o signal32.o > > > -obj-$(CONFIG_MIPS32_N32) +=3D scall64-n32.o signal_n32.o > > > -obj-$(CONFIG_MIPS32_O32) +=3D scall64-o32.o signal_o32.o > > > +obj-$(CONFIG_MIPS32_N32) +=3D signal_n32.o > > > +obj-$(CONFIG_MIPS32_O32) +=3D signal_o32.o > > > > > > obj-$(CONFIG_KGDB) +=3D kgdb.o > > > obj-$(CONFIG_PROC_FS) +=3D proc.o > > > diff --git a/arch/mips/kernel/entry.S b/arch/mips/kernel/entry.S > > > index 4b896f5023ff..1a2aec9dab1b 100644 > > > --- a/arch/mips/kernel/entry.S > > > +++ b/arch/mips/kernel/entry.S > > > @@ -72,49 +72,32 @@ FEXPORT(ret_from_kernel_thread) > > > jal schedule_tail # a0 =3D struct task_struct *pr= ev > > > move a0, s1 > > > jal s0 > > > - j syscall_exit > > > + move a0, sp > > > + jal syscall_exit_to_user_mode > > > + > > > + .set noat > > > + RESTORE_STATIC > > > + RESTORE_SOME > > > + RESTORE_SP_AND_RET > > > + .set at > > > > > > FEXPORT(ret_from_fork) > > > jal schedule_tail # a0 =3D struct task_struct *pr= ev > > > - > > > -FEXPORT(syscall_exit) > > > -#ifdef CONFIG_DEBUG_RSEQ > > > move a0, sp > > > - jal rseq_syscall > > > -#endif > > > - local_irq_disable # make sure need_resched and > > > - # signals dont change between > > > - # sampling and return > > > - LONG_L a2, TI_FLAGS($28) # current->work > > > - li t0, _TIF_ALLWORK_MASK > > > - and t0, a2, t0 > > > - bnez t0, syscall_exit_work > > > + jal syscall_exit_to_user_mode > > > > > > -restore_all: # restore full frame > > > .set noat > > > - RESTORE_TEMP > > > - RESTORE_AT > > > RESTORE_STATIC > > > -restore_partial: # restore partial frame > > > -#ifdef CONFIG_TRACE_IRQFLAGS > > > - SAVE_STATIC > > > - SAVE_AT > > > - SAVE_TEMP > > > - LONG_L v0, PT_STATUS(sp) > > > -#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) > > > - and v0, ST0_IEP > > > -#else > > > - and v0, ST0_IE > > > -#endif > > > - beqz v0, 1f > > > - jal trace_hardirqs_on > > > - b 2f > > > -1: jal trace_hardirqs_off > > > -2: > > > + RESTORE_SOME > > > + RESTORE_SP_AND_RET > > > + .set at > > > + > > > +restore_all: # restore full frame > > > + .set noat > > > RESTORE_TEMP > > > RESTORE_AT > > > RESTORE_STATIC > > > -#endif > > > +restore_partial: # restore partial frame > > > RESTORE_SOME > > > RESTORE_SP_AND_RET > > > .set at > > > @@ -143,32 +126,6 @@ work_notifysig: # deal = with pending signals and > > > jal do_notify_resume # a2 already loaded > > > j resume_userspace_check > > > > > > -FEXPORT(syscall_exit_partial) > > > -#ifdef CONFIG_DEBUG_RSEQ > > > - move a0, sp > > > - jal rseq_syscall > > > -#endif > > > - local_irq_disable # make sure need_resched doesn'= t > > > - # change between and return > > > - LONG_L a2, TI_FLAGS($28) # current->work > > > - li t0, _TIF_ALLWORK_MASK > > > - and t0, a2 > > > - beqz t0, restore_partial > > > - SAVE_STATIC > > > -syscall_exit_work: > > > - LONG_L t0, PT_STATUS(sp) # returning to kernel m= ode? > > > - andi t0, t0, KU_USER > > > - beqz t0, resume_kernel > > > - li t0, _TIF_WORK_SYSCALL_EXIT > > > - and t0, a2 # a2 is preloaded with TI_FLAGS > > > - beqz t0, work_pending # trace bit set? > > > - local_irq_enable # could let syscall_trace_leave= () > > > - # call schedule() instead > > > - TRACE_IRQS_ON > > > - move a0, sp > > > - jal syscall_trace_leave > > > - b resume_userspace > > > - > > > #if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR5) || \ > > > defined(CONFIG_CPU_MIPSR6) || defined(CONFIG_MIPS_MT) > > > > > > diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c > > > index 6b61be486303..2b4b1fc1ff1b 100644 > > > --- a/arch/mips/kernel/linux32.c > > > +++ b/arch/mips/kernel/linux32.c > > > @@ -38,7 +38,6 @@ > > > #include > > > > > > #include > > > -#include > > > #include > > > #include > > > #include > > > diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c > > > index db7c5be1d4a3..04c08e41cfd3 100644 > > > --- a/arch/mips/kernel/ptrace.c > > > +++ b/arch/mips/kernel/ptrace.c > > > @@ -46,9 +46,6 @@ > > > #include > > > #include > > > > > > -#define CREATE_TRACE_POINTS > > > -#include > > > - > > > /* > > > * Called by kernel/ptrace.c when detaching.. > > > * > > > @@ -1305,78 +1302,3 @@ long arch_ptrace(struct task_struct *child, lo= ng request, > > > out: > > > return ret; > > > } > > > - > > > -/* > > > - * Notification of system call entry/exit > > > - * - triggered by current->work.syscall_trace > > > - */ > > > -asmlinkage long syscall_trace_enter(struct pt_regs *regs, long sysca= ll) > > > -{ > > > - user_exit(); > > > - > > > - current_thread_info()->syscall =3D syscall; > > > - > > > - if (test_thread_flag(TIF_SYSCALL_TRACE)) { > > > - if (tracehook_report_syscall_entry(regs)) > > > - return -1; > > > - syscall =3D current_thread_info()->syscall; > > > - } > > > - > > > -#ifdef CONFIG_SECCOMP > > > - if (unlikely(test_thread_flag(TIF_SECCOMP))) { > > > - int ret, i; > > > - struct seccomp_data sd; > > > - unsigned long args[6]; > > > - > > > - sd.nr =3D syscall; > > > - sd.arch =3D syscall_get_arch(current); > > > - syscall_get_arguments(current, regs, args); > > > - for (i =3D 0; i < 6; i++) > > > - sd.args[i] =3D args[i]; > > > - sd.instruction_pointer =3D KSTK_EIP(current); > > > - > > > - ret =3D __secure_computing(&sd); > > > - if (ret =3D=3D -1) > > > - return ret; > > > - syscall =3D current_thread_info()->syscall; > > > - } > > > -#endif > > > - > > > - if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) > > > - trace_sys_enter(regs, regs->regs[2]); > > > - > > > - audit_syscall_entry(syscall, regs->regs[4], regs->regs[5], > > > - regs->regs[6], regs->regs[7]); > > > - > > > - /* > > > - * Negative syscall numbers are mistaken for rejected syscalls,= but > > > - * won't have had the return value set appropriately, so we do = so now. > > > - */ > > > - if (syscall < 0) > > > - syscall_set_return_value(current, regs, -ENOSYS, 0); > > > - return syscall; > > > -} > > > - > > > -/* > > > - * Notification of system call entry/exit > > > - * - triggered by current->work.syscall_trace > > > - */ > > > -asmlinkage void syscall_trace_leave(struct pt_regs *regs) > > > -{ > > > - /* > > > - * We may come here right after calling schedule_user() > > > - * or do_notify_resume(), in which case we can be in RCU > > > - * user mode. > > > - */ > > > - user_exit(); > > > - > > > - audit_syscall_exit(regs); > > > - > > > - if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) > > > - trace_sys_exit(regs, regs_return_value(regs)); > > > - > > > - if (test_thread_flag(TIF_SYSCALL_TRACE)) > > > - tracehook_report_syscall_exit(regs, 0); > > > - > > > - user_enter(); > > > -} > > > diff --git a/arch/mips/kernel/scall.S b/arch/mips/kernel/scall.S > > > new file mode 100644 > > > index 000000000000..7b35969151de > > > --- /dev/null > > > +++ b/arch/mips/kernel/scall.S > > > @@ -0,0 +1,135 @@ > > > +/* SPDX-License-Identifier: GPL-2.0 */ > > > +/* > > > + * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01, 02 by Ralf Baechle > > > + * Copyright (C) 1999, 2000 Silicon Graphics, Inc. > > > + * Copyright (C) 2001 MIPS Technologies, Inc. > > > + * Copyright (C) 2004 Thiemo Seufer > > > + * Copyright (C) 2014 Imagination Technologies Ltd. > > > + */ > > > +#include > > > +#include > > > +#include > > > +#include > > > +#include > > > +#include > > > +#include > > > +#include > > > +#include > > > +#include > > > +#include > > > +#include > > > + > > > + .align 5 > > > +NESTED(handle_sys, PT_SIZE, sp) > > > + .set noat > > > + SAVE_SOME > > > + SAVE_STATIC > > > + CLI > > > + .set at > > > + > > > + move a0, sp > > > + jal do_syscall > > > + > > > + .set noat > > > + RESTORE_TEMP > > > + RESTORE_AT > > > + RESTORE_STATIC > > > + RESTORE_SOME > > > + RESTORE_SP_AND_RET > > > + .set at > > > + END(handle_sys) > > > + > > > +#ifdef CONFIG_32BIT > > > +LEAF(sys_syscall) > > > + subu t0, a0, __NR_O32_Linux # check syscall number > > > + sltiu v0, t0, __NR_O32_Linux_syscalls > > > + beqz t0, einval # do not recurse > > > + sll t1, t0, 2 > > > + beqz v0, einval > > > + lw t2, sys_call_table(t1) # syscall routine > > > + > > > + move a0, a1 # shift argument regist= ers > > > + move a1, a2 > > > + move a2, a3 > > > + lw a3, 16(sp) > > > + lw t4, 20(sp) > > > + lw t5, 24(sp) > > > + lw t6, 28(sp) > > > + sw t4, 16(sp) > > > + sw t5, 20(sp) > > > + sw t6, 24(sp) > > > + jr t2 > > > + /* Unreached */ > > > + > > > +einval: li v0, -ENOSYS > > > + jr ra > > > + END(sys_syscall) > > > + > > > +#ifdef CONFIG_MIPS_MT_FPAFF > > > + /* > > > + * For FPU affinity scheduling on MIPS MT processors, we need t= o > > > + * intercept sys_sched_xxxaffinity() calls until we get a prope= r hook > > > + * in kernel/sched/core.c. Considered only temporary we only s= upport > > > + * these hooks for the 32-bit kernel - there is no MIPS64 MT pr= ocessor > > > + * atm. > > > + */ > > > +#define sys_sched_setaffinity mipsmt_sys_sched_setaffinity > > > +#define sys_sched_getaffinity mipsmt_sys_sched_getaffinity > > > +#endif /* CONFIG_MIPS_MT_FPAFF */ > > > + > > > +#define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, n= ative) > > > +#define __SYSCALL(nr, entry) PTR entry > > > + .align 2 > > > + .type sys_call_table, @object > > > +EXPORT(sys_call_table) > > > +#include > > > +#endif /* CONFIG_32BIT */ > > > + > > > +#ifdef CONFIG_64BIT > > > +#ifdef CONFIG_MIPS32_O32 > > > +LEAF(sys32_syscall) > > > + subu t0, a0, __NR_O32_Linux # check syscall number > > > + sltiu v0, t0, __NR_O32_Linux_syscalls > > > + beqz t0, einval # do not recurse > > > + dsll t1, t0, 3 > > > + beqz v0, einval > > > + ld t2, sys32_call_table(t1) # syscall routine > > > + > > > + move a0, a1 # shift argument regist= ers > > > + move a1, a2 > > > + move a2, a3 > > > + move a3, a4 > > > + move a4, a5 > > > + move a5, a6 > > > + move a6, a7 > > > + jr t2 > > > + /* Unreached */ > > > + > > > +einval: li v0, -ENOSYS > > > + jr ra > > > + END(sys32_syscall) > > > + > > > +#define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, c= ompat) > > > +#define __SYSCALL(nr, entry) PTR entry > > > + .align 3 > > > + .type sys32_call_table,@object > > > +EXPORT(sys32_call_table) > > > +#include > > > +#endif /* CONFIG_MIPS32_O32 */ > > > + > > > +#ifdef CONFIG_MIPS32_N32 > > > +#undef __SYSCALL > > > +#define __SYSCALL(nr, entry) PTR entry > > > + .align 3 > > > + .type sysn32_call_table, @object > > > +EXPORT(sysn32_call_table) > > > +#include > > > +#endif /* CONFIG_MIPS32_N32 */ > > > + > > > +#undef __SYSCALL > > > +#define __SYSCALL(nr, entry) PTR entry > > > + .align 3 > > > + .type sys_call_table, @object > > > +EXPORT(sys_call_table) > > > +#include > > > +#endif /* CONFIG_64BIT */ > > > diff --git a/arch/mips/kernel/scall32-o32.S b/arch/mips/kernel/scall3= 2-o32.S > > > deleted file mode 100644 > > > index b1b2e106f711..000000000000 > > > --- a/arch/mips/kernel/scall32-o32.S > > > +++ /dev/null > > > @@ -1,223 +0,0 @@ > > > -/* > > > - * This file is subject to the terms and conditions of the GNU Gener= al Public > > > - * License. See the file "COPYING" in the main directory of this ar= chive > > > - * for more details. > > > - * > > > - * Copyright (C) 1995-99, 2000- 02, 06 Ralf Baechle > > > - * Copyright (C) 2001 MIPS Technologies, Inc. > > > - * Copyright (C) 2004 Thiemo Seufer > > > - * Copyright (C) 2014 Imagination Technologies Ltd. > > > - */ > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > - > > > - .align 5 > > > -NESTED(handle_sys, PT_SIZE, sp) > > > - .set noat > > > - SAVE_SOME > > > - TRACE_IRQS_ON_RELOAD > > > - STI > > > - .set at > > > - > > > - lw t1, PT_EPC(sp) # skip syscall on return > > > - > > > - addiu t1, 4 # skip to next instruction > > > - sw t1, PT_EPC(sp) > > > - > > > - sw a3, PT_R26(sp) # save a3 for syscall restartin= g > > > - > > > - /* > > > - * More than four arguments. Try to deal with it by copying th= e > > > - * stack arguments from the user stack to the kernel stack. > > > - * This Sucks (TM). > > > - */ > > > - lw t0, PT_R29(sp) # get old user stack pointer > > > - > > > - /* > > > - * We intentionally keep the kernel stack a little below the to= p of > > > - * userspace so we don't have to do a slower byte accurate chec= k here. > > > - */ > > > - addu t4, t0, 32 > > > - bltz t4, bad_stack # -> sp is bad > > > - > > > - /* > > > - * Ok, copy the args from the luser stack to the kernel stack. > > > - */ > > > - > > > - .set push > > > - .set noreorder > > > - .set nomacro > > > - > > > -load_a4: user_lw(t5, 16(t0)) # argument #5 from usp > > > -load_a5: user_lw(t6, 20(t0)) # argument #6 from usp > > > -load_a6: user_lw(t7, 24(t0)) # argument #7 from usp > > > -load_a7: user_lw(t8, 28(t0)) # argument #8 from usp > > > -loads_done: > > > - > > > - sw t5, 16(sp) # argument #5 to ksp > > > - sw t6, 20(sp) # argument #6 to ksp > > > - sw t7, 24(sp) # argument #7 to ksp > > > - sw t8, 28(sp) # argument #8 to ksp > > > - .set pop > > > - > > > - .section __ex_table,"a" > > > - PTR load_a4, bad_stack_a4 > > > - PTR load_a5, bad_stack_a5 > > > - PTR load_a6, bad_stack_a6 > > > - PTR load_a7, bad_stack_a7 > > > - .previous > > > - > > > - lw t0, TI_FLAGS($28) # syscall tracing enabled? > > > - li t1, _TIF_WORK_SYSCALL_ENTRY > > > - and t0, t1 > > > - bnez t0, syscall_trace_entry # -> yes > > > -syscall_common: > > > - subu v0, v0, __NR_O32_Linux # check syscall number > > > - sltiu t0, v0, __NR_O32_Linux_syscalls > > > - beqz t0, illegal_syscall > > > - > > > - sll t0, v0, 2 > > > - la t1, sys_call_table > > > - addu t1, t0 > > > - lw t2, (t1) # syscall routine > > > - > > > - beqz t2, illegal_syscall > > > - > > > - jalr t2 # Do The Real Thing (TM) > > > - > > > - li t0, -EMAXERRNO - 1 # error? > > > - sltu t0, t0, v0 > > > - sw t0, PT_R7(sp) # set error flag > > > - beqz t0, 1f > > > - > > > - lw t1, PT_R2(sp) # syscall number > > > - negu v0 # error > > > - sw t1, PT_R0(sp) # save it for syscall restartin= g > > > -1: sw v0, PT_R2(sp) # result > > > - > > > -o32_syscall_exit: > > > - j syscall_exit_partial > > > - > > > -/* -----------------------------------------------------------------= ------- */ > > > - > > > -syscall_trace_entry: > > > - SAVE_STATIC > > > - move a0, sp > > > - > > > - /* > > > - * syscall number is in v0 unless we called syscall(__NR_###) > > > - * where the real syscall number is in a0 > > > - */ > > > - move a1, v0 > > > - subu t2, v0, __NR_O32_Linux > > > - bnez t2, 1f /* __NR_syscall at offset 0 */ > > > - lw a1, PT_R4(sp) > > > - > > > -1: jal syscall_trace_enter > > > - > > > - bltz v0, 1f # seccomp failed? Skip syscall > > > - > > > - RESTORE_STATIC > > > - lw v0, PT_R2(sp) # Restore syscall (maybe modifi= ed) > > > - lw a0, PT_R4(sp) # Restore argument registers > > > - lw a1, PT_R5(sp) > > > - lw a2, PT_R6(sp) > > > - lw a3, PT_R7(sp) > > > - j syscall_common > > > - > > > -1: j syscall_exit > > > - > > > -/* -----------------------------------------------------------------= ------- */ > > > - > > > - /* > > > - * Our open-coded access area sanity test for the stack pointer > > > - * failed. We probably should handle this case a bit more drast= ic. > > > - */ > > > -bad_stack: > > > - li v0, EFAULT > > > - sw v0, PT_R2(sp) > > > - li t0, 1 # set error flag > > > - sw t0, PT_R7(sp) > > > - j o32_syscall_exit > > > - > > > -bad_stack_a4: > > > - li t5, 0 > > > - b load_a5 > > > - > > > -bad_stack_a5: > > > - li t6, 0 > > > - b load_a6 > > > - > > > -bad_stack_a6: > > > - li t7, 0 > > > - b load_a7 > > > - > > > -bad_stack_a7: > > > - li t8, 0 > > > - b loads_done > > > - > > > - /* > > > - * The system call does not exist in this kernel > > > - */ > > > -illegal_syscall: > > > - li v0, ENOSYS # error > > > - sw v0, PT_R2(sp) > > > - li t0, 1 # set error flag > > > - sw t0, PT_R7(sp) > > > - j o32_syscall_exit > > > - END(handle_sys) > > > - > > > - LEAF(sys_syscall) > > > - subu t0, a0, __NR_O32_Linux # check syscall number > > > - sltiu v0, t0, __NR_O32_Linux_syscalls > > > - beqz t0, einval # do not recurse > > > - sll t1, t0, 2 > > > - beqz v0, einval > > > - lw t2, sys_call_table(t1) # syscall routine > > > - > > > - move a0, a1 # shift argument regist= ers > > > - move a1, a2 > > > - move a2, a3 > > > - lw a3, 16(sp) > > > - lw t4, 20(sp) > > > - lw t5, 24(sp) > > > - lw t6, 28(sp) > > > - sw t4, 16(sp) > > > - sw t5, 20(sp) > > > - sw t6, 24(sp) > > > - jr t2 > > > - /* Unreached */ > > > - > > > -einval: li v0, -ENOSYS > > > - jr ra > > > - END(sys_syscall) > > > - > > > -#ifdef CONFIG_MIPS_MT_FPAFF > > > - /* > > > - * For FPU affinity scheduling on MIPS MT processors, we need t= o > > > - * intercept sys_sched_xxxaffinity() calls until we get a prope= r hook > > > - * in kernel/sched/core.c. Considered only temporary we only s= upport > > > - * these hooks for the 32-bit kernel - there is no MIPS64 MT pr= ocessor > > > - * atm. > > > - */ > > > -#define sys_sched_setaffinity mipsmt_sys_sched_setaffinity > > > -#define sys_sched_getaffinity mipsmt_sys_sched_getaffinity > > > -#endif /* CONFIG_MIPS_MT_FPAFF */ > > > - > > > -#define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, n= ative) > > > -#define __SYSCALL(nr, entry) PTR entry > > > - .align 2 > > > - .type sys_call_table, @object > > > -EXPORT(sys_call_table) > > > -#include > > > diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall6= 4-n32.S > > > deleted file mode 100644 > > > index f650c55a17dc..000000000000 > > > --- a/arch/mips/kernel/scall64-n32.S > > > +++ /dev/null > > > @@ -1,107 +0,0 @@ > > > -/* > > > - * This file is subject to the terms and conditions of the GNU Gener= al Public > > > - * License. See the file "COPYING" in the main directory of this ar= chive > > > - * for more details. > > > - * > > > - * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01 by Ralf Baechle > > > - * Copyright (C) 1999, 2000 Silicon Graphics, Inc. > > > - * Copyright (C) 2001 MIPS Technologies, Inc. > > > - */ > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > - > > > -#ifndef CONFIG_MIPS32_O32 > > > -/* No O32, so define handle_sys here */ > > > -#define handle_sysn32 handle_sys > > > -#endif > > > - > > > - .align 5 > > > -NESTED(handle_sysn32, PT_SIZE, sp) > > > -#ifndef CONFIG_MIPS32_O32 > > > - .set noat > > > - SAVE_SOME > > > - TRACE_IRQS_ON_RELOAD > > > - STI > > > - .set at > > > -#endif > > > - > > > - dsubu t0, v0, __NR_N32_Linux # check syscall number > > > - sltiu t0, t0, __NR_N32_Linux_syscalls > > > - > > > -#ifndef CONFIG_MIPS32_O32 > > > - ld t1, PT_EPC(sp) # skip syscall on return > > > - daddiu t1, 4 # skip to next instruction > > > - sd t1, PT_EPC(sp) > > > -#endif > > > - beqz t0, not_n32_scall > > > - > > > - sd a3, PT_R26(sp) # save a3 for syscall restartin= g > > > - > > > - li t1, _TIF_WORK_SYSCALL_ENTRY > > > - LONG_L t0, TI_FLAGS($28) # syscall tracing enabled? > > > - and t0, t1, t0 > > > - bnez t0, n32_syscall_trace_entry > > > - > > > -syscall_common: > > > - dsll t0, v0, 3 # offset into table > > > - ld t2, (sysn32_call_table - (__NR_N32_Linux * 8))(t0) > > > - > > > - jalr t2 # Do The Real Thing (TM) > > > - > > > - li t0, -EMAXERRNO - 1 # error? > > > - sltu t0, t0, v0 > > > - sd t0, PT_R7(sp) # set error flag > > > - beqz t0, 1f > > > - > > > - ld t1, PT_R2(sp) # syscall number > > > - dnegu v0 # error > > > - sd t1, PT_R0(sp) # save it for syscall restartin= g > > > -1: sd v0, PT_R2(sp) # result > > > - > > > - j syscall_exit_partial > > > - > > > -/* -----------------------------------------------------------------= ------- */ > > > - > > > -n32_syscall_trace_entry: > > > - SAVE_STATIC > > > - move a0, sp > > > - move a1, v0 > > > - jal syscall_trace_enter > > > - > > > - bltz v0, 1f # seccomp failed? Skip syscall > > > - > > > - RESTORE_STATIC > > > - ld v0, PT_R2(sp) # Restore syscall (maybe modifi= ed) > > > - ld a0, PT_R4(sp) # Restore argument registers > > > - ld a1, PT_R5(sp) > > > - ld a2, PT_R6(sp) > > > - ld a3, PT_R7(sp) > > > - ld a4, PT_R8(sp) > > > - ld a5, PT_R9(sp) > > > - > > > - dsubu t2, v0, __NR_N32_Linux # check (new) syscall number > > > - sltiu t0, t2, __NR_N32_Linux_syscalls > > > - beqz t0, not_n32_scall > > > - > > > - j syscall_common > > > - > > > -1: j syscall_exit > > > - > > > -not_n32_scall: > > > - /* This is not an n32 compatibility syscall, pass it on to > > > - the n64 syscall handlers. */ > > > - j handle_sys64 > > > - > > > - END(handle_sysn32) > > > - > > > -#define __SYSCALL(nr, entry) PTR entry > > > - .type sysn32_call_table, @object > > > -EXPORT(sysn32_call_table) > > > -#include > > > diff --git a/arch/mips/kernel/scall64-n64.S b/arch/mips/kernel/scall6= 4-n64.S > > > deleted file mode 100644 > > > index 5d7bfc65e4d0..000000000000 > > > --- a/arch/mips/kernel/scall64-n64.S > > > +++ /dev/null > > > @@ -1,116 +0,0 @@ > > > -/* > > > - * This file is subject to the terms and conditions of the GNU Gener= al Public > > > - * License. See the file "COPYING" in the main directory of this ar= chive > > > - * for more details. > > > - * > > > - * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01, 02 by Ralf Baechle > > > - * Copyright (C) 1999, 2000 Silicon Graphics, Inc. > > > - * Copyright (C) 2001 MIPS Technologies, Inc. > > > - */ > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > - > > > -#ifndef CONFIG_MIPS32_COMPAT > > > -/* Neither O32 nor N32, so define handle_sys here */ > > > -#define handle_sys64 handle_sys > > > -#endif > > > - > > > - .align 5 > > > -NESTED(handle_sys64, PT_SIZE, sp) > > > -#if !defined(CONFIG_MIPS32_O32) && !defined(CONFIG_MIPS32_N32) > > > - /* > > > - * When 32-bit compatibility is configured scall_o32.S > > > - * already did this. > > > - */ > > > - .set noat > > > - SAVE_SOME > > > - TRACE_IRQS_ON_RELOAD > > > - STI > > > - .set at > > > -#endif > > > - > > > -#if !defined(CONFIG_MIPS32_O32) && !defined(CONFIG_MIPS32_N32) > > > - ld t1, PT_EPC(sp) # skip syscall on return > > > - daddiu t1, 4 # skip to next instruction > > > - sd t1, PT_EPC(sp) > > > -#endif > > > - > > > - sd a3, PT_R26(sp) # save a3 for syscall restartin= g > > > - > > > - li t1, _TIF_WORK_SYSCALL_ENTRY > > > - LONG_L t0, TI_FLAGS($28) # syscall tracing enabled? > > > - and t0, t1, t0 > > > - bnez t0, syscall_trace_entry > > > - > > > -syscall_common: > > > - dsubu t2, v0, __NR_64_Linux > > > - sltiu t0, t2, __NR_64_Linux_syscalls > > > - beqz t0, illegal_syscall > > > - > > > - dsll t0, t2, 3 # offset into table > > > - dla t2, sys_call_table > > > - daddu t0, t2, t0 > > > - ld t2, (t0) # syscall routine > > > - beqz t2, illegal_syscall > > > - > > > - jalr t2 # Do The Real Thing (TM) > > > - > > > - li t0, -EMAXERRNO - 1 # error? > > > - sltu t0, t0, v0 > > > - sd t0, PT_R7(sp) # set error flag > > > - beqz t0, 1f > > > - > > > - ld t1, PT_R2(sp) # syscall number > > > - dnegu v0 # error > > > - sd t1, PT_R0(sp) # save it for syscall restartin= g > > > -1: sd v0, PT_R2(sp) # result > > > - > > > -n64_syscall_exit: > > > - j syscall_exit_partial > > > - > > > -/* -----------------------------------------------------------------= ------- */ > > > - > > > -syscall_trace_entry: > > > - SAVE_STATIC > > > - move a0, sp > > > - move a1, v0 > > > - jal syscall_trace_enter > > > - > > > - bltz v0, 1f # seccomp failed? Skip syscall > > > - > > > - RESTORE_STATIC > > > - ld v0, PT_R2(sp) # Restore syscall (maybe modifi= ed) > > > - ld a0, PT_R4(sp) # Restore argument registers > > > - ld a1, PT_R5(sp) > > > - ld a2, PT_R6(sp) > > > - ld a3, PT_R7(sp) > > > - ld a4, PT_R8(sp) > > > - ld a5, PT_R9(sp) > > > - j syscall_common > > > - > > > -1: j syscall_exit > > > - > > > -illegal_syscall: > > > - /* This also isn't a 64-bit syscall, throw an error. */ > > > - li v0, ENOSYS # error > > > - sd v0, PT_R2(sp) > > > - li t0, 1 # set error flag > > > - sd t0, PT_R7(sp) > > > - j n64_syscall_exit > > > - END(handle_sys64) > > > - > > > -#define __SYSCALL(nr, entry) PTR entry > > > - .align 3 > > > - .type sys_call_table, @object > > > -EXPORT(sys_call_table) > > > -#include > > > diff --git a/arch/mips/kernel/scall64-o32.S b/arch/mips/kernel/scall6= 4-o32.S > > > deleted file mode 100644 > > > index cedc8bd88804..000000000000 > > > --- a/arch/mips/kernel/scall64-o32.S > > > +++ /dev/null > > > @@ -1,221 +0,0 @@ > > > -/* > > > - * This file is subject to the terms and conditions of the GNU Gener= al Public > > > - * License. See the file "COPYING" in the main directory of this ar= chive > > > - * for more details. > > > - * > > > - * Copyright (C) 1995 - 2000, 2001 by Ralf Baechle > > > - * Copyright (C) 1999, 2000 Silicon Graphics, Inc. > > > - * Copyright (C) 2001 MIPS Technologies, Inc. > > > - * Copyright (C) 2004 Thiemo Seufer > > > - * > > > - * Hairy, the userspace application uses a different argument passin= g > > > - * convention than the kernel, so we have to translate things from o= 32 > > > - * to ABI64 calling convention. 64-bit syscalls are also proce= ssed > > > - * here for now. > > > - */ > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > -#include > > > - > > > - .align 5 > > > -NESTED(handle_sys, PT_SIZE, sp) > > > - .set noat > > > - SAVE_SOME > > > - TRACE_IRQS_ON_RELOAD > > > - STI > > > - .set at > > > - ld t1, PT_EPC(sp) # skip syscall on return > > > - > > > - dsubu t0, v0, __NR_O32_Linux # check syscall number > > > - sltiu t0, t0, __NR_O32_Linux_syscalls > > > - daddiu t1, 4 # skip to next instruction > > > - sd t1, PT_EPC(sp) > > > - beqz t0, not_o32_scall > > > -#if 0 > > > - SAVE_ALL > > > - move a1, v0 > > > - ASM_PRINT("Scall %ld\n") > > > - RESTORE_ALL > > > -#endif > > > - > > > - /* We don't want to stumble over broken sign extensions from > > > - userland. O32 does never use the upper half. */ > > > - sll a0, a0, 0 > > > - sll a1, a1, 0 > > > - sll a2, a2, 0 > > > - sll a3, a3, 0 > > > - > > > - sd a3, PT_R26(sp) # save a3 for syscall restartin= g > > > - > > > - /* > > > - * More than four arguments. Try to deal with it by copying th= e > > > - * stack arguments from the user stack to the kernel stack. > > > - * This Sucks (TM). > > > - * > > > - * We intentionally keep the kernel stack a little below the to= p of > > > - * userspace so we don't have to do a slower byte accurate chec= k here. > > > - */ > > > - ld t0, PT_R29(sp) # get old user stack pointer > > > - daddu t1, t0, 32 > > > - bltz t1, bad_stack > > > - > > > -load_a4: lw a4, 16(t0) # argument #5 from usp > > > -load_a5: lw a5, 20(t0) # argument #6 from usp > > > -load_a6: lw a6, 24(t0) # argument #7 from usp > > > -load_a7: lw a7, 28(t0) # argument #8 from usp > > > -loads_done: > > > - > > > - .section __ex_table,"a" > > > - PTR load_a4, bad_stack_a4 > > > - PTR load_a5, bad_stack_a5 > > > - PTR load_a6, bad_stack_a6 > > > - PTR load_a7, bad_stack_a7 > > > - .previous > > > - > > > - li t1, _TIF_WORK_SYSCALL_ENTRY > > > - LONG_L t0, TI_FLAGS($28) # syscall tracing enabled? > > > - and t0, t1, t0 > > > - bnez t0, trace_a_syscall > > > - > > > -syscall_common: > > > - dsll t0, v0, 3 # offset into table > > > - ld t2, (sys32_call_table - (__NR_O32_Linux * 8))(t0) > > > - > > > - jalr t2 # Do The Real Thing (TM) > > > - > > > - li t0, -EMAXERRNO - 1 # error? > > > - sltu t0, t0, v0 > > > - sd t0, PT_R7(sp) # set error flag > > > - beqz t0, 1f > > > - > > > - ld t1, PT_R2(sp) # syscall number > > > - dnegu v0 # error > > > - sd t1, PT_R0(sp) # save it for syscall restartin= g > > > -1: sd v0, PT_R2(sp) # result > > > - > > > -o32_syscall_exit: > > > - j syscall_exit_partial > > > - > > > -/* -----------------------------------------------------------------= ------- */ > > > - > > > -trace_a_syscall: > > > - SAVE_STATIC > > > - sd a4, PT_R8(sp) # Save argument registers > > > - sd a5, PT_R9(sp) > > > - sd a6, PT_R10(sp) > > > - sd a7, PT_R11(sp) # For indirect syscalls > > > - > > > - move a0, sp > > > - /* > > > - * absolute syscall number is in v0 unless we called syscall(__= NR_###) > > > - * where the real syscall number is in a0 > > > - * note: NR_syscall is the first O32 syscall but the macro is > > > - * only defined when compiling with -mabi=3D32 (CONFIG_32BIT) > > > - * therefore __NR_O32_Linux is used (4000) > > > - */ > > > - .set push > > > - .set reorder > > > - subu t1, v0, __NR_O32_Linux > > > - move a1, v0 > > > - bnez t1, 1f /* __NR_syscall at offset 0 */ > > > - ld a1, PT_R4(sp) /* Arg1 for __NR_syscall case */ > > > - .set pop > > > - > > > -1: jal syscall_trace_enter > > > - > > > - bltz v0, 1f # seccomp failed? Skip syscall > > > - > > > - RESTORE_STATIC > > > - ld v0, PT_R2(sp) # Restore syscall (maybe modifi= ed) > > > - ld a0, PT_R4(sp) # Restore argument registers > > > - ld a1, PT_R5(sp) > > > - ld a2, PT_R6(sp) > > > - ld a3, PT_R7(sp) > > > - ld a4, PT_R8(sp) > > > - ld a5, PT_R9(sp) > > > - ld a6, PT_R10(sp) > > > - ld a7, PT_R11(sp) # For indirect syscalls > > > - > > > - dsubu t0, v0, __NR_O32_Linux # check (new) syscall number > > > - sltiu t0, t0, __NR_O32_Linux_syscalls > > > - beqz t0, not_o32_scall > > > - > > > - j syscall_common > > > - > > > -1: j syscall_exit > > > - > > > -/* -----------------------------------------------------------------= ------- */ > > > - > > > - /* > > > - * The stackpointer for a call with more than 4 arguments is ba= d. > > > - */ > > > -bad_stack: > > > - li v0, EFAULT > > > - sd v0, PT_R2(sp) > > > - li t0, 1 # set error flag > > > - sd t0, PT_R7(sp) > > > - j o32_syscall_exit > > > - > > > -bad_stack_a4: > > > - li a4, 0 > > > - b load_a5 > > > - > > > -bad_stack_a5: > > > - li a5, 0 > > > - b load_a6 > > > - > > > -bad_stack_a6: > > > - li a6, 0 > > > - b load_a7 > > > - > > > -bad_stack_a7: > > > - li a7, 0 > > > - b loads_done > > > - > > > -not_o32_scall: > > > - /* > > > - * This is not an o32 compatibility syscall, pass it on > > > - * to the 64-bit syscall handlers. > > > - */ > > > -#ifdef CONFIG_MIPS32_N32 > > > - j handle_sysn32 > > > -#else > > > - j handle_sys64 > > > -#endif > > > - END(handle_sys) > > > - > > > -LEAF(sys32_syscall) > > > - subu t0, a0, __NR_O32_Linux # check syscall number > > > - sltiu v0, t0, __NR_O32_Linux_syscalls > > > - beqz t0, einval # do not recurse > > > - dsll t1, t0, 3 > > > - beqz v0, einval > > > - ld t2, sys32_call_table(t1) # syscall routi= ne > > > - > > > - move a0, a1 # shift argument registers > > > - move a1, a2 > > > - move a2, a3 > > > - move a3, a4 > > > - move a4, a5 > > > - move a5, a6 > > > - move a6, a7 > > > - jr t2 > > > - /* Unreached */ > > > - > > > -einval: li v0, -ENOSYS > > > - jr ra > > > - END(sys32_syscall) > > > - > > > -#define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, c= ompat) > > > -#define __SYSCALL(nr, entry) PTR entry > > > - .align 3 > > > - .type sys32_call_table,@object > > > -EXPORT(sys32_call_table) > > > -#include > > > diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c > > > index f1e985109da0..1ec6a0cf1163 100644 > > > --- a/arch/mips/kernel/signal.c > > > +++ b/arch/mips/kernel/signal.c > > > @@ -32,7 +32,6 @@ > > > #include > > > #include > > > #include > > > -#include > > > #include > > > #include > > > #include > > > @@ -627,7 +626,7 @@ SYSCALL_DEFINE3(sigaction, int, sig, const struct= sigaction __user *, act, > > > #endif > > > > > > #ifdef CONFIG_TRAD_SIGNALS > > > -asmlinkage void sys_sigreturn(void) > > > +asmlinkage long sys_sigreturn(void) > > > { > > > struct sigframe __user *frame; > > > struct pt_regs *regs; > > > @@ -649,22 +648,16 @@ asmlinkage void sys_sigreturn(void) > > > else if (sig) > > > force_sig(sig); > > > > > > - /* > > > - * Don't let your children do this ... > > > - */ > > > - __asm__ __volatile__( > > > - "move\t$29, %0\n\t" > > > - "j\tsyscall_exit" > > > - : /* no outputs */ > > > - : "r" (regs)); > > > - /* Unreached */ > > > + regs->regs[27] =3D 1; /* return directly */ > > > + return regs->regs[2]; > > > > > > badframe: > > > force_sig(SIGSEGV); > > > + return 0; > > > } > > > #endif /* CONFIG_TRAD_SIGNALS */ > > > > > > -asmlinkage void sys_rt_sigreturn(void) > > > +asmlinkage long sys_rt_sigreturn(void) > > > { > > > struct rt_sigframe __user *frame; > > > struct pt_regs *regs; > > > @@ -689,18 +682,12 @@ asmlinkage void sys_rt_sigreturn(void) > > > if (restore_altstack(&frame->rs_uc.uc_stack)) > > > goto badframe; > > > > > > - /* > > > - * Don't let your children do this ... > > > - */ > > > - __asm__ __volatile__( > > > - "move\t$29, %0\n\t" > > > - "j\tsyscall_exit" > > > - : /* no outputs */ > > > - : "r" (regs)); > > > - /* Unreached */ > > > + regs->regs[27] =3D 1; /* return directly */ > > > + return regs->regs[2]; > > > > > > badframe: > > > force_sig(SIGSEGV); > > > + return 0; > > > } > > > > > > #ifdef CONFIG_TRAD_SIGNALS > > > @@ -852,11 +839,11 @@ static void handle_signal(struct ksignal *ksig,= struct pt_regs *regs) > > > signal_setup_done(ret, ksig, 0); > > > } > > > > > > -static void do_signal(struct pt_regs *regs) > > > +void arch_do_signal_or_restart(struct pt_regs *regs, bool has_signal= ) > > > { > > > struct ksignal ksig; > > > > > > - if (get_signal(&ksig)) { > > > + if (has_signal && get_signal(&ksig)) { > > > /* Whee! Actually deliver the signal. */ > > > handle_signal(&ksig, regs); > > > return; > > > @@ -904,7 +891,7 @@ asmlinkage void do_notify_resume(struct pt_regs *= regs, void *unused, > > > > > > /* deal with pending signal delivery */ > > > if (thread_info_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) > > > - do_signal(regs); > > > + arch_do_signal_or_restart(regs, thread_info_flags & _TI= F_SIGPENDING); > > > > > > if (thread_info_flags & _TIF_NOTIFY_RESUME) { > > > tracehook_notify_resume(regs); > > > diff --git a/arch/mips/kernel/signal_n32.c b/arch/mips/kernel/signal_= n32.c > > > index 7bd00fad61af..b52b995a8a9b 100644 > > > --- a/arch/mips/kernel/signal_n32.c > > > +++ b/arch/mips/kernel/signal_n32.c > > > @@ -19,7 +19,6 @@ > > > #include > > > #include > > > #include > > > -#include > > > #include > > > #include > > > #include > > > @@ -51,7 +50,7 @@ struct rt_sigframe_n32 { > > > struct ucontextn32 rs_uc; > > > }; > > > > > > -asmlinkage void sysn32_rt_sigreturn(void) > > > +asmlinkage long sysn32_rt_sigreturn(void) > > > { > > > struct rt_sigframe_n32 __user *frame; > > > struct pt_regs *regs; > > > @@ -76,18 +75,12 @@ asmlinkage void sysn32_rt_sigreturn(void) > > > if (compat_restore_altstack(&frame->rs_uc.uc_stack)) > > > goto badframe; > > > > > > - /* > > > - * Don't let your children do this ... > > > - */ > > > - __asm__ __volatile__( > > > - "move\t$29, %0\n\t" > > > - "j\tsyscall_exit" > > > - : /* no outputs */ > > > - : "r" (regs)); > > > - /* Unreached */ > > > + regs->regs[27] =3D 1; /* return directly */ > > > + return regs->regs[2]; > > > > > > badframe: > > > force_sig(SIGSEGV); > > > + return 0; > > > } > > > > > > static int setup_rt_frame_n32(void *sig_return, struct ksignal *ksi= g, > > > diff --git a/arch/mips/kernel/signal_o32.c b/arch/mips/kernel/signal_= o32.c > > > index 299a7a28ca33..9245806e06f1 100644 > > > --- a/arch/mips/kernel/signal_o32.c > > > +++ b/arch/mips/kernel/signal_o32.c > > > @@ -17,7 +17,6 @@ > > > #include > > > #include > > > #include > > > -#include > > > #include > > > > > > #include "signal-common.h" > > > @@ -151,7 +150,7 @@ static int setup_frame_32(void *sig_return, struc= t ksignal *ksig, > > > return 0; > > > } > > > > > > -asmlinkage void sys32_rt_sigreturn(void) > > > +asmlinkage long sys32_rt_sigreturn(void) > > > { > > > struct rt_sigframe32 __user *frame; > > > struct pt_regs *regs; > > > @@ -176,18 +175,12 @@ asmlinkage void sys32_rt_sigreturn(void) > > > if (compat_restore_altstack(&frame->rs_uc.uc_stack)) > > > goto badframe; > > > > > > - /* > > > - * Don't let your children do this ... > > > - */ > > > - __asm__ __volatile__( > > > - "move\t$29, %0\n\t" > > > - "j\tsyscall_exit" > > > - : /* no outputs */ > > > - : "r" (regs)); > > > - /* Unreached */ > > > + regs->regs[27] =3D 1; /* return directly */ > > > + return regs->regs[2]; > > > > > > badframe: > > > force_sig(SIGSEGV); > > > + return 0; > > > } > > > > > > static int setup_rt_frame_32(void *sig_return, struct ksignal *ksig= , > > > @@ -253,7 +246,7 @@ struct mips_abi mips_abi_32 =3D { > > > }; > > > > > > > > > -asmlinkage void sys32_sigreturn(void) > > > +asmlinkage long sys32_sigreturn(void) > > > { > > > struct sigframe32 __user *frame; > > > struct pt_regs *regs; > > > @@ -275,16 +268,10 @@ asmlinkage void sys32_sigreturn(void) > > > else if (sig) > > > force_sig(sig); > > > > > > - /* > > > - * Don't let your children do this ... > > > - */ > > > - __asm__ __volatile__( > > > - "move\t$29, %0\n\t" > > > - "j\tsyscall_exit" > > > - : /* no outputs */ > > > - : "r" (regs)); > > > - /* Unreached */ > > > + regs->regs[27] =3D 1; /* return directly */ > > > + return regs->regs[2]; > > > > > > badframe: > > > force_sig(SIGSEGV); > > > + return 0; > > > } > > > diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c > > > index 2afa3eef486a..6dc78648b274 100644 > > > --- a/arch/mips/kernel/syscall.c > > > +++ b/arch/mips/kernel/syscall.c > > > @@ -8,6 +8,7 @@ > > > * Copyright (C) 2001 MIPS Technologies, Inc. > > > */ > > > #include > > > +#include > > > #include > > > #include > > > #include > > > @@ -35,9 +36,9 @@ > > > #include > > > #include > > > #include > > > -#include > > > #include > > > #include > > > +#include > > > #include > > > #include > > > > > > @@ -79,10 +80,6 @@ SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, u= nsigned long, len, > > > pgoff >> (PAGE_SHIFT - 12)); > > > } > > > > > > -save_static_function(sys_fork); > > > -save_static_function(sys_clone); > > > -save_static_function(sys_clone3); > > > - > > > SYSCALL_DEFINE1(set_thread_area, unsigned long, addr) > > > { > > > struct thread_info *ti =3D task_thread_info(current); > > > @@ -182,28 +179,11 @@ static inline int mips_atomic_set(unsigned long= addr, unsigned long new) > > > return err; > > > > > > regs =3D current_pt_regs(); > > > - regs->regs[2] =3D old; > > > - regs->regs[7] =3D 0; /* No error */ > > > - > > > - /* > > > - * Don't let your children do this ... > > > - */ > > > - __asm__ __volatile__( > > > - " move $29, %0 = \n" > > > - " j syscall_exit = \n" > > > - : /* no outputs */ > > > - : "r" (regs)); > > > - > > > - /* unreached. Honestly. */ > > > - unreachable(); > > > + regs->regs[7] =3D 0; /* no error */ > > > + regs->regs[27] =3D 1; /* return directly */ > > > + return old; > > > } > > > > > > -/* > > > - * mips_atomic_set() normally returns directly via syscall_exit pote= ntially > > > - * clobbering static registers, so be sure to preserve them. > > > - */ > > > -save_static_function(sys_sysmips); > > > - > > > SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2) > > > { > > > switch (cmd) { > > > @@ -249,3 +229,120 @@ asmlinkage void bad_stack(void) > > > { > > > do_exit(SIGSEGV); > > > } > > > + > > > +#if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32) > > > +static inline int get_args(struct pt_regs *regs) > > > +{ > > > + int *usp =3D (int *)regs->regs[29]; > > > + > > > +#ifdef CONFIG_MIPS32_O32 > > > + /* > > > + * Hairy, the userspace application uses a different argument p= assing > > > + * convention than the kernel, so we have to translate things f= rom o32 > > > + * to ABI64 calling convention. > > > + * > > > + * We don't want to stumble over broken sign extensions from us= erland. > > > + * O32 does never use the upper half. > > > + */ > > > + regs->regs[4] =3D (int)regs->regs[4]; > > > + regs->regs[5] =3D (int)regs->regs[5]; > > > + regs->regs[6] =3D (int)regs->regs[6]; > > > + regs->regs[7] =3D (int)regs->regs[7]; > > > +#endif > > > + > > > + /* > > > + * More than four arguments. Try to deal with it by copying th= e > > > + * stack arguments from the user stack to the kernel stack. > > > + * This Sucks (TM). > > > + * > > > + * We intentionally keep the kernel stack a little below the to= p of > > > + * userspace so we don't have to do a slower byte accurate chec= k here. > > > + */ > > > + if (!access_ok(usp, 32)) > > > + return -1; > > > + > > > + get_user(regs->regs[8], usp + 4); > > > + get_user(regs->regs[9], usp + 5); > > > + get_user(regs->regs[10], usp + 6); > > > + get_user(regs->regs[11], usp + 7); > > > + > > > + return 0; > > > +} > > > +#endif > > > + > > > +typedef long (*sys_call_fn)(unsigned long, unsigned long, > > > + unsigned long, unsigned long, unsigned long, unsigned long); > > > + > > > +void noinstr do_syscall(struct pt_regs *regs) > > > +{ > > > + unsigned long nr; > > > + unsigned long ret; > > > + sys_call_fn syscall_fn =3D NULL; > > > + > > > + nr =3D regs->regs[2]; > > > + current_thread_info()->syscall =3D nr; > > > + nr =3D syscall_enter_from_user_mode(regs, nr); > > > + > > > + regs->cp0_epc +=3D 4; /* skip syscall on return */ > > > + /* skip to next instruction */ > > > + regs->regs[26] =3D regs->regs[7]; /* save a3 for syscall restar= ting */ > > > + regs->regs[27] =3D 0; /* do not return directly */ > > > + > > > +#ifdef CONFIG_32BIT > > > + if (nr >=3D __NR_O32_Linux && nr < __NR_O32_Linux + __NR_O32_Li= nux_syscalls) { > > > + if (get_args(regs) < 0) { > > > + ret =3D EFAULT; > > > + goto error; > > > + } > > > + syscall_fn =3D (sys_call_fn)sys_call_table[nr - __NR_O3= 2_Linux]; > > > + } > > > +#endif > > > + > > > +#ifdef CONFIG_MIPS32_O32 > > > + if (nr >=3D __NR_O32_Linux && nr < __NR_O32_Linux + __NR_O32_Li= nux_syscalls) { > > > + if (get_args(regs) < 0) { > > > + ret =3D EFAULT; > > > + goto error; > > > + } > > > + syscall_fn =3D (sys_call_fn)sys32_call_table[nr - __NR_= O32_Linux]; > > > + } > > > +#endif > > > + > > > +#ifdef CONFIG_MIPS32_N32 > > > + if (nr >=3D __NR_N32_Linux && nr < __NR_N32_Linux + __NR_N32_Li= nux_syscalls) > > > + syscall_fn =3D (sys_call_fn)sysn32_call_table[nr - __NR= _N32_Linux]; > > > +#endif > > > + > > > +#ifdef CONFIG_64BIT > > > + if (nr >=3D __NR_64_Linux && nr < __NR_64_Linux + __NR_64_Linux= _syscalls) > > > + syscall_fn =3D (sys_call_fn)sys_call_table[nr - __NR_64= _Linux]; > > > +#endif > > > + > > > + if (!syscall_fn) { > > > + ret =3D ENOSYS; > > > + goto error; > > > + } > > > + > > > + ret =3D syscall_fn(regs->regs[4], regs->regs[5], regs->regs[6], > > > + regs->regs[7], regs->regs[8], regs->regs[9]); > > > + > > > + if (regs->regs[27]) /* return directly? */ > > > + goto out; > > > + > > > + regs->regs[7] =3D 0; /* clear error flag */ > > > + if (ret >=3D -EMAXERRNO - 1) { /* error? */ > > > + regs->regs[0] =3D nr; /* save syscall number */ > > > + /* for syscall restarting */ > > > + ret =3D -ret; > > > + goto error; > > > + } > > > + > > > + goto out; > > > + > > > +error: > > > + regs->regs[7] =3D 1; /* set error flag */ > > > + > > > +out: > > > + regs->regs[2] =3D ret; > > > + syscall_exit_to_user_mode(regs); > > > +} > > > diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/ke= rnel/syscalls/syscall_n32.tbl > > > index 70e32de2bcaa..d9ae765e51f1 100644 > > > --- a/arch/mips/kernel/syscalls/syscall_n32.tbl > > > +++ b/arch/mips/kernel/syscalls/syscall_n32.tbl > > > @@ -62,8 +62,8 @@ > > > 52 n32 socketpair sys_socketpair > > > 53 n32 setsockopt sys_setsockopt > > > 54 n32 getsockopt sys_getsockopt > > > -55 n32 clone __sys_clone > > > -56 n32 fork __sys_fork > > > +55 n32 clone sys_clone > > > +56 n32 fork sys_fork > > > 57 n32 execve compat_sys_execve > > > 58 n32 exit sys_exit > > > 59 n32 wait4 compat_sys_wait4 > > > @@ -207,7 +207,7 @@ > > > 196 n32 sched_getaffinity compat_sys_sched_getaff= inity > > > 197 n32 cacheflush sys_cacheflush > > > 198 n32 cachectl sys_cachectl > > > -199 n32 sysmips __sys_sysmips > > > +199 n32 sysmips sys_sysmips > > > 200 n32 io_setup compat_sys_io_setup > > > 201 n32 io_destroy sys_io_destroy > > > 202 n32 io_getevents sys_io_getevents_time32 > > > @@ -373,7 +373,7 @@ > > > 432 n32 fsmount sys_fsmount > > > 433 n32 fspick sys_fspick > > > 434 n32 pidfd_open sys_pidfd_open > > > -435 n32 clone3 __sys_clone3 > > > +435 n32 clone3 sys_clone3 > > > 436 n32 close_range sys_close_range > > > 437 n32 openat2 sys_openat2 > > > 438 n32 pidfd_getfd sys_pidfd_getfd > > > diff --git a/arch/mips/kernel/syscalls/syscall_n64.tbl b/arch/mips/ke= rnel/syscalls/syscall_n64.tbl > > > index 1ca7bc337932..edec3e82d67a 100644 > > > --- a/arch/mips/kernel/syscalls/syscall_n64.tbl > > > +++ b/arch/mips/kernel/syscalls/syscall_n64.tbl > > > @@ -62,8 +62,8 @@ > > > 52 n64 socketpair sys_socketpair > > > 53 n64 setsockopt sys_setsockopt > > > 54 n64 getsockopt sys_getsockopt > > > -55 n64 clone __sys_clone > > > -56 n64 fork __sys_fork > > > +55 n64 clone sys_clone > > > +56 n64 fork sys_fork > > > 57 n64 execve sys_execve > > > 58 n64 exit sys_exit > > > 59 n64 wait4 sys_wait4 > > > @@ -207,7 +207,7 @@ > > > 196 n64 sched_getaffinity sys_sched_getaffinity > > > 197 n64 cacheflush sys_cacheflush > > > 198 n64 cachectl sys_cachectl > > > -199 n64 sysmips __sys_sysmips > > > +199 n64 sysmips sys_sysmips > > > 200 n64 io_setup sys_io_setup > > > 201 n64 io_destroy sys_io_destroy > > > 202 n64 io_getevents sys_io_getevents > > > @@ -349,7 +349,7 @@ > > > 432 n64 fsmount sys_fsmount > > > 433 n64 fspick sys_fspick > > > 434 n64 pidfd_open sys_pidfd_open > > > -435 n64 clone3 __sys_clone3 > > > +435 n64 clone3 sys_clone3 > > > 436 n64 close_range sys_close_range > > > 437 n64 openat2 sys_openat2 > > > 438 n64 pidfd_getfd sys_pidfd_getfd > > > diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/ke= rnel/syscalls/syscall_o32.tbl > > > index a61c35edaa74..89a1f267da6a 100644 > > > --- a/arch/mips/kernel/syscalls/syscall_o32.tbl > > > +++ b/arch/mips/kernel/syscalls/syscall_o32.tbl > > > @@ -9,7 +9,7 @@ > > > # > > > 0 o32 syscall sys_syscall = sys32_syscall > > > 1 o32 exit sys_exit > > > -2 o32 fork __sys_fork > > > +2 o32 fork sys_fork > > > 3 o32 read sys_read > > > 4 o32 write sys_write > > > 5 o32 open sys_open = compat_sys_open > > > @@ -131,7 +131,7 @@ > > > 117 o32 ipc sys_ipc = compat_sys_ipc > > > 118 o32 fsync sys_fsync > > > 119 o32 sigreturn sys_sigreturn = sys32_sigreturn > > > -120 o32 clone __sys_clone > > > +120 o32 clone sys_clone > > > 121 o32 setdomainname sys_setdomainname > > > 122 o32 uname sys_newuname > > > 123 o32 modify_ldt sys_ni_syscall > > > @@ -160,7 +160,7 @@ > > > 146 o32 writev sys_writev > > > 147 o32 cacheflush sys_cacheflush > > > 148 o32 cachectl sys_cachectl > > > -149 o32 sysmips __sys_sysmips > > > +149 o32 sysmips sys_sysmips > > > 150 o32 unused150 sys_ni_syscall > > > 151 o32 getsid sys_getsid > > > 152 o32 fdatasync sys_fdatasync > > > @@ -422,7 +422,7 @@ > > > 432 o32 fsmount sys_fsmount > > > 433 o32 fspick sys_fspick > > > 434 o32 pidfd_open sys_pidfd_open > > > -435 o32 clone3 __sys_clone3 > > > +435 o32 clone3 sys_clone3 > > > 436 o32 close_range sys_close_range > > > 437 o32 openat2 sys_openat2 > > > 438 o32 pidfd_getfd sys_pidfd_getfd