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cc6622730b
Similar to syscall_set_arguments() that complements syscall_get_arguments(), introduce syscall_set_nr() that complements syscall_get_nr(). syscall_set_nr() is going to be needed along with syscall_set_arguments() on all HAVE_ARCH_TRACEHOOK architectures to implement PTRACE_SET_SYSCALL_INFO API. Link: https://lkml.kernel.org/r/20250303112020.GD24170@strace.io Signed-off-by: Dmitry V. Levin <ldv@strace.io> Tested-by: Charlie Jenkins <charlie@rivosinc.com> Reviewed-by: Charlie Jenkins <charlie@rivosinc.com> Acked-by: Helge Deller <deller@gmx.de> # parisc Reviewed-by: Maciej W. Rozycki <macro@orcam.me.uk> # mips Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Alexey Gladkov (Intel) <legion@kernel.org> Cc: Andreas Larsson <andreas@gaisler.com> Cc: anton ivanov <anton.ivanov@cambridgegreys.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Betkov <bp@alien8.de> Cc: Brian Cain <bcain@quicinc.com> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Christian Zankel <chris@zankel.net> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Davide Berardi <berardi.dav@gmail.com> Cc: David S. Miller <davem@davemloft.net> Cc: Dinh Nguyen <dinguyen@kernel.org> Cc: Eugene Syromiatnikov <esyr@redhat.com> Cc: Eugene Syromyatnikov <evgsyr@gmail.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Jonas Bonn <jonas@southpole.se> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Naveen N Rao <naveen@kernel.org> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Renzo Davoi <renzo@cs.unibo.it> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russel King <linux@armlinux.org.uk> Cc: Shuah Khan <shuah@kernel.org> Cc: Stafford Horne <shorne@gmail.com> Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Thomas Gleinxer <tglx@linutronix.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vineet Gupta <vgupta@kernel.org> Cc: WANG Xuerui <kernel@xen0n.name> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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* Copyright 2015 Regents of the University of California, Berkeley
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*
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* See asm-generic/syscall.h for descriptions of what we must do here.
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*/
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#ifndef _ASM_RISCV_SYSCALL_H
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#define _ASM_RISCV_SYSCALL_H
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#include <asm/hwprobe.h>
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#include <uapi/linux/audit.h>
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#include <linux/sched.h>
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#include <linux/err.h>
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/* The array of function pointers for syscalls. */
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extern void * const sys_call_table[];
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extern void * const compat_sys_call_table[];
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/*
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* Only the low 32 bits of orig_r0 are meaningful, so we return int.
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* This importantly ignores the high bits on 64-bit, so comparisons
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* sign-extend the low 32 bits.
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*/
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static inline int syscall_get_nr(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->a7;
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}
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static inline void syscall_set_nr(struct task_struct *task,
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struct pt_regs *regs,
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int nr)
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{
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regs->a7 = nr;
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}
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static inline void syscall_rollback(struct task_struct *task,
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struct pt_regs *regs)
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{
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regs->a0 = regs->orig_a0;
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}
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static inline long syscall_get_error(struct task_struct *task,
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struct pt_regs *regs)
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{
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unsigned long error = regs->a0;
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return IS_ERR_VALUE(error) ? error : 0;
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}
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static inline long syscall_get_return_value(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->a0;
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}
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static inline void syscall_set_return_value(struct task_struct *task,
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struct pt_regs *regs,
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int error, long val)
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{
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regs->a0 = (long) error ?: val;
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}
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static inline void syscall_get_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned long *args)
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{
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args[0] = regs->orig_a0;
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args[1] = regs->a1;
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args[2] = regs->a2;
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args[3] = regs->a3;
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args[4] = regs->a4;
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args[5] = regs->a5;
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}
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static inline void syscall_set_arguments(struct task_struct *task,
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struct pt_regs *regs,
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const unsigned long *args)
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{
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regs->orig_a0 = args[0];
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regs->a1 = args[1];
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regs->a2 = args[2];
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regs->a3 = args[3];
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regs->a4 = args[4];
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regs->a5 = args[5];
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}
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static inline int syscall_get_arch(struct task_struct *task)
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{
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#ifdef CONFIG_64BIT
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return AUDIT_ARCH_RISCV64;
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#else
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return AUDIT_ARCH_RISCV32;
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#endif
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}
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typedef long (*syscall_t)(const struct pt_regs *);
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static inline void syscall_handler(struct pt_regs *regs, ulong syscall)
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{
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syscall_t fn;
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#ifdef CONFIG_COMPAT
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if ((regs->status & SR_UXL) == SR_UXL_32)
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fn = compat_sys_call_table[syscall];
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else
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#endif
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fn = sys_call_table[syscall];
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regs->a0 = fn(regs);
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}
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static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs)
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{
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return false;
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}
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asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t);
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asmlinkage long sys_riscv_hwprobe(struct riscv_hwprobe *, size_t, size_t,
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unsigned long *, unsigned int);
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#endif /* _ASM_RISCV_SYSCALL_H */
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