diff options
Diffstat (limited to 'arch/nds32/include/asm/syscall.h')
-rw-r--r-- | arch/nds32/include/asm/syscall.h | 142 |
1 files changed, 0 insertions, 142 deletions
diff --git a/arch/nds32/include/asm/syscall.h b/arch/nds32/include/asm/syscall.h deleted file mode 100644 index 90aa56c94af1..000000000000 --- a/arch/nds32/include/asm/syscall.h +++ /dev/null @@ -1,142 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -// Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved. -// Copyright (C) 2005-2017 Andes Technology Corporation - -#ifndef _ASM_NDS32_SYSCALL_H -#define _ASM_NDS32_SYSCALL_H 1 - -#include <uapi/linux/audit.h> -#include <linux/err.h> -struct task_struct; -struct pt_regs; - -/** - * syscall_get_nr - find what system call a task is executing - * @task: task of interest, must be blocked - * @regs: task_pt_regs() of @task - * - * If @task is executing a system call or is at system call - * tracing about to attempt one, returns the system call number. - * If @task is not executing a system call, i.e. it's blocked - * inside the kernel for a fault or signal, returns -1. - * - * Note this returns int even on 64-bit machines. Only 32 bits of - * system call number can be meaningful. If the actual arch value - * is 64 bits, this truncates to 32 bits so 0xffffffff means -1. - * - * It's only valid to call this when @task is known to be blocked. - */ -static inline int -syscall_get_nr(struct task_struct *task, struct pt_regs *regs) -{ - return regs->syscallno; -} - -/** - * syscall_rollback - roll back registers after an aborted system call - * @task: task of interest, must be in system call exit tracing - * @regs: task_pt_regs() of @task - * - * It's only valid to call this when @task is stopped for system - * call exit tracing (due to TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT), - * after tracehook_report_syscall_entry() returned nonzero to prevent - * the system call from taking place. - * - * This rolls back the register state in @regs so it's as if the - * system call instruction was a no-op. The registers containing - * the system call number and arguments are as they were before the - * system call instruction. This may not be the same as what the - * register state looked like at system call entry tracing. - */ -static inline void -syscall_rollback(struct task_struct *task, struct pt_regs *regs) -{ - regs->uregs[0] = regs->orig_r0; -} - -/** - * syscall_get_error - check result of traced system call - * @task: task of interest, must be blocked - * @regs: task_pt_regs() of @task - * - * Returns 0 if the system call succeeded, or -ERRORCODE if it failed. - * - * It's only valid to call this when @task is stopped for tracing on exit - * from a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT. - */ -static inline long -syscall_get_error(struct task_struct *task, struct pt_regs *regs) -{ - unsigned long error = regs->uregs[0]; - return IS_ERR_VALUE(error) ? error : 0; -} - -/** - * syscall_get_return_value - get the return value of a traced system call - * @task: task of interest, must be blocked - * @regs: task_pt_regs() of @task - * - * Returns the return value of the successful system call. - * This value is meaningless if syscall_get_error() returned nonzero. - * - * It's only valid to call this when @task is stopped for tracing on exit - * from a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT. - */ -static inline long -syscall_get_return_value(struct task_struct *task, struct pt_regs *regs) -{ - return regs->uregs[0]; -} - -/** - * syscall_set_return_value - change the return value of a traced system call - * @task: task of interest, must be blocked - * @regs: task_pt_regs() of @task - * @error: negative error code, or zero to indicate success - * @val: user return value if @error is zero - * - * This changes the results of the system call that user mode will see. - * If @error is zero, the user sees a successful system call with a - * return value of @val. If @error is nonzero, it's a negated errno - * code; the user sees a failed system call with this errno code. - * - * It's only valid to call this when @task is stopped for tracing on exit - * from a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT. - */ -static inline void -syscall_set_return_value(struct task_struct *task, struct pt_regs *regs, - int error, long val) -{ - regs->uregs[0] = (long)error ? error : val; -} - -/** - * syscall_get_arguments - extract system call parameter values - * @task: task of interest, must be blocked - * @regs: task_pt_regs() of @task - * @args: array filled with argument values - * - * Fetches 6 arguments to the system call (from 0 through 5). The first - * argument is stored in @args[0], and so on. - * - * It's only valid to call this when @task is stopped for tracing on - * entry to a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT. - */ -#define SYSCALL_MAX_ARGS 6 -static inline void -syscall_get_arguments(struct task_struct *task, struct pt_regs *regs, - unsigned long *args) -{ - args[0] = regs->orig_r0; - args++; - memcpy(args, ®s->uregs[0] + 1, 5 * sizeof(args[0])); -} - -static inline int -syscall_get_arch(struct task_struct *task) -{ - return IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) - ? AUDIT_ARCH_NDS32BE : AUDIT_ARCH_NDS32; -} - -#endif /* _ASM_NDS32_SYSCALL_H */ |