// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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*/
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#include <linux/kernel.h>
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#include <linux/ptrace.h>
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#include <linux/seccomp.h>
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#include <kern_util.h>
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#include <sysdep/ptrace.h>
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#include <sysdep/ptrace_user.h>
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#include <sysdep/syscalls.h>
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#include <linux/time-internal.h>
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#include <asm/unistd.h>
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void handle_syscall(struct uml_pt_regs *r)
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{
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struct pt_regs *regs = container_of(r, struct pt_regs, regs);
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int syscall;
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/*
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* If we have infinite CPU resources, then make every syscall also a
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* preemption point, since we don't have any other preemption in this
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* case, and kernel threads would basically never run until userspace
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* went to sleep, even if said userspace interacts with the kernel in
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* various ways.
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*/
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if (time_travel_mode == TT_MODE_INFCPU ||
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time_travel_mode == TT_MODE_EXTERNAL)
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schedule();
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/* Initialize the syscall number and default return value. */
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UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->gp);
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PT_REGS_SET_SYSCALL_RETURN(regs, -ENOSYS);
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if (syscall_trace_enter(regs))
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goto out;
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/* Do the seccomp check after ptrace; failures should be fast. */
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if (secure_computing() == -1)
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goto out;
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syscall = UPT_SYSCALL_NR(r);
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if (syscall >= 0 && syscall <= __NR_syscall_max)
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PT_REGS_SET_SYSCALL_RETURN(regs,
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EXECUTE_SYSCALL(syscall, regs));
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out:
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syscall_trace_leave(regs);
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}
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