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50 lines
1.4 KiB
50 lines
1.4 KiB
// 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_syscalls) |
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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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