48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
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* Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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*/
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#include <signal.h>
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#include <sched.h>
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#include <asm/unistd.h>
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#include <sys/time.h>
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#include <as-layout.h>
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#include <ptrace_user.h>
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#include <stub-data.h>
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#include <sysdep/stub.h>
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/*
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* This is in a separate file because it needs to be compiled with any
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* extraneous gcc flags (-pg, -fprofile-arcs, -ftest-coverage) disabled
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*
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* Use UM_KERN_PAGE_SIZE instead of PAGE_SIZE because that calls getpagesize
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* on some systems.
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*/
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void __attribute__ ((__section__ (".__syscall_stub")))
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stub_clone_handler(void)
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{
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struct stub_data *data = get_stub_page();
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long err;
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err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
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(unsigned long)data + UM_KERN_PAGE_SIZE / 2);
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if (err) {
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data->parent_err = err;
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goto done;
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}
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err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0);
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if (err) {
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data->child_err = err;
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goto done;
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}
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remap_stack_and_trap();
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done:
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trap_myself();
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}
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