58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
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/*
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* Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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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 "kern_constants.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 = (struct stub_data *) STUB_DATA;
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long err;
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err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
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STUB_DATA + UM_KERN_PAGE_SIZE / 2 - sizeof(void *));
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if (err != 0)
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goto out;
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err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0);
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if (err)
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goto out;
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err = stub_syscall3(__NR_setitimer, ITIMER_VIRTUAL,
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(long) &data->timer, 0);
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if (err)
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goto out;
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remap_stack(data->fd, data->offset);
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goto done;
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out:
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/*
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* save current result.
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* Parent: pid;
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* child: retcode of mmap already saved and it jumps around this
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* assignment
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*/
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data->err = err;
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done:
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trap_myself();
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}
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