45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
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#include <sched.h>
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#include <signal.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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#include <asm/unistd.h>
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#include <asm/page.h>
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#include "ptrace_user.h"
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#include "skas.h"
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#include "stub-data.h"
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#include "uml-config.h"
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#include "sysdep/stub.h"
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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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void __attribute__ ((__section__ (".__syscall_stub")))
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stub_clone_handler(void)
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{
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long err;
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struct stub_data *from = (struct stub_data *) UML_CONFIG_STUB_DATA;
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err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD,
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UML_CONFIG_STUB_DATA + PAGE_SIZE / 2 -
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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) &from->timer, 0);
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if(err)
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goto out;
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err = stub_syscall6(STUB_MMAP_NR, UML_CONFIG_STUB_DATA, PAGE_SIZE,
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PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED,
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from->fd, from->offset);
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out:
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/* save current result. Parent: pid; child: retcode of mmap */
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from->err = err;
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trap_myself();
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}
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