a99989af40
This patch moves the thread operations from the 'Cpu_session' to the 'Cpu_thread' interface. A noteworthy semantic change is the meaning of the former 'exception_handler' function, which used to define both, the default exception handler or a thread-specific signal handler. Now, the 'Cpu_session::exception_sigh' function defines the CPU-session-wide default handler whereas the 'Cpu_thread::exception_sigh' function defines the thread-specific one. To retain the ability to create 'Child' objects without invoking a capability, the child's initial thread must be created outside the 'Child::Process'. It is now represented by the 'Child::Initial_thread', which is passed as argument to the 'Child' constructor. Fixes #1939
117 lines
3.2 KiB
C++
117 lines
3.2 KiB
C++
/*
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* \brief Implementation of process creation for Linux
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* \author Norman Feske
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* \date 2006-07-06
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*/
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/*
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* Copyright (C) 2006-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/* Genode includes */
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#include <base/env.h>
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#include <base/child.h>
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#include <base/printf.h>
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#include <linux_native_pd/client.h>
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/* base-internal includes */
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#include <linux_syscalls.h>
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#include <base/internal/elf.h>
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using namespace Genode;
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/*
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* Register main thread at core
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*
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* At this point in time, we do not yet know the TID and PID of the new
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* thread. Those information will be provided to core by the constructor of
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* the 'Platform_env' of the new process.
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*/
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Child::Initial_thread::Initial_thread(Cpu_session &cpu,
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Pd_session_capability pd,
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Name const &name)
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:
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_cpu(cpu),
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_cap(cpu.create_thread(pd, name, Affinity::Location(), Cpu_session::Weight()))
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{ }
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Child::Initial_thread::~Initial_thread() { }
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void Child::Initial_thread::start(addr_t) { }
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/*
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* On Linux, the ELF loading is performed by the kernel
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*/
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Child::Process::Loaded_executable::Loaded_executable(Dataspace_capability,
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Dataspace_capability,
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Ram_session &,
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Region_map &,
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Region_map &,
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Parent_capability) { }
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Child::Process::Process(Dataspace_capability elf_ds,
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Dataspace_capability ldso_ds,
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Pd_session_capability pd_cap,
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Pd_session &pd,
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Ram_session &ram,
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Initial_thread_base &initial_thread,
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Region_map &local_rm,
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Region_map &remote_rm,
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Parent_capability parent_cap)
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:
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initial_thread(initial_thread),
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loaded_executable(elf_ds, ldso_ds, ram, local_rm, remote_rm, parent_cap)
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{
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/* skip loading when called during fork */
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if (!elf_ds.valid())
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return;
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/* attach ELF locally */
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addr_t elf_addr;
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try { elf_addr = local_rm.attach(elf_ds); }
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catch (Region_map::Attach_failed) {
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PERR("local attach of ELF executable failed"); throw; }
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/* setup ELF object and read program entry pointer */
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Elf_binary elf(elf_addr);
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if (!elf.valid())
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throw Invalid_executable();
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bool const dynamically_linked = elf.is_dynamically_linked();
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local_rm.detach(elf_addr);
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/*
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* If the specified executable is a dynamically linked program, we load
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* the dynamic linker instead.
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*/
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if (dynamically_linked) {
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if (!ldso_ds.valid()) {
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PERR("attempt to start dynamic executable without dynamic linker");
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throw Missing_dynamic_linker();
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}
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elf_ds = ldso_ds;
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}
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pd.assign_parent(parent_cap);
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Linux_native_pd_client
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lx_pd(static_cap_cast<Linux_native_pd>(pd.native_pd()));
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lx_pd.start(elf_ds);
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}
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Child::Process::~Process() { }
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