WiP! rom-names patch
This commit is contained in:
parent
ecf6f909a9
commit
d7959b453b
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@ -30,7 +30,7 @@ let
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version = upstreamSources.lastModifiedDate;
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src = upstreamSources;
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nativeBuildInputs = [ expect gnumake tcl ];
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patches = [ ./binary-labels.patch ];
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patches = [ ./binary-labels.patch ./rom-names.patch ];
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configurePhase = ''
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patchShebangs ./tool
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substituteInPlace repos/base/etc/tools.conf \
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@ -85,3 +85,28 @@ index 150640ddf3..e511897600 100644
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DUMMY(int , -1, getpriority, (int, int))
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DUMMY(int , -1, getrusage, (int, rusage *))
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DUMMY_SILENT(uid_t , 0, getuid, (void))
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commit d64e4b926c1dec39569efee89567f0575770bbd6
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Author: Emery Hemingway <ehmry@posteo.net>
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Date: Sun Nov 1 23:18:05 2020 +0100
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libc: do not strip file paths in dlopen
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Request files by verbatim path rather than shorten them to just a
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filename. This is to ensure that libraries with the "/nix/store/..."
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prefix are resolved correctly.
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diff --git a/repos/libports/src/lib/libc/dynamic_linker.cc b/repos/libports/src/lib/libc/dynamic_linker.cc
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index ba47856bed..b7aff1b869 100644
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--- a/repos/libports/src/lib/libc/dynamic_linker.cc
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+++ b/repos/libports/src/lib/libc/dynamic_linker.cc
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@@ -78,9 +78,7 @@ void *dlopen(const char *name, int mode)
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static Libc::Allocator global_alloc;
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return new (global_alloc)
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- Shared_object(*genode_env, global_alloc,
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- name ? Genode::Path<128>(name).last_element() : nullptr, /* extract file name */
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- bind, keep);
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+ Shared_object(*genode_env, global_alloc, name, bind, keep);
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} catch (...) {
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snprintf(err_str, MAX_ERR, "Unable to open file %s\n", name);
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}
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540
packages/genodelabs/rom-names.patch
Normal file
540
packages/genodelabs/rom-names.patch
Normal file
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@ -0,0 +1,540 @@
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commit adba5891acc724320c61743a6ec8694d2dc92d99
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Author: Emery Hemingway <ehmry@posteo.net>
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Date: Sun Nov 1 23:14:11 2020 +0100
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Pass explicit ROM name in session requests
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When name of a ROM in a session request is passed only as the last
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element of the request label then it can be destroyed if the label
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exceedes the size of the Genode::Session_label string type. This can
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happen if the initial ROM name is too large or after a sufficient number
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of prefixes are prepended to the label.
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diff --git a/repos/base-linux/src/core/spec/linux/dataspace_component.cc b/repos/base-linux/src/core/spec/linux/dataspace_component.cc
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index ad5c5c2929..45ce45333c 100644
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--- a/repos/base-linux/src/core/spec/linux/dataspace_component.cc
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+++ b/repos/base-linux/src/core/spec/linux/dataspace_component.cc
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@@ -34,15 +34,15 @@ using namespace Genode;
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Linux_dataspace::Filename Dataspace_component::_file_name(const char *args)
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{
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- Session_label const label = label_from_args(args);
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+ auto name = rom_name_from_args(args);
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Linux_dataspace::Filename fname;
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- if (label.last_element().length() > sizeof(fname.buf)) {
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- Genode::error("file name too long: ", label.last_element());
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+ if (name.length() > sizeof(fname.buf)) {
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+ Genode::error("file name too long: ", name);
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throw Service_denied();
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}
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- copy_cstring(fname.buf, label.last_element().string(), sizeof(fname.buf));
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+ copy_cstring(fname.buf, name.string(), sizeof(fname.buf));
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/* only files inside the current working directory are allowed */
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for (const char *c = fname.buf; *c; ++c)
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diff --git a/repos/base-linux/src/core/spec/pc/dataspace_component.cc b/repos/base-linux/src/core/spec/pc/dataspace_component.cc
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index d84132a596..a29b8da555 100644
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--- a/repos/base-linux/src/core/spec/pc/dataspace_component.cc
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+++ b/repos/base-linux/src/core/spec/pc/dataspace_component.cc
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@@ -33,15 +33,15 @@ using namespace Genode;
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Linux_dataspace::Filename Dataspace_component::_file_name(const char *args)
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{
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- Session_label const label = label_from_args(args);
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+ auto name = rom_name_from_args(args);
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Linux_dataspace::Filename fname;
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- if (label.last_element().length() > sizeof(fname.buf)) {
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- Genode::error("file name too long: ", label.last_element());
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+ if (name.length() > sizeof(fname.buf)) {
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+ Genode::error("file name too long: ", name);
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throw Service_denied();
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}
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- copy_cstring(fname.buf, label.last_element().string(), sizeof(fname.buf));
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+ copy_cstring(fname.buf, name.string(), sizeof(fname.buf));
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/* only files inside the current working directory are allowed */
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for (const char *c = fname.buf; *c; ++c)
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diff --git a/repos/base/include/rom_session/connection.h b/repos/base/include/rom_session/connection.h
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index ce1b9badf4..c4590ac1ed 100644
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--- a/repos/base/include/rom_session/connection.h
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+++ b/repos/base/include/rom_session/connection.h
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@@ -39,8 +39,10 @@ struct Genode::Rom_connection : Connection<Rom_session>,
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try :
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Connection<Rom_session>(env,
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session(env.parent(),
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- "ram_quota=%ld, cap_quota=%ld, label=\"%s\"",
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- RAM_QUOTA, CAP_QUOTA, label)),
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+ "ram_quota=%ld, cap_quota=%ld, "
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+ "name=\"%s\", label=\"%s\"",
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+ RAM_QUOTA, CAP_QUOTA,
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+ label, label)),
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Rom_session_client(cap())
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{ }
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catch (...) {
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diff --git a/repos/base/include/rom_session/rpc_object.h b/repos/base/include/rom_session/rpc_object.h
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new file mode 100644
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index 0000000000..dc9676c3a3
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--- /dev/null
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+++ b/repos/base/include/rom_session/rpc_object.h
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@@ -0,0 +1,48 @@
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+/*
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+ * \brief Server-side ROM session object
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+ * \author Emery Hemingway
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+ * \date 2020-11-01
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+ */
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+
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+/*
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+ * Copyright (C) 2020 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 Affero General Public License version 3.
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+ */
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+
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+#ifndef _INCLUDE__ROM_SESSION__RPC_OBJECT_H_
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+#define _INCLUDE__ROM_SESSION__RPC_OBJECT_H_
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+
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+#include <rom_session/rom_session.h>
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+#include <base/log.h>
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+#include <base/rpc_server.h>
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+#include <util/arg_string.h>
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+
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+namespace Genode {
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+
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+ typedef Rpc_object<Rom_session> Rom_rpc_object;
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+
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+ /**
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+ * Extract ROM name from session arguments
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+ */
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+ inline Session_label rom_name_from_args(char const *args)
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+ {
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+ char buf[Session_label::capacity()];
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+
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+ Arg_string::find_arg(args, "name").string(buf, sizeof(buf), "");
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+ Session_label const name{Cstring(buf)};
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+
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+ Arg_string::find_arg(args, "label").string(buf, sizeof(buf), "");
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+ Session_label const label{Cstring(buf)};
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+ Session_label const label_last = label.last_element();
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+
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+ if (name == "") return label_last;
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+ if (name != label_last)
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+ warning("ROM name mangled to \"", label, "\" from \"", name, "\"");
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+ return name;
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+ }
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+
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+}
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+
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+#endif /* _INCLUDE__ROM_SESSION__RPC_OBJECT_H_ */
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diff --git a/repos/base/src/core/include/rom_session_component.h b/repos/base/src/core/include/rom_session_component.h
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index c584701f5f..1a9e4e5bd3 100644
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--- a/repos/base/src/core/include/rom_session_component.h
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+++ b/repos/base/src/core/include/rom_session_component.h
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@@ -17,12 +17,12 @@
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#include <rom_fs.h>
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#include <base/rpc_server.h>
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#include <dataspace_component.h>
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-#include <rom_session/rom_session.h>
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+#include <rom_session/rpc_object.h>
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#include <base/session_label.h>
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namespace Genode {
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- class Rom_session_component : public Rpc_object<Rom_session>
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+ class Rom_session_component : public Rom_rpc_object
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{
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private:
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@@ -33,11 +33,11 @@ namespace Genode {
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Rom_module const &_find_rom(Rom_fs &rom_fs, const char *args)
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{
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- /* extract label */
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- Session_label const label = label_from_args(args);
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+ /* extract name of ROM */
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+ auto name = rom_name_from_args(args);
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- /* find ROM module for trailing label element */
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- Rom_module const * rom = rom_fs.find(label.last_element().string());
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+ /* find ROM module */
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+ Rom_module const * rom = rom_fs.find(name.string());
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if (rom)
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return *rom;
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diff --git a/repos/os/include/init/child_policy.h b/repos/os/include/init/child_policy.h
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index 544b0730c9..d614fddce1 100644
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--- a/repos/os/include/init/child_policy.h
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+++ b/repos/os/include/init/child_policy.h
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@@ -19,7 +19,7 @@
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/* Genode includes */
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#include <base/rpc_server.h>
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#include <base/service.h>
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-#include <rom_session/rom_session.h>
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+#include <rom_session/rpc_object.h>
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namespace Init {
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class Child_policy_provide_rom_file;
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@@ -79,15 +79,17 @@ class Init::Child_policy_provide_rom_file
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Service *resolve_session_request_with_label(Service::Name const &name,
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Session_label const &label)
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{
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- return (name == "ROM" && label.last_element() == _module_name)
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+ return (name == Rom_session::service_name()
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+ && label.last_element() == _module_name)
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? &_service : nullptr;
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}
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Service *resolve_session_request(const char *service_name,
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const char *args)
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{
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- return resolve_session_request_with_label(service_name,
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- label_from_args(args));
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+ return (service_name == Rom_session::service_name()
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+ && rom_name_from_args(args) == _module_name)
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+ ? &_service : nullptr;
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}
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};
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diff --git a/repos/os/src/lib/sandbox/child.cc b/repos/os/src/lib/sandbox/child.cc
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index e321df61fd..cd7a971abb 100644
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--- a/repos/os/src/lib/sandbox/child.cc
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+++ b/repos/os/src/lib/sandbox/child.cc
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@@ -11,6 +11,7 @@
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* under the terms of the GNU Affero General Public License version 3.
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*/
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+#include <rom_session/rpc_object.h>
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#include <vm_session/vm_session.h>
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/* local includes */
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@@ -463,23 +464,6 @@ Sandbox::Child::resolve_session_request(Service::Name const &service_name,
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*/
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}
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- /*
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- * Check for the binary's ROM request
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- *
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- * The binary is requested as a ROM with the child's unique
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- * name ('Child_policy::binary_name' equals 'Child_policy::name').
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- * If the binary name differs from the child's unique name,
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- * we resolve the session request with the binary name as label.
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- * Otherwise the regular routing is applied.
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- */
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- if (service_name == Rom_session::service_name() &&
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- label == _unique_name && _unique_name != _binary_name)
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- return resolve_session_request(service_name, _binary_name);
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-
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- /* supply binary as dynamic linker if '<start ld="no">' */
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- if (!_use_ld && service_name == Rom_session::service_name() && label == "ld.lib.so")
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- return resolve_session_request(service_name, _binary_name);
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-
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/* check for "session_requests" ROM request */
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if (service_name == Rom_session::service_name()
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&& label.last_element() == Session_requester::rom_name())
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@@ -641,6 +625,31 @@ void Sandbox::Child::filter_session_args(Service::Name const &service,
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Arg_string::remove_arg(args, "managing_system");
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}
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}
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+
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+ if (service == Rom_session::service_name()) {
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+ auto rom_name = rom_name_from_args(args);
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+
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+ /*
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+ * Check for the binary's ROM request
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+ *
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+ * The binary is requested as a ROM with the child's unique
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+ * name ('Child_policy::binary_name' equals 'Child_policy::name').
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+ * If the binary name differs from the child's unique name,
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+ * we resolve the session request with the binary name as label.
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+ * Otherwise the regular routing is applied.
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+ */
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+ if (rom_name == _unique_name && _unique_name != _binary_name)
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+ Arg_string::set_arg(args, args_len, "name", _binary_name.string());
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+
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+ /* supply binary as dynamic linker if '<start ld="no">' */
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+ else if (!_use_ld && rom_name == "ld.lib.so")
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+ Arg_string::set_arg(args, args_len, "name", _binary_name.string());
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+
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+ /* set the ROM name before something breaks */
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+ else if (rom_name == "")
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+ Arg_string::set_arg(args, args_len, "name",
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+ rom_name_from_args(args).last_element().string());
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+ }
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}
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diff --git a/repos/os/src/server/cached_fs_rom/main.cc b/repos/os/src/server/cached_fs_rom/main.cc
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index 9e4e4d0eee..8dfcb58d1e 100755
|
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--- a/repos/os/src/server/cached_fs_rom/main.cc
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+++ b/repos/os/src/server/cached_fs_rom/main.cc
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@@ -15,7 +15,7 @@
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#include <os/path.h>
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#include <file_system_session/connection.h>
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#include <file_system/util.h>
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-#include <rom_session/rom_session.h>
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+#include <rom_session/rpc_object.h>
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#include <region_map/client.h>
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#include <rm_session/connection.h>
|
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#include <base/attached_ram_dataspace.h>
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@@ -233,24 +233,21 @@ struct Cached_fs_rom::Transfer final
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};
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|
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-class Cached_fs_rom::Session_component final : public Rpc_object<Rom_session>
|
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+class Cached_fs_rom::Session_component final : public Rom_rpc_object
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{
|
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private:
|
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|
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Cached_rom &_cached_rom;
|
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Cached_rom::Guard _cache_guard { _cached_rom };
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Session_space::Element _sessions_elem;
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- Session_label const _label;
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public:
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Session_component(Cached_rom &cached_rom,
|
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- Session_space &space, Session_space::Id id,
|
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- Session_label const &label)
|
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+ Session_space &space, Session_space::Id id)
|
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:
|
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_cached_rom(cached_rom),
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- _sessions_elem(*this, space, id),
|
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- _label(label)
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+ _sessions_elem(*this, space, id)
|
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{ }
|
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@@ -366,8 +363,9 @@ struct Cached_fs_rom::Main final : Genode::Session_request_handler
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|
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Session_space::Id const id { pid.value };
|
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- Session_label const label = label_from_args(args.string());
|
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- Path const path(label.last_element().string());
|
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+ auto const label = label_from_args(args.string());
|
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+ auto const rom_name = rom_name_from_args(args.string());
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+ Path const path(rom_name.string());
|
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|
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Cached_rom *rom = nullptr;
|
||||
|
||||
@@ -393,7 +391,7 @@ struct Cached_fs_rom::Main final : Genode::Session_request_handler
|
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if (rom->completed()) {
|
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/* Create new RPC object */
|
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Session_component *session = new (heap)
|
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- Session_component(*rom, sessions, id, label);
|
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+ Session_component(*rom, sessions, id);
|
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if (session_diag_from_args(args.string()).enabled)
|
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log("deliver ROM \"", label, "\"");
|
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env.parent().deliver_session_cap(pid, env.ep().manage(*session));
|
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diff --git a/repos/os/src/server/dynamic_rom/main.cc b/repos/os/src/server/dynamic_rom/main.cc
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index 95d4175dab..efcc92b3f1 100644
|
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--- a/repos/os/src/server/dynamic_rom/main.cc
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+++ b/repos/os/src/server/dynamic_rom/main.cc
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@@ -20,7 +20,7 @@
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#include <base/log.h>
|
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#include <base/attached_rom_dataspace.h>
|
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#include <base/attached_ram_dataspace.h>
|
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-#include <rom_session/rom_session.h>
|
||||
+#include <rom_session/rpc_object.h>
|
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#include <timer_session/connection.h>
|
||||
#include <root/component.h>
|
||||
|
||||
@@ -221,7 +221,7 @@ class Dynamic_rom::Root : public Genode::Root_component<Session_component>
|
||||
|
||||
/* read name of ROM module from args */
|
||||
Session_label const label = label_from_args(args);
|
||||
- Session_label const module_name = label.last_element();
|
||||
+ Session_label const module_name = rom_name_from_args(args);
|
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|
||||
try {
|
||||
return new (md_alloc())
|
||||
diff --git a/repos/os/src/server/fs_rom/main.cc b/repos/os/src/server/fs_rom/main.cc
|
||||
index 2221af0363..4fbd54f3f5 100755
|
||||
--- a/repos/os/src/server/fs_rom/main.cc
|
||||
+++ b/repos/os/src/server/fs_rom/main.cc
|
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@@ -13,7 +13,7 @@
|
||||
*/
|
||||
|
||||
/* Genode includes */
|
||||
-#include <rom_session/rom_session.h>
|
||||
+#include <rom_session/rpc_object.h>
|
||||
#include <file_system_session/connection.h>
|
||||
#include <file_system/util.h>
|
||||
#include <os/path.h>
|
||||
@@ -44,7 +44,7 @@ namespace Fs_rom {
|
||||
/**
|
||||
* A 'Rom_session_component' exports a single file of the file system
|
||||
*/
|
||||
-class Fs_rom::Rom_session_component : public Rpc_object<Rom_session>
|
||||
+class Fs_rom::Rom_session_component : public Rom_rpc_object
|
||||
{
|
||||
private:
|
||||
|
||||
@@ -519,8 +519,7 @@ class Fs_rom::Rom_root : public Root_component<Fs_rom::Rom_session_component>
|
||||
|
||||
Rom_session_component *_create_session(const char *args) override
|
||||
{
|
||||
- Session_label const label = label_from_args(args);
|
||||
- Session_label const module_name = label.last_element();
|
||||
+ auto module_name = rom_name_from_args(args);
|
||||
|
||||
/* create new session for the requested file */
|
||||
return new (md_alloc())
|
||||
diff --git a/repos/os/src/server/iso9660/main.cc b/repos/os/src/server/iso9660/main.cc
|
||||
index fa41152716..a7f0e92558 100644
|
||||
--- a/repos/os/src/server/iso9660/main.cc
|
||||
+++ b/repos/os/src/server/iso9660/main.cc
|
||||
@@ -22,7 +22,7 @@
|
||||
#include <base/attached_ram_dataspace.h>
|
||||
#include <base/session_label.h>
|
||||
#include <block_session/connection.h>
|
||||
-#include <rom_session/rom_session.h>
|
||||
+#include <rom_session/rpc_object.h>
|
||||
|
||||
/* local includes */
|
||||
#include "iso9660.h"
|
||||
@@ -78,14 +78,14 @@ class Iso::File : public File_base
|
||||
{
|
||||
Iso::read_file(block, _info, 0, _ds.size(), _ds.local_addr<void>());
|
||||
}
|
||||
-
|
||||
+
|
||||
~File() { destroy(_alloc, _info); }
|
||||
|
||||
Dataspace_capability dataspace() { return _ds.cap(); }
|
||||
};
|
||||
|
||||
|
||||
-class Iso::Rom_component : public Genode::Rpc_object<Rom_session>
|
||||
+class Iso::Rom_component : public Genode::Rom_rpc_object
|
||||
{
|
||||
private:
|
||||
|
||||
@@ -156,8 +156,8 @@ class Iso::Root : public Iso::Root_component
|
||||
if (ram_quota < session_size)
|
||||
throw Insufficient_ram_quota();
|
||||
|
||||
- Session_label const label = label_from_args(args);
|
||||
- copy_cstring(_path, label.last_element().string(), sizeof(_path));
|
||||
+ Session_label const name = rom_name_from_args(args);
|
||||
+ copy_cstring(_path, name.string(), sizeof(_path));
|
||||
|
||||
if (verbose)
|
||||
Genode::log("Request for file ", Cstring(_path), " len ", strlen(_path));
|
||||
diff --git a/repos/os/src/server/loader/main.cc b/repos/os/src/server/loader/main.cc
|
||||
index d2f5240c6a..d72f3f13ee 100644
|
||||
--- a/repos/os/src/server/loader/main.cc
|
||||
+++ b/repos/os/src/server/loader/main.cc
|
||||
@@ -18,6 +18,7 @@
|
||||
#include <loader_session/loader_session.h>
|
||||
#include <root/component.h>
|
||||
#include <os/session_policy.h>
|
||||
+#include <rom_session/rpc_object.h>
|
||||
|
||||
/* local includes */
|
||||
#include <child.h>
|
||||
@@ -73,8 +74,7 @@ class Loader::Session_component : public Rpc_object<Session>
|
||||
try {
|
||||
Mutex::Guard guard(_mutex);
|
||||
|
||||
- Session_label const label = label_from_args(args.string());
|
||||
- Session_label const name = label.last_element();
|
||||
+ Session_label const name = rom_name_from_args(args.string());
|
||||
|
||||
Rom_module &module = _rom_modules.lookup_and_lock(name.string());
|
||||
|
||||
diff --git a/repos/os/src/server/rom_prefetcher/main.cc b/repos/os/src/server/rom_prefetcher/main.cc
|
||||
index 7f1552ff57..e3bd89fea1 100644
|
||||
--- a/repos/os/src/server/rom_prefetcher/main.cc
|
||||
+++ b/repos/os/src/server/rom_prefetcher/main.cc
|
||||
@@ -17,6 +17,7 @@
|
||||
#include <base/log.h>
|
||||
#include <base/heap.h>
|
||||
#include <base/attached_rom_dataspace.h>
|
||||
+#include <rom_session/rpc_object.h>
|
||||
#include <timer_session/connection.h>
|
||||
#include <base/session_label.h>
|
||||
|
||||
@@ -84,11 +85,11 @@ class Rom_prefetcher::Rom_root : public Genode::Root_component<Rom_session_compo
|
||||
|
||||
Rom_session_component *_create_session(const char *args) override
|
||||
{
|
||||
- Genode::Session_label const label = Genode::label_from_args(args);
|
||||
+ Genode::Session_label const name = Genode::rom_name_from_args(args);
|
||||
|
||||
/* create new session for the requested file */
|
||||
return new (md_alloc())
|
||||
- Rom_session_component(_env, label.last_element());
|
||||
+ Rom_session_component(_env, name);
|
||||
}
|
||||
|
||||
public:
|
||||
diff --git a/repos/os/src/server/tar_rom/main.cc b/repos/os/src/server/tar_rom/main.cc
|
||||
index 00fd032c00..7d372d89de 100755
|
||||
--- a/repos/os/src/server/tar_rom/main.cc
|
||||
+++ b/repos/os/src/server/tar_rom/main.cc
|
||||
@@ -13,6 +13,7 @@
|
||||
*/
|
||||
|
||||
/* Genode includes */
|
||||
+#include <rom_session/rpc_object.h>
|
||||
#include <base/component.h>
|
||||
#include <base/attached_rom_dataspace.h>
|
||||
#include <base/heap.h>
|
||||
@@ -32,7 +33,7 @@ namespace Tar_rom {
|
||||
/**
|
||||
* A 'Rom_session_component' exports a single file of the tar archive
|
||||
*/
|
||||
-class Tar_rom::Rom_session_component : public Rpc_object<Rom_session>
|
||||
+class Tar_rom::Rom_session_component : public Rom_rpc_object
|
||||
{
|
||||
private:
|
||||
|
||||
@@ -197,8 +198,7 @@ class Tar_rom::Rom_root : public Root_component<Rom_session_component>
|
||||
|
||||
Rom_session_component *_create_session(const char *args) override
|
||||
{
|
||||
- Session_label const label = label_from_args(args);
|
||||
- Session_label const module_name = label.last_element();
|
||||
+ Session_label const module_name = rom_name_from_args(args);
|
||||
log("connection for module '", module_name, "' requested");
|
||||
|
||||
/* create new session for the requested file */
|
||||
diff --git a/repos/ports/src/app/gdb_monitor/rom.h b/repos/ports/src/app/gdb_monitor/rom.h
|
||||
index d6163765b6..2b75bd5f51 100644
|
||||
--- a/repos/ports/src/app/gdb_monitor/rom.h
|
||||
+++ b/repos/ports/src/app/gdb_monitor/rom.h
|
||||
@@ -19,6 +19,7 @@
|
||||
#include <dataspace/client.h>
|
||||
#include <root/component.h>
|
||||
#include <rom_session/connection.h>
|
||||
+#include <rom_session/rpc_object.h>
|
||||
#include <util/arg_string.h>
|
||||
|
||||
|
||||
@@ -35,7 +36,7 @@ namespace Gdb_monitor
|
||||
/**
|
||||
* ROM session backed by RAM dataspace copy of original ROM
|
||||
*/
|
||||
-class Gdb_monitor::Rom_session_component : public Rpc_object<Rom_session>
|
||||
+class Gdb_monitor::Rom_session_component : public Rom_rpc_object
|
||||
{
|
||||
private:
|
||||
|
||||
@@ -120,12 +121,12 @@ class Gdb_monitor::Local_rom_factory : public Rom_service::Factory
|
||||
|
||||
Rom_session_component &create(Args const &args, Affinity) override
|
||||
{
|
||||
- Session_label const label = label_from_args(args.string());
|
||||
+ Session_label const name = rom_name_from_args(args.string());
|
||||
|
||||
return *new (_alloc)
|
||||
Rom_session_component(_env,
|
||||
_ep,
|
||||
- label.last_element().string());
|
||||
+ name.string());
|
||||
}
|
||||
|
||||
void upgrade(Rom_session_component &, Args const &) override { }
|
Loading…
Reference in New Issue
Block a user