denshooter/genode
1
0
Fork 0
mirror of https://github.com/mmueller41/genode.git synced 2026-01-21 12:32:56 +01:00
Code Issues Packages Projects Releases Wiki Activity

Simpify startup of dynamically linked binaries

Browse Source 
This patch removes the component_entry_point library, which used to
proved a hook for the libc to intercept the call of the
'Component::construct' function. The mechansim has several shortcomings
(see the discussion in the associated issue) and was complex. So we
eventually discarded the approach in favor of the explicit handling of
the startup.

A regular Genode component provides a 'Component::construct' function,
which is determined by the dynamic linker via a symbol lookup.
For the time being, the dynamic linker falls back to looking up a 'main'
function if no 'Component::construct' function could be found.

The libc provides an implementation of 'Component::construct', which
sets up the libc's task handling and finally call the function
'Libc::Component::construct' from the context of the appllication task.
This function is expected to be provided by the libc-using application.
Consequently, Genode components that use the libc have to implement the
'Libc::Component::construct' function.

The new 'posix' library provides an implementation of
'Libc::Component::construct' that calls a main function. Hence, POSIX
programs that merely use the POSIX API merely have to add 'posix' to the
'LIBS' declaration in their 'target.mk' file. Their execution starts at
'main'.

Issue #2199
This commit is contained in:
Norman Feske
2016-12-22 15:01:19 +01:00
parent 8d521036fb
commit 4da52517c1
112 changed files with 366 additions and 369 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
repos/base/mk/prg.mk
View File

@@ -110,14 +110,8 @@ LD_CMD ?= $(CXX)
LD_CMD += $(CXX_LINK_OPT)
ifeq ($(SHARED_LIBS),)
FILTER_DEPS := $(DEPS:.lib=)
LD_SCRIPTS := $(LD_SCRIPT_STATIC)
#
# Filter out the component-entry-point library since its not used for static
# binaries
#
FILTER_DEPS := $(filter-out component_entry_point,$(DEPS:.lib=))
else
#
@@ -135,13 +129,6 @@ LD_CMD += -Wl,--dynamic-linker=$(DYNAMIC_LINKER).lib.so \
FILTER_DEPS := $(filter-out $(BASE_LIBS),$(DEPS:.lib=))
SHARED_LIBS += $(LIB_CACHE_DIR)/$(DYNAMIC_LINKER)/$(DYNAMIC_LINKER).lib.so
#
# Link all dynamic executables to the component entry-point library (a
# trampoline for component startup from ldso)
#
FILTER_DEPS += component_entry_point
#
# Build program position independent as well
#