diff options
Diffstat (limited to 'Makeconfig')
| -rw-r--r-- | Makeconfig | 38 |
1 files changed, 34 insertions, 4 deletions
@@ -352,6 +352,14 @@ ifndef static-start-installed-name static-start-installed-name = $(start-installed-name) endif +ifeq (yes,$(enable-static-pie)) +# Link with rcrt1.o, instead of crt1.o, to call _dl_relocate_static_pie +# to relocate static PIE. +real-static-start-installed-name = r$(static-start-installed-name) +else +real-static-start-installed-name = $(static-start-installed-name) +endif + ifeq (yesyes,$(build-shared)$(have-z-combreloc)) combreloc-LDFLAGS = -Wl,-z,combreloc LDFLAGS.so += $(combreloc-LDFLAGS) @@ -371,6 +379,20 @@ LDFLAGS.so += $(hashstyle-LDFLAGS) LDFLAGS-rtld += $(hashstyle-LDFLAGS) endif +ifeq (yes,$(enable-static-pie)) +pic-default = -DPIC +# Compile libc.a and libc_p.a with -fPIE/-fpie for static PIE. +pie-default = $(pie-ccflag) +ifeq (yes,$(have-static-pie)) +default-pie-ldflag = -static-pie +else +# Static PIE can't have dynamic relocations in read-only segments since +# static PIE is mapped into memory by kernel. --eh-frame-hdr is needed +# for PIE to support exception. +default-pie-ldflag = -Wl,-pie,--no-dynamic-linker,--eh-frame-hdr,-z,text +endif +endif + # If lazy relocations are disabled, add the -z now flag. Use # LDFLAGS-lib.so instead of LDFLAGS.so, to avoid adding the flag to # test modules. @@ -420,9 +442,9 @@ endif # Command for statically linking programs with the C library. ifndef +link-static +link-static-before-libc = $(CC) -nostdlib -nostartfiles -static -o $@ \ - $(DEFAULT-LDFLAGS-$(@F)) \ + $(if $($(@F)-no-pie),$(no-pie-ldflag),$(default-pie-ldflag)) \ $(sysdep-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F)) \ - $(firstword $(CRT-$(@F)) $(csu-objpfx)$(static-start-installed-name)) \ + $(firstword $(CRT-$(@F)) $(csu-objpfx)$(real-static-start-installed-name)) \ $(+preinit) $(+prectorT) \ $(filter-out $(addprefix $(csu-objpfx),start.o \ $(start-installed-name))\ @@ -637,8 +659,14 @@ endif +prectorS = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtbeginS.o` +postctorS = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtendS.o` # Variants of the two previous definitions for statically linking programs. +ifeq (yes,$(enable-static-pie)) +# Static PIE must use PIE variants. ++prectorT = $(+prectorS) ++postctorT = $(+postctorS) +else +prectorT = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtbeginT.o` +postctorT = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtend.o` +endif csu-objpfx = $(common-objpfx)csu/ elf-objpfx = $(common-objpfx)elf/ @@ -959,7 +987,8 @@ libtypes = $(foreach o,$(object-suffixes-for-libc),$(libtype$o)) all-object-suffixes := .o .os .oS object-suffixes := CPPFLAGS-.o = $(pic-default) -CFLAGS-.o = $(filter %frame-pointer,$(+cflags)) +# libc.a must be compiled with -fPIE/-fpie for static PIE. +CFLAGS-.o = $(filter %frame-pointer,$(+cflags)) $(pie-default) libtype.o := lib%.a object-suffixes += .o ifeq (yes,$(build-shared)) @@ -984,7 +1013,8 @@ ifeq (yes,$(build-profile)) all-object-suffixes += .op object-suffixes += .op CPPFLAGS-.op = -DPROF $(pic-default) -CFLAGS-.op = -pg +# libc_p.a must be compiled with -fPIE/-fpie for static PIE. +CFLAGS-.op = -pg $(pie-default) libtype.op = lib%_p.a endif |