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The vDSO (virtual dynamic shared object) is a small shared library that the kernel maps R/O into the address space of all Linux processes on image activation. The vDSO is a fully formed ELF image, shared by all processes with the same ABI, has no process private data. The primary purpose of the vDSO: - non-executable stack, signal trampolines not copied to the stack; - signal trampolines unwind, mandatory for the NPTL; - to avoid contex-switch overhead frequently used system calls can be implemented in the vDSO: for now gettimeofday, clock_gettime. The first two have been implemented, so add the implementation of system calls. System calls implemenation based on a native timekeeping code with some limitations: - ifunc can't be used, as vDSO r/o mapped to the process VA and rtld can't relocate symbols; - reading HPET memory is not implemented for now (TODO). In case on any error vDSO system calls fallback to the kernel system calls. For unimplemented vDSO system calls added prototypes which call corresponding kernel system call. Tested by: trasz (arm64) Differential revision: https://reviews.freebsd.org/D30900 MFC after: 2 weeks
88 lines
3 KiB
Makefile
88 lines
3 KiB
Makefile
# $FreeBSD$
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.PATH: ${SRCTOP}/sys/compat/linux ${SRCTOP}/sys/${MACHINE}/linux
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.if ${MACHINE_CPUARCH} == "amd64"
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.PATH: ${SRCTOP}/sys/x86/linux
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.endif
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KMOD= linux64
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SRCS= linux_elf64.c linux_fork.c linux_dummy_machdep.c linux_file.c \
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linux_event.c linux_futex.c linux_getcwd.c linux_ioctl.c linux_ipc.c \
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linux_machdep.c linux_misc.c linux_ptrace.c linux_signal.c \
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linux_socket.c linux_stats.c linux_sysctl.c linux_sysent.c \
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linux_sysvec.c linux_time.c linux_vdso.c linux_timer.c \
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opt_compat.h opt_inet6.h opt_posix.h opt_usb.h \
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vnode_if.h device_if.h bus_if.h \
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linux_support.s
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.if ${MACHINE_CPUARCH} == "amd64"
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SRCS+= linux_dummy_x86.c linux_vdso_tsc_selector_x86.c
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.endif
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DPSRCS= assym.inc linux_genassym.c
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# XXX: for assym.inc
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SRCS+= opt_kstack_pages.h opt_nfs.h opt_hwpmc_hooks.h
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CLEANFILES= linux_assym.h linux_genassym.o linux_locore.o \
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genassym.o linux_vdso_gtod.o linux_vdso.so.o
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OBJS= linux_vdso.so
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linux_assym.h: linux_genassym.o
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sh ${SYSDIR}/kern/genassym.sh linux_genassym.o > ${.TARGET}
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.if ${MACHINE_CPUARCH} == "amd64"
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VDSOFLAGS=-mregparm=0 -mcmodel=small -msoft-float
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VDSODEPS=linux_vdso_gettc_x86.inc
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.elif ${MACHINE_CPUARCH} == "aarch64"
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# The Linux uses tiny memory model, but our ld does not know about
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# some of relocation types which is generated by cc
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VDSOFLAGS=-mgeneral-regs-only -mcmodel=small -ffixed-x18
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.endif
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linux_locore.o: linux_assym.h assym.inc
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${CC} -c -x assembler-with-cpp -DLOCORE \
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-fPIC -pipe -O2 -Werror ${VDSOFLAGS} \
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-nostdinc -fasynchronous-unwind-tables \
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-fno-omit-frame-pointer -foptimize-sibling-calls \
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-fno-stack-protector -I. -I${SYSDIR} -I${SRCTOP}/include \
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${.IMPSRC} -o ${.TARGET}
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linux_vdso_gtod.o: linux_vdso_gtod.inc ${VDSODEPS}
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${CC} -c -fPIC -pipe -O2 -Werror ${VDSOFLAGS} \
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-nostdinc -fasynchronous-unwind-tables \
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-fno-omit-frame-pointer -foptimize-sibling-calls \
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-fno-stack-protector -I. -I${SYSDIR} -I${SRCTOP}/include \
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${.IMPSRC} -o ${.TARGET}
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linux_vdso.so.o: linux_locore.o linux_vdso_gtod.o
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${LD} --shared --eh-frame-hdr -soname=linux-vdso.so.1 \
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--no-undefined --hash-style=both -warn-common -nostdlib \
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--strip-debug -s --build-id=sha1 -Bsymbolic \
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-T${SRCTOP}/sys/${MACHINE}/linux/linux_vdso.lds.s \
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-o ${.TARGET} ${.ALLSRC:M*.o}
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.if ${MACHINE_CPUARCH} == "aarch64"
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OBJCOPY_TARGET=--output-target elf64-littleaarch64 --binary-architecture aarch64
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.elif ${MACHINE_CPUARCH} == "amd64"
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OBJCOPY_TARGET=--output-target elf64-x86-64 --binary-architecture i386:x86-64
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.else
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.error ${MACHINE_CPUARCH} not yet supported by linux64
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.endif
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linux_vdso.so: linux_vdso.so.o
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${OBJCOPY} --input-target binary ${OBJCOPY_TARGET} \
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linux_vdso.so.o ${.TARGET}
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${STRIPBIN} -N _binary_linux_vdso_so_o_size ${.TARGET}
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linux_support.o: assym.inc linux_assym.h
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${CC} -c -x assembler-with-cpp -DLOCORE ${CFLAGS} \
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${.IMPSRC} -o ${.TARGET}
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linux_genassym.o: offset.inc
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${CC} -c ${CFLAGS:N-flto:N-fno-common} -fcommon ${.IMPSRC}
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.if !defined(KERNBUILDDIR)
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.warning Building Linuxulator outside of a kernel does not make sense
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.endif
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.include <bsd.kmod.mk>
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