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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.
Relnotes: yes
Tested by: trasz (arm64)
Differential revision: https://reviews.freebsd.org/D30900
MFC after: 2 weeks
(cherry picked from commit 9931033bbf)
90 lines
3 KiB
Makefile
90 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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EXPORT_SYMS= YES
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.include <bsd.kmod.mk>
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