ebb5e78cc6
Add an initial implementation of a proper (i.e. an ELF shared library) VDSO. With this commit it does not export any symbols, it only replaces the current signal return trampoline page. A later commit will add user implementations of gettimeofday()/clock_gettime(). To support both new toolchains and old ones which don't generate ABI flags section, we define its content manually and then use a tool (genvdso) to patch up the section to have the correct name and type. genvdso also extracts symbol offsets ({,rt_}sigreturn) needed by the kernel, and generates a C file containing a "struct mips_vdso_image" containing both the VDSO data and these offsets. This C file is compiled into the kernel. On 64-bit kernels we require a different VDSO for each supported ABI, so we may build up to 3 different VDSOs. The VDSO to use is selected by the mips_abi structure. A kernel/user shared data page is created and mapped below the VDSO image. This is currently empty, but will be used by the user time function implementations which are added later. [markos.chandras@imgtec.com: - Add more comments - Move abi detection in genvdso.h since it's the get_symbol function that needs it. - Add an R6 specific way to calculate the base address of VDSO in order to avoid the branch instruction which affects performance. - Do not patch .gnu.attributes since it's not needed for dynamic linking. - Simplify Makefile a little bit. - checkpatch fixes - Restrict VDSO support for binutils < 2.25 for pre-R6 - Include atomic64.h for O32 variant on MIPS64] Signed-off-by: Alex Smith <alex.smith@imgtec.com> Signed-off-by: Markos Chandras <markos.chandras@imgtec.com> Cc: Matthew Fortune <matthew.fortune@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/11337/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org> |
||
---|---|---|
.. | ||
auxvec.h | ||
bitfield.h | ||
bitsperlong.h | ||
break.h | ||
byteorder.h | ||
cachectl.h | ||
errno.h | ||
fcntl.h | ||
hwcap.h | ||
inst.h | ||
ioctl.h | ||
ioctls.h | ||
Kbuild | ||
kvm.h | ||
kvm_para.h | ||
mman.h | ||
msgbuf.h | ||
param.h | ||
poll.h | ||
posix_types.h | ||
ptrace.h | ||
reg.h | ||
resource.h | ||
sembuf.h | ||
setup.h | ||
sgidefs.h | ||
shmbuf.h | ||
sigcontext.h | ||
siginfo.h | ||
signal.h | ||
socket.h | ||
sockios.h | ||
stat.h | ||
statfs.h | ||
swab.h | ||
sysmips.h | ||
termbits.h | ||
termios.h | ||
types.h | ||
ucontext.h | ||
unistd.h |