John Baldwin f39b4f8899 Work around lld's inability to handle undefined weak symbols on risc-v. ... lld on RISC-V is not yet able to handle undefined weak symbols for non-PIC code in the code model (medany/medium) used by the RISC-V kernel. Both GCC and clang emit an auipc / addi pair of instructions to generate an address relative to the current PC with a 31-bit offset. Undefined weak symbols need to have an address of 0, but the kernel runs with PC values much greater than 2^31, so there is no way to construct a NULL pointer as a PC-relative value. The bfd linker rewrites the instruction pair to use lui / addi with values of 0 to force a NULL pointer address. (There are similar cases for 'ld' becoming auipc / ld that bfd rewrites to lui / ld with an address of 0.) To work around this, compile the kernel with -fPIE when using lld. This does not make the kernel position-independent, but it does force the compiler to indirect address lookups through GOT entries (so auipc / ld against a GOT entry to fetch the address). This adds extra memory indirections for global symbols, so should be disabled once lld is finally fixed. A few 'la' instructions in locore that depend on PC-relative addressing to load physical addresses before paging is enabled have to use auipc / addi and not indirect via GOT entries, so change those to use 'lla' which always uses auipc / addi for both PIC and non-PIC. Submitted by: jrtc27 Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D23064		2020-01-07 23:18:31 +00:00
..
config.mk
dtb.build.mk	Introduce bsd.sysdir.mk to consolidate looking for the kernel.	2019-11-21 15:59:33 +00:00
dtb.mk
files	iicoc: limit fdt attachment to EXT_RESOURCES platforms	2020-01-02 23:00:52 +00:00
files.amd64	Remove sio(4).	2019-11-21 01:24:49 +00:00
files.arm	Compile in arm/unwind.c if options STACK is in effect; the new arm stack(9)	2019-11-14 17:04:19 +00:00
files.arm64	arm64: rockchip: Add driver for the io domain	2019-12-28 15:30:50 +00:00
files.i386	Remove sio(4).	2019-11-21 01:24:49 +00:00
files.mips	[PowerPC] [MIPS] Implement 32-bit kernel emulation of atomic64 operations	2020-01-02 23:20:37 +00:00
files.powerpc	[PowerPC] [MIPS] Implement 32-bit kernel emulation of atomic64 operations	2020-01-02 23:20:37 +00:00
files.riscv	RISC-V: add support for SBI spec v0.2	2019-11-15 03:34:27 +00:00
files.sparc64	emulate illumos membar_producer with atomic_thread_fence_rel	2019-10-10 07:39:41 +00:00
files.x86	Move all the sys/dev/[a-j]* that are common to files.x86	2019-10-30 19:53:46 +00:00
kern.mk	gcc9: quiet Waddress-of-packed-member for kernel build	2019-12-21 02:43:37 +00:00
kern.opts.mk	Disable REPRODUCIBLE_BUILD for kernel builds.	2019-09-28 14:14:42 +00:00
kern.post.mk	Port the NetBSD KCSAN runtime to FreeBSD.	2019-11-21 11:22:08 +00:00
kern.pre.mk	Work around lld's inability to handle undefined weak symbols on risc-v.	2020-01-07 23:18:31 +00:00
kmod_syms_prefix.awk
kmod_syms.awk
kmod.mk	[PowerPC] Switch to PIC kernel modules on powerpc*	2019-12-27 04:07:51 +00:00
kmod.opts.mk	Add a kmod.opts.mk.	2019-11-21 18:14:26 +00:00
ldscript.amd64	Tighten mapping protections on preloaded files on amd64.	2019-10-18 14:05:13 +00:00
ldscript.arm	Eliminate the generated ldscript for arm and arm64, and strip $a/$d marker	2019-12-29 18:17:12 +00:00
ldscript.arm64	Eliminate the generated ldscript for arm and arm64, and strip $a/$d marker	2019-12-29 18:17:12 +00:00
ldscript.i386
ldscript.kmod.amd64	Add an ldscript for amd64 kernel modules.	2019-10-17 21:39:23 +00:00
ldscript.kmod.i386	Formalize the use of linker scripts for kernel modules.	2019-10-16 22:19:56 +00:00
ldscript.mips
ldscript.mips.cfe
ldscript.mips.mips64
ldscript.mips.octeon1
ldscript.powerpc	powerpc: Kernel fixes for ppc32 and powerpcspe w/ lld	2019-11-14 04:34:17 +00:00
ldscript.powerpc64
ldscript.powerpcspe	powerpc: Kernel fixes for ppc32 and powerpcspe w/ lld	2019-11-14 04:34:17 +00:00
ldscript.riscv	riscv: Ensure that BSS is 8-byte aligned	2019-09-09 15:57:24 +00:00
ldscript.sparc64
Makefile.amd64
Makefile.arm	Set a "kernbase" symbol in 32-bit arm locore.S and use it with ldscript.arm.	2019-12-30 23:20:46 +00:00
Makefile.arm64	Eliminate the generated ldscript for arm and arm64, and strip $a/$d marker	2019-12-29 18:17:12 +00:00
Makefile.i386
Makefile.mips	Update MIPS kernel builds to work with mips-gcc.	2019-10-15 17:11:42 +00:00
Makefile.powerpc	[PowerPC] Clang powerpcspe build fixes	2019-12-27 05:01:13 +00:00
Makefile.riscv	Revert r356077, apparently the change doesn't work after all (failed to	2019-12-25 18:24:38 +00:00
Makefile.sparc64
makeLINT.mk	stop building arm LINT-V5 kernel	2019-11-26 20:46:20 +00:00
makeLINT.sed
newvers.sh
NOTES	Add support for i2c bus mux hardware.	2020-01-02 17:51:49 +00:00
options	UMA NUMA flag day. UMA_ZONE_NUMA was a source of confusion. Make the names	2020-01-04 18:48:13 +00:00
options.amd64
options.arm	arm: add SOC_BRCM_BCM2837 option, include it in GENERIC	2019-12-17 23:01:37 +00:00
options.arm64	Add support for booting kernel directly from U-Boot using booti command.	2019-12-07 16:14:23 +00:00
options.i386
options.mips
options.powerpc	powerpc: Add AmigaOne platform, a subclass of MPC85xx	2019-10-16 00:38:50 +00:00
options.riscv
options.sparc64
systags.sh
WITHOUT_SOURCELESS
WITHOUT_SOURCELESS_HOST
WITHOUT_SOURCELESS_UCODE