linux-dev/arch/riscv/kernel/Makefile, branch master

kbuild: use obj-y instead extra-y for objects placed at the head

2022-10-02T09:04:05Z

The objects placed at the head of vmlinux need special treatments: - arch/$(SRCARCH)/Makefile adds them to head-y in order to place them before other archives in the linker command line. - arch/$(SRCARCH)/kernel/Makefile adds them to extra-y instead of obj-y to avoid them going into built-in.a. This commit gets rid of the latter. Create vmlinux.a to collect all the objects that are unconditionally linked to vmlinux. The objects listed in head-y are moved to the head of vmlinux.a by using 'ar m'. With this, arch/$(SRCARCH)/kernel/Makefile can consistently use obj-y for builtin objects. There is no *.o that is directly linked to vmlinux. Drop unneeded code in scripts/clang-tools/gen_compile_commands.py. $(AR) mPi needs 'T' to workaround the llvm-ar bug. The fix was suggested by Nathan Chancellor [1]. [1]: https://lore.kernel.org/llvm/YyjjT5gQ2hGMH0ni@dev-arch.thelio-3990X/ Signed-off-by: Masahiro Yamada Tested-by: Nick Desaulniers Reviewed-by: Nicolas Schier

RISC-V: kexec: Fix build error without CONFIG_KEXEC

2022-07-14T21:23:41Z

When CONFIG_KEXEC_FILE=y but CONFIG_KEXEC is not set: kernel/kexec_core.o: In function `kimage_free': kexec_core.c:(.text+0xa0c): undefined reference to `machine_kexec_cleanup' kernel/kexec_core.o: In function `.L0 ': kexec_core.c:(.text+0xde8): undefined reference to `machine_crash_shutdown' kexec_core.c:(.text+0xdf4): undefined reference to `machine_kexec' kernel/kexec_core.o: In function `.L231': kexec_core.c:(.text+0xe1c): undefined reference to `riscv_crash_save_regs' kernel/kexec_core.o: In function `.L0 ': kexec_core.c:(.text+0x119e): undefined reference to `machine_shutdown' kernel/kexec_core.o: In function `.L312': kexec_core.c:(.text+0x11b2): undefined reference to `machine_kexec' kernel/kexec_file.o: In function `.L0 ': kexec_file.c:(.text+0xb84): undefined reference to `machine_kexec_prepare' kernel/kexec_file.o: In function `.L177': kexec_file.c:(.text+0xc5a): undefined reference to `machine_kexec_prepare' Makefile:1160: recipe for target 'vmlinux' failed make: *** [vmlinux] Error 1 These symbols should depend on CONFIG_KEXEC_CORE rather than CONFIG_KEXEC when kexec_file has been implemented on RISC-V, like the other archs have done. Signed-off-by: Li Zhengyu Reviewed-by: Masahiro Yamada Acked-by: Randy Dunlap Tested-by: Randy Dunlap Link: https://lore.kernel.org/r/20220601070204.26882-1-lizhengyu3@huawei.com Fixes: 6261586e0c91 ("RISC-V: Add kexec_file support") Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt

riscv: kexec: add kexec_file_load() support

2022-05-19T23:26:50Z

This patch set implements kexec_file_load() for RISC-V, which is currently only allowed on rv64 due to some minor build issues on 32-bit platforms in the generic code. This allows users to kexec() using an FD as opposed to a buffer. Link: https://lore.kernel.org/all/20220408100914.150110-1-lizhengyu3@huawei.com/ * palmer/riscv-kexec_file: RISC-V: Load purgatory in kexec_file RISC-V: Add purgatory RISC-V: Support for kexec_file on panic RISC-V: Add kexec_file support RISC-V: use memcpy for kexec_file mode kexec_file: Fix kexec_file.c build error for riscv platform

RISC-V: Add kexec_file support

2022-05-19T19:14:18Z

This patch adds support for kexec_file on RISC-V. I tested it on riscv64 QEMU with busybear-linux and single core along with the OpenSBI firmware fw_jump.bin for generic platform. On SMP system, it depends on CONFIG_{HOTPLUG_CPU, RISCV_SBI} to resume/stop hart through OpenSBI firmware, it also needs a OpenSBI that support the HSM extension. Signed-off-by: Liao Chang Signed-off-by: Li Zhengyu Link: https://lore.kernel.org/r/20220408100914.150110-4-lizhengyu3@huawei.com [Palmer: Make 64-bit only] Signed-off-by: Palmer Dabbelt

RISC-V: Add support for rv32 userspace via COMPAT

2022-05-19T16:51:59Z

The RISC-V port supports the rv32i and rv64i base ISAs, but provides no mechanism to run 32-bit userspace on 64-bit systems. This adds that support, via the COMPAT framework. As the RISC-V ISAs (and uABIs) were developed concurrently, the resulting compat support is mostly generic. This includes a handful of cleanups to the generic compat infrastructure to more cleanly support RISC-V, followed by the RISC-V implementation. * palmer/riscv-compat: riscv: compat: Add COMPAT Kbuild skeletal support riscv: compat: ptrace: Add compat_arch_ptrace implement riscv: compat: signal: Add rt_frame implementation riscv: compat: vdso: Add setup additional pages implementation riscv: compat: vdso: Add COMPAT_VDSO base code implementation riscv: compat: Add hw capability check for elf riscv: compat: Add elf.h implementation riscv: compat: process: Add UXL_32 support in start_thread riscv: compat: syscall: Add entry.S implementation riscv: compat: syscall: Add compat_sys_call_table implementation riscv: compat: Support TASK_SIZE for compat mode riscv: compat: Add basic compat data type implementation riscv: Fixup difference with defconfig syscalls: compat: Fix the missing part for __SYSCALL_COMPAT asm-generic: compat: Cleanup duplicate definitions fs: stat: compat: Add __ARCH_WANT_COMPAT_STAT arch: Add SYSVIPC_COMPAT for all architectures compat: consolidate the compat_flock{,64} definition uapi: always define F_GETLK64/F_SETLK64/F_SETLKW64 in fcntl.h uapi: simplify __ARCH_FLOCK{,64}_PAD a little

riscv: compat: signal: Add rt_frame implementation

2022-05-17T23:37:21Z

Implement compat_setup_rt_frame for sigcontext save & restore. The main process is the same with signal, but the rv32 pt_regs' size is different from rv64's, so we needs convert them. Signed-off-by: Guo Ren Signed-off-by: Guo Ren Reviewed-by: Palmer Dabbelt Tested-by: Heiko Stuebner Link: https://lore.kernel.org/r/20220405071314.3225832-19-guoren@kernel.org Signed-off-by: Palmer Dabbelt

riscv: add memory-type errata for T-Head

2022-05-12T04:36:33Z

Some current cpus based on T-Head cores implement memory-types way different than described in the svpbmt spec even going so far as using PTE bits marked as reserved. Add the T-Head vendor-id and necessary errata code to replace the affected instructions. Signed-off-by: Heiko Stuebner Tested-by: Samuel Holland Link: https://lore.kernel.org/r/20220511192921.2223629-13-heiko@sntech.de Signed-off-by: Palmer Dabbelt

riscv: integrate alternatives better into the main architecture

2022-05-12T04:36:31Z

Right now the alternatives need to be explicitly enabled and erratas are limited to SiFive ones. We want to use alternatives not only for patching soc erratas, but in the future also for handling different behaviour depending on the existence of future extensions. So move the core alternatives over to the kernel subdirectory and move the CONFIG_RISCV_ALTERNATIVE to be a hidden symbol which we expect relevant erratas and extensions to just select if needed. Signed-off-by: Heiko Stuebner Reviewed-by: Philipp Tomsich Link: https://lore.kernel.org/r/20220511192921.2223629-2-heiko@sntech.de Signed-off-by: Palmer Dabbelt

riscv: compat: vdso: Add COMPAT_VDSO base code implementation

2022-04-26T20:36:53Z

There is no vgettimeofday supported in rv32 that makes simple to generate rv32 vdso code which only needs riscv64 compiler. Other architectures need change compiler or -m (machine parameter) to support vdso32 compiling. If rv32 support vgettimeofday (which cause C compile) in future, we would add CROSS_COMPILE to support that makes more requirement on compiler enviornment. linux-rv64/arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg: file format elf64-littleriscv Disassembly of section .text: 0000000000000800 <__vdso_rt_sigreturn>: 800: 08b00893 li a7,139 804: 00000073 ecall 808: 0000 unimp ... 000000000000080c <__vdso_getcpu>: 80c: 0a800893 li a7,168 810: 00000073 ecall 814: 8082 ret ... 0000000000000818 <__vdso_flush_icache>: 818: 10300893 li a7,259 81c: 00000073 ecall 820: 8082 ret linux-rv32/arch/riscv/kernel/vdso/vdso.so.dbg: file format elf32-littleriscv Disassembly of section .text: 00000800 <__vdso_rt_sigreturn>: 800: 08b00893 li a7,139 804: 00000073 ecall 808: 0000 unimp ... 0000080c <__vdso_getcpu>: 80c: 0a800893 li a7,168 810: 00000073 ecall 814: 8082 ret ... 00000818 <__vdso_flush_icache>: 818: 10300893 li a7,259 81c: 00000073 ecall 820: 8082 ret Finally, reuse all *.S from vdso in compat_vdso that makes implementation clear and readable. Signed-off-by: Guo Ren Signed-off-by: Guo Ren Tested-by: Heiko Stuebner Link: https://lore.kernel.org/r/20220405071314.3225832-17-guoren@kernel.org Signed-off-by: Palmer Dabbelt

riscv: compat: syscall: Add compat_sys_call_table implementation

2022-04-26T20:36:25Z

Implement compat sys_call_table and some system call functions: truncate64, ftruncate64, fallocate, pread64, pwrite64, sync_file_range, readahead, fadvise64_64 which need argument translation. Signed-off-by: Guo Ren Signed-off-by: Guo Ren Reviewed-by: Arnd Bergmann Tested-by: Heiko Stuebner Link: https://lore.kernel.org/r/20220405071314.3225832-12-guoren@kernel.org Signed-off-by: Palmer Dabbelt