Tong Tiangen 252c765bd7 riscv, bpf: Add BPF exception tables ... When a tracing BPF program attempts to read memory without using the bpf_probe_read() helper, the verifier marks the load instruction with the BPF_PROBE_MEM flag. Since the riscv JIT does not currently recognize this flag it falls back to the interpreter. Add support for BPF_PROBE_MEM, by appending an exception table to the BPF program. If the load instruction causes a data abort, the fixup infrastructure finds the exception table and fixes up the fault, by clearing the destination register and jumping over the faulting instruction. A more generic solution would add a "handler" field to the table entry, like on x86 and s390. The same issue in ARM64 is fixed in 8008342853 ("bpf, arm64: Add BPF exception tables"). Signed-off-by: Tong Tiangen <tongtiangen@huawei.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Tested-by: Pu Lehui <pulehui@huawei.com> Tested-by: Björn Töpel <bjorn@kernel.org> Acked-by: Björn Töpel <bjorn@kernel.org> Link: https://lore.kernel.org/bpf/20211027111822.3801679-1-tongtiangen@huawei.com		2021-10-28 01:02:44 +02:00
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boot	riscv: dts: microchip: mpfs-icicle: Fix serial console	2021-09-10 23:58:19 -07:00
configs	riscv: defconfig: enable NLS_CODEPAGE_437, NLS_ISO8859_1	2021-09-10 21:31:12 -07:00
errata	riscv: skip errata_cip_453.o if CONFIG_ERRATA_SIFIVE_CIP_453 is disabled	2021-06-01 21:16:41 -07:00
include	riscv: Improve stack randomisation on RV64	2021-09-10 22:25:34 -07:00
kernel	Updates for the SMP and CPU hotplug:	2021-09-12 12:42:51 -07:00
lib	riscv: __asm_copy_to-from_user: Fix: Typos in comments	2021-07-23 17:49:12 -07:00
mm	riscv, bpf: Add BPF exception tables	2021-10-28 01:02:44 +02:00
net	riscv, bpf: Add BPF exception tables	2021-10-28 01:02:44 +02:00
Kbuild	riscv: Allow device trees to be built into the kernel	2020-05-18 11:38:05 -07:00
Kconfig	Merge branch 'gcc-min-version-5.1' (make gcc-5.1 the minimum version)	2021-09-13 10:43:04 -07:00
Kconfig.debug	RISC-V: Remove EARLY_PRINTK support	2018-12-17 10:23:46 -08:00
Kconfig.erratas	riscv: enable SiFive errata CIP-453 and CIP-1200 Kconfig only if CONFIG_64BIT=y	2021-05-06 09:40:13 -07:00
Kconfig.socs	riscv: sifive: fix Kconfig errata warning	2021-06-12 17:20:50 -07:00
Makefile	riscv: move the (z)install rules to arch/riscv/Makefile	2021-09-10 23:08:26 -07:00