Guo Ren e05d57dcb8 riscv: Fixup __vdso_gettimeofday broke dynamic ftrace ... For linux-5.8-rc1, enable ftrace of riscv will cause boot panic: [ 2.388980] Run /sbin/init as init process [ 2.529938] init[39]: unhandled signal 4 code 0x1 at 0x0000003ff449e000 [ 2.531078] CPU: 0 PID: 39 Comm: init Not tainted 5.8.0-rc1-dirty #13 [ 2.532719] epc: 0000003ff449e000 ra : 0000003ff449e954 sp : 0000003fffedb900 [ 2.534005] gp : 00000000000e8528 tp : 0000003ff449d800 t0 : 000000000000001e [ 2.534965] t1 : 000000000000000a t2 : 0000003fffedb89e s0 : 0000003fffedb920 [ 2.536279] s1 : 0000003fffedb940 a0 : 0000003ff43d4b2c a1 : 0000000000000000 [ 2.537334] a2 : 0000000000000001 a3 : 0000000000000000 a4 : fffffffffbad8000 [ 2.538466] a5 : 0000003ff449e93a a6 : 0000000000000000 a7 : 0000000000000000 [ 2.539511] s2 : 0000000000000000 s3 : 0000003ff448412c s4 : 0000000000000010 [ 2.541260] s5 : 0000000000000016 s6 : 00000000000d0a30 s7 : 0000003fffedba70 [ 2.542152] s8 : 0000000000000000 s9 : 0000000000000000 s10: 0000003fffedb960 [ 2.543335] s11: 0000000000000000 t3 : 0000000000000000 t4 : 0000003fffedb8a0 [ 2.544471] t5 : 0000000000000000 t6 : 0000000000000000 [ 2.545730] status: 0000000000004020 badaddr: 00000000464c457f cause: 0000000000000002 [ 2.549867] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004 [ 2.551267] CPU: 0 PID: 1 Comm: init Not tainted 5.8.0-rc1-dirty #13 [ 2.552061] Call Trace: [ 2.552626] [<ffffffe00020374a>] walk_stackframe+0x0/0xc4 [ 2.553486] [<ffffffe0002039f4>] show_stack+0x40/0x4c [ 2.553995] [<ffffffe00054a6ae>] dump_stack+0x7a/0x98 [ 2.554615] [<ffffffe00020b9b8>] panic+0x114/0x2f4 [ 2.555395] [<ffffffe00020ebd6>] do_exit+0x89c/0x8c2 [ 2.555949] [<ffffffe00020f930>] do_group_exit+0x3a/0x90 [ 2.556715] [<ffffffe000219e08>] get_signal+0xe2/0x6e6 [ 2.557388] [<ffffffe000202d72>] do_notify_resume+0x6a/0x37a [ 2.558089] [<ffffffe000201c16>] ret_from_exception+0x0/0xc "ra:0x3ff449e954" is the return address of "call _mcount" in the prologue of __vdso_gettimeofday(). Without proper relocate, pc jmp to 0x0000003ff449e000 (vdso map base) with a illegal instruction trap. The solution comes from arch/arm64/kernel/vdso/Makefile: CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) - CC_FLAGS_SCS is ShadowCallStack feature in Clang and only implemented for arm64, no use for riscv. Fixes: ad5d1122b8 ("riscv: use vDSO common flow to reduce the latency of the time-related functions") Cc: stable@vger.kernel.org Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Reviewed-by: Vincent Chen <vincent.chen@sifive.com> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>		2020-06-25 15:38:39 -07:00
..
vdso	riscv: Fixup __vdso_gettimeofday broke dynamic ftrace	2020-06-25 15:38:39 -07:00
.gitignore	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
asm-offsets.c
cacheinfo.c	riscv: cacheinfo: Implement cache_get_priv_group with a generic ops structure	2020-05-20 15:05:05 -07:00
clint.c
cpu_ops_sbi.c	RISC-V: Support cpu hotplug	2020-03-31 11:28:30 -07:00
cpu_ops_spinwait.c	RISC-V: Add cpu_ops and modify default booting method	2020-03-31 11:25:56 -07:00
cpu_ops.c	riscv: force __cpu_up_ variables to put in data section	2020-05-04 15:03:25 -07:00
cpu-hotplug.c	RISC-V: Support cpu hotplug	2020-03-31 11:28:30 -07:00
cpu.c	RISC-V: Rename and move plic_find_hart_id() to arch directory	2020-06-09 19:11:20 -07:00
cpufeature.c	RISC-V: Add bitmap reprensenting ISA features common across CPUs	2020-05-04 14:08:59 -07:00
entry.S	RISC-V: Remove do_IRQ() function	2020-06-09 19:11:24 -07:00
fpu.S
ftrace.c	maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault	2020-06-17 10:57:41 -07:00
head.h
head.S	RISC-V: Skip setting up PMPs on traps	2020-05-18 11:38:08 -07:00
irq.c	RISC-V: Remove do_IRQ() function	2020-06-09 19:11:24 -07:00
kgdb.c	maccess: rename probe_kernel_address to get_kernel_nofault	2020-06-18 11:14:40 -07:00
Makefile	riscv: Add KGDB support	2020-05-18 11:38:10 -07:00
mcount-dyn.S
mcount.S
module-sections.c
module.c	mm: introduce include/linux/pgtable.h	2020-06-09 09:39:13 -07:00
module.lds
patch.c	maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault	2020-06-17 10:57:41 -07:00
perf_callchain.c
perf_event.c	riscv: perf_event: Make some funciton static	2020-05-11 13:48:19 -07:00
perf_regs.c
process.c	RISC-V: gp_in_global needs register keyword	2020-05-21 13:28:26 -07:00
ptrace.c	riscv: fix seccomp reject syscall code path	2020-03-05 13:58:15 -08:00
reset.c
riscv_ksyms.c	riscv: Add KASAN support	2020-01-22 13:09:58 -08:00
sbi.c	riscv: sbi: Fix undefined reference to sbi_shutdown	2020-04-21 16:15:09 -07:00
setup.c	mm: don't include asm/pgtable.h if linux/mm.h is already included	2020-06-09 09:39:13 -07:00
signal.c
smp.c	RISC-V: self-contained IPI handling routine	2020-06-09 19:11:19 -07:00
smpboot.c	RISC-V: Add supported for ordered booting method using HSM	2020-03-31 11:27:50 -07:00
soc.c	mm: introduce include/linux/pgtable.h	2020-06-09 09:39:13 -07:00
stacktrace.c	kernel: rename show_stack_loglvl() => show_stack()	2020-06-09 09:39:13 -07:00
sys_riscv.c	RISC-V: Don't allow write+exec only page mapping request in mmap	2020-06-18 17:28:53 -07:00
syscall_table.c
time.c	riscv: use vDSO common flow to reduce the latency of the time-related functions	2020-06-10 19:47:16 -07:00
traps_misaligned.c	riscv: Unaligned load/store handling for M_MODE	2020-04-03 10:45:33 -07:00
traps.c	maccess: rename probe_kernel_address to get_kernel_nofault	2020-06-18 11:14:40 -07:00
vdso.c	RISC-V Patches for the 5.8 Merge Window, Part 2	2020-06-11 12:55:20 -07:00
vmlinux.lds.S	riscv: Allow device trees to be built into the kernel	2020-05-18 11:38:05 -07:00