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:
ad5d1122b82f ("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>