From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>
The patchset includes kprobe/uprobe support and some related fixups.
Patrick provides HAVE_REGS_AND_STACK_ACCESS_API support and some
kprobe's code. The framework of k/uprobe is from csky but also refers
to other arches'.
There is no single step exception in riscv ISA, so utilize ebreak to
simulate. Some pc related instructions couldn't be executed out of line
and some system/fence instructions couldn't be a trace site at all.
So we give out a reject list and simulate list in decode-insn.c.
You could use uprobe to test simulate code like this:
echo 'p:enter_current_state_one /hello:0x6e4 a0=%a0 a1=%a1' >> /sys/kernel/debug/tracing/uprobe_events
echo 1 > /sys/kernel/debug/tracing/events/uprobes/enable
/hello
^C
cat /sys/kernel/debug/tracing/trace
tracer: nop
entries-in-buffer/entries-written: 1/1 #P:1
_-----=> irqs-off
/ _----=> need-resched
| / _---=> hardirq/softirq
|| / _--=> preempt-depth
||| / delay
TASK-PID CPU# |||| TIMESTAMP FUNCTION
| | | |||| | |
hello-94 [000] d... 55.404242: enter_current_state_one: (0x106e4) a0=0x1 a1=0x3fffa8ada8
Be care /hello:0x6e4 is the file offset in elf and it relate to 0x106e4
in memory and hello is your target elf program.
Try kprobe like this:
echo 'p:myprobe _do_fork dfd=%a0 filename=%a1 flags=%a2 mode=+4($stack)' > /sys/kernel/debug/tracing/kprobe_events
echo 'r:myretprobe _do_fork $retval' >> /sys/kernel/debug/tracing/kprobe_event
echo 1 >/sys/kernel/debug/tracing/events/kprobes/enable
cat /sys/kernel/debug/tracing/trace
tracer: nop
entries-in-buffer/entries-written: 2/2 #P:1
_-----=> irqs-off
/ _----=> need-resched
| / _---=> hardirq/softirq
|| / _--=> preempt-depth
||| / delay
TASK-PID CPU# |||| TIMESTAMP FUNCTION
| | | |||| | |
sh-92 [000] .n.. 131.804230: myprobe: (_do_fork+0x0/0x2e6) dfd=0xffffffe03929fdf8 filename=0x0 flags=0x101000 mode=0x1200000ffffffe0
sh-92 [000] d... 131.806607: myretprobe: (__do_sys_clone+0x70/0x82 <- _do_fork) arg1=0x5f
cat /sys/kernel/debug/tracing/trace
Guo Ren (4):
riscv: Fixup __vdso_gettimeofday broke dynamic ftrace
riscv: Fixup compile error BUILD_BUG_ON failed
riscv: Add kprobes supported
riscv: Add uprobes supported
Patrick Stählin (1):
RISC-V: Implement ptrace regs and stack API
arch/riscv/Kconfig | 6 +
arch/riscv/include/asm/kprobes.h | 40 +++
arch/riscv/include/asm/probes.h | 24 ++
arch/riscv/include/asm/processor.h | 1 +
arch/riscv/include/asm/ptrace.h | 29 ++
arch/riscv/include/asm/thread_info.h | 4 +-
arch/riscv/include/asm/uprobes.h | 40 +++
arch/riscv/kernel/Makefile | 1 +
arch/riscv/kernel/patch.c | 8 +-
arch/riscv/kernel/probes/Makefile | 5 +
arch/riscv/kernel/probes/decode-insn.c | 48 +++
arch/riscv/kernel/probes/decode-insn.h | 18 +
arch/riscv/kernel/probes/kprobes.c | 471 ++++++++++++++++++++++++++
arch/riscv/kernel/probes/kprobes_trampoline.S | 93 +++++
arch/riscv/kernel/probes/simulate-insn.c | 85 +++++
arch/riscv/kernel/probes/simulate-insn.h | 47 +++
arch/riscv/kernel/probes/uprobes.c | 186 ++++++++++
arch/riscv/kernel/ptrace.c | 99 ++++++
arch/riscv/kernel/signal.c | 3 +
arch/riscv/kernel/traps.c | 19 ++
arch/riscv/kernel/vdso/Makefile | 3 +
arch/riscv/mm/fault.c | 11 +
22 files changed, 1238 insertions(+), 3 deletions(-)
create mode 100644 arch/riscv/include/asm/probes.h
create mode 100644 arch/riscv/include/asm/uprobes.h
create mode 100644 arch/riscv/kernel/probes/Makefile
create mode 100644 arch/riscv/kernel/probes/decode-insn.c
create mode 100644 arch/riscv/kernel/probes/decode-insn.h
create mode 100644 arch/riscv/kernel/probes/kprobes.c
create mode 100644 arch/riscv/kernel/probes/kprobes_trampoline.S
create mode 100644 arch/riscv/kernel/probes/simulate-insn.c
create mode 100644 arch/riscv/kernel/probes/simulate-insn.h
create mode 100644 arch/riscv/kernel/probes/uprobes.c
--
2.7.4
