riscv/ftrace: Add HAVE_FUNCTION_GRAPH_RET_ADDR_PTR support

Browse source

In walk_stackframe, the pc now receives the address from calling
ftrace_graph_ret_addr instead of manual calculation.

Note that the original calculation,
        pc = frame->ra - 4
is buggy when the instruction at the return address happened to be a
compressed inst. But since it is not a critical part of ftrace, it is
ignored for now to ease the review process.

Cc: Greentime Hu <greentime@andestech.com>
Signed-off-by: Alan Kao <alankao@andestech.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

...

This commit is contained in:

Alan Kao 2018-02-13 13:13:21 +08:00 • committed by Palmer Dabbelt

parent aea4c671fb

commit b785ec129b

No known key found for this signature in database

GPG key ID: EF4CA1502CCBAB41

2 changed files with 7 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

2

arch/riscv/kernel/ftrace.c

View file

6

arch/riscv/kernel/stacktrace.c

View file