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riscv: Add ftrace_stub_graph

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Commit 883bbbffa5 ("ftrace,kcfi: Separate ftrace_stub() and
ftrace_stub_graph()") added a separate ftrace_stub_graph function for
CFI_CLANG. Add the stub to fix FUNCTION_GRAPH_TRACER compatibility
with CFI.

Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lore.kernel.org/r/20230710183544.999540-11-samitolvanen@google.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Sami Tolvanen 2023-07-10 18:35:48 +00:00 committed by Palmer Dabbelt
parent 5f59c6855b
commit f3a0c23f25
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1 changed files with 4 additions and 0 deletions
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4
arch/riscv/kernel/mcount.S
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@ -57,6 +57,10 @@ SYM_TYPED_FUNC_START(ftrace_stub)
SYM_FUNC_END(ftrace_stub)
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
SYM_TYPED_FUNC_START(ftrace_stub_graph)
ret
SYM_FUNC_END(ftrace_stub_graph)
ENTRY(return_to_handler)
/*
* On implementing the frame point test, the ideal way is to compare the