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ARM: ftrace: ensure that ADR takes the Thumb bit into account 

Using ADR to take the address of 'ftrace_stub' via a local label
produces an address that has the Thumb bit cleared, which means the
subsequent comparison is guaranteed to fail. Instead, use the badr
macro, which forces the Thumb bit to be set.

Fixes: a3ba87a614 ("ARM: 6316/1: ftrace: add Thumb-2 support")
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Ard Biesheuvel 2022-01-24 10:38:15 +01:00
parent 2fa3948244
commit dd88b03ff0
1 changed files with 1 additions and 1 deletions
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2
arch/arm/kernel/entry-ftrace.S
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@ -40,7 +40,7 @@
mcount_enter
ldr r0, =ftrace_trace_function
ldr r2, [r0]
adr r0, .Lftrace_stub
badr r0, .Lftrace_stub
cmp r0, r2
bne 1f