A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-05 19:31:57 -04:00
Code Issues Projects Releases Packages Wiki Activity

ANDROID: arm64: Fix the address of ftrace_call compiled with CFI_CLANG

Browse source 
When CONFIG_CFI_CLANG and CONFIG_DYNAMIC_FTRACE are enabled, LLVM will
generate a jump function named ftrace_call.cfi_jt for ftrace_call, which
makes "&ftrace_call" in ftrace_update_ftrace_func() actually the address
of ftrace_call.cfi_jt. As a result, the tracer can't be really enabled
through runtime modification. Use __va_function() to get the actual address
of ftrace_call to fix the issue.

Bug: 184105181
Signed-off-by: Ben Dai <ben.dai@unisoc.com>
Change-Id: Ic9272cd4ab447b3b145d8e397e5c9010c49f7a12
This commit is contained in:
Ben Dai 2021-03-31 09:29:17 +08:00 • committed by Alexander Winkowski
commit c69129daaf
No known key found for this signature in database
GPG key ID: 72762A66704CDE44
1 changed files with 1 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

2
arch/arm64/kernel/ftrace.c
View file

@ -55,7 +55,7 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
unsigned long pc;
u32 new;
pc = (unsigned long)&ftrace_call;
pc = (unsigned long)__va_function(ftrace_call);
new = aarch64_insn_gen_branch_imm(pc, (unsigned long)func,
AARCH64_INSN_BRANCH_LINK);