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-rw-r--r--arch/arm/kernel/entry-common.S15
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 520889cf1b5b..9fd0ba90c1d2 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -149,6 +149,11 @@ ENDPROC(ret_from_fork)
#endif
#endif
+.macro mcount_adjust_addr rd, rn
+ bic \rd, \rn, #1 @ clear the Thumb bit if present
+ sub \rd, \rd, #MCOUNT_INSN_SIZE
+.endm
+
.macro __mcount suffix
mcount_enter
ldr r0, =ftrace_trace_function
@@ -173,8 +178,7 @@ ENDPROC(ret_from_fork)
mcount_exit
1: mcount_get_lr r1 @ lr of instrumented func
- mov r0, lr @ instrumented function
- sub r0, r0, #MCOUNT_INSN_SIZE
+ mcount_adjust_addr r0, lr @ instrumented function
adr lr, BSYM(2f)
mov pc, r2
2: mcount_exit
@@ -184,8 +188,7 @@ ENDPROC(ret_from_fork)
mcount_enter
mcount_get_lr r1 @ lr of instrumented func
- mov r0, lr @ instrumented function
- sub r0, r0, #MCOUNT_INSN_SIZE
+ mcount_adjust_addr r0, lr @ instrumented function
.globl ftrace_call\suffix
ftrace_call\suffix:
@@ -205,11 +208,11 @@ ftrace_graph_call\suffix:
#ifdef CONFIG_DYNAMIC_FTRACE
@ called from __ftrace_caller, saved in mcount_enter
ldr r1, [sp, #16] @ instrumented routine (func)
+ mcount_adjust_addr r1, r1
#else
@ called from __mcount, untouched in lr
- mov r1, lr @ instrumented routine (func)
+ mcount_adjust_addr r1, lr @ instrumented routine (func)
#endif
- sub r1, r1, #MCOUNT_INSN_SIZE
mov r2, fp @ frame pointer
bl prepare_ftrace_return
mcount_exit