mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 17:59:32 +00:00
[ARM] support tracing when using newer compilers
Since gcc 4.4 the name and calling convention for function profiling on ARM changed. With this patch both types are supported. See http://sourceware.org/ml/libc-ports/2008-04/msg00009.html for some details. Lightly-Tested-by: Anand Gadiyar <gadiyar@ti.com> Tested-by: Kevin Hilman <khilman@deeprootsystems.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
This commit is contained in:
parent
b88fb83b13
commit
181f817eaa
3 changed files with 21 additions and 0 deletions
|
@ -7,6 +7,7 @@
|
|||
|
||||
#ifndef __ASSEMBLY__
|
||||
extern void mcount(void);
|
||||
extern void __gnu_mcount_nc(void);
|
||||
#endif
|
||||
|
||||
#endif
|
||||
|
|
|
@ -186,4 +186,5 @@ EXPORT_SYMBOL(_find_next_bit_be);
|
|||
|
||||
#ifdef CONFIG_FUNCTION_TRACER
|
||||
EXPORT_SYMBOL(mcount);
|
||||
EXPORT_SYMBOL(__gnu_mcount_nc);
|
||||
#endif
|
||||
|
|
|
@ -132,6 +132,25 @@ ftrace_call:
|
|||
|
||||
#else
|
||||
|
||||
ENTRY(__gnu_mcount_nc)
|
||||
stmdb sp!, {r0-r3, lr}
|
||||
ldr r0, =ftrace_trace_function
|
||||
ldr r2, [r0]
|
||||
adr r0, ftrace_stub
|
||||
cmp r0, r2
|
||||
bne gnu_trace
|
||||
ldmia sp!, {r0-r3, ip, lr}
|
||||
bx ip
|
||||
|
||||
gnu_trace:
|
||||
ldr r1, [sp, #20] @ lr of instrumented routine
|
||||
mov r0, lr
|
||||
sub r0, r0, #MCOUNT_INSN_SIZE
|
||||
mov lr, pc
|
||||
mov pc, r2
|
||||
ldmia sp!, {r0-r3, ip, lr}
|
||||
bx ip
|
||||
|
||||
ENTRY(mcount)
|
||||
stmdb sp!, {r0-r3, lr}
|
||||
ldr r0, =ftrace_trace_function
|
||||
|
|
Loading…
Reference in a new issue