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[ARM] support tracing when using newer compilers

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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:
Uwe Kleine-König 2009-08-13 20:38:16 +02:00
parent b88fb83b13
commit 181f817eaa
3 changed files with 21 additions and 0 deletions
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1
arch/arm/include/asm/ftrace.h
View File

@ -7,6 +7,7 @@
#ifndef __ASSEMBLY__
extern void mcount(void);
extern void __gnu_mcount_nc(void);
#endif
#endif

1
arch/arm/kernel/armksyms.c
View File

@ -186,4 +186,5 @@ EXPORT_SYMBOL(_find_next_bit_be);
#ifdef CONFIG_FUNCTION_TRACER
EXPORT_SYMBOL(mcount);
EXPORT_SYMBOL(__gnu_mcount_nc);
#endif

19
arch/arm/kernel/entry-common.S
View File

@ -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