2
0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-23 12:43:55 +08:00
linux-next/arch/mips
Wu Zhangjin 7326c4e567 MIPS: Tracing: Make function graph tracer work with -mmcount-ra-address
That thread "MIPS: Add option to pass return address location to
_mcount" from "David Daney <ddaney@caviumnetworks.com>" have added a new
option -mmcount-ra-address to gcc(4.5) for MIPS to transfer the location
of the return address to _mcount.

Benefit from this new feature, function graph tracer on MIPS will be
easier and safer to hijack the return address of the kernel function,
which will save some overhead and make the whole thing more reliable.

In this patch, at first, try to enable the option -mmcount-ra-address in
arch/mips/Makefile with cc-option, if gcc support it, it will be
enabled, otherwise, no side effect.

and then, we need to support this new option of gcc 4.5 and also support
the old gcc versions.

with _mcount in the old gcc versions, it's not easy to get the location
of return address(tracing: add function graph tracer support for MIPS),
   so, we do it in a C function: ftrace_get_parent_addr(ftrace.c), but
   with -mmcount-ra-address, only several instructions need to get what
   we want, so, I put into asm(mcount.S). and also, as the $12(t0) is
   used by -mmcount-ra-address for transferring the localtion of return
   address to _mcount, we need to save it into the stack and restore it
   when enabled dynamic function tracer, 'Cause we have called
   "ftrace_call" before "ftrace_graph_caller", which may destroy
   $12(t0).

(Thanks to David for providing that -mcount-ra-address and giving the
 idea of KBUILD_MCOUNT_RA_ADDRESS, both of them have made the whole
 thing more beautiful!)

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Nicholas Mc Guire <der.herr@hofr.at>
Cc: zhangfx@lemote.com
Cc: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/681/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-12-17 01:57:27 +00:00
..
alchemy MIPS: Alchemy: Fix hang with high-frequency edge interrupts 2009-11-02 12:00:08 +01:00
ar7 MIPS: AR7: register watchdog device only if enabled in hw configuration 2009-11-02 12:00:03 +01:00
basler/excite MIPS: Excite: Get rid of BKL. 2009-09-30 21:47:01 +02:00
bcm47xx MIPS: Replace all usages of CL_SIZE by COMMAND_LINE_SIZE 2009-12-17 01:56:56 +00:00
bcm63xx MIPS: bcm63xx: Set the correct BCM3302 CPU name 2009-11-02 12:00:07 +01:00
boot MIPS: Remove addinitrd and CONFIG_PROBE_INITRD_HEADER 2009-12-17 01:57:07 +00:00
cavium-octeon MIPS: Octeon: Add platform devices MGMT Ethernet ports. 2009-12-17 01:56:59 +00:00
cobalt Update Yoichi Yuasa's e-mail address 2009-07-03 15:45:29 +01:00
configs MIPS: PowerTV: Base files for Cisco PowerTV platform 2009-12-17 01:57:17 +00:00
dec Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-09-18 09:15:24 -07:00
emma MIPS: Remove useless zero initializations. 2009-09-17 20:07:51 +02:00
fw MIPS: IP22: Remove an unused function 2009-12-17 01:56:56 +00:00
gt64120/wrppmc Update Yoichi Yuasa's e-mail address 2009-07-03 15:45:29 +01:00
include/asm MIPS: Tracing: Make ftrace for MIPS work without -fno-omit-frame-pointer 2009-12-17 01:57:25 +00:00
jazz MIPS: Add IRQF_TIMER flag for timer interrupts 2009-11-02 12:00:02 +01:00
kernel MIPS: Tracing: Make function graph tracer work with -mmcount-ra-address 2009-12-17 01:57:27 +00:00
lasat MIPS: Replace all usages of CL_SIZE by COMMAND_LINE_SIZE 2009-12-17 01:56:56 +00:00
lib MIPS: Fix __ndelay build error and add 'ull' suffix for 32-bit kernel 2009-06-17 11:06:24 +01:00
loongson MIPS: Loongson 2F: Add CPU frequency scaling support 2009-12-17 01:57:20 +00:00
math-emu MIPS: Collect FPU emulator statistics per-CPU. 2009-12-17 01:57:08 +00:00
mipssim MIPS: MIPSsim: Remove unused code 2009-12-17 01:57:01 +00:00
mm MIPS: Sibyte: Use hweight8 instead of counting bits 2009-12-17 01:57:16 +00:00
mti-malta MIPS: Replace all usages of CL_SIZE by COMMAND_LINE_SIZE 2009-12-17 01:56:56 +00:00
nxp MIPS: Fixup last users of irq_chip->typename 2009-12-17 01:57:21 +00:00
oprofile MIPS: oprofile: Only do performance counter handling for counter interrupts 2009-12-17 01:57:10 +00:00
pci MIPS: Lemote 2F: Add PCI support 2009-12-17 01:57:12 +00:00
pmc-sierra cpumask: arch_send_call_function_ipi_mask: mips 2009-09-24 09:34:45 +09:30
power MIPS: Use PAGE_SIZE in assembly instead of _PAGE_SIZE. 2009-09-17 20:07:48 +02:00
powertv MIPS: PowerTV: Base files for Cisco PowerTV platform 2009-12-17 01:57:17 +00:00
rb532 MIPS: Replace all usages of CL_SIZE by COMMAND_LINE_SIZE 2009-12-17 01:56:56 +00:00
sgi-ip22 MIPS: Tracing: Add IRQENTRY_EXIT section for MIPS 2009-12-17 01:57:24 +00:00
sgi-ip27 MIPS: Add IRQF_TIMER flag for timer interrupts 2009-11-02 12:00:02 +01:00
sgi-ip32 MIPS: IP32: Remove unnecessary if not even harmful volatile keywords. 2009-05-22 13:52:06 +01:00
sibyte MIPS: Replace all usages of CL_SIZE by COMMAND_LINE_SIZE 2009-12-17 01:56:56 +00:00
sni MIPS: Fixup last users of irq_chip->typename 2009-12-17 01:57:21 +00:00
txx9 MIPS: Replace all usages of CL_SIZE by COMMAND_LINE_SIZE 2009-12-17 01:56:56 +00:00
vr41xx genirq: Convert irq_desc.lock to raw_spinlock 2009-12-14 23:55:33 +01:00
Kconfig MIPS: Tracing: Add function graph tracer support for MIPS 2009-12-17 01:57:25 +00:00
Kconfig.debug MIPS: Kconfig: Fix the arch-specific header path 2008-12-12 18:12:23 +00:00
Makefile MIPS: Tracing: Make function graph tracer work with -mmcount-ra-address 2009-12-17 01:57:27 +00:00