Date: Sun, 05 Feb 2006 15:44:21 +0100 From: Andreas Tobler <toa@pop.agri.ch> To: Marius Strobl <marius@alchemy.franken.de> Cc: freebsd-sparc64@freebsd.org Subject: Re: profiling with cc Message-ID: <43E60F45.4070004@pop.agri.ch> In-Reply-To: <20060205132234.P68720@newtrinity.zeist.de> References: <43E3D228.6060801@pop.agri.ch> <20060205112432.A3868@newtrinity.zeist.de> <43E5D988.2070009@pop.agri.ch> <20060205122153.O68720@newtrinity.zeist.de> <43E5E70D.1090209@pop.agri.ch> <20060205132234.P68720@newtrinity.zeist.de>
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Marius Strobl wrote:
> On Sun, Feb 05, 2006 at 12:52:45PM +0100, Andreas Tobler wrote:
>> Marius Strobl wrote:
>>
>>> I think all it takes is the MD _mcount() -> mcount() wrapper but I'm
>>> not sure what it's actually supposed to do.
>> Ok, thank you for the pointer. I try to read through the code and see if
>> I can get something out of it.
>>
>> Build question, if I play around in this section, does it mean to
>> rebuild the whole kernel/world everytime, or is it enough to just
>> compile and install the modified parts ?
>>
>
> AFAICT the wrapper has to go into the userland version of the MCOUNT
> macro in <machine/profile.h> and you'll have to re-compile and re-
> install libc, specifically libc_p.a, in order to test it.
Good.
To my understanding, the wrapper should look similar like in
sys/amd64/include/profile.h?
#else /* !_KERNEL */
#define _MCOUNT_DECL \
static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \
static void _mcount
#ifdef __GNUCLIKE_ASM
#define MCOUNT \
__asm(".global " _mcount);\
__asm(_mcount ":");\
__asm("add %o7, 8, %o1");\
__asm("1: call 2f; nop; 2:");\
__asm("add %o7," __mcount "-1b, %o2");\
__asm("ld [%o2], %o2");\
__asm("jmpl %o2, %g0");\
__asm("add %i7, 8, %o0");
#else /* !__GNUCLIKE_ASM */
#define MCOUNT \
void \
mcount() \
{ \
}
#endif /* __GNUCLIKE_ASM */
Or am I looking to far?
The above asm code comes from NetBSD...
Thanks,
Andreas
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