Mark Johnston f263e440d4 SDT probes can directly pass up to five arguments as arguments to ... dtrace_probe(). Arguments beyond these five must be obtained in an architecture-specific way; this can be done through the getargval provider method, and through dtrace_getarg() if getargval isn't overridden. This change fixes two off-by-one bugs in the way these arguments are fetched in FreeBSD's DTrace implementation. First, the SDT provider must set the aframes parameter to 1 when creating a probe. The aframes parameter controls the number of frames that dtrace_getarg() will step over in order to find the frame containing the extra arguments. On FreeBSD, dtrace_getarg() is called in SDT probe context via dtrace_probe()->dtrace_dif_emulate()->dtrace_dif_variable->dtrace_getarg() so aframes must be 3 since the arguments are in dtrace_probe()'s frame; it was previously being called with a value of 2 instead. illumos uses a different aframes value for SDT probes, but this is because illumos SDT probes fire by triggering the #UD fault handler rather than calling dtrace_probe() directly. The second bug has to do with the way arguments are grabbed out dtrace_probe()'s frame on amd64. The code currently jumps over the first stack argument and retrieves the rest of them using a pointer into the stack. This works on i386 because all of dtrace_probe()'s arguments will be on the stack and the first argument is the probe ID, which should be ignored. However, it is incorrect to ignore the first stack argument on amd64, so we correct the pointer used to access the arguments. MFC after: 2 weeks		2013-06-02 01:05:36 +00:00
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amd64	SDT probes can directly pass up to five arguments as arguments to	2013-06-02 01:05:36 +00:00
i386	Change UL to ULL since time is 32 bits.	2012-07-17 14:36:40 +00:00
mips	- For o32 ABI get arguments from the stack	2012-03-26 21:47:06 +00:00
powerpc	Add FBT for PowerPC DTrace. Also, clean up the DTrace assembly code,	2013-03-18 05:30:18 +00:00
dtrace_anon.c
dtrace_cddl.h	Add more compatibility structure members needed by the upcoming fasttrap	2010-08-22 11:04:43 +00:00
dtrace_clone.c
dtrace_debug.c	Correct a series of errors in the hand-rolled locking for drace_debug.c:	2012-12-23 15:50:37 +00:00
dtrace_hacks.c
dtrace_ioctl.c	Bring back part of r249367 by adding DTrace's temporal option, which allows	2013-05-12 16:26:33 +00:00
dtrace_load.c	Make the /dev/dtrace/helper node have the mode 0660. This allows	2010-09-01 12:08:32 +00:00
dtrace_modevent.c
dtrace_sysctl.c
dtrace_test.c	Port the SDT test now that it's possible to create SDT probes that take	2013-06-02 00:33:36 +00:00
dtrace_unload.c	Destroy the helper device when unloading.	2010-08-22 11:05:37 +00:00
dtrace_vtime.c