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When checking for the valid value of the frame pointer, verify that it
belongs to the kernel stack address range for the thread.
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Use single instance of the identical INKERNEL() and PMC_IN_KERNEL()
macros on amd64 and i386. On i386, correct the lowest kernel address.
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Bound the number of frames traversed when executing the ustackdepth action.
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r267759:
Fix a couple of bugs on amd64 when fetching probe arguments beyond the
first five for probes entered through a UD fault (i.e. FBT probes).
Specifically, handle the fact that dtrace_invop_callsite must be
16 byte-aligned and thus may not immediately follow the call to
dtrace_invop() in dtrace_invop_start(). Also fetch register arguments and
the stack pointer through a struct trapframe instead of a struct reg.
r267761:
Fix some bugs when fetching probe arguments in i386. Firstly ensure that
the 4 byte-aligned dtrace_invop_callsite can be found and that it
immediately follows the call to dtrace_invop(). Secondly, fix some pointer
arithmetic to account for differences between struct i386_frame and illumos'
struct frame. Finally, ensure that dtrace_getarg() isn't inlined. It works
by following a fixed number of frame pointers to the probe site, so inlining
breaks it.
PR: 191260
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o uregs (sson@)
o ustack (sson@)
o /dev/dtrace/helper device (needed for USDT probes)
The work done by me was:
Sponsored by: The FreeBSD Foundation
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