296479 |
08-Mar-2016 |
markj |
Fix fasttrap tracepoint locking.
Upstream, tracepoints are protected by per-CPU mutexes. An unlinked tracepoint may be freed once all the tracepoint mutexes have been acquired and released - this is done in fasttrap_mod_barrier(). This mechanism was not properly ported: in some places, the proc lock is used in place of a tracepoint lock, and in others the locking is omitted entirely. This change implements tracepoint locking with an rmlock, where the read lock is used in fasttrap probe context. As a side effect, this fixes a recursion on the proc lock when the raise action is used from a userland probe.
MFC after: 1 month
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291961 |
07-Dec-2015 |
markj |
Add helper functions proc_readmem() and proc_writemem().
These helper functions can be used to read in or write a buffer from or to an arbitrary process' address space. Without them, this can only be done using proc_rwmem(), which requires the caller to fill out a uio. This is onerous and results in code duplication; the new functions provide a simpler interface which is sufficient for most existing callers of proc_rwmem().
This change also adds a manual page for proc_rwmem() and the new functions.
Reviewed by: jhb, kib Differential Revision: https://reviews.freebsd.org/D4245
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242723 |
07-Nov-2012 |
jhibbits |
Implement DTrace for PowerPC. This includes both 32-bit and 64-bit.
There is one known issue: Some probes will display an error message along the lines of: "Invalid address (0)"
I tested this with both a simple dtrace probe and dtruss on a few different binaries on 32-bit. I only compiled 64-bit, did not run it, but I don't expect problems without the modules loaded. Volunteers are welcome.
MFC after: 1 month
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