Joel Sing 9c5777e762 pkg/proc: fix and improve freebsd register handling (#3019) ...

* pkg/proc: convert freebsd ptrace code to cgo

There is little point in having cgo call a custom C function, when the same
can be done directly from cgo (with less code and effort). Split the amd64
specific code into ptrace_freebsd_amd64.go. Also avoid mixing C.ptrace()
with syscall.SYS_PTRACE.

This will make further changes easier - no functional change intended.

* pkg/proc: check return values of ptrace calls on freebsd

The return values of the PT_GETNUMLWPS and PT_GETLWPLIST ptrace calls were
previously unchecked. While these should not fail, panic instead of using
-1 with slice allocation/handling.

* pkg/proc: return *amd64util.AMD64Xstate from freebsd ptraceGetRegset

Return a pointer to a struct, rather than a struct - this simplifies the
code in both the caller and the ptraceGetRegset function, while also avoiding
struct copying.

* pkg/proc: fix floating point register setting on freebsd

The original code could never work - PT_SETREGS on freebsd does not
take an iovec, nor does it set FP registers. Furthermore, the xsave
bytes were not stored in the amd64util.AMD64Xstate struct.

Updates #3001

* pkg/proc: re-enable function call injection on freebsd

Floating point registers can now be set and restored correctly.

This is a partial revert of 51090f003bace1f8cc37b8480ffdb6f6cc91fa5a.

Fixes #3001

* pkg/proc: deduplicate register setting code on freebsd

2022-05-31 16:04:36 -07:00

..

regs.go

pkg/proc: fix and improve freebsd register handling (#3019)

2022-05-31 16:04:36 -07:00