9c5777e762
* 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
69 lines
1.7 KiB
Go
69 lines
1.7 KiB
Go
package native
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// #cgo LDFLAGS: -lutil
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//#include <sys/types.h>
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//#include <sys/ptrace.h>
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//
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// #include <stdlib.h>
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//
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import "C"
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import (
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"unsafe"
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sys "golang.org/x/sys/unix"
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)
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// ptraceAttach executes the sys.PtraceAttach call.
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// pid must be a PID, not a LWPID
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func ptraceAttach(pid int) error {
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return sys.PtraceAttach(pid)
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}
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// ptraceDetach calls ptrace(PTRACE_DETACH).
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func ptraceDetach(pid int) error {
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return sys.PtraceDetach(pid)
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}
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// ptraceCont executes ptrace PTRACE_CONT
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// id may be a PID or an LWPID
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func ptraceCont(id, sig int) error {
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return sys.PtraceCont(id, sig)
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}
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// ptraceSingleStep executes ptrace PTRACE_SINGLE_STEP.
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// id may be a PID or an LWPID
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func ptraceSingleStep(id int) error {
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return sys.PtraceSingleStep(id)
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}
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// Get a list of the thread ids of a process
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func ptraceGetLwpList(pid int) (tids []int32) {
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numLWPS := C.ptrace(C.PT_GETNUMLWPS, C.pid_t(pid), C.caddr_t(unsafe.Pointer(uintptr(0))), C.int(0))
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if numLWPS < 0 {
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panic("PT_GETNUMLWPS failed")
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}
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tids = make([]int32, numLWPS)
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n := C.ptrace(C.PT_GETLWPLIST, C.pid_t(pid), C.caddr_t(unsafe.Pointer(&tids[0])), C.int(numLWPS))
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if n < 0 {
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panic("PT_GETLWPLIST failed")
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}
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return tids[0:n]
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}
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// Get info of the thread that caused wpid's process to stop.
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func ptraceGetLwpInfo(wpid int) (info sys.PtraceLwpInfoStruct, err error) {
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err = sys.PtraceLwpInfo(wpid, uintptr(unsafe.Pointer(&info)))
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return info, err
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}
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// id may be a PID or an LWPID
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func ptraceReadData(id int, addr uintptr, data []byte) (n int, err error) {
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return sys.PtraceIO(sys.PIOD_READ_D, id, addr, data, len(data))
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}
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// id may be a PID or an LWPID
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func ptraceWriteData(id int, addr uintptr, data []byte) (n int, err error) {
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return sys.PtraceIO(sys.PIOD_WRITE_D, id, addr, data, len(data))
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}
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