/
ptrace_linux_amd64.go
42 lines (36 loc) · 1.73 KB
/
ptrace_linux_amd64.go
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package native
import (
"syscall"
"unsafe"
sys "golang.org/x/sys/unix"
"github.com/go-delve/delve/pkg/proc/amd64util"
)
// ptraceGetRegset returns floating point registers of the specified thread
// using PTRACE.
// See amd64_linux_fetch_inferior_registers in gdb/amd64-linux-nat.c.html
// and amd64_supply_xsave in gdb/amd64-tdep.c.html
// and Section 13.1 (and following) of Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 1: Basic Architecture
func ptraceGetRegset(tid int) (regset amd64util.AMD64Xstate, err error) {
_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETFPREGS, uintptr(tid), uintptr(0), uintptr(unsafe.Pointer(®set.AMD64PtraceFpRegs)), 0, 0)
if err == syscall.Errno(0) || err == syscall.ENODEV {
// ignore ENODEV, it just means this CPU doesn't have X87 registers (??)
err = nil
}
xstateargs := make([]byte, amd64util.AMD64XstateMaxSize())
iov := sys.Iovec{Base: &xstateargs[0], Len: uint64(len(xstateargs))}
_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETREGSET, uintptr(tid), _NT_X86_XSTATE, uintptr(unsafe.Pointer(&iov)), 0, 0)
if err != syscall.Errno(0) {
if err == syscall.ENODEV || err == syscall.EIO || err == syscall.EINVAL {
// ignore ENODEV, it just means this CPU or kernel doesn't support XSTATE, see https://github.com/go-delve/delve/issues/1022
// also ignore EIO, it means that we are running on an old kernel (pre 2.6.34) and PTRACE_GETREGSET is not implemented
// also ignore EINVAL, it means the kernel itself does not support the NT_X86_XSTATE argument (but does support PTRACE_GETREGSET)
err = nil
}
return
} else {
err = nil
}
regset.Xsave = xstateargs[:iov.Len]
err = amd64util.AMD64XstateRead(regset.Xsave, false, ®set)
return
}