24ec1754b2
the maximum size of the Xsave area was previously hardcoded but the CPUID instruction can be used to determine its maximum size.
42 lines
1.6 KiB
Go
42 lines
1.6 KiB
Go
package native
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import (
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"syscall"
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"unsafe"
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sys "golang.org/x/sys/unix"
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"github.com/go-delve/delve/pkg/proc/amd64util"
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)
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// ptraceGetRegset returns floating point registers of the specified thread
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// using PTRACE.
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// See amd64_linux_fetch_inferior_registers in gdb/amd64-linux-nat.c.html
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// and amd64_supply_xsave in gdb/amd64-tdep.c.html
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// and Section 13.1 (and following) of Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 1: Basic Architecture
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func ptraceGetRegset(tid int) (regset amd64util.AMD64Xstate, err error) {
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_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETFPREGS, uintptr(tid), uintptr(0), uintptr(unsafe.Pointer(®set.AMD64PtraceFpRegs)), 0, 0)
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if err == syscall.Errno(0) || err == syscall.ENODEV {
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// ignore ENODEV, it just means this CPU doesn't have X87 registers (??)
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err = nil
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}
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xstateargs := make([]byte, amd64util.AMD64XstateMaxSize())
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iov := sys.Iovec{Base: &xstateargs[0], Len: uint64(len(xstateargs))}
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_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETREGSET, uintptr(tid), _NT_X86_XSTATE, uintptr(unsafe.Pointer(&iov)), 0, 0)
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if err != syscall.Errno(0) {
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if err == syscall.ENODEV || err == syscall.EIO {
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// ignore ENODEV, it just means this CPU or kernel doesn't support XSTATE, see https://github.com/go-delve/delve/issues/1022
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// also ignore EIO, it means that we are running on an old kernel (pre 2.6.34) and PTRACE_GETREGSET is not implemented
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err = nil
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}
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return
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} else {
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err = nil
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}
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regset.Xsave = xstateargs[:iov.Len]
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err = amd64util.AMD64XstateRead(regset.Xsave, false, ®set)
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return
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}
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