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https://github.com/go-delve/delve.git
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e0c80c8612
- move the cpuid querying code to pkg/proc/native/cpuid since pkg/proc/native is the only package entitled to calling it - add a type to describe the xstate_bv bitmap instead of using hardcoded constants everywhere - use xcr0 instead of xstate_bv for the offset heuristic like gdb does
44 lines
1.8 KiB
Go
44 lines
1.8 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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"github.com/go-delve/delve/pkg/proc/native/cpuid"
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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, cpuid.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 || err == syscall.EINVAL {
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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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// also ignore EINVAL, it means the kernel itself does not support the NT_X86_XSTATE argument (but does support PTRACE_GETREGSET)
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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, cpuid.AMD64XstateZMMHi256Offset())
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return
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}
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