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https://github.com/go-delve/delve.git
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f3a191cd73
Implement debugging function for 386 on linux with reference to AMD64. There are a few remaining problems that need to be solved in another time. 1. The stacktrace of cgo are not exactly as expected. 2. Not implement `core` for now. 3. Not implement `call` for now. Can't not find `runtime·debugCallV1` or similar function in $GOROOT/src/runtime/asm_386.s. Update #20
94 lines
3.3 KiB
Go
94 lines
3.3 KiB
Go
package native
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import "C"
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import (
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"fmt"
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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/linutil"
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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 i386_linux_fetch_inferior_registers in gdb/i386-linux-nat.c.html
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// and i386_supply_xsave in gdb/i386-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 linutil.I386Xstate, err error) {
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_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETFPREGS, uintptr(tid), uintptr(0), uintptr(unsafe.Pointer(®set.I386PtraceFpRegs)), 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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var xstateargs [_X86_XSTATE_MAX_SIZE]byte
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iov := sys.Iovec{Base: &xstateargs[0], Len: _X86_XSTATE_MAX_SIZE}
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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 = linutil.I386XstateRead(regset.Xsave, false, ®set)
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return
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}
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// PtraceGetTls return the addr of tls by PTRACE_GET_THREAD_AREA for specify thread.
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// See http://man7.org/linux/man-pages/man2/ptrace.2.html for detail about PTRACE_GET_THREAD_AREA.
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// struct user_desc at https://golang.org/src/runtime/sys_linux_386.s
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// type UserDesc struct {
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// EntryNumber uint32
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// BaseAddr uint32
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// Limit uint32
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// Flag uint32
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// }
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func PtraceGetTls(gs int32, tid int) (uint32, error) {
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ud := [4]uint32{}
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// Gs usually is 0x33
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_, _, err := syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GET_THREAD_AREA, uintptr(tid), uintptr(gs>>3), uintptr(unsafe.Pointer(&ud)), 0, 0)
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if err == syscall.ENODEV || err == syscall.EIO {
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return 0, fmt.Errorf("%s", err)
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}
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return uint32(ud[1]), nil
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}
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// ProcessVmRead calls process_vm_readv
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func ProcessVmRead(tid int, addr uintptr, data []byte) (int, error) {
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len_iov := uint32(len(data))
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local_iov := sys.Iovec{Base: &data[0], Len: len_iov}
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remote_iov := sys.Iovec{Base: (*byte)(unsafe.Pointer(addr)), Len: len_iov}
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p_local := uintptr(unsafe.Pointer(&local_iov))
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p_remote := uintptr(unsafe.Pointer(&remote_iov))
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n, _, err := syscall.Syscall6(sys.SYS_PROCESS_VM_READV, uintptr(tid), p_local, 1, p_remote, 1, 0)
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if err != syscall.Errno(0) {
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return 0, err
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}
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return int(n), nil
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}
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// ProcessVmWrite calls process_vm_writev
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func ProcessVmWrite(tid int, addr uintptr, data []byte) (int, error) {
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len_iov := uint32(len(data))
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local_iov := sys.Iovec{Base: &data[0], Len: len_iov}
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remote_iov := sys.Iovec{Base: (*byte)(unsafe.Pointer(addr)), Len: len_iov}
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p_local := uintptr(unsafe.Pointer(&local_iov))
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p_remote := uintptr(unsafe.Pointer(&remote_iov))
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n, _, err := syscall.Syscall6(sys.SYS_PROCESS_VM_WRITEV, uintptr(tid), p_local, 1, p_remote, 1, 0)
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if err != syscall.Errno(0) {
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return 0, err
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}
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return int(n), nil
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}
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