a6685247e0
When cgo is used the address of the g struct is saved on the special register TPIDR_EL0. Because executing C code could overwrite the contents of R28 that normally contains the address of g we should read it from TPIDR_EL0 instead when runtime.iscgo is set.
119 lines
3.4 KiB
Go
119 lines
3.4 KiB
Go
package native
|
|
|
|
import (
|
|
"debug/elf"
|
|
"fmt"
|
|
"syscall"
|
|
"unsafe"
|
|
|
|
sys "golang.org/x/sys/unix"
|
|
|
|
"github.com/go-delve/delve/pkg/proc"
|
|
"github.com/go-delve/delve/pkg/proc/linutil"
|
|
)
|
|
|
|
const (
|
|
_AARCH64_GREGS_SIZE = 34 * 8
|
|
_AARCH64_FPREGS_SIZE = 32*16 + 8
|
|
_NT_ARM_TLS = 0x401 // used in PTRACE_GETREGSET on ARM64 to retrieve the value of TPIDR_EL0, see source/include/uapi/linux/elf.h and source/arch/arm64/kernel/ptrace.c
|
|
)
|
|
|
|
func ptraceGetGRegs(pid int, regs *linutil.ARM64PtraceRegs) (err error) {
|
|
iov := sys.Iovec{Base: (*byte)(unsafe.Pointer(regs)), Len: _AARCH64_GREGS_SIZE}
|
|
_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETREGSET, uintptr(pid), uintptr(elf.NT_PRSTATUS), uintptr(unsafe.Pointer(&iov)), 0, 0)
|
|
if err == syscall.Errno(0) {
|
|
err = nil
|
|
}
|
|
return
|
|
}
|
|
|
|
func ptraceGetTpidr_el0(pid int, tpidr_el0 *uint64) (err error) {
|
|
iov := sys.Iovec{Base: (*byte)(unsafe.Pointer(tpidr_el0)), Len: uint64(unsafe.Sizeof(*tpidr_el0))}
|
|
_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETREGSET, uintptr(pid), uintptr(_NT_ARM_TLS), uintptr(unsafe.Pointer(&iov)), 0, 0)
|
|
if err == syscall.Errno(0) {
|
|
err = nil
|
|
}
|
|
return
|
|
}
|
|
|
|
func ptraceSetGRegs(pid int, regs *linutil.ARM64PtraceRegs) (err error) {
|
|
iov := sys.Iovec{Base: (*byte)(unsafe.Pointer(regs)), Len: _AARCH64_GREGS_SIZE}
|
|
_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_SETREGSET, uintptr(pid), uintptr(elf.NT_PRSTATUS), uintptr(unsafe.Pointer(&iov)), 0, 0)
|
|
if err == syscall.Errno(0) {
|
|
err = nil
|
|
}
|
|
return
|
|
}
|
|
|
|
// ptraceGetFpRegset returns floating point registers of the specified thread
|
|
// using PTRACE.
|
|
func ptraceGetFpRegset(tid int) (fpregset []byte, err error) {
|
|
var arm64_fpregs [_AARCH64_FPREGS_SIZE]byte
|
|
iov := sys.Iovec{Base: &arm64_fpregs[0], Len: _AARCH64_FPREGS_SIZE}
|
|
_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETREGSET, uintptr(tid), uintptr(elf.NT_FPREGSET), uintptr(unsafe.Pointer(&iov)), 0, 0)
|
|
if err != syscall.Errno(0) {
|
|
if err == syscall.ENODEV {
|
|
err = nil
|
|
}
|
|
return
|
|
} else {
|
|
err = nil
|
|
}
|
|
|
|
fpregset = arm64_fpregs[:iov.Len-8]
|
|
return fpregset, err
|
|
}
|
|
|
|
// SetPC sets PC to the value specified by 'pc'.
|
|
func (thread *nativeThread) SetPC(pc uint64) error {
|
|
ir, err := registers(thread)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
r := ir.(*linutil.ARM64Registers)
|
|
r.Regs.Pc = pc
|
|
thread.dbp.execPtraceFunc(func() { err = ptraceSetGRegs(thread.ID, r.Regs) })
|
|
return err
|
|
}
|
|
|
|
// SetSP sets RSP to the value specified by 'sp'
|
|
func (thread *nativeThread) SetSP(sp uint64) (err error) {
|
|
var ir proc.Registers
|
|
ir, err = registers(thread)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
r := ir.(*linutil.ARM64Registers)
|
|
r.Regs.Sp = sp
|
|
thread.dbp.execPtraceFunc(func() { err = ptraceSetGRegs(thread.ID, r.Regs) })
|
|
return
|
|
}
|
|
|
|
func (thread *nativeThread) SetDX(dx uint64) (err error) {
|
|
return fmt.Errorf("not supported")
|
|
}
|
|
|
|
func registers(thread *nativeThread) (proc.Registers, error) {
|
|
var (
|
|
regs linutil.ARM64PtraceRegs
|
|
err error
|
|
)
|
|
thread.dbp.execPtraceFunc(func() { err = ptraceGetGRegs(thread.ID, ®s) })
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var tpidr_el0 uint64
|
|
if thread.dbp.iscgo {
|
|
thread.dbp.execPtraceFunc(func() { err = ptraceGetTpidr_el0(thread.ID, &tpidr_el0) })
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
r := linutil.NewARM64Registers(®s, thread.dbp.iscgo, tpidr_el0, func(r *linutil.ARM64Registers) error {
|
|
var floatLoadError error
|
|
r.Fpregs, r.Fpregset, floatLoadError = thread.fpRegisters()
|
|
return floatLoadError
|
|
})
|
|
return r, nil
|
|
}
|