Add accessors for available x86 Debug Registers
There are 8 Debug Registers on i386 (available at least since 80386) and 16
on AMD64. Currently DR4 and DR5 are reserved on both cpu-families and
DR9-DR15 are still reserved on AMD64. Therefore add accessors for DR0-DR3,
DR6-DR7 for all ports.
Debug Registers x86:
* DR0-DR3 Debug Address Registers
* DR4-DR5 Reserved
* DR6 Debug Status Register
* DR7 Debug Control Register
* DR8-DR15 Reserved
Access the registers is available only from a kernel (ring 0) as there is
needed top protected access. For this reason there is need to use special
XEN functions to get and set the registers in the XEN3 kernels.
XEN specific functions as defined in NetBSD:
- HYPERVISOR_get_debugreg()
- HYPERVISOR_set_debugreg()
This code extends the existing rdr6() and ldr6() accessor for additional:
- rdr0() & ldr0()
- rdr1() & ldr1()
- rdr2() & ldr2()
- rdr3() & ldr3()
- rdr7() & ldr7()
Traditionally accessors for DR6 were passing vaddr_t argument, while it's
appropriate type for DR0-DR3, DR6-DR7 should be using u_long, however it's
not a big deal. The resulting functionality should be equivalent so stick
to this convention and use the vaddr_t type for all DR accessors.
There was already a function defined for rdr6() in XEN, but it had a nit on
AMD64 as it was casting HYPERVISOR_get_debugreg() to u_int (32-bit on
AMD64), truncating result. It still works for DR6, but for the sake of
simplicity always return full 64-bit value.
New accessors duplicate functionality of the dr0() function available on
i386 within the KSTACK_CHECK_DR0 option. dr0() is a specialized layer with
logic to set appropriate types of interrupts, now accessors are designed to
pass verbatim values from user-land (with simple sanity checks in the
kernel). At the moment there are no plans to make possible to coexist
KSTACK_CHECK_DR0 with debug registers for user applications (debuggers).
options KSTACK_CHECK_DR0
Detect kernel stack overflow using DR0 register. This option uses DR0
register exclusively so you can't use DR0 register for other purpose
(e.g., hardware breakpoint) if you turn this on.
The KSTACK_CHECK_DR0 functionality was designed for i386 and never ported
to amd64.
Code tested on i386 and amd64 with kernels: GENERIC, XEN3_DOMU, XEN3_DOM0.
Sponsored by <The NetBSD Foundation>
This commit is contained in:
kamil
parent
264c910082
commit
266caf90fb
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@ -1,4 +1,4 @@
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/* $NetBSD: cpufunc.S,v 1.26 2016/11/27 02:32:56 kamil Exp $ */
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/* $NetBSD: cpufunc.S,v 1.27 2016/11/27 14:49:21 kamil Exp $ */
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/*-
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* Copyright (c) 1998, 2007, 2008 The NetBSD Foundation, Inc.
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@ -158,6 +158,38 @@ ENTRY(tlbflush)
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movq %rax, %cr3
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ret
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ENTRY(ldr0)
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movq %rdi, %dr0
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ret
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ENTRY(rdr0)
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movq %dr0, %rax
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ret
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ENTRY(ldr1)
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movq %rdi, %dr1
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ret
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ENTRY(rdr1)
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movq %dr1, %rax
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ret
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ENTRY(ldr2)
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movq %rdi, %dr2
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ret
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ENTRY(rdr2)
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movq %dr2, %rax
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ret
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ENTRY(ldr3)
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movq %rdi, %dr3
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ret
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ENTRY(rdr3)
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movq %dr3, %rax
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ret
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ENTRY(ldr6)
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movq %rdi, %dr6
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ret
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@ -166,6 +198,14 @@ ENTRY(rdr6)
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movq %dr6, %rax
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ret
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ENTRY(ldr7)
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movq %rdi, %dr7
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ret
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ENTRY(rdr7)
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movq %dr7, %rax
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ret
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ENTRY(x86_disable_intr)
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cli
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ret
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@ -1,4 +1,4 @@
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/* $NetBSD: i386func.S,v 1.17 2012/08/29 22:43:35 rmind Exp $ */
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/* $NetBSD: i386func.S,v 1.18 2016/11/27 14:49:21 kamil Exp $ */
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/*-
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* Copyright (c) 1998, 2007, 2008 The NetBSD Foundation, Inc.
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@ -36,7 +36,7 @@
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*/
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#include <machine/asm.h>
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__KERNEL_RCSID(0, "$NetBSD: i386func.S,v 1.17 2012/08/29 22:43:35 rmind Exp $");
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__KERNEL_RCSID(0, "$NetBSD: i386func.S,v 1.18 2016/11/27 14:49:21 kamil Exp $");
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#include <machine/specialreg.h>
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#include <machine/segments.h>
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@ -123,6 +123,50 @@ ENTRY(tlbflush)
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ret
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END(tlbflush)
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ENTRY(ldr0)
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movl 4(%esp), %eax
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movl %eax, %dr0
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ret
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END(ldr0)
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ENTRY(rdr0)
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movl %dr0, %eax
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ret
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END(rdr0)
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ENTRY(ldr1)
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movl 4(%esp), %eax
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movl %eax, %dr1
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ret
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END(ldr1)
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ENTRY(rdr1)
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movl %dr1, %eax
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ret
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END(rdr1)
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ENTRY(ldr2)
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movl 4(%esp), %eax
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movl %eax, %dr2
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ret
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END(ldr2)
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ENTRY(rdr2)
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movl %dr2, %eax
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ret
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END(rdr2)
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ENTRY(ldr3)
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movl 4(%esp), %eax
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movl %eax, %dr3
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ret
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END(ldr3)
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ENTRY(rdr3)
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movl %dr3, %eax
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ret
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END(rdr3)
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ENTRY(ldr6)
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movl 4(%esp), %eax
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movl %eax, %dr6
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@ -134,6 +178,17 @@ ENTRY(rdr6)
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ret
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END(rdr6)
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ENTRY(ldr7)
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movl 4(%esp), %eax
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movl %eax, %dr7
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ret
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END(ldr7)
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ENTRY(rdr7)
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movl %dr7, %eax
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ret
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END(rdr7)
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ENTRY(rcr2)
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movl %cr2, %eax
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ret
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@ -1,4 +1,4 @@
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/* $NetBSD: cpufunc.h,v 1.19 2016/01/05 10:20:22 hannken Exp $ */
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/* $NetBSD: cpufunc.h,v 1.20 2016/11/27 14:49:21 kamil Exp $ */
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/*-
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* Copyright (c) 1998, 2007 The NetBSD Foundation, Inc.
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@ -69,8 +69,18 @@ vaddr_t rcr8(void);
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void tlbflush(void);
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void tlbflushg(void);
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void dr0(void *, uint32_t, uint32_t, uint32_t);
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vaddr_t rdr0(void);
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void ldr0(vaddr_t);
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vaddr_t rdr1(void);
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void ldr1(vaddr_t);
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vaddr_t rdr2(void);
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void ldr2(vaddr_t);
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vaddr_t rdr3(void);
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void ldr3(vaddr_t);
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vaddr_t rdr6(void);
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void ldr6(vaddr_t);
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vaddr_t rdr7(void);
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void ldr7(vaddr_t);
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void wbinvd(void);
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void breakpoint(void);
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void x86_hlt(void);
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@ -0,0 +1,45 @@
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/* $NetBSD: dbregs.h,v 1.1 2016/11/27 14:49:21 kamil Exp $ */
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/*-
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* Copyright (c) 2016 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _X86_DBREGS_H_
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#define _X86_DBREGS_H_
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#ifdef _KERNEL
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struct lwp;
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struct dbreg;
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void reset_dbregs(void);
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int process_write_dbregs(struct lwp *lwp, const struct dbreg *regs);
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int process_read_dbregs(struct lwp *lwp, struct dbreg *regs);
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#endif
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#endif /* _X86_FPU_H_ */
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@ -1,4 +1,4 @@
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/* $NetBSD: xenfunc.c,v 1.13 2011/11/06 11:40:47 cherry Exp $ */
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/* $NetBSD: xenfunc.c,v 1.14 2016/11/27 14:49:21 kamil Exp $ */
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/*
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*
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@ -27,7 +27,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: xenfunc.c,v 1.13 2011/11/06 11:40:47 cherry Exp $");
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__KERNEL_RCSID(0, "$NetBSD: xenfunc.c,v 1.14 2016/11/27 14:49:21 kamil Exp $");
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#include <sys/param.h>
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@ -121,13 +121,66 @@ tlbflushg(void)
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tlbflush();
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}
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vaddr_t
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rdr0(void)
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{
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return HYPERVISOR_get_debugreg(0);
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}
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void
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ldr0(vaddr_t val)
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{
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HYPERVISOR_set_debugreg(0, val);
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}
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vaddr_t
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rdr1(void)
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{
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return HYPERVISOR_get_debugreg(1);
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}
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void
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ldr1(vaddr_t val)
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{
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HYPERVISOR_set_debugreg(1, val);
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}
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vaddr_t
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rdr2(void)
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{
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return HYPERVISOR_get_debugreg(2);
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}
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void
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ldr2(vaddr_t val)
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{
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HYPERVISOR_set_debugreg(2, val);
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}
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vaddr_t
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rdr3(void)
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{
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return HYPERVISOR_get_debugreg(3);
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}
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void
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ldr3(vaddr_t val)
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{
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HYPERVISOR_set_debugreg(3, val);
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}
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vaddr_t
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rdr6(void)
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{
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u_int val;
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val = HYPERVISOR_get_debugreg(6);
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return val;
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return HYPERVISOR_get_debugreg(6);
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}
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void
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HYPERVISOR_set_debugreg(6, val);
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}
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vaddr_t
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rdr7(void)
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{
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return HYPERVISOR_get_debugreg(7);
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}
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void
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ldr7(vaddr_t val)
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{
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HYPERVISOR_set_debugreg(7, val);
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}
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void
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wbinvd(void)
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{
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