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[src/trunk]: src/sys/arch/usermode Allow for setting kernel breakpoints in ou...
details: https://anonhg.NetBSD.org/src/rev/d301d66bcb0a
branches: trunk
changeset: 834249:d301d66bcb0a
user: reinoud <reinoud%NetBSD.org@localhost>
date: Fri Aug 03 11:18:22 2018 +0000
description:
Allow for setting kernel breakpoints in our remote kgdb
diffstat:
sys/arch/usermode/include/vmparam.h | 4 +-
sys/arch/usermode/usermode/db_memrw.c | 40 ++++++++++++++++++----------------
sys/arch/usermode/usermode/pmap.c | 23 ++++++++++++++-----
3 files changed, 40 insertions(+), 27 deletions(-)
diffs (155 lines):
diff -r 2081260411ae -r d301d66bcb0a sys/arch/usermode/include/vmparam.h
--- a/sys/arch/usermode/include/vmparam.h Fri Aug 03 09:54:40 2018 +0000
+++ b/sys/arch/usermode/include/vmparam.h Fri Aug 03 11:18:22 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: vmparam.h,v 1.19 2018/08/01 12:09:02 reinoud Exp $ */
+/* $NetBSD: vmparam.h,v 1.20 2018/08/03 11:18:22 reinoud Exp $ */
/*-
* Copyright (c) 2007 Jared D. McNeill <jmcneill%invisible.ca@localhost>
@@ -43,7 +43,7 @@
#define VM_MAX_ADDRESS kmem_user_end
#define VM_MAXUSER_ADDRESS kmem_user_end
#define VM_MIN_KERNEL_ADDRESS kmem_kvm_start
-#define VM_MAX_KERNEL_ADDRESS kmem_kvm_end
+#define VM_MAX_KERNEL_ADDRESS kmem_k_end
#define VM_PHYSSEG_STRAT VM_PSTRAT_BIGFIRST
#define VM_PHYSSEG_MAX 1
diff -r 2081260411ae -r d301d66bcb0a sys/arch/usermode/usermode/db_memrw.c
--- a/sys/arch/usermode/usermode/db_memrw.c Fri Aug 03 09:54:40 2018 +0000
+++ b/sys/arch/usermode/usermode/db_memrw.c Fri Aug 03 11:18:22 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: db_memrw.c,v 1.2 2018/08/01 10:27:28 reinoud Exp $ */
+/* $NetBSD: db_memrw.c,v 1.3 2018/08/03 11:18:22 reinoud Exp $ */
/*-
* Copyright (c) 1996, 2000 The NetBSD Foundation, Inc.
@@ -53,11 +53,12 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: db_memrw.c,v 1.2 2018/08/01 10:27:28 reinoud Exp $");
+__KERNEL_RCSID(0, "$NetBSD: db_memrw.c,v 1.3 2018/08/03 11:18:22 reinoud Exp $");
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
+#include <sys/mman.h>
#include <machine/pmap.h>
#include <machine/db_machdep.h>
@@ -211,29 +212,30 @@
void
db_write_bytes(vaddr_t addr, size_t size, const char *data)
{
-// extern struct bootspace bootspace;
char *dst;
-// size_t i;
+ int ret;
dst = (char *)addr;
thunk_printf_debug("\n%s : %p + %d\n", __func__, dst, (int) size);
-#if 0
- // TODO: check if we in kernel range and if so, do the mmap dance
- // ourselves?
+
+ if (db_validate_address((vaddr_t)addr)) {
+ printf("address %p is invalid\n", (void *) addr);
+ return;
+ }
- /* If any part is in kernel text or rodata, use db_write_text() */
- for (i = 0; i < BTSPACE_NSEGS; i++) {
- if (bootspace.segs[i].type != BTSEG_TEXT &&
- bootspace.segs[i].type != BTSEG_RODATA) {
- continue;
- }
- if (addr >= bootspace.segs[i].va &&
- addr < (bootspace.segs[i].va + bootspace.segs[i].sz)) {
- db_write_text(addr, size, data);
- return;
- }
+ /*
+ * if we are in the kernel range, just allow writing by using
+ * mprotect(); Note that this needs an unprotected binary, set with
+ * `paxctl -agm netbsd`
+ */
+ if (addr > kmem_k_start) {
+ ret = thunk_mprotect((void *) trunc_page(addr), PAGE_SIZE,
+ PROT_READ | PROT_WRITE | PROT_EXEC);
+ if (ret != 0)
+ panic("please unprotect kernel binary with "
+ "`paxctl -agm netbsd`");
+ assert(ret == 0);
}
-#endif
dst = (char *)addr;
diff -r 2081260411ae -r d301d66bcb0a sys/arch/usermode/usermode/pmap.c
--- a/sys/arch/usermode/usermode/pmap.c Fri Aug 03 09:54:40 2018 +0000
+++ b/sys/arch/usermode/usermode/pmap.c Fri Aug 03 11:18:22 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: pmap.c,v 1.111 2018/08/03 06:52:50 reinoud Exp $ */
+/* $NetBSD: pmap.c,v 1.112 2018/08/03 11:18:22 reinoud Exp $ */
/*-
* Copyright (c) 2011 Reinoud Zandijk <reinoud%NetBSD.org@localhost>
@@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.111 2018/08/03 06:52:50 reinoud Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.112 2018/08/03 11:18:22 reinoud Exp $");
#include "opt_memsize.h"
#include "opt_kmempages.h"
@@ -139,7 +139,7 @@
struct pmap *pmap;
paddr_t DRAM_cfg;
paddr_t fpos, file_len;
- paddr_t pv_fpos, tlb_fpos, pm_l1_fpos, pm_fpos;
+ paddr_t kernel_fpos, pv_fpos, tlb_fpos, pm_l1_fpos, pm_fpos;
paddr_t wlen;
paddr_t barrier_len;
paddr_t pv_table_size;
@@ -281,9 +281,11 @@
assert(err == 0);
/* map the kernel at the start of the 'memory' file */
- written = thunk_pwrite(mem_fh, (void *) kmem_k_start, kmem_k_length, 0);
+ kernel_fpos = 0;
+ written = thunk_pwrite(mem_fh, (void *) kmem_k_start, kmem_k_length,
+ kernel_fpos);
assert(written == kmem_k_length);
- fpos = kmem_k_length;
+ fpos = kernel_fpos + kmem_k_length;
/* initialize counters */
free_start = fpos; /* in physical space ! */
@@ -298,7 +300,7 @@
(uint64_t) pv_table_size/1024, (uintptr_t) phys_npages);
/* calculate number of pmap entries needed for a complete map */
- pm_nentries = (kmem_k_start - VM_MIN_ADDRESS) / PAGE_SIZE;
+ pm_nentries = (kmem_k_end - VM_MIN_ADDRESS) / PAGE_SIZE;
pm_entries_size = round_page(pm_nentries * sizeof(struct pv_entry *));
thunk_printf_debug("tlb va->pa lookup table is %"PRIu64" KB for "
"%d logical pages\n", pm_entries_size/1024, pm_nentries);
@@ -417,6 +419,15 @@
pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, 0);
}
thunk_printf_debug("kernel pmap entries mem added to the kernel pmap\n");
+#if 0
+ /* not yet, or not needed */
+ for (pg = 0; pg < kmem_k_length; pg += PAGE_SIZE) {
+ pa = kernel_fpos + pg;
+ va = (vaddr_t) kmem_k_start + pg;
+ pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE, 0);
+ }
+ thunk_printf_debug("kernel mem added to the kernel pmap\n");
+#endif
/* add file space to uvm's FREELIST */
uvm_page_physload(atop(0),
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