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[src/trunk]: src/sys/arch/usermode/usermode Implement first generation of mem...
details: https://anonhg.NetBSD.org/src/rev/6dce3b92fc05
branches: trunk
changeset: 768704:6dce3b92fc05
user: reinoud <reinoud%NetBSD.org@localhost>
date: Thu Aug 25 14:37:57 2011 +0000
description:
Implement first generation of memory access handler for the kernel.
diffstat:
sys/arch/usermode/usermode/pmap.c | 12 ++-
sys/arch/usermode/usermode/trap.c | 117 +++++++++++++++++++++++++++++++++++++-
2 files changed, 123 insertions(+), 6 deletions(-)
diffs (192 lines):
diff -r dd1dcf332f3e -r 6dce3b92fc05 sys/arch/usermode/usermode/pmap.c
--- a/sys/arch/usermode/usermode/pmap.c Thu Aug 25 14:24:48 2011 +0000
+++ b/sys/arch/usermode/usermode/pmap.c Thu Aug 25 14:37:57 2011 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: pmap.c,v 1.33 2011/08/25 10:46:59 reinoud Exp $ */
+/* $NetBSD: pmap.c,v 1.34 2011/08/25 14:37:57 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 1.33 2011/08/25 10:46:59 reinoud Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.34 2011/08/25 14:37:57 reinoud Exp $");
#include "opt_memsize.h"
#include "opt_kmempages.h"
@@ -94,6 +94,8 @@
static void pv_free(struct pv_entry *pv);
static void pmap_deferred_init(void);
+extern void setup_signal_handlers(void);
+
/* exposed to signal handler */
vaddr_t kmem_k_start, kmem_k_end;
vaddr_t kmem_ext_start, kmem_ext_end;
@@ -164,7 +166,7 @@
mpos += kmem_len;
kmem_ext_end = mpos;
-#if 0
+#if 1
/* protect complete UVM area (---) */
addr = thunk_mmap((void*) mem_uvm,
uvm_len,
@@ -319,6 +321,8 @@
/* create pmap pool */
pool_init(&pmap_pool, sizeof(struct pmap), 0, 0, 0,
"pmappool", NULL, IPL_NONE);
+
+ setup_signal_handlers();
}
pmap_t
@@ -661,7 +665,7 @@
void
pmap_kremove(vaddr_t va, vsize_t size)
{
-aprint_debug("pmap_kremove not implented\n'");
+ pmap_remove(pmap_kernel(), va, va + size);
}
void
diff -r dd1dcf332f3e -r 6dce3b92fc05 sys/arch/usermode/usermode/trap.c
--- a/sys/arch/usermode/usermode/trap.c Thu Aug 25 14:24:48 2011 +0000
+++ b/sys/arch/usermode/usermode/trap.c Thu Aug 25 14:37:57 2011 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: trap.c,v 1.2 2009/10/21 16:07:00 snj Exp $ */
+/* $NetBSD: trap.c,v 1.3 2011/08/25 14:37:57 reinoud Exp $ */
/*-
* Copyright (c) 2007 Jared D. McNeill <jmcneill%invisible.ca@localhost>
@@ -27,14 +27,127 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.2 2009/10/21 16:07:00 snj Exp $");
+__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.3 2011/08/25 14:37:57 reinoud Exp $");
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
+#include <uvm/uvm_extern.h>
+#include <machine/cpu.h>
+//#include <machine/ctlreg.h>
+//#include <machine/trap.h>
+//#include <machine/instr.h>
+#include <machine/pcb.h>
+#include <machine/pmap.h>
+//#include <machine/userret.h>
+#include <machine/thunk.h>
+
+
+void setup_signal_handlers(void);
+static void mem_access_handler(int sig, siginfo_t *info, void *ctx);
+
+static struct sigaction sa;
+extern int errno;
void
startlwp(void *arg)
{
+
}
+
+void
+setup_signal_handlers(void)
+{
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = SA_RESTART | SA_SIGINFO;
+ sa.sa_sigaction = mem_access_handler;
+ if (thunk_sigaction(SIGSEGV, &sa, NULL) == -1)
+ panic("couldn't register SIGSEGV handler : %d", errno);
+ if (thunk_sigaction(SIGBUS, &sa, NULL) == -1)
+ panic("couldn't register SIGBUS handler : %d", errno);
+}
+
+static struct trapframe kernel_tf;
+
+static void
+mem_access_handler(int sig, siginfo_t *info, void *ctx)
+{
+ struct proc *p;
+ struct lwp *l;
+ struct pcb *pcb;
+ struct vmspace *vm;
+ struct vm_map *vm_map;
+ struct trapframe *tf;
+ vm_prot_t atype;
+ vaddr_t va;
+ vaddr_t onfault;
+ int kmem, rv;
+
+printf("trap\n");
+ if ((info->si_signo == SIGSEGV) || (info->si_signo == SIGBUS)) {
+ l = curlwp;
+ p = l->l_proc;
+ pcb = lwp_getpcb(l);
+ onfault = (vaddr_t) pcb->pcb_onfault;
+ vm = p->p_vmspace;
+
+#if 0
+ printf("SIGSEGV or SIGBUS!\n");
+ printf("\tsi_signo = %d\n", info->si_signo);
+ printf("\tsi_errno = %d\n", info->si_errno);
+ printf("\tsi_code = %d\n", info->si_code);
+ if (info->si_code == SEGV_MAPERR) {
+ printf("\t\tSEGV_MAPERR\n");
+ }
+ if (info->si_code == SEGV_ACCERR) {
+ printf("\t\tSEGV_ACCERR\n");
+ }
+ if (info->si_code == BUS_ADRALN) {
+ printf("\t\tBUS_ADRALN\n");
+ }
+ if (info->si_code == BUS_ADRERR) {
+ printf("\t\tBUS_ADRERR\n");
+ }
+ if (info->si_code == BUS_OBJERR) {
+ printf("\t\tBUS_OBJERR\n");
+ }
+ printf("\tsi_addr = %p\n", info->si_addr);
+ printf("\tsi_trap = %d\n", info->si_trap);
+#endif
+
+ va = (vaddr_t) info->si_addr;
+ va = trunc_page(va);
+
+ kmem = 1;
+ vm_map = kernel_map;
+ if ((va >= VM_MIN_ADDRESS) && (va <= VM_MAXUSER_ADDRESS)) {
+ kmem = 0;
+ vm_map = &vm->vm_map;
+ }
+
+ pcb->pcb_onfault = NULL;
+ /* XXX atype?? */
+atype = PROT_WRITE;
+ rv = uvm_fault(vm_map, (vaddr_t) va, atype);
+ pcb->pcb_onfault = (void *) onfault;
+ if (rv) {
+ /* something got wrong */
+ if (kmem) {
+ /* copyin / copyout */
+ if (!onfault)
+ panic("kernel fault");
+
+ /* jump to given onfault */
+ tf = &kernel_tf;
+ memset(tf, 0, sizeof(struct trapframe));
+ tf->tf_pc = onfault;
+ tf->tf_out[0] = (rv == EACCES) ? EFAULT : rv;
+ return;
+ }
+ panic("should deliver a trap to the process");
+ }
+
+ }
+}
+
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