/*
- * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
-#include "linux/kernel.h"
-#include "asm/errno.h"
-#include "linux/sched.h"
-#include "linux/mm.h"
-#include "linux/spinlock.h"
-#include "linux/init.h"
-#include "linux/ptrace.h"
-#include "asm/semaphore.h"
-#include "asm/pgtable.h"
-#include "asm/pgalloc.h"
-#include "asm/tlbflush.h"
-#include "asm/a.out.h"
-#include "asm/current.h"
-#include "asm/irq.h"
-#include "sysdep/sigcontext.h"
-#include "kern_util.h"
-#include "as-layout.h"
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/hardirq.h>
+#include <asm/current.h>
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
#include "arch.h"
-#include "kern.h"
-#include "chan_kern.h"
-#include "mconsole_kern.h"
-#include "mem.h"
-#include "mem_kern.h"
-#include "sysdep/sigcontext.h"
-#include "sysdep/ptrace.h"
+#include "as-layout.h"
+#include "kern_util.h"
#include "os.h"
-#ifdef CONFIG_MODE_SKAS
#include "skas.h"
-#endif
-#include "os.h"
+#include "sysdep/sigcontext.h"
-/* Note this is constrained to return 0, -EFAULT, -EACCESS, -ENOMEM by segv(). */
+/*
+ * Note this is constrained to return 0, -EFAULT, -EACCESS, -ENOMEM by
+ * segv().
+ */
int handle_page_fault(unsigned long address, unsigned long ip,
int is_write, int is_user, int *code_out)
{
*code_out = SEGV_MAPERR;
- /* If the fault was during atomic operation, don't take the fault, just
- * fail. */
+ /*
+ * If the fault was during atomic operation, don't take the fault, just
+ * fail.
+ */
if (in_atomic())
goto out_nosemaphore;
down_read(&mm->mmap_sem);
vma = find_vma(mm, address);
- if(!vma)
+ if (!vma)
goto out;
- else if(vma->vm_start <= address)
+ else if (vma->vm_start <= address)
goto good_area;
- else if(!(vma->vm_flags & VM_GROWSDOWN))
+ else if (!(vma->vm_flags & VM_GROWSDOWN))
goto out;
- else if(is_user && !ARCH_IS_STACKGROW(address))
+ else if (is_user && !ARCH_IS_STACKGROW(address))
goto out;
- else if(expand_stack(vma, address))
+ else if (expand_stack(vma, address))
goto out;
good_area:
*code_out = SEGV_ACCERR;
- if(is_write && !(vma->vm_flags & VM_WRITE))
+ if (is_write && !(vma->vm_flags & VM_WRITE))
goto out;
/* Don't require VM_READ|VM_EXEC for write faults! */
- if(!is_write && !(vma->vm_flags & (VM_READ | VM_EXEC)))
+ if (!is_write && !(vma->vm_flags & (VM_READ | VM_EXEC)))
goto out;
do {
int fault;
-survive:
+
fault = handle_mm_fault(mm, vma, address, is_write);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM) {
- err = -ENOMEM;
goto out_of_memory;
} else if (fault & VM_FAULT_SIGBUS) {
err = -EACCES;
pud = pud_offset(pgd, address);
pmd = pmd_offset(pud, address);
pte = pte_offset_kernel(pmd, address);
- } while(!pte_present(*pte));
+ } while (!pte_present(*pte));
err = 0;
- /* The below warning was added in place of
+ /*
+ * The below warning was added in place of
* pte_mkyoung(); if (is_write) pte_mkdirty();
* If it's triggered, we'd see normally a hang here (a clean pte is
* marked read-only to emulate the dirty bit).
out:
up_read(&mm->mmap_sem);
out_nosemaphore:
- return(err);
+ return err;
-/*
- * We ran out of memory, or some other thing happened to us that made
- * us unable to handle the page fault gracefully.
- */
out_of_memory:
- if (is_init(current)) {
- up_read(&mm->mmap_sem);
- yield();
- down_read(&mm->mmap_sem);
- goto survive;
- }
- goto out;
+ /*
+ * We ran out of memory, call the OOM killer, and return the userspace
+ * (which will retry the fault, or kill us if we got oom-killed).
+ */
+ up_read(&mm->mmap_sem);
+ pagefault_out_of_memory();
+ return 0;
}
static void bad_segv(struct faultinfo fi, unsigned long ip)
force_sig_info(SIGSEGV, &si, current);
}
-static void segv_handler(int sig, union uml_pt_regs *regs)
+void fatal_sigsegv(void)
+{
+ force_sigsegv(SIGSEGV, current);
+ do_signal();
+ /*
+ * This is to tell gcc that we're not returning - do_signal
+ * can, in general, return, but in this case, it's not, since
+ * we just got a fatal SIGSEGV queued.
+ */
+ os_dump_core();
+}
+
+void segv_handler(int sig, struct uml_pt_regs *regs)
{
struct faultinfo * fi = UPT_FAULTINFO(regs);
- if(UPT_IS_USER(regs) && !SEGV_IS_FIXABLE(fi)){
+ if (UPT_IS_USER(regs) && !SEGV_IS_FIXABLE(fi)) {
bad_segv(*fi, UPT_IP(regs));
return;
}
* give us bad data!
*/
unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
- union uml_pt_regs *regs)
+ struct uml_pt_regs *regs)
{
struct siginfo si;
- void *catcher;
+ jmp_buf *catcher;
int err;
int is_write = FAULT_WRITE(fi);
unsigned long address = FAULT_ADDRESS(fi);
- if(!is_user && (address >= start_vm) && (address < end_vm)){
+ if (!is_user && (address >= start_vm) && (address < end_vm)) {
flush_tlb_kernel_vm();
return 0;
}
- else if(current->mm == NULL) {
+ else if (current->mm == NULL) {
show_regs(container_of(regs, struct pt_regs, regs));
- panic("Segfault with no mm");
+ panic("Segfault with no mm");
}
if (SEGV_IS_FIXABLE(&fi) || SEGV_MAYBE_FIXABLE(&fi))
- err = handle_page_fault(address, ip, is_write, is_user, &si.si_code);
+ err = handle_page_fault(address, ip, is_write, is_user,
+ &si.si_code);
else {
err = -EFAULT;
- /* A thread accessed NULL, we get a fault, but CR2 is invalid.
- * This code is used in __do_copy_from_user() of TT mode. */
+ /*
+ * A thread accessed NULL, we get a fault, but CR2 is invalid.
+ * This code is used in __do_copy_from_user() of TT mode.
+ * XXX tt mode is gone, so maybe this isn't needed any more
+ */
address = 0;
}
catcher = current->thread.fault_catcher;
- if(!err)
+ if (!err)
return 0;
- else if(catcher != NULL){
+ else if (catcher != NULL) {
current->thread.fault_addr = (void *) address;
- do_longjmp(catcher, 1);
+ UML_LONGJMP(catcher, 1);
}
- else if(current->thread.fault_addr != NULL)
+ else if (current->thread.fault_addr != NULL)
panic("fault_addr set but no fault catcher");
- else if(!is_user && arch_fixup(ip, regs))
+ else if (!is_user && arch_fixup(ip, regs))
return 0;
- if(!is_user) {
+ if (!is_user) {
show_regs(container_of(regs, struct pt_regs, regs));
panic("Kernel mode fault at addr 0x%lx, ip 0x%lx",
address, ip);
si.si_addr = (void __user *)address;
current->thread.arch.faultinfo = fi;
force_sig_info(SIGBUS, &si, current);
- } else if (err == -ENOMEM) {
- printk("VM: killing process %s\n", current->comm);
- do_exit(SIGKILL);
} else {
BUG_ON(err != -EFAULT);
si.si_signo = SIGSEGV;
return 0;
}
-void relay_signal(int sig, union uml_pt_regs *regs)
+void relay_signal(int sig, struct uml_pt_regs *regs)
{
- if(arch_handle_signal(sig, regs))
- return;
-
- if(!UPT_IS_USER(regs)){
- if(sig == SIGBUS)
- printk("Bus error - the host /dev/shm or /tmp mount "
- "likely just ran out of space\n");
+ if (!UPT_IS_USER(regs)) {
+ if (sig == SIGBUS)
+ printk(KERN_ERR "Bus error - the host /dev/shm or /tmp "
+ "mount likely just ran out of space\n");
panic("Kernel mode signal %d", sig);
}
+ arch_examine_signal(sig, regs);
+
current->thread.arch.faultinfo = *UPT_FAULTINFO(regs);
force_sig(sig, current);
}
-static void bus_handler(int sig, union uml_pt_regs *regs)
+void bus_handler(int sig, struct uml_pt_regs *regs)
{
- if(current->thread.fault_catcher != NULL)
- do_longjmp(current->thread.fault_catcher, 1);
+ if (current->thread.fault_catcher != NULL)
+ UML_LONGJMP(current->thread.fault_catcher, 1);
else relay_signal(sig, regs);
}
-static void winch(int sig, union uml_pt_regs *regs)
+void winch(int sig, struct uml_pt_regs *regs)
{
do_IRQ(WINCH_IRQ, regs);
}
-const struct kern_handlers handlinfo_kern = {
- .relay_signal = relay_signal,
- .winch = winch,
- .bus_handler = bus_handler,
- .page_fault = segv_handler,
- .sigio_handler = sigio_handler,
- .timer_handler = timer_handler
-};
-
void trap_init(void)
{
}
git.openpandora.org / pandora-kernel.git / blobdiff