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Fixed the detection of page faults that happen while interrupts were

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disabled. If a page fault happend while a interrupt handler is executed,
or while a section of code is running with interrupts disabled (with the
exception of the initial kernel startup), the page fault handler will
now panic, to give you the chance to fix the bug.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2124 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
beveloper
2002-11-30 02:01:29 +00:00
parent f7052c0ec3
commit c0d31b20ab
1 changed files with 6 additions and 6 deletions
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src/kernel/core/arch/x86/arch_int.c
+6 -6
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@@ -185,13 +185,13 @@ i386_handle_trap(struct iframe frame)
asm("movl %%cr2, %0" : "=r" (cr2));
// get the old interrupt enable/disable state and restore to that
if (frame.flags & 0x200) {
dprintf("page_fault: enabling interrupts\n");
if (!kernel_startup)
dprintf("page_fault, but interrupts are disabled. touching address %p from eip %p\n", (void *)cr2, (void *)frame.eip);
enable_interrupts();
// if the interrupts were disabled, and we are not running the kernel startup
// the page fault was not allowed to happen and we must panic
if (0 == (frame.flags & 0x200) && !kernel_startup) {
panic("page_fault, but interrupts were disabled. Touching address %p from eip %p\n", (void *)cr2, (void *)frame.eip);
}
enable_interrupts();
ret = vm_page_fault(cr2, frame.eip,
(frame.error_code & 0x2) != 0,
(frame.error_code & 0x4) != 0,