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Log CPU state on page fault #140

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Merged
DrDeano merged 1 commit into from
May 6, 2020
Merged

Log CPU state on page fault #140

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20 changes: 19 additions & 1 deletion src/kernel/arch/x86/paging.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -358,12 +358,30 @@ pub fn unmap(virtual_start: usize, virtual_end: usize, dir: *Directory) (std.mem
}

///
/// Called when a page fault occurs.
/// Called when a page fault occurs. This will log the CPU state and control registers.
///
/// Arguments:
/// IN state: *arch.InterruptContext - The CPU's state when the fault occurred.
///
fn pageFault(state: *arch.InterruptContext) void {
log.logInfo("State: {X}\n", .{state});
var cr0: u32 = 0;
var cr2: u32 = 0;
var cr3: u32 = 0;
var cr4: u32 = 0;
asm volatile ("mov %%cr0, %[cr0]"
: [cr0] "=r" (cr0)
);
asm volatile ("mov %%cr2, %[cr2]"
: [cr2] "=r" (cr2)
);
asm volatile ("mov %%cr3, %[cr3]"
: [cr3] "=r" (cr3)
);
asm volatile ("mov %%cr4, %[cr4]"
: [cr4] "=r" (cr4)
);
log.logInfo("CR0: {X}, CR2: {X}, CR3: {X}, CR4: {X}\n\n", .{ cr0, cr2, cr3, cr4 });
@panic("Page fault");
}

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