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Merge pull request #140 from SamTebbs33/feature/log-cpu-state-on-page-fault

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Log CPU state on page fault
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Edward Dean 2020-05-06 23:07:20 +01:00 committed by GitHub
commit dac57fc87b
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1 changed files with 19 additions and 1 deletions
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20
src/kernel/arch/x86/paging.zig
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@ -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: /// Arguments:
/// IN state: *arch.InterruptContext - The CPU's state when the fault occurred. /// IN state: *arch.InterruptContext - The CPU's state when the fault occurred.
/// ///
fn pageFault(state: *arch.InterruptContext) void { 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"); @panic("Page fault");
} }