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Kernel: Add debug register handling

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This patch adds functions to read/write from the debug registers,
and implements storing/loading them across context switches.
This commit is contained in:
FalseHonesty 2021-04-15 12:29:00 -04:00 • committed by Andreas Kling
parent c84107a1ab
commit 97a4c627cb
3 changed files with 97 additions and 11 deletions
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23
Kernel/Arch/x86/CPU.h
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@ -430,6 +430,15 @@ struct [[gnu::packed]] RegisterState {
FlatPtr userspace_ss;
};
struct [[gnu::packed]] DebugRegisterState {
FlatPtr dr0;
FlatPtr dr1;
FlatPtr dr2;
FlatPtr dr3;
FlatPtr dr6;
FlatPtr dr7;
};
#if ARCH(I386)
# define REGISTER_STATE_SIZE (19 * 4)
#else
@ -476,7 +485,21 @@ void write_cr3(FlatPtr);
void write_cr4(FlatPtr);
void write_xcr0(u64);
void read_debug_registers_into(DebugRegisterState&);
void write_debug_registers_from(const DebugRegisterState&);
void clear_debug_registers();
FlatPtr read_dr0();
void write_dr0(FlatPtr);
FlatPtr read_dr1();
void write_dr1(FlatPtr);
FlatPtr read_dr2();
void write_dr2(FlatPtr);
FlatPtr read_dr3();
void write_dr3(FlatPtr);
FlatPtr read_dr6();
void write_dr6(FlatPtr);
FlatPtr read_dr7();
void write_dr7(FlatPtr);
static inline bool is_kernel_mode()
{