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Kernel: Add ptrace commands for reading/writing the debug registers

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This adds PT_PEEKDEBUG and PT_POKEDEBUG to allow for reading/writing
the debug registers, and updates the Kernel's debug handler to read the
new information from the debug status register.
This commit is contained in:
FalseHonesty 2021-04-15 12:34:51 -04:00 • committed by Andreas Kling
parent 97a4c627cb
commit 3123ffb19d
6 changed files with 79 additions and 5 deletions
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7
Kernel/Arch/i386/CPU.cpp
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@ -363,14 +363,15 @@ void debug_handler(TrapFrame* trap)
PANIC("Debug exception in ring 0");
}
constexpr u8 REASON_SINGLESTEP = 14;
bool is_reason_singlestep = (read_dr6() & (1 << REASON_SINGLESTEP));
if (!is_reason_singlestep)
auto debug_status = read_dr6();
auto should_trap_mask = (1 << REASON_SINGLESTEP) | 0b1111;
if ((debug_status & should_trap_mask) == 0)
return;
if (auto tracer = process.tracer()) {
tracer->set_regs(regs);
}
current_thread->send_urgent_signal_to_self(SIGTRAP);
write_dr6(debug_status & ~(should_trap_mask));
}
EH_ENTRY_NO_CODE(3, breakpoint);