337b8bb36b
While waiting for the main panicing CPU to finish, don't spin the CPU
without using `asm("pause")` to lower power consumption. Some panics can
get stuck in this state and oh man do my fans spin up.
75 lines
1.9 KiB
C++
75 lines
1.9 KiB
C++
#include <util/new.h>
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#include <util/no_construct.h>
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#include "cpu.h"
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#include "display.h"
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#include "io.h"
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#include "serial.h"
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#include "symbol_table.h"
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struct cpu_state;
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bool main_cpu_done = false;
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bool asserting_locked = false;
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unsigned remaining = 0;
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util::no_construct<panicking::serial_port> __com1_storage;
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panicking::serial_port &com1 = __com1_storage.value;
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util::no_construct<panicking::symbol_table> __syms_storage;
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panicking::symbol_table &syms = __syms_storage.value;
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static constexpr int order = __ATOMIC_ACQ_REL;
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extern "C"
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void panic_handler(const cpu_state *regs)
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{
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cpu_data &cpu = current_cpu();
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panic_data *panic = cpu.panic;
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// If we're not running on the CPU that panicked, wait
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// for it to finish
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if (!panic) {
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while (!main_cpu_done) asm ("pause");
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} else {
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new (&com1) panicking::serial_port {panicking::COM1};
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new (&syms) panicking::symbol_table {panic->symbol_data};
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remaining = panic->cpus;
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}
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while (__atomic_test_and_set(&asserting_locked, order))
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asm ("pause");
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panicking::frame const *fp = nullptr;
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asm ( "movq (%%rbp), %0" : "=r" (fp) );
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if (panic)
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print_header(com1, panic->message, panic->function,
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panic->file, panic->line);
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print_cpu(com1, cpu);
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print_callstack(com1, syms, fp);
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print_cpu_state(com1, *regs);
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if (panic && panic->user_state)
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print_user_state(com1, *panic->user_state);
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__atomic_clear(&asserting_locked, order);
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// If we're running on the CPU that panicked, tell the
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// others we have finished
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main_cpu_done = true;
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if (__atomic_sub_fetch(&remaining, 1, order) == 0) {
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// No remaining CPUs, if we're running on QEMU,
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// tell it to exit
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constexpr uint32_t exit_code = 255;
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asm ( "outl %%eax, %%dx" :: "a"(exit_code), "d"(0xf4) );
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}
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while (1) asm ("hlt");
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}
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#define NDEBUG
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#include "../cpprt.cpp"
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