495 lines
17 KiB
C
495 lines
17 KiB
C
// ke_debug.c - debugging utilities
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#include <stdarg.h>
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#include <stdint.h>
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#include <string.h>
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#include <hal_api.h>
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#include <ke_debug.h>
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#include <ke_spinlock.h>
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#include <ke_process.h>
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#include <ke_thread.h>
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#include <ke_sched.h>
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#include <mm_virt.h>
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#include <printf.h>
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int _fltused; // fuckass
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int gDebugEnabled = 0;
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void (*PrintChar)(char, uint32_t, uint32_t);
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void KiKernelPutChar(char c) {
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PrintChar(c, 0x00FF00, 0x000000);
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}
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void KeInitDebug(void (*PrintPtr)(char, uint32_t, uint32_t), int v) {
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gDebugEnabled = v;
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PrintChar = PrintPtr;
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printf_set_putchar(KiKernelPutChar);
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}
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__declspec(dllexport) void DbgPrint(const char* fmt, ...) {
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if (!gDebugEnabled) return;
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static SPINLOCK sl = {0};
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uintptr_t flags = KeAcquireSpinlock(&sl);
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va_list va;
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va_start(va, fmt);
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vprintf(fmt, va);
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va_end(va);
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KeReleaseSpinlock(&sl, flags);
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}
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// KePanic
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__declspec(dllexport) _Noreturn void KePanic(const char* fmt, ...) {
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// Silence! Stop the world!
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_disable();
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// Print a bright-red banner so the framebuffer is unmistakable.
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// We call PrintChar directly so we can set a red foreground.
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// (DbgPrint uses green; we want this visually distinct.)
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static const char banner[] = "\n*** KERNEL PANIC ***\n";
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for (const char* p = banner; *p; p++)
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PrintChar(*p, 0xFF2222, 0x000000);
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// Now print the caller's message through the normal vprintf path.
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va_list va;
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va_start(va, fmt);
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vprintf(fmt, va);
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va_end(va);
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// Die!
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while (true) __halt();
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}
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// KePrintConsole - write user-visible console text in white-on-black.
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// Used by SYS_WRITE_CONSOLE so user programs get a distinct color from
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// kernel debug output (green) and panic output (red).
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__declspec(dllexport) void KePrintConsole(const char* buf, size_t len) {
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if (!buf || !PrintChar) return;
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for (size_t i = 0; i < len; i++)
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PrintChar(buf[i], 0xFFFFFF, 0x000000);
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}
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// ---------------------------------------------------------------------------
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// KeBugCheckProcess - user-mode fault handler
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//
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// Resolves the faulting RIP to a module name, prints a yellow crash banner,
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// kills the offending process, then exits the current thread so the scheduler
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// can continue running everything else.
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// ---------------------------------------------------------------------------
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// Return the short exception name for a CPU exception vector.
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// Keep this table complete for vectors 0..31 so faults never collapse into
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// a vague "general protection" bucket just because the IDT entry existed
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// first or the crash printer lacked a name.
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static const char* KiFaultVectorName(int vector) {
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switch (vector) {
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case 0: return "#DE Divide Error";
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case 1: return "#DB Debug";
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case 2: return "NMI Interrupt";
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case 3: return "#BP Breakpoint";
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case 4: return "#OF Overflow";
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case 5: return "#BR Bound Range Exceeded";
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case 6: return "#UD Invalid Opcode";
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case 7: return "#NM Device Not Available";
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case 8: return "#DF Double Fault";
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case 9: return "Coprocessor Segment Overrun";
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case 10: return "#TS Invalid TSS";
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case 11: return "#NP Segment Not Present";
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case 12: return "#SS Stack-Segment Fault";
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case 13: return "#GP General Protection";
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case 14: return "#PF Page Fault";
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case 15: return "Reserved Exception 15";
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case 16: return "#MF x87 Floating-Point Exception";
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case 17: return "#AC Alignment Check";
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case 18: return "#MC Machine Check";
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case 19: return "#XM SIMD Floating-Point Exception";
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case 20: return "#VE Virtualization Exception";
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case 21: return "#CP Control Protection Exception";
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case 22: return "Reserved Exception 22";
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case 23: return "Reserved Exception 23";
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case 24: return "Reserved Exception 24";
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case 25: return "Reserved Exception 25";
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case 26: return "Reserved Exception 26";
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case 27: return "Reserved Exception 27";
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case 28: return "#HV Hypervisor Injection Exception";
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case 29: return "#VC VMM Communication Exception";
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case 30: return "#SX Security Exception";
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case 31: return "Reserved Exception 31";
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default: return "Unknown Exception";
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}
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}
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static int KiFaultHasErrorCode(int vector) {
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switch (vector) {
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case 8: // #DF
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case 10: // #TS
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case 11: // #NP
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case 12: // #SS
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case 13: // #GP
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case 14: // #PF
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case 17: // #AC
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case 21: // #CP
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case 29: // #VC
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case 30: // #SX
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return 1;
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default:
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return 0;
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}
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}
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// Walk the process module list to find which image owns an address.
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// Returns the module name string, or "unknown" if the address is outside all
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// known image ranges. Base/size are optional and are useful for offset dumps.
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static const char* KiResolveModuleEx(PROCESS* proc, uintptr_t addr,
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uintptr_t* baseOut, size_t* sizeOut) {
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if (baseOut) *baseOut = 0;
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if (sizeOut) *sizeOut = 0;
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if (!proc) return "unknown";
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if (proc->ImageBase && proc->ImageSize &&
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addr >= proc->ImageBase && addr < proc->ImageBase + proc->ImageSize) {
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if (baseOut) *baseOut = proc->ImageBase;
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if (sizeOut) *sizeOut = proc->ImageSize;
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return proc->Name;
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}
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for (uint32_t i = 0; i < proc->ModuleCount; i++) {
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uintptr_t base = proc->Modules[i].Base;
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size_t size = proc->Modules[i].Size;
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if (base && size && addr >= base && addr < base + size) {
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if (baseOut) *baseOut = base;
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if (sizeOut) *sizeOut = size;
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return proc->Modules[i].Name;
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}
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}
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return "unknown";
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}
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static const char* KiResolveModule(PROCESS* proc, uintptr_t addr) {
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return KiResolveModuleEx(proc, addr, (uintptr_t*)0, (size_t*)0);
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}
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static void KiPrintAddress(PROCESS* proc, const char* label, uintptr_t addr) {
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uintptr_t base = 0;
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size_t size = 0;
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const char* mod = KiResolveModuleEx(proc, addr, &base, &size);
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if (base) {
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printf("%s%016llx <%s+0x%llx>\n",
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label,
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(unsigned long long)addr,
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mod,
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(unsigned long long)(addr - base));
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} else {
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printf("%s%016llx <unknown>\n",
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label,
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(unsigned long long)addr);
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}
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}
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static int KiUserReadU64(uintptr_t addr, uint64_t* out) {
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if (!out) return 0;
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if (!addr) return 0;
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if (!KSUCCESS(MmProbeUserRead((const void*)addr, sizeof(uint64_t))))
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return 0;
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*out = *(const uint64_t*)addr;
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return 1;
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}
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static int KiUserReadU8(uintptr_t addr, uint8_t* out) {
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if (!out) return 0;
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if (!addr) return 0;
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if (!KSUCCESS(MmProbeUserRead((const void*)addr, sizeof(uint8_t))))
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return 0;
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*out = *(const uint8_t*)addr;
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return 1;
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}
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static void KiDumpBytes(PROCESS* proc, const char* label, uintptr_t center) {
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if (!center) {
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printf("%s: <null>\n", label);
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return;
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}
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printf("%s around ", label);
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KiPrintAddress(proc, "", center);
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uintptr_t start = center >= 16 ? center - 16 : 0;
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for (int row = 0; row < 2; row++) {
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uintptr_t addr = start + (uintptr_t)row * 16u;
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printf(" %016llx:", (unsigned long long)addr);
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for (int i = 0; i < 16; i++) {
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uint8_t b = 0;
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if (KiUserReadU8(addr + (uintptr_t)i, &b))
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printf(" %02x", b);
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else
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printf(" ??");
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}
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printf("\n");
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}
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}
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static int KiUserReadI32(uintptr_t addr, int32_t* out) {
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if (!out) return 0;
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if (!addr) return 0;
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if (!KSUCCESS(MmProbeUserRead((const void*)addr, sizeof(int32_t))))
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return 0;
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*out = *(const int32_t*)addr;
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return 1;
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}
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static void KiDumpIndirectCallSlot(PROCESS* proc, uintptr_t ret) {
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if (!ret) return;
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// Most x64 import/function-pointer calls are one of:
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// FF 15 disp32 call qword ptr [rip+disp32]
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// 48 FF 15 disp32 rex.w call qword ptr [rip+disp32]
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// The saved return address points immediately after the instruction.
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uintptr_t insn = 0;
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int32_t disp = 0;
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uint8_t b0 = 0, b1 = 0, b2 = 0;
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if (KiUserReadU8(ret - 6, &b0) &&
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KiUserReadU8(ret - 5, &b1) &&
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b0 == 0xff && b1 == 0x15 &&
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KiUserReadI32(ret - 4, &disp)) {
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insn = ret - 6;
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} else if (KiUserReadU8(ret - 7, &b0) &&
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KiUserReadU8(ret - 6, &b1) &&
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KiUserReadU8(ret - 5, &b2) &&
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b0 == 0x48 && b1 == 0xff && b2 == 0x15 &&
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KiUserReadI32(ret - 4, &disp)) {
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insn = ret - 7;
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} else {
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printf("No RIP-relative indirect call pattern found before return address.\n");
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return;
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}
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uintptr_t slot = ret + (intptr_t)disp;
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uint64_t target = 0;
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printf("Decoded null indirect call:\n");
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KiPrintAddress(proc, " insn=", insn);
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KiPrintAddress(proc, " slot=", slot);
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if (KiUserReadU64(slot, &target)) {
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KiPrintAddress(proc, " *slot=", (uintptr_t)target);
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} else {
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printf(" *slot=<unreadable>\n");
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}
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KiDumpBytes(proc, "Bytes near indirect slot", slot);
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}
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static void KiDumpModules(PROCESS* proc) {
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if (!proc) return;
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printf("Images:\n");
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if (proc->ImageBase && proc->ImageSize) {
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printf(" %-31s %016llx-%016llx size=%llx\n",
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proc->Name,
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(unsigned long long)proc->ImageBase,
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(unsigned long long)(proc->ImageBase + proc->ImageSize),
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(unsigned long long)proc->ImageSize);
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}
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for (uint32_t i = 0; i < proc->ModuleCount; i++) {
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uintptr_t base = proc->Modules[i].Base;
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size_t size = proc->Modules[i].Size;
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printf(" %-31s %016llx-%016llx size=%llx\n",
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proc->Modules[i].Name,
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(unsigned long long)base,
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(unsigned long long)(base + size),
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(unsigned long long)size);
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}
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}
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static void KiDumpUserStack(PROCESS* proc, uintptr_t rsp) {
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printf("User stack @ %016llx:\n", (unsigned long long)rsp);
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if (!rsp) {
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printf(" <no user RSP captured>\n");
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return;
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}
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for (int i = 0; i < 12; i++) {
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uintptr_t slot = rsp + (uintptr_t)i * 8u;
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uint64_t value = 0;
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if (KiUserReadU64(slot, &value)) {
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uintptr_t base = 0;
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size_t size = 0;
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const char* mod = KiResolveModuleEx(proc, (uintptr_t)value, &base, &size);
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if (base) {
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printf(" [%02d] %016llx : %016llx <%s+0x%llx>\n",
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i,
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(unsigned long long)slot,
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(unsigned long long)value,
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mod,
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(unsigned long long)((uintptr_t)value - base));
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} else {
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printf(" [%02d] %016llx : %016llx\n",
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i,
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(unsigned long long)slot,
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(unsigned long long)value);
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}
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} else {
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printf(" [%02d] %016llx : <unreadable>\n",
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i,
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(unsigned long long)slot);
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}
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}
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}
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static void KiDumpFaultFrame(PROCESS* proc, const KFAULT_FRAME* f) {
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if (!f) return;
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printf("Regs:\n");
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printf(" RAX=%016llx RBX=%016llx RCX=%016llx RDX=%016llx\n",
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(unsigned long long)f->Rax, (unsigned long long)f->Rbx,
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(unsigned long long)f->Rcx, (unsigned long long)f->Rdx);
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printf(" RSI=%016llx RDI=%016llx RBP=%016llx RSP=%016llx\n",
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(unsigned long long)f->Rsi, (unsigned long long)f->Rdi,
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(unsigned long long)f->Rbp, (unsigned long long)f->Rsp);
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printf(" R8 =%016llx R9 =%016llx R10=%016llx R11=%016llx\n",
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(unsigned long long)f->R8, (unsigned long long)f->R9,
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(unsigned long long)f->R10, (unsigned long long)f->R11);
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printf(" R12=%016llx R13=%016llx R14=%016llx R15=%016llx\n",
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(unsigned long long)f->R12, (unsigned long long)f->R13,
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(unsigned long long)f->R14, (unsigned long long)f->R15);
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printf(" CS=%04llx SS=%04llx RFLAGS=%016llx\n",
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(unsigned long long)f->Cs,
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(unsigned long long)f->Ss,
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(unsigned long long)f->Rflags);
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if (f->Rip == 0) {
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uint64_t ret = 0;
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if (KiUserReadU64((uintptr_t)f->Rsp, &ret)) {
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printf("Likely null indirect call. Return address from [RSP]:\n");
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KiPrintAddress(proc, " ret=", (uintptr_t)ret);
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KiDumpBytes(proc, "Bytes near return address", (uintptr_t)ret);
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KiDumpIndirectCallSlot(proc, (uintptr_t)ret);
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} else {
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printf("Likely null indirect call, but [RSP] is unreadable.\n");
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}
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} else {
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KiDumpBytes(proc, "Bytes near RIP", (uintptr_t)f->Rip);
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}
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KiDumpUserStack(proc, (uintptr_t)f->Rsp);
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}
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static void KiPrintCrashChar(char c) {
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PrintChar(c, 0xFFAA00, 0x000000); // amber - distinct from green debug / red panic
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}
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static void KiPrintCrashHeader(PROCESS* proc, int vector, uintptr_t rip,
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uintptr_t errCode, uintptr_t cr2) {
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const char* faultName = KiFaultVectorName(vector);
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const char* procName = proc ? proc->Name : "unknown";
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uint32_t pid = proc ? proc->ProcessId : 0;
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const char* modName = proc ? KiResolveModule(proc, rip) : "unknown";
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static const char banner[] = "\n*** APPLICATION CRASH ***\n";
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for (const char* p = banner; *p; p++)
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KiPrintCrashChar(*p);
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printf_set_putchar(KiPrintCrashChar);
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if (vector == 14)
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printf("Process: %s (PID %u) | Fault: %s\n"
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"Module: %s | RIP: %016llx | Code: %04llx | CR2: %016llx\n",
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procName, pid, faultName,
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modName,
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(unsigned long long)rip,
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(unsigned long long)errCode,
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(unsigned long long)cr2);
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else
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printf("Process: %s (PID %u) | Fault: %s\n"
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"Module: %s | RIP: %016llx | Code: %04llx\n",
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procName, pid, faultName,
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modName,
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(unsigned long long)rip,
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(unsigned long long)errCode);
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}
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static _Noreturn void KiFinishFaultedProcess(PROCESS* proc, THREAD* thread) {
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printf_set_putchar(KiKernelPutChar);
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if (proc) KeExitProcess(proc, -1);
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if (thread) KeExitThread(thread, -1);
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while (1) __halt();
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}
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_Noreturn void KeBugCheckProcess(int vector, uintptr_t rip, uintptr_t errCode, uintptr_t cr2) {
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THREAD* thread = KeGetCurrentThread();
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PROCESS* proc = thread ? thread->Owner : (PROCESS*)0;
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KiPrintCrashHeader(proc, vector, rip, errCode, cr2);
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KiDumpModules(proc);
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KiFinishFaultedProcess(proc, thread);
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}
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__declspec(dllexport) _Noreturn void KeFaultDispatchFrame(const KFAULT_FRAME* frame) {
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THREAD* thread = KeGetCurrentThread();
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PROCESS* proc = thread ? thread->Owner : (PROCESS*)0;
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if (!frame || frame->Magic != 0x3146544C5541464BULL) {
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KePanic("PANIC: bad KFAULT_FRAME %016llx\n",
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(unsigned long long)(uintptr_t)frame);
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}
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if ((frame->Cs & 3) == 0) {
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int vector = (int)frame->Vector;
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const char* name = KiFaultVectorName(vector);
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if (vector == 14) {
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KePanic("PANIC: %s | RIP: %016llx | Code: %04llx | CR2: %016llx\n",
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name,
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(unsigned long long)frame->Rip,
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(unsigned long long)frame->ErrorCode,
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(unsigned long long)frame->Cr2);
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} else if (KiFaultHasErrorCode(vector)) {
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KePanic("PANIC: %s | RIP: %016llx | Code: %04llx\n",
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name,
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(unsigned long long)frame->Rip,
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(unsigned long long)frame->ErrorCode);
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} else {
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KePanic("PANIC: %s | RIP: %016llx\n",
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name,
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(unsigned long long)frame->Rip);
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}
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}
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KiPrintCrashHeader(proc, (int)frame->Vector,
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(uintptr_t)frame->Rip,
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(uintptr_t)frame->ErrorCode,
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(uintptr_t)frame->Cr2);
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KiDumpFaultFrame(proc, frame);
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KiDumpModules(proc);
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KiFinishFaultedProcess(proc, thread);
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}
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// ---------------------------------------------------------------------------
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// KeFaultDispatch - single C entry point for all three IDT fault stubs.
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//
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// The asm stubs (ke_syscall.asm) collect the CPU exception frame values and
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// call here. We check the CS RPL to decide: kernel fault → KePanic (halt),
|
|
// user fault → KeBugCheckProcess (kill process, resume scheduler).
|
|
// ---------------------------------------------------------------------------
|
|
__declspec(dllexport) _Noreturn void KeFaultDispatch(int vector, uintptr_t rip,
|
|
uintptr_t errCode, uintptr_t cr2,
|
|
uintptr_t cs) {
|
|
KFAULT_FRAME frame;
|
|
memset(&frame, 0, sizeof(frame));
|
|
frame.Magic = 0x3146544C5541464BULL;
|
|
frame.Vector = (uint64_t)vector;
|
|
frame.ErrorCode = errCode;
|
|
frame.Cr2 = cr2;
|
|
frame.Rip = rip;
|
|
frame.Cs = cs;
|
|
KeFaultDispatchFrame(&frame);
|
|
}
|