kmod: prepare for kernel module loading

README.md

@@ -9,9 +9,12 @@ The Soaplin kernel is a new Unix-like operating system kernel.
 * ELF loader
 * ACPI
 * Symetric Multiprocessing (It runs code, but the scheduler is running on 1 processor.)
+* Recovers from a faulty userspace process.
+
+## Nearly done
+* Virtual File System
 
 ## In the works
-* Virtual File System
 * FPU support
 
 ## To come
@@ -21,9 +24,6 @@ The Soaplin kernel is a new Unix-like operating system kernel.
 * TAR-based init ram disk
 * Video driver for Bochs graphics adapter, and the VMware display adapter.
 
-## Known bugs
-* If a user process calls the syscall handler by using interrupts, the system may crash due to a Page Fault.
-
 ## Building
 To build Soaplin, you must ensure you have these:
 * The Netwide Assembler (nasm)

kernel/linker-x86_64.ld

@@ -57,6 +57,11 @@ SECTIONS
     .data : {
         data_start_ld = .;
         *(.data .data.*)
+        
+        /* Exported kernel symbols */
+        __start_ksyms = .;
+        KEEP(*(.ksyms))
+        __stop_ksyms = .;
     } :data
 
     /* NOTE: .bss needs to be the last thing mapped to :data, otherwise lots of */

kernel/src/dbg/export.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <stdint.h>
+
+// At Soaplin, we aren't doing module racism based on the license. (Ḭ̸̡̢̨̧̨̛͍͚̙̺̦̩͕̮̙̙̳̮͉̝̙̜͓̪͇̠̪̣̻̰͕̲̲̘̖̦͖͕͎̲̹͖̮̳̻̞̌͋̋̆͛̉͆ ̸̨͕͎̣̥͖͔̳̫̳͚̯̬̙̘͓̹̼̻̼̈̓̉ͅͅs̶̟͉̠̣̞͎͍̘̟̝̱̩̃͛̽͛̆͌̆̒̔̈́̎̿̐̈́͐̓̓͒͌̈̀̓͗̋̕͜͜͝͠͝͠ͅȩ̸̡̛͔̦̲̦̼̹̙̲͖͎̼̝̯̦̞̜͍̀̈́̈́͂̈́̍́̆̆̔͗́̆̀͑̀̔͆̄͐͐̆͠ę̸̨̢̢̧̛̛͕̱̯̲̦͕͖̦̝̯̮̤̫͙͔̲̬̯̗̗͈̬̳̙͙̼͉̩͚̼̮͚̖̰̗̤͓̘͂̾̒͋̀͂̏́̂̋̅̆̋̈̔̈́̀̔̈́̊̓͂͌̋̂́̍̀͒͊͊̓͌̃̚͘͜͝͠ ̸̧̡̧͍̼̹͇̞̘͇̯̞̣̝̲̳̦̟̱͇̥͈̟̝̹̳̫͕̜̬̥̯̬̟̤̖̹̙̩̰̈͗͆͌̊̽̾͝͝ͅy̵̡̡̢̞̭͔̰͔͔̖̥͕̙̳̯͍͉̦̦͓̥̞̝͖͕̰̼͖̲̮͚̲̜̰̱̘̯̤̌́̏̄̏́̈́̓ͅỡ̵̢̢̢̖̠͉̖̺̻̣̜̬̮͓̫͎͖͎̤̪̝̗̰͕͍͖̖̟͙͍̻̑͊̃̃̒̍̆̎̋̿͐̋̉̇̾͆̿̌̃̏̽̊̀͒̇̏̓̾̏̈́̓̿̏̚͠͝͝͝ͅu̸̧͕̟͉͉͖̰̝͕̞̪̖͙͙̅̒̅̂̑́,̶̢̡̡̧̛̲̬̞̘̻̗̩̫̗͓̪̬͚̗̖͕̰̣͙͍̯͇̩̭͎̖̝̬̻͖̟̩̙̩̝͓̤́̄̆̍̂̈̊̄͆̽̑̑̊̓̋͐̔̉̍͌̏̀̿͘͜͜͜ͅͅ ̴̢̛̛͈͚̳̣̮̬̲̲͈̮͓̭̗̈́̽̄͌̾̒́̔̌̐̽͋̓̄̉̆̑̃́̏̉̔̓̂̽̊͆̽̎̍̈͑́̌͑̍̕͘͘͝͠ͅL̵̙̯̦̬̱͍̣̹̱̝̓̒i̵̢̨̨̧̨̛̗̲͍͇̖̥̯͔̙̪̱͓̝̦̼̭̬̟̞̩̭͙̐̐͊̒͑̊͌̽̂̉͊̈́̌͒̆̐͐͒̉̀́̑́̅͛͐̕̕͝͝ͅͅņ̵̛͓̲͆̏̃̊̒̇̑̑̾̽͊̃͌̔́̌̈́̈́͛͆̒̀̿̎͒̑̃̈́̈́͂͐͂̕̚̕͘͜͠͠ư̸̧̯̤̲͚͖̯͖͈̠̽̏̈́̄̀͒̐̅̽̋̓̂̑̋̽͒̄̑̇̈́̆̈͛͆̿̈̉͆͗͊̎͂̇̽̋̅͊̀̚̚͝ś̶̛̗̥͇̖̠͓͆̀̅̓̓͆͆̐́̄͛̃͑̔̑̒͒͋͂̂́͋͂́͗̐͆̐̕͝͝͠)
+
+typedef struct {
+    const char* name;
+    uint64_t addr;
+    uint64_t size;
+} kernel_symbol_t;
+
+#define EXPORT_SYMBOL(sym) \
+    static const kernel_symbol_t __ksym_##sym \
+    __attribute__((section(".ksyms"), used)) = { \
+        .name = #sym, \
+        .addr = (uint64_t)&sym, \
+        .size = sizeof(sym) \
+    }
+
+extern const kernel_symbol_t __start_ksyms[];
+extern const kernel_symbol_t __stop_ksyms[];