src/system/kernel/arch/x86/64/signals.cpp

   1 /*
   2  * Copyright 2012, Alex Smith, alex@alex-smith.me.uk.
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6
   7 #include "x86_signals.h"
   8
   9 #include <string.h>
  10
  11 #include <KernelExport.h>
  12
  13 #include <commpage.h>
  14 #include <cpu.h>
  15 #include <elf.h>
  16 #include <smp.h>
  17
  18
  19 extern "C" void x86_64_user_signal_handler(void);
  20 extern int x86_64_user_signal_handler_end;
  21
  22
  23 void
  24 x86_initialize_commpage_signal_handler()
  25 {
  26         void* handlerCode = (void*)&x86_64_user_signal_handler;
  27         void* handlerCodeEnd = &x86_64_user_signal_handler_end;
  28
  29         // Copy the signal handler code to the commpage.
  30         size_t len = (size_t)((addr_t)handlerCodeEnd - (addr_t)handlerCode);
  31         addr_t position = fill_commpage_entry(COMMPAGE_ENTRY_X86_SIGNAL_HANDLER,
  32                 handlerCode, len);
  33
  34         // Add symbol to the commpage image.
  35         image_id image = get_commpage_image();
  36         elf_add_memory_image_symbol(image, "commpage_signal_handler", position,
  37                 len, B_SYMBOL_TYPE_TEXT);
  38 }
  39