com32/samples/entrydump.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2004-2008 H. Peter Anvin - All Rights Reserved
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
   8  *   Boston MA 02111-1307, USA; either version 2 of the License, or
   9  *   (at your option) any later version; incorporated herein by reference.
  10  *
  11  * ----------------------------------------------------------------------- */
  12
  13 /*
  14  * entry.c
  15  *
  16  * Dump the entry point registers
  17  */
  18
  19 #include <string.h>
  20 #include <stdio.h>
  21 #include <inttypes.h>
  22 #include <console.h>
  23 #include <syslinux/config.h>
  24
  25 struct stack_frame {
  26     uint16_t gs, fs, es, ds;
  27     uint32_t edi, esi, ebp, esp;
  28     uint32_t ebx, edx, ecx, eax;
  29     uint32_t eflags;
  30     uint16_t ret_ip, ret_cs;
  31     uint16_t pxe_ip, pxe_cs;
  32 };
  33
  34 int main(void)
  35 {
  36     const union syslinux_derivative_info *di;
  37     const struct stack_frame *sf;
  38
  39 #if 0
  40         /* this hangs! */
  41     openconsole(&dev_null_r, &dev_stdcon_w);
  42 #else
  43         /* this works */
  44     openconsole(&dev_rawcon_r, &dev_ansiserial_w);
  45 #endif
  46
  47     di = syslinux_derivative_info();
  48
  49     if (di->c.filesystem != SYSLINUX_FS_PXELINUX) {
  50         printf("Not running under PXELINUX (fs = %02x)\n", di->c.filesystem);
  51         return 1;
  52     }
  53
  54     sf = (const struct stack_frame *)di->pxe.stack;
  55
  56     printf("EAX: %08x  EBX: %08x  ECX: %08x  EDX: %08x\n"
  57            "ESP: %08x  EBP: %08x  ESI: %08x  EDI: %08x\n"
  58            "SS: %04x   DS: %04x   ES: %04x   FS: %04x   GS:  %04x\n"
  59            "EFLAGS: %08x   RET: %04x:%04x   PXE: %04x:%04x\n",
  60            sf->eax, sf->ebx, sf->ecx, sf->edx,
  61            sf->esp + 4, sf->ebp, sf->esi, sf->edi,
  62            di->rr.r.fs, sf->ds, sf->es, sf->fs, sf->gs,
  63            sf->eflags, sf->ret_cs, sf->ret_ip, sf->pxe_cs, sf->pxe_ip);
  64
  65     return 0;
  66 }