x86 elf loader implementation (only 2 common types).

depends on a few not-yet-commited files

core/loader/elfloader-x86.c

@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2005, Swedish Institute of Computer Science
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * @(#)$Id: elfloader-x86.c,v 1.1 2006/10/25 10:53:31 fros4943 Exp $
+ */
+#include "elfloader-arch.h"
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <stdio.h>
+
+#define R_386_NONE          0
+#define R_386_32            1
+#define R_386_PC32          2
+#define R_386_GOT32         3
+#define R_386_PLT32         4
+#define R_386_COPY          5
+#define R_386_GLOB_DATA     6
+#define R_386_JMP_SLOT      7
+#define R_386_RELATIVE      8
+#define R_386_GOTOFF        9
+#define R_386_GOTPC         10
+
+#define ELF32_R_TYPE(info)      ((unsigned char)(info))
+
+static char datamemory[ELFLOADER_DATAMEMORY_SIZE];
+
+/*---------------------------------------------------------------------------*/
+void *
+elfloader_arch_allocate_ram(int size)
+{
+  return (void *)datamemory;
+}
+/*---------------------------------------------------------------------------*/
+void *
+elfloader_arch_allocate_rom(int size)
+{
+  int fd = open("/dev/zero", O_RDWR);
+  char *mem = mmap(0, ELFLOADER_TEXTMEMORY_SIZE, PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0);
+  return mem;
+}
+/*---------------------------------------------------------------------------*/
+void
+elfloader_arch_write_text(int fd, unsigned int size, char *mem)
+{
+  cfs_read(fd, (unsigned char *)mem, size);
+}
+/*---------------------------------------------------------------------------*/
+void
+elfloader_arch_relocate(int fd, unsigned int sectionoffset, char *sectionaddress, 
+			struct elf32_rela *rela, char *addr)
+{
+  unsigned int type;
+  
+  /* 
+     Given value addr is S
+     
+     S = runtime address of destination = addr
+     A = rela->r_addend 
+     P = absolute address of relocation (section base address and rela->r_offset)
+  */
+  
+  type = ELF32_R_TYPE(rela->r_info);
+  
+  switch(type) {
+  case R_386_NONE:
+  case R_386_COPY:
+    /* printf("elfloader-x86.c: relocation calculation completed (none) %d\n", type); */
+    break;
+  case R_386_32:
+    addr += rela->r_addend; /* +A */
+    
+    cfs_seek(fd, sectionoffset + rela->r_offset);
+    cfs_write(fd, (char *)&addr, 4);
+    /*printf("elfloader-x86.c: performed relocation type S + A (%d)\n", type);*/
+    break;
+  case R_386_PC32:
+    addr -= (sectionaddress + rela->r_offset); /* -P */
+    addr += rela->r_addend; /* +A */
+    
+    cfs_seek(fd, sectionoffset + rela->r_offset);
+    cfs_write(fd, (char *)&addr, 4);
+    /*printf("elfloader-x86.c: performed relocation type S + A - P (%d)\n", type);*/
+    break;
+  case R_386_GOT32:
+    printf("elfloader-x86.c: unsupported relocation type G + A - P (%d)\n", type);
+    break;
+  case R_386_PLT32:
+    printf("elfloader-x86.c: unsupported relocation type L + A - P (%d)\n", type);
+    break;
+  case R_386_GLOB_DATA:
+  case R_386_JMP_SLOT:
+    printf("elfloader-x86.c: unsupported relocation type S (%d)\n", type);
+    break;
+  case R_386_RELATIVE:
+    printf("elfloader-x86.c: unsupported relocation type B + A (%d)\n", type);
+    break;
+  case R_386_GOTOFF:
+    printf("elfloader-x86.c: unsupported relocation type S + A - GOT (%d)\n", type);
+    break;
+  case R_386_GOTPC:
+    printf("elfloader-x86.c: unsupported relocation type GOT + A - P (%d)\n", type);
+    break;
+  default:
+    printf("elfloader-x86.c: unknown type (%d)\n", type);
+    break;
+  }
+  
+}
+/*---------------------------------------------------------------------------*/