1 files changed, 79 insertions, 0 deletions
diff --git a/kernel.soso/elf.c b/kernel.soso/elf.c
new file mode 100644
index 00000000..7c74d50c
--- /dev/null
+++ b/kernel.soso/elf.c
@@ -0,0 +1,79 @@
+#include "elf.h"
+#include "common.h"
+#include "process.h"
+#include "screen.h"
+
+BOOL isElf(char *elfData)
+{
+    Elf32_Ehdr *hdr = (Elf32_Ehdr *) elfData;
+
+    if (hdr->e_ident[0] == 0x7f && hdr->e_ident[1] == 'E' &&
+        hdr->e_ident[2] == 'L' && hdr->e_ident[3] == 'F')
+    {
+        return TRUE;
+    }
+
+    return FALSE;
+}
+
+uint32 loadElf(char *elfData)
+{
+    uint32 v_begin, v_end;
+    Elf32_Ehdr *hdr;
+    Elf32_Phdr *p_entry;
+    Elf32_Scdr *s_entry;
+
+    hdr = (Elf32_Ehdr *) elfData;
+    p_entry = (Elf32_Phdr *) (elfData + hdr->e_phoff);
+
+    s_entry = (Elf32_Scdr*) (elfData + hdr->e_shoff);
+
+    if (isElf(elfData)==FALSE)
+    {
+        return 0;
+    }
+
+    for (int pe = 0; pe < hdr->e_phnum; pe++, p_entry++)
+    {
+        //Read each entry
+        printkf("loading p_entry %d\n", pe);
+
+        if (p_entry->p_type == PT_LOAD)
+        {
+            v_begin = p_entry->p_vaddr;
+            v_end = p_entry->p_vaddr + p_entry->p_memsz;
+            printkf("p_entry: %x\n", v_begin);
+            if (v_begin < USER_OFFSET)
+            {
+                printkf("INFO: loadElf(): can't load executable below %x\n", USER_OFFSET);
+                return 0;
+            }
+
+            if (v_end > USER_STACK)
+            {
+                printkf("INFO: loadElf(): can't load executable above %x\n", USER_STACK);
+                return 0;
+            }
+
+            //printkf("ELF: entry flags: %x (%d)\n", p_entry->p_flags, p_entry->p_flags);
+
+
+            printkf("about to memcpy\n");
+            memcpy((uint8 *) v_begin, (uint8 *) (elfData + p_entry->p_offset), p_entry->p_filesz);
+            printkf("done with memcpy\n");
+            if (p_entry->p_memsz > p_entry->p_filesz)
+            {
+                char* p = (char *) p_entry->p_vaddr;
+                for (int i = p_entry->p_filesz; i < (int)(p_entry->p_memsz); i++)
+                {
+                    p[i] = 0;
+                }
+            }
+        }
+    }
+
+    //entry point
+    printkf("done loading ELF\n");
+    return hdr->e_entry;
+}
+