From ace65b453151845bc361f21f3e5b651c35f9f126 Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Wed, 22 May 2024 13:00:41 -0400
Subject: massive refactor for mp and organization

---
 arch/x86_64/elf_load.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 arch/x86_64/elf_load.c

(limited to 'arch/x86_64/elf_load.c')

diff --git a/arch/x86_64/elf_load.c b/arch/x86_64/elf_load.c
new file mode 100644
index 0000000..d7d1b29
--- /dev/null
+++ b/arch/x86_64/elf_load.c
@@ -0,0 +1,58 @@
+#include "arch/elf.h"
+#include "string.h"
+#include "memory.h"
+#include "print.h"
+
+uintptr_t
+elf_load(const void *data, size_t len)
+{
+    if(data == NULL) return 0;
+    if(len < 4) return 0;
+
+    elf_header_t *ehdr = (elf_header_t*)data;
+    if(ehdr->ei_mag[0] != EI_MAG0 ||
+       ehdr->ei_mag[1] != EI_MAG1 ||
+       ehdr->ei_mag[2] != EI_MAG2 ||
+       ehdr->ei_mag[3] != EI_MAG3) return 0;
+
+    if(ehdr->ei_class != EI_CLASS_64) {
+        kerrf("Jove does not support ELF files of class CLASS32\n");
+        return 0;
+    }
+
+    if(ehdr->e_type != ET_EXEC) {
+        kerrf("Jove does not support ELF files other than ET_EXEC\n");
+        return 0;
+    }
+
+    uint64_t entry = ehdr->e_entry;
+    
+    size_t phdrc = ehdr->e_phnum;
+    elf_phdr_t *phdrs = (elf_phdr_t*)((uintptr_t)data + ehdr->e_phoff);
+    
+    for(size_t phdri = 0; phdri < phdrc; phdri++)
+    {
+        elf_phdr_t *phdr = &phdrs[phdri];
+        void *pdata = (void*)phdr->p_vaddr;
+            
+        vm_ensure(
+                phdr->p_vaddr,
+                phdr->p_vaddr + phdr->p_memsz, 
+                (page_flags_t) {
+                    .present = true,
+                    .writeable = true,
+                    .useraccess = true,
+                    .executable = true
+                });
+
+        if(phdr->p_type == PT_LOAD)
+        {
+            kdbgf("PT_LOAD %#016X [%#016X] -> %#016X\n",
+                    (uintptr_t)data + phdr->p_offset,
+                    phdr->p_filesz,
+                    pdata);
+            memcpy(pdata, (void*)((uintptr_t)data + phdr->p_offset), phdr->p_filesz);
+        }
+    }
+    return entry;
+}
-- 
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