1 files changed, 124 insertions, 0 deletions
diff --git a/src/kernel/elf.h b/src/kernel/elf.h
new file mode 100644
index 0000000..9143401
--- /dev/null
+++ b/src/kernel/elf.h
@@ -0,0 +1,124 @@
+/**
+ * @file elf.h
+ * Functionality to execute ELF files
+ *
+ * Copyright (C) 2018 Clyne Sullivan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef ELF_H_
+#define ELF_H_
+
+#include <stdint.h>
+
+/**
+ * Attempts to open the given ELF file.
+ * @param file Path of the ELF file
+ * @param argv argv to be passed to the program
+ * @param envp envp to be passed to the program
+ * @return -1 on fail, otherwise returns address of ELF entry
+ */
+uint32_t elf_execve(const char *file, char * const argv[], char * const envp[]);
+
+//
+// ELF Standard macros and structures below
+
+#define EI_NIDENT 16
+
+#define PT_NULL     0
+#define PT_LOAD     1
+#define PT_DYNAMIC  2
+#define PT_INTERP   3
+#define PT_NOTE     4
+#define PT_SHLIB    5
+#define PT_PHDR     6
+#define PT_RESERVED 0x70000000
+
+#define ELF32_ST_BIND(i)    ((i) >> 4)
+#define ELF32_ST_TYPE(i)    ((i) & 0xF)
+#define ELF32_ST_INFO(b, t) (((b) << 4) + ((t) & 0xF))
+
+#define ELF32_R_SYM(i)     ((i) >> 8)
+#define ELF32_R_TYPE(i)    ((i) & 0xFF)
+#define ELF32_R_INFO(s, t) (((s) << 8) + ((t) & 0xFF))
+
+typedef uint32_t Elf32_Addr;
+typedef uint16_t Elf32_Half;
+typedef uint32_t Elf32_Off;
+typedef uint32_t Elf32_Sword;
+typedef uint32_t Elf32_Word;
+
+typedef struct {
+	unsigned char e_ident[EI_NIDENT];
+	Elf32_Half    e_type;
+	Elf32_Half    e_machine;
+	Elf32_Word    e_version;
+	Elf32_Addr    e_entry;
+	Elf32_Off     e_phoff;
+	Elf32_Off     e_shoff;
+	Elf32_Word    e_flags;
+	Elf32_Half    e_ehsize;
+	Elf32_Half    e_phentsize;
+	Elf32_Half    e_phnum;
+	Elf32_Half    e_shentsize;
+	Elf32_Half    e_shnum;
+	Elf32_Half    e_shstrndx;
+} __attribute__((packed)) Elf32_Ehdr;
+
+typedef struct {
+	Elf32_Word sh_name;
+	Elf32_Word sh_type;
+	Elf32_Word sh_flags;
+	Elf32_Addr sh_addr;
+	Elf32_Off  sh_offset;
+	Elf32_Word sh_size;
+	Elf32_Word sh_link;
+	Elf32_Word sh_info;
+	Elf32_Word sh_addralign;
+	Elf32_Word sh_entsize;
+} __attribute__((packed)) Elf32_Shdr;
+
+typedef struct {
+	Elf32_Word    st_name;
+	Elf32_Addr    st_value;
+	Elf32_Word    st_size;
+	unsigned char st_info;
+	unsigned char st_other;
+	Elf32_Half    st_shndx;
+} __attribute__((packed)) Elf32_Sym;
+
+typedef struct {
+	Elf32_Addr r_offset;
+	Elf32_Word r_info;
+} __attribute__((packed)) Elf32_Rel;
+
+typedef struct {
+	Elf32_Addr  r_offset;
+	Elf32_Word  r_info;
+	Elf32_Sword r_addend;
+} __attribute__((packed)) Elf32_Rela;
+
+typedef struct {
+	Elf32_Word p_type;
+	Elf32_Off  p_offset;
+	Elf32_Addr p_vaddr;
+	Elf32_Addr p_paddr;
+	Elf32_Word p_filesz;
+	Elf32_Word p_memsz;
+	Elf32_Word p_flags;
+	Elf32_Word p_align;
+} __attribute__((packed)) Elf32_Phdr;
+
+#endif // ELF_H_