elf: start writing elf loader
This commit is contained in:
RaphProductions
parent
175805604e
commit
a6f371b4ad
12 changed files with 4706 additions and 72 deletions
43
kernel/src/exec/elf.c
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43
kernel/src/exec/elf.c
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@ -0,0 +1,43 @@
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#include <exec/elf.h>
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#include <stdint.h>
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#include <sys/log.h>
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void elf_load(char *data) {
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Elf64_Ehdr *ehdr = (Elf64_Ehdr*)data;
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if ( ehdr->e_ident[EI_MAG0] != ELFMAG0
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|| ehdr->e_ident[EI_MAG1] != ELFMAG1
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|| ehdr->e_ident[EI_MAG2] != ELFMAG2
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|| ehdr->e_ident[EI_MAG3] != ELFMAG3)
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{
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log("elf - loading failed: magic is incorrect\n");
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return;
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}
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log("elf - e_ident[EI_DATA]: %d\n", ehdr->e_ident[EI_DATA]);
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log("elf - e_ident[EI_CLASS]: %d\n", ehdr->e_ident[EI_CLASS]);
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log("elf - e_ident[EI_OSABI]: %d\n", ehdr->e_ident[EI_OSABI]);
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log("elf - e_machine: %d\n", ehdr->e_machine);
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log("elf - e_entry: %p\n", ehdr->e_entry);
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log("elf - e_type: %p\n", ehdr->e_type);
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if ( ehdr->e_ident[EI_CLASS] != ELFCLASS64
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|| ehdr->e_machine != EM_X86_64)
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{
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log("elf - loading failed: is the file built for amd64?\n");
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return;
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}
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if (ehdr->e_type != ET_EXEC)
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{
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log("elf - loading failed: ELF type isn't ET_EXEC\n");
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return;
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}
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Elf64_Phdr *phdr = (Elf64_Phdr*)data + ehdr->e_phoff;
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for (uint16_t i = 0; i < ehdr->e_phnum; i++) {
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if (phdr[i].p_type != PT_LOAD)
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continue;
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log("elf - Loadable program header: vaddr: %p", phdr[i].p_vaddr);
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}
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}
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118
kernel/src/exec/elf.h
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118
kernel/src/exec/elf.h
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@ -0,0 +1,118 @@
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#pragma once
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#include <stdint.h>
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// ELF magic.
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#define EI_MAG0 0
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#define ELFMAG0 0x7f
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#define EI_MAG1 1
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#define ELFMAG1 'E'
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#define EI_MAG2 2
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#define ELFMAG2 'L'
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#define EI_MAG3 3
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#define ELFMAG3 'F'
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// ELF class
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#define EI_CLASS 4
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#define ELFCLASSNONE 0
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#define ELFCLASS32 1
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#define ELFCLASS64 2
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// Is processor-specific data little-endian or big-endian?
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#define EI_DATA 5
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#define ELFDATANONE 0
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#define ELFDATA2LSB 1
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#define ELFDATA2MSB 2
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// ELF version
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#define EI_VERSION 6
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#define EV_NONE 0
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#define EV_CURRENT 1
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// ELF ABI
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#define EI_OSABI 7
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#define ELFOSABI_NONE 0
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#define ELFOSABI_SYSV 0
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#define ELFOSABI_HPUX 1
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#define ELFOSABI_NETBSD 2
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#define ELFOSABI_LINUX 3
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#define ELFOSABI_SOLARIS 6
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#define ELFOSABI_IRIX 8
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#define ELFOSABI_FREEBSD 9
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#define ELFOSABI_TRU64 10
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#define ELFOSABI_ARM 97
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#define ELFOSABI_STANDALONE 255
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// ABI version
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#define EI_ABIVERSION 8
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// Unused bytes.
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#define EI_PAD 9
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// Magic size.
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#define EI_NIDENT 16
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// e_type
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#define ET_NONE 0
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#define ET_REL 1
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#define ET_EXEC 2
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#define ET_DYN 3
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#define ET_CORE 4
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// e_machine (we only included machines supported by Soaplin.)
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#define EM_X86_64 62
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typedef uint64_t Elf64_Addr;
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typedef uint64_t Elf64_Off;
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typedef uint16_t Elf64_Section;
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typedef uint16_t Elf64_Versym;
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typedef uint8_t Elf_Byte;
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typedef uint16_t Elf64_Half;
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typedef int32_t Elf64_Sword;
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typedef uint32_t Elf64_Word;
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typedef int64_t Elf64_Sxword;
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typedef uint64_t Elf64_Xword;
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typedef struct {
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unsigned char e_ident[EI_NIDENT];
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uint16_t e_type;
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uint16_t e_machine;
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uint32_t e_version;
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Elf64_Addr e_entry;
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Elf64_Off e_phoff;
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Elf64_Off e_shoff;
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uint32_t e_flags;
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uint16_t e_ehsize;
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uint16_t e_phentsize;
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uint16_t e_phnum;
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uint16_t e_shentsize;
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uint16_t e_shnum;
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uint16_t e_shstrndx;
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} Elf64_Ehdr;
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#define PT_NULL 0
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#define PT_LOAD 1
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#define PT_DYNAMIC 2
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#define PT_INTERP 3
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#define PT_NOTE 4
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#define PT_SHLIB 5
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#define PF_X (1 << 0)
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#define PF_W (1 << 1)
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#define PF_R (1 << 2)
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typedef struct {
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uint32_t p_type;
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uint32_t p_flags;
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Elf64_Off p_offset;
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Elf64_Addr p_vaddr;
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Elf64_Addr p_paddr;
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uint64_t p_filesz;
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uint64_t p_memsz;
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uint64_t p_align;
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} Elf64_Phdr;
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void elf_load(char *data);
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@ -1,66 +1 @@
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#pragma once
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#include <stdint.h>
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struct vfs {
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struct vfs *vfs_next; /* next vfs in list */
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struct vfsops *vfs_op; /* operations on vfs */
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struct vnode *vfs_vnodecovered; /* vnode we cover */
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int vfs_flag; /* flags */
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int vfs_bsize; /* native block size */
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uint64_t vfs_data; /* private data */
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};
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struct vfsops {
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int (*vfs_mount)();
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int (*vfs_unmount)();
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int (*vfs_root)();
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int (*vfs_statfs)();
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int (*vfs_sync)();
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int (*vfs_fid)();
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int (*vfs_vget)();
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};
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enum vtype { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VBAD };
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struct vnode {
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uint16_t v_flag; /* vnode flags */
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uint16_t v_count; /* reference count */
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uint16_t v_shlockc; /* # of shared locks */
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uint16_t v_exlockc; /* # of exclusive locks */
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struct vfs *v_vfsmountedhere; /* covering vfs */
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struct vnodeops *v_op; /* vnode operations */
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union {
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struct socket *v_Socket; /* unix ipc */
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struct stdata *v_Stream; /* stream */
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};
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struct vfs *v_vfsp; /* vfs we are in */
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enum vtype v_type; /* vnode type */
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uint64_t v_data; /* private data */
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};
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struct vnodeops {
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int (*vn_open)();
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int (*vn_close)();
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int (*vn_rdwr)();
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int (*vn_ioctl)();
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int (*vn_select)();
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int (*vn_getattr)();
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int (*vn_setattr)();
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int (*vn_access)();
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int (*vn_lookup)();
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int (*vn_create)();
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int (*vn_remove)();
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int (*vn_link)();
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int (*vn_rename)();
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int (*vn_mkdir)();
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int (*vn_rmdir)();
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int (*vn_readdir)();
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int (*vn_symlink)();
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int (*vn_readlink)();
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int (*vn_fsync)();
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int (*vn_inactive)();
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int (*vn_bmap)();
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int (*vn_strategy)();
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int (*vn_bread)();
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int (*vn_brelse)();
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};
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@ -1,3 +1,4 @@
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#include "exec/elf.h"
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#include "mm/pmm.h"
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#include "mm/vmm.h"
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#include "rt.h"
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@ -35,6 +36,12 @@ static volatile struct limine_framebuffer_request framebuffer_request = {
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.revision = 0
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};
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__attribute__((used, section(".limine_requests")))
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static volatile struct limine_module_request module_request = {
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.id = LIMINE_MODULE_REQUEST,
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.revision = 0
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};
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/*__attribute__((used, section(".limine_requests")))
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static volatile struct limine_entry_point_request entrypoint_request = {
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.id = LIMINE_ENTRY_POINT_REQUEST,
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@ -112,18 +119,23 @@ void kmain(void) {
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vmm_init();
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pit_init(1000);
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//sched_init();
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sched_init();
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//user_init();
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uint8_t *mem = pmm_request_page();
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mem[0] = 0xCD;
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mem[1] = 0x80;
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struct limine_file *f = module_request.response->modules[0];
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log("kmain - %s\n", f->path);
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elf_load((char*)f->address);
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//uint8_t *mem = pmm_request_page();
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//mem[0] = 0xCD;
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//mem[1] = 0x80;
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//mem[2] = 0xF4;
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//mem[3] = 0xFE;
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pagemap_t* pm = vmm_alloc_pm();
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vmm_map(pm, 0x1000, (uint64_t)mem, VMM_PRESENT | VMM_USER);
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sched_create("Init", 0x1000, pm, SCHED_USER_PROCESS);
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//pagemap_t* pm = vmm_alloc_pm();
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//vmm_map(pm, 0x1000, (uint64_t)mem, VMM_PRESENT | VMM_USER);
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//sched_create("Init", 0x1000, pm, SCHED_USER_PROCESS);
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log("kernel - Soaplin initialized sucessfully.\n");
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@ -90,6 +90,8 @@ sched_process *sched_create(char *name, uint64_t entry_point, pagemap_t* pm, uin
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log("sched - Standby mode has been"
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"disabled.\n");
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}
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log("sched - created process '%s' (pid: %d, rip: %p)\n", proc->name, proc->pid, proc->regs.rip);
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return proc;
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}
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