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Merge pull request #66 from m4xw/feature/elf_loader

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Implement basic elfloader/module support
This commit is contained in:
Kostas Missos 2018-08-08 00:25:40 +03:00 committed by GitHub
commit 2666b440ef
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GPG key ID: 4AEE18F83AFDEB23
20 changed files with 1542 additions and 46 deletions
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2
.gitignore vendored
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@ -1,4 +1,4 @@
.vs
.vscode
build_ipl/*
/ipl.bin
output/*

23
Makefile
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@ -6,7 +6,9 @@ include $(DEVKITARM)/base_rules
TARGET := ipl
BUILD := build_ipl
OUTPUT := output
SOURCEDIR := ipl
OBJS = $(addprefix $(BUILD)/, \
start.o \
main.o \
@ -43,27 +45,34 @@ OBJS = $(addprefix $(BUILD)/, \
uart.o \
ini.o \
)
OBJS += $(addprefix $(BUILD)/, diskio.o ff.o ffunicode.o ffsystem.o)
OBJS += $(addprefix $(BUILD)/elfloader/, elfload.o elfreloc_arm.o)
ARCH := -march=armv4t -mtune=arm7tdmi -mthumb -mthumb-interwork
CUSTOMDEFINES := -DMENU_LOGO_ENABLE
CUSTOMDEFINES := -DMENU_LOGO_ENABLE #-DDEBUG
CFLAGS = $(ARCH) -O2 -nostdlib -ffunction-sections -fdata-sections -fomit-frame-pointer -fno-inline -std=gnu11 -Wall $(CUSTOMDEFINES)
LDFLAGS = $(ARCH) -nostartfiles -lgcc -Wl,--nmagic,--gc-sections
.PHONY: all clean
MODULEDIRS := $(wildcard modules/*)
.PHONY: all clean $(MODULEDIRS)
all: $(TARGET).bin
@echo -n "Payload size is "
@wc -c < $(TARGET).bin
@wc -c < $(OUTPUT)/$(TARGET).bin
@echo "Max size is 126296 Bytes."
clean:
@rm -rf $(OBJS)
@rm -rf $(BUILD)
@rm -rf $(TARGET).bin
@rm -rf $(OUTPUT)
$(TARGET).bin: $(BUILD)/$(TARGET).elf
$(OBJCOPY) -S -O binary $< $@
$(MODULEDIRS):
$(MAKE) -C $@ $(MAKECMDGOALS)
$(TARGET).bin: $(BUILD)/$(TARGET).elf $(MODULEDIRS)
$(OBJCOPY) -S -O binary $< $(OUTPUT)/$@
$(BUILD)/$(TARGET).elf: $(OBJS)
$(CC) $(LDFLAGS) -T ipl/link.ld $^ -o $@
@ -73,4 +82,6 @@ $(BUILD)/%.o: $(SOURCEDIR)/%.c
$(BUILD)/%.o: $(SOURCEDIR)/%.S
@mkdir -p "$(BUILD)"
@mkdir -p "$(BUILD)/elfloader"
@mkdir -p "$(OUTPUT)"
$(CC) $(CFLAGS) -c $< -o $@

1
README.md
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@ -53,6 +53,7 @@ Open source and free packages used:
- FatFs R0.13a, Copyright (C) 2017, ChaN
- bcl-1.2.0, Copyright (C) 2003-2006, Marcus Geelnard
- Atmosphère (SE sha256, prc id kernel patches), Copyright (C) 2018, Atmosphère-NX
- elfload, Copyright (C) 2014 Owen Shepherd, Copyright (C) 2018 M4xw
___
.-' `'.

43
common/common_gfx.h Normal file
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@ -0,0 +1,43 @@
/*
* Common Gfx Header
* Copyright (c) 2018 naehrwert
* Copyright (C) 2018 CTCaer
* Copyright (C) 2018 M4xw
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "../ipl/types.h"
typedef struct _gfx_ctxt_t
{
u32 *fb;
u32 width;
u32 height;
u32 stride;
} gfx_ctxt_t;
typedef struct _gfx_con_t
{
gfx_ctxt_t *gfx_ctxt;
u32 fntsz;
u32 x;
u32 y;
u32 savedx;
u32 savedy;
u32 fgcol;
int fillbg;
u32 bgcol;
int mute;
} gfx_con_t;

33
common/common_heap.h Normal file
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@ -0,0 +1,33 @@
/*
* Copyright (c) 2018 naehrwert
* Copyright (c) 2018 M4xw
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "../ipl/types.h"
typedef struct _hnode
{
int used;
u32 size;
struct _hnode *prev;
struct _hnode *next;
} hnode_t;
typedef struct _heap
{
u32 start;
hnode_t *first;
} heap_t;

38
common/common_module.h Normal file
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@ -0,0 +1,38 @@
/*
* Common Module Header
* Copyright (C) 2018 M4xw
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stddef.h>
#include "common_gfx.h"
#include "common_heap.h"
// Module Callback
typedef void (*cbMainModule_t)(const char *s);
typedef void (*memcpy_t)(void *, void *, size_t);
typedef void (*memset_t)(void *test, int, size_t);
typedef struct moduleConfiguration_t
{
gfx_con_t *gfxCon;
gfx_ctxt_t *gfxCtx;
heap_t *sharedHeap;
memcpy_t memcpy;
memset_t memset;
} *pmoduleConfiguration_t;
// Module Entrypoint
typedef void (*moduleEntrypoint_t)(cbMainModule_t, pmoduleConfiguration_t);

3
ipl/elfloader/README.md Normal file
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@ -0,0 +1,3 @@
Simple elf-loader based on https://github.com/erincandescent/elfload
Each file contains its own LICENSE

589
ipl/elfloader/elf.h Normal file
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@ -0,0 +1,589 @@
/* $OpenBSD: exec_elf.h,v 1.53 2014/01/03 03:00:39 guenther Exp $ */
/*
* Copyright (c) 1995, 1996 Erik Theisen. 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/* imported sys/exec_elf.h from OpenBSD */
#ifndef ELF_H
#define ELF_H
#include <stdint.h>
typedef uint8_t Elf_Byte;
typedef uint32_t Elf32_Addr; /* Unsigned program address */
typedef uint32_t Elf32_Off; /* Unsigned file offset */
typedef int32_t Elf32_Sword; /* Signed large integer */
typedef uint32_t Elf32_Word; /* Unsigned large integer */
typedef uint16_t Elf32_Half; /* Unsigned medium integer */
typedef uint64_t Elf64_Addr;
typedef uint64_t Elf64_Off;
typedef int32_t Elf64_Shalf;
#ifdef __alpha__
typedef int64_t Elf64_Sword;
typedef uint64_t Elf64_Word;
#else
typedef int32_t Elf64_Sword;
typedef uint32_t Elf64_Word;
#endif
typedef int64_t Elf64_Sxword;
typedef uint64_t Elf64_Xword;
typedef uint32_t Elf64_Half;
typedef uint16_t Elf64_Quarter;
/*
* e_ident[] identification indexes
* See http://www.sco.com/developers/gabi/latest/ch4.eheader.html
*/
#define EI_MAG0 0 /* file ID */
#define EI_MAG1 1 /* file ID */
#define EI_MAG2 2 /* file ID */
#define EI_MAG3 3 /* file ID */
#define EI_CLASS 4 /* file class */
#define EI_DATA 5 /* data encoding */
#define EI_VERSION 6 /* ELF header version */
#define EI_OSABI 7 /* OS/ABI ID */
#define EI_ABIVERSION 8 /* ABI version */
#define EI_PAD 9 /* start of pad bytes */
#define EI_NIDENT 16 /* Size of e_ident[] */
/* e_ident[] magic number */
#define ELFMAG0 0x7f /* e_ident[EI_MAG0] */
#define ELFMAG1 'E' /* e_ident[EI_MAG1] */
#define ELFMAG2 'L' /* e_ident[EI_MAG2] */
#define ELFMAG3 'F' /* e_ident[EI_MAG3] */
#define ELFMAG "\177ELF" /* magic */
#define SELFMAG 4 /* size of magic */
/* e_ident[] file class */
#define ELFCLASSNONE 0 /* invalid */
#define ELFCLASS32 1 /* 32-bit objs */
#define ELFCLASS64 2 /* 64-bit objs */
#define ELFCLASSNUM 3 /* number of classes */
/* e_ident[] data encoding */
#define ELFDATANONE 0 /* invalid */
#define ELFDATA2LSB 1 /* Little-Endian */
#define ELFDATA2MSB 2 /* Big-Endian */
#define ELFDATANUM 3 /* number of data encode defines */
/* e_ident[] Operating System/ABI */
#define ELFOSABI_SYSV 0 /* UNIX System V ABI */
#define ELFOSABI_HPUX 1 /* HP-UX operating system */
#define ELFOSABI_NETBSD 2 /* NetBSD */
#define ELFOSABI_LINUX 3 /* GNU/Linux */
#define ELFOSABI_HURD 4 /* GNU/Hurd */
#define ELFOSABI_86OPEN 5 /* 86Open common IA32 ABI */
#define ELFOSABI_SOLARIS 6 /* Solaris */
#define ELFOSABI_MONTEREY 7 /* Monterey */
#define ELFOSABI_IRIX 8 /* IRIX */
#define ELFOSABI_FREEBSD 9 /* FreeBSD */
#define ELFOSABI_TRU64 10 /* TRU64 UNIX */
#define ELFOSABI_MODESTO 11 /* Novell Modesto */
#define ELFOSABI_OPENBSD 12 /* OpenBSD */
#define ELFOSABI_ARM 97 /* ARM */
#define ELFOSABI_STANDALONE 255 /* Standalone (embedded) application */
/* e_ident */
#define IS_ELF(ehdr) ((ehdr).e_ident[EI_MAG0] == ELFMAG0 && \
(ehdr).e_ident[EI_MAG1] == ELFMAG1 && \
(ehdr).e_ident[EI_MAG2] == ELFMAG2 && \
(ehdr).e_ident[EI_MAG3] == ELFMAG3)
/* ELF Header */
typedef struct
{
unsigned char e_ident[EI_NIDENT]; /* ELF Identification */
Elf32_Half e_type; /* object file type */
Elf32_Half e_machine; /* machine */
Elf32_Word e_version; /* object file version */
Elf32_Addr e_entry; /* virtual entry point */
Elf32_Off e_phoff; /* program header table offset */
Elf32_Off e_shoff; /* section header table offset */
Elf32_Word e_flags; /* processor-specific flags */
Elf32_Half e_ehsize; /* ELF header size */
Elf32_Half e_phentsize; /* program header entry size */
Elf32_Half e_phnum; /* number of program header entries */
Elf32_Half e_shentsize; /* section header entry size */
Elf32_Half e_shnum; /* number of section header entries */
Elf32_Half e_shstrndx; /* section header table's "section
header string table" entry offset */
} Elf32_Ehdr;
typedef struct
{
unsigned char e_ident[EI_NIDENT]; /* Id bytes */
Elf64_Quarter e_type; /* file type */
Elf64_Quarter e_machine; /* machine type */
Elf64_Half e_version; /* version number */
Elf64_Addr e_entry; /* entry point */
Elf64_Off e_phoff; /* Program hdr offset */
Elf64_Off e_shoff; /* Section hdr offset */
Elf64_Half e_flags; /* Processor flags */
Elf64_Quarter e_ehsize; /* sizeof ehdr */
Elf64_Quarter e_phentsize; /* Program header entry size */
Elf64_Quarter e_phnum; /* Number of program headers */
Elf64_Quarter e_shentsize; /* Section header entry size */
Elf64_Quarter e_shnum; /* Number of section headers */
Elf64_Quarter e_shstrndx; /* String table index */
} Elf64_Ehdr;
/* e_type */
#define ET_NONE 0 /* No file type */
#define ET_REL 1 /* relocatable file */
#define ET_EXEC 2 /* executable file */
#define ET_DYN 3 /* shared object file */
#define ET_CORE 4 /* core file */
#define ET_NUM 5 /* number of types */
#define ET_LOPROC 0xff00 /* reserved range for processor */
#define ET_HIPROC 0xffff /* specific e_type */
/* e_machine */
#define EM_NONE 0 /* No Machine */
#define EM_M32 1 /* AT&T WE 32100 */
#define EM_SPARC 2 /* SPARC */
#define EM_386 3 /* Intel 80386 */
#define EM_68K 4 /* Motorola 68000 */
#define EM_88K 5 /* Motorola 88000 */
#define EM_486 6 /* Intel 80486 - unused? */
#define EM_860 7 /* Intel 80860 */
#define EM_MIPS 8 /* MIPS R3000 Big-Endian only */
/*
* Don't know if EM_MIPS_RS4_BE,
* EM_SPARC64, EM_PARISC,
* or EM_PPC are ABI compliant
*/
#define EM_MIPS_RS4_BE 10 /* MIPS R4000 Big-Endian */
#define EM_SPARC64 11 /* SPARC v9 64-bit unofficial */
#define EM_PARISC 15 /* HPPA */
#define EM_SPARC32PLUS 18 /* Enhanced instruction set SPARC */
#define EM_PPC 20 /* PowerPC */
#define EM_ARM 40 /* ARM AArch32 */
#define EM_ALPHA 41 /* DEC ALPHA */
#define EM_SH 42 /* Hitachi/Renesas Super-H */
#define EM_SPARCV9 43 /* SPARC version 9 */
#define EM_IA_64 50 /* Intel IA-64 Processor */
#define EM_AMD64 62 /* AMD64 architecture */
#define EM_VAX 75 /* DEC VAX */
#define EM_AARCH64 183 /* ARM AArch64 */
/* Non-standard */
#define EM_ALPHA_EXP 0x9026 /* DEC ALPHA */
/* Version */
#define EV_NONE 0 /* Invalid */
#define EV_CURRENT 1 /* Current */
#define EV_NUM 2 /* number of versions */
/* Section Header */
typedef struct
{
Elf32_Word sh_name; /* name - index into section header
* string table section */
Elf32_Word sh_type; /* type */
Elf32_Word sh_flags; /* flags */
Elf32_Addr sh_addr; /* address */
Elf32_Off sh_offset; /* file offset */
Elf32_Word sh_size; /* section size */
Elf32_Word sh_link; /* section header table index link */
Elf32_Word sh_info; /* extra information */
Elf32_Word sh_addralign; /* address alignment */
Elf32_Word sh_entsize; /* section entry size */
} Elf32_Shdr;
typedef struct
{
Elf64_Half sh_name; /* section name */
Elf64_Half sh_type; /* section type */
Elf64_Xword sh_flags; /* section flags */
Elf64_Addr sh_addr; /* virtual address */
Elf64_Off sh_offset; /* file offset */
Elf64_Xword sh_size; /* section size */
Elf64_Half sh_link; /* link to another */
Elf64_Half sh_info; /* misc info */
Elf64_Xword sh_addralign; /* memory alignment */
Elf64_Xword sh_entsize; /* table entry size */
} Elf64_Shdr;
/* Special Section Indexes */
#define SHN_UNDEF 0 /* undefined */
#define SHN_LORESERVE 0xff00 /* lower bounds of reserved indexes */
#define SHN_LOPROC 0xff00 /* reserved range for processor */
#define SHN_HIPROC 0xff1f /* specific section indexes */
#define SHN_ABS 0xfff1 /* absolute value */
#define SHN_COMMON 0xfff2 /* common symbol */
#define SHN_HIRESERVE 0xffff /* upper bounds of reserved indexes */
/* sh_type */
#define SHT_NULL 0 /* inactive */
#define SHT_PROGBITS 1 /* program defined information */
#define SHT_SYMTAB 2 /* symbol table section */
#define SHT_STRTAB 3 /* string table section */
#define SHT_RELA 4 /* relocation section with addends*/
#define SHT_HASH 5 /* symbol hash table section */
#define SHT_DYNAMIC 6 /* dynamic section */
#define SHT_NOTE 7 /* note section */
#define SHT_NOBITS 8 /* no space section */
#define SHT_REL 9 /* relation section without addends */
#define SHT_SHLIB 10 /* reserved - purpose unknown */
#define SHT_DYNSYM 11 /* dynamic symbol table section */
#define SHT_NUM 12 /* number of section types */
#define SHT_LOPROC 0x70000000 /* reserved range for processor */
#define SHT_HIPROC 0x7fffffff /* specific section header types */
#define SHT_LOUSER 0x80000000 /* reserved range for application */
#define SHT_HIUSER 0xffffffff /* specific indexes */
/* Section names */
#define ELF_BSS ".bss" /* uninitialized data */
#define ELF_DATA ".data" /* initialized data */
#define ELF_DEBUG ".debug" /* debug */
#define ELF_DYNAMIC ".dynamic" /* dynamic linking information */
#define ELF_DYNSTR ".dynstr" /* dynamic string table */
#define ELF_DYNSYM ".dynsym" /* dynamic symbol table */
#define ELF_FINI ".fini" /* termination code */
#define ELF_GOT ".got" /* global offset table */
#define ELF_HASH ".hash" /* symbol hash table */
#define ELF_INIT ".init" /* initialization code */
#define ELF_REL_DATA ".rel.data" /* relocation data */
#define ELF_REL_FINI ".rel.fini" /* relocation termination code */
#define ELF_REL_INIT ".rel.init" /* relocation initialization code */
#define ELF_REL_DYN ".rel.dyn" /* relocation dynamic link info */
#define ELF_REL_RODATA ".rel.rodata" /* relocation read-only data */
#define ELF_REL_TEXT ".rel.text" /* relocation code */
#define ELF_RODATA ".rodata" /* read-only data */
#define ELF_SHSTRTAB ".shstrtab" /* section header string table */
#define ELF_STRTAB ".strtab" /* string table */
#define ELF_SYMTAB ".symtab" /* symbol table */
#define ELF_TEXT ".text" /* code */
/* Section Attribute Flags - sh_flags */
#define SHF_WRITE 0x1 /* Writable */
#define SHF_ALLOC 0x2 /* occupies memory */
#define SHF_EXECINSTR 0x4 /* executable */
#define SHF_TLS 0x400 /* thread local storage */
#define SHF_MASKPROC 0xf0000000 /* reserved bits for processor \
* specific section attributes */
/* Symbol Table Entry */
typedef struct elf32_sym
{
Elf32_Word st_name; /* name - index into string table */
Elf32_Addr st_value; /* symbol value */
Elf32_Word st_size; /* symbol size */
unsigned char st_info; /* type and binding */
unsigned char st_other; /* 0 - no defined meaning */
Elf32_Half st_shndx; /* section header index */
} Elf32_Sym;
typedef struct
{
Elf64_Half st_name; /* Symbol name index in str table */
Elf_Byte st_info; /* type / binding attrs */
Elf_Byte st_other; /* unused */
Elf64_Quarter st_shndx; /* section index of symbol */
Elf64_Xword st_value; /* value of symbol */
Elf64_Xword st_size; /* size of symbol */
} Elf64_Sym;
/* Symbol table index */
#define STN_UNDEF 0 /* undefined */
/* Extract symbol info - st_info */
#define ELF32_ST_BIND(x) ((x) >> 4)
#define ELF32_ST_TYPE(x) (((unsigned int)x) & 0xf)
#define ELF32_ST_INFO(b, t) (((b) << 4) + ((t)&0xf))
#define ELF64_ST_BIND(x) ((x) >> 4)
#define ELF64_ST_TYPE(x) (((unsigned int)x) & 0xf)
#define ELF64_ST_INFO(b, t) (((b) << 4) + ((t)&0xf))
/* Symbol Binding - ELF32_ST_BIND - st_info */
#define STB_LOCAL 0 /* Local symbol */
#define STB_GLOBAL 1 /* Global symbol */
#define STB_WEAK 2 /* like global - lower precedence */
#define STB_NUM 3 /* number of symbol bindings */
#define STB_LOPROC 13 /* reserved range for processor */
#define STB_HIPROC 15 /* specific symbol bindings */
/* Symbol type - ELF32_ST_TYPE - st_info */
#define STT_NOTYPE 0 /* not specified */
#define STT_OBJECT 1 /* data object */
#define STT_FUNC 2 /* function */
#define STT_SECTION 3 /* section */
#define STT_FILE 4 /* file */
#define STT_TLS 6 /* thread local storage */
#define STT_LOPROC 13 /* reserved range for processor */
#define STT_HIPROC 15 /* specific symbol types */
/* Relocation entry with implicit addend */
typedef struct
{
Elf32_Addr r_offset; /* offset of relocation */
Elf32_Word r_info; /* symbol table index and type */
} Elf32_Rel;
/* Relocation entry with explicit addend */
typedef struct
{
Elf32_Addr r_offset; /* offset of relocation */
Elf32_Word r_info; /* symbol table index and type */
Elf32_Sword r_addend;
} Elf32_Rela;
/* Extract relocation info - r_info */
#define ELF32_R_SYM(i) ((i) >> 8)
#define ELF32_R_TYPE(i) ((unsigned char)(i))
#define ELF32_R_INFO(s, t) (((s) << 8) + (unsigned char)(t))
typedef struct
{
Elf64_Xword r_offset; /* where to do it */
Elf64_Xword r_info; /* index & type of relocation */
} Elf64_Rel;
typedef struct
{
Elf64_Xword r_offset; /* where to do it */
Elf64_Xword r_info; /* index & type of relocation */
Elf64_Sxword r_addend; /* adjustment value */
} Elf64_Rela;
#define ELF64_R_SYM(info) ((info) >> 32)
#define ELF64_R_TYPE(info) ((info)&0xFFFFFFFF)
#define ELF64_R_INFO(s, t) (((s) << 32) + (__uint32_t)(t))
#if defined(__mips64__) && defined(__MIPSEL__)
/*
* The 64-bit MIPS ELF ABI uses a slightly different relocation format
* than the regular ELF ABI: the r_info field is split into several
* pieces (see gnu/usr.bin/binutils/include/elf/mips.h for details).
*/
#undef ELF64_R_SYM
#undef ELF64_R_TYPE
#undef ELF64_R_INFO
#define ELF64_R_TYPE(info) (swap32((info) >> 32))
#define ELF64_R_SYM(info) ((info)&0xFFFFFFFF)
#define ELF64_R_INFO(s, t) (((__uint64_t)swap32(t) << 32) + (__uint32_t)(s))
#endif /* __mips64__ && __MIPSEL__ */
/* Program Header */
typedef struct
{
Elf32_Word p_type; /* segment type */
Elf32_Off p_offset; /* segment offset */
Elf32_Addr p_vaddr; /* virtual address of segment */
Elf32_Addr p_paddr; /* physical address - ignored? */
Elf32_Word p_filesz; /* number of bytes in file for seg. */
Elf32_Word p_memsz; /* number of bytes in mem. for seg. */
Elf32_Word p_flags; /* flags */
Elf32_Word p_align; /* memory alignment */
} Elf32_Phdr;
typedef struct
{
Elf64_Half p_type; /* entry type */
Elf64_Half p_flags; /* flags */
Elf64_Off p_offset; /* offset */
Elf64_Addr p_vaddr; /* virtual address */
Elf64_Addr p_paddr; /* physical address */
Elf64_Xword p_filesz; /* file size */
Elf64_Xword p_memsz; /* memory size */
Elf64_Xword p_align; /* memory & file alignment */
} Elf64_Phdr;
/* Segment types - p_type */
#define PT_NULL 0 /* unused */
#define PT_LOAD 1 /* loadable segment */
#define PT_DYNAMIC 2 /* dynamic linking section */
#define PT_INTERP 3 /* the RTLD */
#define PT_NOTE 4 /* auxiliary information */
#define PT_SHLIB 5 /* reserved - purpose undefined */
#define PT_PHDR 6 /* program header */
#define PT_TLS 7 /* thread local storage */
#define PT_LOOS 0x60000000 /* reserved range for OS */
#define PT_HIOS 0x6fffffff /* specific segment types */
#define PT_LOPROC 0x70000000 /* reserved range for processor */
#define PT_HIPROC 0x7fffffff /* specific segment types */
#define PT_OPENBSD_RANDOMIZE 0x65a3dbe6 /* fill with random data */
#define PT_GANDR_KERNEL 0x67646b6c /* gdkl */
/* Segment flags - p_flags */
#define PF_X 0x1 /* Executable */
#define PF_W 0x2 /* Writable */
#define PF_R 0x4 /* Readable */
#define PF_MASKPROC 0xf0000000 /* reserved bits for processor */
/* specific segment flags */
/* Dynamic structure */
typedef struct
{
Elf32_Sword d_tag; /* controls meaning of d_val */
union {
Elf32_Word d_val; /* Multiple meanings - see d_tag */
Elf32_Addr d_ptr; /* program virtual address */
} d_un;
} Elf32_Dyn;
typedef struct
{
Elf64_Xword d_tag; /* controls meaning of d_val */
union {
Elf64_Addr d_ptr;
Elf64_Xword d_val;
} d_un;
} Elf64_Dyn;
/* Dynamic Array Tags - d_tag */
#define DT_NULL 0 /* marks end of _DYNAMIC array */
#define DT_NEEDED 1 /* string table offset of needed lib */
#define DT_PLTRELSZ 2 /* size of relocation entries in PLT */
#define DT_PLTGOT 3 /* address PLT/GOT */
#define DT_HASH 4 /* address of symbol hash table */
#define DT_STRTAB 5 /* address of string table */
#define DT_SYMTAB 6 /* address of symbol table */
#define DT_RELA 7 /* address of relocation table */
#define DT_RELASZ 8 /* size of relocation table */
#define DT_RELAENT 9 /* size of relocation entry */
#define DT_STRSZ 10 /* size of string table */
#define DT_SYMENT 11 /* size of symbol table entry */
#define DT_INIT 12 /* address of initialization func. */
#define DT_FINI 13 /* address of termination function */
#define DT_SONAME 14 /* string table offset of shared obj */
#define DT_RPATH 15 /* string table offset of library \
* search path */
#define DT_SYMBOLIC 16 /* start sym search in shared obj. */
#define DT_REL 17 /* address of rel. tbl. w addends */
#define DT_RELSZ 18 /* size of DT_REL relocation table */
#define DT_RELENT 19 /* size of DT_REL relocation entry */
#define DT_PLTREL 20 /* PLT referenced relocation entry */
#define DT_DEBUG 21 /* bugger */
#define DT_TEXTREL 22 /* Allow rel. mod. to unwritable seg */
#define DT_JMPREL 23 /* add. of PLT's relocation entries */
#define DT_BIND_NOW 24 /* Bind now regardless of env setting */
#define DT_LOOS 0x6000000d /* reserved range for OS */
#define DT_HIOS 0x6ffff000 /* specific dynamic array tags */
#define DT_LOPROC 0x70000000 /* reserved range for processor */
#define DT_HIPROC 0x7fffffff /* specific dynamic array tags */
/* some other useful tags */
#define DT_RELACOUNT 0x6ffffff9 /* if present, number of RELATIVE */
#define DT_RELCOUNT 0x6ffffffa /* relocs, which must come first */
#define DT_FLAGS_1 0x6ffffffb
/* Dynamic Flags - DT_FLAGS_1 .dynamic entry */
#define DF_1_NOW 0x00000001
#define DF_1_GLOBAL 0x00000002
#define DF_1_GROUP 0x00000004
#define DF_1_NODELETE 0x00000008
#define DF_1_LOADFLTR 0x00000010
#define DF_1_INITFIRST 0x00000020
#define DF_1_NOOPEN 0x00000040
#define DF_1_ORIGIN 0x00000080
#define DF_1_DIRECT 0x00000100
#define DF_1_TRANS 0x00000200
#define DF_1_INTERPOSE 0x00000400
#define DF_1_NODEFLIB 0x00000800
#define DF_1_NODUMP 0x00001000
#define DF_1_CONLFAT 0x00002000
/* ld.so: number of low tags that are used saved internally (0 .. DT_NUM-1) */
#define DT_NUM (DT_JMPREL + 1)
/*
* Note Definitions
*/
typedef struct
{
Elf32_Word namesz;
Elf32_Word descsz;
Elf32_Word type;
} Elf32_Note;
typedef struct
{
Elf64_Half namesz;
Elf64_Half descsz;
Elf64_Half type;
} Elf64_Note;
#if defined(ELFSIZE) && (ELFSIZE == 32)
#define Elf_Ehdr Elf32_Ehdr
#define Elf_Phdr Elf32_Phdr
#define Elf_Shdr Elf32_Shdr
#define Elf_Sym Elf32_Sym
#define Elf_Rel Elf32_Rel
#define Elf_RelA Elf32_Rela
#define Elf_Dyn Elf32_Dyn
#define Elf_Half Elf32_Half
#define Elf_Word Elf32_Word
#define Elf_Sword Elf32_Sword
#define Elf_Addr Elf32_Addr
#define Elf_Off Elf32_Off
#define Elf_Nhdr Elf32_Nhdr
#define Elf_Note Elf32_Note
#define ELF_R_SYM ELF32_R_SYM
#define ELF_R_TYPE ELF32_R_TYPE
#define ELF_R_INFO ELF32_R_INFO
#define ELFCLASS ELFCLASS32
#define ELF_ST_BIND ELF32_ST_BIND
#define ELF_ST_TYPE ELF32_ST_TYPE
#define ELF_ST_INFO ELF32_ST_INFO
#elif defined(ELFSIZE) && (ELFSIZE == 64)
#define Elf_Ehdr Elf64_Ehdr
#define Elf_Phdr Elf64_Phdr
#define Elf_Shdr Elf64_Shdr
#define Elf_Sym Elf64_Sym
#define Elf_Rel Elf64_Rel
#define Elf_RelA Elf64_Rela
#define Elf_Dyn Elf64_Dyn
#define Elf_Half Elf64_Half
#define Elf_Word Elf64_Word
#define Elf_Sword Elf64_Sword
#define Elf_Addr Elf64_Addr
#define Elf_Off Elf64_Off
#define Elf_Nhdr Elf64_Nhdr
#define Elf_Note Elf64_Note
#define ELF_R_SYM ELF64_R_SYM
#define ELF_R_TYPE ELF64_R_TYPE
#define ELF_R_INFO ELF64_R_INFO
#define ELFCLASS ELFCLASS64
#define ELF_ST_BIND ELF64_ST_BIND
#define ELF_ST_TYPE ELF64_ST_TYPE
#define ELF_ST_INFO ELF64_ST_INFO
#endif
#endif

47
ipl/elfloader/elfarch.h Normal file
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@ -0,0 +1,47 @@
/* Copyright © 2014, Owen Shepherd
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef ELFARCH_H
#define ELFARCH_H
#if defined(__i386__)
#define EM_THIS EM_386
#define EL_ARCH_USES_REL
#elif defined(__amd64__)
#define EM_THIS EM_AMD64
#define EL_ARCH_USES_RELA
#elif defined(__arm__)
#define EM_THIS EM_ARM
#define EL_ARCH_USES_REL
#elif defined(__aarch64__)
#define EM_THIS EM_AARCH64
#define EL_ARCH_USES_RELA
#define EL_ARCH_USES_REL
#else
#error specify your ELF architecture
#endif
#if defined(__LP64__) || defined(__LLP64__)
#define ELFSIZE 64
#else
#define ELFSIZE 32
#endif
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define ELFDATATHIS ELFDATA2LSB
#else
#define ELFDATATHIS ELFDATA2MSB
#endif
#endif

322
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/* Copyright © 2018, M4xw
* Copyright © 2014, Owen Shepherd
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include "elfload.h"
#include <string.h>
el_status el_pread(el_ctx *ctx, void *def, size_t nb, size_t offset)
{
return ctx->pread(ctx, def, nb, offset) ? EL_OK : EL_EIO;
}
#define EL_PHOFF(ctx, num) (((ctx)->ehdr.e_phoff + (num) *(ctx)->ehdr.e_phentsize))
el_status el_findphdr(el_ctx *ctx, Elf_Phdr *phdr, uint32_t type, unsigned *i)
{
el_status rv = EL_OK;
for (; *i < ctx->ehdr.e_phnum; (*i)++)
{
if ((rv = el_pread(ctx, phdr, sizeof *phdr, EL_PHOFF(ctx, *i))))
return rv;
if (phdr->p_type == type)
{
return rv;
}
}
*i = -1;
return rv;
}
#define EL_SHOFF(ctx, num) (((ctx)->ehdr.e_shoff + (num) *(ctx)->ehdr.e_shentsize))
el_status el_findshdr(el_ctx *ctx, Elf_Shdr *shdr, uint32_t type, unsigned *i)
{
el_status rv = EL_OK;
for (; *i < ctx->ehdr.e_shnum; (*i)++)
{
if ((rv = el_pread(ctx, shdr, sizeof *shdr, EL_SHOFF(ctx, *i))))
return rv;
if (shdr->sh_type == type)
{
return rv;
}
}
*i = -1;
return rv;
}
el_status el_init(el_ctx *ctx)
{
el_status rv = EL_OK;
if ((rv = el_pread(ctx, &ctx->ehdr, sizeof ctx->ehdr, 0)))
return rv;
/* validate header */
if (!IS_ELF(ctx->ehdr))
return EL_NOTELF;
if (ctx->ehdr.e_ident[EI_CLASS] != ELFCLASS)
return EL_WRONGBITS;
if (ctx->ehdr.e_ident[EI_DATA] != ELFDATATHIS)
return EL_WRONGENDIAN;
if (ctx->ehdr.e_ident[EI_VERSION] != EV_CURRENT)
return EL_NOTELF;
if (ctx->ehdr.e_type != ET_EXEC && ctx->ehdr.e_type != ET_DYN)
return EL_NOTEXEC;
if (ctx->ehdr.e_machine != EM_THIS)
return EL_WRONGARCH;
if (ctx->ehdr.e_version != EV_CURRENT)
return EL_NOTELF;
/* load phdrs */
Elf_Phdr ph;
/* iterate through, calculate extents */
ctx->base_load_paddr = ctx->base_load_vaddr = 0;
ctx->align = 1;
ctx->memsz = 0;
unsigned i = 0;
for (;;)
{
if ((rv = el_findphdr(ctx, &ph, PT_LOAD, &i)))
return rv;
if (i == (unsigned)-1)
break;
Elf_Addr phend = ph.p_vaddr + ph.p_memsz;
if (phend > ctx->memsz)
ctx->memsz = phend;
if (ph.p_align > ctx->align)
ctx->align = ph.p_align;
i++;
}
// Program Header
if (ctx->ehdr.e_type == ET_DYN)
{
i = 0;
if ((rv = el_findphdr(ctx, &ph, PT_DYNAMIC, &i)))
return rv;
if (i == (unsigned)-1)
return EL_NODYN;
ctx->dynoff = ph.p_offset;
ctx->dynsize = ph.p_filesz;
}
else
{
ctx->dynoff = 0;
ctx->dynsize = 0;
}
// Section String Table
if (ctx->ehdr.e_type == ET_DYN)
{
i = ctx->ehdr.e_shstrndx - 1;
if ((rv = el_findshdr(ctx, &ctx->shstr, SHT_STRTAB, &i)))
return rv;
// Reset
i = 0;
if ((rv = el_findshdr(ctx, &ctx->symtab, SHT_SYMTAB, &i)))
return rv;
if (i == (unsigned)-1)
return EL_NODYN;
}
return rv;
}
/*
typedef void* (*el_alloc_cb)(
el_ctx *ctx,
Elf_Addr phys,
Elf_Addr virt,
Elf_Addr size);
*/
el_status el_load(el_ctx *ctx, el_alloc_cb alloc)
{
el_status rv = EL_OK;
/* address deltas */
Elf_Addr pdelta = ctx->base_load_paddr;
Elf_Addr vdelta = ctx->base_load_vaddr;
/* iterate paddrs */
Elf_Phdr ph;
unsigned i = 0;
for (;;)
{
if ((rv = el_findphdr(ctx, &ph, PT_LOAD, &i)))
return rv;
if (i == (unsigned)-1)
break;
Elf_Addr pload = ph.p_paddr + pdelta;
Elf_Addr vload = ph.p_vaddr + vdelta;
/* allocate mem */
char *dest = alloc(ctx, pload, vload, ph.p_memsz);
if (!dest)
return EL_ENOMEM;
EL_DEBUG("Loading seg fileoff %x, vaddr %x to %p\n",
ph.p_offset, ph.p_vaddr, dest);
/* read loaded portion */
if ((rv = el_pread(ctx, dest, ph.p_filesz, ph.p_offset)))
return rv;
/* zero mem-only portion */
memset(dest + ph.p_filesz, 0, ph.p_memsz - ph.p_filesz);
i++;
}
return rv;
}
el_status el_finddyn(el_ctx *ctx, Elf_Dyn *dyn, uint32_t tag)
{
el_status rv = EL_OK;
size_t ndyn = ctx->dynsize / sizeof(Elf_Dyn);
for (unsigned i = 0; i < ndyn; i++)
{
if ((rv = el_pread(ctx, dyn, sizeof *dyn, ctx->dynoff + i * sizeof *dyn)))
return rv;
if (dyn->d_tag == tag)
return EL_OK;
}
dyn->d_tag = DT_NULL;
return EL_OK;
}
el_status el_findrelocs(el_ctx *ctx, el_relocinfo *ri, uint32_t type)
{
el_status rv = EL_OK;
Elf_Dyn rel, relsz, relent;
if ((rv = el_finddyn(ctx, &rel, type)))
return rv;
if ((rv = el_finddyn(ctx, &relsz, type + 1)))
return rv;
if ((rv = el_finddyn(ctx, &relent, type + 2)))
return rv;
if (rel.d_tag == DT_NULL || relsz.d_tag == DT_NULL || relent.d_tag == DT_NULL)
{
ri->entrysize = 0;
ri->tablesize = 0;
ri->tableoff = 0;
}
else
{
ri->tableoff = rel.d_un.d_ptr;
ri->tablesize = relsz.d_un.d_val;
ri->entrysize = relent.d_un.d_val;
}
return rv;
}
extern el_status el_applyrel(el_ctx *ctx, Elf_Rel *rel);
extern el_status el_applyrela(el_ctx *ctx, Elf_RelA *rela);
el_status el_relocate(el_ctx *ctx)
{
el_status rv = EL_OK;
// not dynamic
if (ctx->ehdr.e_type != ET_DYN)
return EL_OK;
char *base = (char *)ctx->base_load_paddr;
el_relocinfo ri;
#ifdef EL_ARCH_USES_REL
if ((rv = el_findrelocs(ctx, &ri, DT_REL)))
return rv;
if (ri.entrysize != sizeof(Elf_Rel) && ri.tablesize)
{
EL_DEBUG("Relocation size %u doesn't match expected %u\n",
ri.entrysize, sizeof(Elf_Rel));
return EL_BADREL;
}
size_t relcnt = ri.tablesize / sizeof(Elf_Rel);
Elf_Rel *reltab = (Elf_Rel *)(base + ri.tableoff);
for (size_t i = 0; i < relcnt; i++)
{
if ((rv = el_applyrel(ctx, &reltab[i])))
return rv;
}
#endif
#ifdef EL_ARCH_USES_RELA
if ((rv = el_findrelocs(ctx, &ri, DT_RELA)))
return rv;
if (ri.entrysize != sizeof(Elf_RelA) && ri.tablesize)
{
EL_DEBUG("Relocation size %u doesn't match expected %u\n",
ri.entrysize, sizeof(Elf_RelA));
return EL_BADREL;
}
size_t relacnt = ri.tablesize / sizeof(Elf_RelA);
Elf_RelA *relatab = (Elf_RelA *)(base + ri.tableoff);
for (size_t i = 0; i < relacnt; i++)
{
if ((rv = el_applyrela(ctx, &relatab[i])))
return rv;
}
#endif
#if !defined(EL_ARCH_USES_REL) && !defined(EL_ARCH_USES_RELA)
#error No relocation type defined!
#endif
return rv;
}

125
ipl/elfloader/elfload.h Normal file
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@ -0,0 +1,125 @@
/* Copyright © 2018, M4xw
* Copyright © 2014, Owen Shepherd
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef ELFLOAD_H
#define ELFLOAD_H
#include <stdbool.h>
#include <stddef.h>
#include "elfarch.h"
#include "elf.h"
#ifdef DEBUG
#include "../gfx.h"
extern gfx_con_t gfx_con;
#define EL_DEBUG(format, ...) \
gfx_printf(&gfx_con, format __VA_OPT__(, ) __VA_ARGS__)
#else
#define EL_DEBUG(...) \
do \
{ \
} while (0)
#endif
typedef enum
{
EL_OK = 0,
EL_EIO,
EL_ENOMEM,
EL_NOTELF,
EL_WRONGBITS,
EL_WRONGENDIAN,
EL_WRONGARCH,
EL_WRONGOS,
EL_NOTEXEC,
EL_NODYN,
EL_BADREL,
} el_status;
typedef struct el_ctx
{
bool (*pread)(struct el_ctx *ctx, void *dest, size_t nb, size_t offset);
/* base_load_* -> address we are actually going to load at
*/
Elf_Addr
base_load_paddr,
base_load_vaddr;
/* size in memory of binary */
Elf_Addr memsz;
/* required alignment */
Elf_Addr align;
/* ELF header */
Elf_Ehdr ehdr;
// Section Header Str Table
Elf_Shdr shstr;
Elf_Shdr symtab;
/* Offset of dynamic table (0 if not ET_DYN) */
Elf_Off dynoff;
/* Size of dynamic table (0 if not ET_DYN) */
Elf_Addr dynsize;
} el_ctx;
el_status el_pread(el_ctx *ctx, void *def, size_t nb, size_t offset);
el_status el_init(el_ctx *ctx);
typedef void *(*el_alloc_cb)(
el_ctx *ctx,
Elf_Addr phys,
Elf_Addr virt,
Elf_Addr size);
el_status el_load(el_ctx *ctx, el_alloc_cb alloccb);
/* find the next phdr of type \p type, starting at \p *i.
* On success, returns EL_OK with *i set to the phdr number, and the phdr loaded
* in *phdr.
*
* If the end of the phdrs table was reached, *i is set to -1 and the contents
* of *phdr are undefined
*/
el_status el_findphdr(el_ctx *ctx, Elf_Phdr *phdr, uint32_t type, unsigned *i);
/* Relocate the loaded executable */
el_status el_relocate(el_ctx *ctx);
/* find a dynamic table entry
* returns the entry on success, dyn->d_tag = DT_NULL on failure
*/
el_status el_finddyn(el_ctx *ctx, Elf_Dyn *dyn, uint32_t type);
typedef struct
{
Elf_Off tableoff;
Elf_Addr tablesize;
Elf_Addr entrysize;
} el_relocinfo;
/* find all information regarding relocations of a specific type.
*
* pass DT_REL or DT_RELA for type
* sets ri->entrysize = 0 if not found
*/
el_status el_findrelocs(el_ctx *ctx, el_relocinfo *ri, uint32_t type);
#endif

83
ipl/elfloader/elfreloc_aarch64.c Normal file
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@ -0,0 +1,83 @@
/* Copyright © 2014, Owen Shepherd
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include "elfload.h"
#if defined(__aarch64__)
#define R_AARCH64_NONE 0
#define R_AARCH64_RELATIVE 1027
el_status el_applyrela(el_ctx *ctx, Elf_RelA *rel)
{
uintptr_t *p = (uintptr_t *)(rel->r_offset + ctx->base_load_paddr);
uint32_t type = ELF_R_TYPE(rel->r_info);
uint32_t sym = ELF_R_SYM(rel->r_info);
switch (type)
{
case R_AARCH64_NONE:
EL_DEBUG("R_AARCH64_NONE\n");
break;
case R_AARCH64_RELATIVE:
if (sym)
{
EL_DEBUG("R_AARCH64_RELATIVE with symbol ref!\n");
return EL_BADREL;
}
EL_DEBUG("Applying R_AARCH64_RELATIVE reloc @%p\n", p);
*p = rel->r_addend + ctx->base_load_vaddr;
break;
default:
EL_DEBUG("Bad relocation %u\n", type);
return EL_BADREL;
}
return EL_OK;
}
el_status el_applyrel(el_ctx *ctx, Elf_Rel *rel)
{
uintptr_t *p = (uintptr_t *)(rel->r_offset + ctx->base_load_paddr);
uint32_t type = ELF_R_TYPE(rel->r_info);
uint32_t sym = ELF_R_SYM(rel->r_info);
switch (type)
{
case R_AARCH64_NONE:
EL_DEBUG("R_AARCH64_NONE\n");
break;
case R_AARCH64_RELATIVE:
if (sym)
{
EL_DEBUG("R_AARCH64_RELATIVE with symbol ref!\n");
return EL_BADREL;
}
EL_DEBUG("Applying R_AARCH64_RELATIVE reloc @%p\n", p);
*p += ctx->base_load_vaddr;
break;
default:
EL_DEBUG("Bad relocation %u\n", type);
return EL_BADREL;
}
return EL_OK;
}
#endif

66
ipl/elfloader/elfreloc_arm.c Normal file
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@ -0,0 +1,66 @@
/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <m4x@m4xw.net> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. M4xw
* ----------------------------------------------------------------------------
*/
#include "elfload.h"
#if defined(__arm__)
// Taken from http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044f/IHI0044F_aaelf.pdf
#define R_ARM_NONE 0
#define R_ARM_ABS32 2
#define R_ARM_RELATIVE 23
#define R_ARM_JUMP_SLOT 22
#define R_ARM_GLOB_DAT 21
el_status el_applyrel(el_ctx *ctx, Elf_Rel *rel)
{
uint32_t sym = ELF_R_SYM(rel->r_info); // Symbol offset
uint32_t type = ELF_R_TYPE(rel->r_info); // Relocation Type
uintptr_t *p = (uintptr_t *)(rel->r_offset + ctx->base_load_paddr); // Target Addr
#if 0 // For later symbol usage
Elf32_Sym *elfSym;
const char *symbolName;
// We resolve relocs from the originating elf-image
elfSym = (Elf32_Sym *)(ctx->symtab.sh_offset + (char *)buffteg) + sym;
int strtab_offset = ctx->shstr.sh_offset;
char *strtab = (char *)buffteg + strtab_offset;
symbolName = strtab + elfSym->st_name;
//EL_DEBUG("Str: %s sz: %x val: %x\n", symbolName, elfSym->st_size, elfSym->st_value);
#endif
switch (type)
{
case R_ARM_NONE:
EL_DEBUG("R_ARM_NONE\n");
break;
case R_ARM_JUMP_SLOT:
case R_ARM_ABS32:
case R_ARM_GLOB_DAT:
// Stubbed for later purpose
//*p += elfSym->st_value; // + vaddr from sec
//*p |= 0; // 1 if Thumb && STT_FUNC, ignored for now
break;
case R_ARM_RELATIVE: // Needed for PIE
if (sym)
{
return EL_BADREL;
}
*p += ctx->base_load_vaddr;
break;
default:
return EL_BADREL;
}
return EL_OK;
}
#endif

2
ipl/gfx.c
View file

@ -356,6 +356,8 @@ void gfx_printf(gfx_con_t *con, const char *fmt, ...)
case 'd':
_gfx_putn(con, va_arg(ap, u32), 10, fill, fcnt);
break;
case 'p':
case 'P':
case 'x':
case 'X':
_gfx_putn(con, va_arg(ap, u32), 16, fill, fcnt);

25
ipl/gfx.h
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@ -1,6 +1,7 @@
/*
* Copyright (c) 2018 naehrwert
* Copyright (C) 2018 CTCaer
* Copyright (C) 2018 M4xw
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@ -18,29 +19,7 @@
#ifndef _GFX_H_
#define _GFX_H_
#include "types.h"
typedef struct _gfx_ctxt_t
{
u32 *fb;
u32 width;
u32 height;
u32 stride;
} gfx_ctxt_t;
typedef struct _gfx_con_t
{
gfx_ctxt_t *gfx_ctxt;
u32 fntsz;
u32 x;
u32 y;
u32 savedx;
u32 savedy;
u32 fgcol;
int fillbg;
u32 bgcol;
int mute;
} gfx_con_t;
#include "../common/common_gfx.h"
void gfx_init_ctxt(gfx_ctxt_t *ctxt, u32 *fb, u32 width, u32 height, u32 stride);
void gfx_clear_grey(gfx_ctxt_t *ctxt, u8 color);

23
ipl/heap.c
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2018 naehrwert
* Copyright (c) 2018 M4xw
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@ -16,20 +17,7 @@
#include <string.h>
#include "heap.h"
typedef struct _hnode
{
int used;
u32 size;
struct _hnode *prev;
struct _hnode *next;
} hnode_t;
typedef struct _heap
{
u32 start;
hnode_t *first;
} heap_t;
#include "../common/common_heap.h"
static void _heap_create(heap_t *heap, u32 start)
{
@ -110,7 +98,7 @@ static void _heap_free(heap_t *heap, u32 addr)
}
}
static heap_t _heap;
heap_t _heap;
void heap_init(u32 base)
{
@ -122,6 +110,11 @@ void *malloc(u32 size)
return (void *)_heap_alloc(&_heap, size, 0x10);
}
void *memalign(u32 align, u32 size)
{
return (void *)_heap_alloc(&_heap, size, align);
}
void *calloc(u32 num, u32 size)
{
void *res = (void *)_heap_alloc(&_heap, num * size, 0x10);

1
ipl/heap.h
View file

@ -23,5 +23,6 @@ void heap_init(u32 base);
void *malloc(u32 size);
void *calloc(u32 num, u32 size);
void free(void *buf);
void *memalign(u32 align, u32 size);
#endif

121
ipl/main.c
View file

@ -4,6 +4,7 @@
* Copyright (c) 2018 Rajko Stojadinovic
* Copyright (c) 2018 CTCaer
* Copyright (c) 2018 Reisyukaku
* Copyright (c) 2018 M4xw
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@ -57,6 +58,13 @@
#include "bq24193.h"
#include "config.h"
#include "elfloader/elfload.h"
#include "../common/common_module.h"
// TODO: Make it not suck
FIL globalElfFile;
void *elfBuff;
//TODO: ugly.
gfx_ctxt_t gfx_ctxt;
gfx_con_t gfx_con;
@ -1719,6 +1727,113 @@ out:
btn_wait();
}
void mainApplicationCb(const char *test)
{
gfx_printf(&gfx_con, "\n%s\n\n", test);
//btn_wait();
return;
}
extern heap_t _heap;
static void call_elf_ep(moduleEntrypoint_t entrypoint)
{
pmoduleConfiguration_t moduleConfig = (pmoduleConfiguration_t)malloc(sizeof(struct moduleConfiguration_t));
moduleConfig->gfxCon = &gfx_con;
moduleConfig->gfxCtx = &gfx_ctxt;
moduleConfig->memcpy = (memcpy_t)&memcpy;
moduleConfig->memset = (memset_t)&memset;
moduleConfig->sharedHeap = &_heap;
entrypoint(mainApplicationCb, moduleConfig);
}
static void *elfAllocationCallback(
el_ctx *ctx,
Elf_Addr phys,
Elf_Addr virt,
Elf_Addr size)
{
(void)ctx;
(void)phys;
(void)size;
return (void *)virt;
}
void *buffteg = NULL;
static bool elfReadCallback(el_ctx *ctx, void *dest, size_t numberBytes, size_t offset)
{
(void)ctx;
memcpy(dest, buffteg + offset, numberBytes);
return true;
}
// TODO: ??? Add more modules!
void launch_elf()
{
gfx_clear_grey(&gfx_ctxt, 0x1B);
gfx_con_setpos(&gfx_con, 0, 0);
if (sd_mount())
{
gfx_printf(&gfx_con, "Attempting to execute: %s\n", "module_sample.so");
buffteg = sd_file_read("module_sample.so");
sd_unmount();
el_ctx ctx;
ctx.pread = elfReadCallback;
if (el_init(&ctx))
{
gfx_printf(&gfx_con, "%s\n", "Cant init ELF context");
goto elfLoadFinalOut;
}
elfBuff = memalign(ctx.align, ctx.memsz);
if (!elfBuff)
{
gfx_printf(&gfx_con, "%s\n", "Cant alloc memory");
goto elfLoadFinalOut;
}
ctx.base_load_vaddr = ctx.base_load_paddr = (uintptr_t)elfBuff;
if (el_load(&ctx, elfAllocationCallback))
{
gfx_printf(&gfx_con, "%s\n", "el_load");
goto elfFreeOut;
}
if (el_relocate(&ctx))
{
gfx_printf(&gfx_con, "%s\n", "el_relocate");
goto elfFreeOut;
}
uintptr_t epaddr = ctx.ehdr.e_entry + (uintptr_t)elfBuff;
moduleEntrypoint_t ep = (moduleEntrypoint_t)epaddr;
call_elf_ep(ep);
elfFreeOut:
free(elfBuff);
elfBuff = NULL;
}
else
{
gfx_printf(&gfx_con, "%s\n", "Cant mount SD");
goto elfLoadFinalOut;
}
elfLoadFinalOut:
btn_wait();
return;
}
void launch_firmware()
{
u8 max_entries = 61;
@ -2425,7 +2540,10 @@ void about()
" - bcl-1.2.0,\n"
" Copyright (C) 2003-2006, Marcus Geelnard\n\n"
" - Atmosphere (SE sha256, prc id patches),\n"
" Copyright (C) 2018, Atmosphere-NX\n"
" Copyright (C) 2018, Atmosphere-NX\n\n"
" - elfload,\n"
" Copyright (C) 2014, Owen Shepherd\n"
" Copyright (C) 2018, M4xw\n"
" ___________________________________________\n\n";
static const char octopus[] =
" %k___\n"
@ -2577,6 +2695,7 @@ menu_t menu_tools = {
ment_t ment_top[] = {
MDEF_HANDLER("Launch firmware", launch_firmware),
MDEF_HANDLER("Launch ELF", launch_elf),
MDEF_MENU("Launch options", &menu_options),
MDEF_CAPTION("---------------", 0xFF444444),
MDEF_MENU("Tools", &menu_tools),

31
modules/sample/Makefile Normal file
View file

@ -0,0 +1,31 @@
ifeq ($(strip $(DEVKITARM)),)
$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
endif
include $(DEVKITARM)/base_rules
TARGET := module_sample
BUILD := ../../build_ipl
OUTPUT := ../../output
OBJS = $(addprefix $(BUILD)/,\
module_sample.o \
)
LD = $(DEVKITPRO)/devkitARM/bin/arm-none-eabi-ld
ARCH := -march=armv4t -mtune=arm7tdmi -mthumb -mthumb-interwork
CUSTOMDEFINES := -D__arm__ -DARM
CFLAGS = $(ARCH) -O2 -nostdlib -std=gnu11 -fpie -Wall $(CUSTOMDEFINES)
LDFLAGS = $(ARCH) -nostartfiles -lgcc
.PHONY: clean all
all: $(TARGET).so
$(BUILD)/%.o: ./%.c
$(CC) $(CFLAGS) -c $< -o $@
$(TARGET).so: $(BUILD)/$(TARGET).o
$(LD) $(LDLAGS) -pie -entry _pluginInit $(BUILD)/$(TARGET).o -o $(OUTPUT)/$(TARGET).so
clean:
@rm -rf $(OUTPUT)/$(TARGET).so

10
modules/sample/module_sample.c Normal file
View file

@ -0,0 +1,10 @@
/* Sample Hekate Module
2018 - M4xw
*/
#include "../../common/common_module.h"
void _pluginInit(cbMainModule_t cb, pmoduleConfiguration_t mc)
{
cb("Hello World!");
}