build: add support for building tools targeting host machine

tools/Makefile

@@ -0,0 +1,13 @@
+TOOL_LIST := e64patch
+
+all:
+	@for prog in $(TOOL_LIST); do \
+		$(MAKE) -C $$prog; \
+	done
+
+clean:
+	@for prog in $(TOOL_LIST); do \
+		$(MAKE) -C $$prog clean; \
+	done
+
+.PHONY: all clean

tools/e64patch/Makefile

@@ -0,0 +1,4 @@
+TOOL_NAME := e64patch
+
+include ../tool-config.mk
+include ../tool-template.mk

tools/e64patch/elf.h

@@ -0,0 +1,284 @@
+#ifndef USERBOOT_ELF_H_
+#define USERBOOT_ELF_H_
+
+#include <stdint.h>
+#include <stddef.h>
+
+#define ELF_MAG0 0x7f
+#define ELF_MAG1 'E'
+#define ELF_MAG2 'L'
+#define ELF_MAG3 'F'
+#define ELF_NIDENT 16
+
+#define SHT_NONE 0
+#define SHT_PROGBITS 1
+#define SHT_SYMTAB 2
+#define SHT_STRTAB 3
+#define SHT_RELA 4
+#define SHT_DYNAMIC 6
+#define SHT_NOBITS 8
+#define SHT_REL 9
+#define SHT_DYNSYM 11
+
+/** Little endian. */
+#define ELFDATA2LSB (1)
+
+/** 64-bit. */
+#define ELFCLASS64 (2)
+
+#define EM_386 (3)
+#define EM_X86_64 (62)
+
+/** ELF current version. */
+#define EV_CURRENT (1)
+
+/** Dynamic section tags. */
+#define DT_NULL 0
+#define DT_NEEDED 1
+#define DT_PLTRELSZ 2
+#define DT_PLTGOT 3
+#define DT_HASH 4
+#define DT_STRTAB 5
+#define DT_SYMTAB 6
+#define DT_RELA 7
+#define DT_RELASZ 8
+#define DT_RELAENT 9
+#define DT_STRSZ 10
+#define DT_SYMENT 11
+#define DT_INIT 12
+#define DT_FINI 13
+#define DT_REL 17
+#define DT_RELSZ 18
+#define DT_RELENT 19
+#define DT_PLTREL 20
+#define DT_JMPREL 23
+#define DT_GNU_HASH 0x6ffffef5
+#define DT_AUXILIARY 0x7ffffffd
+
+#define R_386_32 1
+#define R_386_PC32 2
+#define R_386_GOT32 3
+#define R_386_PLT32 4
+#define R_386_GOTOFF 9
+#define R_386_GOTPC 10
+#define R_386_GOT32X 43
+
+#define R_X86_64_64 1
+#define R_X86_64_PC32 2
+#define R_X86_64_GOT32 3
+#define R_X86_64_PLT32 4
+#define R_X86_64_COPY 5
+#define R_X86_64_GLOB_DAT 6
+#define R_X86_64_JUMP_SLOT 7
+#define R_X86_64_RELATIVE 8
+#define R_X86_64_GOTPCREL 9
+#define R_X86_64_32 10
+
+#define STT_NOTYPE 0
+#define STT_OBJECT 1
+#define STT_FUNC 2
+#define STT_SECTION 3
+#define STT_FILE 4
+#define STT_LOPROC 13
+#define STT_HIPROC 15
+
+/* Section flags */
+#define SHF_WRITE 0x1
+#define SHF_ALLOC 0x2
+#define SHF_EXECINSTR 0x4
+
+#define SHN_UNDEF 0
+
+#define ELF64_R_SYM(i) ((i) >> 32)
+#define ELF64_R_TYPE(i) ((elf_word_t)(i))
+#define ELF64_ST_BIND(i) ((i) >> 4)
+#define ELF64_ST_TYPE(i) ((i)&0xf)
+
+#define STB_LOCAL 0
+#define STB_GLOBAL 1
+#define STB_WEAK 2
+#define STB_NUM 3
+
+typedef uint64_t elf_addr_t;
+typedef uint64_t elf_off_t;
+typedef uint16_t elf_half_t;
+typedef uint32_t elf_word_t;
+typedef int32_t elf_sword_t;
+typedef uint64_t elf_xword_t;
+typedef int64_t elf_sxword_t;
+
+/**
+ * ELF file header.
+ */
+typedef struct {
+    uint8_t e_ident[ELF_NIDENT];
+    elf_half_t e_type;
+    elf_half_t e_machine;
+    elf_word_t e_version;
+    elf_addr_t e_entry;
+    elf_off_t e_phoff;
+    elf_off_t e_shoff;
+    elf_word_t e_flags;
+    elf_half_t e_ehsize;
+    elf_half_t e_phentsize;
+    elf_half_t e_phnum;
+    elf_half_t e_shentsize;
+    elf_half_t e_shnum;
+    elf_half_t e_shstrndx;
+} elf_ehdr_t;
+
+/**
+ * ELF section header.
+ */
+typedef struct {
+    elf_word_t sh_name;
+    elf_word_t sh_type;
+    elf_xword_t sh_flags;
+    elf_addr_t sh_addr;
+    elf_off_t sh_offset;
+    elf_xword_t sh_size;
+    elf_word_t sh_link;
+    elf_word_t sh_info;
+    elf_xword_t sh_addralign;
+    elf_xword_t sh_entsize;
+} elf_shdr_t;
+
+/**
+ * ELF symbol.
+ */
+typedef struct {
+    elf_word_t st_name;
+    unsigned char st_info;
+    unsigned char st_other;
+    elf_half_t st_shndx;
+    elf_addr_t st_value;
+    elf_xword_t st_size;
+} elf_sym_t;
+
+/**
+ * ELF program header.
+ */
+typedef struct {
+    elf_word_t p_type;
+    elf_word_t p_flags;
+    elf_off_t p_offset;
+    elf_addr_t p_vaddr;
+    elf_addr_t p_paddr;
+    elf_xword_t p_filesz;
+    elf_xword_t p_memsz;
+    elf_xword_t p_align;
+} elf_phdr_t;
+
+/**
+ * Extended ELF relocation information.
+ */
+typedef struct {
+    elf_addr_t r_offset;
+    elf_xword_t r_info;
+    elf_sxword_t r_addend;
+} elf_rela_t;
+
+/**
+ * Dynamic section entries
+ */
+typedef struct {
+    elf_sxword_t d_tag;
+    union {
+        elf_xword_t d_val;
+        elf_addr_t d_ptr;
+    } d_un;
+} elf_dyn_t;
+
+/**
+ * Section header types.
+ */
+enum elf_stype {
+    ST_NONE = 0,
+    ST_PROGBITS = 1,
+    ST_SYMTAB = 2,
+    ST_STRTAB = 3,
+    ST_NOBITS = 8,
+    ST_REL = 9
+};
+
+/**
+ * Program header types.
+ */
+enum elf_ptype {
+    PT_NULL = 0,
+    PT_LOAD = 1,
+    PT_DYNAMIC = 2,
+    PT_INTERP = 3,
+    PT_NOTE = 4,
+    PT_SHLIB = 5,
+    PT_PHDR = 6,
+    PT_TLS = 7,
+};
+
+#define PF_X 0x1
+#define PF_W 0x2
+#define PF_R 0x4
+
+#define PT_LOPROC 0x70000000
+#define PT_HIPROC 0x7FFFFFFF
+
+/**
+ * ELF identification byte locations.
+ */
+enum elf_ident {
+    EI_MAG0 = 0,
+    EI_MAG1 = 1,
+    EI_MAG2 = 2,
+    EI_MAG3 = 3,
+    EI_CLASS = 4,
+    EI_DATA = 5,
+    EI_VERSION = 6,
+    EI_OSABI = 7,
+    EI_ABIVERSION = 8,
+    EI_PAD = 9
+};
+
+enum elf_type {
+    ET_NONE = 0,
+    ET_REL = 1,
+    ET_EXEC = 2,
+    ET_DYN = 3,
+};
+
+#define AT_NULL 0
+#define AT_IGNORE 1
+#define AT_EXECFD 2
+#define AT_PHDR 3
+#define AT_PHENT 4
+#define AT_PHNUM 5
+#define AT_PAGESZ 6
+#define AT_BASE 7
+#define AT_FLAGS 8
+#define AT_ENTRY 9
+#define AT_NOTELF 10
+#define AT_UID 11
+#define AT_EUID 12
+#define AT_GID 13
+#define AT_EGID 14
+#define AT_CLKTCK 17
+#define AT_PLATFORM 15
+#define AT_HWCAP 16
+#define AT_FPUCW 18
+#define AT_DCACHEBSIZE 19
+#define AT_ICACHEBSIZE 20
+#define AT_UCACHEBSIZE 21
+#define AT_IGNOREPPC 22
+#define AT_SECURE 23
+#define AT_BASE_PLATFORM 24
+#define AT_RANDOM 25
+#define AT_HWCAP2 26
+#define AT_EXECFN 31
+#define AT_SYSINFO 32
+#define AT_SYSINFO_EHDR 33
+#define AT_L1I_CACHESHAPE 34
+#define AT_L1D_CACHESHAPE 35
+#define AT_L2_CACHESHAPE 36
+#define AT_L3_CACHESHAPE 37
+#define AT_ENTRY_COUNT 38
+
+#endif

tools/e64patch/main.c

@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include "elf.h"
+
+int main(int argc, const char **argv)
+{
+	if (argc < 2) {
+		fprintf(stderr, "no elf file specified.\n");
+		return -1;
+	}
+
+	unsigned long pagesz = sysconf(_SC_PAGESIZE);
+
+	FILE *fp = fopen(argv[1], "r+b");
+	if (!fp) {
+		perror(argv[1]);
+		return -1;
+	}
+
+	void *p = mmap(NULL, pagesz, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(fp), 0);
+	if (p == MAP_FAILED) {
+		perror("mmap");
+		fclose(fp);
+		return -1;
+	}
+
+	elf_ehdr_t *elf = p;
+	elf->e_machine = EM_386;
+
+	munmap(p, pagesz);
+	fclose(fp);
+
+	printf("patched %s e_machine to EM_386\n", argv[1]);
+	
+	return 0;
+}

tools/tool-config.mk

@@ -0,0 +1,8 @@
+
+MAKEFILE_PATH := $(abspath $(lastword $(MAKEFILE_LIST)))
+TOOLS_DIR := $(patsubst %/,%,$(dir $(MAKEFILE_PATH)))
+
+include $(TOOLS_DIR)/make/gcc-host.mk
+
+TOOLS_BUILD_DIR := $(TOOLS_DIR)/../build/tools
+BUILD_DIR := $(TOOLS_BUILD_DIR)/$(TOOL_NAME)

tools/tool-template.mk

@@ -0,0 +1,22 @@
+BUILD_DIR := $(TOOLS_BUILD_DIR)/$(TOOL_NAME)
+
+SRC := $(wildcard *.c)
+OBJ := $(addprefix $(BUILD_DIR)/,$(SRC:.c=.o))
+
+$(BUILD_DIR)/$(TOOL_NAME): $(OBJ)
+	@mkdir -p $(@D)
+
+	@printf "    \033[1;36mHOSTLD\033[0m \033[1mtools/$(TOOL_NAME)\033[0m\n"
+	@$(CC) $< -o $@ $(CFLAGS) $(LDFLAGS)
+
+$(BUILD_DIR)/%.o: %.c
+	@printf "    \033[1;32mHOSTCC\033[0m $(TOOL_NAME)/$^\n"
+	@mkdir -p $(@D)
+
+	@$(CC) $< -o $@ -c $(CFLAGS)
+
+all: $(TOOL_NAME)
+
+clean:
+	@printf "    \033[1;93mRM\033[0m     Deleting sandbox/$(TOOL_NAME)\n"
+	@rm -rf $(BUILD_DIR)