diff --git a/libc/include/elf.h b/libc/include/elf.h
index 644be17..5c2503a 100644
--- a/libc/include/elf.h
+++ b/libc/include/elf.h
@@ -40,9 +40,7 @@
 #include <linux/elf.h>
 #include <linux/elf-em.h>
 
-#define ELF32_R_INFO(sym, type) ((((Elf32_Word)sym) << 8) | ((type) & 0xff))
-#define ELF64_R_INFO(sym, type) ((((Elf64_Xword)sym) << 32) | ((type) & 0xffffffff))
-
+/* http://www.sco.com/developers/gabi/latest/ch4.intro.html */
 typedef __s64 Elf32_Sxword;
 
 typedef struct {
@@ -59,6 +57,22 @@
   } a_un;
 } Elf64_auxv_t;
 
+/* http://www.sco.com/developers/gabi/latest/ch4.sheader.html */
+typedef struct {
+  Elf32_Word ch_type;
+  Elf32_Word ch_size;
+  Elf32_Word ch_addralign;
+} Elf32_Chdr;
+typedef struct {
+  Elf64_Word ch_type;
+  Elf64_Word ch_reserved;
+  Elf64_Xword ch_size;
+  Elf64_Xword ch_addralign;
+} Elf64_Chdr;
+
+typedef __u16 Elf32_Section;
+typedef __u16 Elf64_Section;
+
 typedef Elf32_Half Elf32_Versym;
 typedef Elf64_Half Elf64_Versym;
 
@@ -124,6 +138,7 @@
   Elf64_Word vna_next;
 } Elf64_Vernaux;
 
+/* http://www.sco.com/developers/gabi/latest/ch5.dynamic.html */
 #define DF_ORIGIN     0x00000001
 #define DF_SYMBOLIC   0x00000002
 #define DF_TEXTREL    0x00000004
@@ -159,6 +174,7 @@
 #define DF_1_STUB       0x04000000
 #define DF_1_PIE        0x08000000
 
+/* http://www.sco.com/developers/gabi/latest/ch5.dynamic.html */
 #define DT_BIND_NOW 24
 #define DT_INIT_ARRAY 25
 #define DT_FINI_ARRAY 26
@@ -173,42 +189,269 @@
 /* Android compressed rel/rela sections */
 #define DT_ANDROID_REL (DT_LOOS + 2)
 #define DT_ANDROID_RELSZ (DT_LOOS + 3)
-
 #define DT_ANDROID_RELA (DT_LOOS + 4)
 #define DT_ANDROID_RELASZ (DT_LOOS + 5)
 
-/* gnu hash entry */
 #define DT_GNU_HASH 0x6ffffef5
 
+/* http://www.sco.com/developers/gabi/latest/ch4.eheader.html */
+#define EI_ABIVERSION 8
+#undef EI_PAD
+#define EI_PAD 9
+
+/* http://www.sco.com/developers/gabi/latest/ch4.sheader.html */
+#define ELFCOMPRESS_ZLIB 1
+#define ELFCOMPRESS_LOOS 0x60000000
+#define ELFCOMPRESS_HIOS 0x6fffffff
+#define ELFCOMPRESS_LOPROC 0x70000000
+#define ELFCOMPRESS_HIPROC 0x7fffffff
+
+/* http://www.sco.com/developers/gabi/latest/ch4.eheader.html */
 #define ELFOSABI_SYSV 0 /* Synonym for ELFOSABI_NONE used by valgrind. */
+#define ELFOSABI_HPUX 1
+#define ELFOSABI_NETBSD 2
+#define ELFOSABI_GNU 3 /* Synonym for ELFOSABI_LINUX. */
+#define ELFOSABI_SOLARIS 6
+#define ELFOSABI_AIX 7
+#define ELFOSABI_IRIX 8
+#define ELFOSABI_FREEBSD 9
+#define ELFOSABI_TRU64 10
+#define ELFOSABI_MODESTO 11
+#define ELFOSABI_OPENBSD 12
+#define ELFOSABI_OPENVMS 13
+#define ELFOSABI_NSK 14
+#define ELFOSABI_AROS 15
+#define ELFOSABI_FENIXOS 16
+#define ELFOSABI_CLOUDABI 17
+#define ELFOSABI_OPENVOS 18
+#define ELFOSABI_ARM_AEABI 64
 
-#define PT_GNU_RELRO 0x6474e552
+/* http://www.sco.com/developers/gabi/latest/ch4.reloc.html */
+#define ELF32_R_INFO(sym, type) ((((Elf32_Word)sym) << 8) | ((type) & 0xff))
+#define ELF64_R_INFO(sym, type) ((((Elf64_Xword)sym) << 32) | ((type) & 0xffffffff))
 
+/* http://www.sco.com/developers/gabi/latest/ch4.symtab.html */
 #undef ELF_ST_TYPE
 #define ELF_ST_TYPE(x) ((x) & 0xf)
 #define ELF_ST_INFO(b,t) (((b) << 4) + ((t) & 0xf))
 #define ELF32_ST_INFO(b,t) ELF_ST_INFO(b,t)
 #define ELF64_ST_INFO(b,t) ELF_ST_INFO(b,t)
 
-#define STB_LOOS      10
-#define STB_HIOS      12
-#define STB_LOPROC    13
-#define STB_HIPROC    15
+/* http://www.sco.com/developers/gabi/latest/ch4.eheader.html */
+#define EM_S370 9
+#define EM_VPP500 17
+#define EM_960 19
+#define EM_V800 36
+#define EM_FR20 37
+#define EM_RH32 38
+#define EM_RCE 39
+#define EM_FAKE_ALPHA 41
+#define EM_TRICORE 44
+#define EM_ARC 45
+#define EM_H8_300H 47
+#define EM_H8S 48
+#define EM_H8_500 49
+#define EM_MIPS_X 51
+#define EM_COLDFIRE 52
+#define EM_68HC12 53
+#define EM_MMA 54
+#define EM_PCP 55
+#define EM_NCPU 56
+#define EM_NDR1 57
+#define EM_STARCORE 58
+#define EM_ME16 59
+#define EM_ST100 60
+#define EM_TINYJ 61
+#define EM_PDSP 63
+#define EM_PDP10 64
+#define EM_PDP11 65
+#define EM_FX66 66
+#define EM_ST9PLUS 67
+#define EM_ST7 68
+#define EM_68HC16 69
+#define EM_68HC11 70
+#define EM_68HC08 71
+#define EM_68HC05 72
+#define EM_SVX 73
+#define EM_ST19 74
+#define EM_VAX 75
+#define EM_JAVELIN 77
+#define EM_FIREPATH 78
+#define EM_ZSP 79
+#define EM_MMIX 80
+#define EM_HUANY 81
+#define EM_PRISM 82
+#define EM_AVR 83
+#define EM_FR30 84
+#define EM_D10V 85
+#define EM_D30V 86
+#define EM_V850 87
+#define EM_MN10200 90
+#define EM_PJ 91
+#define EM_ARC_COMPACT 93
+#define EM_XTENSA 94
+#define EM_VIDEOCORE 95
+#define EM_TMM_GPP 96
+#define EM_NS32K 97
+#define EM_TPC 98
+#define EM_SNP1K 99
+#define EM_ST200 100
+#define EM_IP2K 101
+#define EM_MAX 102
+#define EM_CR 103
+#define EM_F2MC16 104
+#define EM_MSP430 105
+#define EM_SE_C33 107
+#define EM_SEP 108
+#define EM_ARCA 109
+#define EM_UNICORE 110
+#define EM_EXCESS 111
+#define EM_DXP 112
+#define EM_CRX 114
+#define EM_XGATE 115
+#define EM_C166 116
+#define EM_M16C 117
+#define EM_DSPIC30F 118
+#define EM_CE 119
+#define EM_M32C 120
+#define EM_TSK3000 131
+#define EM_RS08 132
+#define EM_SHARC 133
+#define EM_ECOG2 134
+#define EM_SCORE7 135
+#define EM_DSP24 136
+#define EM_VIDEOCORE3 137
+#define EM_LATTICEMICO32 138
+#define EM_SE_C17 139
+#define EM_TI_C2000 141
+#define EM_TI_C5500 142
+#define EM_MMDSP_PLUS 160
+#define EM_CYPRESS_M8C 161
+#define EM_R32C 162
+#define EM_TRIMEDIA 163
+#define EM_QDSP6 164
+#define EM_8051 165
+#define EM_STXP7X 166
+#define EM_NDS32 167
+#define EM_ECOG1 168
+#define EM_ECOG1X 168
+#define EM_MAXQ30 169
+#define EM_XIMO16 170
+#define EM_MANIK 171
+#define EM_CRAYNV2 172
+#define EM_RX 173
+#define EM_METAG 174
+#define EM_MCST_ELBRUS 175
+#define EM_ECOG16 176
+#define EM_CR16 177
+#define EM_ETPU 178
+#define EM_SLE9X 179
+#define EM_L10M 180
+#define EM_K10M 181
+#define EM_AVR32 185
+#define EM_STM8 186
+#define EM_TILE64 187
+#define EM_CUDA 190
+#define EM_CLOUDSHIELD 192
+#define EM_COREA_1ST 193
+#define EM_COREA_2ND 194
+#define EM_ARC_COMPACT2 195
+#define EM_OPEN8 196
+#define EM_RL78 197
+#define EM_VIDEOCORE5 198
+#define EM_78KOR 199
+#define EM_56800EX 200
+#define EM_BA1 201
+#define EM_BA2 202
+#define EM_XCORE 203
+#define EM_MCHP_PIC 204
+#define EM_INTEL205 205
+#define EM_INTEL206 206
+#define EM_INTEL207 207
+#define EM_INTEL208 208
+#define EM_INTEL209 209
+#define EM_KM32 210
+#define EM_KMX32 211
+#define EM_KMX16 212
+#define EM_KMX8 213
+#define EM_KVARC 214
+#define EM_CDP 215
+#define EM_COGE 216
+#define EM_COOL 217
+#define EM_NORC 218
+#define EM_CSR_KALIMBA 219
+#define EM_Z80 220
+#define EM_VISIUM 221
+#define EM_FT32 222
+#define EM_MOXIE 223
+#define EM_AMDGPU 224
+#define EM_RISCV 243
 
-#define SHT_LOOS    0x60000000
-#define SHT_HIOS    0x6fffffff
+/* http://www.sco.com/developers/gabi/latest/ch4.eheader.html */
+#define ET_LOOS 0xfe00
+#define ET_HIOS 0xfeff
 
-#define STN_UNDEF     0
+/* http://www.sco.com/developers/gabi/latest/ch4.sheader.html */
+#define GRP_COMDAT 0x1
+#define GRP_MASKOS   0x0ff00000
+#define GRP_MASKPROC 0xf0000000
 
+/* http://www.sco.com/developers/gabi/latest/ch5.pheader.html */
+#define PF_X 0x1
+#define PF_W 0x2
+#define PF_R 0x4
+#define PF_MASKOS   0x0ff00000
+#define PF_MASKPROC 0xf0000000
+
+#define PT_GNU_RELRO 0x6474e552
+
+#define STB_LOOS 10
+#define STB_HIOS 12
+#define STB_LOPROC 13
+#define STB_HIPROC 15
+
+/* http://www.sco.com/developers/gabi/latest/ch4.sheader.html */
+#define SHF_MERGE 0x10
+#define SHF_STRINGS 0x20
+#define SHF_INFO_LINK 0x40
+#define SHF_LINK_ORDER 0x80
+#define SHF_OS_NONCONFORMING 0x100
+#define SHF_GROUP 0x200
+#define SHF_TLS 0x400
+#define SHF_COMPRESSED 0x800
+#define SHF_MASKOS 0x0ff00000
+#define SHF_MASKPROC 0xf0000000
+
+/* http://www.sco.com/developers/gabi/latest/ch4.sheader.html */
+#define SHN_LOOS 0xff20
+#define SHN_HIOS 0xff3f
+#define SHN_XINDEX 0xffff
+
+/* http://www.sco.com/developers/gabi/latest/ch4.sheader.html */
+#define SHT_INIT_ARRAY 14
+#define SHT_FINI_ARRAY 15
+#define SHT_PREINIT_ARRAY 16
+#define SHT_GROUP 17
+#define SHT_SYMTAB_SHNDX 18
+#undef SHT_NUM
+#define SHT_NUM 19
+#define SHT_LOOS 0x60000000
+#define SHT_HIOS 0x6fffffff
+
+/* http://www.sco.com/developers/gabi/latest/ch4.symtab.html */
+#define STN_UNDEF 0
+
+/* http://www.sco.com/developers/gabi/latest/ch4.symtab.html */
 #define STT_GNU_IFUNC 10
-#define STT_LOOS      10
-#define STT_HIOS      12
-#define STT_LOPROC    13
-#define STT_HIPROC    15
+#define STT_LOOS 10
+#define STT_HIOS 12
+#define STT_LOPROC 13
+#define STT_HIPROC 15
 
-#define STV_DEFAULT   0
-#define STV_INTERNAL  1
-#define STV_HIDDEN    2
+/* http://www.sco.com/developers/gabi/latest/ch4.symtab.html */
+#define STV_DEFAULT 0
+#define STV_INTERNAL 1
+#define STV_HIDDEN 2
 #define STV_PROTECTED 3
 
 /* The kernel uses NT_PRFPREG but glibc also offers NT_FPREGSET */
@@ -221,7 +464,7 @@
 #define VER_FLG_BASE 0x1
 #define VER_FLG_WEAK 0x2
 
-#define VER_NDX_LOCAL  0
+#define VER_NDX_LOCAL 0
 #define VER_NDX_GLOBAL 1
 
 #endif /* _ELF_H */