diff options
Diffstat (limited to 'gpxe/src/arch/i386/include/bits/elf.h')
| -rw-r--r-- | gpxe/src/arch/i386/include/bits/elf.h | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/gpxe/src/arch/i386/include/bits/elf.h b/gpxe/src/arch/i386/include/bits/elf.h new file mode 100644 index 00000000..dad9c7b8 --- /dev/null +++ b/gpxe/src/arch/i386/include/bits/elf.h @@ -0,0 +1,91 @@ +#ifndef I386_BITS_ELF_H +#define I386_BITS_ELF_H + +#include "cpu.h" + +#ifdef CONFIG_X86_64 +/* ELF Defines for the 64bit version of the current architecture */ +#define EM_CURRENT_64 EM_X86_64 +#define EM_CURRENT_64_PRESENT ( \ + CPU_FEATURE_P(cpu_info.x86_capability, LM) && \ + CPU_FEATURE_P(cpu_info.x86_capability, PAE) && \ + CPU_FEATURE_P(cpu_info.x86_capability, PSE)) + +#define ELF_CHECK_X86_64_ARCH(x) \ + (EM_CURRENT_64_PRESENT && ((x).e_machine == EM_X86_64)) +#define __unused_i386 +#else +#define ELF_CHECK_X86_64_ARCH(x) 0 +#define __unused_i386 __unused +#endif + + +/* ELF Defines for the current architecture */ +#define EM_CURRENT EM_386 +#define ELFDATA_CURRENT ELFDATA2LSB + +#define ELF_CHECK_I386_ARCH(x) \ + (((x).e_machine == EM_386) || ((x).e_machine == EM_486)) + +#define ELF_CHECK_ARCH(x) \ + ((ELF_CHECK_I386_ARCH(x) || ELF_CHECK_X86_64_ARCH(x)) && \ + ((x).e_entry <= 0xffffffffUL)) + +#ifdef IMAGE_FREEBSD +/* + * FreeBSD has this rather strange "feature" of its design. + * At some point in its evolution, FreeBSD started to rely + * externally on private/static/debug internal symbol information. + * That is, some of the interfaces that software uses to access + * and work with the FreeBSD kernel are made available not + * via the shared library symbol information (the .DYNAMIC section) + * but rather the debug symbols. This means that any symbol, not + * just publicly defined symbols can be (and are) used by system + * tools to make the system work. (such as top, swapinfo, swapon, + * etc) + * + * Even worse, however, is the fact that standard ELF loaders do + * not know how to load the symbols since they are not within + * an ELF PT_LOAD section. The kernel needs these symbols to + * operate so the following changes/additions to the boot + * loading of EtherBoot have been made to get the kernel to load. + * All of the changes are within IMAGE_FREEBSD such that the + * extra/changed code only compiles when FREEBSD support is + * enabled. + */ + +/* + * Section header for FreeBSD (debug symbol kludge!) support + */ +typedef struct { + Elf32_Word sh_name; /* Section name (index into the + section header string table). */ + Elf32_Word sh_type; /* Section type. */ + Elf32_Word sh_flags; /* Section flags. */ + Elf32_Addr sh_addr; /* Address in memory image. */ + Elf32_Off sh_offset; /* Offset in file. */ + Elf32_Size sh_size; /* Size in bytes. */ + Elf32_Word sh_link; /* Index of a related section. */ + Elf32_Word sh_info; /* Depends on section type. */ + Elf32_Size sh_addralign; /* Alignment in bytes. */ + Elf32_Size sh_entsize; /* Size of each entry in section. */ +} Elf32_Shdr; + +/* sh_type */ +#define SHT_SYMTAB 2 /* symbol table section */ +#define SHT_STRTAB 3 /* string table section */ + +/* + * Module information subtypes (for the metadata that we need to build) + */ +#define MODINFO_END 0x0000 /* End of list */ +#define MODINFO_NAME 0x0001 /* Name of module (string) */ +#define MODINFO_TYPE 0x0002 /* Type of module (string) */ +#define MODINFO_METADATA 0x8000 /* Module-specfic */ + +#define MODINFOMD_SSYM 0x0003 /* start of symbols */ +#define MODINFOMD_ESYM 0x0004 /* end of symbols */ + +#endif /* IMAGE_FREEBSD */ + +#endif /* I386_BITS_ELF_H */ |