Currently major user-land tools manipulating ELF objects such as binutils and GDB support an ELF extension that helps field-size shortage for some ELF header fields: e_phnum, e_shnum and e_strshndx. It's also in progress to support the ELF extension for process coredump on Linux kernel. Please refer to my post in LKML: http://lkml.org/lkml/2010/1/3/103 We therefore describe the ELF extension and its reference to the specifications in man5/elf.5. Signed-off-by: Daisuke HATAYAMA <d.hatayama@xxxxxxxxxxxxxx> --- man5/elf.5 | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 files changed, 52 insertions(+), 1 deletions(-) diff --git a/man5/elf.5 b/man5/elf.5 index 20ed3d8..e4987b8 100644 --- a/man5/elf.5 +++ b/man5/elf.5 @@ -30,7 +30,7 @@ .\" 2007-10-11, Mike Frysinger <vapier@xxxxxxxxxx>, various fixes .\" 2007-12-08, mtk, Converted from mdoc to man macros .\" -.TH ELF 5 2007-12-28 "Linux" "Linux Programmer's Manual" +.TH ELF 5 2010-01-21 "Linux" "Linux Programmer's Manual" .SH NAME elf \- format of Executable and Linking Format (ELF) files .SH SYNOPSIS @@ -543,6 +543,28 @@ in bytes. If a file has no program header, .IR e_phnum holds the value zero. +.IP +If the number of entries in the program header table is larger than or equal to +.BR PN_XNUM +(0xffff), this member holds +.BR PN_XNUM +(0xffff). The real number of entries in the program header table is held in +.IR sh_info +member of the initial entry in section header table. Otherwise, the +.IR sh_info +member of the initial entry contains the value zero. +.\" .Bl -tag -width "PN_XNUM" +.RS 12 +.TP 9 +.BR PN_XNUM +This is defined as 0xffff, the largest number +.IR e_phnum +can have, specifying where the actual number of program headers is +assigned. +.PD +.RE +.\" .El +.IP .TP .IR e_shentsize This member holds a sections header's size in bytes. @@ -561,6 +583,17 @@ If a file has no section header table, .IR e_shnum holds the value of zero. +.IP +If the number of entries in the section header table is larger than or equal to +.BR SHN_LORESERVE +(0xff00), +.IR e_shnum +holds the value zero. The real number of entries in the section header +table is held in +.IR sh_size +of the initial entry in section header table. Otherwise, the +.IR sh_size +of the initial entry in section header table holds the value zero. .TP .IR e_shstrndx This member holds the section header table index of the entry associated @@ -568,6 +601,17 @@ with the section name string table. If the file has no section name string table, this member holds the value .BR SHN_UNDEF . +.IP +If the index of section name string table section is larger than or equal to +.BR SHN_LORESERVE +(0xff00), this member holds +.BR SHN_XINDEX +(0xffff) and the real index of the section name string table section +is held in the +.IR sh_link +member of the initial entry in section header table. Otherwise, the +.IR sh_link +member of the initial entry in section header table contains the value zero. .RS 12 .\" .Bl -tag -width "SHN_LORESERVE" .TP 14 @@ -1876,3 +1920,10 @@ Santa Cruz Operation, Unix System Laboratories, "Object Files", .IR "Executable and Linking Format (ELF)" . +.PP +Sun microsystems, +.IR "Linker and Libraries Guide" . +.PP +AMD64 ABI Draft, +.IR "System V Application Binary Interface AMD64 Architecture Processor Supplement" . +.PP -- 1.6.5.1 -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
