On Tue, Jan 29, 2008 at 04:42:49PM +0530, Chetan Nanda wrote: > Hi, > I am reading linux kernel code (i386/kernel/entry.S) it contains few > assembly instruction like: > > .section __ex_table,"a" > .align 4 > .long 1b,syscall_fault > .previous > .section .fixup,"ax" > .section .rodata,"a" > .pushsection > .popsection > etc .... > > How to understand these assembly statements. Please provide me some > pointers to it. These aren't assembly instructions, but assembler/linker stuff. Run "info gas", or your favourite info viewer, and search for those words. E.g.: 7.81 `.previous' ================ This is one of the ELF section stack manipulation directives. The others are `.section' (*note Section::), `.subsection' (*note SubSection::), `.pushsection' (*note PushSection::), and `.popsection' (*note PopSection::). This directive swaps the current section (and subsection) with most recently referenced section (and subsection) prior to this one. Multiple `.previous' directives in a row will flip between two sections (and their subsections). In terms of the section stack, this directive swaps the current section with the top section on the section stack. -- Luciano Rocha <luciano@xxxxxxxxxxx> Eurotux Informática, S.A. <http://www.eurotux.com/>
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