What are .s files in arch/i386/boot
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What are .s files in
arch/i386/boot, are they c sources of some sort? Where can I find the specifications documents they were made from?There are not c files.
They are assembler filesTry running gcc on a c file with the -S option it will generate the same then you can tweak the assembler produced to make it faster.
James
Where can I find the .c files they were made from, and the spec sheets the .c files were made from?
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What are .s files in
arch/i386/boot, are they c sources of some sort? Where can I find the specifications documents they were made from?There are not c files.
They are assembler files
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Try running gcc on a c file with the -S option it will generate the same then you can tweak the assembler produced to make it faster.
Where can I find the .c files they were made from, and the spec sheets the .c files were made from?
You would have to find the original author of the person who tweaks the assembler in the .s file chances are the .c file is long gone though.
Why do all .c files have to be generated from a spec sheet ?
Quoted 10 lines · James Stevenson
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What are .s files in
arch/i386/boot, are they c sources of some sort? Where can I find the specifications documents they were made from?There are not c files.
They are assembler filesTry running gcc on a c file with the -S option it will generate the same then you can tweak the assembler produced to make it faster.
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Where can I find the .c files they were made from, and the spec sheets the .c files were made from?
You would have to find the original author of the person who tweaks the assembler in the .s file chances are the .c file is long gone though.
If there were ever C files to begin with. It's not unheard-of for people to write assembler code from scratch.
Followup to: <[email protected]> By author: Sean Neakums <[email protected]> In newsgroup: linux.dev.kernel
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Quoted 13 lines · James Stevenson
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What are .s files in
arch/i386/boot, are they c sources of some sort? Where can I find the specifications documents they were made from?There are not c files.
They are assembler filesTry running gcc on a c file with the -S option it will generate the same then you can tweak the assembler produced to make it faster.
Where can I find the .c files they were made from, and the spec sheets the .c files were made from?
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You would have to find the original author of the person who tweaks the assembler in the .s file chances are the .c file is long gone though.
If there were ever C files to begin with. It's not unheard-of for people to write assembler code from scratch.
The ones in the Linux kernel were all written from scratch.
-hpa
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<[email protected]> at work, <[email protected]> in private! "Unix gives you enough rope to shoot yourself in the foot." Architectures needed: ia64 m68k mips64 ppc ppc64 s390 s390x sh v850 x86-64
Quoted 15 lines · H. Peter Anvin
Followup to: <[email protected]> By author: Sean Neakums <[email protected]> In newsgroup: linux.dev.kernelQuoted 11 lines
Quoted 10 lines · James Stevenson
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What are .s files in
arch/i386/boot, are they c sources of some sort? Where can I find the specifications documents they were made from?There are not c files.
They are assembler filesWhere can I find the .c files they were made from, and the spec sheets the .c files were made from?
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You would have to find the original author of the person who tweaks the assembler in the .s file chances are the .c file is long gone though.
If there were ever C files to begin with. It's not unheard-of for people to write assembler code from scratch.
The ones in the Linux kernel were all written from scratch.
And for a very good reason. A few things really need asm, for example getting a CPU in protected mode, setting up the MMU and stuff. Once they are set up, you can use C, though sometimes you must be really sure what your compiler will make from the C.
So, why assembly ? Cause it is needed. Why in arch/i386/boot ? for if it is well done there, it isn't needed at many other locations. A few things will still require asm though, therefore you'll find more .s files in arch/i386.
Jos
Not that it's a bad thing or anything, but holy crap! I didn't think there was this level of hand-holding on this list.
It's nice to see folks willing to tutor, but really, don't get burned out. This list is probably better suited to handling deeper questions.
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Quoted 15 lines · H. Peter Anvin
Followup to: <[email protected]> By author: Sean Neakums <[email protected]> In newsgroup: linux.dev.kernelQuoted 11 lines
Quoted 10 lines · James Stevenson
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What are .s files in
arch/i386/boot, are they c sources of some sort? Where can I find the specifications documents they were made from?There are not c files.
They are assembler filesWhere can I find the .c files they were made from, and the spec sheets the .c files were made from?
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You would have to find the original author of the person who tweaks the assembler in the .s file chances are the .c file is long gone though.
If there were ever C files to begin with. It's not unheard-of for people to write assembler code from scratch.
The ones in the Linux kernel were all written from scratch.
And for a very good reason. A few things really need asm, for example getting a CPU in protected mode, setting up the MMU and stuff. Once they are set up, you can use C, though sometimes you must be really sure what your compiler will make from the C.
So, why assembly ? Cause it is needed. Why in
arch/i386/boot? for if it is well done there, it isn't needed at many other locations. A few things will still require asm though, therefore you'll find more .s files inarch/i386.Jos
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Quoted 4 lines · Lars Unin
Quoted 3 lines · James Stevenson
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What are .s files in
arch/i386/boot, are they c sources of some sort? Where can I find the specifications documents they were made from?
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There are not c files.
They are assembler filesTry running gcc on a c file with the -S option it will generate the same then you can tweak the assembler produced to make it faster.
Where can I find the .c files they were made from,
Those files are smallish routines that can't be sanely written in C, or (in the case of the bootstrap stuff) are for running on the 8086 your latest CPU thinks it is when booting. No support for that from gcc.
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and the spec sheets the .c files were made from?
If they where around once, they have been long plastered over by patches that make them useless now.
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You would have to find the original author of the person who tweaks the assembler in the .s file chances are the .c file is long gone though.
Probably never was. Only way out is as they say: "Use the source, Luke".
You'd better get a book on ia32 (caution, the intel sytax almost all are written for is truly bletcherous, and does things just different enough from the AT&T sytax gcc/the kernel uses to make your head spin when trying to map back and forth). There was an HOWTO on assembly language programming under Linux, haven't looked at it in a long time.
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Why do all .c files have to be generated from a spec sheet ?
Now that is a good question... never used one in my life :-)
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