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alexbuell
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Joined: 18 Jul 2002
Posts: 490
Location: "Hemp"shire, UK
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 Posted: Wed Dec 27, 2006 8:03 pm Post subject: Why is my 64bit executable so large? |
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My code:
| Code: |
.equ SYSCALL_EXIT, 1
.equ SYSCALL_WRITE, 4
.equ STDIN, 0
.equ STDOUT, 1
.equ STDERR, 2
.align 4
.global _start
_start:
mov STDOUT, %o0
set string, %o1
mov 14, %o2
mov SYSCALL_WRITE, %g1
ta 0x10
mov 0, %o0
mov SYSCALL_EXIT, %g1
ta 0x10
.align 4
string:
.ascii "Hello world!\n"
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How I build it:
| Code: |
as -64 -o hello.o hello.s
ld -e _start --oformat=elf64-sparc -o hello hello.o
ld: warning: sparc:v9 architecture of input file `hello.o' is
incompatible with sparc output strip hello
file hello
hello: ELF 64-bit MSB executable, SPARC V9, version 1 (SYSV),
statically linked, stripped
ls -l
total 24
-rwxr-xr-x 1 root root 66032 2006-12-26 14:39 hello
-rw-r--r-- 1 root root 1056 2006-12-26 14:39 hello.o
-rw-r--r-- 1 root root 296 2006-12-25 10:07 hello.s
-rw-r--r-- 1 root root 187 2006-12-25 10:27 Makefile
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Why is the hello executable 66,032 bytes long? Answers would be gratefully received.
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Alex.
Linux - the best text adventure game ever. |
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erik258
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Joined: 12 Apr 2005
Posts: 2650
Location: Twin Cities, Minnesota, USA
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| Posted: Thu Dec 28, 2006 6:02 am Post subject: |
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i don't know how to do that neat asm stuff, but i tried what you did and got ...(i named it as.s for some strange reason)...
dan@pascal ~ $ as -64 -o hello.o as.s
as.s: Assembler messages:
as.s:12: Error: bad register name `%o0'
as.s:13: Error: no such instruction: `set string,%o1'
as.s:14: Error: bad register name `%o2'
as.s:15: Error: bad register name `%g1'
as.s:16: Error: no such instruction: `ta 0x10'
as.s:18: Error: bad register name `%o0'
as.s:19: Error: bad register name `%g1'
as.s:20: Error: no such instruction: `ta 0x10'
dan@pascal ~ $ cat as.s
.equ SYSCALL_EXIT, 1
.equ SYSCALL_WRITE, 4
.equ STDIN, 0
.equ STDOUT, 1
.equ STDERR, 2
.align 4
.global _start
_start:
mov STDOUT, %o0
set string, %o1
mov 14, %o2
mov SYSCALL_WRITE, %g1
ta 0x10
mov 0, %o0
mov SYSCALL_EXIT, %g1
ta 0x10
.align 4
string:
.ascii "Hello world!\n"
anyway, 64bit means all the default types are now 8 bytes long . But char is still i byte long my research (printf on sizeof(char) ) leads me to believe. I assume all the registers are 64 bit and so on and so forth. I wanted to compare to size of 32bit version but couldn't assemble or whatever its called the source you posted.
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coolsnowmen
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Joined: 30 Jun 2004
Posts: 1479
Location: No.VA
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| Posted: Thu Dec 28, 2006 2:41 pm Post subject: Re: Why is my 64bit executable so large? |
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| alexbuell wrote: |
hello: ELF 64-bit MSB executable, SPARC V9, version 1 (SYSV),
statically linked, stripped
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@erik258
| Quote: | as.s: Assembler messages:
as.s:12: Error: bad register name `%o0'
as.s:13: Error: no such instruction: `set string,%o1' |
Do you have a spark?, this might not compile on a amd64/x86/emt64/IA64 machine
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erik258
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Joined: 12 Apr 2005
Posts: 2650
Location: Twin Cities, Minnesota, USA
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| Posted: Thu Dec 28, 2006 4:23 pm Post subject: |
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well all right. ; (
The thin that probably really increases the exe size is this :
| your computer wrote: | | statically linked |
unless it's not actaully linked to anything?
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alexbuell
Guru
Joined: 18 Jul 2002
Posts: 490
Location: "Hemp"shire, UK
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| Posted: Fri Dec 29, 2006 10:27 am Post subject: |
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| erik258 wrote: | well all right. ; (
The thin that probably really increases the exe size is this :
| your computer wrote: | | statically linked |
unless it's not actaully linked to anything? |
I think you might be correct, I've asked about this elsewhere. For the record, I intend to try and get 64bit userland up and running under my Ultra 2. I do have 2GB of RAM... the binutils are already able to generate 64bit code, it's the rest of the GCC tool chain that needs to build 64bit code.
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erik258
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Location: Twin Cities, Minnesota, USA
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| Posted: Fri Dec 29, 2006 9:42 pm Post subject: |
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have you ever heard of crossdev?
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alexbuell
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Joined: 18 Jul 2002
Posts: 490
Location: "Hemp"shire, UK
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| Posted: Fri Dec 29, 2006 10:49 pm Post subject: |
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| erik258 wrote: | | have you ever heard of crossdev? |
Yes, I've successfully used it to bootstrap Gentoo onto an old Pentium 166 box when the 2006.1 install disks failed to boot on it. Also to compile MS-DOG and Win32 binaries on Linux.
I will cross compile a 64 bit version of GCC on my Ultra 2 and use that to build multilibs, then build GLIBC, then a 64 bit version of GCC, if only for the fun factor. By now most of the work in porting to the AMD64/ia64 platforms should be bearing fruit.
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erik258
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Posts: 2650
Location: Twin Cities, Minnesota, USA
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| Posted: Fri Dec 29, 2006 10:56 pm Post subject: |
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i think so, if i read you correctly. I run amd64. i won't ever have an itanium so i couldn't care less about ia64.
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