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回复 #7 迷失的人 的帖子
文章寫得很好,我給貼過來了
On Wed, Sep 10, 2003 at 01:07:25PM -0700, garret.spears wrote:
> Refernce:
> gcc-2.95.3 -m5200 -x assembler led.S
Before you compile an assembly source file, you should decide whether
you want to pass it through the C preprocessor (CPP) or not. If you
decide to use the preprocessor then you should name your source-file
"something.S" (capital "S"); if not, then you should name it
"something.s" (lowcase "s"). Provided that you follow this convention
you don't *have* to specify the source-language explicitly using the
"-x <lang>" option; gcc can figure-it out from the filename
extension. If you don't want to or can't use this naming convention,
then "-x <lang>" is required:
gcc-2.95.3 -m5200 asmcode.s -o asmcode.o
gcc-2.95.3 -m5200 -x assembler asmcode.asm -o asmcode.o
Compile without passing the source through CPP.
gcc-2.95.3 -m5200 asmcode1.S -o asmcode1.o
gcc-2.95.3 -m5200 -x assembler-with-cpp asmcode1.asm -o asmcode1.o
Pass the source through CPP and then compile.
If you decide to pass your assembly through CPP, then (and only then)
you *can* use all the C preprocessor goodies, like "#define",
"#include", "#ifdef", etc. But remember: these are handled by the
preprocessor *not* the assmebler!
>
> #DEFINE INIT_SECTION_ASM_OP // is this a requird line or should ther be
> another?
>
This is neither required nor allowed! First: you're not using
"assembler-with-cpp" so #DEFINE has no sense! Second: Even if you used
it, CPP is CaSe-SeNsItIvE, so it should be "#define" and not "#DEFINE"
> // Base addr of internal resources & SIM resources
> MBAR EQU 0x10000000 // alt I have seen ".set
What you should have said is (observe the dot!):
MBAR .EQU 0x10000000
Which is the same as saying
#define MBAR 0x10000000
>
> Should I be using a dot h file for some of this and a dot s file for my
> actual assembly coding?
>
You can use ".h" files (and the respective "#include" directives) only
if you pass your assembly through CPP. You don't *have* to use them,
though!
> Essentially when I did this years
> ago I dedicated a section to defines or equates, a section to data space,
> and a section to code - assembly language.
data section:
.data
... contents of the data-section ...
code section:
.text
... contents of the text-section ...
or if you use an object-format that can support arbitrarily-named
sections:
.section ".data"
... contents of the data-section ...
.section ".text"
... contents of the text-section ...
You don't need a section for the "equ"s since they produce no output!
Hope this helps
/npat
--
As for systems that are not like Unix, such as MSDOS, Windows, the
Macintosh, VMS, and MVS, supporting them is usually so much work that
it is better if you don't.
-- Richard Stallman "GNU Coding Standards" |
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