mips gcc 编译
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MIPS Assembly Programming Guide
The MIPS
is a RISC microprocessor. It is small, powerful, and standard on many
embedded system and advanced computing systems (Corporations such as SGI, NEC and
MIPS technology still produced them in large quantities). The MIPS
assembly often
frustrates new users with its unfamiliar sequence of operation. Hereby I provide
a startup kit for the newbies to quickly master the art of programming MIPS
processors in assembly.
Entering the MIPS World
First, we start with a simple assembly file and show how it could be compiled in
the R2000 format in a R10000 plus machine equipped with IRIX operating system.
Users who doesn't have a MIPS machine at hand can use the freely available SPIM
(with X Window and Windows support) to simulate MIPS R2000.
.ent main
.globl main
main:
li $3, 1
li $2, 2
addu $4, $2, $3
.end main
We named this file as "test.s" which does do anything other then adding two
general register ($2, $3) together and store the result into another register
($4).
Other than that, there are two menomics for assembly language including the
".ent" and ".end" command denoting the begining and end of an function object
(entity).
After that, we can assembly it and link it into an executable ELF file.
Here is the command sequence:
as -mips1 test.s -n32 -o test_4.o
ld -L/usr/lib32/mips4 -L/usr/lib32 /usr/lib32/mips4/crt1.o test_4.o -
lc /usr/lib32/mips4/crtn.o
Some brief explanation: "as" is the standalone assembler provided by the SGI MIPS
C compiler suite. We use "-mips
1" to generate the R2000 compatible code which are
easier to analyze. R2000 is the standard RISC processor covered in computer
architecture textbook. Then -n32 generate a (new) 32-bit object which are
required for the (new) linker editor we used. This will produce a warning since
(new) object are usually used together with "-mips3" or "-mips4".
Then we use the linker editor "ld" provided. We linked the object file with the
mips4 compatible library since most machines doesn't have older library.
页码，1/4MIPS Assembly Programming Guide
2007-8-15http://www.ece.neu.edu/~xzhu/mips.html
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