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Altera_Forum
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http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/mad.gif  

movia at,((90057600)/115200) 

28: 00400034 movhi at,0 

2c: 0840c354 ori at,at,781 

movia at,((90000000+57600)/115200) 

30: 00415774 movhi at,1373 

34: 0852a014 ori at,at,19072
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Altera_Forum
Honored Contributor II
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I just tried assembling the following code: 

       .set noat        movia at,((90000000+57600)/115200) 

with the command line: 

nios2-elf-gcc -c -o test.o test.s nios2-elf-objdump -S test.o 

And got a pair of instructions which load up the value 781 (decimal). 

 

Which version of the tools are you using?
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Altera_Forum
Honored Contributor II
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Test code as following:# ==================================== 

.set noat 

_start: 

movia at,((90000000+57600)/115200) 

movia at,((90057600)/115200) 

.end# ==================================== 

I got these result: 

[NIOS2 GNU Shell]$ nios2-elf-gcc -c -o test.o test.S 

[NIOS2 GNU Shell]$ nios2-elf-objdump -S test.o 

test.o: file format elf32-littlenios2 

Disassembly of section .text: 

00000000 <_start>: 

0: 00415774 movhi at,1373 

4: 0852a014 ori at,at,19072 

8: 00400034 movhi at,0 

c: 0840c354 ori at,at,781 

[NIOS2 GNU Shell]$ 

 

Why?
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Altera_Forum
Honored Contributor II
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but , got the result with these cmd line: 

[NIOS2 GNU Shell]$ nios2-elf-as -o test.o test.S 

[NIOS2 GNU Shell]$ nios2-elf-objdump -S test.o 

test.o: file format elf32-littlenios2 

Disassembly of section .text: 

00000000 <_start>: 

0: 00400034 movhi at,0 

4: 0840c344 addi at,at,781 

8: 00400034 movhi at,0 

c: 0840c344 addi at,at,781 

/cygdrive/g/nios2/src/boot_loader 

[NIOS2 GNU Shell]$
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Altera_Forum
Honored Contributor II
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--- Quote Start ---  

originally posted by simon.embed@Mar 16 2005, 10:01 AM 

test code as following:# ==================================== 

.set noat 

_start: 

movia at,((90000000+57600)/115200) 

movia at,((90057600)/115200) 

.end# ==================================== 

i got these result: 

[nios2 gnu shell]$ nios2-elf-gcc -c -o test.o test.s 

[nios2 gnu shell]$ nios2-elf-objdump -s test.o 

test.o:    file format elf32-littlenios2 

disassembly of section .text: 

00000000 <_start>: 

  0:  00415774        movhi  at,1373 

  4:  0852a014        ori    at,at,19072 

  8:  00400034        movhi  at,0 

  c:  0840c354        ori    at,at,781 

[nios2 gnu shell]$ 

 

why? 

--- Quote End ---  

 

What version are you running? If you type nios2-elf-gcc -v this will tell you. 

 

Using your file  

 

.set noat 

_start: 

movia at,((90000000+57600)/115200) 

movia at,((90057600)/115200) 

.end 

 

With the command lines below I get exactly what you&#39;d expect 

 

[SOPC Builder]$ nios2-elf-gcc -c -o test.o test.S 

/cygdrive/d 

[SOPC Builder]$ nios2-elf-objdump -S test.o 

 

test.o: file format elf32-littlenios2 

 

Disassembly of section .text: 

 

00000000 <_start>: 

0: 00400034 movhi at,0 

4: 0840c344 addi at,at,781 

8: 00400034 movhi at,0 

c: 0840c344 addi at,at,781
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Altera_Forum
Honored Contributor II
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Thanks, rugbybloke. I got it. I have included some head file(#include "macros.h") in source file, which get wrong. Instruction MOVIA was redefined in that head file!

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Altera_Forum
Honored Contributor II
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maybe the compiler bug for the following test code:# test.S# define ALT_CPU_FREQ 90000000# define BAUD_RATE 2400 //1200# define C_DIVISOR ((ALT_CPU_FREQ+BAUD_RATE/2)/BAUD_RATE) 

.equ A_DIVISOR , ((ALT_CPU_FREQ+BAUD_RATE/2)/BAUD_RATE) 

 

.macro MOVUIK32 _reg,_val 

.if (\_val >>16) == 0 

MOVUI \_reg,%lo(\_val) 

.elseif (\_val <<16) == 0 

MOVHI \_reg,%hi(\_val) 

.else 

MOVIA \_reg,\_val 

.endif 

.endm 

 

.section .text 

.align 2 

.set noat 

_start: 

MOVUIK32 r2,C_DIVISOR 

MOVUIK32 r3,A_DIVISOR 

.end 

 

You may change the valu of ALT_CPU_FREQ and BAUD_RATE macros, and then check the compiling result!
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