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[Bug gas/2539] avr-as generates wrong opcode for call/jmp with lables

From: nickc at redhat dot com
Subject: [Bug gas/2539] avr-as generates wrong opcode for call/jmp with lables
Date: 13 Apr 2006 09:15:39 -0000

------- Additional Comments From nickc at redhat dot com  2006-04-13 09:15 
Hi Mack,

  This is not a bug, but a feature.  The AVR assembler has chosen to use a reloc
with the JMP instruction, so the actual address is not resolved until link time.
 If you disassemble the object file with -Dr instead of -D you will see:

  00000000 <main-0x46>:
   0:   0c 94 00 00     jmp     0       ; 0x0 <main-0x46>
                        0: R_AVR_CALL   .text+0x46
etc.  The reason for this is that the JMP instruction takes an absolute address
as its operand, and this address cannot be known until the linker has assigned a
location to the .text section.

The RJMP and RCALL instructions on the other hand take PC-relative operands, so
their values can be computed by the assembler at assembly time.  Hence these two
instructions do not generate relocs.


           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


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