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[Bug ld/10073] R_ARM_THM_PC8 Relocation Not Implemented in elf32-arm.c

From: JayS at spectralogic dot com
Subject: [Bug ld/10073] R_ARM_THM_PC8 Relocation Not Implemented in elf32-arm.c
Date: 4 May 2009 03:50:17 -0000

------- Additional Comments From JayS at spectralogic dot com  2009-05-04 03:50 
Subject: RE:  R_ARM_THM_PC8 Relocation Not Implemented in elf32-arm.c

Owen, Nick, et. al.,

I've been working towards the same objective and stumbled across your post.

I tried Nick's fix of 4/21 and had similar results.

I believe that there is an additional problem.

If you go to the HOWTO() macro for R_ARM_THM_PC8 (elf32-arm.c, line 235), it 
shows a shift count of one.  ARM's documentation shows that the R_ARM_THM_PC8 
relocation is only used for an LDR(3) instruction, which uses a shift count of 


LDR <Rd>, [PC, #<immed_8> * 4]


<Rd> Is the destination register for the word loaded from memory.

PC Is the program counter. Its value is used to calculate the memory address. 
Bit 1 of the PC
value is forced to zero for the purpose of this calculation, so the address is 

<immed_8> Is an 8-bit value that is multiplied by 4 and added to the value of 
the PC to form the memory

I haven't had a chance to rebuild and test it with a shift count of two.  I 
don't subscribe to the mailing list, but if you are interested in how it comes 
out, email me at jays at spectralogic dot com and I will let you know.  I'd ask 
that you do the same if you find anything out.

Thanks for the suggestions so far, and good luck.




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