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What is to be updated in reginfo section coprocessor register mask?
- From: "K. Ahmed Feroz" <feroz at acmet dot com>
- To: <binutils at sources dot redhat dot com>
- Date: Sat, 24 Apr 2004 18:09:51 +0530
- Subject: What is to be updated in reginfo section coprocessor register mask?
Hi,
I have some query regarding the ".reginfo section" produced by gnu
assembler in the elf output file.
The .reginfo section contains information about general purpose
registers used in the assembly file, the coprocessor registers used in
the assembly file and some offset value for the GP register.
However, the coprocessor register mask and the value for the offset of
GP register are always initialized to 0(zero).
Is this the correct behaviour?
Secondly, if there is some relocation with respect to GP register,
should the offset of GP to be subtracted from the addend at which
relocation is to be done?
For example,
.lcomm l_var2.3,8
sw $2,l_var2.3
The opcode for the above instruction is af82c008
and relocation record is (.sbss ,R_MIPS_GPREL16)
Here we see that the 16 bit immediate value is 0xc008
Which is formed by subtracting 0x0008-0x4000 = 0xc008
If the PC location value of the l_var2.3 is 0x0008
GP Value is 0x4000
Please confirm my queries .....
Regards
K.Feroz