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"kernel coder" <[EMAIL PROTECTED]> writes: > I modified mips backend to support stw instruction.But during the > compilation of crtstuff.c it is generating an instrucion > > stw $2,p.2249 > > as this format of instruction is not supported on assembler,an error > for illegal operands(p.2249) is being generated. > > First of all i'm not been able to understand the operand p.2249 as i'm > newbie to mips assembly.According to tc-mips.c code in GAS ,it seems > to be a 32 address,but still the syntax is not clear to me. p.2249 is simply the name of a symbol. > Where in mips backend in gcc (mips.md,mips.h,mips.c) such type of > offset(p.2249) is being generated because i need to tell the compiler > that only allowed offset for stw instruction is 16-bit and generated > format should be > > stw reg,offset(reg) The name p.2249 is most likely coming from the machine independent code. You can see names like this for a function static variable named "p". Note that all MIPS processors are restricted to 16 bit offsets in the sw instruction. Most MIPS assemblers support "sw $2,foo" by expanding it into multiple instructions. However, the compiler also supports expanding that into multiple instructions itself, which is generally better for scheduling purposes. So if you are modifying the existing MIPS backend, you should force TARGET_EXPLICIT_RELOCS to be true. Then the compiler will not normally a store word for a symbol. Ian
