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3 questions about linux-2.4.18 and R3000

To: linux-mips@oss.sgi.com
Subject: 3 questions about linux-2.4.18 and R3000
From: Alexandr Andreev <andreev@niisi.msk.ru>
Date: Fri, 24 May 2002 18:16:09 -0400
Organization: niisi
Sender: owner-linux-mips@oss.sgi.com
User-agent: Mozilla/5.0 (X11; U; Linux 2.4.17 i686; en-US; rv:0.9) Gecko/20010507
Hi, list.
I have three little questions with linux-2.4.18 on my machine.

My configuration is:
MIPS R3000, linux-2.4.18 kernel from CVS,
egcs-mips-linux-1.1.2-4 (egcs-2.91.66) and binutils-mips-linux-2.8.1-2

1. When i use MIPS specific arch_get_unmapped_area() function, my kernel
 hangs. It looks like this:
 ...
 Freeing unused kernel memory: 108k freed
do_page_fault() #2: sending SIGSEGV to init for illegal read access from 0fb65330 (epc == 0fb65330, ra == 0fb851dc)
 ... and so on. Last message is printed infinitely.

 So, i have to give up HAVE_ARCH_UNMAPPED_AREA feature, and to use
 common arch_get_unmapped_area() routine.

2. There is a strange code in the local_flush_tlb_page() function
 (tlb-r3k.c and tlb-r4k.c):
    ...
        if (!vma || vma->vm_mm->context != 0) {
              unsigned long flags;
              int oldpid, newpid, idx;
 #ifdef DEBUG_TLB
              printk("[tlbpage<%lu,0x%08lx>]", vma->vm_mm->context, page);
 #endif
              newpid = (vma->vm_mm->context & 0xfc0);
                        ^^^^^
 Hmm... the kernel will crash if vma ==0. I guess that this code must look
 like this:

        if (vma && vma->vm_mm->context !=0) {

 Is any patches required?

3. I have some problems, when i try to compile latest kernels with my egcs
and binutils, such as problems with "__INIT" and "__FINI" assembler macroses:

 # mips-linux-gcc -D__ASSEMBLY__ -D__KERNEL__ -I include -G 0
  -mno-abicalls -fno-pic -mcpu=r3000 -mips1 -pipe -c entry.S -o entry.o
 entry.S: Assembler messages:
 entry.S:179: Error: .previous without corresponding .section; ignored

 ... and ".macro" assembler command usage:

# mips-linux-gcc -D__ASSEMBLY__ -D__KERNEL__ -I include -G 0 -mno-abicalls -fno-pic -mcpu=r3000 -mips1 -pipe -c head.S -o head.o
 head.S: Assembler messages:
 head.S:224: Error: .size expression too complicated to fix up
 head.S:224: Error: .size expression too complicated to fix up
 head.S:224: Error: .size expression too complicated to fix up
 head.S:224: Error: .size expression too complicated to fix up
 make[1]: *** [head.o] Error 1

 I know that my binutils are obsolete and so, I tried to use some newer
binutils (2.9.5-1, 2.9.5-3), but my kernel crashed :(. Please, can you answer
  me, what egcs & binutils are suitable for linux-2.4.18 and MIPS R3000
  compliant?

 Any help will be appriciated.


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