Essentially, you need to ensure that
the jalr $25 below calls (jumps with lr) soft_fixup_trampoline, which
is a symbol in the text segment.
Upon entry $25 points to mips_do_fixup_trampoline. lw $25, -4($25)
loads the address of soft_fixup_trampoline in $25 to which jalr $25
then jumps. This is so because it is stored in the text segment right
before mips_do_fixup_trampoline.
Now if your assembler doesn't like words in the text segment,
it seems like doing something like:
lui $25,soft_fixup_trampoline(high)
ori $25,$25,soft_fixup_trampoline(low)
jalr $25
or
lui $25,high(soft_fixup_trampoline)
ori $25,$25,low(soft_fixup_trampoline)
jalr $25
(? I don't know MIPS assembler syntax) should work too.
See mips/jit.h.
Btw, it seems as though the first "sw $31, 0($sp) is superfluous.
- Godmar
>
>
>
> In the process of re-adapting kaffe for SGI Irix 6.x I've run into a
> problem with the trampoline definition. It seems that the lines:
>
> sw $31, 0($sp) \n
> l1: .word " C_FUNC_NAME(soft_fixup_trampoline) " \n
> .globl mips_do_fixup_trampoline \n
> .ent mips_do_fixup_trampoline \n
> mips_do_fixup_trampoline: \n
>
> cause a problem with the SGI assembler in which it refuses to compile
> with the following error:
>
> /bin/sh ../../../libtool --mode=compile gcc -DHAVE_CONFIG_H -I. -I.
>-I../../../config -I../../../include -I../../../kaffe/kaffevm/systems/unix-jthreads
>-I.. -I./.. -DTRANSLATOR -DJIT3 -DKVER='"1.0.5"'
>-I/home/canada2/leei/src/gcc/kaffe-cvs/./kaffe/kaffevm
>-I/home/canada2/leei/src/gcc/kaffe-cvs/./kaffe/kaffevm/systems/unix-jthreads
>-I../../../config -I../../../include -I/usr/local/include -g -O2 -Wall
>-Wstrict-prototypes -c -o machine.lo machine.c
> gcc -DHAVE_CONFIG_H -I. -I. -I../../../config -I../../../include
>-I../../../kaffe/kaffevm/systems/unix-jthreads -I.. -I./.. -DTRANSLATOR -DJIT3
>-DKVER=\"1.0.5\" -I/home/canada2/leei/src/gcc/kaffe-cvs/./kaffe/kaffevm
>-I/home/canada2/leei/src/gcc/kaffe-cvs/./kaffe/kaffevm/systems/unix-jthreads
>-I../../../config -I../../../include -I/usr/local/include -g -O2 -Wall
>-Wstrict-prototypes -c machine.c -DPIC -Wp,-MD,.deps/machine.TPlo -o machine.lo
> as: Error: /var/tmp/cc0Bxeo8.s, line 12706: Cannot use data-generating directives in
>the .text section.: .word
> as: Error: /var/tmp/cc0Bxeo8.s, line 12706: Cannot use data-generating directives in
>the .text section.: .word
> make[3]: *** [machine.lo] Error 1
>
> Is there some documentation as to what this functions is *expected* to
> do or some other means by which it can be achieved? Given context,
> I'm sure I can fix it, I just don't have time to track down that
> context from the sources.
>
> -------------------------------------------------------------------------------
> Lee Iverson SRI International
> [EMAIL PROTECTED] 333 Ravenswood Ave., Menlo Park CA 94025
> http://www.ai.sri.com/~leei/ (650) 859-3307
>
