We ported MIPS64 r2 user mode emulation. When a binary is given to
qemu-mips64, our code first check whether it is Octeon binary or not if yes
it enable Octeon specific Instructions for. The following code snippet do
this job:
>
> > diff --git a/linux-user/elfload.c b/linux-user/elfload.c
> > index 2832a33..9399e44 100644
> > --- a/linux-user/elfload.c
> > +++ b/linux-user/elfload.c
> > @@ -1662,6 +1662,11 @@ int load_elf_binary(struct linux_binprm * bprm,
> > struct target_pt_regs * regs,
> > when we load the interpreter. */
> > elf_ex = *(struct elfhdr *)bprm->buf;
> >
> > +#if defined(TARGET_MIPS64)
> > + if ((elf_ex.e_flags & EF_MIPS_MARCH) == E_MIPS_MACH_OCTEON) {
> > + info->elf_arch = 1;
> > + }
> > +#endif
> > +++ b/linux-user/main.c
> > @@ -3348,6 +3348,11 @@ int main(int argc, char **argv, char **envp)
> > if (regs->cp0_epc & 1) {
> > env->hflags |= MIPS_HFLAG_M16;
> > }
> > +#if defined(TARGET_MIPS64)
> > + if (info->elf_arch) {
> > + env->insn_flags |= INSN_OCTEON;
> > + }
> > +#endif
> > }
>
where we put elf_arch in image_info
and INSN_OCTEON is in target_mips/mips-defs.h as follows
#define INSN_LOONGSON2E 0x20000000
#define INSN_LOONGSON2F 0x40000000
#define INSN_VR54XX 0x80000000
+#define INSN_OCTEON 0x10000000
Is this solution acceptable for you?
