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m68k: Allow all kernel traps to be handled via exception fixups 

This will be needed by the ARAnyM Native Feature initialization code.
Also document that the VEC_TRACE check is needed for 68020/30.

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Andreas Schwab 2008-11-18 21:25:17 +01:00 committed by Geert Uytterhoeven
parent f67080884a
commit cf6da575ad
1 changed files with 7 additions and 3 deletions
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10
arch/m68k/kernel/traps.c
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@ -58,6 +58,7 @@ asm(".text\n"
/*
* this must be called very early as the kernel might
* use some instruction that are emulated on the 060
* and so we're prepared for early probe attempts (e.g. nf_init).
*/
void __init base_trap_init(void)
{
@ -78,6 +79,7 @@ void __init base_trap_init(void)
}
vectors[VEC_BUSERR] = buserr;
vectors[VEC_ILLEGAL] = trap;
vectors[VEC_SYS] = system_call;
}
@ -1055,9 +1057,11 @@ asmlinkage void trap_c(struct frame *fp)
siginfo_t info;
if (fp->ptregs.sr & PS_S) {
if ((fp->ptregs.vector >> 2) == VEC_TRACE) {
/* traced a trapping instruction */
} else
if (fp->ptregs.vector == VEC_TRACE << 2) {
/* traced a trapping instruction on a 68020/30,
* real exception will be executed afterwards.
*/
} else if (!handle_kernel_fault(&fp->ptregs))
bad_super_trap(fp);
return;
}