From 00ebfe58b002f0ff387f60c7cd23bc2b274fce1a Mon Sep 17 00:00:00 2001 From: Maxim Kuvyrkov Date: Wed, 23 Sep 2009 01:22:43 +0400 Subject: m68k: Define sigcontext ABI of ColdFire The following patch defines sigcontext ABI of ColdFire. Due to ISA restrictions ColdFire needs different rt_sigreturn trampoline. And due to ColdFire FP registers being 8-bytes instead of 12-bytes on m68k, sigcontext and fpregset structures should be updated. Regarding the sc_fpstate[16+6*8] field, it would've been enough 16 bytes to store ColdFire's FP state. To accomodate GLIBC's libSegFault it would'be been enough 6*8 bytes (room for the 6 non-call-clobbered FP registers). I set it to 16+6*8 to provide some extra space for any future changes in the ColdFire FPU. Signed-off-by: Maxim Kuvyrkov Signed-off-by: Geert Uytterhoeven --- arch/m68k/kernel/signal.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'arch/m68k/kernel') diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c index de2d05d..4b38753 100644 --- a/arch/m68k/kernel/signal.c +++ b/arch/m68k/kernel/signal.c @@ -897,10 +897,17 @@ static void setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info, /* Set up to return from userspace. */ err |= __put_user(frame->retcode, &frame->pretcode); +#ifdef __mcoldfire__ + /* movel #__NR_rt_sigreturn,d0; trap #0 */ + err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0)); + err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16), + (long __user *)(frame->retcode + 4)); +#else /* moveq #,d0; notb d0; trap #0 */ err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16), (long __user *)(frame->retcode + 0)); err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4)); +#endif if (err) goto give_sigsegv; -- cgit v1.1