diff options
| author | Maxim Kuvyrkov <maxim@codesourcery.com> | 2009-09-23 01:22:43 +0400 |
|---|---|---|
| committer | Geert Uytterhoeven <geert@linux-m68k.org> | 2010-02-27 18:44:10 +0100 |
| commit | 00ebfe58b002f0ff387f60c7cd23bc2b274fce1a (patch) | |
| tree | 2e88877140ddcb97cf2b5a01bbf0b3c443bf3ef9 /arch/m68k/kernel | |
| parent | a58f75349063f60949614de39390df594ba1418d (diff) | |
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 <maxim@codesourcery.com>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/kernel')
| -rw-r--r-- | arch/m68k/kernel/signal.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c index de2d05ddd86..4b387538706 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; |