The following patch define sigcontext ABI of ColdFire.
Once these changes are reviewed, I'll follow up with patches to GLIBC and GCC's linux-unwind.h.
Thanks, -- Maxim K. CodeSourcery
>From 998f3f07de69f51aa6d810800c8e8a685a4dec77 Mon Sep 17 00:00:00 2001 From: Maxim Kuvyrkov <[email protected]> Date: Fri, 18 Sep 2009 14:09:03 +0400 Subject: [PATCH] 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 <[email protected]> --- arch/m68k/include/asm/sigcontext.h | 6 ++++++ arch/m68k/include/asm/ucontext.h | 4 ++++ arch/m68k/kernel/signal.c | 6 ++++++ 3 files changed, 16 insertions(+), 0 deletions(-) diff --git a/arch/m68k/include/asm/sigcontext.h b/arch/m68k/include/asm/sigcontext.h index 523db2a..1320eaa 100644 --- a/arch/m68k/include/asm/sigcontext.h +++ b/arch/m68k/include/asm/sigcontext.h @@ -15,9 +15,15 @@ struct sigcontext { unsigned long sc_pc; unsigned short sc_formatvec; #ifndef __uClinux__ +# ifdef __mcoldfire__ + unsigned long sc_fpregs[2][2]; /* room for two fp registers */ + unsigned long sc_fpcntl[3]; + unsigned char sc_fpstate[16+6*8]; +# else unsigned long sc_fpregs[2*3]; /* room for two fp registers */ unsigned long sc_fpcntl[3]; unsigned char sc_fpstate[216]; +# endif #endif }; diff --git a/arch/m68k/include/asm/ucontext.h b/arch/m68k/include/asm/ucontext.h index e4e2266..00dcc51 100644 --- a/arch/m68k/include/asm/ucontext.h +++ b/arch/m68k/include/asm/ucontext.h @@ -7,7 +7,11 @@ typedef greg_t gregset_t[NGREG]; typedef struct fpregset { int f_fpcntl[3]; +#ifdef __mcoldfire__ + int f_fpregs[8][2]; +#else int f_fpregs[8*3]; +#endif } fpregset_t; struct mcontext { diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c index de2d05d..9913c2b 100644 --- a/arch/m68k/kernel/signal.c +++ b/arch/m68k/kernel/signal.c @@ -897,9 +897,15 @@ 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__ + /* move.w #,d0; trap #0 */ + err |= __put_user(0x303c0000 + __NR_rt_sigreturn, + (long __user *)(frame->retcode + 0)); +#else /* moveq #,d0; notb d0; trap #0 */ err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16), (long __user *)(frame->retcode + 0)); +#endif err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4)); if (err) -- 1.6.4
