--- arch/m68k/kernel/signal.c | 24 +++++++++++++++++++++++- arch/m68k/kernel/traps.c | 21 ++++++++++++--------- arch/m68k/mm/fault.c | 16 +--------------- include/asm-m68k/processor.h | 2 ++ 4 files changed, 38 insertions(+), 25 deletions(-) --- a/arch/m68k/kernel/signal.c +++ b/arch/m68k/kernel/signal.c @@ -42,6 +42,7 @@ #include #include #include +#include #include #include @@ -53,7 +54,7 @@ asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs); -const int frame_extra_sizes[16] = { +static const int frame_extra_sizes[16] = { [1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */ [2] = sizeof(((struct frame *)0)->un.fmt2), [3] = sizeof(((struct frame *)0)->un.fmt3), @@ -71,6 +72,27 @@ const int frame_extra_sizes[16] = { [15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */ }; +int handle_kernel_fault(struct pt_regs *regs) +{ + const struct exception_table_entry *fixup; + struct pt_regs *tregs; + + /* Are we prepared to handle this kernel fault? */ + fixup = search_exception_tables(regs->pc); + if (!fixup) + return 0; + + /* Create a new four word stack frame, discarding the old one. */ + regs->stkadj = frame_extra_sizes[regs->format]; + tregs = (struct pt_regs *)((long)regs + regs->stkadj); + tregs->vector = regs->vector; + tregs->format = 0; + tregs->pc = fixup->fixup; + tregs->sr = regs->sr; + + return 1; +} + /* * Atomically swap in the new signal mask, and wait for a signal. */ --- a/arch/m68k/kernel/traps.c +++ b/arch/m68k/kernel/traps.c @@ -48,10 +48,7 @@ asmlinkage void nmihandler(void); asmlinkage void fpu_emu(void); #endif -e_vector vectors[256] = { - [VEC_BUSERR] = buserr, - [VEC_SYS] = system_call, -}; +e_vector vectors[256]; /* nmi handler for the Amiga */ asm(".text\n" @@ -61,10 +58,11 @@ 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) { - if(MACH_IS_SUN3X) { + if (MACH_IS_SUN3X) { extern e_vector *sun3x_prom_vbr; __asm__ volatile ("movec %%vbr, %0" : "=r" (sun3x_prom_vbr)); @@ -79,6 +77,10 @@ void __init base_trap_init(void) vectors[VEC_UNIMPII] = unimp_vec; } + + vectors[VEC_BUSERR] = buserr; + vectors[VEC_ILLEGAL] = trap; + vectors[VEC_SYS] = system_call; } void __init trap_init (void) @@ -1058,10 +1060,11 @@ 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 */ - current->ptrace |= PT_DTRACE; - } 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; } --- a/arch/m68k/mm/fault.c +++ b/arch/m68k/mm/fault.c @@ -18,7 +18,6 @@ #include extern void die_if_kernel(char *, struct pt_regs *, long); -extern const int frame_extra_sizes[]; /* in m68k/kernel/signal.c */ int send_fault_sig(struct pt_regs *regs) { @@ -35,21 +34,8 @@ int send_fault_sig(struct pt_regs *regs) force_sig_info(siginfo.si_signo, &siginfo, current); } else { - const struct exception_table_entry *fixup; - - /* Are we prepared to handle this kernel fault? */ - if ((fixup = search_exception_tables(regs->pc))) { - struct pt_regs *tregs; - /* Create a new four word stack frame, discarding the old - one. */ - regs->stkadj = frame_extra_sizes[regs->format]; - tregs = (struct pt_regs *)((ulong)regs + regs->stkadj); - tregs->vector = regs->vector; - tregs->format = 0; - tregs->pc = fixup->fixup; - tregs->sr = regs->sr; + if (handle_kernel_fault(regs)) return -1; - } //if (siginfo.si_signo == SIGBUS) // force_sig_info(siginfo.si_signo, --- a/include/asm-m68k/processor.h +++ b/include/asm-m68k/processor.h @@ -127,4 +127,6 @@ unsigned long get_wchan(struct task_stru #define cpu_relax() barrier() +extern int handle_kernel_fault(struct pt_regs *regs); + #endif