diff options
Diffstat (limited to 'arch')
-rw-r--r-- | arch/m68k/kernel/traps.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/arch/m68k/kernel/traps.c b/arch/m68k/kernel/traps.c index 89362f2bb56a..a76452ca964e 100644 --- a/arch/m68k/kernel/traps.c +++ b/arch/m68k/kernel/traps.c @@ -706,6 +706,88 @@ create_atc_entry: #endif /* CPU_M68020_OR_M68030 */ #endif /* !CONFIG_SUN3 */ +#if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU) +#include <asm/mcfmmu.h> + +/* + * The following table converts the FS encoding of a ColdFire + * exception stack frame into the error_code value needed by + * do_fault. +*/ +static const unsigned char fs_err_code[] = { + 0, /* 0000 */ + 0, /* 0001 */ + 0, /* 0010 */ + 0, /* 0011 */ + 1, /* 0100 */ + 0, /* 0101 */ + 0, /* 0110 */ + 0, /* 0111 */ + 2, /* 1000 */ + 3, /* 1001 */ + 2, /* 1010 */ + 0, /* 1011 */ + 1, /* 1100 */ + 1, /* 1101 */ + 0, /* 1110 */ + 0 /* 1111 */ +}; + +static inline void access_errorcf(unsigned int fs, struct frame *fp) +{ + unsigned long mmusr, addr; + unsigned int err_code; + int need_page_fault; + + mmusr = mmu_read(MMUSR); + addr = mmu_read(MMUAR); + + /* + * error_code: + * bit 0 == 0 means no page found, 1 means protection fault + * bit 1 == 0 means read, 1 means write + */ + switch (fs) { + case 5: /* 0101 TLB opword X miss */ + need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 0); + addr = fp->ptregs.pc; + break; + case 6: /* 0110 TLB extension word X miss */ + need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 0, 1); + addr = fp->ptregs.pc + sizeof(long); + break; + case 10: /* 1010 TLB W miss */ + need_page_fault = cf_tlb_miss(&fp->ptregs, 1, 1, 0); + break; + case 14: /* 1110 TLB R miss */ + need_page_fault = cf_tlb_miss(&fp->ptregs, 0, 1, 0); + break; + default: + /* 0000 Normal */ + /* 0001 Reserved */ + /* 0010 Interrupt during debug service routine */ + /* 0011 Reserved */ + /* 0100 X Protection */ + /* 0111 IFP in emulator mode */ + /* 1000 W Protection*/ + /* 1001 Write error*/ + /* 1011 Reserved*/ + /* 1100 R Protection*/ + /* 1101 R Protection*/ + /* 1111 OEP in emulator mode*/ + need_page_fault = 1; + break; + } + + if (need_page_fault) { + err_code = fs_err_code[fs]; + if ((fs == 13) && (mmusr & MMUSR_WF)) /* rd-mod-wr access */ + err_code |= 2; /* bit1 - write, bit0 - protection */ + do_page_fault(&fp->ptregs, addr, err_code); + } +} +#endif /* CONFIG_COLDFIRE CONFIG_MMU */ + asmlinkage void buserr_c(struct frame *fp) { /* Only set esp0 if coming from user mode */ @@ -716,6 +798,28 @@ asmlinkage void buserr_c(struct frame *fp) printk ("*** Bus Error *** Format is %x\n", fp->ptregs.format); #endif +#if defined(CONFIG_COLDFIRE) && defined(CONFIG_MMU) + if (CPU_IS_COLDFIRE) { + unsigned int fs; + fs = (fp->ptregs.vector & 0x3) | + ((fp->ptregs.vector & 0xc00) >> 8); + switch (fs) { + case 0x5: + case 0x6: + case 0x7: + case 0x9: + case 0xa: + case 0xd: + case 0xe: + case 0xf: + access_errorcf(fs, fp); + return; + default: + break; + } + } +#endif /* CONFIG_COLDFIRE && CONFIG_MMU */ + switch (fp->ptregs.format) { #if defined (CONFIG_M68060) case 4: /* 68060 access error */ |