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| author | Michal Simek <monstr@monstr.eu> | 2009-05-26 16:30:24 +0200 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2009-05-26 16:45:20 +0200 |
| commit | 4bb73c3de752dc386958be32dc7e1d9fefdcbbf0 (patch) | |
| tree | 8931ff6a85eb734c1769601f7cd62c632667e404 /arch/microblaze | |
| parent | 0d6de9532663a4120ce35f507f16b72df382e360 (diff) | |
| download | linux-4bb73c3de752dc386958be32dc7e1d9fefdcbbf0.tar.bz2 | |
microblaze_mmu_v2: Add MMU related exceptions handling
Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze')
| -rw-r--r-- | arch/microblaze/kernel/exceptions.c | 45 |
1 files changed, 37 insertions, 8 deletions
diff --git a/arch/microblaze/kernel/exceptions.c b/arch/microblaze/kernel/exceptions.c index 4a8a4064c7ee..0cb64a31e89a 100644 --- a/arch/microblaze/kernel/exceptions.c +++ b/arch/microblaze/kernel/exceptions.c @@ -21,9 +21,9 @@ #include <asm/exceptions.h> #include <asm/entry.h> /* For KM CPU var */ -#include <asm/uaccess.h> -#include <asm/errno.h> -#include <asm/ptrace.h> +#include <linux/uaccess.h> +#include <linux/errno.h> +#include <linux/ptrace.h> #include <asm/current.h> #define MICROBLAZE_ILL_OPCODE_EXCEPTION 0x02 @@ -31,7 +31,7 @@ #define MICROBLAZE_DBUS_EXCEPTION 0x04 #define MICROBLAZE_DIV_ZERO_EXCEPTION 0x05 #define MICROBLAZE_FPU_EXCEPTION 0x06 -#define MICROBLAZE_PRIVILEG_EXCEPTION 0x07 +#define MICROBLAZE_PRIVILEGED_EXCEPTION 0x07 static DEFINE_SPINLOCK(die_lock); @@ -66,6 +66,11 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr) asmlinkage void full_exception(struct pt_regs *regs, unsigned int type, int fsr, int addr) { +#ifdef CONFIG_MMU + int code; + addr = regs->pc; +#endif + #if 0 printk(KERN_WARNING "Exception %02x in %s mode, FSR=%08x PC=%08x ESR=%08x\n", type, user_mode(regs) ? "user" : "kernel", fsr, @@ -74,7 +79,13 @@ asmlinkage void full_exception(struct pt_regs *regs, unsigned int type, switch (type & 0x1F) { case MICROBLAZE_ILL_OPCODE_EXCEPTION: - _exception(SIGILL, regs, ILL_ILLOPC, addr); + if (user_mode(regs)) { + printk(KERN_WARNING "Illegal opcode exception in user mode.\n"); + _exception(SIGILL, regs, ILL_ILLOPC, addr); + return; + } + printk(KERN_WARNING "Illegal opcode exception in kernel mode.\n"); + die("opcode exception", regs, SIGBUS); break; case MICROBLAZE_IBUS_EXCEPTION: if (user_mode(regs)) { @@ -95,11 +106,16 @@ asmlinkage void full_exception(struct pt_regs *regs, unsigned int type, die("bus exception", regs, SIGBUS); break; case MICROBLAZE_DIV_ZERO_EXCEPTION: - printk(KERN_WARNING "Divide by zero exception\n"); - _exception(SIGILL, regs, ILL_ILLOPC, addr); + if (user_mode(regs)) { + printk(KERN_WARNING "Divide by zero exception in user mode\n"); + _exception(SIGILL, regs, ILL_ILLOPC, addr); + return; + } + printk(KERN_WARNING "Divide by zero exception in kernel mode.\n"); + die("Divide by exception", regs, SIGBUS); break; - case MICROBLAZE_FPU_EXCEPTION: + printk(KERN_WARNING "FPU exception\n"); /* IEEE FP exception */ /* I removed fsr variable and use code var for storing fsr */ if (fsr & FSR_IO) @@ -115,7 +131,20 @@ asmlinkage void full_exception(struct pt_regs *regs, unsigned int type, _exception(SIGFPE, regs, fsr, addr); break; +#ifdef CONFIG_MMU + case MICROBLAZE_PRIVILEGED_EXCEPTION: + printk(KERN_WARNING "Privileged exception\n"); + /* "brk r0,r0" - used as debug breakpoint */ + if (get_user(code, (unsigned long *)regs->pc) == 0 + && code == 0x980c0000) { + _exception(SIGTRAP, regs, TRAP_BRKPT, addr); + } else { + _exception(SIGILL, regs, ILL_PRVOPC, addr); + } + break; +#endif default: + /* FIXME what to do in unexpected exception */ printk(KERN_WARNING "Unexpected exception %02x " "PC=%08x in %s mode\n", type, (unsigned int) addr, kernel_mode(regs) ? "kernel" : "user"); |