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microblaze_v8: exception handling

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Reviewed-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Acked-by: John Linn <john.linn@xilinx.com>
Acked-by: John Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek
2009-03-27 14:25:13 +01:00
parent 945ce1bc54
commit c4df4bc155
3 changed files with 678 additions and 0 deletions
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96
arch/microblaze/include/asm/exceptions.h Normal file
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/*
* Preliminary support for HW exception handing for Microblaze
*
* Copyright (C) 2008 Michal Simek
* Copyright (C) 2008 PetaLogix
* Copyright (C) 2005 John Williams <jwilliams@itee.uq.edu.au>
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file COPYING in the main directory of this
* archive for more details.
*/
#ifndef _ASM_MICROBLAZE_EXCEPTIONS_H
#define _ASM_MICROBLAZE_EXCEPTIONS_H
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
/* Macros to enable and disable HW exceptions in the MSR */
/* Define MSR enable bit for HW exceptions */
#define HWEX_MSR_BIT (1 << 8)
#if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
#define __enable_hw_exceptions() \
__asm__ __volatile__ (" msrset r0, %0; \
nop;" \
: \
: "i" (HWEX_MSR_BIT) \
: "memory")
#define __disable_hw_exceptions() \
__asm__ __volatile__ (" msrclr r0, %0; \
nop;" \
: \
: "i" (HWEX_MSR_BIT) \
: "memory")
#else /* !CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
#define __enable_hw_exceptions() \
__asm__ __volatile__ (" \
mfs r12, rmsr; \
nop; \
ori r12, r12, %0; \
mts rmsr, r12; \
nop;" \
: \
: "i" (HWEX_MSR_BIT) \
: "memory", "r12")
#define __disable_hw_exceptions() \
__asm__ __volatile__ (" \
mfs r12, rmsr; \
nop; \
andi r12, r12, ~%0; \
mts rmsr, r12; \
nop;" \
: \
: "i" (HWEX_MSR_BIT) \
: "memory", "r12")
#endif /* CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR */
asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
int fsr, int addr);
#if defined(CONFIG_XMON)
extern void xmon(struct pt_regs *regs);
extern int xmon_bpt(struct pt_regs *regs);
extern int xmon_sstep(struct pt_regs *regs);
extern int xmon_iabr_match(struct pt_regs *regs);
extern int xmon_dabr_match(struct pt_regs *regs);
extern void (*xmon_fault_handler)(struct pt_regs *regs);
void (*debugger)(struct pt_regs *regs) = xmon;
int (*debugger_bpt)(struct pt_regs *regs) = xmon_bpt;
int (*debugger_sstep)(struct pt_regs *regs) = xmon_sstep;
int (*debugger_iabr_match)(struct pt_regs *regs) = xmon_iabr_match;
int (*debugger_dabr_match)(struct pt_regs *regs) = xmon_dabr_match;
void (*debugger_fault_handler)(struct pt_regs *regs);
#elif defined(CONFIG_KGDB)
void (*debugger)(struct pt_regs *regs);
int (*debugger_bpt)(struct pt_regs *regs);
int (*debugger_sstep)(struct pt_regs *regs);
int (*debugger_iabr_match)(struct pt_regs *regs);
int (*debugger_dabr_match)(struct pt_regs *regs);
void (*debugger_fault_handler)(struct pt_regs *regs);
#else
#define debugger(regs) do { } while (0)
#define debugger_bpt(regs) 0
#define debugger_sstep(regs) 0
#define debugger_iabr_match(regs) 0
#define debugger_dabr_match(regs) 0
#define debugger_fault_handler ((void (*)(struct pt_regs *))0)
#endif
#endif /*__ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* _ASM_MICROBLAZE_EXCEPTIONS_H */