[PATCH] m32r: trap handler code for illegal traps
This patch prevents illegal traps from causing m32r kernel's infinite loop execution. Signed-off-by: Naoto Sugai <sugai@isl.melco.co.jp> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -681,6 +681,15 @@ ENTRY(debug_trap)
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bl do_debug_trap
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bra error_code
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ENTRY(ill_trap)
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/* void ill_trap(void) */
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SWITCH_TO_KERNEL_STACK
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SAVE_ALL
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ldi r1, #0 ; error_code ; FIXME
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mv r0, sp ; pt_regs
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bl do_ill_trap
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bra error_code
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/* Cache flushing handler */
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ENTRY(cache_flushing_handler)
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@ -5,8 +5,6 @@
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* Hitoshi Yamamoto
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*/
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/* $Id$ */
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/*
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* 'traps.c' handles hardware traps and faults after we have saved some
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* state in 'entry.S'.
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@ -35,6 +33,7 @@ asmlinkage void ei_handler(void);
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asmlinkage void rie_handler(void);
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asmlinkage void debug_trap(void);
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asmlinkage void cache_flushing_handler(void);
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asmlinkage void ill_trap(void);
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#ifdef CONFIG_SMP
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extern void smp_reschedule_interrupt(void);
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@ -77,22 +76,22 @@ void set_eit_vector_entries(void)
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eit_vector[5] = BRA_INSN(default_eit_handler, 5);
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eit_vector[8] = BRA_INSN(rie_handler, 8);
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eit_vector[12] = BRA_INSN(alignment_check, 12);
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eit_vector[16] = 0xff000000UL;
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eit_vector[16] = BRA_INSN(ill_trap, 16);
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eit_vector[17] = BRA_INSN(debug_trap, 17);
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eit_vector[18] = BRA_INSN(system_call, 18);
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eit_vector[19] = 0xff000000UL;
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eit_vector[20] = 0xff000000UL;
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eit_vector[21] = 0xff000000UL;
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eit_vector[22] = 0xff000000UL;
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eit_vector[23] = 0xff000000UL;
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eit_vector[24] = 0xff000000UL;
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eit_vector[25] = 0xff000000UL;
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eit_vector[26] = 0xff000000UL;
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eit_vector[27] = 0xff000000UL;
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eit_vector[19] = BRA_INSN(ill_trap, 19);
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eit_vector[20] = BRA_INSN(ill_trap, 20);
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eit_vector[21] = BRA_INSN(ill_trap, 21);
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eit_vector[22] = BRA_INSN(ill_trap, 22);
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eit_vector[23] = BRA_INSN(ill_trap, 23);
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eit_vector[24] = BRA_INSN(ill_trap, 24);
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eit_vector[25] = BRA_INSN(ill_trap, 25);
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eit_vector[26] = BRA_INSN(ill_trap, 26);
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eit_vector[27] = BRA_INSN(ill_trap, 27);
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eit_vector[28] = BRA_INSN(cache_flushing_handler, 28);
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eit_vector[29] = 0xff000000UL;
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eit_vector[30] = 0xff000000UL;
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eit_vector[31] = 0xff000000UL;
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eit_vector[29] = BRA_INSN(ill_trap, 29);
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eit_vector[30] = BRA_INSN(ill_trap, 30);
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eit_vector[31] = BRA_INSN(ill_trap, 31);
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eit_vector[32] = BRA_INSN(ei_handler, 32);
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eit_vector[64] = BRA_INSN(pie_handler, 64);
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#ifdef CONFIG_MMU
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@ -286,7 +285,8 @@ asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
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DO_ERROR( 1, SIGTRAP, "debug trap", debug_trap)
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DO_ERROR_INFO(0x20, SIGILL, "reserved instruction ", rie_handler, ILL_ILLOPC, regs->bpc)
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DO_ERROR_INFO(0x100, SIGILL, "privilege instruction", pie_handler, ILL_PRVOPC, regs->bpc)
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DO_ERROR_INFO(0x100, SIGILL, "privileged instruction", pie_handler, ILL_PRVOPC, regs->bpc)
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DO_ERROR_INFO(-1, SIGILL, "illegal trap", ill_trap, ILL_ILLTRP, regs->bpc)
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extern int handle_unaligned_access(unsigned long, struct pt_regs *);
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@ -329,4 +329,3 @@ asmlinkage void do_alignment_check(struct pt_regs *regs, long error_code)
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set_fs(oldfs);
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}
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}
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