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[MIPS] Fix BUG(), BUG_ON() handling 

With commit 63dc68a8cf, kernel can not
handle BUG() and BUG_ON() properly since get_user() returns false for
kernel code.  Use __get_user() to skip unnecessary access_ok().  This
patch also make BRK_BUG code encoded in the TNE instruction.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto 2007-04-12 20:02:54 +09:00 committed by Ralf Baechle
parent faea623464
commit ba755f8ec8
2 changed files with 4 additions and 3 deletions
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4
arch/mips/kernel/traps.c
View File

@ -650,7 +650,7 @@ asmlinkage void do_bp(struct pt_regs *regs)
unsigned int opcode, bcode;
siginfo_t info;
if (get_user(opcode, (unsigned int __user *) exception_epc(regs)))
if (__get_user(opcode, (unsigned int __user *) exception_epc(regs)))
goto out_sigsegv;
/*
@ -700,7 +700,7 @@ asmlinkage void do_tr(struct pt_regs *regs)
unsigned int opcode, tcode = 0;
siginfo_t info;
if (get_user(opcode, (unsigned int __user *) exception_epc(regs)))
if (__get_user(opcode, (unsigned int __user *) exception_epc(regs)))
goto out_sigsegv;
/* Immediate versions don't provide a code. */

3
include/asm-mips/bug.h
View File

@ -18,7 +18,8 @@ do { \
#define BUG_ON(condition) \
do { \
__asm__ __volatile__("tne $0, %0" : : "r" (condition)); \
__asm__ __volatile__("tne $0, %0, %1" \
: : "r" (condition), "i" (BRK_BUG)); \
} while (0)
#define HAVE_ARCH_BUG_ON