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authorRalf Baechle <ralf@linux-mips.org>2006-10-16 01:38:50 +0100
committerRalf Baechle <ralf@linux-mips.org>2006-11-30 01:14:50 +0000
commit63dc68a8cf60cb110b147dab1704d990808b39e2 (patch)
tree48dbc7a170eff5e16c3a1f6bf4fe53ab168c4e83 /arch
parent005985609ff72df3257fde6b29aa9d71342c2a6b (diff)
[MIPS] Use conditional traps for BUG_ON on MIPS II and better.
This shaves of around 4kB and a few cycles for the average kernel that has CONFIG_BUG enabled. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/kernel/traps.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 0ae19e1fa86..2a932cada24 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -669,8 +669,6 @@ asmlinkage void do_bp(struct pt_regs *regs)
unsigned int opcode, bcode;
siginfo_t info;
- die_if_kernel("Break instruction in kernel code", regs);
-
if (get_user(opcode, (unsigned int __user *) exception_epc(regs)))
goto out_sigsegv;
@@ -693,6 +691,7 @@ asmlinkage void do_bp(struct pt_regs *regs)
switch (bcode) {
case BRK_OVERFLOW << 10:
case BRK_DIVZERO << 10:
+ die_if_kernel("Break instruction in kernel code", regs);
if (bcode == (BRK_DIVZERO << 10))
info.si_code = FPE_INTDIV;
else
@@ -702,7 +701,11 @@ asmlinkage void do_bp(struct pt_regs *regs)
info.si_addr = (void __user *) regs->cp0_epc;
force_sig_info(SIGFPE, &info, current);
break;
+ case BRK_BUG:
+ die("Kernel bug detected", regs);
+ break;
default:
+ die_if_kernel("Break instruction in kernel code", regs);
force_sig(SIGTRAP, current);
}
@@ -715,8 +718,6 @@ asmlinkage void do_tr(struct pt_regs *regs)
unsigned int opcode, tcode = 0;
siginfo_t info;
- die_if_kernel("Trap instruction in kernel code", regs);
-
if (get_user(opcode, (unsigned int __user *) exception_epc(regs)))
goto out_sigsegv;
@@ -733,6 +734,7 @@ asmlinkage void do_tr(struct pt_regs *regs)
switch (tcode) {
case BRK_OVERFLOW:
case BRK_DIVZERO:
+ die_if_kernel("Trap instruction in kernel code", regs);
if (tcode == BRK_DIVZERO)
info.si_code = FPE_INTDIV;
else
@@ -742,7 +744,11 @@ asmlinkage void do_tr(struct pt_regs *regs)
info.si_addr = (void __user *) regs->cp0_epc;
force_sig_info(SIGFPE, &info, current);
break;
+ case BRK_BUG:
+ die("Kernel bug detected", regs);
+ break;
default:
+ die_if_kernel("Trap instruction in kernel code", regs);
force_sig(SIGTRAP, current);
}