[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>
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 0ae19e1..2a932ca 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -669,8 +669,6 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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);
}
diff --git a/include/asm-mips/bug.h b/include/asm-mips/bug.h
index 7b4739d..4d560a5 100644
--- a/include/asm-mips/bug.h
+++ b/include/asm-mips/bug.h
@@ -1,6 +1,7 @@
#ifndef __ASM_BUG_H
#define __ASM_BUG_H
+#include <asm/sgidefs.h>
#ifdef CONFIG_BUG
@@ -13,6 +14,17 @@
#define HAVE_ARCH_BUG
+#if (_MIPS_ISA > _MIPS_ISA_MIPS1)
+
+#define BUG_ON(condition) \
+do { \
+ __asm__ __volatile__("tne $0, %0" : : "r" (condition)); \
+} while (0)
+
+#define HAVE_ARCH_BUG_ON
+
+#endif /* _MIPS_ISA > _MIPS_ISA_MIPS1 */
+
#endif
#include <asm-generic/bug.h>
diff --git a/include/asm-mips/ptrace.h b/include/asm-mips/ptrace.h
index 5f3a907..30bf555 100644
--- a/include/asm-mips/ptrace.h
+++ b/include/asm-mips/ptrace.h
@@ -80,8 +80,6 @@
#define instruction_pointer(regs) ((regs)->cp0_epc)
#define profile_pc(regs) instruction_pointer(regs)
-extern void show_regs(struct pt_regs *);
-
extern asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit);
#endif
