diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 2006-10-16 01:38:50 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2006-11-30 01:14:50 +0000 |
| commit | 63dc68a8cf60cb110b147dab1704d990808b39e2 (patch) | |
| tree | 48dbc7a170eff5e16c3a1f6bf4fe53ab168c4e83 | |
| parent | 005985609ff72df3257fde6b29aa9d71342c2a6b (diff) | |
| download | linux-63dc68a8cf60cb110b147dab1704d990808b39e2.tar.bz2 | |
[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>
| -rw-r--r-- | arch/mips/kernel/traps.c | 14 | ||||
| -rw-r--r-- | include/asm-mips/bug.h | 12 | ||||
| -rw-r--r-- | include/asm-mips/ptrace.h | 2 |
3 files changed, 22 insertions, 6 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index 0ae19e1fa867..2a932cada244 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); } diff --git a/include/asm-mips/bug.h b/include/asm-mips/bug.h index 7b4739dc8f3f..4d560a533940 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 @@ do { \ #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 5f3a9075cd28..30bf555faeaa 100644 --- a/include/asm-mips/ptrace.h +++ b/include/asm-mips/ptrace.h @@ -80,8 +80,6 @@ struct pt_regs { #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 |