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| 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 /arch/mips | |
| parent | 005985609ff72df3257fde6b29aa9d71342c2a6b (diff) | |
| download | blackbird-op-linux-63dc68a8cf60cb110b147dab1704d990808b39e2.tar.gz blackbird-op-linux-63dc68a8cf60cb110b147dab1704d990808b39e2.zip | |
[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/mips')
| -rw-r--r-- | arch/mips/kernel/traps.c | 14 |
1 files changed, 10 insertions, 4 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); } |
