diff options
Diffstat (limited to 'arch/mips/kernel/unaligned.c')
| -rw-r--r-- | arch/mips/kernel/unaligned.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/arch/mips/kernel/unaligned.c b/arch/mips/kernel/unaligned.c index 6087a54c86a0..f4c94ff3e3d3 100644 --- a/arch/mips/kernel/unaligned.c +++ b/arch/mips/kernel/unaligned.c @@ -83,6 +83,8 @@ #include <asm/branch.h> #include <asm/byteorder.h> #include <asm/cop2.h> +#include <asm/fpu.h> +#include <asm/fpu_emulator.h> #include <asm/inst.h> #include <asm/uaccess.h> @@ -108,6 +110,7 @@ static void emulate_load_store_insn(struct pt_regs *regs, union mips_instruction insn; unsigned long value; unsigned int res; + void __user *fault_addr = NULL; perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0); @@ -447,10 +450,21 @@ static void emulate_load_store_insn(struct pt_regs *regs, case ldc1_op: case swc1_op: case sdc1_op: - /* - * I herewith declare: this does not happen. So send SIGBUS. - */ - goto sigbus; + die_if_kernel("Unaligned FP access in kernel code", regs); + BUG_ON(!used_math()); + BUG_ON(!is_fpu_owner()); + + lose_fpu(1); /* Save FPU state for the emulator. */ + res = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 1, + &fault_addr); + own_fpu(1); /* Restore FPU state. */ + + /* Signal if something went wrong. */ + process_fpemu_return(res, fault_addr); + + if (res == 0) + break; + return; /* * COP2 is available to implementor for application specific use. |