diff options
| -rw-r--r-- | arch/x86_64/kernel/traps.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c index 64a59cb4941..77658f7f4e8 100644 --- a/arch/x86_64/kernel/traps.c +++ b/arch/x86_64/kernel/traps.c @@ -795,13 +795,16 @@ asmlinkage void do_coprocessor_error(struct pt_regs *regs) */ cwd = get_fpu_cwd(task); swd = get_fpu_swd(task); - switch (((~cwd) & swd & 0x3f) | (swd & 0x240)) { + switch (swd & ~cwd & 0x3f) { case 0x000: default: break; case 0x001: /* Invalid Op */ - case 0x041: /* Stack Fault */ - case 0x241: /* Stack Fault | Direction */ + /* + * swd & 0x240 == 0x040: Stack Underflow + * swd & 0x240 == 0x240: Stack Overflow + * User must clear the SF bit (0x40) if set + */ info.si_code = FPE_FLTINV; break; case 0x002: /* Denormalize */ |