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Diffstat (limited to 'arch/mips/math-emu/dsemul.c')
-rw-r--r--arch/mips/math-emu/dsemul.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/arch/mips/math-emu/dsemul.c b/arch/mips/math-emu/dsemul.c
index cbb36c14b155..70e4824c64dc 100644
--- a/arch/mips/math-emu/dsemul.c
+++ b/arch/mips/math-emu/dsemul.c
@@ -31,18 +31,20 @@ struct emuframe {
unsigned long epc;
};
+/*
+ * Set up an emulation frame for instruction IR, from a delay slot of
+ * a branch jumping to CPC. Return 0 if successful, -1 if no emulation
+ * required, otherwise a signal number causing a frame setup failure.
+ */
int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc)
{
struct emuframe __user *fr;
int err;
+ /* NOP is easy */
if ((get_isa16_mode(regs->cp0_epc) && ((ir >> 16) == MM_NOP16)) ||
- (ir == 0)) {
- /* NOP is easy */
- regs->cp0_epc = cpc;
- clear_delay_slot(regs);
- return 0;
- }
+ (ir == 0))
+ return -1;
pr_debug("dsemul %lx %lx\n", regs->cp0_epc, cpc);