diff options
| -rw-r--r-- | arch/mips/math-emu/cp1emu.c | 4 | ||||
| -rw-r--r-- | arch/mips/math-emu/dsemul.c | 14 |
2 files changed, 12 insertions, 6 deletions
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c index 32f0e19a0d7f..cdfd44ffa51c 100644 --- a/arch/mips/math-emu/cp1emu.c +++ b/arch/mips/math-emu/cp1emu.c @@ -1266,6 +1266,8 @@ branch_common: */ sig = mips_dsemul(xcp, ir, contpc); + if (sig < 0) + break; if (sig) xcp->cp0_epc = bcpc; /* @@ -1319,6 +1321,8 @@ branch_common: * instruction in the dslot */ sig = mips_dsemul(xcp, ir, contpc); + if (sig < 0) + break; if (sig) xcp->cp0_epc = bcpc; /* SIGILL forces out of the emulation loop. */ 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); |