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| author | Maciej W. Rozycki <macro@linux-mips.org> | 2015-04-03 23:26:56 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-04-08 01:10:09 +0200 |
| commit | 9ab4471c9f1b3e986f4d429951492f736c888ff6 (patch) | |
| tree | 331efb7e2a03576a9e3da4f596f8237e1d98efe1 /arch/mips/math-emu/dsemul.c | |
| parent | 2d83fea786d7aeb5b3b76bd492d9b3bccc0f823c (diff) | |
| download | linux-9ab4471c9f1b3e986f4d429951492f736c888ff6.tar.gz | |
MIPS: math-emu: Correct delay-slot exception propagation
Restore EPC at the branch whose delay slot is emulated if the delay-slot instruction signals. This is so that code in `fpu_emulator_cop1Handler' does not see EPC having advanced and mistakenly successfully resume userland execution from the location at the branch target in that case. Restoring EPC guarantees an immediate exit from the emulation loop and if EPC hasn't advanced at all since entering the loop, also issuing the signal reported by the delay-slot instruction. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9701/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/math-emu/dsemul.c')
| -rw-r--r-- | arch/mips/math-emu/dsemul.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/mips/math-emu/dsemul.c b/arch/mips/math-emu/dsemul.c index 00ad7365e453..e0b5cc27d78b 100644 --- a/arch/mips/math-emu/dsemul.c +++ b/arch/mips/math-emu/dsemul.c @@ -96,7 +96,7 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir, unsigned long cpc) flush_cache_sigtramp((unsigned long)&fr->emul); - return SIGILL; /* force out of emulation loop */ + return 0; } int do_dsemulret(struct pt_regs *xcp) |