diff options
| -rw-r--r-- | target/nios2/translate.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/target/nios2/translate.c b/target/nios2/translate.c index 52965ba..a5f8d20 100644 --- a/target/nios2/translate.c +++ b/target/nios2/translate.c @@ -452,6 +452,17 @@ static void rdctl(DisasContext *dc, uint32_t code, uint32_t flags) } switch (instr.imm5 + CR_BASE) { + case CR_IPENDING: + /* + * The value of the ipending register is synthetic. + * In hw, this is the AND of a set of hardware irq lines + * with the ienable register. In qemu, we re-use the space + * of CR_IPENDING to store the set of irq lines, and so we + * must perform the AND here, and anywhere else we need the + * guest value of ipending. + */ + tcg_gen_and_tl(cpu_R[instr.c], cpu_R[CR_IPENDING], cpu_R[CR_IENABLE]); + break; default: tcg_gen_mov_tl(cpu_R[instr.c], cpu_R[instr.imm5 + CR_BASE]); break; @@ -477,6 +488,9 @@ static void wrctl(DisasContext *dc, uint32_t code, uint32_t flags) case CR_TLBMISC: gen_helper_mmu_write_tlbmisc(cpu_env, v); break; + case CR_IPENDING: + /* ipending is read only, writes ignored. */ + break; default: tcg_gen_mov_tl(cpu_R[instr.imm5 + CR_BASE], v); break; |