diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2019-03-22 22:03:39 -0700 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2019-06-10 07:03:42 -0700 |
| commit | 269bd5d8f61c6b0825ed3c6a5fe01a3ad71c3b4a (patch) | |
| tree | b51b8c1ca4eadac1eee562a5e1671b778e022250 /tcg/mips | |
| parent | 5e1401969b25f676fee6b1c564441759cf967a43 (diff) | |
| download | qemu-269bd5d8f61c6b0825ed3c6a5fe01a3ad71c3b4a.zip qemu-269bd5d8f61c6b0825ed3c6a5fe01a3ad71c3b4a.tar.gz qemu-269bd5d8f61c6b0825ed3c6a5fe01a3ad71c3b4a.tar.bz2 | |
cpu: Move the softmmu tlb to CPUNegativeOffsetState
We have for some time had code within the tcg backends to
handle large positive offsets from env. This move makes
sure that need not happen. Indeed, we are able to assert
at build time that simple offsets suffice for all hosts.
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'tcg/mips')
| -rw-r--r-- | tcg/mips/tcg-target.inc.c | 39 |
1 files changed, 9 insertions, 30 deletions
diff --git a/tcg/mips/tcg-target.inc.c b/tcg/mips/tcg-target.inc.c index ef66335..41bff32 100644 --- a/tcg/mips/tcg-target.inc.c +++ b/tcg/mips/tcg-target.inc.c @@ -1202,6 +1202,10 @@ static int tcg_out_call_iarg_reg2(TCGContext *s, int i, TCGReg al, TCGReg ah) return i; } +/* We expect to use a 16-bit negative offset from ENV. */ +QEMU_BUILD_BUG_ON(TLB_MASK_TABLE_OFS(0) > 0); +QEMU_BUILD_BUG_ON(TLB_MASK_TABLE_OFS(0) < -32768); + /* * Perform the tlb comparison operation. * The complete host address is placed in BASE. @@ -1215,42 +1219,17 @@ static void tcg_out_tlb_load(TCGContext *s, TCGReg base, TCGReg addrl, unsigned s_bits = opc & MO_SIZE; unsigned a_bits = get_alignment_bits(opc); int mem_index = get_mmuidx(oi); - int mask_off = offsetof(CPUArchState, tlb_.f[mem_index].mask); - int table_off = offsetof(CPUArchState, tlb_.f[mem_index].mask); + int fast_off = TLB_MASK_TABLE_OFS(mem_index); + int mask_off = fast_off + offsetof(CPUTLBDescFast, mask); + int table_off = fast_off + offsetof(CPUTLBDescFast, table); int add_off = offsetof(CPUTLBEntry, addend); int cmp_off = (is_load ? offsetof(CPUTLBEntry, addr_read) : offsetof(CPUTLBEntry, addr_write)); - TCGReg mask_base = TCG_AREG0, table_base = TCG_AREG0; target_ulong mask; - if (table_off > 0x7fff) { - int mask_hi = mask_off - (int16_t)mask_off; - int table_hi = table_off - (int16_t)table_off; - - table_base = TCG_TMP1; - if (likely(mask_hi == table_hi)) { - mask_base = table_base; - tcg_out_opc_imm(s, OPC_LUI, mask_base, TCG_REG_ZERO, mask_hi >> 16); - tcg_out_opc_reg(s, ALIAS_PADD, mask_base, mask_base, TCG_AREG0); - mask_off -= mask_hi; - table_off -= mask_hi; - } else { - if (mask_hi != 0) { - mask_base = TCG_TMP0; - tcg_out_opc_imm(s, OPC_LUI, - mask_base, TCG_REG_ZERO, mask_hi >> 16); - tcg_out_opc_reg(s, ALIAS_PADD, - mask_base, mask_base, TCG_AREG0); - } - table_off -= mask_off; - mask_off -= mask_hi; - tcg_out_opc_imm(s, ALIAS_PADDI, table_base, mask_base, mask_off); - } - } - /* Load tlb_mask[mmu_idx] and tlb_table[mmu_idx]. */ - tcg_out_ld(s, TCG_TYPE_PTR, TCG_TMP0, mask_base, mask_off); - tcg_out_ld(s, TCG_TYPE_PTR, TCG_TMP1, table_base, table_off); + tcg_out_ld(s, TCG_TYPE_PTR, TCG_TMP0, TCG_AREG0, mask_off); + tcg_out_ld(s, TCG_TYPE_PTR, TCG_TMP1, TCG_AREG0, table_off); /* Extract the TLB index from the address into TMP3. */ tcg_out_opc_sa(s, ALIAS_TSRL, TCG_TMP3, addrl, |