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target-tilegx: Handle nofault prefetch instructions

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These are mapped onto some of the normal load instructions, when the
destination is the zero register.  Other load insns do fault even
when targeting the zero register.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2015-10-01 12:32:52 +10:00
parent 95df61e623
commit 133b84c819
1 changed files with 26 additions and 14 deletions
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40
target-tilegx/translate.c
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@ -496,6 +496,7 @@ static TileExcp gen_rr_opcode(DisasContext *dc, unsigned opext,
const char *mnemonic;
TCGMemOp memop;
TileExcp ret = TILEGX_EXCP_NONE;
bool prefetch_nofault = false;
/* Eliminate instructions with no output before doing anything else. */
switch (opext) {
@ -609,27 +610,30 @@ static TileExcp gen_rr_opcode(DisasContext *dc, unsigned opext,
return TILEGX_EXCP_OPCODE_UNIMPLEMENTED;
case OE_RR_X1(LD1S):
memop = MO_SB;
mnemonic = "ld1s";
mnemonic = "ld1s"; /* prefetch_l1_fault */
goto do_load;
case OE_RR_X1(LD1U):
memop = MO_UB;
mnemonic = "ld1u";
mnemonic = "ld1u"; /* prefetch, prefetch_l1 */
prefetch_nofault = (dest == TILEGX_R_ZERO);
goto do_load;
case OE_RR_X1(LD2S):
memop = MO_TESW;
mnemonic = "ld2s";
mnemonic = "ld2s"; /* prefetch_l2_fault */
goto do_load;
case OE_RR_X1(LD2U):
memop = MO_TEUW;
mnemonic = "ld2u";
mnemonic = "ld2u"; /* prefetch_l2 */
prefetch_nofault = (dest == TILEGX_R_ZERO);
goto do_load;
case OE_RR_X1(LD4S):
memop = MO_TESL;
mnemonic = "ld4s";
mnemonic = "ld4s"; /* prefetch_l3_fault */
goto do_load;
case OE_RR_X1(LD4U):
memop = MO_TEUL;
mnemonic = "ld4u";
mnemonic = "ld4u"; /* prefetch_l3 */
prefetch_nofault = (dest == TILEGX_R_ZERO);
goto do_load;
case OE_RR_X1(LDNT1S):
memop = MO_SB;
@ -663,7 +667,9 @@ static TileExcp gen_rr_opcode(DisasContext *dc, unsigned opext,
memop = MO_TEQ;
mnemonic = "ld";
do_load:
tcg_gen_qemu_ld_tl(tdest, tsrca, dc->mmuidx, memop);
if (!prefetch_nofault) {
tcg_gen_qemu_ld_tl(tdest, tsrca, dc->mmuidx, memop);
}
break;
case OE_RR_X1(LDNA):
tcg_gen_andi_tl(tdest, tsrca, ~7);
@ -1442,6 +1448,7 @@ static TileExcp gen_rri_opcode(DisasContext *dc, unsigned opext,
{
TCGv tdest = dest_gr(dc, dest);
TCGv tsrca = load_gr(dc, srca);
bool prefetch_nofault = false;
const char *mnemonic;
TCGMemOp memop;
int i2, i3;
@ -1491,27 +1498,30 @@ static TileExcp gen_rri_opcode(DisasContext *dc, unsigned opext,
break;
case OE_IM(LD1S_ADD, X1):
memop = MO_SB;
mnemonic = "ld1s_add";
mnemonic = "ld1s_add"; /* prefetch_add_l1_fault */
goto do_load_add;
case OE_IM(LD1U_ADD, X1):
memop = MO_UB;
mnemonic = "ld1u_add";
mnemonic = "ld1u_add"; /* prefetch_add_l1 */
prefetch_nofault = (dest == TILEGX_R_ZERO);
goto do_load_add;
case OE_IM(LD2S_ADD, X1):
memop = MO_TESW;
mnemonic = "ld2s_add";
mnemonic = "ld2s_add"; /* prefetch_add_l2_fault */
goto do_load_add;
case OE_IM(LD2U_ADD, X1):
memop = MO_TEUW;
mnemonic = "ld2u_add";
mnemonic = "ld2u_add"; /* prefetch_add_l2 */
prefetch_nofault = (dest == TILEGX_R_ZERO);
goto do_load_add;
case OE_IM(LD4S_ADD, X1):
memop = MO_TESL;
mnemonic = "ld4s_add";
mnemonic = "ld4s_add"; /* prefetch_add_l3_fault */
goto do_load_add;
case OE_IM(LD4U_ADD, X1):
memop = MO_TEUL;
mnemonic = "ld4u_add";
mnemonic = "ld4u_add"; /* prefetch_add_l3 */
prefetch_nofault = (dest == TILEGX_R_ZERO);
goto do_load_add;
case OE_IM(LDNT1S_ADD, X1):
memop = MO_SB;
@ -1545,7 +1555,9 @@ static TileExcp gen_rri_opcode(DisasContext *dc, unsigned opext,
memop = MO_TEQ;
mnemonic = "ld_add";
do_load_add:
tcg_gen_qemu_ld_tl(tdest, tsrca, dc->mmuidx, memop);
if (!prefetch_nofault) {
tcg_gen_qemu_ld_tl(tdest, tsrca, dc->mmuidx, memop);
}
tcg_gen_addi_tl(dest_gr(dc, srca), tsrca, imm);
break;
case OE_IM(LDNA_ADD, X1):