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target-arm: implement LDA/STL instructions 

This adds support for the ARMv8 load acquire/store release instructions.
Since qemu does nothing special for memory barriers, these can be
emulated like their non-acquire/release counterparts.

Signed-off-by: Mans Rullgard <mans@mansr.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
master
Mans Rullgard 2013-07-15 14:35:25 +01:00 committed by Peter Maydell
parent 81e69fb093
commit 2359bf80c1
1 changed files with 119 additions and 10 deletions
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129
target-arm/translate.c
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@ -7274,14 +7274,72 @@ static void disas_arm_insn(CPUARMState * env, DisasContext *s)
rd = (insn >> 12) & 0xf;
if (insn & (1 << 23)) {
/* load/store exclusive */
int op2 = (insn >> 8) & 3;
op1 = (insn >> 21) & 0x3;
if (op1)
ARCH(6K);
else
ARCH(6);
switch (op2) {
case 0: /* lda/stl */
if (op1 == 1) {
goto illegal_op;
}
ARCH(8);
break;
case 1: /* reserved */
goto illegal_op;
case 2: /* ldaex/stlex */
ARCH(8);
break;
case 3: /* ldrex/strex */
if (op1) {
ARCH(6K);
} else {
ARCH(6);
}
break;
}
addr = tcg_temp_local_new_i32();
load_reg_var(s, addr, rn);
if (insn & (1 << 20)) {
/* Since the emulation does not have barriers,
the acquire/release semantics need no special
handling */
if (op2 == 0) {
if (insn & (1 << 20)) {
tmp = tcg_temp_new_i32();
switch (op1) {
case 0: /* lda */
tcg_gen_qemu_ld32u(tmp, addr, IS_USER(s));
break;
case 2: /* ldab */
tcg_gen_qemu_ld8u(tmp, addr, IS_USER(s));
break;
case 3: /* ldah */
tcg_gen_qemu_ld16u(tmp, addr, IS_USER(s));
break;
default:
abort();
}
store_reg(s, rd, tmp);
} else {
rm = insn & 0xf;
tmp = load_reg(s, rm);
switch (op1) {
case 0: /* stl */
tcg_gen_qemu_st32(tmp, addr, IS_USER(s));
break;
case 2: /* stlb */
tcg_gen_qemu_st8(tmp, addr, IS_USER(s));
break;
case 3: /* stlh */
tcg_gen_qemu_st16(tmp, addr, IS_USER(s));
break;
default:
abort();
}
tcg_temp_free_i32(tmp);
}
} else if (insn & (1 << 20)) {
switch (op1) {
case 0: /* ldrex */
gen_load_exclusive(s, rd, 15, addr, 2);
@ -8126,7 +8184,7 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw
gen_store_exclusive(s, rd, rs, 15, addr, 2);
}
tcg_temp_free_i32(addr);
} else if ((insn & (1 << 6)) == 0) {
} else if ((insn & (7 << 5)) == 0) {
/* Table Branch. */
if (rn == 15) {
addr = tcg_temp_new_i32();
@ -8152,15 +8210,66 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw
tcg_gen_addi_i32(tmp, tmp, s->pc);
store_reg(s, 15, tmp);
} else {
/* Load/store exclusive byte/halfword/doubleword. */
ARCH(7);
int op2 = (insn >> 6) & 0x3;
op = (insn >> 4) & 0x3;
if (op == 2) {
switch (op2) {
case 0:
goto illegal_op;
case 1:
/* Load/store exclusive byte/halfword/doubleword */
if (op == 2) {
goto illegal_op;
}
ARCH(7);
break;
case 2:
/* Load-acquire/store-release */
if (op == 3) {
goto illegal_op;
}
/* Fall through */
case 3:
/* Load-acquire/store-release exclusive */
ARCH(8);
break;
}
addr = tcg_temp_local_new_i32();
load_reg_var(s, addr, rn);
if (insn & (1 << 20)) {
if (!(op2 & 1)) {
if (insn & (1 << 20)) {
tmp = tcg_temp_new_i32();
switch (op) {
case 0: /* ldab */
tcg_gen_qemu_ld8u(tmp, addr, IS_USER(s));
break;
case 1: /* ldah */
tcg_gen_qemu_ld16u(tmp, addr, IS_USER(s));
break;
case 2: /* lda */
tcg_gen_qemu_ld32u(tmp, addr, IS_USER(s));
break;
default:
abort();
}
store_reg(s, rs, tmp);
} else {
tmp = load_reg(s, rs);
switch (op) {
case 0: /* stlb */
tcg_gen_qemu_st8(tmp, addr, IS_USER(s));
break;
case 1: /* stlh */
tcg_gen_qemu_st16(tmp, addr, IS_USER(s));
break;
case 2: /* stl */
tcg_gen_qemu_st32(tmp, addr, IS_USER(s));
break;
default:
abort();
}
tcg_temp_free_i32(tmp);
}
} else if (insn & (1 << 20)) {
gen_load_exclusive(s, rs, rd, addr, op);
} else {
gen_store_exclusive(s, rm, rs, rd, addr, op);