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tcg/riscv: Add slowpath load and store instructions 

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Michael Clark <mjc@sifive.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <1a0a7e8f3347764f212c5efa5c07c9be17efdec6.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
master
Alistair Francis 2018-12-19 19:19:11 +00:00 committed by Richard Henderson
parent 15840069e1
commit efbea94c76
1 changed files with 256 additions and 0 deletions
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256
tcg/riscv/tcg-target.inc.c
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@ -895,3 +895,259 @@ static void tcg_out_call(TCGContext *s, tcg_insn_unit *arg)
{
tcg_out_call_int(s, arg, false);
}
static void tcg_out_mb(TCGContext *s, TCGArg a0)
{
tcg_insn_unit insn = OPC_FENCE;
if (a0 & TCG_MO_LD_LD) {
insn |= 0x02200000;
}
if (a0 & TCG_MO_ST_LD) {
insn |= 0x01200000;
}
if (a0 & TCG_MO_LD_ST) {
insn |= 0x02100000;
}
if (a0 & TCG_MO_ST_ST) {
insn |= 0x02200000;
}
tcg_out32(s, insn);
}
/*
* Load/store and TLB
*/
#if defined(CONFIG_SOFTMMU)
#include "tcg-ldst.inc.c"
/* helper signature: helper_ret_ld_mmu(CPUState *env, target_ulong addr,
* TCGMemOpIdx oi, uintptr_t ra)
*/
static void * const qemu_ld_helpers[16] = {
[MO_UB] = helper_ret_ldub_mmu,
[MO_SB] = helper_ret_ldsb_mmu,
[MO_LEUW] = helper_le_lduw_mmu,
[MO_LESW] = helper_le_ldsw_mmu,
[MO_LEUL] = helper_le_ldul_mmu,
#if TCG_TARGET_REG_BITS == 64
[MO_LESL] = helper_le_ldsl_mmu,
#endif
[MO_LEQ] = helper_le_ldq_mmu,
[MO_BEUW] = helper_be_lduw_mmu,
[MO_BESW] = helper_be_ldsw_mmu,
[MO_BEUL] = helper_be_ldul_mmu,
#if TCG_TARGET_REG_BITS == 64
[MO_BESL] = helper_be_ldsl_mmu,
#endif
[MO_BEQ] = helper_be_ldq_mmu,
};
/* helper signature: helper_ret_st_mmu(CPUState *env, target_ulong addr,
* uintxx_t val, TCGMemOpIdx oi,
* uintptr_t ra)
*/
static void * const qemu_st_helpers[16] = {
[MO_UB] = helper_ret_stb_mmu,
[MO_LEUW] = helper_le_stw_mmu,
[MO_LEUL] = helper_le_stl_mmu,
[MO_LEQ] = helper_le_stq_mmu,
[MO_BEUW] = helper_be_stw_mmu,
[MO_BEUL] = helper_be_stl_mmu,
[MO_BEQ] = helper_be_stq_mmu,
};
static void tcg_out_tlb_load(TCGContext *s, TCGReg addrl,
TCGReg addrh, TCGMemOpIdx oi,
tcg_insn_unit **label_ptr, bool is_load)
{
TCGMemOp opc = get_memop(oi);
unsigned s_bits = opc & MO_SIZE;
unsigned a_bits = get_alignment_bits(opc);
target_ulong mask;
int mem_index = get_mmuidx(oi);
int cmp_off
= (is_load
? offsetof(CPUArchState, tlb_table[mem_index][0].addr_read)
: offsetof(CPUArchState, tlb_table[mem_index][0].addr_write));
int add_off = offsetof(CPUArchState, tlb_table[mem_index][0].addend);
RISCVInsn load_cmp_op = (TARGET_LONG_BITS == 64 ? OPC_LD :
TCG_TARGET_REG_BITS == 64 ? OPC_LWU : OPC_LW);
RISCVInsn load_add_op = TCG_TARGET_REG_BITS == 64 ? OPC_LD : OPC_LW;
TCGReg base = TCG_AREG0;
/* We don't support oversize guests */
if (TCG_TARGET_REG_BITS < TARGET_LONG_BITS) {
g_assert_not_reached();
}
/* We don't support unaligned accesses. */
if (a_bits < s_bits) {
a_bits = s_bits;
}
mask = (target_ulong)TARGET_PAGE_MASK | ((1 << a_bits) - 1);
/* Compensate for very large offsets. */
if (add_off >= 0x1000) {
int adj;
base = TCG_REG_TMP2;
if (cmp_off <= 2 * 0xfff) {
adj = 0xfff;
tcg_out_opc_imm(s, OPC_ADDI, base, TCG_AREG0, adj);
} else {
adj = cmp_off - sextreg(cmp_off, 0, 12);
tcg_debug_assert(add_off - adj >= -0x1000
&& add_off - adj < 0x1000);
tcg_out_opc_upper(s, OPC_LUI, base, adj);
tcg_out_opc_reg(s, OPC_ADD, base, base, TCG_AREG0);
}
add_off -= adj;
cmp_off -= adj;
}
/* Extract the page index. */
if (CPU_TLB_BITS + CPU_TLB_ENTRY_BITS < 12) {
tcg_out_opc_imm(s, OPC_SRLI, TCG_REG_TMP0, addrl,
TARGET_PAGE_BITS - CPU_TLB_ENTRY_BITS);
tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_TMP0, TCG_REG_TMP0,
MAKE_64BIT_MASK(CPU_TLB_ENTRY_BITS, CPU_TLB_BITS));
} else if (TARGET_PAGE_BITS >= 12) {
tcg_out_opc_upper(s, OPC_LUI, TCG_REG_TMP0,
MAKE_64BIT_MASK(TARGET_PAGE_BITS, CPU_TLB_BITS));
tcg_out_opc_reg(s, OPC_AND, TCG_REG_TMP0, TCG_REG_TMP0, addrl);
tcg_out_opc_imm(s, OPC_SRLI, TCG_REG_TMP0, TCG_REG_TMP0,
CPU_TLB_BITS - CPU_TLB_ENTRY_BITS);
} else {
tcg_out_opc_imm(s, OPC_SRLI, TCG_REG_TMP0, addrl, TARGET_PAGE_BITS);
tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_TMP0, TCG_REG_TMP0,
MAKE_64BIT_MASK(0, CPU_TLB_BITS));
tcg_out_opc_imm(s, OPC_SLLI, TCG_REG_TMP0, TCG_REG_TMP0,
CPU_TLB_ENTRY_BITS);
}
/* Add that to the base address to index the tlb. */
tcg_out_opc_reg(s, OPC_ADD, TCG_REG_TMP2, base, TCG_REG_TMP0);
base = TCG_REG_TMP2;
/* Load the tlb comparator and the addend. */
tcg_out_ldst(s, load_cmp_op, TCG_REG_TMP0, base, cmp_off);
tcg_out_ldst(s, load_add_op, TCG_REG_TMP2, base, add_off);
/* Clear the non-page, non-alignment bits from the address. */
if (mask == sextreg(mask, 0, 12)) {
tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_TMP1, addrl, mask);
} else {
tcg_out_movi(s, TCG_TYPE_REG, TCG_REG_TMP1, mask);
tcg_out_opc_reg(s, OPC_AND, TCG_REG_TMP1, TCG_REG_TMP1, addrl);
}
/* Compare masked address with the TLB entry. */
label_ptr[0] = s->code_ptr;
tcg_out_opc_branch(s, OPC_BNE, TCG_REG_TMP0, TCG_REG_TMP1, 0);
/* NOP to allow patching later */
tcg_out_opc_imm(s, OPC_ADDI, TCG_REG_ZERO, TCG_REG_ZERO, 0);
/* TODO: Move this out of line
* see:
* https://lists.nongnu.org/archive/html/qemu-devel/2018-11/msg02234.html
*/
/* TLB Hit - translate address using addend. */
if (TCG_TARGET_REG_BITS > TARGET_LONG_BITS) {
tcg_out_ext32u(s, TCG_REG_TMP0, addrl);
addrl = TCG_REG_TMP0;
}
tcg_out_opc_reg(s, OPC_ADD, TCG_REG_TMP0, TCG_REG_TMP2, addrl);
}
static void add_qemu_ldst_label(TCGContext *s, int is_ld, TCGMemOpIdx oi,
TCGType ext,
TCGReg datalo, TCGReg datahi,
TCGReg addrlo, TCGReg addrhi,
void *raddr, tcg_insn_unit **label_ptr)
{
TCGLabelQemuLdst *label = new_ldst_label(s);
label->is_ld = is_ld;
label->oi = oi;
label->type = ext;
label->datalo_reg = datalo;
label->datahi_reg = datahi;
label->addrlo_reg = addrlo;
label->addrhi_reg = addrhi;
label->raddr = raddr;
label->label_ptr[0] = label_ptr[0];
}
static void tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
{
TCGMemOpIdx oi = l->oi;
TCGMemOp opc = get_memop(oi);
TCGReg a0 = tcg_target_call_iarg_regs[0];
TCGReg a1 = tcg_target_call_iarg_regs[1];
TCGReg a2 = tcg_target_call_iarg_regs[2];
TCGReg a3 = tcg_target_call_iarg_regs[3];
/* We don't support oversize guests */
if (TCG_TARGET_REG_BITS < TARGET_LONG_BITS) {
g_assert_not_reached();
}
/* resolve label address */
patch_reloc(l->label_ptr[0], R_RISCV_BRANCH, (intptr_t) s->code_ptr, 0);
/* call load helper */
tcg_out_mov(s, TCG_TYPE_PTR, a0, TCG_AREG0);
tcg_out_mov(s, TCG_TYPE_PTR, a1, l->addrlo_reg);
tcg_out_movi(s, TCG_TYPE_PTR, a2, oi);
tcg_out_movi(s, TCG_TYPE_PTR, a3, (tcg_target_long)l->raddr);
tcg_out_call(s, qemu_ld_helpers[opc & (MO_BSWAP | MO_SSIZE)]);
tcg_out_mov(s, (opc & MO_SIZE) == MO_64, l->datalo_reg, a0);
tcg_out_goto(s, l->raddr);
}
static void tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
{
TCGMemOpIdx oi = l->oi;
TCGMemOp opc = get_memop(oi);
TCGMemOp s_bits = opc & MO_SIZE;
TCGReg a0 = tcg_target_call_iarg_regs[0];
TCGReg a1 = tcg_target_call_iarg_regs[1];
TCGReg a2 = tcg_target_call_iarg_regs[2];
TCGReg a3 = tcg_target_call_iarg_regs[3];
TCGReg a4 = tcg_target_call_iarg_regs[4];
/* We don't support oversize guests */
if (TCG_TARGET_REG_BITS < TARGET_LONG_BITS) {
g_assert_not_reached();
}
/* resolve label address */
patch_reloc(l->label_ptr[0], R_RISCV_BRANCH, (intptr_t) s->code_ptr, 0);
/* call store helper */
tcg_out_mov(s, TCG_TYPE_PTR, a0, TCG_AREG0);
tcg_out_mov(s, TCG_TYPE_PTR, a1, l->addrlo_reg);
tcg_out_mov(s, TCG_TYPE_PTR, a2, l->datalo_reg);
switch (s_bits) {
case MO_8:
tcg_out_ext8u(s, a2, a2);
break;
case MO_16:
tcg_out_ext16u(s, a2, a2);
break;
default:
break;
}
tcg_out_movi(s, TCG_TYPE_PTR, a3, oi);
tcg_out_movi(s, TCG_TYPE_PTR, a4, (tcg_target_long)l->raddr);
tcg_out_call(s, qemu_st_helpers[opc & (MO_BSWAP | MO_SSIZE)]);
tcg_out_goto(s, l->raddr);
}
#endif /* CONFIG_SOFTMMU */