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qemu/target/riscv/translate.c
Palmer Dabbelt 3502dc824a
RISC-V: Respect fences for user-only emulators 
Our current fence implementation ignores fences for the user-only
configurations.  This is incorrect but unlikely to manifest: it requires
multi-threaded user-only code that takes advantage of the weakness in
the host's memory model and can be inlined by TCG.

This patch simply treats fences the same way for all our emulators.
I've given it to testing as I don't want to construct a test that would
actually trigger the failure.

Our fence implementation has an additional deficiency where we map all
RISC-V fences to full fences.  Now that we have a formal memory model
for RISC-V we can start to take advantage of the strength bits on our
fence instructions.  This requires a bit more though, so I'm going to
split it out because the implementation is still correct without taking
advantage of these weaker fences.

Thanks to Richard Henderson for pointing out both of the issues.

Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2018-11-13 15:12:15 -08:00

1936 lines
58 KiB
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/*
* RISC-V emulation for qemu: main translation routines.
*
* Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "cpu.h"
#include "tcg-op.h"
#include "disas/disas.h"
#include "exec/cpu_ldst.h"
#include "exec/exec-all.h"
#include "exec/helper-proto.h"
#include "exec/helper-gen.h"
#include "exec/translator.h"
#include "exec/log.h"
#include "instmap.h"
/* global register indices */
static TCGv cpu_gpr[32], cpu_pc;
static TCGv_i64 cpu_fpr[32]; /* assume F and D extensions */
static TCGv load_res;
static TCGv load_val;
#include "exec/gen-icount.h"
typedef struct DisasContext {
DisasContextBase base;
/* pc_succ_insn points to the instruction following base.pc_next */
target_ulong pc_succ_insn;
uint32_t opcode;
uint32_t flags;
uint32_t mem_idx;
/* Remember the rounding mode encoded in the previous fp instruction,
which we have already installed into env->fp_status. Or -1 for
no previous fp instruction. Note that we exit the TB when writing
to any system register, which includes CSR_FRM, so we do not have
to reset this known value. */
int frm;
} DisasContext;
/* convert riscv funct3 to qemu memop for load/store */
static const int tcg_memop_lookup[8] = {
[0 ... 7] = -1,
[0] = MO_SB,
[1] = MO_TESW,
[2] = MO_TESL,
[4] = MO_UB,
[5] = MO_TEUW,
#ifdef TARGET_RISCV64
[3] = MO_TEQ,
[6] = MO_TEUL,
#endif
};
#ifdef TARGET_RISCV64
#define CASE_OP_32_64(X) case X: case glue(X, W)
#else
#define CASE_OP_32_64(X) case X
#endif
static void generate_exception(DisasContext *ctx, int excp)
{
tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
TCGv_i32 helper_tmp = tcg_const_i32(excp);
gen_helper_raise_exception(cpu_env, helper_tmp);
tcg_temp_free_i32(helper_tmp);
ctx->base.is_jmp = DISAS_NORETURN;
}
static void generate_exception_mbadaddr(DisasContext *ctx, int excp)
{
tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
tcg_gen_st_tl(cpu_pc, cpu_env, offsetof(CPURISCVState, badaddr));
TCGv_i32 helper_tmp = tcg_const_i32(excp);
gen_helper_raise_exception(cpu_env, helper_tmp);
tcg_temp_free_i32(helper_tmp);
ctx->base.is_jmp = DISAS_NORETURN;
}
static void gen_exception_debug(void)
{
TCGv_i32 helper_tmp = tcg_const_i32(EXCP_DEBUG);
gen_helper_raise_exception(cpu_env, helper_tmp);
tcg_temp_free_i32(helper_tmp);
}
static void gen_exception_illegal(DisasContext *ctx)
{
generate_exception(ctx, RISCV_EXCP_ILLEGAL_INST);
}
static void gen_exception_inst_addr_mis(DisasContext *ctx)
{
generate_exception_mbadaddr(ctx, RISCV_EXCP_INST_ADDR_MIS);
}
static inline bool use_goto_tb(DisasContext *ctx, target_ulong dest)
{
if (unlikely(ctx->base.singlestep_enabled)) {
return false;
}
#ifndef CONFIG_USER_ONLY
return (ctx->base.tb->pc & TARGET_PAGE_MASK) == (dest & TARGET_PAGE_MASK);
#else
return true;
#endif
}
static void gen_goto_tb(DisasContext *ctx, int n, target_ulong dest)
{
if (use_goto_tb(ctx, dest)) {
/* chaining is only allowed when the jump is to the same page */
tcg_gen_goto_tb(n);
tcg_gen_movi_tl(cpu_pc, dest);
tcg_gen_exit_tb(ctx->base.tb, n);
} else {
tcg_gen_movi_tl(cpu_pc, dest);
if (ctx->base.singlestep_enabled) {
gen_exception_debug();
} else {
tcg_gen_lookup_and_goto_ptr();
}
}
}
/* Wrapper for getting reg values - need to check of reg is zero since
* cpu_gpr[0] is not actually allocated
*/
static inline void gen_get_gpr(TCGv t, int reg_num)
{
if (reg_num == 0) {
tcg_gen_movi_tl(t, 0);
} else {
tcg_gen_mov_tl(t, cpu_gpr[reg_num]);
}
}
/* Wrapper for setting reg values - need to check of reg is zero since
* cpu_gpr[0] is not actually allocated. this is more for safety purposes,
* since we usually avoid calling the OP_TYPE_gen function if we see a write to
* $zero
*/
static inline void gen_set_gpr(int reg_num_dst, TCGv t)
{
if (reg_num_dst != 0) {
tcg_gen_mov_tl(cpu_gpr[reg_num_dst], t);
}
}
static void gen_mulhsu(TCGv ret, TCGv arg1, TCGv arg2)
{
TCGv rl = tcg_temp_new();
TCGv rh = tcg_temp_new();
tcg_gen_mulu2_tl(rl, rh, arg1, arg2);
/* fix up for one negative */
tcg_gen_sari_tl(rl, arg1, TARGET_LONG_BITS - 1);
tcg_gen_and_tl(rl, rl, arg2);
tcg_gen_sub_tl(ret, rh, rl);
tcg_temp_free(rl);
tcg_temp_free(rh);
}
static void gen_fsgnj(DisasContext *ctx, uint32_t rd, uint32_t rs1,
uint32_t rs2, int rm, uint64_t min)
{
switch (rm) {
case 0: /* fsgnj */
if (rs1 == rs2) { /* FMOV */
tcg_gen_mov_i64(cpu_fpr[rd], cpu_fpr[rs1]);
} else {
tcg_gen_deposit_i64(cpu_fpr[rd], cpu_fpr[rs2], cpu_fpr[rs1],
0, min == INT32_MIN ? 31 : 63);
}
break;
case 1: /* fsgnjn */
if (rs1 == rs2) { /* FNEG */
tcg_gen_xori_i64(cpu_fpr[rd], cpu_fpr[rs1], min);
} else {
TCGv_i64 t0 = tcg_temp_new_i64();
tcg_gen_not_i64(t0, cpu_fpr[rs2]);
tcg_gen_deposit_i64(cpu_fpr[rd], t0, cpu_fpr[rs1],
0, min == INT32_MIN ? 31 : 63);
tcg_temp_free_i64(t0);
}
break;
case 2: /* fsgnjx */
if (rs1 == rs2) { /* FABS */
tcg_gen_andi_i64(cpu_fpr[rd], cpu_fpr[rs1], ~min);
} else {
TCGv_i64 t0 = tcg_temp_new_i64();
tcg_gen_andi_i64(t0, cpu_fpr[rs2], min);
tcg_gen_xor_i64(cpu_fpr[rd], cpu_fpr[rs1], t0);
tcg_temp_free_i64(t0);
}
break;
default:
gen_exception_illegal(ctx);
}
}
static void gen_arith(DisasContext *ctx, uint32_t opc, int rd, int rs1,
int rs2)
{
TCGv source1, source2, cond1, cond2, zeroreg, resultopt1;
source1 = tcg_temp_new();
source2 = tcg_temp_new();
gen_get_gpr(source1, rs1);
gen_get_gpr(source2, rs2);
switch (opc) {
CASE_OP_32_64(OPC_RISC_ADD):
tcg_gen_add_tl(source1, source1, source2);
break;
CASE_OP_32_64(OPC_RISC_SUB):
tcg_gen_sub_tl(source1, source1, source2);
break;
#if defined(TARGET_RISCV64)
case OPC_RISC_SLLW:
tcg_gen_andi_tl(source2, source2, 0x1F);
tcg_gen_shl_tl(source1, source1, source2);
break;
#endif
case OPC_RISC_SLL:
tcg_gen_andi_tl(source2, source2, TARGET_LONG_BITS - 1);
tcg_gen_shl_tl(source1, source1, source2);
break;
case OPC_RISC_SLT:
tcg_gen_setcond_tl(TCG_COND_LT, source1, source1, source2);
break;
case OPC_RISC_SLTU:
tcg_gen_setcond_tl(TCG_COND_LTU, source1, source1, source2);
break;
case OPC_RISC_XOR:
tcg_gen_xor_tl(source1, source1, source2);
break;
#if defined(TARGET_RISCV64)
case OPC_RISC_SRLW:
/* clear upper 32 */
tcg_gen_ext32u_tl(source1, source1);
tcg_gen_andi_tl(source2, source2, 0x1F);
tcg_gen_shr_tl(source1, source1, source2);
break;
#endif
case OPC_RISC_SRL:
tcg_gen_andi_tl(source2, source2, TARGET_LONG_BITS - 1);
tcg_gen_shr_tl(source1, source1, source2);
break;
#if defined(TARGET_RISCV64)
case OPC_RISC_SRAW:
/* first, trick to get it to act like working on 32 bits (get rid of
upper 32, sign extend to fill space) */
tcg_gen_ext32s_tl(source1, source1);
tcg_gen_andi_tl(source2, source2, 0x1F);
tcg_gen_sar_tl(source1, source1, source2);
break;
#endif
case OPC_RISC_SRA:
tcg_gen_andi_tl(source2, source2, TARGET_LONG_BITS - 1);
tcg_gen_sar_tl(source1, source1, source2);
break;
case OPC_RISC_OR:
tcg_gen_or_tl(source1, source1, source2);
break;
case OPC_RISC_AND:
tcg_gen_and_tl(source1, source1, source2);
break;
CASE_OP_32_64(OPC_RISC_MUL):
tcg_gen_mul_tl(source1, source1, source2);
break;
case OPC_RISC_MULH:
tcg_gen_muls2_tl(source2, source1, source1, source2);
break;
case OPC_RISC_MULHSU:
gen_mulhsu(source1, source1, source2);
break;
case OPC_RISC_MULHU:
tcg_gen_mulu2_tl(source2, source1, source1, source2);
break;
#if defined(TARGET_RISCV64)
case OPC_RISC_DIVW:
tcg_gen_ext32s_tl(source1, source1);
tcg_gen_ext32s_tl(source2, source2);
/* fall through to DIV */
#endif
case OPC_RISC_DIV:
/* Handle by altering args to tcg_gen_div to produce req'd results:
* For overflow: want source1 in source1 and 1 in source2
* For div by zero: want -1 in source1 and 1 in source2 -> -1 result */
cond1 = tcg_temp_new();
cond2 = tcg_temp_new();
zeroreg = tcg_const_tl(0);
resultopt1 = tcg_temp_new();
tcg_gen_movi_tl(resultopt1, (target_ulong)-1);
tcg_gen_setcondi_tl(TCG_COND_EQ, cond2, source2, (target_ulong)(~0L));
tcg_gen_setcondi_tl(TCG_COND_EQ, cond1, source1,
((target_ulong)1) << (TARGET_LONG_BITS - 1));
tcg_gen_and_tl(cond1, cond1, cond2); /* cond1 = overflow */
tcg_gen_setcondi_tl(TCG_COND_EQ, cond2, source2, 0); /* cond2 = div 0 */
/* if div by zero, set source1 to -1, otherwise don't change */
tcg_gen_movcond_tl(TCG_COND_EQ, source1, cond2, zeroreg, source1,
resultopt1);
/* if overflow or div by zero, set source2 to 1, else don't change */
tcg_gen_or_tl(cond1, cond1, cond2);
tcg_gen_movi_tl(resultopt1, (target_ulong)1);
tcg_gen_movcond_tl(TCG_COND_EQ, source2, cond1, zeroreg, source2,
resultopt1);
tcg_gen_div_tl(source1, source1, source2);
tcg_temp_free(cond1);
tcg_temp_free(cond2);
tcg_temp_free(zeroreg);
tcg_temp_free(resultopt1);
break;
#if defined(TARGET_RISCV64)
case OPC_RISC_DIVUW:
tcg_gen_ext32u_tl(source1, source1);
tcg_gen_ext32u_tl(source2, source2);
/* fall through to DIVU */
#endif
case OPC_RISC_DIVU:
cond1 = tcg_temp_new();
zeroreg = tcg_const_tl(0);
resultopt1 = tcg_temp_new();
tcg_gen_setcondi_tl(TCG_COND_EQ, cond1, source2, 0);
tcg_gen_movi_tl(resultopt1, (target_ulong)-1);
tcg_gen_movcond_tl(TCG_COND_EQ, source1, cond1, zeroreg, source1,
resultopt1);
tcg_gen_movi_tl(resultopt1, (target_ulong)1);
tcg_gen_movcond_tl(TCG_COND_EQ, source2, cond1, zeroreg, source2,
resultopt1);
tcg_gen_divu_tl(source1, source1, source2);
tcg_temp_free(cond1);
tcg_temp_free(zeroreg);
tcg_temp_free(resultopt1);
break;
#if defined(TARGET_RISCV64)
case OPC_RISC_REMW:
tcg_gen_ext32s_tl(source1, source1);
tcg_gen_ext32s_tl(source2, source2);
/* fall through to REM */
#endif
case OPC_RISC_REM:
cond1 = tcg_temp_new();
cond2 = tcg_temp_new();
zeroreg = tcg_const_tl(0);
resultopt1 = tcg_temp_new();
tcg_gen_movi_tl(resultopt1, 1L);
tcg_gen_setcondi_tl(TCG_COND_EQ, cond2, source2, (target_ulong)-1);
tcg_gen_setcondi_tl(TCG_COND_EQ, cond1, source1,
(target_ulong)1 << (TARGET_LONG_BITS - 1));
tcg_gen_and_tl(cond2, cond1, cond2); /* cond1 = overflow */
tcg_gen_setcondi_tl(TCG_COND_EQ, cond1, source2, 0); /* cond2 = div 0 */
/* if overflow or div by zero, set source2 to 1, else don't change */
tcg_gen_or_tl(cond2, cond1, cond2);
tcg_gen_movcond_tl(TCG_COND_EQ, source2, cond2, zeroreg, source2,
resultopt1);
tcg_gen_rem_tl(resultopt1, source1, source2);
/* if div by zero, just return the original dividend */
tcg_gen_movcond_tl(TCG_COND_EQ, source1, cond1, zeroreg, resultopt1,
source1);
tcg_temp_free(cond1);
tcg_temp_free(cond2);
tcg_temp_free(zeroreg);
tcg_temp_free(resultopt1);
break;
#if defined(TARGET_RISCV64)
case OPC_RISC_REMUW:
tcg_gen_ext32u_tl(source1, source1);
tcg_gen_ext32u_tl(source2, source2);
/* fall through to REMU */
#endif
case OPC_RISC_REMU:
cond1 = tcg_temp_new();
zeroreg = tcg_const_tl(0);
resultopt1 = tcg_temp_new();
tcg_gen_movi_tl(resultopt1, (target_ulong)1);
tcg_gen_setcondi_tl(TCG_COND_EQ, cond1, source2, 0);
tcg_gen_movcond_tl(TCG_COND_EQ, source2, cond1, zeroreg, source2,
resultopt1);
tcg_gen_remu_tl(resultopt1, source1, source2);
/* if div by zero, just return the original dividend */
tcg_gen_movcond_tl(TCG_COND_EQ, source1, cond1, zeroreg, resultopt1,
source1);
tcg_temp_free(cond1);
tcg_temp_free(zeroreg);
tcg_temp_free(resultopt1);
break;
default:
gen_exception_illegal(ctx);
return;
}
if (opc & 0x8) { /* sign extend for W instructions */
tcg_gen_ext32s_tl(source1, source1);
}
gen_set_gpr(rd, source1);
tcg_temp_free(source1);
tcg_temp_free(source2);
}
static void gen_arith_imm(DisasContext *ctx, uint32_t opc, int rd,
int rs1, target_long imm)
{
TCGv source1 = tcg_temp_new();
int shift_len = TARGET_LONG_BITS;
int shift_a;
gen_get_gpr(source1, rs1);
switch (opc) {
case OPC_RISC_ADDI:
#if defined(TARGET_RISCV64)
case OPC_RISC_ADDIW:
#endif
tcg_gen_addi_tl(source1, source1, imm);
break;
case OPC_RISC_SLTI:
tcg_gen_setcondi_tl(TCG_COND_LT, source1, source1, imm);
break;
case OPC_RISC_SLTIU:
tcg_gen_setcondi_tl(TCG_COND_LTU, source1, source1, imm);
break;
case OPC_RISC_XORI:
tcg_gen_xori_tl(source1, source1, imm);
break;
case OPC_RISC_ORI:
tcg_gen_ori_tl(source1, source1, imm);
break;
case OPC_RISC_ANDI:
tcg_gen_andi_tl(source1, source1, imm);
break;
#if defined(TARGET_RISCV64)
case OPC_RISC_SLLIW:
shift_len = 32;
/* FALLTHRU */
#endif
case OPC_RISC_SLLI:
if (imm >= shift_len) {
goto do_illegal;
}
tcg_gen_shli_tl(source1, source1, imm);
break;
#if defined(TARGET_RISCV64)
case OPC_RISC_SHIFT_RIGHT_IW:
shift_len = 32;
/* FALLTHRU */
#endif
case OPC_RISC_SHIFT_RIGHT_I:
/* differentiate on IMM */
shift_a = imm & 0x400;
imm &= 0x3ff;
if (imm >= shift_len) {
goto do_illegal;
}
if (imm != 0) {
if (shift_a) {
/* SRAI[W] */
tcg_gen_sextract_tl(source1, source1, imm, shift_len - imm);
} else {
/* SRLI[W] */
tcg_gen_extract_tl(source1, source1, imm, shift_len - imm);
}
/* No further sign-extension needed for W instructions. */
opc &= ~0x8;
}
break;
default:
do_illegal:
gen_exception_illegal(ctx);
return;
}
if (opc & 0x8) { /* sign-extend for W instructions */
tcg_gen_ext32s_tl(source1, source1);
}
gen_set_gpr(rd, source1);
tcg_temp_free(source1);
}
static void gen_jal(CPURISCVState *env, DisasContext *ctx, int rd,
target_ulong imm)
{
target_ulong next_pc;
/* check misaligned: */
next_pc = ctx->base.pc_next + imm;
if (!riscv_has_ext(env, RVC)) {
if ((next_pc & 0x3) != 0) {
gen_exception_inst_addr_mis(ctx);
return;
}
}
if (rd != 0) {
tcg_gen_movi_tl(cpu_gpr[rd], ctx->pc_succ_insn);
}
gen_goto_tb(ctx, 0, ctx->base.pc_next + imm); /* must use this for safety */
ctx->base.is_jmp = DISAS_NORETURN;
}
static void gen_jalr(CPURISCVState *env, DisasContext *ctx, uint32_t opc,
int rd, int rs1, target_long imm)
{
/* no chaining with JALR */
TCGLabel *misaligned = NULL;
TCGv t0 = tcg_temp_new();
switch (opc) {
case OPC_RISC_JALR:
gen_get_gpr(cpu_pc, rs1);
tcg_gen_addi_tl(cpu_pc, cpu_pc, imm);
tcg_gen_andi_tl(cpu_pc, cpu_pc, (target_ulong)-2);
if (!riscv_has_ext(env, RVC)) {
misaligned = gen_new_label();
tcg_gen_andi_tl(t0, cpu_pc, 0x2);
tcg_gen_brcondi_tl(TCG_COND_NE, t0, 0x0, misaligned);
}
if (rd != 0) {
tcg_gen_movi_tl(cpu_gpr[rd], ctx->pc_succ_insn);
}
tcg_gen_lookup_and_goto_ptr();
if (misaligned) {
gen_set_label(misaligned);
gen_exception_inst_addr_mis(ctx);
}
ctx->base.is_jmp = DISAS_NORETURN;
break;
default:
gen_exception_illegal(ctx);
break;
}
tcg_temp_free(t0);
}
static void gen_branch(CPURISCVState *env, DisasContext *ctx, uint32_t opc,
int rs1, int rs2, target_long bimm)
{
TCGLabel *l = gen_new_label();
TCGv source1, source2;
source1 = tcg_temp_new();
source2 = tcg_temp_new();
gen_get_gpr(source1, rs1);
gen_get_gpr(source2, rs2);
switch (opc) {
case OPC_RISC_BEQ:
tcg_gen_brcond_tl(TCG_COND_EQ, source1, source2, l);
break;
case OPC_RISC_BNE:
tcg_gen_brcond_tl(TCG_COND_NE, source1, source2, l);
break;
case OPC_RISC_BLT:
tcg_gen_brcond_tl(TCG_COND_LT, source1, source2, l);
break;
case OPC_RISC_BGE:
tcg_gen_brcond_tl(TCG_COND_GE, source1, source2, l);
break;
case OPC_RISC_BLTU:
tcg_gen_brcond_tl(TCG_COND_LTU, source1, source2, l);
break;
case OPC_RISC_BGEU:
tcg_gen_brcond_tl(TCG_COND_GEU, source1, source2, l);
break;
default:
gen_exception_illegal(ctx);
return;
}
tcg_temp_free(source1);
tcg_temp_free(source2);
gen_goto_tb(ctx, 1, ctx->pc_succ_insn);
gen_set_label(l); /* branch taken */
if (!riscv_has_ext(env, RVC) && ((ctx->base.pc_next + bimm) & 0x3)) {
/* misaligned */
gen_exception_inst_addr_mis(ctx);
} else {
gen_goto_tb(ctx, 0, ctx->base.pc_next + bimm);
}
ctx->base.is_jmp = DISAS_NORETURN;
}
static void gen_load(DisasContext *ctx, uint32_t opc, int rd, int rs1,
target_long imm)
{
TCGv t0 = tcg_temp_new();
TCGv t1 = tcg_temp_new();
gen_get_gpr(t0, rs1);
tcg_gen_addi_tl(t0, t0, imm);
int memop = tcg_memop_lookup[(opc >> 12) & 0x7];
if (memop < 0) {
gen_exception_illegal(ctx);
return;
}
tcg_gen_qemu_ld_tl(t1, t0, ctx->mem_idx, memop);
gen_set_gpr(rd, t1);
tcg_temp_free(t0);
tcg_temp_free(t1);
}
static void gen_store(DisasContext *ctx, uint32_t opc, int rs1, int rs2,
target_long imm)
{
TCGv t0 = tcg_temp_new();
TCGv dat = tcg_temp_new();
gen_get_gpr(t0, rs1);
tcg_gen_addi_tl(t0, t0, imm);
gen_get_gpr(dat, rs2);
int memop = tcg_memop_lookup[(opc >> 12) & 0x7];
if (memop < 0) {
gen_exception_illegal(ctx);
return;
}
tcg_gen_qemu_st_tl(dat, t0, ctx->mem_idx, memop);
tcg_temp_free(t0);
tcg_temp_free(dat);
}
static void gen_fp_load(DisasContext *ctx, uint32_t opc, int rd,
int rs1, target_long imm)
{
TCGv t0;
if (!(ctx->flags & TB_FLAGS_FP_ENABLE)) {
gen_exception_illegal(ctx);
return;
}
t0 = tcg_temp_new();
gen_get_gpr(t0, rs1);
tcg_gen_addi_tl(t0, t0, imm);
switch (opc) {
case OPC_RISC_FLW:
tcg_gen_qemu_ld_i64(cpu_fpr[rd], t0, ctx->mem_idx, MO_TEUL);
/* RISC-V requires NaN-boxing of narrower width floating point values */
tcg_gen_ori_i64(cpu_fpr[rd], cpu_fpr[rd], 0xffffffff00000000ULL);
break;
case OPC_RISC_FLD:
tcg_gen_qemu_ld_i64(cpu_fpr[rd], t0, ctx->mem_idx, MO_TEQ);
break;
default:
gen_exception_illegal(ctx);
break;
}
tcg_temp_free(t0);
}
static void gen_fp_store(DisasContext *ctx, uint32_t opc, int rs1,
int rs2, target_long imm)
{
TCGv t0;
if (!(ctx->flags & TB_FLAGS_FP_ENABLE)) {
gen_exception_illegal(ctx);
return;
}
t0 = tcg_temp_new();
gen_get_gpr(t0, rs1);
tcg_gen_addi_tl(t0, t0, imm);
switch (opc) {
case OPC_RISC_FSW:
tcg_gen_qemu_st_i64(cpu_fpr[rs2], t0, ctx->mem_idx, MO_TEUL);
break;
case OPC_RISC_FSD:
tcg_gen_qemu_st_i64(cpu_fpr[rs2], t0, ctx->mem_idx, MO_TEQ);
break;
default:
gen_exception_illegal(ctx);
break;
}
tcg_temp_free(t0);
}
static void gen_atomic(DisasContext *ctx, uint32_t opc,
int rd, int rs1, int rs2)
{
TCGv src1, src2, dat;
TCGLabel *l1, *l2;
TCGMemOp mop;
bool aq, rl;
/* Extract the size of the atomic operation. */
switch (extract32(opc, 12, 3)) {
case 2: /* 32-bit */
mop = MO_ALIGN | MO_TESL;
break;
#if defined(TARGET_RISCV64)
case 3: /* 64-bit */
mop = MO_ALIGN | MO_TEQ;
break;
#endif
default:
gen_exception_illegal(ctx);
return;
}
rl = extract32(opc, 25, 1);
aq = extract32(opc, 26, 1);
src1 = tcg_temp_new();
src2 = tcg_temp_new();
switch (MASK_OP_ATOMIC_NO_AQ_RL_SZ(opc)) {
case OPC_RISC_LR:
/* Put addr in load_res, data in load_val. */
gen_get_gpr(src1, rs1);
if (rl) {
tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL);
}
tcg_gen_qemu_ld_tl(load_val, src1, ctx->mem_idx, mop);
if (aq) {
tcg_gen_mb(TCG_MO_ALL | TCG_BAR_LDAQ);
}
tcg_gen_mov_tl(load_res, src1);
gen_set_gpr(rd, load_val);
break;
case OPC_RISC_SC:
l1 = gen_new_label();
l2 = gen_new_label();
dat = tcg_temp_new();
gen_get_gpr(src1, rs1);
tcg_gen_brcond_tl(TCG_COND_NE, load_res, src1, l1);
gen_get_gpr(src2, rs2);
/* Note that the TCG atomic primitives are SC,
so we can ignore AQ/RL along this path. */
tcg_gen_atomic_cmpxchg_tl(src1, load_res, load_val, src2,
ctx->mem_idx, mop);
tcg_gen_setcond_tl(TCG_COND_NE, dat, src1, load_val);
gen_set_gpr(rd, dat);
tcg_gen_br(l2);
gen_set_label(l1);
/* Address comparion failure. However, we still need to
provide the memory barrier implied by AQ/RL. */
tcg_gen_mb(TCG_MO_ALL + aq * TCG_BAR_LDAQ + rl * TCG_BAR_STRL);
tcg_gen_movi_tl(dat, 1);
gen_set_gpr(rd, dat);
gen_set_label(l2);
tcg_temp_free(dat);
break;
case OPC_RISC_AMOSWAP:
/* Note that the TCG atomic primitives are SC,
so we can ignore AQ/RL along this path. */
gen_get_gpr(src1, rs1);
gen_get_gpr(src2, rs2);
tcg_gen_atomic_xchg_tl(src2, src1, src2, ctx->mem_idx, mop);
gen_set_gpr(rd, src2);
break;
case OPC_RISC_AMOADD:
gen_get_gpr(src1, rs1);
gen_get_gpr(src2, rs2);
tcg_gen_atomic_fetch_add_tl(src2, src1, src2, ctx->mem_idx, mop);
gen_set_gpr(rd, src2);
break;
case OPC_RISC_AMOXOR:
gen_get_gpr(src1, rs1);
gen_get_gpr(src2, rs2);
tcg_gen_atomic_fetch_xor_tl(src2, src1, src2, ctx->mem_idx, mop);
gen_set_gpr(rd, src2);
break;
case OPC_RISC_AMOAND:
gen_get_gpr(src1, rs1);
gen_get_gpr(src2, rs2);
tcg_gen_atomic_fetch_and_tl(src2, src1, src2, ctx->mem_idx, mop);
gen_set_gpr(rd, src2);
break;
case OPC_RISC_AMOOR:
gen_get_gpr(src1, rs1);
gen_get_gpr(src2, rs2);
tcg_gen_atomic_fetch_or_tl(src2, src1, src2, ctx->mem_idx, mop);
gen_set_gpr(rd, src2);
break;
case OPC_RISC_AMOMIN:
gen_get_gpr(src1, rs1);
gen_get_gpr(src2, rs2);
tcg_gen_atomic_fetch_smin_tl(src2, src1, src2, ctx->mem_idx, mop);
gen_set_gpr(rd, src2);
break;
case OPC_RISC_AMOMAX:
gen_get_gpr(src1, rs1);
gen_get_gpr(src2, rs2);
tcg_gen_atomic_fetch_smax_tl(src2, src1, src2, ctx->mem_idx, mop);
gen_set_gpr(rd, src2);
break;
case OPC_RISC_AMOMINU:
gen_get_gpr(src1, rs1);
gen_get_gpr(src2, rs2);
tcg_gen_atomic_fetch_umin_tl(src2, src1, src2, ctx->mem_idx, mop);
gen_set_gpr(rd, src2);
break;
case OPC_RISC_AMOMAXU:
gen_get_gpr(src1, rs1);
gen_get_gpr(src2, rs2);
tcg_gen_atomic_fetch_umax_tl(src2, src1, src2, ctx->mem_idx, mop);
gen_set_gpr(rd, src2);
break;
default:
gen_exception_illegal(ctx);
break;
}
tcg_temp_free(src1);
tcg_temp_free(src2);
}
static void gen_set_rm(DisasContext *ctx, int rm)
{
TCGv_i32 t0;
if (ctx->frm == rm) {
return;
}
ctx->frm = rm;
t0 = tcg_const_i32(rm);
gen_helper_set_rounding_mode(cpu_env, t0);
tcg_temp_free_i32(t0);
}
static void gen_fp_fmadd(DisasContext *ctx, uint32_t opc, int rd,
int rs1, int rs2, int rs3, int rm)
{
switch (opc) {
case OPC_RISC_FMADD_S:
gen_set_rm(ctx, rm);
gen_helper_fmadd_s(cpu_fpr[rd], cpu_env, cpu_fpr[rs1],
cpu_fpr[rs2], cpu_fpr[rs3]);
break;
case OPC_RISC_FMADD_D:
gen_set_rm(ctx, rm);
gen_helper_fmadd_d(cpu_fpr[rd], cpu_env, cpu_fpr[rs1],
cpu_fpr[rs2], cpu_fpr[rs3]);
break;
default:
gen_exception_illegal(ctx);
break;
}
}
static void gen_fp_fmsub(DisasContext *ctx, uint32_t opc, int rd,
int rs1, int rs2, int rs3, int rm)
{
switch (opc) {
case OPC_RISC_FMSUB_S:
gen_set_rm(ctx, rm);
gen_helper_fmsub_s(cpu_fpr[rd], cpu_env, cpu_fpr[rs1],
cpu_fpr[rs2], cpu_fpr[rs3]);
break;
case OPC_RISC_FMSUB_D:
gen_set_rm(ctx, rm);
gen_helper_fmsub_d(cpu_fpr[rd], cpu_env, cpu_fpr[rs1],
cpu_fpr[rs2], cpu_fpr[rs3]);
break;
default:
gen_exception_illegal(ctx);
break;
}
}
static void gen_fp_fnmsub(DisasContext *ctx, uint32_t opc, int rd,
int rs1, int rs2, int rs3, int rm)
{
switch (opc) {
case OPC_RISC_FNMSUB_S:
gen_set_rm(ctx, rm);
gen_helper_fnmsub_s(cpu_fpr[rd], cpu_env, cpu_fpr[rs1],
cpu_fpr[rs2], cpu_fpr[rs3]);
break;
case OPC_RISC_FNMSUB_D:
gen_set_rm(ctx, rm);
gen_helper_fnmsub_d(cpu_fpr[rd], cpu_env, cpu_fpr[rs1],
cpu_fpr[rs2], cpu_fpr[rs3]);
break;
default:
gen_exception_illegal(ctx);
break;
}
}
static void gen_fp_fnmadd(DisasContext *ctx, uint32_t opc, int rd,
int rs1, int rs2, int rs3, int rm)
{
switch (opc) {
case OPC_RISC_FNMADD_S:
gen_set_rm(ctx, rm);
gen_helper_fnmadd_s(cpu_fpr[rd], cpu_env, cpu_fpr[rs1],
cpu_fpr[rs2], cpu_fpr[rs3]);
break;
case OPC_RISC_FNMADD_D:
gen_set_rm(ctx, rm);
gen_helper_fnmadd_d(cpu_fpr[rd], cpu_env, cpu_fpr[rs1],
cpu_fpr[rs2], cpu_fpr[rs3]);
break;
default:
gen_exception_illegal(ctx);
break;
}
}
static void gen_fp_arith(DisasContext *ctx, uint32_t opc, int rd,
int rs1, int rs2, int rm)
{
TCGv t0 = NULL;
if (!(ctx->flags & TB_FLAGS_FP_ENABLE)) {
goto do_illegal;
}
switch (opc) {
case OPC_RISC_FADD_S:
gen_set_rm(ctx, rm);
gen_helper_fadd_s(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
case OPC_RISC_FSUB_S:
gen_set_rm(ctx, rm);
gen_helper_fsub_s(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
case OPC_RISC_FMUL_S:
gen_set_rm(ctx, rm);
gen_helper_fmul_s(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
case OPC_RISC_FDIV_S:
gen_set_rm(ctx, rm);
gen_helper_fdiv_s(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
case OPC_RISC_FSQRT_S:
gen_set_rm(ctx, rm);
gen_helper_fsqrt_s(cpu_fpr[rd], cpu_env, cpu_fpr[rs1]);
break;
case OPC_RISC_FSGNJ_S:
gen_fsgnj(ctx, rd, rs1, rs2, rm, INT32_MIN);
break;
case OPC_RISC_FMIN_S:
/* also handles: OPC_RISC_FMAX_S */
switch (rm) {
case 0x0:
gen_helper_fmin_s(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
case 0x1:
gen_helper_fmax_s(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
default:
goto do_illegal;
}
break;
case OPC_RISC_FEQ_S:
/* also handles: OPC_RISC_FLT_S, OPC_RISC_FLE_S */
t0 = tcg_temp_new();
switch (rm) {
case 0x0:
gen_helper_fle_s(t0, cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
case 0x1:
gen_helper_flt_s(t0, cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
case 0x2:
gen_helper_feq_s(t0, cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
default:
goto do_illegal;
}
gen_set_gpr(rd, t0);
tcg_temp_free(t0);
break;
case OPC_RISC_FCVT_W_S:
/* also OPC_RISC_FCVT_WU_S, OPC_RISC_FCVT_L_S, OPC_RISC_FCVT_LU_S */
t0 = tcg_temp_new();
switch (rs2) {
case 0: /* FCVT_W_S */
gen_set_rm(ctx, rm);
gen_helper_fcvt_w_s(t0, cpu_env, cpu_fpr[rs1]);
break;
case 1: /* FCVT_WU_S */
gen_set_rm(ctx, rm);
gen_helper_fcvt_wu_s(t0, cpu_env, cpu_fpr[rs1]);
break;
#if defined(TARGET_RISCV64)
case 2: /* FCVT_L_S */
gen_set_rm(ctx, rm);
gen_helper_fcvt_l_s(t0, cpu_env, cpu_fpr[rs1]);
break;
case 3: /* FCVT_LU_S */
gen_set_rm(ctx, rm);
gen_helper_fcvt_lu_s(t0, cpu_env, cpu_fpr[rs1]);
break;
#endif
default:
goto do_illegal;
}
gen_set_gpr(rd, t0);
tcg_temp_free(t0);
break;
case OPC_RISC_FCVT_S_W:
/* also OPC_RISC_FCVT_S_WU, OPC_RISC_FCVT_S_L, OPC_RISC_FCVT_S_LU */
t0 = tcg_temp_new();
gen_get_gpr(t0, rs1);
switch (rs2) {
case 0: /* FCVT_S_W */
gen_set_rm(ctx, rm);
gen_helper_fcvt_s_w(cpu_fpr[rd], cpu_env, t0);
break;
case 1: /* FCVT_S_WU */
gen_set_rm(ctx, rm);
gen_helper_fcvt_s_wu(cpu_fpr[rd], cpu_env, t0);
break;
#if defined(TARGET_RISCV64)
case 2: /* FCVT_S_L */
gen_set_rm(ctx, rm);
gen_helper_fcvt_s_l(cpu_fpr[rd], cpu_env, t0);
break;
case 3: /* FCVT_S_LU */
gen_set_rm(ctx, rm);
gen_helper_fcvt_s_lu(cpu_fpr[rd], cpu_env, t0);
break;
#endif
default:
goto do_illegal;
}
tcg_temp_free(t0);
break;
case OPC_RISC_FMV_X_S:
/* also OPC_RISC_FCLASS_S */
t0 = tcg_temp_new();
switch (rm) {
case 0: /* FMV */
#if defined(TARGET_RISCV64)
tcg_gen_ext32s_tl(t0, cpu_fpr[rs1]);
#else
tcg_gen_extrl_i64_i32(t0, cpu_fpr[rs1]);
#endif
break;
case 1:
gen_helper_fclass_s(t0, cpu_fpr[rs1]);
break;
default:
goto do_illegal;
}
gen_set_gpr(rd, t0);
tcg_temp_free(t0);
break;
case OPC_RISC_FMV_S_X:
t0 = tcg_temp_new();
gen_get_gpr(t0, rs1);
#if defined(TARGET_RISCV64)
tcg_gen_mov_i64(cpu_fpr[rd], t0);
#else
tcg_gen_extu_i32_i64(cpu_fpr[rd], t0);
#endif
tcg_temp_free(t0);
break;
/* double */
case OPC_RISC_FADD_D:
gen_set_rm(ctx, rm);
gen_helper_fadd_d(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
case OPC_RISC_FSUB_D:
gen_set_rm(ctx, rm);
gen_helper_fsub_d(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
case OPC_RISC_FMUL_D:
gen_set_rm(ctx, rm);
gen_helper_fmul_d(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
case OPC_RISC_FDIV_D:
gen_set_rm(ctx, rm);
gen_helper_fdiv_d(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
case OPC_RISC_FSQRT_D:
gen_set_rm(ctx, rm);
gen_helper_fsqrt_d(cpu_fpr[rd], cpu_env, cpu_fpr[rs1]);
break;
case OPC_RISC_FSGNJ_D:
gen_fsgnj(ctx, rd, rs1, rs2, rm, INT64_MIN);
break;
case OPC_RISC_FMIN_D:
/* also OPC_RISC_FMAX_D */
switch (rm) {
case 0:
gen_helper_fmin_d(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
case 1:
gen_helper_fmax_d(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
default:
goto do_illegal;
}
break;
case OPC_RISC_FCVT_S_D:
switch (rs2) {
case 1:
gen_set_rm(ctx, rm);
gen_helper_fcvt_s_d(cpu_fpr[rd], cpu_env, cpu_fpr[rs1]);
break;
default:
goto do_illegal;
}
break;
case OPC_RISC_FCVT_D_S:
switch (rs2) {
case 0:
gen_set_rm(ctx, rm);
gen_helper_fcvt_d_s(cpu_fpr[rd], cpu_env, cpu_fpr[rs1]);
break;
default:
goto do_illegal;
}
break;
case OPC_RISC_FEQ_D:
/* also OPC_RISC_FLT_D, OPC_RISC_FLE_D */
t0 = tcg_temp_new();
switch (rm) {
case 0:
gen_helper_fle_d(t0, cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
case 1:
gen_helper_flt_d(t0, cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
case 2:
gen_helper_feq_d(t0, cpu_env, cpu_fpr[rs1], cpu_fpr[rs2]);
break;
default:
goto do_illegal;
}
gen_set_gpr(rd, t0);
tcg_temp_free(t0);
break;
case OPC_RISC_FCVT_W_D:
/* also OPC_RISC_FCVT_WU_D, OPC_RISC_FCVT_L_D, OPC_RISC_FCVT_LU_D */
t0 = tcg_temp_new();
switch (rs2) {
case 0:
gen_set_rm(ctx, rm);
gen_helper_fcvt_w_d(t0, cpu_env, cpu_fpr[rs1]);
break;
case 1:
gen_set_rm(ctx, rm);
gen_helper_fcvt_wu_d(t0, cpu_env, cpu_fpr[rs1]);
break;
#if defined(TARGET_RISCV64)
case 2:
gen_set_rm(ctx, rm);
gen_helper_fcvt_l_d(t0, cpu_env, cpu_fpr[rs1]);
break;
case 3:
gen_set_rm(ctx, rm);
gen_helper_fcvt_lu_d(t0, cpu_env, cpu_fpr[rs1]);
break;
#endif
default:
goto do_illegal;
}
gen_set_gpr(rd, t0);
tcg_temp_free(t0);
break;
case OPC_RISC_FCVT_D_W:
/* also OPC_RISC_FCVT_D_WU, OPC_RISC_FCVT_D_L, OPC_RISC_FCVT_D_LU */
t0 = tcg_temp_new();
gen_get_gpr(t0, rs1);
switch (rs2) {
case 0:
gen_set_rm(ctx, rm);
gen_helper_fcvt_d_w(cpu_fpr[rd], cpu_env, t0);
break;
case 1:
gen_set_rm(ctx, rm);
gen_helper_fcvt_d_wu(cpu_fpr[rd], cpu_env, t0);
break;
#if defined(TARGET_RISCV64)
case 2:
gen_set_rm(ctx, rm);
gen_helper_fcvt_d_l(cpu_fpr[rd], cpu_env, t0);
break;
case 3:
gen_set_rm(ctx, rm);
gen_helper_fcvt_d_lu(cpu_fpr[rd], cpu_env, t0);
break;
#endif
default:
goto do_illegal;
}
tcg_temp_free(t0);
break;
case OPC_RISC_FMV_X_D:
/* also OPC_RISC_FCLASS_D */
switch (rm) {
#if defined(TARGET_RISCV64)
case 0: /* FMV */
gen_set_gpr(rd, cpu_fpr[rs1]);
break;
#endif
case 1:
t0 = tcg_temp_new();
gen_helper_fclass_d(t0, cpu_fpr[rs1]);
gen_set_gpr(rd, t0);
tcg_temp_free(t0);
break;
default:
goto do_illegal;
}
break;
#if defined(TARGET_RISCV64)
case OPC_RISC_FMV_D_X:
t0 = tcg_temp_new();
gen_get_gpr(t0, rs1);
tcg_gen_mov_tl(cpu_fpr[rd], t0);
tcg_temp_free(t0);
break;
#endif
default:
do_illegal:
if (t0) {
tcg_temp_free(t0);
}
gen_exception_illegal(ctx);
break;
}
}
static void gen_system(CPURISCVState *env, DisasContext *ctx, uint32_t opc,
int rd, int rs1, int csr)
{
TCGv source1, csr_store, dest, rs1_pass, imm_rs1;
source1 = tcg_temp_new();
csr_store = tcg_temp_new();
dest = tcg_temp_new();
rs1_pass = tcg_temp_new();
imm_rs1 = tcg_temp_new();
gen_get_gpr(source1, rs1);
tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
tcg_gen_movi_tl(rs1_pass, rs1);
tcg_gen_movi_tl(csr_store, csr); /* copy into temp reg to feed to helper */
#ifndef CONFIG_USER_ONLY
/* Extract funct7 value and check whether it matches SFENCE.VMA */
if ((opc == OPC_RISC_ECALL) && ((csr >> 5) == 9)) {
if (env->priv_ver == PRIV_VERSION_1_10_0) {
/* sfence.vma */
/* TODO: handle ASID specific fences */
gen_helper_tlb_flush(cpu_env);
return;
} else {
gen_exception_illegal(ctx);
}
}
#endif
switch (opc) {
case OPC_RISC_ECALL:
switch (csr) {
case 0x0: /* ECALL */
/* always generates U-level ECALL, fixed in do_interrupt handler */
generate_exception(ctx, RISCV_EXCP_U_ECALL);
tcg_gen_exit_tb(NULL, 0); /* no chaining */
ctx->base.is_jmp = DISAS_NORETURN;
break;
case 0x1: /* EBREAK */
generate_exception(ctx, RISCV_EXCP_BREAKPOINT);
tcg_gen_exit_tb(NULL, 0); /* no chaining */
ctx->base.is_jmp = DISAS_NORETURN;
break;
#ifndef CONFIG_USER_ONLY
case 0x002: /* URET */
gen_exception_illegal(ctx);
break;
case 0x102: /* SRET */
if (riscv_has_ext(env, RVS)) {
gen_helper_sret(cpu_pc, cpu_env, cpu_pc);
tcg_gen_exit_tb(NULL, 0); /* no chaining */
ctx->base.is_jmp = DISAS_NORETURN;
} else {
gen_exception_illegal(ctx);
}
break;
case 0x202: /* HRET */
gen_exception_illegal(ctx);
break;
case 0x302: /* MRET */
gen_helper_mret(cpu_pc, cpu_env, cpu_pc);
tcg_gen_exit_tb(NULL, 0); /* no chaining */
ctx->base.is_jmp = DISAS_NORETURN;
break;
case 0x7b2: /* DRET */
gen_exception_illegal(ctx);
break;
case 0x105: /* WFI */
tcg_gen_movi_tl(cpu_pc, ctx->pc_succ_insn);
gen_helper_wfi(cpu_env);
break;
case 0x104: /* SFENCE.VM */
if (env->priv_ver <= PRIV_VERSION_1_09_1) {
gen_helper_tlb_flush(cpu_env);
} else {
gen_exception_illegal(ctx);
}
break;
#endif
default:
gen_exception_illegal(ctx);
break;
}
break;
default:
tcg_gen_movi_tl(imm_rs1, rs1);
gen_io_start();
switch (opc) {
case OPC_RISC_CSRRW:
gen_helper_csrrw(dest, cpu_env, source1, csr_store);
break;
case OPC_RISC_CSRRS:
gen_helper_csrrs(dest, cpu_env, source1, csr_store, rs1_pass);
break;
case OPC_RISC_CSRRC:
gen_helper_csrrc(dest, cpu_env, source1, csr_store, rs1_pass);
break;
case OPC_RISC_CSRRWI:
gen_helper_csrrw(dest, cpu_env, imm_rs1, csr_store);
break;
case OPC_RISC_CSRRSI:
gen_helper_csrrs(dest, cpu_env, imm_rs1, csr_store, rs1_pass);
break;
case OPC_RISC_CSRRCI:
gen_helper_csrrc(dest, cpu_env, imm_rs1, csr_store, rs1_pass);
break;
default:
gen_exception_illegal(ctx);
return;
}
gen_io_end();
gen_set_gpr(rd, dest);
/* end tb since we may be changing priv modes, to get mmu_index right */
tcg_gen_movi_tl(cpu_pc, ctx->pc_succ_insn);
tcg_gen_exit_tb(NULL, 0); /* no chaining */
ctx->base.is_jmp = DISAS_NORETURN;
break;
}
tcg_temp_free(source1);
tcg_temp_free(csr_store);
tcg_temp_free(dest);
tcg_temp_free(rs1_pass);
tcg_temp_free(imm_rs1);
}
static void decode_RV32_64C0(DisasContext *ctx)
{
uint8_t funct3 = extract32(ctx->opcode, 13, 3);
uint8_t rd_rs2 = GET_C_RS2S(ctx->opcode);
uint8_t rs1s = GET_C_RS1S(ctx->opcode);
switch (funct3) {
case 0:
/* illegal */
if (ctx->opcode == 0) {
gen_exception_illegal(ctx);
} else {
/* C.ADDI4SPN -> addi rd', x2, zimm[9:2]*/
gen_arith_imm(ctx, OPC_RISC_ADDI, rd_rs2, 2,
GET_C_ADDI4SPN_IMM(ctx->opcode));
}
break;
case 1:
/* C.FLD -> fld rd', offset[7:3](rs1')*/
gen_fp_load(ctx, OPC_RISC_FLD, rd_rs2, rs1s,
GET_C_LD_IMM(ctx->opcode));
/* C.LQ(RV128) */
break;
case 2:
/* C.LW -> lw rd', offset[6:2](rs1') */
gen_load(ctx, OPC_RISC_LW, rd_rs2, rs1s,
GET_C_LW_IMM(ctx->opcode));
break;
case 3:
#if defined(TARGET_RISCV64)
/* C.LD(RV64/128) -> ld rd', offset[7:3](rs1')*/
gen_load(ctx, OPC_RISC_LD, rd_rs2, rs1s,
GET_C_LD_IMM(ctx->opcode));
#else
/* C.FLW (RV32) -> flw rd', offset[6:2](rs1')*/
gen_fp_load(ctx, OPC_RISC_FLW, rd_rs2, rs1s,
GET_C_LW_IMM(ctx->opcode));
#endif
break;
case 4:
/* reserved */
gen_exception_illegal(ctx);
break;
case 5:
/* C.FSD(RV32/64) -> fsd rs2', offset[7:3](rs1') */
gen_fp_store(ctx, OPC_RISC_FSD, rs1s, rd_rs2,
GET_C_LD_IMM(ctx->opcode));
/* C.SQ (RV128) */
break;
case 6:
/* C.SW -> sw rs2', offset[6:2](rs1')*/
gen_store(ctx, OPC_RISC_SW, rs1s, rd_rs2,
GET_C_LW_IMM(ctx->opcode));
break;
case 7:
#if defined(TARGET_RISCV64)
/* C.SD (RV64/128) -> sd rs2', offset[7:3](rs1')*/
gen_store(ctx, OPC_RISC_SD, rs1s, rd_rs2,
GET_C_LD_IMM(ctx->opcode));
#else
/* C.FSW (RV32) -> fsw rs2', offset[6:2](rs1')*/
gen_fp_store(ctx, OPC_RISC_FSW, rs1s, rd_rs2,
GET_C_LW_IMM(ctx->opcode));
#endif
break;
}
}
static void decode_RV32_64C1(CPURISCVState *env, DisasContext *ctx)
{
uint8_t funct3 = extract32(ctx->opcode, 13, 3);
uint8_t rd_rs1 = GET_C_RS1(ctx->opcode);
uint8_t rs1s, rs2s;
uint8_t funct2;
switch (funct3) {
case 0:
/* C.ADDI -> addi rd, rd, nzimm[5:0] */
gen_arith_imm(ctx, OPC_RISC_ADDI, rd_rs1, rd_rs1,
GET_C_IMM(ctx->opcode));
break;
case 1:
#if defined(TARGET_RISCV64)
/* C.ADDIW (RV64/128) -> addiw rd, rd, imm[5:0]*/
gen_arith_imm(ctx, OPC_RISC_ADDIW, rd_rs1, rd_rs1,
GET_C_IMM(ctx->opcode));
#else
/* C.JAL(RV32) -> jal x1, offset[11:1] */
gen_jal(env, ctx, 1, GET_C_J_IMM(ctx->opcode));
#endif
break;
case 2:
/* C.LI -> addi rd, x0, imm[5:0]*/
gen_arith_imm(ctx, OPC_RISC_ADDI, rd_rs1, 0, GET_C_IMM(ctx->opcode));
break;
case 3:
if (rd_rs1 == 2) {
/* C.ADDI16SP -> addi x2, x2, nzimm[9:4]*/
gen_arith_imm(ctx, OPC_RISC_ADDI, 2, 2,
GET_C_ADDI16SP_IMM(ctx->opcode));
} else if (rd_rs1 != 0) {
/* C.LUI (rs1/rd =/= {0,2}) -> lui rd, nzimm[17:12]*/
tcg_gen_movi_tl(cpu_gpr[rd_rs1],
GET_C_IMM(ctx->opcode) << 12);
}
break;
case 4:
funct2 = extract32(ctx->opcode, 10, 2);
rs1s = GET_C_RS1S(ctx->opcode);
switch (funct2) {
case 0: /* C.SRLI(RV32) -> srli rd', rd', shamt[5:0] */
gen_arith_imm(ctx, OPC_RISC_SHIFT_RIGHT_I, rs1s, rs1s,
GET_C_ZIMM(ctx->opcode));
/* C.SRLI64(RV128) */
break;
case 1:
/* C.SRAI -> srai rd', rd', shamt[5:0]*/
gen_arith_imm(ctx, OPC_RISC_SHIFT_RIGHT_I, rs1s, rs1s,
GET_C_ZIMM(ctx->opcode) | 0x400);
/* C.SRAI64(RV128) */
break;
case 2:
/* C.ANDI -> andi rd', rd', imm[5:0]*/
gen_arith_imm(ctx, OPC_RISC_ANDI, rs1s, rs1s,
GET_C_IMM(ctx->opcode));
break;
case 3:
funct2 = extract32(ctx->opcode, 5, 2);
rs2s = GET_C_RS2S(ctx->opcode);
switch (funct2) {
case 0:
/* C.SUB -> sub rd', rd', rs2' */
if (extract32(ctx->opcode, 12, 1) == 0) {
gen_arith(ctx, OPC_RISC_SUB, rs1s, rs1s, rs2s);
}
#if defined(TARGET_RISCV64)
else {
gen_arith(ctx, OPC_RISC_SUBW, rs1s, rs1s, rs2s);
}
#endif
break;
case 1:
/* C.XOR -> xor rs1', rs1', rs2' */
if (extract32(ctx->opcode, 12, 1) == 0) {
gen_arith(ctx, OPC_RISC_XOR, rs1s, rs1s, rs2s);
}
#if defined(TARGET_RISCV64)
else {
/* C.ADDW (RV64/128) */
gen_arith(ctx, OPC_RISC_ADDW, rs1s, rs1s, rs2s);
}
#endif
break;
case 2:
/* C.OR -> or rs1', rs1', rs2' */
gen_arith(ctx, OPC_RISC_OR, rs1s, rs1s, rs2s);
break;
case 3:
/* C.AND -> and rs1', rs1', rs2' */
gen_arith(ctx, OPC_RISC_AND, rs1s, rs1s, rs2s);
break;
}
break;
}
break;
case 5:
/* C.J -> jal x0, offset[11:1]*/
gen_jal(env, ctx, 0, GET_C_J_IMM(ctx->opcode));
break;
case 6:
/* C.BEQZ -> beq rs1', x0, offset[8:1]*/
rs1s = GET_C_RS1S(ctx->opcode);
gen_branch(env, ctx, OPC_RISC_BEQ, rs1s, 0, GET_C_B_IMM(ctx->opcode));
break;
case 7:
/* C.BNEZ -> bne rs1', x0, offset[8:1]*/
rs1s = GET_C_RS1S(ctx->opcode);
gen_branch(env, ctx, OPC_RISC_BNE, rs1s, 0, GET_C_B_IMM(ctx->opcode));
break;
}
}
static void decode_RV32_64C2(CPURISCVState *env, DisasContext *ctx)
{
uint8_t rd, rs2;
uint8_t funct3 = extract32(ctx->opcode, 13, 3);
rd = GET_RD(ctx->opcode);
switch (funct3) {
case 0: /* C.SLLI -> slli rd, rd, shamt[5:0]
C.SLLI64 -> */
gen_arith_imm(ctx, OPC_RISC_SLLI, rd, rd, GET_C_ZIMM(ctx->opcode));
break;
case 1: /* C.FLDSP(RV32/64DC) -> fld rd, offset[8:3](x2) */
gen_fp_load(ctx, OPC_RISC_FLD, rd, 2, GET_C_LDSP_IMM(ctx->opcode));
break;
case 2: /* C.LWSP -> lw rd, offset[7:2](x2) */
gen_load(ctx, OPC_RISC_LW, rd, 2, GET_C_LWSP_IMM(ctx->opcode));
break;
case 3:
#if defined(TARGET_RISCV64)
/* C.LDSP(RVC64) -> ld rd, offset[8:3](x2) */
gen_load(ctx, OPC_RISC_LD, rd, 2, GET_C_LDSP_IMM(ctx->opcode));
#else
/* C.FLWSP(RV32FC) -> flw rd, offset[7:2](x2) */
gen_fp_load(ctx, OPC_RISC_FLW, rd, 2, GET_C_LWSP_IMM(ctx->opcode));
#endif
break;
case 4:
rs2 = GET_C_RS2(ctx->opcode);
if (extract32(ctx->opcode, 12, 1) == 0) {
if (rs2 == 0) {
/* C.JR -> jalr x0, rs1, 0*/
gen_jalr(env, ctx, OPC_RISC_JALR, 0, rd, 0);
} else {
/* C.MV -> add rd, x0, rs2 */
gen_arith(ctx, OPC_RISC_ADD, rd, 0, rs2);
}
} else {
if (rd == 0) {
/* C.EBREAK -> ebreak*/
gen_system(env, ctx, OPC_RISC_ECALL, 0, 0, 0x1);
} else {
if (rs2 == 0) {
/* C.JALR -> jalr x1, rs1, 0*/
gen_jalr(env, ctx, OPC_RISC_JALR, 1, rd, 0);
} else {
/* C.ADD -> add rd, rd, rs2 */
gen_arith(ctx, OPC_RISC_ADD, rd, rd, rs2);
}
}
}
break;
case 5:
/* C.FSDSP -> fsd rs2, offset[8:3](x2)*/
gen_fp_store(ctx, OPC_RISC_FSD, 2, GET_C_RS2(ctx->opcode),
GET_C_SDSP_IMM(ctx->opcode));
/* C.SQSP */
break;
case 6: /* C.SWSP -> sw rs2, offset[7:2](x2)*/
gen_store(ctx, OPC_RISC_SW, 2, GET_C_RS2(ctx->opcode),
GET_C_SWSP_IMM(ctx->opcode));
break;
case 7:
#if defined(TARGET_RISCV64)
/* C.SDSP(Rv64/128) -> sd rs2, offset[8:3](x2)*/
gen_store(ctx, OPC_RISC_SD, 2, GET_C_RS2(ctx->opcode),
GET_C_SDSP_IMM(ctx->opcode));
#else
/* C.FSWSP(RV32) -> fsw rs2, offset[7:2](x2) */
gen_fp_store(ctx, OPC_RISC_FSW, 2, GET_C_RS2(ctx->opcode),
GET_C_SWSP_IMM(ctx->opcode));
#endif
break;
}
}
static void decode_RV32_64C(CPURISCVState *env, DisasContext *ctx)
{
uint8_t op = extract32(ctx->opcode, 0, 2);
switch (op) {
case 0:
decode_RV32_64C0(ctx);
break;
case 1:
decode_RV32_64C1(env, ctx);
break;
case 2:
decode_RV32_64C2(env, ctx);
break;
}
}
static void decode_RV32_64G(CPURISCVState *env, DisasContext *ctx)
{
int rs1;
int rs2;
int rd;
uint32_t op;
target_long imm;
/* We do not do misaligned address check here: the address should never be
* misaligned at this point. Instructions that set PC must do the check,
* since epc must be the address of the instruction that caused us to
* perform the misaligned instruction fetch */
op = MASK_OP_MAJOR(ctx->opcode);
rs1 = GET_RS1(ctx->opcode);
rs2 = GET_RS2(ctx->opcode);
rd = GET_RD(ctx->opcode);
imm = GET_IMM(ctx->opcode);
switch (op) {
case OPC_RISC_LUI:
if (rd == 0) {
break; /* NOP */
}
tcg_gen_movi_tl(cpu_gpr[rd], sextract64(ctx->opcode, 12, 20) << 12);
break;
case OPC_RISC_AUIPC:
if (rd == 0) {
break; /* NOP */
}
tcg_gen_movi_tl(cpu_gpr[rd], (sextract64(ctx->opcode, 12, 20) << 12) +
ctx->base.pc_next);
break;
case OPC_RISC_JAL:
imm = GET_JAL_IMM(ctx->opcode);
gen_jal(env, ctx, rd, imm);
break;
case OPC_RISC_JALR:
gen_jalr(env, ctx, MASK_OP_JALR(ctx->opcode), rd, rs1, imm);
break;
case OPC_RISC_BRANCH:
gen_branch(env, ctx, MASK_OP_BRANCH(ctx->opcode), rs1, rs2,
GET_B_IMM(ctx->opcode));
break;
case OPC_RISC_LOAD:
gen_load(ctx, MASK_OP_LOAD(ctx->opcode), rd, rs1, imm);
break;
case OPC_RISC_STORE:
gen_store(ctx, MASK_OP_STORE(ctx->opcode), rs1, rs2,
GET_STORE_IMM(ctx->opcode));
break;
case OPC_RISC_ARITH_IMM:
#if defined(TARGET_RISCV64)
case OPC_RISC_ARITH_IMM_W:
#endif
if (rd == 0) {
break; /* NOP */
}
gen_arith_imm(ctx, MASK_OP_ARITH_IMM(ctx->opcode), rd, rs1, imm);
break;
case OPC_RISC_ARITH:
#if defined(TARGET_RISCV64)
case OPC_RISC_ARITH_W:
#endif
if (rd == 0) {
break; /* NOP */
}
gen_arith(ctx, MASK_OP_ARITH(ctx->opcode), rd, rs1, rs2);
break;
case OPC_RISC_FP_LOAD:
gen_fp_load(ctx, MASK_OP_FP_LOAD(ctx->opcode), rd, rs1, imm);
break;
case OPC_RISC_FP_STORE:
gen_fp_store(ctx, MASK_OP_FP_STORE(ctx->opcode), rs1, rs2,
GET_STORE_IMM(ctx->opcode));
break;
case OPC_RISC_ATOMIC:
gen_atomic(ctx, MASK_OP_ATOMIC(ctx->opcode), rd, rs1, rs2);
break;
case OPC_RISC_FMADD:
gen_fp_fmadd(ctx, MASK_OP_FP_FMADD(ctx->opcode), rd, rs1, rs2,
GET_RS3(ctx->opcode), GET_RM(ctx->opcode));
break;
case OPC_RISC_FMSUB:
gen_fp_fmsub(ctx, MASK_OP_FP_FMSUB(ctx->opcode), rd, rs1, rs2,
GET_RS3(ctx->opcode), GET_RM(ctx->opcode));
break;
case OPC_RISC_FNMSUB:
gen_fp_fnmsub(ctx, MASK_OP_FP_FNMSUB(ctx->opcode), rd, rs1, rs2,
GET_RS3(ctx->opcode), GET_RM(ctx->opcode));
break;
case OPC_RISC_FNMADD:
gen_fp_fnmadd(ctx, MASK_OP_FP_FNMADD(ctx->opcode), rd, rs1, rs2,
GET_RS3(ctx->opcode), GET_RM(ctx->opcode));
break;
case OPC_RISC_FP_ARITH:
gen_fp_arith(ctx, MASK_OP_FP_ARITH(ctx->opcode), rd, rs1, rs2,
GET_RM(ctx->opcode));
break;
case OPC_RISC_FENCE:
if (ctx->opcode & 0x1000) {
/* FENCE_I is a no-op in QEMU,
* however we need to end the translation block */
tcg_gen_movi_tl(cpu_pc, ctx->pc_succ_insn);
tcg_gen_exit_tb(NULL, 0);
ctx->base.is_jmp = DISAS_NORETURN;
} else {
/* FENCE is a full memory barrier. */
tcg_gen_mb(TCG_MO_ALL | TCG_BAR_SC);
}
break;
case OPC_RISC_SYSTEM:
gen_system(env, ctx, MASK_OP_SYSTEM(ctx->opcode), rd, rs1,
(ctx->opcode & 0xFFF00000) >> 20);
break;
default:
gen_exception_illegal(ctx);
break;
}
}
static void decode_opc(CPURISCVState *env, DisasContext *ctx)
{
/* check for compressed insn */
if (extract32(ctx->opcode, 0, 2) != 3) {
if (!riscv_has_ext(env, RVC)) {
gen_exception_illegal(ctx);
} else {
ctx->pc_succ_insn = ctx->base.pc_next + 2;
decode_RV32_64C(env, ctx);
}
} else {
ctx->pc_succ_insn = ctx->base.pc_next + 4;
decode_RV32_64G(env, ctx);
}
}
static void riscv_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
{
DisasContext *ctx = container_of(dcbase, DisasContext, base);
ctx->pc_succ_insn = ctx->base.pc_first;
ctx->flags = ctx->base.tb->flags;
ctx->mem_idx = ctx->base.tb->flags & TB_FLAGS_MMU_MASK;
ctx->frm = -1; /* unknown rounding mode */
}
static void riscv_tr_tb_start(DisasContextBase *db, CPUState *cpu)
{
}
static void riscv_tr_insn_start(DisasContextBase *dcbase, CPUState *cpu)
{
DisasContext *ctx = container_of(dcbase, DisasContext, base);
tcg_gen_insn_start(ctx->base.pc_next);
}
static bool riscv_tr_breakpoint_check(DisasContextBase *dcbase, CPUState *cpu,
const CPUBreakpoint *bp)
{
DisasContext *ctx = container_of(dcbase, DisasContext, base);
tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
ctx->base.is_jmp = DISAS_NORETURN;
gen_exception_debug();
/* The address covered by the breakpoint must be included in
[tb->pc, tb->pc + tb->size) in order to for it to be
properly cleared -- thus we increment the PC here so that
the logic setting tb->size below does the right thing. */
ctx->base.pc_next += 4;
return true;
}
static void riscv_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
{
DisasContext *ctx = container_of(dcbase, DisasContext, base);
CPURISCVState *env = cpu->env_ptr;
ctx->opcode = cpu_ldl_code(env, ctx->base.pc_next);
decode_opc(env, ctx);
ctx->base.pc_next = ctx->pc_succ_insn;
if (ctx->base.is_jmp == DISAS_NEXT) {
target_ulong page_start;
page_start = ctx->base.pc_first & TARGET_PAGE_MASK;
if (ctx->base.pc_next - page_start >= TARGET_PAGE_SIZE) {
ctx->base.is_jmp = DISAS_TOO_MANY;
}
}
}
static void riscv_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
{
DisasContext *ctx = container_of(dcbase, DisasContext, base);
switch (ctx->base.is_jmp) {
case DISAS_TOO_MANY:
gen_goto_tb(ctx, 0, ctx->base.pc_next);
break;
case DISAS_NORETURN:
break;
default:
g_assert_not_reached();
}
}
static void riscv_tr_disas_log(const DisasContextBase *dcbase, CPUState *cpu)
{
qemu_log("IN: %s\n", lookup_symbol(dcbase->pc_first));
log_target_disas(cpu, dcbase->pc_first, dcbase->tb->size);
}
static const TranslatorOps riscv_tr_ops = {
.init_disas_context = riscv_tr_init_disas_context,
.tb_start = riscv_tr_tb_start,
.insn_start = riscv_tr_insn_start,
.breakpoint_check = riscv_tr_breakpoint_check,
.translate_insn = riscv_tr_translate_insn,
.tb_stop = riscv_tr_tb_stop,
.disas_log = riscv_tr_disas_log,
};
void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
{
DisasContext ctx;
translator_loop(&riscv_tr_ops, &ctx.base, cs, tb);
}
void riscv_translate_init(void)
{
int i;
/* cpu_gpr[0] is a placeholder for the zero register. Do not use it. */
/* Use the gen_set_gpr and gen_get_gpr helper functions when accessing */
/* registers, unless you specifically block reads/writes to reg 0 */
cpu_gpr[0] = NULL;
for (i = 1; i < 32; i++) {
cpu_gpr[i] = tcg_global_mem_new(cpu_env,
offsetof(CPURISCVState, gpr[i]), riscv_int_regnames[i]);
}
for (i = 0; i < 32; i++) {
cpu_fpr[i] = tcg_global_mem_new_i64(cpu_env,
offsetof(CPURISCVState, fpr[i]), riscv_fpr_regnames[i]);
}
cpu_pc = tcg_global_mem_new(cpu_env, offsetof(CPURISCVState, pc), "pc");
load_res = tcg_global_mem_new(cpu_env, offsetof(CPURISCVState, load_res),
"load_res");
load_val = tcg_global_mem_new(cpu_env, offsetof(CPURISCVState, load_val),
"load_val");
}
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