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translate.c
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translate.c
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/*
* RISC-V emulation for qemu: main translation routines.
*
* Author: Sagar Karandikar, sagark@eecs.berkeley.edu
*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; 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/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;
#ifdef CONFIG_USER_ONLY
static TCGv_i32 cpu_amoinsn;
#endif
#include "exec/gen-icount.h"
typedef struct DisasContext {
struct TranslationBlock *tb;
target_ulong pc;
target_ulong next_pc;
uint32_t opcode;
int singlestep_enabled;
int mem_idx;
int bstate;
} DisasContext;
static inline void kill_unknown(DisasContext *ctx, int excp);
enum {
BS_NONE = 0, /* When seen outside of translation while loop, indicates
need to exit tb due to end of page. */
BS_STOP = 1, /* Need to exit tb for syscall, sret, etc. */
BS_BRANCH = 2, /* Need to exit tb for branch, jal, etc. */
};
/* 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 inline void generate_exception(DisasContext *ctx, int excp)
{
tcg_gen_movi_tl(cpu_pc, ctx->pc);
TCGv_i32 helper_tmp = tcg_const_i32(excp);
gen_helper_raise_exception(cpu_env, helper_tmp);
tcg_temp_free_i32(helper_tmp);
}
static inline void generate_exception_mbadaddr(DisasContext *ctx, int excp)
{
tcg_gen_movi_tl(cpu_pc, ctx->pc);
TCGv_i32 helper_tmp = tcg_const_i32(excp);
gen_helper_raise_exception_mbadaddr(cpu_env, helper_tmp, cpu_pc);
tcg_temp_free_i32(helper_tmp);
}
/* unknown instruction */
static inline void kill_unknown(DisasContext *ctx, int excp)
{
generate_exception(ctx, excp);
ctx->bstate = BS_STOP;
}
static inline bool use_goto_tb(DisasContext *ctx, target_ulong dest)
{
if (unlikely(ctx->singlestep_enabled)) {
return false;
}
#ifndef CONFIG_USER_ONLY
return (ctx->tb->pc & TARGET_PAGE_MASK) == (dest & TARGET_PAGE_MASK);
#else
return true;
#endif
}
static inline 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((uintptr_t)ctx->tb + n);
} else {
tcg_gen_movi_tl(cpu_pc, dest);
if (ctx->singlestep_enabled) {
gen_helper_raise_exception_debug(cpu_env);
}
tcg_gen_exit_tb(0);
}
}
/* 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)
{
TCGv t0 = tcg_temp_new();
#if !defined(CONFIG_USER_ONLY)
TCGLabel *fp_ok = gen_new_label();
TCGLabel *done = gen_new_label();
/* check MSTATUS.FS */
tcg_gen_ld_tl(t0, cpu_env, offsetof(CPURISCVState, mstatus));
tcg_gen_andi_tl(t0, t0, MSTATUS_FS);
tcg_gen_brcondi_tl(TCG_COND_NE, t0, 0x0, fp_ok);
/* MSTATUS_FS field was zero */
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
tcg_gen_br(done);
/* proceed with operation */
gen_set_label(fp_ok);
#endif
TCGv_i64 src1 = tcg_temp_new_i64();
TCGv_i64 src2 = tcg_temp_new_i64();
tcg_gen_mov_i64(src1, cpu_fpr[rs1]);
tcg_gen_mov_i64(src2, cpu_fpr[rs2]);
switch (rm) {
case 0: /* fsgnj */
if (rs1 == rs2) { /* FMOV */
tcg_gen_mov_i64(cpu_fpr[rd], src1);
}
tcg_gen_andi_i64(src1, src1, ~min);
tcg_gen_andi_i64(src2, src2, min);
tcg_gen_or_i64(cpu_fpr[rd], src1, src2);
break;
case 1: /* fsgnjn */
tcg_gen_andi_i64(src1, src1, ~min);
tcg_gen_not_i64(src2, src2);
tcg_gen_andi_i64(src2, src2, min);
tcg_gen_or_i64(cpu_fpr[rd], src1, src2);
break;
case 2: /* fsgnjx */
tcg_gen_andi_i64(src2, src2, min);
tcg_gen_xor_i64(cpu_fpr[rd], src1, src2);
break;
default:
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
}
tcg_temp_free_i64(src1);
tcg_temp_free_i64(src2);
#if !defined(CONFIG_USER_ONLY)
gen_set_label(done);
#endif
tcg_temp_free(t0);
}
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;
/* fall through to SRA */
#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:
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
break;
}
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;
source1 = tcg_temp_new();
gen_get_gpr(source1, rs1);
target_long extra_shamt = 0;
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:
if ((imm >= 32)) {
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
break;
}
/* fall through to SLLI */
#endif
case OPC_RISC_SLLI:
if (imm < TARGET_LONG_BITS) {
tcg_gen_shli_tl(source1, source1, imm);
} else {
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
}
break;
#if defined(TARGET_RISCV64)
case OPC_RISC_SHIFT_RIGHT_IW:
if ((imm & 0x3ff) >= 32) {
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
}
tcg_gen_shli_tl(source1, source1, 32);
extra_shamt = 32;
/* fall through to SHIFT_RIGHT_I */
#endif
case OPC_RISC_SHIFT_RIGHT_I:
/* differentiate on IMM */
if ((imm & 0x3ff) < TARGET_LONG_BITS) {
if (imm & 0x400) {
/* SRAI[W] */
tcg_gen_sari_tl(source1, source1, (imm ^ 0x400) + extra_shamt);
} else {
/* SRLI[W] */
tcg_gen_shri_tl(source1, source1, imm + extra_shamt);
}
} else {
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
}
break;
default:
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
break;
}
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->pc + imm;
if (!riscv_has_ext(env, RVC)) {
if ((next_pc & 0x3) != 0) {
generate_exception_mbadaddr(ctx, RISCV_EXCP_INST_ADDR_MIS);
}
}
if (rd != 0) {
tcg_gen_movi_tl(cpu_gpr[rd], ctx->next_pc);
}
gen_goto_tb(ctx, 0, ctx->pc + imm); /* must use this for safety */
ctx->bstate = BS_BRANCH;
}
static void gen_jalr(CPURISCVState *env, DisasContext *ctx, uint32_t opc,
int rd, int rs1, target_long imm)
{
/* no chaining with JALR */
TCGLabel *misaligned = gen_new_label();
TCGv t0;
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)) {
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->next_pc);
}
tcg_gen_exit_tb(0);
gen_set_label(misaligned);
generate_exception_mbadaddr(ctx, RISCV_EXCP_INST_ADDR_MIS);
tcg_gen_exit_tb(0);
ctx->bstate = BS_BRANCH;
break;
default:
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
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:
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
break;
}
gen_goto_tb(ctx, 1, ctx->next_pc);
gen_set_label(l); /* branch taken */
if (!riscv_has_ext(env, RVC) && ((ctx->pc + bimm) & 0x3)) {
/* misaligned */
generate_exception_mbadaddr(ctx, RISCV_EXCP_INST_ADDR_MIS);
tcg_gen_exit_tb(0);
} else {
gen_goto_tb(ctx, 0, ctx->pc + bimm);
}
tcg_temp_free(source1);
tcg_temp_free(source2);
ctx->bstate = BS_BRANCH;
}
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) {
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
} else {
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) {
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
} else {
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 = tcg_temp_new();
#if !defined(CONFIG_USER_ONLY)
TCGLabel *fp_ok = gen_new_label();
TCGLabel *done = gen_new_label();
/* check MSTATUS.FS */
tcg_gen_ld_tl(t0, cpu_env, offsetof(CPURISCVState, mstatus));
tcg_gen_andi_tl(t0, t0, MSTATUS_FS);
tcg_gen_brcondi_tl(TCG_COND_NE, t0, 0x0, fp_ok);
/* MSTATUS_FS field was zero */
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
tcg_gen_br(done);
/* proceed with operation */
gen_set_label(fp_ok);
#endif
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);
break;
case OPC_RISC_FLD:
tcg_gen_qemu_ld_i64(cpu_fpr[rd], t0, ctx->mem_idx, MO_TEQ);
break;
default:
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
break;
}
#if !defined(CONFIG_USER_ONLY)
gen_set_label(done);
#endif
tcg_temp_free(t0);
}
static void gen_fp_store(DisasContext *ctx, uint32_t opc, int rs1,
int rs2, target_long imm)
{
TCGv t0 = tcg_temp_new();
TCGv t1 = tcg_temp_new();
#if !defined(CONFIG_USER_ONLY)
TCGLabel *fp_ok = gen_new_label();
TCGLabel *done = gen_new_label();
/* check MSTATUS.FS */
tcg_gen_ld_tl(t0, cpu_env, offsetof(CPURISCVState, mstatus));
tcg_gen_andi_tl(t0, t0, MSTATUS_FS);
tcg_gen_brcondi_tl(TCG_COND_NE, t0, 0x0, fp_ok);
/* MSTATUS_FS field was zero */
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
tcg_gen_br(done);
/* proceed with operation */
gen_set_label(fp_ok);
#endif
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:
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
break;
}
#if !defined(CONFIG_USER_ONLY)
gen_set_label(done);
#endif
tcg_temp_free(t0);
tcg_temp_free(t1);
}
static void gen_atomic(DisasContext *ctx, uint32_t opc,
int rd, int rs1, int rs2)
{
#if !defined(CONFIG_USER_ONLY)
/* TODO: handle aq, rl bits? - for now just get rid of them: */
opc = MASK_OP_ATOMIC_NO_AQ_RL(opc);
TCGv source1, source2, dat;
TCGLabel *j = gen_new_label();
TCGLabel *done = gen_new_label();
source1 = tcg_temp_local_new();
source2 = tcg_temp_local_new();
dat = tcg_temp_local_new();
gen_get_gpr(source1, rs1);
gen_get_gpr(source2, rs2);
switch (opc) {
/* all currently implemented as non-atomics */
case OPC_RISC_LR_W:
/* put addr in load_res */
tcg_gen_mov_tl(load_res, source1);
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TESL | MO_ALIGN);
break;
case OPC_RISC_SC_W:
tcg_gen_brcond_tl(TCG_COND_NE, load_res, source1, j);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEUL | MO_ALIGN);
tcg_gen_movi_tl(dat, 0); /*success */
tcg_gen_br(done);
gen_set_label(j);
tcg_gen_movi_tl(dat, 1); /*fail */
gen_set_label(done);
break;
case OPC_RISC_AMOSWAP_W:
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TESL | MO_ALIGN);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEUL | MO_ALIGN);
break;
case OPC_RISC_AMOADD_W:
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TESL | MO_ALIGN);
tcg_gen_add_tl(source2, dat, source2);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEUL | MO_ALIGN);
break;
case OPC_RISC_AMOXOR_W:
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TESL | MO_ALIGN);
tcg_gen_xor_tl(source2, dat, source2);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEUL | MO_ALIGN);
break;
case OPC_RISC_AMOAND_W:
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TESL | MO_ALIGN);
tcg_gen_and_tl(source2, dat, source2);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEUL | MO_ALIGN);
break;
case OPC_RISC_AMOOR_W:
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TESL | MO_ALIGN);
tcg_gen_or_tl(source2, dat, source2);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEUL | MO_ALIGN);
break;
case OPC_RISC_AMOMIN_W:
tcg_gen_ext32s_tl(source2, source2); /* since comparing */
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TESL | MO_ALIGN);
tcg_gen_movcond_tl(TCG_COND_LT, source2, dat, source2, dat, source2);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEUL | MO_ALIGN);
break;
case OPC_RISC_AMOMAX_W:
tcg_gen_ext32s_tl(source2, source2); /* since comparing */
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TESL | MO_ALIGN);
tcg_gen_movcond_tl(TCG_COND_GT, source2, dat, source2, dat, source2);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEUL | MO_ALIGN);
break;
case OPC_RISC_AMOMINU_W:
tcg_gen_ext32u_tl(source2, source2); /* since comparing */
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TEUL | MO_ALIGN);
tcg_gen_movcond_tl(TCG_COND_LTU, source2, dat, source2, dat, source2);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEUL | MO_ALIGN);
tcg_gen_ext32s_tl(dat, dat); /* since load was TEUL */
break;
case OPC_RISC_AMOMAXU_W:
tcg_gen_ext32u_tl(source2, source2); /* since comparing */
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TEUL | MO_ALIGN);
tcg_gen_movcond_tl(TCG_COND_GTU, source2, dat, source2, dat, source2);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEUL | MO_ALIGN);
tcg_gen_ext32s_tl(dat, dat); /* since load was TEUL */
break;
#if defined(TARGET_RISCV64)
case OPC_RISC_LR_D:
/* put addr in load_res */
tcg_gen_mov_tl(load_res, source1);
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
break;
case OPC_RISC_SC_D:
tcg_gen_brcond_tl(TCG_COND_NE, load_res, source1, j);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
tcg_gen_movi_tl(dat, 0); /* success */
tcg_gen_br(done);
gen_set_label(j);
tcg_gen_movi_tl(dat, 1); /* fail */
gen_set_label(done);
break;
case OPC_RISC_AMOSWAP_D:
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
break;
case OPC_RISC_AMOADD_D:
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
tcg_gen_add_tl(source2, dat, source2);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
break;
case OPC_RISC_AMOXOR_D:
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
tcg_gen_xor_tl(source2, dat, source2);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
break;
case OPC_RISC_AMOAND_D:
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
tcg_gen_and_tl(source2, dat, source2);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
break;
case OPC_RISC_AMOOR_D:
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
tcg_gen_or_tl(source2, dat, source2);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
break;
case OPC_RISC_AMOMIN_D:
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
tcg_gen_movcond_tl(TCG_COND_LT, source2, dat, source2, dat, source2);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
break;
case OPC_RISC_AMOMAX_D:
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
tcg_gen_movcond_tl(TCG_COND_GT, source2, dat, source2, dat, source2);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
break;
case OPC_RISC_AMOMINU_D:
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
tcg_gen_movcond_tl(TCG_COND_LTU, source2, dat, source2, dat, source2);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
break;
case OPC_RISC_AMOMAXU_D:
tcg_gen_qemu_ld_tl(dat, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
tcg_gen_movcond_tl(TCG_COND_GTU, source2, dat, source2, dat, source2);
tcg_gen_qemu_st_tl(source2, source1, ctx->mem_idx, MO_TEQ | MO_ALIGN);
break;
#endif
default:
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
break;
}
gen_set_gpr(rd, dat);
tcg_temp_free(source1);
tcg_temp_free(source2);
tcg_temp_free(dat);
#else
tcg_gen_movi_i32(cpu_amoinsn, ctx->opcode);
generate_exception(ctx, QEMU_USER_EXCP_ATOMIC);
#endif
}
static void gen_fp_fmadd(DisasContext *ctx, uint32_t opc, int rd,
int rs1, int rs2, int rs3, int rm)
{
TCGv_i64 rm_reg = tcg_temp_new_i64();
tcg_gen_movi_i64(rm_reg, rm);
switch (opc) {
case OPC_RISC_FMADD_S:
gen_helper_fmadd_s(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2],
cpu_fpr[rs3], rm_reg);
break;
case OPC_RISC_FMADD_D:
gen_helper_fmadd_d(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2],
cpu_fpr[rs3], rm_reg);
break;
default:
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
break;
}
tcg_temp_free_i64(rm_reg);
}
static void gen_fp_fmsub(DisasContext *ctx, uint32_t opc, int rd,
int rs1, int rs2, int rs3, int rm)
{
TCGv_i64 rm_reg = tcg_temp_new_i64();
tcg_gen_movi_i64(rm_reg, rm);
switch (opc) {
case OPC_RISC_FMSUB_S:
gen_helper_fmsub_s(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2],
cpu_fpr[rs3], rm_reg);
break;
case OPC_RISC_FMSUB_D:
gen_helper_fmsub_d(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2],
cpu_fpr[rs3], rm_reg);
break;
default:
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
break;
}
tcg_temp_free_i64(rm_reg);
}
static void gen_fp_fnmsub(DisasContext *ctx, uint32_t opc, int rd,
int rs1, int rs2, int rs3, int rm)
{
TCGv_i64 rm_reg = tcg_temp_new_i64();
tcg_gen_movi_i64(rm_reg, rm);
switch (opc) {
case OPC_RISC_FNMSUB_S:
gen_helper_fnmsub_s(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2],
cpu_fpr[rs3], rm_reg);
break;
case OPC_RISC_FNMSUB_D:
gen_helper_fnmsub_d(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2],
cpu_fpr[rs3], rm_reg);
break;
default:
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
break;
}
tcg_temp_free_i64(rm_reg);
}
static void gen_fp_fnmadd(DisasContext *ctx, uint32_t opc, int rd,
int rs1, int rs2, int rs3, int rm)
{
TCGv_i64 rm_reg = tcg_temp_new_i64();
tcg_gen_movi_i64(rm_reg, rm);
switch (opc) {
case OPC_RISC_FNMADD_S:
gen_helper_fnmadd_s(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2],
cpu_fpr[rs3], rm_reg);
break;
case OPC_RISC_FNMADD_D:
gen_helper_fnmadd_d(cpu_fpr[rd], cpu_env, cpu_fpr[rs1], cpu_fpr[rs2],
cpu_fpr[rs3], rm_reg);
break;
default:
kill_unknown(ctx, RISCV_EXCP_ILLEGAL_INST);
break;
}
tcg_temp_free_i64(rm_reg);
}
static void gen_fp_arith(DisasContext *ctx, uint32_t opc, int rd,
int rs1, int rs2, int rm)
{
TCGv_i64 rm_reg = tcg_temp_new_i64();
TCGv write_int_rd = tcg_temp_new();
tcg_gen_movi_i64(rm_reg, rm);
switch (opc) {