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emitter.c
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emitter.c
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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
* Copyright (C) 2014-2021 Paul Cercueil <paul@crapouillou.net>
*/
#include "arch.h"
#include "blockcache.h"
#include "debug.h"
#include "disassembler.h"
#include "emitter.h"
#include "lightning-wrapper.h"
#include "optimizer.h"
#include "regcache.h"
#include <stdbool.h>
#include <stddef.h>
#define LIGHTNING_UNALIGNED_32BIT 4
typedef void (*lightrec_rec_func_t)(struct lightrec_cstate *, const struct block *, u16);
/* Forward declarations */
static void rec_SPECIAL(struct lightrec_cstate *state, const struct block *block, u16 offset);
static void rec_REGIMM(struct lightrec_cstate *state, const struct block *block, u16 offset);
static void rec_CP0(struct lightrec_cstate *state, const struct block *block, u16 offset);
static void rec_CP2(struct lightrec_cstate *state, const struct block *block, u16 offset);
static void rec_META(struct lightrec_cstate *state, const struct block *block, u16 offset);
static void rec_cp2_do_mtc2(struct lightrec_cstate *state,
const struct block *block, u16 offset, u8 reg, u8 in_reg);
static void rec_cp2_do_mfc2(struct lightrec_cstate *state,
const struct block *block, u16 offset,
u8 reg, u8 out_reg);
static void
lightrec_jump_to_fn(jit_state_t *_jit, void (*fn)(void))
{
/* Prevent jit_jmpi() from using our cycles register as a temporary */
jit_live(LIGHTREC_REG_CYCLE);
jit_patch_abs(jit_jmpi(), fn);
}
static void
lightrec_jump_to_eob(struct lightrec_cstate *state, jit_state_t *_jit)
{
lightrec_jump_to_fn(_jit, state->state->eob_wrapper_func);
}
static void
lightrec_jump_to_ds_check(struct lightrec_cstate *state, jit_state_t *_jit)
{
lightrec_jump_to_fn(_jit, state->state->ds_check_func);
}
static void update_ra_register(struct regcache *reg_cache, jit_state_t *_jit,
u8 ra_reg, u32 pc, u32 link)
{
u8 link_reg;
link_reg = lightrec_alloc_reg_out(reg_cache, _jit, ra_reg, 0);
lightrec_load_imm(reg_cache, _jit, link_reg, pc, link);
lightrec_free_reg(reg_cache, link_reg);
}
static void lightrec_emit_end_of_block(struct lightrec_cstate *state,
const struct block *block, u16 offset,
s8 reg_new_pc, u32 imm, u8 ra_reg,
u32 link, bool update_cycles)
{
struct regcache *reg_cache = state->reg_cache;
jit_state_t *_jit = block->_jit;
const struct opcode *op = &block->opcode_list[offset],
*ds = get_delay_slot(block->opcode_list, offset);
u32 cycles = state->cycles + lightrec_cycles_of_opcode(state->state, op->c);
bool has_ds = has_delay_slot(op->c);
jit_note(__FILE__, __LINE__);
if (link && ra_reg != reg_new_pc)
update_ra_register(reg_cache, _jit, ra_reg, block->pc, link);
if (reg_new_pc < 0)
lightrec_load_next_pc_imm(reg_cache, _jit, block->pc, imm);
else
lightrec_load_next_pc(reg_cache, _jit, reg_new_pc);
if (link && ra_reg == reg_new_pc) {
/* Handle the special case: JALR $r0, $r0
* In that case the target PC should be the old value of the
* register. */
update_ra_register(reg_cache, _jit, ra_reg, block->pc, link);
}
if (has_ds && !op_flag_no_ds(op->flags) && !op_flag_local_branch(op->flags)) {
cycles += lightrec_cycles_of_opcode(state->state, ds->c);
/* Recompile the delay slot */
if (ds->c.opcode)
lightrec_rec_opcode(state, block, offset + 1);
}
/* Clean the remaining registers */
lightrec_clean_regs(reg_cache, _jit);
if (cycles && update_cycles) {
jit_subi(LIGHTREC_REG_CYCLE, LIGHTREC_REG_CYCLE, cycles);
pr_debug("EOB: %"PRIu32" cycles\n", cycles);
}
if (has_ds && op_flag_load_delay(ds->flags)
&& opcode_has_load_delay(ds->c) && !state->no_load_delay) {
/* If the delay slot is a load opcode, its target register
* will be written after the first opcode of the target is
* executed. Handle this by jumping to a special section of
* the dispatcher. It expects the loaded value to be in
* REG_TEMP, and the target register number to be in JIT_V1.*/
jit_movi(JIT_V1, ds->c.i.rt);
lightrec_jump_to_ds_check(state, _jit);
} else {
lightrec_jump_to_eob(state, _jit);
}
lightrec_regcache_reset(reg_cache);
}
void lightrec_emit_jump_to_interpreter(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
struct regcache *reg_cache = state->reg_cache;
jit_state_t *_jit = block->_jit;
lightrec_clean_regs(reg_cache, _jit);
/* Call the interpreter with the block's address in JIT_V1 and the
* PC (which might have an offset) in JIT_V0. */
lightrec_load_imm(reg_cache, _jit, JIT_V0, block->pc,
block->pc + (offset << 2));
if (lightrec_store_next_pc()) {
jit_stxi_i(lightrec_offset(next_pc), LIGHTREC_REG_STATE, JIT_V0);
}
jit_movi(JIT_V1, (uintptr_t)block);
jit_subi(LIGHTREC_REG_CYCLE, LIGHTREC_REG_CYCLE, state->cycles);
lightrec_jump_to_fn(_jit, state->state->interpreter_func);
}
static void lightrec_emit_eob(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
struct regcache *reg_cache = state->reg_cache;
jit_state_t *_jit = block->_jit;
lightrec_clean_regs(reg_cache, _jit);
lightrec_load_imm(reg_cache, _jit, JIT_V0, block->pc,
block->pc + (offset << 2));
if (lightrec_store_next_pc()) {
jit_stxi_i(lightrec_offset(next_pc), LIGHTREC_REG_STATE, JIT_V0);
}
jit_subi(LIGHTREC_REG_CYCLE, LIGHTREC_REG_CYCLE, state->cycles);
lightrec_jump_to_eob(state, _jit);
}
static void rec_special_JR(struct lightrec_cstate *state, const struct block *block, u16 offset)
{
union code c = block->opcode_list[offset].c;
_jit_name(block->_jit, __func__);
lightrec_emit_end_of_block(state, block, offset, c.r.rs, 0, 31, 0, true);
}
static void rec_special_JALR(struct lightrec_cstate *state, const struct block *block, u16 offset)
{
union code c = block->opcode_list[offset].c;
_jit_name(block->_jit, __func__);
lightrec_emit_end_of_block(state, block, offset, c.r.rs, 0, c.r.rd,
get_branch_pc(block, offset, 2), true);
}
static void rec_J(struct lightrec_cstate *state, const struct block *block, u16 offset)
{
union code c = block->opcode_list[offset].c;
_jit_name(block->_jit, __func__);
lightrec_emit_end_of_block(state, block, offset, -1,
(block->pc & 0xf0000000) | (c.j.imm << 2),
31, 0, true);
}
static void rec_JAL(struct lightrec_cstate *state, const struct block *block, u16 offset)
{
union code c = block->opcode_list[offset].c;
_jit_name(block->_jit, __func__);
lightrec_emit_end_of_block(state, block, offset, -1,
(block->pc & 0xf0000000) | (c.j.imm << 2),
31, get_branch_pc(block, offset, 2), true);
}
static void lightrec_do_early_unload(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
struct regcache *reg_cache = state->reg_cache;
const struct opcode *op = &block->opcode_list[offset];
jit_state_t *_jit = block->_jit;
unsigned int i;
u8 reg;
struct {
u8 reg, op;
} reg_ops[3] = {
{ op->r.rd, LIGHTREC_FLAGS_GET_RD(op->flags), },
{ op->i.rt, LIGHTREC_FLAGS_GET_RT(op->flags), },
{ op->i.rs, LIGHTREC_FLAGS_GET_RS(op->flags), },
};
for (i = 0; i < ARRAY_SIZE(reg_ops); i++) {
reg = reg_ops[i].reg;
switch (reg_ops[i].op) {
case LIGHTREC_REG_UNLOAD:
lightrec_clean_reg_if_loaded(reg_cache, _jit, reg, true);
break;
case LIGHTREC_REG_DISCARD:
lightrec_discard_reg_if_loaded(reg_cache, reg);
break;
case LIGHTREC_REG_CLEAN:
lightrec_clean_reg_if_loaded(reg_cache, _jit, reg, false);
break;
default:
break;
};
}
}
static void rec_b(struct lightrec_cstate *state, const struct block *block, u16 offset,
jit_code_t code, jit_code_t code2, u32 link, bool unconditional, bool bz)
{
struct regcache *reg_cache = state->reg_cache;
struct native_register *regs_backup;
jit_state_t *_jit = block->_jit;
struct lightrec_branch *branch;
const struct opcode *op = &block->opcode_list[offset],
*ds = get_delay_slot(block->opcode_list, offset);
bool is_forward = (s16)op->i.imm >= 0;
int op_cycles = lightrec_cycles_of_opcode(state->state, op->c);
u32 target_offset, cycles = state->cycles + op_cycles;
bool no_indirection = false;
jit_node_t *addr = NULL;
u32 next_pc;
u8 rs, rt;
jit_note(__FILE__, __LINE__);
if (!op_flag_no_ds(op->flags))
cycles += lightrec_cycles_of_opcode(state->state, ds->c);
state->cycles = -op_cycles;
if (!unconditional) {
rs = lightrec_alloc_reg_in(reg_cache, _jit, op->i.rs, REG_EXT);
rt = bz ? 0 : lightrec_alloc_reg_in(reg_cache,
_jit, op->i.rt, REG_EXT);
/* Unload dead registers before evaluating the branch */
if (OPT_EARLY_UNLOAD)
lightrec_do_early_unload(state, block, offset);
if (op_flag_local_branch(op->flags) &&
(op_flag_no_ds(op->flags) || !ds->opcode) &&
is_forward && !lightrec_has_dirty_regs(reg_cache))
no_indirection = true;
if (no_indirection)
pr_debug("Using no indirection for branch at offset 0x%hx\n", offset << 2);
}
if (cycles)
jit_subi(LIGHTREC_REG_CYCLE, LIGHTREC_REG_CYCLE, cycles);
if (!unconditional) {
/* Generate the branch opcode */
if (!no_indirection)
addr = jit_new_node_pww(code, NULL, rs, rt);
lightrec_free_regs(reg_cache);
regs_backup = lightrec_regcache_enter_branch(reg_cache);
}
if (op_flag_local_branch(op->flags)) {
/* Recompile the delay slot */
if (!op_flag_no_ds(op->flags) && ds->opcode) {
/* Never handle load delays with local branches. */
state->no_load_delay = true;
lightrec_rec_opcode(state, block, offset + 1);
}
if (link)
update_ra_register(reg_cache, _jit, 31, block->pc, link);
/* Clean remaining registers */
lightrec_clean_regs(reg_cache, _jit);
target_offset = offset + 1 + (s16)op->i.imm
- !!op_flag_no_ds(op->flags);
pr_debug("Adding local branch to offset 0x%"PRIx32"\n",
target_offset << 2);
branch = &state->local_branches[
state->nb_local_branches++];
branch->target = target_offset;
if (no_indirection)
branch->branch = jit_new_node_pww(code2, NULL, rs, rt);
else if (is_forward)
branch->branch = jit_b();
else
branch->branch = jit_bgti(LIGHTREC_REG_CYCLE, 0);
}
if (!op_flag_local_branch(op->flags) || !is_forward) {
next_pc = get_branch_pc(block, offset, 1 + (s16)op->i.imm);
state->no_load_delay = op_flag_local_branch(op->flags);
lightrec_emit_end_of_block(state, block, offset, -1, next_pc,
31, link, false);
}
if (!unconditional) {
if (!no_indirection)
jit_patch(addr);
lightrec_regcache_leave_branch(reg_cache, regs_backup);
if (bz && link)
update_ra_register(reg_cache, _jit, 31, block->pc, link);
if (!op_flag_no_ds(op->flags) && ds->opcode) {
state->no_load_delay = true;
lightrec_rec_opcode(state, block, offset + 1);
}
}
}
static void rec_BNE(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
union code c = block->opcode_list[offset].c;
_jit_name(block->_jit, __func__);
if (c.i.rt == 0)
rec_b(state, block, offset, jit_code_beqi, jit_code_bnei, 0, false, true);
else
rec_b(state, block, offset, jit_code_beqr, jit_code_bner, 0, false, false);
}
static void rec_BEQ(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
union code c = block->opcode_list[offset].c;
_jit_name(block->_jit, __func__);
if (c.i.rt == 0)
rec_b(state, block, offset, jit_code_bnei, jit_code_beqi, 0, c.i.rs == 0, true);
else
rec_b(state, block, offset, jit_code_bner, jit_code_beqr, 0, c.i.rs == c.i.rt, false);
}
static void rec_BLEZ(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
union code c = block->opcode_list[offset].c;
_jit_name(block->_jit, __func__);
rec_b(state, block, offset, jit_code_bgti, jit_code_blei, 0, c.i.rs == 0, true);
}
static void rec_BGTZ(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_b(state, block, offset, jit_code_blei, jit_code_bgti, 0, false, true);
}
static void rec_regimm_BLTZ(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_b(state, block, offset, jit_code_bgei, jit_code_blti, 0, false, true);
}
static void rec_regimm_BLTZAL(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_b(state, block, offset, jit_code_bgei, jit_code_blti,
get_branch_pc(block, offset, 2), false, true);
}
static void rec_regimm_BGEZ(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
union code c = block->opcode_list[offset].c;
_jit_name(block->_jit, __func__);
rec_b(state, block, offset, jit_code_blti, jit_code_bgei, 0, !c.i.rs, true);
}
static void rec_regimm_BGEZAL(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
const struct opcode *op = &block->opcode_list[offset];
_jit_name(block->_jit, __func__);
rec_b(state, block, offset, jit_code_blti, jit_code_bgei,
get_branch_pc(block, offset, 2),
!op->i.rs, true);
}
static void rec_alloc_rs_rd(struct regcache *reg_cache,
jit_state_t *_jit,
const struct opcode *op,
u8 rs, u8 rd,
u8 in_flags, u8 out_flags,
u8 *rs_out, u8 *rd_out)
{
bool unload, discard;
u32 unload_flags;
if (OPT_EARLY_UNLOAD) {
unload_flags = LIGHTREC_FLAGS_GET_RS(op->flags);
unload = unload_flags == LIGHTREC_REG_UNLOAD;
discard = unload_flags == LIGHTREC_REG_DISCARD;
}
if (OPT_EARLY_UNLOAD && rs && rd != rs && (unload || discard)) {
rs = lightrec_alloc_reg_in(reg_cache, _jit, rs, in_flags);
lightrec_remap_reg(reg_cache, _jit, rs, rd, discard);
lightrec_set_reg_out_flags(reg_cache, rs, out_flags);
rd = rs;
} else {
rs = lightrec_alloc_reg_in(reg_cache, _jit, rs, in_flags);
rd = lightrec_alloc_reg_out(reg_cache, _jit, rd, out_flags);
}
*rs_out = rs;
*rd_out = rd;
}
static void rec_alu_imm(struct lightrec_cstate *state, const struct block *block,
u16 offset, jit_code_t code, bool slti)
{
struct regcache *reg_cache = state->reg_cache;
union code c = block->opcode_list[offset].c;
jit_state_t *_jit = block->_jit;
u8 rs, rt, out_flags = REG_EXT;
if (slti)
out_flags |= REG_ZEXT;
jit_note(__FILE__, __LINE__);
rec_alloc_rs_rd(reg_cache, _jit, &block->opcode_list[offset],
c.i.rs, c.i.rt, REG_EXT, out_flags, &rs, &rt);
jit_new_node_www(code, rt, rs, (s32)(s16) c.i.imm);
lightrec_free_reg(reg_cache, rs);
lightrec_free_reg(reg_cache, rt);
}
static void rec_alu_special(struct lightrec_cstate *state, const struct block *block,
u16 offset, jit_code_t code, bool out_ext)
{
struct regcache *reg_cache = state->reg_cache;
union code c = block->opcode_list[offset].c;
jit_state_t *_jit = block->_jit;
u8 rd, rt, rs;
jit_note(__FILE__, __LINE__);
rt = lightrec_alloc_reg_in(reg_cache, _jit, c.r.rt, REG_EXT);
rec_alloc_rs_rd(reg_cache, _jit, &block->opcode_list[offset],
c.r.rs, c.r.rd, REG_EXT,
out_ext ? REG_EXT | REG_ZEXT : 0, &rs, &rd);
jit_new_node_www(code, rd, rs, rt);
lightrec_free_reg(reg_cache, rs);
lightrec_free_reg(reg_cache, rt);
lightrec_free_reg(reg_cache, rd);
}
static void rec_alu_shiftv(struct lightrec_cstate *state, const struct block *block,
u16 offset, jit_code_t code)
{
struct regcache *reg_cache = state->reg_cache;
union code c = block->opcode_list[offset].c;
jit_state_t *_jit = block->_jit;
u8 rd, rt, rs, temp, flags = 0;
jit_note(__FILE__, __LINE__);
if (code == jit_code_rshr)
flags = REG_EXT;
else if (code == jit_code_rshr_u)
flags = REG_ZEXT;
rs = lightrec_alloc_reg_in(reg_cache, _jit, c.r.rs, 0);
rec_alloc_rs_rd(reg_cache, _jit, &block->opcode_list[offset],
c.r.rt, c.r.rd, flags, flags, &rt, &rd);
if (rt != rd) {
jit_andi(rd, rs, 0x1f);
jit_new_node_www(code, rd, rt, rd);
} else {
temp = lightrec_alloc_reg_temp(reg_cache, _jit);
jit_andi(temp, rs, 0x1f);
jit_new_node_www(code, rd, rt, temp);
lightrec_free_reg(reg_cache, temp);
}
lightrec_free_reg(reg_cache, rs);
lightrec_free_reg(reg_cache, rt);
lightrec_free_reg(reg_cache, rd);
}
static void rec_movi(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
struct regcache *reg_cache = state->reg_cache;
union code c = block->opcode_list[offset].c;
jit_state_t *_jit = block->_jit;
u16 flags = REG_EXT;
s32 value = (s32)(s16) c.i.imm;
u8 rt;
if (block->opcode_list[offset].flags & LIGHTREC_MOVI)
value += (s32)((u32)state->movi_temp[c.i.rt] << 16);
if (value >= 0)
flags |= REG_ZEXT;
rt = lightrec_alloc_reg_out(reg_cache, _jit, c.i.rt, flags);
jit_movi(rt, value);
lightrec_free_reg(reg_cache, rt);
}
static void rec_ADDIU(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
const struct opcode *op = &block->opcode_list[offset];
_jit_name(block->_jit, __func__);
if (op->i.rs && !(op->flags & LIGHTREC_MOVI))
rec_alu_imm(state, block, offset, jit_code_addi, false);
else
rec_movi(state, block, offset);
}
static void rec_ADDI(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
/* TODO: Handle the exception? */
_jit_name(block->_jit, __func__);
rec_ADDIU(state, block, offset);
}
static void rec_SLTIU(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_alu_imm(state, block, offset, jit_code_lti_u, true);
}
static void rec_SLTI(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_alu_imm(state, block, offset, jit_code_lti, true);
}
static void rec_ANDI(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
struct regcache *reg_cache = state->reg_cache;
union code c = block->opcode_list[offset].c;
jit_state_t *_jit = block->_jit;
u8 rs, rt;
_jit_name(block->_jit, __func__);
jit_note(__FILE__, __LINE__);
rec_alloc_rs_rd(reg_cache, _jit, &block->opcode_list[offset],
c.i.rs, c.i.rt, 0, REG_EXT | REG_ZEXT, &rs, &rt);
/* PSX code uses ANDI 0xff / ANDI 0xffff a lot, which are basically
* casts to uint8_t / uint16_t. */
if (c.i.imm == 0xff)
jit_extr_uc(rt, rs);
else if (c.i.imm == 0xffff)
jit_extr_us(rt, rs);
else
jit_andi(rt, rs, (u32)(u16) c.i.imm);
lightrec_free_reg(reg_cache, rs);
lightrec_free_reg(reg_cache, rt);
}
static void rec_alu_or_xor(struct lightrec_cstate *state, const struct block *block,
u16 offset, jit_code_t code)
{
struct regcache *reg_cache = state->reg_cache;
union code c = block->opcode_list[offset].c;
jit_state_t *_jit = block->_jit;
u8 rs, rt, flags;
jit_note(__FILE__, __LINE__);
rec_alloc_rs_rd(reg_cache, _jit, &block->opcode_list[offset],
c.i.rs, c.i.rt, 0, 0, &rs, &rt);
flags = lightrec_get_reg_in_flags(reg_cache, rs);
lightrec_set_reg_out_flags(reg_cache, rt, flags);
jit_new_node_www(code, rt, rs, (u32)(u16) c.i.imm);
lightrec_free_reg(reg_cache, rs);
lightrec_free_reg(reg_cache, rt);
}
static void rec_ORI(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
const struct opcode *op = &block->opcode_list[offset];
struct regcache *reg_cache = state->reg_cache;
jit_state_t *_jit = block->_jit;
s32 val;
u8 rt;
_jit_name(_jit, __func__);
if (op->flags & LIGHTREC_MOVI) {
rt = lightrec_alloc_reg_out(reg_cache, _jit, op->i.rt, REG_EXT);
val = ((u32)state->movi_temp[op->i.rt] << 16) | op->i.imm;
jit_movi(rt, val);
lightrec_free_reg(reg_cache, rt);
} else {
rec_alu_or_xor(state, block, offset, jit_code_ori);
}
}
static void rec_XORI(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_alu_or_xor(state, block, offset, jit_code_xori);
}
static void rec_LUI(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
struct regcache *reg_cache = state->reg_cache;
union code c = block->opcode_list[offset].c;
jit_state_t *_jit = block->_jit;
u8 rt, flags = REG_EXT;
if (block->opcode_list[offset].flags & LIGHTREC_MOVI) {
state->movi_temp[c.i.rt] = c.i.imm;
return;
}
jit_name(__func__);
jit_note(__FILE__, __LINE__);
if (!(c.i.imm & BIT(15)))
flags |= REG_ZEXT;
rt = lightrec_alloc_reg_out(reg_cache, _jit, c.i.rt, flags);
jit_movi(rt, (s32)(c.i.imm << 16));
lightrec_free_reg(reg_cache, rt);
}
static void rec_special_ADDU(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_alu_special(state, block, offset, jit_code_addr, false);
}
static void rec_special_ADD(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
/* TODO: Handle the exception? */
_jit_name(block->_jit, __func__);
rec_alu_special(state, block, offset, jit_code_addr, false);
}
static void rec_special_SUBU(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_alu_special(state, block, offset, jit_code_subr, false);
}
static void rec_special_SUB(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
/* TODO: Handle the exception? */
_jit_name(block->_jit, __func__);
rec_alu_special(state, block, offset, jit_code_subr, false);
}
static void rec_special_AND(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
struct regcache *reg_cache = state->reg_cache;
union code c = block->opcode_list[offset].c;
jit_state_t *_jit = block->_jit;
u8 rd, rt, rs, flags_rs, flags_rt, flags_rd;
_jit_name(block->_jit, __func__);
jit_note(__FILE__, __LINE__);
rt = lightrec_alloc_reg_in(reg_cache, _jit, c.r.rt, 0);
rec_alloc_rs_rd(reg_cache, _jit, &block->opcode_list[offset],
c.r.rs, c.r.rd, 0, 0, &rs, &rd);
flags_rs = lightrec_get_reg_in_flags(reg_cache, rs);
flags_rt = lightrec_get_reg_in_flags(reg_cache, rt);
/* Z(rd) = Z(rs) | Z(rt) */
flags_rd = REG_ZEXT & (flags_rs | flags_rt);
/* E(rd) = (E(rt) & Z(rt)) | (E(rs) & Z(rs)) | (E(rs) & E(rt)) */
if (((flags_rs & REG_EXT) && (flags_rt & REG_ZEXT)) ||
((flags_rt & REG_EXT) && (flags_rs & REG_ZEXT)) ||
(REG_EXT & flags_rs & flags_rt))
flags_rd |= REG_EXT;
lightrec_set_reg_out_flags(reg_cache, rd, flags_rd);
jit_andr(rd, rs, rt);
lightrec_free_reg(reg_cache, rs);
lightrec_free_reg(reg_cache, rt);
lightrec_free_reg(reg_cache, rd);
}
static void rec_special_or_nor(struct lightrec_cstate *state,
const struct block *block, u16 offset, bool nor)
{
struct regcache *reg_cache = state->reg_cache;
union code c = block->opcode_list[offset].c;
jit_state_t *_jit = block->_jit;
u8 rd, rt, rs, flags_rs, flags_rt, flags_rd = 0;
jit_note(__FILE__, __LINE__);
rt = lightrec_alloc_reg_in(reg_cache, _jit, c.r.rt, 0);
rec_alloc_rs_rd(reg_cache, _jit, &block->opcode_list[offset],
c.r.rs, c.r.rd, 0, 0, &rs, &rd);
flags_rs = lightrec_get_reg_in_flags(reg_cache, rs);
flags_rt = lightrec_get_reg_in_flags(reg_cache, rt);
/* or: Z(rd) = Z(rs) & Z(rt)
* nor: Z(rd) = 0 */
if (!nor)
flags_rd = REG_ZEXT & flags_rs & flags_rt;
/* E(rd) = E(rs) & E(rt) */
if (REG_EXT & flags_rs & flags_rt)
flags_rd |= REG_EXT;
lightrec_set_reg_out_flags(reg_cache, rd, flags_rd);
jit_orr(rd, rs, rt);
if (nor)
jit_comr(rd, rd);
lightrec_free_reg(reg_cache, rs);
lightrec_free_reg(reg_cache, rt);
lightrec_free_reg(reg_cache, rd);
}
static void rec_special_OR(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_special_or_nor(state, block, offset, false);
}
static void rec_special_NOR(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_special_or_nor(state, block, offset, true);
}
static void rec_special_XOR(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
struct regcache *reg_cache = state->reg_cache;
union code c = block->opcode_list[offset].c;
jit_state_t *_jit = block->_jit;
u8 rd, rt, rs, flags_rs, flags_rt, flags_rd;
_jit_name(block->_jit, __func__);
jit_note(__FILE__, __LINE__);
rt = lightrec_alloc_reg_in(reg_cache, _jit, c.r.rt, 0);
rec_alloc_rs_rd(reg_cache, _jit, &block->opcode_list[offset],
c.r.rs, c.r.rd, 0, 0, &rs, &rd);
flags_rs = lightrec_get_reg_in_flags(reg_cache, rs);
flags_rt = lightrec_get_reg_in_flags(reg_cache, rt);
/* Z(rd) = Z(rs) & Z(rt) */
flags_rd = REG_ZEXT & flags_rs & flags_rt;
/* E(rd) = E(rs) & E(rt) */
flags_rd |= REG_EXT & flags_rs & flags_rt;
lightrec_set_reg_out_flags(reg_cache, rd, flags_rd);
jit_xorr(rd, rs, rt);
lightrec_free_reg(reg_cache, rs);
lightrec_free_reg(reg_cache, rt);
lightrec_free_reg(reg_cache, rd);
}
static void rec_special_SLTU(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_alu_special(state, block, offset, jit_code_ltr_u, true);
}
static void rec_special_SLT(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_alu_special(state, block, offset, jit_code_ltr, true);
}
static void rec_special_SLLV(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_alu_shiftv(state, block, offset, jit_code_lshr);
}
static void rec_special_SRLV(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_alu_shiftv(state, block, offset, jit_code_rshr_u);
}
static void rec_special_SRAV(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_alu_shiftv(state, block, offset, jit_code_rshr);
}
static void rec_alu_shift(struct lightrec_cstate *state, const struct block *block,
u16 offset, jit_code_t code)
{
struct regcache *reg_cache = state->reg_cache;
union code c = block->opcode_list[offset].c;
jit_state_t *_jit = block->_jit;
u8 rd, rt, flags = 0, out_flags = 0;
jit_note(__FILE__, __LINE__);
if (code == jit_code_rshi)
flags = REG_EXT;
else if (code == jit_code_rshi_u)
flags = REG_ZEXT;
/* Input reg is zero-extended, if we SRL at least by one bit, we know
* the output reg will be both zero-extended and sign-extended. */
out_flags = flags;
if (code == jit_code_rshi_u && c.r.imm)
out_flags |= REG_EXT;
rec_alloc_rs_rd(reg_cache, _jit, &block->opcode_list[offset],
c.r.rt, c.r.rd, flags, out_flags, &rt, &rd);
jit_new_node_www(code, rd, rt, c.r.imm);
lightrec_free_reg(reg_cache, rt);
lightrec_free_reg(reg_cache, rd);
}
static void rec_special_SLL(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_alu_shift(state, block, offset, jit_code_lshi);
}
static void rec_special_SRL(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_alu_shift(state, block, offset, jit_code_rshi_u);
}
static void rec_special_SRA(struct lightrec_cstate *state,
const struct block *block, u16 offset)
{
_jit_name(block->_jit, __func__);
rec_alu_shift(state, block, offset, jit_code_rshi);
}
static void rec_alu_mult(struct lightrec_cstate *state,
const struct block *block, u16 offset, bool is_signed)
{
struct regcache *reg_cache = state->reg_cache;
union code c = block->opcode_list[offset].c;
u32 flags = block->opcode_list[offset].flags;
u8 reg_lo = get_mult_div_lo(c);
u8 reg_hi = get_mult_div_hi(c);
jit_state_t *_jit = block->_jit;
u8 lo, hi = 0, rs, rt, rflags = 0;
bool no_lo = op_flag_no_lo(flags);
bool no_hi = op_flag_no_hi(flags);
jit_note(__FILE__, __LINE__);
if (is_signed)
rflags = REG_EXT;
else
rflags = REG_ZEXT;
rs = lightrec_alloc_reg_in(reg_cache, _jit, c.r.rs, rflags);
rt = lightrec_alloc_reg_in(reg_cache, _jit, c.r.rt, rflags);
if (!no_lo)
lo = lightrec_alloc_reg_out(reg_cache, _jit, reg_lo, 0);
if (!no_hi)
hi = lightrec_alloc_reg_out(reg_cache, _jit, reg_hi, REG_EXT);
if (__WORDSIZE == 32) {
/* On 32-bit systems, do a 32*32->64 bit operation, or a 32*32->32 bit
* operation if the MULT was detected a 32-bit only. */
if (no_lo) {
if (is_signed)
jit_hmulr(hi, rs, rt);
else
jit_hmulr_u(hi, rs, rt);
} else if (no_hi) {
jit_mulr(lo, rs, rt);
} else if (is_signed) {
jit_qmulr(lo, hi, rs, rt);
} else {
jit_qmulr_u(lo, hi, rs, rt);
}
} else {
/* On 64-bit systems, do a 64*64->64 bit operation. */
if (no_lo) {
jit_mulr(hi, rs, rt);
jit_rshi(hi, hi, 32);
} else {
jit_mulr(lo, rs, rt);
/* The 64-bit output value is in $lo, store the upper 32 bits in $hi */
if (!no_hi)
jit_rshi(hi, lo, 32);
}
}
lightrec_free_reg(reg_cache, rs);
lightrec_free_reg(reg_cache, rt);
if (!no_lo)
lightrec_free_reg(reg_cache, lo);
if (!no_hi)
lightrec_free_reg(reg_cache, hi);
}