qemu-e2k/target/e2k/translate/state.c

#include "qemu/osdep.h"
#include "qemu.h"
#include "exec/log.h"
#include "translate.h"

TCGv_i64 e2k_get_preg(DisasContext *dc, int reg)
{
    TCGv_i64 ret = e2k_get_temp_i64(dc);
    e2k_gen_preg(ret, reg);
    return ret;
}

TCGv_i64 e2k_gen_preg(TCGv_i64 ret, int reg)
{
    TCGv_i64 tmp = tcg_temp_new_i64();
    assert(reg < 32);
    tcg_gen_shri_i64(tmp, e2k_cs.pregs, reg * 2);
    // TODO: should return preg tag?
    tcg_gen_andi_i64(ret, tmp, 0x01);
    tcg_temp_free_i64(tmp);
    return ret;
}

void e2k_gen_store_preg(int reg, TCGv_i64 val)
{
    TCGv_i64 t0 = tcg_temp_new_i64();
    TCGv_i64 t1 = tcg_temp_new_i64();
    TCGv_i64 t2 = tcg_temp_new_i64();
    tcg_gen_andi_i64(t0, e2k_cs.pregs, ~(3 << (reg * 2)));
    tcg_gen_andi_i64(t1, val, 0x03);
    tcg_gen_shli_i64(t2, t1, reg * 2);
    tcg_gen_or_i64(e2k_cs.pregs, t0, t2);
    tcg_temp_free_i64(t2);
    tcg_temp_free_i64(t1);
    tcg_temp_free_i64(t0);
}

static inline void gen_wreg_offset(TCGv_i32 ret, int reg)
{
    assert(reg < 64);
    // TODO: exception (wsz * 2) <= reg_index

    TCGv_i32 t0 = tcg_temp_new_i32();
    TCGv_i32 t1 = tcg_temp_new_i32();
    TCGv_i32 t2 = tcg_const_i32(WREGS_SIZE);

    tcg_gen_addi_i32(t0, e2k_cs.wbs, reg);     // t = win_start + reg_index
    e2k_gen_wrap_i32(t1, t0, t2);           // t = t % WIN_REGS_COUNT
    tcg_gen_muli_i32(ret, t1, REG_SIZE);    // t = t * REG_SIZE_IN_BYTES

    tcg_temp_free_i32(t2);
    tcg_temp_free_i32(t1);
    tcg_temp_free_i32(t0);
}

static inline void gen_wreg_ptr(TCGv_ptr ret, int reg)
{
    TCGv_i32 t0 = tcg_temp_new_i32();
    TCGv_ptr t1 = tcg_temp_new_ptr();
    gen_wreg_offset(t0, reg);
    tcg_gen_ext_i32_ptr(t1, t0);
    tcg_gen_add_ptr(ret, e2k_cs.win_ptr, t1);
    tcg_temp_free_ptr(t1);
    tcg_temp_free_i32(t0);
}

TCGv_i64 e2k_get_wreg(DisasContext *dc, int reg)
{
    TCGv_i64 ret = e2k_get_temp_i64(dc);
    TCGv_ptr ptr = tcg_temp_new_ptr();
    gen_wreg_ptr(ptr, reg);
    tcg_gen_ld_i64(ret, ptr, 0);
    tcg_temp_free_ptr(ptr);
    return ret;
}

void e2k_gen_store_wreg(int reg, TCGv_i64 val)
{
    TCGv_ptr ptr = tcg_temp_new_ptr();
    gen_wreg_ptr(ptr, reg);
    tcg_gen_st_i64(val, ptr, 0);
    tcg_temp_free_ptr(ptr);
}

static inline void gen_breg_offset(TCGv_i32 ret, int reg)
{
    assert(reg < 128);
    // TODO: exception cpu_wsz <= reg || cpu_rsz <= reg
    TCGv_i32 t0 = tcg_temp_new_i32();
    TCGv_i32 t1 = tcg_temp_new_i32();
    TCGv_i32 t2 = tcg_temp_new_i32();
    TCGv_i32 t3 = tcg_temp_new_i32();
    TCGv_i32 t4 = tcg_temp_new_i32();
    TCGv_i32 t5 = tcg_const_i32(WREGS_SIZE);
    TCGv_i32 t6 = tcg_temp_new_i32();

    // t2 = (index + rsz + rcur) % rsz
    tcg_gen_sub_i32(t0, e2k_cs.rsz, e2k_cs.rcur);
    tcg_gen_addi_i32(t1, t0, reg);
    e2k_gen_wrap_i32(t2, t1, e2k_cs.rsz);

    // (t2 + wbs + rbs) % WIN_REGS_COUNT
    tcg_gen_add_i32(t3, e2k_cs.wbs, e2k_cs.rbs);
    tcg_gen_add_i32(t4, t2, t3);
    e2k_gen_wrap_i32(t6, t4, t5);

    // (t6 * REG_SIZE_IN_BYTES
    tcg_gen_muli_i32(ret, t6, REG_SIZE);

    tcg_temp_free_i32(t6);
    tcg_temp_free_i32(t5);
    tcg_temp_free_i32(t4);
    tcg_temp_free_i32(t3);
    tcg_temp_free_i32(t2);
    tcg_temp_free_i32(t1);
    tcg_temp_free_i32(t0);
}

static inline void gen_breg_ptr(TCGv_ptr ret, int reg)
{
    TCGv_i32 t0 = tcg_temp_new_i32();
    TCGv_ptr t1 = tcg_temp_new_ptr();
    gen_breg_offset(t0, reg);
    tcg_gen_ext_i32_ptr(t1, t0);
    tcg_gen_add_ptr(ret, e2k_cs.win_ptr, t1);
    tcg_temp_free_ptr(t1);
    tcg_temp_free_i32(t0);
}

TCGv_i64 e2k_get_breg(DisasContext *dc, int reg)
{
    TCGv_i64 ret = e2k_get_temp(dc);
    TCGv_ptr ptr = tcg_temp_new_ptr();
    gen_breg_ptr(ptr, reg);
    tcg_gen_ld_i64(ret, ptr, 0);
    tcg_temp_free_ptr(ptr);
    return ret;
}

void e2k_gen_store_breg(int reg, TCGv_i64 val)
{
    TCGv_ptr ptr = tcg_temp_new_ptr();
    gen_breg_ptr(ptr, reg);
    tcg_gen_st_i64(val, ptr, 0);
    tcg_temp_free_ptr(ptr);
}

TCGv_i64 e2k_get_greg(DisasContext *dc, int reg)
{
    // TODO: rotated gregs
    assert(reg < 32);
    return e2k_cs.gregs[reg];
}

void e2k_gen_store_greg(int reg, TCGv_i64 val)
{
    // TODO: rotated gregs
    tcg_gen_mov_i64(e2k_cs.gregs[reg], val);
}