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qemu/target/nios2/translate.c
Peter Maydell cab9f19370 target/nios2: Honour -semihosting-config userspace=on 
Honour the commandline -semihosting-config userspace=on option,
instead of always permitting userspace semihosting calls in system
emulation mode, by passing the correct value to the is_userspace
argument of semihosting_enabled().

Note that this is a behaviour change: if the user wants to
do semihosting calls from userspace they must now specifically
enable them on the command line.

nios2 semihosting is not implemented for linux-user builds.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220822141230.3658237-6-peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2022-09-13 17:18:21 +01:00

1119 lines
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/*
* Altera Nios II emulation for qemu: main translation routines.
*
* Copyright (C) 2016 Marek Vasut <marex@denx.de>
* Copyright (C) 2012 Chris Wulff <crwulff@gmail.com>
* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
* (Portions of this file that were originally from nios2sim-ng.)
*
* 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 2.1 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/lgpl-2.1.html>
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "tcg/tcg-op.h"
#include "exec/exec-all.h"
#include "disas/disas.h"
#include "exec/helper-proto.h"
#include "exec/helper-gen.h"
#include "exec/log.h"
#include "exec/cpu_ldst.h"
#include "exec/translator.h"
#include "qemu/qemu-print.h"
#include "exec/gen-icount.h"
#include "semihosting/semihost.h"
/* is_jmp field values */
#define DISAS_UPDATE DISAS_TARGET_1 /* cpu state was modified dynamically */
#define INSTRUCTION_FLG(func, flags) { (func), (flags) }
#define INSTRUCTION(func) \
INSTRUCTION_FLG(func, 0)
#define INSTRUCTION_NOP() \
INSTRUCTION_FLG(nop, 0)
#define INSTRUCTION_UNIMPLEMENTED() \
INSTRUCTION_FLG(gen_excp, EXCP_UNIMPL)
#define INSTRUCTION_ILLEGAL() \
INSTRUCTION_FLG(gen_excp, EXCP_ILLEGAL)
/* Special R-Type instruction opcode */
#define INSN_R_TYPE 0x3A
/* I-Type instruction parsing */
typedef struct {
uint8_t op;
union {
uint16_t u;
int16_t s;
} imm16;
uint8_t b;
uint8_t a;
} InstrIType;
#define I_TYPE(instr, code) \
InstrIType (instr) = { \
.op = extract32((code), 0, 6), \
.imm16.u = extract32((code), 6, 16), \
.b = extract32((code), 22, 5), \
.a = extract32((code), 27, 5), \
}
typedef target_ulong ImmFromIType(const InstrIType *);
static target_ulong imm_unsigned(const InstrIType *i)
{
return i->imm16.u;
}
static target_ulong imm_signed(const InstrIType *i)
{
return i->imm16.s;
}
static target_ulong imm_shifted(const InstrIType *i)
{
return i->imm16.u << 16;
}
/* R-Type instruction parsing */
typedef struct {
uint8_t op;
uint8_t imm5;
uint8_t opx;
uint8_t c;
uint8_t b;
uint8_t a;
} InstrRType;
#define R_TYPE(instr, code) \
InstrRType (instr) = { \
.op = extract32((code), 0, 6), \
.imm5 = extract32((code), 6, 5), \
.opx = extract32((code), 11, 6), \
.c = extract32((code), 17, 5), \
.b = extract32((code), 22, 5), \
.a = extract32((code), 27, 5), \
}
/* J-Type instruction parsing */
typedef struct {
uint8_t op;
uint32_t imm26;
} InstrJType;
#define J_TYPE(instr, code) \
InstrJType (instr) = { \
.op = extract32((code), 0, 6), \
.imm26 = extract32((code), 6, 26), \
}
typedef void GenFn2i(TCGv, TCGv, target_long);
typedef void GenFn3(TCGv, TCGv, TCGv);
typedef void GenFn4(TCGv, TCGv, TCGv, TCGv);
typedef struct DisasContext {
DisasContextBase base;
target_ulong pc;
int mem_idx;
uint32_t tb_flags;
TCGv sink;
const ControlRegState *cr_state;
bool eic_present;
} DisasContext;
static TCGv cpu_R[NUM_GP_REGS];
static TCGv cpu_pc;
#ifndef CONFIG_USER_ONLY
static TCGv cpu_crs_R[NUM_GP_REGS];
#endif
typedef struct Nios2Instruction {
void (*handler)(DisasContext *dc, uint32_t code, uint32_t flags);
uint32_t flags;
} Nios2Instruction;
static uint8_t get_opcode(uint32_t code)
{
I_TYPE(instr, code);
return instr.op;
}
static uint8_t get_opxcode(uint32_t code)
{
R_TYPE(instr, code);
return instr.opx;
}
static TCGv load_gpr(DisasContext *dc, unsigned reg)
{
assert(reg < NUM_GP_REGS);
/*
* With shadow register sets, register r0 does not necessarily contain 0,
* but it is overwhelmingly likely that it does -- software is supposed
* to have set r0 to 0 in every shadow register set before use.
*/
if (unlikely(reg == R_ZERO) && FIELD_EX32(dc->tb_flags, TBFLAGS, R0_0)) {
return tcg_constant_tl(0);
}
if (FIELD_EX32(dc->tb_flags, TBFLAGS, CRS0)) {
return cpu_R[reg];
}
#ifdef CONFIG_USER_ONLY
g_assert_not_reached();
#else
return cpu_crs_R[reg];
#endif
}
static TCGv dest_gpr(DisasContext *dc, unsigned reg)
{
assert(reg < NUM_GP_REGS);
/*
* The spec for shadow register sets isn't clear, but we assume that
* writes to r0 are discarded regardless of CRS.
*/
if (unlikely(reg == R_ZERO)) {
if (dc->sink == NULL) {
dc->sink = tcg_temp_new();
}
return dc->sink;
}
if (FIELD_EX32(dc->tb_flags, TBFLAGS, CRS0)) {
return cpu_R[reg];
}
#ifdef CONFIG_USER_ONLY
g_assert_not_reached();
#else
return cpu_crs_R[reg];
#endif
}
static void t_gen_helper_raise_exception(DisasContext *dc, uint32_t index)
{
/* Note that PC is advanced for all hardware exceptions. */
tcg_gen_movi_tl(cpu_pc, dc->base.pc_next);
gen_helper_raise_exception(cpu_env, tcg_constant_i32(index));
dc->base.is_jmp = DISAS_NORETURN;
}
static void gen_goto_tb(DisasContext *dc, int n, uint32_t dest)
{
const TranslationBlock *tb = dc->base.tb;
if (translator_use_goto_tb(&dc->base, dest)) {
tcg_gen_goto_tb(n);
tcg_gen_movi_tl(cpu_pc, dest);
tcg_gen_exit_tb(tb, n);
} else {
tcg_gen_movi_tl(cpu_pc, dest);
tcg_gen_lookup_and_goto_ptr();
}
dc->base.is_jmp = DISAS_NORETURN;
}
static void gen_jumpr(DisasContext *dc, int regno, bool is_call)
{
TCGLabel *l = gen_new_label();
TCGv test = tcg_temp_new();
TCGv dest = load_gpr(dc, regno);
tcg_gen_andi_tl(test, dest, 3);
tcg_gen_brcondi_tl(TCG_COND_NE, test, 0, l);
tcg_temp_free(test);
tcg_gen_mov_tl(cpu_pc, dest);
if (is_call) {
tcg_gen_movi_tl(dest_gpr(dc, R_RA), dc->base.pc_next);
}
tcg_gen_lookup_and_goto_ptr();
gen_set_label(l);
tcg_gen_st_tl(dest, cpu_env, offsetof(CPUNios2State, ctrl[CR_BADADDR]));
t_gen_helper_raise_exception(dc, EXCP_UNALIGND);
dc->base.is_jmp = DISAS_NORETURN;
}
static void gen_excp(DisasContext *dc, uint32_t code, uint32_t flags)
{
t_gen_helper_raise_exception(dc, flags);
}
static bool gen_check_supervisor(DisasContext *dc)
{
if (FIELD_EX32(dc->tb_flags, TBFLAGS, U)) {
/* CPU in user mode, privileged instruction called, stop. */
t_gen_helper_raise_exception(dc, EXCP_SUPERI);
return false;
}
return true;
}
/*
* Used as a placeholder for all instructions which do not have
* an effect on the simulator (e.g. flush, sync)
*/
static void nop(DisasContext *dc, uint32_t code, uint32_t flags)
{
/* Nothing to do here */
}
/*
* J-Type instructions
*/
static void jmpi(DisasContext *dc, uint32_t code, uint32_t flags)
{
J_TYPE(instr, code);
gen_goto_tb(dc, 0, (dc->pc & 0xF0000000) | (instr.imm26 << 2));
}
static void call(DisasContext *dc, uint32_t code, uint32_t flags)
{
tcg_gen_movi_tl(dest_gpr(dc, R_RA), dc->base.pc_next);
jmpi(dc, code, flags);
}
/*
* I-Type instructions
*/
/* Load instructions */
static void gen_ldx(DisasContext *dc, uint32_t code, uint32_t flags)
{
I_TYPE(instr, code);
TCGv addr = tcg_temp_new();
TCGv data = dest_gpr(dc, instr.b);
tcg_gen_addi_tl(addr, load_gpr(dc, instr.a), instr.imm16.s);
tcg_gen_qemu_ld_tl(data, addr, dc->mem_idx, flags);
tcg_temp_free(addr);
}
/* Store instructions */
static void gen_stx(DisasContext *dc, uint32_t code, uint32_t flags)
{
I_TYPE(instr, code);
TCGv val = load_gpr(dc, instr.b);
TCGv addr = tcg_temp_new();
tcg_gen_addi_tl(addr, load_gpr(dc, instr.a), instr.imm16.s);
tcg_gen_qemu_st_tl(val, addr, dc->mem_idx, flags);
tcg_temp_free(addr);
}
/* Branch instructions */
static void br(DisasContext *dc, uint32_t code, uint32_t flags)
{
I_TYPE(instr, code);
gen_goto_tb(dc, 0, dc->base.pc_next + (instr.imm16.s & -4));
}
static void gen_bxx(DisasContext *dc, uint32_t code, uint32_t flags)
{
I_TYPE(instr, code);
TCGLabel *l1 = gen_new_label();
tcg_gen_brcond_tl(flags, load_gpr(dc, instr.a), load_gpr(dc, instr.b), l1);
gen_goto_tb(dc, 0, dc->base.pc_next);
gen_set_label(l1);
gen_goto_tb(dc, 1, dc->base.pc_next + (instr.imm16.s & -4));
}
/* Comparison instructions */
static void do_i_cmpxx(DisasContext *dc, uint32_t insn,
TCGCond cond, ImmFromIType *imm)
{
I_TYPE(instr, insn);
tcg_gen_setcondi_tl(cond, dest_gpr(dc, instr.b),
load_gpr(dc, instr.a), imm(&instr));
}
#define gen_i_cmpxx(fname, imm) \
static void (fname)(DisasContext *dc, uint32_t code, uint32_t flags) \
{ do_i_cmpxx(dc, code, flags, imm); }
gen_i_cmpxx(gen_cmpxxsi, imm_signed)
gen_i_cmpxx(gen_cmpxxui, imm_unsigned)
/* Math/logic instructions */
static void do_i_math_logic(DisasContext *dc, uint32_t insn,
GenFn2i *fn, ImmFromIType *imm,
bool x_op_0_eq_x)
{
I_TYPE(instr, insn);
target_ulong val;
if (unlikely(instr.b == R_ZERO)) {
/* Store to R_ZERO is ignored -- this catches the canonical NOP. */
return;
}
val = imm(&instr);
if (instr.a == R_ZERO && FIELD_EX32(dc->tb_flags, TBFLAGS, R0_0)) {
/* This catches the canonical expansions of movi and movhi. */
tcg_gen_movi_tl(dest_gpr(dc, instr.b), x_op_0_eq_x ? val : 0);
} else {
fn(dest_gpr(dc, instr.b), load_gpr(dc, instr.a), val);
}
}
#define gen_i_math_logic(fname, insn, x_op_0, imm) \
static void (fname)(DisasContext *dc, uint32_t code, uint32_t flags) \
{ do_i_math_logic(dc, code, tcg_gen_##insn##_tl, imm, x_op_0); }
gen_i_math_logic(addi, addi, 1, imm_signed)
gen_i_math_logic(muli, muli, 0, imm_signed)
gen_i_math_logic(andi, andi, 0, imm_unsigned)
gen_i_math_logic(ori, ori, 1, imm_unsigned)
gen_i_math_logic(xori, xori, 1, imm_unsigned)
gen_i_math_logic(andhi, andi, 0, imm_shifted)
gen_i_math_logic(orhi , ori, 1, imm_shifted)
gen_i_math_logic(xorhi, xori, 1, imm_shifted)
/* rB <- prs.rA + sigma(IMM16) */
static void rdprs(DisasContext *dc, uint32_t code, uint32_t flags)
{
if (!dc->eic_present) {
t_gen_helper_raise_exception(dc, EXCP_ILLEGAL);
return;
}
if (!gen_check_supervisor(dc)) {
return;
}
#ifdef CONFIG_USER_ONLY
g_assert_not_reached();
#else
I_TYPE(instr, code);
TCGv dest = dest_gpr(dc, instr.b);
gen_helper_rdprs(dest, cpu_env, tcg_constant_i32(instr.a));
tcg_gen_addi_tl(dest, dest, instr.imm16.s);
#endif
}
/* Prototype only, defined below */
static void handle_r_type_instr(DisasContext *dc, uint32_t code,
uint32_t flags);
static const Nios2Instruction i_type_instructions[] = {
INSTRUCTION(call), /* call */
INSTRUCTION(jmpi), /* jmpi */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_FLG(gen_ldx, MO_UB), /* ldbu */
INSTRUCTION(addi), /* addi */
INSTRUCTION_FLG(gen_stx, MO_UB), /* stb */
INSTRUCTION(br), /* br */
INSTRUCTION_FLG(gen_ldx, MO_SB), /* ldb */
INSTRUCTION_FLG(gen_cmpxxsi, TCG_COND_GE), /* cmpgei */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
INSTRUCTION_FLG(gen_ldx, MO_UW), /* ldhu */
INSTRUCTION(andi), /* andi */
INSTRUCTION_FLG(gen_stx, MO_UW), /* sth */
INSTRUCTION_FLG(gen_bxx, TCG_COND_GE), /* bge */
INSTRUCTION_FLG(gen_ldx, MO_SW), /* ldh */
INSTRUCTION_FLG(gen_cmpxxsi, TCG_COND_LT), /* cmplti */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
INSTRUCTION_NOP(), /* initda */
INSTRUCTION(ori), /* ori */
INSTRUCTION_FLG(gen_stx, MO_UL), /* stw */
INSTRUCTION_FLG(gen_bxx, TCG_COND_LT), /* blt */
INSTRUCTION_FLG(gen_ldx, MO_UL), /* ldw */
INSTRUCTION_FLG(gen_cmpxxsi, TCG_COND_NE), /* cmpnei */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
INSTRUCTION_NOP(), /* flushda */
INSTRUCTION(xori), /* xori */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_FLG(gen_bxx, TCG_COND_NE), /* bne */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_FLG(gen_cmpxxsi, TCG_COND_EQ), /* cmpeqi */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
INSTRUCTION_FLG(gen_ldx, MO_UB), /* ldbuio */
INSTRUCTION(muli), /* muli */
INSTRUCTION_FLG(gen_stx, MO_UB), /* stbio */
INSTRUCTION_FLG(gen_bxx, TCG_COND_EQ), /* beq */
INSTRUCTION_FLG(gen_ldx, MO_SB), /* ldbio */
INSTRUCTION_FLG(gen_cmpxxui, TCG_COND_GEU), /* cmpgeui */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
INSTRUCTION_FLG(gen_ldx, MO_UW), /* ldhuio */
INSTRUCTION(andhi), /* andhi */
INSTRUCTION_FLG(gen_stx, MO_UW), /* sthio */
INSTRUCTION_FLG(gen_bxx, TCG_COND_GEU), /* bgeu */
INSTRUCTION_FLG(gen_ldx, MO_SW), /* ldhio */
INSTRUCTION_FLG(gen_cmpxxui, TCG_COND_LTU), /* cmpltui */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_UNIMPLEMENTED(), /* custom */
INSTRUCTION_NOP(), /* initd */
INSTRUCTION(orhi), /* orhi */
INSTRUCTION_FLG(gen_stx, MO_SL), /* stwio */
INSTRUCTION_FLG(gen_bxx, TCG_COND_LTU), /* bltu */
INSTRUCTION_FLG(gen_ldx, MO_UL), /* ldwio */
INSTRUCTION(rdprs), /* rdprs */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_FLG(handle_r_type_instr, 0), /* R-Type */
INSTRUCTION_NOP(), /* flushd */
INSTRUCTION(xorhi), /* xorhi */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
};
/*
* R-Type instructions
*/
/*
* status <- estatus
* PC <- ea
*/
static void eret(DisasContext *dc, uint32_t code, uint32_t flags)
{
if (!gen_check_supervisor(dc)) {
return;
}
#ifdef CONFIG_USER_ONLY
g_assert_not_reached();
#else
if (FIELD_EX32(dc->tb_flags, TBFLAGS, CRS0)) {
TCGv tmp = tcg_temp_new();
tcg_gen_ld_tl(tmp, cpu_env, offsetof(CPUNios2State, ctrl[CR_ESTATUS]));
gen_helper_eret(cpu_env, tmp, load_gpr(dc, R_EA));
tcg_temp_free(tmp);
} else {
gen_helper_eret(cpu_env, load_gpr(dc, R_SSTATUS), load_gpr(dc, R_EA));
}
dc->base.is_jmp = DISAS_NORETURN;
#endif
}
/* PC <- ra */
static void ret(DisasContext *dc, uint32_t code, uint32_t flags)
{
gen_jumpr(dc, R_RA, false);
}
/*
* status <- bstatus
* PC <- ba
*/
static void bret(DisasContext *dc, uint32_t code, uint32_t flags)
{
if (!gen_check_supervisor(dc)) {
return;
}
#ifdef CONFIG_USER_ONLY
g_assert_not_reached();
#else
TCGv tmp = tcg_temp_new();
tcg_gen_ld_tl(tmp, cpu_env, offsetof(CPUNios2State, ctrl[CR_BSTATUS]));
gen_helper_eret(cpu_env, tmp, load_gpr(dc, R_BA));
tcg_temp_free(tmp);
dc->base.is_jmp = DISAS_NORETURN;
#endif
}
/* PC <- rA */
static void jmp(DisasContext *dc, uint32_t code, uint32_t flags)
{
R_TYPE(instr, code);
gen_jumpr(dc, instr.a, false);
}
/* rC <- PC + 4 */
static void nextpc(DisasContext *dc, uint32_t code, uint32_t flags)
{
R_TYPE(instr, code);
tcg_gen_movi_tl(dest_gpr(dc, instr.c), dc->base.pc_next);
}
/*
* ra <- PC + 4
* PC <- rA
*/
static void callr(DisasContext *dc, uint32_t code, uint32_t flags)
{
R_TYPE(instr, code);
gen_jumpr(dc, instr.a, true);
}
/* rC <- ctlN */
static void rdctl(DisasContext *dc, uint32_t code, uint32_t flags)
{
if (!gen_check_supervisor(dc)) {
return;
}
#ifdef CONFIG_USER_ONLY
g_assert_not_reached();
#else
R_TYPE(instr, code);
TCGv t1, t2, dest = dest_gpr(dc, instr.c);
/* Reserved registers read as zero. */
if (nios2_cr_reserved(&dc->cr_state[instr.imm5])) {
tcg_gen_movi_tl(dest, 0);
return;
}
switch (instr.imm5) {
case CR_IPENDING:
/*
* The value of the ipending register is synthetic.
* In hw, this is the AND of a set of hardware irq lines
* with the ienable register. In qemu, we re-use the space
* of CR_IPENDING to store the set of irq lines, and so we
* must perform the AND here, and anywhere else we need the
* guest value of ipending.
*/
t1 = tcg_temp_new();
t2 = tcg_temp_new();
tcg_gen_ld_tl(t1, cpu_env, offsetof(CPUNios2State, ctrl[CR_IPENDING]));
tcg_gen_ld_tl(t2, cpu_env, offsetof(CPUNios2State, ctrl[CR_IENABLE]));
tcg_gen_and_tl(dest, t1, t2);
tcg_temp_free(t1);
tcg_temp_free(t2);
break;
default:
tcg_gen_ld_tl(dest, cpu_env,
offsetof(CPUNios2State, ctrl[instr.imm5]));
break;
}
#endif
}
/* ctlN <- rA */
static void wrctl(DisasContext *dc, uint32_t code, uint32_t flags)
{
if (!gen_check_supervisor(dc)) {
return;
}
#ifdef CONFIG_USER_ONLY
g_assert_not_reached();
#else
R_TYPE(instr, code);
TCGv v = load_gpr(dc, instr.a);
uint32_t ofs = offsetof(CPUNios2State, ctrl[instr.imm5]);
uint32_t wr = dc->cr_state[instr.imm5].writable;
uint32_t ro = dc->cr_state[instr.imm5].readonly;
/* Skip reserved or readonly registers. */
if (wr == 0) {
return;
}
switch (instr.imm5) {
case CR_PTEADDR:
gen_helper_mmu_write_pteaddr(cpu_env, v);
break;
case CR_TLBACC:
gen_helper_mmu_write_tlbacc(cpu_env, v);
break;
case CR_TLBMISC:
gen_helper_mmu_write_tlbmisc(cpu_env, v);
break;
case CR_STATUS:
case CR_IENABLE:
/* If interrupts were enabled using WRCTL, trigger them. */
dc->base.is_jmp = DISAS_UPDATE;
/* fall through */
default:
if (wr == -1) {
/* The register is entirely writable. */
tcg_gen_st_tl(v, cpu_env, ofs);
} else {
/*
* The register is partially read-only or reserved:
* merge the value.
*/
TCGv n = tcg_temp_new();
tcg_gen_andi_tl(n, v, wr);
if (ro != 0) {
TCGv o = tcg_temp_new();
tcg_gen_ld_tl(o, cpu_env, ofs);
tcg_gen_andi_tl(o, o, ro);
tcg_gen_or_tl(n, n, o);
tcg_temp_free(o);
}
tcg_gen_st_tl(n, cpu_env, ofs);
tcg_temp_free(n);
}
break;
}
#endif
}
/* prs.rC <- rA */
static void wrprs(DisasContext *dc, uint32_t code, uint32_t flags)
{
if (!dc->eic_present) {
t_gen_helper_raise_exception(dc, EXCP_ILLEGAL);
return;
}
if (!gen_check_supervisor(dc)) {
return;
}
#ifdef CONFIG_USER_ONLY
g_assert_not_reached();
#else
R_TYPE(instr, code);
gen_helper_wrprs(cpu_env, tcg_constant_i32(instr.c),
load_gpr(dc, instr.a));
/*
* The expected write to PRS[r0] is 0, from CRS[r0].
* If not, and CRS == PRS (which we cannot tell from here),
* we may now have a non-zero value in our current r0.
* By ending the TB, we re-evaluate tb_flags and find out.
*/
if (instr.c == 0
&& (instr.a != 0 || !FIELD_EX32(dc->tb_flags, TBFLAGS, R0_0))) {
dc->base.is_jmp = DISAS_UPDATE;
}
#endif
}
/* Comparison instructions */
static void gen_cmpxx(DisasContext *dc, uint32_t code, uint32_t flags)
{
R_TYPE(instr, code);
tcg_gen_setcond_tl(flags, dest_gpr(dc, instr.c),
load_gpr(dc, instr.a), load_gpr(dc, instr.b));
}
/* Math/logic instructions */
static void do_ri_math_logic(DisasContext *dc, uint32_t insn, GenFn2i *fn)
{
R_TYPE(instr, insn);
fn(dest_gpr(dc, instr.c), load_gpr(dc, instr.a), instr.imm5);
}
static void do_rr_math_logic(DisasContext *dc, uint32_t insn, GenFn3 *fn)
{
R_TYPE(instr, insn);
fn(dest_gpr(dc, instr.c), load_gpr(dc, instr.a), load_gpr(dc, instr.b));
}
#define gen_ri_math_logic(fname, insn) \
static void (fname)(DisasContext *dc, uint32_t code, uint32_t flags) \
{ do_ri_math_logic(dc, code, tcg_gen_##insn##_tl); }
#define gen_rr_math_logic(fname, insn) \
static void (fname)(DisasContext *dc, uint32_t code, uint32_t flags) \
{ do_rr_math_logic(dc, code, tcg_gen_##insn##_tl); }
gen_rr_math_logic(add, add)
gen_rr_math_logic(sub, sub)
gen_rr_math_logic(mul, mul)
gen_rr_math_logic(and, and)
gen_rr_math_logic(or, or)
gen_rr_math_logic(xor, xor)
gen_rr_math_logic(nor, nor)
gen_ri_math_logic(srai, sari)
gen_ri_math_logic(srli, shri)
gen_ri_math_logic(slli, shli)
gen_ri_math_logic(roli, rotli)
static void do_rr_mul_high(DisasContext *dc, uint32_t insn, GenFn4 *fn)
{
R_TYPE(instr, insn);
TCGv discard = tcg_temp_new();
fn(discard, dest_gpr(dc, instr.c),
load_gpr(dc, instr.a), load_gpr(dc, instr.b));
tcg_temp_free(discard);
}
#define gen_rr_mul_high(fname, insn) \
static void (fname)(DisasContext *dc, uint32_t code, uint32_t flags) \
{ do_rr_mul_high(dc, code, tcg_gen_##insn##_tl); }
gen_rr_mul_high(mulxss, muls2)
gen_rr_mul_high(mulxuu, mulu2)
gen_rr_mul_high(mulxsu, mulsu2)
static void do_rr_shift(DisasContext *dc, uint32_t insn, GenFn3 *fn)
{
R_TYPE(instr, insn);
TCGv sh = tcg_temp_new();
tcg_gen_andi_tl(sh, load_gpr(dc, instr.b), 31);
fn(dest_gpr(dc, instr.c), load_gpr(dc, instr.a), sh);
tcg_temp_free(sh);
}
#define gen_rr_shift(fname, insn) \
static void (fname)(DisasContext *dc, uint32_t code, uint32_t flags) \
{ do_rr_shift(dc, code, tcg_gen_##insn##_tl); }
gen_rr_shift(sra, sar)
gen_rr_shift(srl, shr)
gen_rr_shift(sll, shl)
gen_rr_shift(rol, rotl)
gen_rr_shift(ror, rotr)
static void divs(DisasContext *dc, uint32_t code, uint32_t flags)
{
R_TYPE(instr, (code));
gen_helper_divs(dest_gpr(dc, instr.c), cpu_env,
load_gpr(dc, instr.a), load_gpr(dc, instr.b));
}
static void divu(DisasContext *dc, uint32_t code, uint32_t flags)
{
R_TYPE(instr, (code));
gen_helper_divu(dest_gpr(dc, instr.c), cpu_env,
load_gpr(dc, instr.a), load_gpr(dc, instr.b));
}
static void trap(DisasContext *dc, uint32_t code, uint32_t flags)
{
#ifdef CONFIG_USER_ONLY
/*
* The imm5 field is not stored anywhere on real hw; the kernel
* has to load the insn and extract the field. But we can make
* things easier for cpu_loop if we pop this into env->error_code.
*/
R_TYPE(instr, code);
tcg_gen_st_i32(tcg_constant_i32(instr.imm5), cpu_env,
offsetof(CPUNios2State, error_code));
#endif
t_gen_helper_raise_exception(dc, EXCP_TRAP);
}
static void gen_break(DisasContext *dc, uint32_t code, uint32_t flags)
{
#ifndef CONFIG_USER_ONLY
/* The semihosting instruction is "break 1". */
bool is_user = FIELD_EX32(dc->tb_flags, TBFLAGS, U);
R_TYPE(instr, code);
if (semihosting_enabled(is_user) && instr.imm5 == 1) {
t_gen_helper_raise_exception(dc, EXCP_SEMIHOST);
return;
}
#endif
t_gen_helper_raise_exception(dc, EXCP_BREAK);
}
static const Nios2Instruction r_type_instructions[] = {
INSTRUCTION_ILLEGAL(),
INSTRUCTION(eret), /* eret */
INSTRUCTION(roli), /* roli */
INSTRUCTION(rol), /* rol */
INSTRUCTION_NOP(), /* flushp */
INSTRUCTION(ret), /* ret */
INSTRUCTION(nor), /* nor */
INSTRUCTION(mulxuu), /* mulxuu */
INSTRUCTION_FLG(gen_cmpxx, TCG_COND_GE), /* cmpge */
INSTRUCTION(bret), /* bret */
INSTRUCTION_ILLEGAL(),
INSTRUCTION(ror), /* ror */
INSTRUCTION_NOP(), /* flushi */
INSTRUCTION(jmp), /* jmp */
INSTRUCTION(and), /* and */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_FLG(gen_cmpxx, TCG_COND_LT), /* cmplt */
INSTRUCTION_ILLEGAL(),
INSTRUCTION(slli), /* slli */
INSTRUCTION(sll), /* sll */
INSTRUCTION(wrprs), /* wrprs */
INSTRUCTION_ILLEGAL(),
INSTRUCTION(or), /* or */
INSTRUCTION(mulxsu), /* mulxsu */
INSTRUCTION_FLG(gen_cmpxx, TCG_COND_NE), /* cmpne */
INSTRUCTION_ILLEGAL(),
INSTRUCTION(srli), /* srli */
INSTRUCTION(srl), /* srl */
INSTRUCTION(nextpc), /* nextpc */
INSTRUCTION(callr), /* callr */
INSTRUCTION(xor), /* xor */
INSTRUCTION(mulxss), /* mulxss */
INSTRUCTION_FLG(gen_cmpxx, TCG_COND_EQ), /* cmpeq */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
INSTRUCTION(divu), /* divu */
INSTRUCTION(divs), /* div */
INSTRUCTION(rdctl), /* rdctl */
INSTRUCTION(mul), /* mul */
INSTRUCTION_FLG(gen_cmpxx, TCG_COND_GEU), /* cmpgeu */
INSTRUCTION_NOP(), /* initi */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
INSTRUCTION(trap), /* trap */
INSTRUCTION(wrctl), /* wrctl */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_FLG(gen_cmpxx, TCG_COND_LTU), /* cmpltu */
INSTRUCTION(add), /* add */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
INSTRUCTION(gen_break), /* break */
INSTRUCTION_ILLEGAL(),
INSTRUCTION(nop), /* nop */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
INSTRUCTION(sub), /* sub */
INSTRUCTION(srai), /* srai */
INSTRUCTION(sra), /* sra */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
};
static void handle_r_type_instr(DisasContext *dc, uint32_t code, uint32_t flags)
{
uint8_t opx;
const Nios2Instruction *instr;
opx = get_opxcode(code);
if (unlikely(opx >= ARRAY_SIZE(r_type_instructions))) {
goto illegal_op;
}
instr = &r_type_instructions[opx];
instr->handler(dc, code, instr->flags);
return;
illegal_op:
t_gen_helper_raise_exception(dc, EXCP_ILLEGAL);
}
static const char * const gr_regnames[NUM_GP_REGS] = {
"zero", "at", "r2", "r3",
"r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11",
"r12", "r13", "r14", "r15",
"r16", "r17", "r18", "r19",
"r20", "r21", "r22", "r23",
"et", "bt", "gp", "sp",
"fp", "ea", "ba", "ra",
};
#ifndef CONFIG_USER_ONLY
static const char * const cr_regnames[NUM_CR_REGS] = {
"status", "estatus", "bstatus", "ienable",
"ipending", "cpuid", "res6", "exception",
"pteaddr", "tlbacc", "tlbmisc", "reserved1",
"badaddr", "config", "mpubase", "mpuacc",
"res16", "res17", "res18", "res19",
"res20", "res21", "res22", "res23",
"res24", "res25", "res26", "res27",
"res28", "res29", "res30", "res31",
};
#endif
#include "exec/gen-icount.h"
/* generate intermediate code for basic block 'tb'. */
static void nios2_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
{
DisasContext *dc = container_of(dcbase, DisasContext, base);
CPUNios2State *env = cs->env_ptr;
Nios2CPU *cpu = env_archcpu(env);
int page_insns;
dc->mem_idx = cpu_mmu_index(env, false);
dc->cr_state = cpu->cr_state;
dc->tb_flags = dc->base.tb->flags;
dc->eic_present = cpu->eic_present;
/* Bound the number of insns to execute to those left on the page. */
page_insns = -(dc->base.pc_first | TARGET_PAGE_MASK) / 4;
dc->base.max_insns = MIN(page_insns, dc->base.max_insns);
}
static void nios2_tr_tb_start(DisasContextBase *db, CPUState *cs)
{
}
static void nios2_tr_insn_start(DisasContextBase *dcbase, CPUState *cs)
{
tcg_gen_insn_start(dcbase->pc_next);
}
static void nios2_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs)
{
DisasContext *dc = container_of(dcbase, DisasContext, base);
CPUNios2State *env = cs->env_ptr;
const Nios2Instruction *instr;
uint32_t code, pc;
uint8_t op;
pc = dc->base.pc_next;
dc->pc = pc;
dc->base.pc_next = pc + 4;
/* Decode an instruction */
code = cpu_ldl_code(env, pc);
op = get_opcode(code);
if (unlikely(op >= ARRAY_SIZE(i_type_instructions))) {
t_gen_helper_raise_exception(dc, EXCP_ILLEGAL);
return;
}
dc->sink = NULL;
instr = &i_type_instructions[op];
instr->handler(dc, code, instr->flags);
if (dc->sink) {
tcg_temp_free(dc->sink);
}
}
static void nios2_tr_tb_stop(DisasContextBase *dcbase, CPUState *cs)
{
DisasContext *dc = container_of(dcbase, DisasContext, base);
/* Indicate where the next block should start */
switch (dc->base.is_jmp) {
case DISAS_TOO_MANY:
gen_goto_tb(dc, 0, dc->base.pc_next);
break;
case DISAS_UPDATE:
/* Save the current PC, and return to the main loop. */
tcg_gen_movi_tl(cpu_pc, dc->base.pc_next);
tcg_gen_exit_tb(NULL, 0);
break;
case DISAS_NORETURN:
/* nothing more to generate */
break;
default:
g_assert_not_reached();
}
}
static void nios2_tr_disas_log(const DisasContextBase *dcbase,
CPUState *cpu, FILE *logfile)
{
fprintf(logfile, "IN: %s\n", lookup_symbol(dcbase->pc_first));
target_disas(logfile, cpu, dcbase->pc_first, dcbase->tb->size);
}
static const TranslatorOps nios2_tr_ops = {
.init_disas_context = nios2_tr_init_disas_context,
.tb_start = nios2_tr_tb_start,
.insn_start = nios2_tr_insn_start,
.translate_insn = nios2_tr_translate_insn,
.tb_stop = nios2_tr_tb_stop,
.disas_log = nios2_tr_disas_log,
};
void gen_intermediate_code(CPUState *cs, TranslationBlock *tb, int max_insns,
target_ulong pc, void *host_pc)
{
DisasContext dc;
translator_loop(cs, tb, max_insns, pc, host_pc, &nios2_tr_ops, &dc.base);
}
void nios2_cpu_dump_state(CPUState *cs, FILE *f, int flags)
{
Nios2CPU *cpu = NIOS2_CPU(cs);
CPUNios2State *env = &cpu->env;
int i;
qemu_fprintf(f, "IN: PC=%x %s\n", env->pc, lookup_symbol(env->pc));
for (i = 0; i < NUM_GP_REGS; i++) {
qemu_fprintf(f, "%9s=%8.8x ", gr_regnames[i], env->regs[i]);
if ((i + 1) % 4 == 0) {
qemu_fprintf(f, "\n");
}
}
#if !defined(CONFIG_USER_ONLY)
int j;
for (i = j = 0; i < NUM_CR_REGS; i++) {
if (!nios2_cr_reserved(&cpu->cr_state[i])) {
qemu_fprintf(f, "%9s=%8.8x ", cr_regnames[i], env->ctrl[i]);
if (++j % 4 == 0) {
qemu_fprintf(f, "\n");
}
}
}
if (j % 4 != 0) {
qemu_fprintf(f, "\n");
}
if (cpu->mmu_present) {
qemu_fprintf(f, " mmu write: VPN=%05X PID %02X TLBACC %08X\n",
env->mmu.pteaddr_wr & R_CR_PTEADDR_VPN_MASK,
FIELD_EX32(env->mmu.tlbmisc_wr, CR_TLBMISC, PID),
env->mmu.tlbacc_wr);
}
#endif
qemu_fprintf(f, "\n\n");
}
void nios2_tcg_init(void)
{
#ifndef CONFIG_USER_ONLY
TCGv_ptr crs = tcg_global_mem_new_ptr(cpu_env,
offsetof(CPUNios2State, regs), "crs");
for (int i = 0; i < NUM_GP_REGS; i++) {
cpu_crs_R[i] = tcg_global_mem_new(crs, 4 * i, gr_regnames[i]);
}
#define offsetof_regs0(N) offsetof(CPUNios2State, shadow_regs[0][N])
#else
#define offsetof_regs0(N) offsetof(CPUNios2State, regs[N])
#endif
for (int i = 0; i < NUM_GP_REGS; i++) {
cpu_R[i] = tcg_global_mem_new(cpu_env, offsetof_regs0(i),
gr_regnames[i]);
}
#undef offsetof_regs0
cpu_pc = tcg_global_mem_new(cpu_env,
offsetof(CPUNios2State, pc), "pc");
}
void restore_state_to_opc(CPUNios2State *env, TranslationBlock *tb,
target_ulong *data)
{
env->pc = data[0];
}
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