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Diffstat (limited to 'target-lm32/translate.c')
-rw-r--r--target-lm32/translate.c193
1 files changed, 118 insertions, 75 deletions
diff --git a/target-lm32/translate.c b/target-lm32/translate.c
index 6ea0ecd63b..80bffc7b27 100644
--- a/target-lm32/translate.c
+++ b/target-lm32/translate.c
@@ -64,7 +64,6 @@ enum {
/* This is the state at translation time. */
typedef struct DisasContext {
- CPULM32State *env;
target_ulong pc;
/* Decoder. */
@@ -80,9 +79,12 @@ typedef struct DisasContext {
unsigned int tb_flags, synced_flags; /* tb dependent flags. */
int is_jmp;
- int nr_nops;
struct TranslationBlock *tb;
int singlestep_enabled;
+
+ uint32_t features;
+ uint8_t num_breakpoints;
+ uint8_t num_watchpoints;
} DisasContext;
static const char *regnames[] = {
@@ -120,6 +122,12 @@ static inline void t_gen_raise_exception(DisasContext *dc, uint32_t index)
tcg_temp_free_i32(tmp);
}
+static inline void t_gen_illegal_insn(DisasContext *dc)
+{
+ tcg_gen_movi_tl(cpu_pc, dc->pc);
+ gen_helper_ill(cpu_env);
+}
+
static void gen_goto_tb(DisasContext *dc, int n, target_ulong dest)
{
TranslationBlock *tb;
@@ -421,8 +429,10 @@ static void dec_divu(DisasContext *dc)
LOG_DIS("divu r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
- if (!(dc->env->features & LM32_FEATURE_DIVIDE)) {
- cpu_abort(dc->env, "hardware divider is not available\n");
+ if (!(dc->features & LM32_FEATURE_DIVIDE)) {
+ qemu_log_mask(LOG_GUEST_ERROR, "hardware divider is not available\n");
+ t_gen_illegal_insn(dc);
+ return;
}
l1 = gen_new_label();
@@ -499,8 +509,10 @@ static void dec_modu(DisasContext *dc)
LOG_DIS("modu r%d, r%d, %d\n", dc->r2, dc->r0, dc->r1);
- if (!(dc->env->features & LM32_FEATURE_DIVIDE)) {
- cpu_abort(dc->env, "hardware divider is not available\n");
+ if (!(dc->features & LM32_FEATURE_DIVIDE)) {
+ qemu_log_mask(LOG_GUEST_ERROR, "hardware divider is not available\n");
+ t_gen_illegal_insn(dc);
+ return;
}
l1 = gen_new_label();
@@ -520,8 +532,11 @@ static void dec_mul(DisasContext *dc)
LOG_DIS("mul r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
}
- if (!(dc->env->features & LM32_FEATURE_MULTIPLY)) {
- cpu_abort(dc->env, "hardware multiplier is not available\n");
+ if (!(dc->features & LM32_FEATURE_MULTIPLY)) {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "hardware multiplier is not available\n");
+ t_gen_illegal_insn(dc);
+ return;
}
if (dc->format == OP_FMT_RI) {
@@ -585,20 +600,21 @@ static void dec_orhi(DisasContext *dc)
static void dec_scall(DisasContext *dc)
{
- if (dc->imm5 == 7) {
- LOG_DIS("scall\n");
- } else if (dc->imm5 == 2) {
+ switch (dc->imm5) {
+ case 2:
LOG_DIS("break\n");
- } else {
- cpu_abort(dc->env, "invalid opcode\n");
- }
-
- if (dc->imm5 == 7) {
- tcg_gen_movi_tl(cpu_pc, dc->pc);
- t_gen_raise_exception(dc, EXCP_SYSTEMCALL);
- } else {
tcg_gen_movi_tl(cpu_pc, dc->pc);
t_gen_raise_exception(dc, EXCP_BREAKPOINT);
+ break;
+ case 7:
+ LOG_DIS("scall\n");
+ tcg_gen_movi_tl(cpu_pc, dc->pc);
+ t_gen_raise_exception(dc, EXCP_SYSTEMCALL);
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR, "invalid opcode @0x%x", dc->pc);
+ t_gen_illegal_insn(dc);
+ break;
}
}
@@ -647,10 +663,10 @@ static void dec_rcsr(DisasContext *dc)
case CSR_WP1:
case CSR_WP2:
case CSR_WP3:
- cpu_abort(dc->env, "invalid read access csr=%x\n", dc->csr);
+ qemu_log_mask(LOG_GUEST_ERROR, "invalid read access csr=%x\n", dc->csr);
break;
default:
- cpu_abort(dc->env, "read_csr: unknown csr=%x\n", dc->csr);
+ qemu_log_mask(LOG_GUEST_ERROR, "read_csr: unknown csr=%x\n", dc->csr);
break;
}
}
@@ -671,8 +687,11 @@ static void dec_sextb(DisasContext *dc)
{
LOG_DIS("sextb r%d, r%d\n", dc->r2, dc->r0);
- if (!(dc->env->features & LM32_FEATURE_SIGN_EXTEND)) {
- cpu_abort(dc->env, "hardware sign extender is not available\n");
+ if (!(dc->features & LM32_FEATURE_SIGN_EXTEND)) {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "hardware sign extender is not available\n");
+ t_gen_illegal_insn(dc);
+ return;
}
tcg_gen_ext8s_tl(cpu_R[dc->r2], cpu_R[dc->r0]);
@@ -682,8 +701,11 @@ static void dec_sexth(DisasContext *dc)
{
LOG_DIS("sexth r%d, r%d\n", dc->r2, dc->r0);
- if (!(dc->env->features & LM32_FEATURE_SIGN_EXTEND)) {
- cpu_abort(dc->env, "hardware sign extender is not available\n");
+ if (!(dc->features & LM32_FEATURE_SIGN_EXTEND)) {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "hardware sign extender is not available\n");
+ t_gen_illegal_insn(dc);
+ return;
}
tcg_gen_ext16s_tl(cpu_R[dc->r2], cpu_R[dc->r0]);
@@ -709,8 +731,10 @@ static void dec_sl(DisasContext *dc)
LOG_DIS("sl r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
}
- if (!(dc->env->features & LM32_FEATURE_SHIFT)) {
- cpu_abort(dc->env, "hardware shifter is not available\n");
+ if (!(dc->features & LM32_FEATURE_SHIFT)) {
+ qemu_log_mask(LOG_GUEST_ERROR, "hardware shifter is not available\n");
+ t_gen_illegal_insn(dc);
+ return;
}
if (dc->format == OP_FMT_RI) {
@@ -731,22 +755,32 @@ static void dec_sr(DisasContext *dc)
LOG_DIS("sr r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
}
- if (!(dc->env->features & LM32_FEATURE_SHIFT)) {
- if (dc->format == OP_FMT_RI) {
- /* TODO: check r1 == 1 during runtime */
- } else {
- if (dc->imm5 != 1) {
- cpu_abort(dc->env, "hardware shifter is not available\n");
- }
- }
- }
-
+ /* The real CPU (w/o hardware shifter) only supports right shift by exactly
+ * one bit */
if (dc->format == OP_FMT_RI) {
+ if (!(dc->features & LM32_FEATURE_SHIFT) && (dc->imm5 != 1)) {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "hardware shifter is not available\n");
+ t_gen_illegal_insn(dc);
+ return;
+ }
tcg_gen_sari_tl(cpu_R[dc->r1], cpu_R[dc->r0], dc->imm5);
} else {
- TCGv t0 = tcg_temp_new();
+ int l1 = gen_new_label();
+ int l2 = gen_new_label();
+ TCGv t0 = tcg_temp_local_new();
tcg_gen_andi_tl(t0, cpu_R[dc->r1], 0x1f);
+
+ if (!(dc->features & LM32_FEATURE_SHIFT)) {
+ tcg_gen_brcondi_tl(TCG_COND_EQ, t0, 1, l1);
+ t_gen_illegal_insn(dc);
+ tcg_gen_br(l2);
+ }
+
+ gen_set_label(l1);
tcg_gen_sar_tl(cpu_R[dc->r2], cpu_R[dc->r0], t0);
+ gen_set_label(l2);
+
tcg_temp_free(t0);
}
}
@@ -759,22 +793,30 @@ static void dec_sru(DisasContext *dc)
LOG_DIS("sru r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
}
- if (!(dc->env->features & LM32_FEATURE_SHIFT)) {
- if (dc->format == OP_FMT_RI) {
- /* TODO: check r1 == 1 during runtime */
- } else {
- if (dc->imm5 != 1) {
- cpu_abort(dc->env, "hardware shifter is not available\n");
- }
- }
- }
-
if (dc->format == OP_FMT_RI) {
+ if (!(dc->features & LM32_FEATURE_SHIFT) && (dc->imm5 != 1)) {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "hardware shifter is not available\n");
+ t_gen_illegal_insn(dc);
+ return;
+ }
tcg_gen_shri_tl(cpu_R[dc->r1], cpu_R[dc->r0], dc->imm5);
} else {
- TCGv t0 = tcg_temp_new();
+ int l1 = gen_new_label();
+ int l2 = gen_new_label();
+ TCGv t0 = tcg_temp_local_new();
tcg_gen_andi_tl(t0, cpu_R[dc->r1], 0x1f);
+
+ if (!(dc->features & LM32_FEATURE_SHIFT)) {
+ tcg_gen_brcondi_tl(TCG_COND_EQ, t0, 1, l1);
+ t_gen_illegal_insn(dc);
+ tcg_gen_br(l2);
+ }
+
+ gen_set_label(l1);
tcg_gen_shr_tl(cpu_R[dc->r2], cpu_R[dc->r0], t0);
+ gen_set_label(l2);
+
tcg_temp_free(t0);
}
}
@@ -802,7 +844,8 @@ static void dec_user(DisasContext *dc)
{
LOG_DIS("user");
- cpu_abort(dc->env, "user insn undefined\n");
+ qemu_log_mask(LOG_GUEST_ERROR, "user instruction undefined\n");
+ t_gen_illegal_insn(dc);
}
static void dec_wcsr(DisasContext *dc)
@@ -860,34 +903,42 @@ static void dec_wcsr(DisasContext *dc)
gen_helper_wcsr_jrx(cpu_env, cpu_R[dc->r1]);
break;
case CSR_DC:
- tcg_gen_mov_tl(cpu_dc, cpu_R[dc->r1]);
+ gen_helper_wcsr_dc(cpu_env, cpu_R[dc->r1]);
break;
case CSR_BP0:
case CSR_BP1:
case CSR_BP2:
case CSR_BP3:
no = dc->csr - CSR_BP0;
- if (dc->env->num_bps <= no) {
- cpu_abort(dc->env, "breakpoint #%i is not available\n", no);
+ if (dc->num_breakpoints <= no) {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "breakpoint #%i is not available\n", no);
+ t_gen_illegal_insn(dc);
+ break;
}
- tcg_gen_mov_tl(cpu_bp[no], cpu_R[dc->r1]);
+ gen_helper_wcsr_bp(cpu_env, cpu_R[dc->r1], tcg_const_i32(no));
break;
case CSR_WP0:
case CSR_WP1:
case CSR_WP2:
case CSR_WP3:
no = dc->csr - CSR_WP0;
- if (dc->env->num_wps <= no) {
- cpu_abort(dc->env, "watchpoint #%i is not available\n", no);
+ if (dc->num_watchpoints <= no) {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "watchpoint #%i is not available\n", no);
+ t_gen_illegal_insn(dc);
+ break;
}
- tcg_gen_mov_tl(cpu_wp[no], cpu_R[dc->r1]);
+ gen_helper_wcsr_wp(cpu_env, cpu_R[dc->r1], tcg_const_i32(no));
break;
case CSR_CC:
case CSR_CFG:
- cpu_abort(dc->env, "invalid write access csr=%x\n", dc->csr);
+ qemu_log_mask(LOG_GUEST_ERROR, "invalid write access csr=%x\n",
+ dc->csr);
break;
default:
- cpu_abort(dc->env, "write_csr unknown csr=%x\n", dc->csr);
+ qemu_log_mask(LOG_GUEST_ERROR, "write_csr: unknown csr=%x\n",
+ dc->csr);
break;
}
}
@@ -933,7 +984,8 @@ static void dec_xor(DisasContext *dc)
static void dec_ill(DisasContext *dc)
{
- cpu_abort(dc->env, "unknown opcode 0x%02x\n", dc->opcode);
+ qemu_log_mask(LOG_GUEST_ERROR, "invalid opcode 0x%02x\n", dc->opcode);
+ t_gen_illegal_insn(dc);
}
typedef void (*DecoderInfo)(DisasContext *dc);
@@ -959,18 +1011,6 @@ static inline void decode(DisasContext *dc, uint32_t ir)
dc->ir = ir;
LOG_DIS("%8.8x\t", dc->ir);
- /* try guessing 'empty' instruction memory, although it may be a valid
- * instruction sequence (eg. srui r0, r0, 0) */
- if (dc->ir) {
- dc->nr_nops = 0;
- } else {
- LOG_DIS("nr_nops=%d\t", dc->nr_nops);
- dc->nr_nops++;
- if (dc->nr_nops > 4) {
- cpu_abort(dc->env, "fetching nop sequence\n");
- }
- }
-
dc->opcode = EXTRACT_FIELD(ir, 26, 31);
dc->imm5 = EXTRACT_FIELD(ir, 0, 4);
@@ -1026,7 +1066,9 @@ void gen_intermediate_code_internal(LM32CPU *cpu,
int max_insns;
pc_start = tb->pc;
- dc->env = env;
+ dc->features = cpu->features;
+ dc->num_breakpoints = cpu->num_breakpoints;
+ dc->num_watchpoints = cpu->num_watchpoints;
dc->tb = tb;
gen_opc_end = tcg_ctx.gen_opc_buf + OPC_MAX_SIZE;
@@ -1034,10 +1076,11 @@ void gen_intermediate_code_internal(LM32CPU *cpu,
dc->is_jmp = DISAS_NEXT;
dc->pc = pc_start;
dc->singlestep_enabled = cs->singlestep_enabled;
- dc->nr_nops = 0;
if (pc_start & 3) {
- cpu_abort(env, "LM32: unaligned PC=%x\n", pc_start);
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "unaligned PC=%x. Ignoring lowest bits.\n", pc_start);
+ pc_start &= ~3;
}
next_page_start = (pc_start & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE;
generated by cgit v1.2.3 (git 2.26.2) at 2025-01-17 19:10:37 +0000