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-rw-r--r--target-alpha/translate.c336
1 files changed, 191 insertions, 145 deletions
diff --git a/target-alpha/translate.c b/target-alpha/translate.c
index d7591cc9bd..2a9cee9c6b 100644
--- a/target-alpha/translate.c
+++ b/target-alpha/translate.c
@@ -43,12 +43,13 @@
typedef struct DisasContext DisasContext;
struct DisasContext {
+ struct TranslationBlock *tb;
+ CPUAlphaState *env;
uint64_t pc;
int mem_idx;
#if !defined (CONFIG_USER_ONLY)
int pal_mode;
#endif
- CPUAlphaState *env;
uint32_t amask;
/* Current rounding mode for this TB. */
@@ -57,6 +58,25 @@ struct DisasContext {
int tb_ftz;
};
+/* Return values from translate_one, indicating the state of the TB.
+ Note that zero indicates that we are not exiting the TB. */
+
+typedef enum {
+ NO_EXIT,
+
+ /* We have emitted one or more goto_tb. No fixup required. */
+ EXIT_GOTO_TB,
+
+ /* We are not using a goto_tb (for whatever reason), but have updated
+ the PC (for whatever reason), so there's no need to do it again on
+ exiting the TB. */
+ EXIT_PC_UPDATED,
+
+ /* We are exiting the TB, but have neither emitted a goto_tb, nor
+ updated the PC for the next instruction to be executed. */
+ EXIT_PC_STALE
+} ExitStatus;
+
/* global register indexes */
static TCGv_ptr cpu_env;
static TCGv cpu_ir[31];
@@ -300,77 +320,126 @@ static inline void gen_store_mem(DisasContext *ctx,
tcg_temp_free(addr);
}
-static void gen_bcond_pcload(DisasContext *ctx, int32_t disp, int lab_true)
+static int use_goto_tb(DisasContext *ctx, uint64_t dest)
{
- int lab_over = gen_new_label();
+ /* Check for the dest on the same page as the start of the TB. We
+ also want to suppress goto_tb in the case of single-steping and IO. */
+ return (((ctx->tb->pc ^ dest) & TARGET_PAGE_MASK) == 0
+ && !ctx->env->singlestep_enabled
+ && !(ctx->tb->cflags & CF_LAST_IO));
+}
- tcg_gen_movi_i64(cpu_pc, ctx->pc);
- tcg_gen_br(lab_over);
- gen_set_label(lab_true);
- tcg_gen_movi_i64(cpu_pc, ctx->pc + (int64_t)(disp << 2));
- gen_set_label(lab_over);
+static ExitStatus gen_bdirect(DisasContext *ctx, int ra, int32_t disp)
+{
+ uint64_t dest = ctx->pc + (disp << 2);
+
+ if (ra != 31) {
+ tcg_gen_movi_i64(cpu_ir[ra], ctx->pc);
+ }
+
+ /* Notice branch-to-next; used to initialize RA with the PC. */
+ if (disp == 0) {
+ return 0;
+ } else if (use_goto_tb(ctx, dest)) {
+ tcg_gen_goto_tb(0);
+ tcg_gen_movi_i64(cpu_pc, dest);
+ tcg_gen_exit_tb((long)ctx->tb);
+ return EXIT_GOTO_TB;
+ } else {
+ tcg_gen_movi_i64(cpu_pc, dest);
+ return EXIT_PC_UPDATED;
+ }
}
-static void gen_bcond(DisasContext *ctx, TCGCond cond, int ra,
- int32_t disp, int mask)
+static ExitStatus gen_bcond_internal(DisasContext *ctx, TCGCond cond,
+ TCGv cmp, int32_t disp)
{
+ uint64_t dest = ctx->pc + (disp << 2);
int lab_true = gen_new_label();
- if (likely(ra != 31)) {
+ if (use_goto_tb(ctx, dest)) {
+ tcg_gen_brcondi_i64(cond, cmp, 0, lab_true);
+
+ tcg_gen_goto_tb(0);
+ tcg_gen_movi_i64(cpu_pc, ctx->pc);
+ tcg_gen_exit_tb((long)ctx->tb);
+
+ gen_set_label(lab_true);
+ tcg_gen_goto_tb(1);
+ tcg_gen_movi_i64(cpu_pc, dest);
+ tcg_gen_exit_tb((long)ctx->tb + 1);
+
+ return EXIT_GOTO_TB;
+ } else {
+ int lab_over = gen_new_label();
+
+ /* ??? Consider using either
+ movi pc, next
+ addi tmp, pc, disp
+ movcond pc, cond, 0, tmp, pc
+ or
+ setcond tmp, cond, 0
+ movi pc, next
+ neg tmp, tmp
+ andi tmp, tmp, disp
+ add pc, pc, tmp
+ The current diamond subgraph surely isn't efficient. */
+
+ tcg_gen_brcondi_i64(cond, cmp, 0, lab_true);
+ tcg_gen_movi_i64(cpu_pc, ctx->pc);
+ tcg_gen_br(lab_over);
+ gen_set_label(lab_true);
+ tcg_gen_movi_i64(cpu_pc, dest);
+ gen_set_label(lab_over);
+
+ return EXIT_PC_UPDATED;
+ }
+}
+
+static ExitStatus gen_bcond(DisasContext *ctx, TCGCond cond, int ra,
+ int32_t disp, int mask)
+{
+ TCGv cmp_tmp;
+
+ if (unlikely(ra == 31)) {
+ cmp_tmp = tcg_const_i64(0);
+ } else {
+ cmp_tmp = tcg_temp_new();
if (mask) {
- TCGv tmp = tcg_temp_new();
- tcg_gen_andi_i64(tmp, cpu_ir[ra], 1);
- tcg_gen_brcondi_i64(cond, tmp, 0, lab_true);
- tcg_temp_free(tmp);
+ tcg_gen_andi_i64(cmp_tmp, cpu_ir[ra], 1);
} else {
- tcg_gen_brcondi_i64(cond, cpu_ir[ra], 0, lab_true);
+ tcg_gen_mov_i64(cmp_tmp, cpu_ir[ra]);
}
- } else {
- /* Very uncommon case - Do not bother to optimize. */
- TCGv tmp = tcg_const_i64(0);
- tcg_gen_brcondi_i64(cond, tmp, 0, lab_true);
- tcg_temp_free(tmp);
}
- gen_bcond_pcload(ctx, disp, lab_true);
+
+ return gen_bcond_internal(ctx, cond, cmp_tmp, disp);
}
-/* Generate a forward TCG branch to LAB_TRUE if RA cmp 0.0.
- This is complicated by the fact that -0.0 compares the same as +0.0. */
+/* Fold -0.0 for comparison with COND. */
-static void gen_fbcond_internal(TCGCond cond, TCGv src, int lab_true)
+static void gen_fold_mzero(TCGCond cond, TCGv dest, TCGv src)
{
- int lab_false = -1;
uint64_t mzero = 1ull << 63;
- TCGv tmp;
switch (cond) {
case TCG_COND_LE:
case TCG_COND_GT:
/* For <= or >, the -0.0 value directly compares the way we want. */
- tcg_gen_brcondi_i64(cond, src, 0, lab_true);
+ tcg_gen_mov_i64(dest, src);
break;
case TCG_COND_EQ:
case TCG_COND_NE:
/* For == or !=, we can simply mask off the sign bit and compare. */
- /* ??? Assume that the temporary is reclaimed at the branch. */
- tmp = tcg_temp_new();
- tcg_gen_andi_i64(tmp, src, mzero - 1);
- tcg_gen_brcondi_i64(cond, tmp, 0, lab_true);
+ tcg_gen_andi_i64(dest, src, mzero - 1);
break;
case TCG_COND_GE:
- /* For >=, emit two branches to the destination. */
- tcg_gen_brcondi_i64(cond, src, 0, lab_true);
- tcg_gen_brcondi_i64(TCG_COND_EQ, src, mzero, lab_true);
- break;
-
case TCG_COND_LT:
- /* For <, first filter out -0.0 to what will be the fallthru. */
- lab_false = gen_new_label();
- tcg_gen_brcondi_i64(TCG_COND_EQ, src, mzero, lab_false);
- tcg_gen_brcondi_i64(cond, src, 0, lab_true);
- gen_set_label(lab_false);
+ /* For >= or <, map -0.0 to +0.0 via comparison and mask. */
+ tcg_gen_setcondi_i64(TCG_COND_NE, dest, src, mzero);
+ tcg_gen_neg_i64(dest, dest);
+ tcg_gen_and_i64(dest, dest, src);
break;
default:
@@ -378,24 +447,24 @@ static void gen_fbcond_internal(TCGCond cond, TCGv src, int lab_true)
}
}
-static void gen_fbcond(DisasContext *ctx, TCGCond cond, int ra, int32_t disp)
+static ExitStatus gen_fbcond(DisasContext *ctx, TCGCond cond, int ra,
+ int32_t disp)
{
- int lab_true;
+ TCGv cmp_tmp;
if (unlikely(ra == 31)) {
/* Very uncommon case, but easier to optimize it to an integer
comparison than continuing with the floating point comparison. */
- gen_bcond(ctx, cond, ra, disp, 0);
- return;
+ return gen_bcond(ctx, cond, ra, disp, 0);
}
- lab_true = gen_new_label();
- gen_fbcond_internal(cond, cpu_fir[ra], lab_true);
- gen_bcond_pcload(ctx, disp, lab_true);
+ cmp_tmp = tcg_temp_new();
+ gen_fold_mzero(cond, cmp_tmp, cpu_fir[ra]);
+ return gen_bcond_internal(ctx, cond, cmp_tmp, disp);
}
static void gen_cmov(TCGCond cond, int ra, int rb, int rc,
- int islit, uint8_t lit, int mask)
+ int islit, uint8_t lit, int mask)
{
TCGCond inv_cond = tcg_invert_cond(cond);
int l1;
@@ -429,18 +498,23 @@ static void gen_cmov(TCGCond cond, int ra, int rb, int rc,
static void gen_fcmov(TCGCond cond, int ra, int rb, int rc)
{
- TCGv va = cpu_fir[ra];
+ TCGv cmp_tmp;
int l1;
- if (unlikely(rc == 31))
+ if (unlikely(rc == 31)) {
return;
+ }
+
+ cmp_tmp = tcg_temp_new();
if (unlikely(ra == 31)) {
- /* ??? Assume that the temporary is reclaimed at the branch. */
- va = tcg_const_i64(0);
+ tcg_gen_movi_i64(cmp_tmp, 0);
+ } else {
+ gen_fold_mzero(cond, cmp_tmp, cpu_fir[ra]);
}
l1 = gen_new_label();
- gen_fbcond_internal(tcg_invert_cond(cond), va, l1);
+ tcg_gen_brcondi_i64(tcg_invert_cond(cond), cmp_tmp, 0, l1);
+ tcg_temp_free(cmp_tmp);
if (rb != 31)
tcg_gen_mov_i64(cpu_fir[rc], cpu_fir[rb]);
@@ -1335,14 +1409,14 @@ static void gen_rx(int ra, int set)
tcg_temp_free_i32(tmp);
}
-static inline int translate_one(DisasContext *ctx, uint32_t insn)
+static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
{
uint32_t palcode;
int32_t disp21, disp16, disp12;
uint16_t fn11;
uint8_t opc, ra, rb, rc, fpfn, fn7, fn2, islit, real_islit;
uint8_t lit;
- int ret;
+ ExitStatus ret;
/* Decode all instruction fields */
opc = insn >> 26;
@@ -1363,10 +1437,10 @@ static inline int translate_one(DisasContext *ctx, uint32_t insn)
fpfn = fn11 & 0x3F;
fn7 = (insn >> 5) & 0x0000007F;
fn2 = (insn >> 5) & 0x00000003;
- ret = 0;
LOG_DISAS("opc %02x ra %2d rb %2d rc %2d disp16 %6d\n",
opc, ra, rb, rc, disp16);
+ ret = NO_EXIT;
switch (opc) {
case 0x00:
/* CALL_PAL */
@@ -1384,7 +1458,8 @@ static inline int translate_one(DisasContext *ctx, uint32_t insn)
if (palcode >= 0x80 && palcode < 0xC0) {
/* Unprivileged PAL call */
gen_excp(ctx, EXCP_CALL_PAL + ((palcode & 0x3F) << 6), 0);
- ret = 3;
+ /* PC updated by gen_excp. */
+ ret = EXIT_PC_UPDATED;
break;
}
#ifndef CONFIG_USER_ONLY
@@ -2395,13 +2470,11 @@ static inline int translate_one(DisasContext *ctx, uint32_t insn)
switch ((uint16_t)disp16) {
case 0x0000:
/* TRAPB */
- /* No-op. Just exit from the current tb */
- ret = 2;
+ /* No-op. */
break;
case 0x0400:
/* EXCB */
- /* No-op. Just exit from the current tb */
- ret = 2;
+ /* No-op. */
break;
case 0x4000:
/* MB */
@@ -2465,21 +2538,7 @@ static inline int translate_one(DisasContext *ctx, uint32_t insn)
if (ra != 31)
tcg_gen_movi_i64(cpu_ir[ra], ctx->pc);
/* Those four jumps only differ by the branch prediction hint */
- switch (fn2) {
- case 0x0:
- /* JMP */
- break;
- case 0x1:
- /* JSR */
- break;
- case 0x2:
- /* RET */
- break;
- case 0x3:
- /* JSR_COROUTINE */
- break;
- }
- ret = 1;
+ ret = EXIT_PC_UPDATED;
break;
case 0x1B:
/* HW_LD (PALcode) */
@@ -2770,7 +2829,7 @@ static inline int translate_one(DisasContext *ctx, uint32_t insn)
tcg_temp_free(tmp2);
}
tcg_temp_free(tmp1);
- ret = 2;
+ ret = EXIT_PC_STALE;
}
break;
#endif
@@ -2795,7 +2854,7 @@ static inline int translate_one(DisasContext *ctx, uint32_t insn)
gen_helper_hw_ret(tmp);
tcg_temp_free(tmp);
}
- ret = 2;
+ ret = EXIT_PC_UPDATED;
break;
#endif
case 0x1F:
@@ -2956,85 +3015,66 @@ static inline int translate_one(DisasContext *ctx, uint32_t insn)
break;
case 0x30:
/* BR */
- if (ra != 31)
- tcg_gen_movi_i64(cpu_ir[ra], ctx->pc);
- tcg_gen_movi_i64(cpu_pc, ctx->pc + (int64_t)(disp21 << 2));
- ret = 1;
+ ret = gen_bdirect(ctx, ra, disp21);
break;
case 0x31: /* FBEQ */
- gen_fbcond(ctx, TCG_COND_EQ, ra, disp21);
- ret = 1;
+ ret = gen_fbcond(ctx, TCG_COND_EQ, ra, disp21);
break;
case 0x32: /* FBLT */
- gen_fbcond(ctx, TCG_COND_LT, ra, disp21);
- ret = 1;
+ ret = gen_fbcond(ctx, TCG_COND_LT, ra, disp21);
break;
case 0x33: /* FBLE */
- gen_fbcond(ctx, TCG_COND_LE, ra, disp21);
- ret = 1;
+ ret = gen_fbcond(ctx, TCG_COND_LE, ra, disp21);
break;
case 0x34:
/* BSR */
- if (ra != 31)
- tcg_gen_movi_i64(cpu_ir[ra], ctx->pc);
- tcg_gen_movi_i64(cpu_pc, ctx->pc + (int64_t)(disp21 << 2));
- ret = 1;
+ ret = gen_bdirect(ctx, ra, disp21);
break;
case 0x35: /* FBNE */
- gen_fbcond(ctx, TCG_COND_NE, ra, disp21);
- ret = 1;
+ ret = gen_fbcond(ctx, TCG_COND_NE, ra, disp21);
break;
case 0x36: /* FBGE */
- gen_fbcond(ctx, TCG_COND_GE, ra, disp21);
- ret = 1;
+ ret = gen_fbcond(ctx, TCG_COND_GE, ra, disp21);
break;
case 0x37: /* FBGT */
- gen_fbcond(ctx, TCG_COND_GT, ra, disp21);
- ret = 1;
+ ret = gen_fbcond(ctx, TCG_COND_GT, ra, disp21);
break;
case 0x38:
/* BLBC */
- gen_bcond(ctx, TCG_COND_EQ, ra, disp21, 1);
- ret = 1;
+ ret = gen_bcond(ctx, TCG_COND_EQ, ra, disp21, 1);
break;
case 0x39:
/* BEQ */
- gen_bcond(ctx, TCG_COND_EQ, ra, disp21, 0);
- ret = 1;
+ ret = gen_bcond(ctx, TCG_COND_EQ, ra, disp21, 0);
break;
case 0x3A:
/* BLT */
- gen_bcond(ctx, TCG_COND_LT, ra, disp21, 0);
- ret = 1;
+ ret = gen_bcond(ctx, TCG_COND_LT, ra, disp21, 0);
break;
case 0x3B:
/* BLE */
- gen_bcond(ctx, TCG_COND_LE, ra, disp21, 0);
- ret = 1;
+ ret = gen_bcond(ctx, TCG_COND_LE, ra, disp21, 0);
break;
case 0x3C:
/* BLBS */
- gen_bcond(ctx, TCG_COND_NE, ra, disp21, 1);
- ret = 1;
+ ret = gen_bcond(ctx, TCG_COND_NE, ra, disp21, 1);
break;
case 0x3D:
/* BNE */
- gen_bcond(ctx, TCG_COND_NE, ra, disp21, 0);
- ret = 1;
+ ret = gen_bcond(ctx, TCG_COND_NE, ra, disp21, 0);
break;
case 0x3E:
/* BGE */
- gen_bcond(ctx, TCG_COND_GE, ra, disp21, 0);
- ret = 1;
+ ret = gen_bcond(ctx, TCG_COND_GE, ra, disp21, 0);
break;
case 0x3F:
/* BGT */
- gen_bcond(ctx, TCG_COND_GT, ra, disp21, 0);
- ret = 1;
+ ret = gen_bcond(ctx, TCG_COND_GT, ra, disp21, 0);
break;
invalid_opc:
gen_invalid(ctx);
- ret = 3;
+ /* PC updated by gen_excp. */
+ ret = EXIT_PC_UPDATED;
break;
}
@@ -3051,15 +3091,17 @@ static inline void gen_intermediate_code_internal(CPUState *env,
uint16_t *gen_opc_end;
CPUBreakpoint *bp;
int j, lj = -1;
- int ret;
+ ExitStatus ret;
int num_insns;
int max_insns;
pc_start = tb->pc;
gen_opc_end = gen_opc_buf + OPC_MAX_SIZE;
+
+ ctx.tb = tb;
+ ctx.env = env;
ctx.pc = pc_start;
ctx.amask = env->amask;
- ctx.env = env;
#if defined (CONFIG_USER_ONLY)
ctx.mem_idx = 0;
#else
@@ -3083,7 +3125,7 @@ static inline void gen_intermediate_code_internal(CPUState *env,
max_insns = CF_COUNT_MASK;
gen_icount_start();
- for (ret = 0; ret == 0;) {
+ do {
if (unlikely(!QTAILQ_EMPTY(&env->breakpoints))) {
QTAILQ_FOREACH(bp, &env->breakpoints, entry) {
if (bp->pc == ctx.pc) {
@@ -3114,36 +3156,39 @@ static inline void gen_intermediate_code_internal(CPUState *env,
ctx.pc += 4;
ret = translate_one(ctxp, insn);
- if (ret != 0)
- break;
- /* if we reach a page boundary or are single stepping, stop
- * generation
- */
- if (env->singlestep_enabled) {
- gen_excp(&ctx, EXCP_DEBUG, 0);
- break;
- }
- if ((ctx.pc & (TARGET_PAGE_SIZE - 1)) == 0)
- break;
-
- if (gen_opc_ptr >= gen_opc_end)
- break;
-
- if (num_insns >= max_insns)
- break;
-
- if (singlestep) {
- break;
+ if (ret == NO_EXIT) {
+ /* If we reach a page boundary, are single stepping,
+ or exhaust instruction count, stop generation. */
+ if (env->singlestep_enabled) {
+ gen_excp(&ctx, EXCP_DEBUG, 0);
+ ret = EXIT_PC_UPDATED;
+ } else if ((ctx.pc & (TARGET_PAGE_SIZE - 1)) == 0
+ || gen_opc_ptr >= gen_opc_end
+ || num_insns >= max_insns
+ || singlestep) {
+ ret = EXIT_PC_STALE;
+ }
}
+ } while (ret == NO_EXIT);
+
+ if (tb->cflags & CF_LAST_IO) {
+ gen_io_end();
}
- if (ret != 1 && ret != 3) {
+
+ switch (ret) {
+ case EXIT_GOTO_TB:
+ break;
+ case EXIT_PC_STALE:
tcg_gen_movi_i64(cpu_pc, ctx.pc);
+ /* FALLTHRU */
+ case EXIT_PC_UPDATED:
+ tcg_gen_exit_tb(0);
+ break;
+ default:
+ abort();
}
- if (tb->cflags & CF_LAST_IO)
- gen_io_end();
- /* Generate the return instruction */
- tcg_gen_exit_tb(0);
+
gen_icount_end(tb, num_insns);
*gen_opc_ptr = INDEX_op_end;
if (search_pc) {
@@ -3155,6 +3200,7 @@ static inline void gen_intermediate_code_internal(CPUState *env,
tb->size = ctx.pc - pc_start;
tb->icount = num_insns;
}
+
#ifdef DEBUG_DISAS
if (qemu_loglevel_mask(CPU_LOG_TB_IN_ASM)) {
qemu_log("IN: %s\n", lookup_symbol(pc_start));
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-28 00:40:31 +0000