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target/alpha: Convert to DisasJumpType

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Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2017-07-14 13:17:03 -10:00 committed by Richard Henderson
parent cda4a338c4
commit 3de811c6fd
1 changed files with 55 additions and 77 deletions
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132
target/alpha/translate.c
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@ -25,11 +25,10 @@
#include "exec/exec-all.h"
#include "tcg-op.h"
#include "exec/cpu_ldst.h"
#include "exec/helper-proto.h"
#include "exec/helper-gen.h"
#include "trace-tcg.h"
#include "exec/translator.h"
#include "exec/log.h"
@ -73,32 +72,12 @@ struct DisasContext {
bool singlestep_enabled;
};
/* 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,
EXIT_PC_UPDATED_NOCHAIN,
/* 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,
/* We are exiting the TB due to page crossing or space constraints. */
EXIT_FALLTHRU,
/* We are ending the TB with a noreturn function call, e.g. longjmp.
No following code will be executed. */
EXIT_NORETURN,
} ExitStatus;
/* Target-specific return values from translate_one, indicating the
state of the TB. Note that DISAS_NEXT indicates that we are not
exiting the TB. */
#define DISAS_PC_UPDATED_NOCHAIN DISAS_TARGET_0
#define DISAS_PC_UPDATED DISAS_TARGET_1
#define DISAS_PC_STALE DISAS_TARGET_2
/* global register indexes */
static TCGv_env cpu_env;
@ -301,14 +280,14 @@ static void gen_excp_1(int exception, int error_code)
tcg_temp_free_i32(tmp1);
}
static ExitStatus gen_excp(DisasContext *ctx, int exception, int error_code)
static DisasJumpType gen_excp(DisasContext *ctx, int exception, int error_code)
{
tcg_gen_movi_i64(cpu_pc, ctx->pc);
gen_excp_1(exception, error_code);
return EXIT_NORETURN;
return DISAS_NORETURN;
}
static inline ExitStatus gen_invalid(DisasContext *ctx)
static inline DisasJumpType gen_invalid(DisasContext *ctx)
{
return gen_excp(ctx, EXCP_OPCDEC, 0);
}
@ -434,9 +413,9 @@ static inline void gen_store_mem(DisasContext *ctx,
tcg_temp_free(tmp);
}
static ExitStatus gen_store_conditional(DisasContext *ctx, int ra, int rb,
int32_t disp16, int mem_idx,
TCGMemOp op)
static DisasJumpType gen_store_conditional(DisasContext *ctx, int ra, int rb,
int32_t disp16, int mem_idx,
TCGMemOp op)
{
TCGLabel *lab_fail, *lab_done;
TCGv addr, val;
@ -468,7 +447,7 @@ static ExitStatus gen_store_conditional(DisasContext *ctx, int ra, int rb,
gen_set_label(lab_done);
tcg_gen_movi_i64(cpu_lock_addr, -1);
return NO_EXIT;
return DISAS_NEXT;
}
static bool in_superpage(DisasContext *ctx, int64_t addr)
@ -507,7 +486,7 @@ static bool use_goto_tb(DisasContext *ctx, uint64_t dest)
#endif
}
static ExitStatus gen_bdirect(DisasContext *ctx, int ra, int32_t disp)
static DisasJumpType gen_bdirect(DisasContext *ctx, int ra, int32_t disp)
{
uint64_t dest = ctx->pc + (disp << 2);
@ -522,15 +501,15 @@ static ExitStatus gen_bdirect(DisasContext *ctx, int ra, int32_t disp)
tcg_gen_goto_tb(0);
tcg_gen_movi_i64(cpu_pc, dest);
tcg_gen_exit_tb((uintptr_t)ctx->tb);
return EXIT_GOTO_TB;
return DISAS_NORETURN;
} else {
tcg_gen_movi_i64(cpu_pc, dest);
return EXIT_PC_UPDATED;
return DISAS_PC_UPDATED;
}
}
static ExitStatus gen_bcond_internal(DisasContext *ctx, TCGCond cond,
TCGv cmp, int32_t disp)
static DisasJumpType gen_bcond_internal(DisasContext *ctx, TCGCond cond,
TCGv cmp, int32_t disp)
{
uint64_t dest = ctx->pc + (disp << 2);
TCGLabel *lab_true = gen_new_label();
@ -547,7 +526,7 @@ static ExitStatus gen_bcond_internal(DisasContext *ctx, TCGCond cond,
tcg_gen_movi_i64(cpu_pc, dest);
tcg_gen_exit_tb((uintptr_t)ctx->tb + 1);
return EXIT_GOTO_TB;
return DISAS_NORETURN;
} else {
TCGv_i64 z = tcg_const_i64(0);
TCGv_i64 d = tcg_const_i64(dest);
@ -558,16 +537,16 @@ static ExitStatus gen_bcond_internal(DisasContext *ctx, TCGCond cond,
tcg_temp_free_i64(z);
tcg_temp_free_i64(d);
tcg_temp_free_i64(p);
return EXIT_PC_UPDATED;
return DISAS_PC_UPDATED;
}
}
static ExitStatus gen_bcond(DisasContext *ctx, TCGCond cond, int ra,
int32_t disp, int mask)
static DisasJumpType gen_bcond(DisasContext *ctx, TCGCond cond, int ra,
int32_t disp, int mask)
{
if (mask) {
TCGv tmp = tcg_temp_new();
ExitStatus ret;
DisasJumpType ret;
tcg_gen_andi_i64(tmp, load_gpr(ctx, ra), 1);
ret = gen_bcond_internal(ctx, cond, tmp, disp);
@ -609,11 +588,11 @@ static void gen_fold_mzero(TCGCond cond, TCGv dest, TCGv src)
}
}
static ExitStatus gen_fbcond(DisasContext *ctx, TCGCond cond, int ra,
int32_t disp)
static DisasJumpType gen_fbcond(DisasContext *ctx, TCGCond cond, int ra,
int32_t disp)
{
TCGv cmp_tmp = tcg_temp_new();
ExitStatus ret;
DisasJumpType ret;
gen_fold_mzero(cond, cmp_tmp, load_fpr(ctx, ra));
ret = gen_bcond_internal(ctx, cond, cmp_tmp, disp);
@ -1159,7 +1138,7 @@ static void gen_rx(DisasContext *ctx, int ra, int set)
tcg_temp_free(tmp);
}
static ExitStatus gen_call_pal(DisasContext *ctx, int palcode)
static DisasJumpType gen_call_pal(DisasContext *ctx, int palcode)
{
/* We're emulating OSF/1 PALcode. Many of these are trivial access
to internal cpu registers. */
@ -1185,7 +1164,7 @@ static ExitStatus gen_call_pal(DisasContext *ctx, int palcode)
palcode &= 0xbf;
goto do_call_pal;
}
return NO_EXIT;
return DISAS_NEXT;
}
#ifndef CONFIG_USER_ONLY
@ -1232,7 +1211,7 @@ static ExitStatus gen_call_pal(DisasContext *ctx, int palcode)
/* Allow interrupts to be recognized right away. */
tcg_gen_movi_i64(cpu_pc, ctx->pc);
return EXIT_PC_UPDATED_NOCHAIN;
return DISAS_PC_UPDATED_NOCHAIN;
case 0x36:
/* RDPS */
@ -1270,7 +1249,7 @@ static ExitStatus gen_call_pal(DisasContext *ctx, int palcode)
palcode &= 0x3f;
goto do_call_pal;
}
return NO_EXIT;
return DISAS_NEXT;
}
#endif
return gen_invalid(ctx);
@ -1307,10 +1286,10 @@ static ExitStatus gen_call_pal(DisasContext *ctx, int palcode)
tcg_gen_goto_tb(0);
tcg_gen_movi_i64(cpu_pc, entry);
tcg_gen_exit_tb((uintptr_t)ctx->tb);
return EXIT_GOTO_TB;
return DISAS_NORETURN;
} else {
tcg_gen_movi_i64(cpu_pc, entry);
return EXIT_PC_UPDATED;
return DISAS_PC_UPDATED;
}
}
#endif
@ -1344,7 +1323,7 @@ static int cpu_pr_data(int pr)
return 0;
}
static ExitStatus gen_mfpr(DisasContext *ctx, TCGv va, int regno)
static DisasJumpType gen_mfpr(DisasContext *ctx, TCGv va, int regno)
{
void (*helper)(TCGv);
int data;
@ -1366,7 +1345,7 @@ static ExitStatus gen_mfpr(DisasContext *ctx, TCGv va, int regno)
gen_io_start();
helper(va);
gen_io_end();
return EXIT_PC_STALE;
return DISAS_PC_STALE;
} else {
helper(va);
}
@ -1393,10 +1372,10 @@ static ExitStatus gen_mfpr(DisasContext *ctx, TCGv va, int regno)
break;
}
return NO_EXIT;
return DISAS_NEXT;
}
static ExitStatus gen_mtpr(DisasContext *ctx, TCGv vb, int regno)
static DisasJumpType gen_mtpr(DisasContext *ctx, TCGv vb, int regno)
{
int data;
@ -1424,7 +1403,7 @@ static ExitStatus gen_mtpr(DisasContext *ctx, TCGv vb, int regno)
case 252:
/* HALT */
gen_helper_halt(vb);
return EXIT_PC_STALE;
return DISAS_PC_STALE;
case 251:
/* ALARM */
@ -1438,7 +1417,7 @@ static ExitStatus gen_mtpr(DisasContext *ctx, TCGv vb, int regno)
that ended with a CALL_PAL. Since the base register usually only
changes during boot, flushing everything works well. */
gen_helper_tb_flush(cpu_env);
return EXIT_PC_STALE;
return DISAS_PC_STALE;
case 32 ... 39:
/* Accessing the "non-shadow" general registers. */
@ -1467,7 +1446,7 @@ static ExitStatus gen_mtpr(DisasContext *ctx, TCGv vb, int regno)
break;
}
return NO_EXIT;
return DISAS_NEXT;
}
#endif /* !USER_ONLY*/
@ -1499,7 +1478,7 @@ static ExitStatus gen_mtpr(DisasContext *ctx, TCGv vb, int regno)
} \
} while (0)
static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
static DisasJumpType translate_one(DisasContext *ctx, uint32_t insn)
{
int32_t disp21, disp16, disp12 __attribute__((unused));
uint16_t fn11;
@ -1507,7 +1486,7 @@ static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
bool islit, real_islit;
TCGv va, vb, vc, tmp, tmp2;
TCGv_i32 t32;
ExitStatus ret;
DisasJumpType ret;
/* Decode all instruction fields */
opc = extract32(insn, 26, 6);
@ -1530,7 +1509,7 @@ static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
lit = 0;
}
ret = NO_EXIT;
ret = DISAS_NEXT;
switch (opc) {
case 0x00:
/* CALL_PAL */
@ -2432,7 +2411,7 @@ static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
gen_io_start();
gen_helper_load_pcc(va, cpu_env);
gen_io_end();
ret = EXIT_PC_STALE;
ret = DISAS_PC_STALE;
} else {
gen_helper_load_pcc(va, cpu_env);
}
@ -2480,7 +2459,7 @@ static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
if (ra != 31) {
tcg_gen_movi_i64(ctx->ir[ra], ctx->pc);
}
ret = EXIT_PC_UPDATED;
ret = DISAS_PC_UPDATED;
break;
case 0x1B:
@ -2738,7 +2717,7 @@ static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
tcg_temp_free(tmp);
tcg_gen_andi_i64(cpu_pc, vb, ~3);
/* Allow interrupts to be recognized right away. */
ret = EXIT_PC_UPDATED_NOCHAIN;
ret = DISAS_PC_UPDATED_NOCHAIN;
break;
#else
goto invalid_opc;
@ -2959,7 +2938,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb)
target_ulong pc_start;
target_ulong pc_mask;
uint32_t insn;
ExitStatus ret;
DisasJumpType ret;
int num_insns;
int max_insns;
@ -3040,41 +3019,40 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb)
/* If we reach a page boundary, are single stepping,
or exhaust instruction count, stop generation. */
if (ret == NO_EXIT
if (ret == DISAS_NEXT
&& ((ctx.pc & pc_mask) == 0
|| tcg_op_buf_full()
|| num_insns >= max_insns
|| singlestep
|| ctx.singlestep_enabled)) {
ret = EXIT_FALLTHRU;
ret = DISAS_TOO_MANY;
}
} while (ret == NO_EXIT);
} while (ret == DISAS_NEXT);
if (tb->cflags & CF_LAST_IO) {
gen_io_end();
}
switch (ret) {
case EXIT_GOTO_TB:
case EXIT_NORETURN:
case DISAS_NORETURN:
break;
case EXIT_FALLTHRU:
case DISAS_TOO_MANY:
if (use_goto_tb(&ctx, ctx.pc)) {
tcg_gen_goto_tb(0);
tcg_gen_movi_i64(cpu_pc, ctx.pc);
tcg_gen_exit_tb((uintptr_t)ctx.tb);
}
/* FALLTHRU */
case EXIT_PC_STALE:
case DISAS_PC_STALE:
tcg_gen_movi_i64(cpu_pc, ctx.pc);
/* FALLTHRU */
case EXIT_PC_UPDATED:
case DISAS_PC_UPDATED:
if (!use_exit_tb(&ctx)) {
tcg_gen_lookup_and_goto_ptr(cpu_pc);
break;
}
/* FALLTHRU */
case EXIT_PC_UPDATED_NOCHAIN:
case DISAS_PC_UPDATED_NOCHAIN:
if (ctx.singlestep_enabled) {
gen_excp_1(EXCP_DEBUG, 0);
} else {