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From: matheus.ferst@eldorado.org.br
To: qemu-devel@nongnu.org, qemu-ppc@nongnu.org
Cc: richard.henderson@linaro.org, f4bug@amsat.org,
	luis.pires@eldorado.org.br, lagarcia@br.ibm.com,
	bruno.larsen@eldorado.org.br, matheus.ferst@eldorado.org.br,
	david@gibson.dropbear.id.au
Subject: [PATCH v4 12/31] target/ppc: Replace POWERPC_EXCP_BRANCH with DISAS_NORETURN
Date: Wed, 12 May 2021 15:54:22 -0300	[thread overview]
Message-ID: <20210512185441.3619828-13-matheus.ferst@eldorado.org.br> (raw)
In-Reply-To: <20210512185441.3619828-1-matheus.ferst@eldorado.org.br>

From: Richard Henderson <richard.henderson@linaro.org>

The translation of branch instructions always results in exit from
the TB.  Remove the synthetic "exception" after no more uses.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
---
 linux-user/ppc/cpu_loop.c | 3 ---
 target/ppc/cpu.h          | 2 --
 target/ppc/translate.c    | 8 ++------
 3 files changed, 2 insertions(+), 11 deletions(-)

diff --git a/linux-user/ppc/cpu_loop.c b/linux-user/ppc/cpu_loop.c
index fe526693d2..fa91ea0eed 100644
--- a/linux-user/ppc/cpu_loop.c
+++ b/linux-user/ppc/cpu_loop.c
@@ -423,9 +423,6 @@ void cpu_loop(CPUPPCState *env)
             cpu_abort(cs, "Maintenance exception while in user mode. "
                       "Aborting\n");
             break;
-        case POWERPC_EXCP_BRANCH:   /* branch instruction:                   */
-            /* We just stopped because of a branch. Go on */
-            break;
         case POWERPC_EXCP_SYSCALL_USER:
             /* system call in user-mode emulation */
             /* WARNING:
diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index 22456f9a72..1c3486e9d0 100644
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -131,8 +131,6 @@ enum {
     POWERPC_EXCP_SYSCALL_VECTORED = 102, /* scv exception                     */
     /* EOL                                                                   */
     POWERPC_EXCP_NB       = 103,
-    /* QEMU exceptions: used internally during code translation              */
-    POWERPC_EXCP_BRANCH       = 0x201, /* branch instruction                 */
     /* QEMU exceptions: special cases we want to stop translation            */
     POWERPC_EXCP_SYSCALL_USER = 0x203, /* System call in user mode only      */
 };
diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index db6f11d632..43320d2b8b 100644
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -4695,7 +4695,6 @@ static void gen_b(DisasContext *ctx)
 {
     target_ulong li, target;
 
-    ctx->exception = POWERPC_EXCP_BRANCH;
     /* sign extend LI */
     li = LI(ctx->opcode);
     li = (li ^ 0x02000000) - 0x02000000;
@@ -4709,6 +4708,7 @@ static void gen_b(DisasContext *ctx)
     }
     gen_update_cfar(ctx, ctx->cia);
     gen_goto_tb(ctx, 0, target);
+    ctx->base.is_jmp = DISAS_NORETURN;
 }
 
 #define BCOND_IM  0
@@ -4721,7 +4721,6 @@ static void gen_bcond(DisasContext *ctx, int type)
     uint32_t bo = BO(ctx->opcode);
     TCGLabel *l1;
     TCGv target;
-    ctx->exception = POWERPC_EXCP_BRANCH;
 
     if (type == BCOND_LR || type == BCOND_CTR || type == BCOND_TAR) {
         target = tcg_temp_local_new();
@@ -4828,6 +4827,7 @@ static void gen_bcond(DisasContext *ctx, int type)
         gen_set_label(l1);
         gen_goto_tb(ctx, 1, ctx->base.pc_next);
     }
+    ctx->base.is_jmp = DISAS_NORETURN;
 }
 
 static void gen_bc(DisasContext *ctx)
@@ -9293,7 +9293,6 @@ static void ppc_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs)
     /* Check trace mode exceptions */
     if (unlikely(ctx->singlestep_enabled & CPU_SINGLE_STEP &&
                  (ctx->base.pc_next <= 0x100 || ctx->base.pc_next > 0xF00) &&
-                 ctx->exception != POWERPC_EXCP_BRANCH &&
                  ctx->base.is_jmp != DISAS_NORETURN)) {
         uint32_t excp = gen_prep_dbgex(ctx);
         gen_exception_nip(ctx, excp, ctx->base.pc_next);
@@ -9309,9 +9308,6 @@ static void ppc_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs)
         switch (ctx->exception) {
         case POWERPC_EXCP_NONE:
             break;
-        case POWERPC_EXCP_BRANCH:
-            ctx->base.is_jmp = DISAS_NORETURN;
-            break;
         default:
             /* Every other ctx->exception should have set NORETURN. */
             g_assert_not_reached();
-- 
2.25.1



  parent reply	other threads:[~2021-05-12 19:13 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-12 18:54 [PATCH v4 00/31] Base for adding PowerPC 64-bit instructions matheus.ferst
2021-05-12 18:54 ` [PATCH v4 01/31] target/ppc: Add cia field to DisasContext matheus.ferst
2021-05-13  4:03   ` David Gibson
2021-05-12 18:54 ` [PATCH v4 02/31] target/ppc: Split out decode_legacy matheus.ferst
2021-05-13  4:03   ` David Gibson
2021-05-12 18:54 ` [PATCH v4 03/31] target/ppc: Move DISAS_NORETURN setting into gen_exception* matheus.ferst
2021-05-13  4:06   ` David Gibson
2021-05-12 18:54 ` [PATCH v4 04/31] target/ppc: Remove special case for POWERPC_SYSCALL matheus.ferst
2021-05-13  4:06   ` David Gibson
2021-05-12 18:54 ` [PATCH v4 05/31] target/ppc: Remove special case for POWERPC_EXCP_TRAP matheus.ferst
2021-05-13  4:07   ` David Gibson
2021-05-12 18:54 ` [PATCH v4 06/31] target/ppc: Simplify gen_debug_exception matheus.ferst
2021-05-13  4:08   ` David Gibson
2021-05-12 18:54 ` [PATCH v4 07/31] target/ppc: Introduce DISAS_{EXIT,CHAIN}{,_UPDATE} matheus.ferst
2021-05-13  4:10   ` David Gibson
2021-05-12 18:54 ` [PATCH v4 08/31] target/ppc: Replace POWERPC_EXCP_SYNC with DISAS_EXIT matheus.ferst
2021-05-12 19:31   ` Bruno Piazera Larsen
2021-05-13  4:11   ` David Gibson
2021-05-12 18:54 ` [PATCH v4 09/31] target/ppc: Remove unnecessary gen_io_end calls matheus.ferst
2021-05-13  4:12   ` David Gibson
2021-05-12 18:54 ` [PATCH v4 10/31] target/ppc: Introduce gen_icount_io_start matheus.ferst
2021-05-12 19:21   ` Matheus K. Ferst
2021-05-13  4:14     ` David Gibson
2021-05-12 18:54 ` [PATCH v4 11/31] target/ppc: Replace POWERPC_EXCP_STOP with DISAS_EXIT_UPDATE matheus.ferst
2021-05-12 18:54 ` matheus.ferst [this message]
2021-05-12 18:54 ` [PATCH v4 13/31] target/ppc: Remove DisasContext.exception matheus.ferst
2021-05-12 18:54 ` [PATCH v4 14/31] target/ppc: Move single-step check to ppc_tr_tb_stop matheus.ferst
2021-05-12 18:54 ` [PATCH v4 15/31] target/ppc: Tidy exception vs exit_tb matheus.ferst
2021-05-12 18:54 ` [PATCH v4 16/31] target/ppc: Mark helper_raise_exception* as noreturn matheus.ferst
2021-05-12 18:54 ` [PATCH v4 17/31] target/ppc: Use translator_loop_temp_check matheus.ferst
2021-05-12 19:45   ` Bruno Piazera Larsen
2021-05-12 18:54 ` [PATCH v4 18/31] target/ppc: Introduce macros to check isa extensions matheus.ferst
2021-05-12 18:54 ` [PATCH v4 19/31] target/ppc: Move page crossing check to ppc_tr_translate_insn matheus.ferst
2021-05-12 18:54 ` [PATCH v4 20/31] target/ppc: Add infrastructure for prefixed insns matheus.ferst
2021-05-12 18:54 ` [PATCH v4 21/31] target/ppc: Move ADDI, ADDIS to decodetree, implement PADDI matheus.ferst
2021-05-12 18:54 ` [PATCH v4 22/31] target/ppc: Implement PNOP matheus.ferst
2021-05-13 10:37   ` Richard Henderson
2021-05-12 18:54 ` [PATCH v4 23/31] TCG: add tcg_constant_tl matheus.ferst
2021-05-13 10:42   ` Richard Henderson
2021-05-12 18:54 ` [PATCH v4 24/31] target/ppc: Move D/DS/X-form integer loads to decodetree matheus.ferst
2021-05-12 18:54 ` [PATCH v4 25/31] target/ppc: Implement prefixed integer load instructions matheus.ferst
2021-05-13 10:50   ` Richard Henderson
2021-05-12 18:54 ` [PATCH v4 26/31] target/ppc: Move D/DS/X-form integer stores to decodetree matheus.ferst
2021-05-12 18:54 ` [PATCH v4 27/31] target/ppc: Implement prefixed integer store instructions matheus.ferst
2021-05-12 18:54 ` [PATCH v4 28/31] target/ppc: Implement setbc/setbcr/stnbc/setnbcr instructions matheus.ferst
2021-05-13 11:01   ` Richard Henderson
2021-05-13 11:43     ` Matheus K. Ferst
2021-05-12 18:54 ` [PATCH v4 29/31] target/ppc: Implement cfuged instruction matheus.ferst
2021-05-13 11:31   ` Richard Henderson
2021-05-13 12:24     ` Matheus K. Ferst
2021-05-14  0:01       ` Richard Henderson
2021-05-12 18:54 ` [PATCH v4 30/31] target/ppc: Implement vcfuged instruction matheus.ferst
2021-05-13 11:36   ` Richard Henderson
2021-05-12 18:54 ` [PATCH v4 31/31] target/ppc: Move addpcis to decodetree matheus.ferst
2021-05-13 11:40   ` Richard Henderson
2021-05-13  4:22 ` [PATCH v4 00/31] Base for adding PowerPC 64-bit instructions David Gibson

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