diff mbox series

[Stable-7.2.11,57/59] target/sh4: add missing CHECK_NOT_DELAY_SLOT

Message ID 20240418200224.952785-16-mjt@tls.msk.ru
State New
Headers show
Series Patch Round-up for stable 7.2.11, freeze on 2024-04-20 | expand

Commit Message

Michael Tokarev April 18, 2024, 8:02 p.m. UTC 
From: Zack Buhman <zack@buhman.org>

CHECK_NOT_DELAY_SLOT is correctly applied to the branch-related
instructions, but not to the PC-relative mov* instructions.

I verified the existence of an illegal slot exception on a SH7091 when
any of these instructions are attempted inside a delay slot.

This also matches the behavior described in the SH-4 ISA manual.

Signed-off-by: Zack Buhman <zack@buhman.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240407150705.5965-1-zack@buhman.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewd-by: Yoshinori Sato <ysato@users.sourceforge.jp>
(cherry picked from commit b754cb2dcde26a7bc8a9d17bb6900a0ac0dd38e2)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
(Mjt: trivial context (whitespace before comments) fixup)
diff mbox series

Patch

diff --git a/target/sh4/translate.c b/target/sh4/translate.c
index 7db3468b01..8d6eae7ddf 100644
--- a/target/sh4/translate.c
+++ b/target/sh4/translate.c
@@ -528,6 +528,7 @@  static void _decode_opc(DisasContext * ctx)
 	tcg_gen_movi_i32(REG(B11_8), B7_0s);
 	return;
     case 0x9000:		/* mov.w @(disp,PC),Rn */
+        CHECK_NOT_DELAY_SLOT
 	{
             TCGv addr = tcg_const_i32(ctx->base.pc_next + 4 + B7_0 * 2);
             tcg_gen_qemu_ld_i32(REG(B11_8), addr, ctx->memidx, MO_TESW);
@@ -535,6 +536,7 @@  static void _decode_opc(DisasContext * ctx)
 	}
 	return;
     case 0xd000:		/* mov.l @(disp,PC),Rn */
+        CHECK_NOT_DELAY_SLOT
 	{
             TCGv addr = tcg_const_i32((ctx->base.pc_next + 4 + B7_0 * 4) & ~3);
             tcg_gen_qemu_ld_i32(REG(B11_8), addr, ctx->memidx, MO_TESL);
@@ -1295,6 +1297,7 @@  static void _decode_opc(DisasContext * ctx)
 	}
 	return;
     case 0xc700:		/* mova @(disp,PC),R0 */
+        CHECK_NOT_DELAY_SLOT
         tcg_gen_movi_i32(REG(0), ((ctx->base.pc_next & 0xfffffffc) +
                                   4 + B7_0 * 4) & ~3);
 	return;