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Fix long-standing mips delay slot issue

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This commit is contained in:
mio
2025-02-19 17:39:24 +08:00
parent 8a2846369c
commit 56ba3476e5
6 changed files with 139 additions and 105 deletions
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12
qemu/tcg/tcg-op.c
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@@ -2866,9 +2866,17 @@ void check_exit_request(TCGContext *tcg_ctx)
tcg_gen_ld_i32(tcg_ctx, count, tcg_ctx->cpu_env,
offsetof(ArchCPU, neg.icount_decr.u32) -
offsetof(ArchCPU, env));
// Unicorn:
// We CANT'T use brcondi_i32 here or we will fail liveness analysis
// because it marks the end of BB
if (tcg_ctx->delay_slot_flag != NULL) {
TCGv_i32 tmp = tcg_const_i32(tcg_ctx, 0);
// dest = (c1 cond c2 ? v1 : v2)
tcg_gen_movcond_i32(tcg_ctx, TCG_COND_GT, count, tcg_ctx->delay_slot_flag, tmp, tcg_ctx->delay_slot_flag, count);
tcg_temp_free_i32(tcg_ctx, tmp);
}
tcg_gen_brcondi_i32(tcg_ctx, TCG_COND_LT, count, 0, tcg_ctx->exitreq_label);
tcg_temp_free_i32(tcg_ctx, count);
}