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[v2,2/6] target/ppc: Better CTRL SPR implementation

Message ID 20230327131218.2721044-2-npiggin@gmail.com
State New
Headers show
Series [v2,1/6] target/ppc: Fix width of some 32-bit SPRs | expand

Commit Message

Nicholas Piggin March 27, 2023, 1:12 p.m. UTC 
The CTRL register is able to write bit zero, and that is reflected in a
bit field in the register that reflects the state of all threads in the
core.

TCG does not implement SMT, so this just requires mirroring that bit into
the first bit of the thread state field.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 target/ppc/translate.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
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Patch

diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index 58fa509057..d699acb3d0 100644
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -413,7 +413,14 @@  void spr_write_generic(DisasContext *ctx, int sprn, int gprn)
 
 void spr_write_CTRL(DisasContext *ctx, int sprn, int gprn)
 {
-    spr_write_generic32(ctx, sprn, gprn);
+    /* This does not implement >1 thread */
+    TCGv t0 = tcg_temp_new();
+    TCGv t1 = tcg_temp_new();
+    tcg_gen_extract_tl(t0, cpu_gpr[gprn], 0, 1); /* Extract RUN field */
+    tcg_gen_shli_tl(t1, t0, 8); /* Duplicate the bit in TS */
+    tcg_gen_or_tl(t1, t1, t0);
+    gen_store_spr(sprn, t1);
+    spr_store_dump_spr(sprn);
 
     /*
      * SPR_CTRL writes must force a new translation block,