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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-05-30 16:52:07 +0200 |
|---|---|---|
| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-05-30 16:52:17 +0200 |
| commit | 9260319e7411ff8281700a532caa436f40120ec4 (patch) | |
| tree | 2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues_text/target_m68k/host_missing/accel_missing/2499 | |
| parent | 225caa38269323af1bfc2daadff5ec8bd930747f (diff) | |
| download | qemu-analysis-9260319e7411ff8281700a532caa436f40120ec4.tar.gz qemu-analysis-9260319e7411ff8281700a532caa436f40120ec4.zip | |
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Diffstat (limited to 'gitlab/issues_text/target_m68k/host_missing/accel_missing/2499')
| -rw-r--r-- | gitlab/issues_text/target_m68k/host_missing/accel_missing/2499 | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/gitlab/issues_text/target_m68k/host_missing/accel_missing/2499 b/gitlab/issues_text/target_m68k/host_missing/accel_missing/2499 new file mode 100644 index 000000000..19ff522d0 --- /dev/null +++ b/gitlab/issues_text/target_m68k/host_missing/accel_missing/2499 @@ -0,0 +1,30 @@ +m68k: fpu: fsave/frestore should be enabled for 68020/68030 +Description of problem: +valid 68020/68030 code can use `fsave`/`frestore` instructions to save/restore the state of an external 68881/68882 but currently QEMU only allows these instructions on 68040 and everyone else gets an f-line exception. + +I guess something like this to allow frestore/fsave. m68k programmers reference manual says they are 68881/68882/68040 and there don's seem to be any differences. + +``` diff +diff --git a/target/m68k/translate.c b/target/m68k/translate.c +index d5d2322329..92dc9d8563 100644 +--- a/target/m68k/translate.c ++++ b/target/m68k/translate.c +@@ -5455,7 +5455,7 @@ DISAS_INSN(frestore) + gen_exception(s, s->base.pc_next, EXCP_PRIVILEGE); + return; + } +- if (m68k_feature(s->env, M68K_FEATURE_M68040)) { ++ if (m68k_feature(s->env, M68K_FEATURE_FPU)) { + SRC_EA(env, addr, OS_LONG, 0, NULL); + /* FIXME: check the state frame */ + } else { +@@ -5472,7 +5472,7 @@ DISAS_INSN(fsave) + return; + } + +- if (m68k_feature(s->env, M68K_FEATURE_M68040)) { ++ if (m68k_feature(s->env, M68K_FEATURE_FPU)) { + /* always write IDLE */ + TCGv idle = tcg_constant_i32(0x41000000); + DEST_EA(env, insn, OS_LONG, idle, NULL); +``` |