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| author | Richard Henderson <rth@twiddle.net> | 2011-05-20 13:21:15 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@anchor.twiddle.net> | 2011-05-31 10:18:05 -0700 |
| commit | 508b43eaf3dd179363557bf68e911ddea637e58b (patch) | |
| tree | 7b2c22681c515dc0a57f0179e61f14e11aefa661 /target-alpha | |
| parent | 8417845ee9dbb2881409bac75365099d17d1cc3d (diff) | |
| download | qemu-508b43eaf3dd179363557bf68e911ddea637e58b.zip qemu-508b43eaf3dd179363557bf68e911ddea637e58b.tar.gz qemu-508b43eaf3dd179363557bf68e911ddea637e58b.tar.bz2 | |
target-alpha: Merge HW_REI and HW_RET implementations.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'target-alpha')
| -rw-r--r-- | target-alpha/helper.h | 1 | ||||
| -rw-r--r-- | target-alpha/op_helper.c | 10 | ||||
| -rw-r--r-- | target-alpha/translate.c | 19 |
3 files changed, 8 insertions, 22 deletions
diff --git a/target-alpha/helper.h b/target-alpha/helper.h index f4f693a..de86ff2 100644 --- a/target-alpha/helper.h +++ b/target-alpha/helper.h @@ -100,7 +100,6 @@ DEF_HELPER_1(ieee_input_cmp, i64, i64) DEF_HELPER_1(ieee_input_s, i64, i64) #if !defined (CONFIG_USER_ONLY) -DEF_HELPER_0(hw_rei, void) DEF_HELPER_1(hw_ret, void, i64) DEF_HELPER_2(mfpr, i64, int, i64) DEF_HELPER_2(mtpr, void, int, i64) diff --git a/target-alpha/op_helper.c b/target-alpha/op_helper.c index a90c7a6..ea11cd2 100644 --- a/target-alpha/op_helper.c +++ b/target-alpha/op_helper.c @@ -1156,22 +1156,12 @@ uint64_t helper_cvtqg (uint64_t a) /* PALcode support special instructions */ #if !defined (CONFIG_USER_ONLY) -void helper_hw_rei (void) -{ - env->pc = env->ipr[IPR_EXC_ADDR] & ~3; - env->ipr[IPR_EXC_ADDR] = env->ipr[IPR_EXC_ADDR] & 1; - env->intr_flag = 0; - env->lock_addr = -1; - /* XXX: re-enable interrupts and memory mapping */ -} - void helper_hw_ret (uint64_t a) { env->pc = a & ~3; env->ipr[IPR_EXC_ADDR] = a & 1; env->intr_flag = 0; env->lock_addr = -1; - /* XXX: re-enable interrupts and memory mapping */ } uint64_t helper_mfpr (int iprn, uint64_t val) diff --git a/target-alpha/translate.c b/target-alpha/translate.c index 2c0b9c2..2559814 100644 --- a/target-alpha/translate.c +++ b/target-alpha/translate.c @@ -2876,25 +2876,22 @@ static ExitStatus translate_one(DisasContext *ctx, uint32_t insn) break; #endif case 0x1E: - /* HW_REI (PALcode) */ + /* HW_RET (PALcode) */ #if defined (CONFIG_USER_ONLY) goto invalid_opc; #else if (!ctx->pal_mode) goto invalid_opc; if (rb == 31) { - /* "Old" alpha */ - gen_helper_hw_rei(); - } else { - TCGv tmp; - - if (ra != 31) { - tmp = tcg_temp_new(); - tcg_gen_addi_i64(tmp, cpu_ir[rb], (((int64_t)insn << 51) >> 51)); - } else - tmp = tcg_const_i64(((int64_t)insn << 51) >> 51); + /* Pre-EV6 CPUs interpreted this as HW_REI, loading the return + address from EXC_ADDR. This turns out to be useful for our + emulation PALcode, so continue to accept it. */ + TCGv tmp = tcg_temp_new(); + tcg_gen_ld_i64(tmp, cpu_env, offsetof(CPUState, ipr[IPR_EXC_ADDR])); gen_helper_hw_ret(tmp); tcg_temp_free(tmp); + } else { + gen_helper_hw_ret(cpu_ir[rb]); } ret = EXIT_PC_UPDATED; break; |