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target-alpha: Implement call_pal without an exception 

The destination of the call_pal, and the cpu state, is very predictable;
there's no need for exiting the cpu loop.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-07-26 11:22:21 -10:00
parent f202039811
commit ba96394e20
3 changed files with 35 additions and 3 deletions
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1
target-alpha/helper.h
View File

@ -99,6 +99,7 @@ DEF_HELPER_FLAGS_2(ieee_input_cmp, TCG_CALL_NO_WG, void, env, i64)
#if !defined (CONFIG_USER_ONLY)
DEF_HELPER_2(hw_ret, void, env, i64)
DEF_HELPER_3(call_pal, void, env, i64, i64)
DEF_HELPER_1(ldl_phys, i64, i64)
DEF_HELPER_1(ldq_phys, i64, i64)

12
target-alpha/sys_helper.c
View File

@ -51,6 +51,17 @@ void helper_hw_ret(CPUAlphaState *env, uint64_t a)
}
}
void helper_call_pal(CPUAlphaState *env, uint64_t pc, uint64_t entry_ofs)
{
int pal_mode = env->pal_mode;
env->exc_addr = pc | pal_mode;
env->pc = env->palbr + entry_ofs;
if (!pal_mode) {
env->pal_mode = 1;
swap_shadow_regs(env);
}
}
void helper_tbia(CPUAlphaState *env)
{
tlb_flush(env, 1);
@ -91,4 +102,5 @@ void helper_set_alarm(CPUAlphaState *env, uint64_t expire)
qemu_del_timer(cpu->alarm_timer);
}
}
#endif /* CONFIG_USER_ONLY */

25
target-alpha/translate.c
View File

@ -1521,7 +1521,8 @@ static ExitStatus gen_call_pal(DisasContext *ctx, int palcode)
tcg_gen_mov_i64(cpu_unique, cpu_ir[IR_A0]);
break;
default:
return gen_excp(ctx, EXCP_CALL_PAL, palcode & 0xbf);
palcode &= 0xbf;
goto do_call_pal;
}
return NO_EXIT;
}
@ -1586,13 +1587,31 @@ static ExitStatus gen_call_pal(DisasContext *ctx, int palcode)
break;
default:
return gen_excp(ctx, EXCP_CALL_PAL, palcode & 0x3f);
palcode &= 0x3f;
goto do_call_pal;
}
return NO_EXIT;
}
#endif
return gen_invalid(ctx);
do_call_pal:
#ifdef CONFIG_USER_ONLY
return gen_excp(ctx, EXCP_CALL_PAL, palcode);
#else
{
TCGv pc = tcg_const_i64(ctx->pc);
TCGv entry = tcg_const_i64(palcode & 0x80
? 0x2000 + (palcode - 0x80) * 64
: 0x1000 + palcode * 64);
gen_helper_call_pal(cpu_env, pc, entry);
tcg_temp_free(entry);
tcg_temp_free(pc);
return EXIT_PC_UPDATED;
}
#endif
}
#ifndef CONFIG_USER_ONLY