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target-arm: refactor cp15.c13 register access 

Access the cp15.c13 TLS registers directly with TCG ops instead of with
a slow helper. If the the cp15 read/write was not TLS register access,
fall back to the cp15 helper.

This makes accessing __thread variables in linux-user when apps are compiled
with -mtp=cp15 possible. legal cp15 register to acces from linux-user are
already checked in cp15_user_ok.

While at it, make the cp15.c13 Thread ID registers available only on
ARMv6K and newer.

Signed-off-by: Riku Voipio <riku.voipio@nokia.com>
This commit is contained in:
Riku Voipio 2010-01-25 15:17:32 +02:00 committed by Aurelien Jarno
parent fd052bf63a
commit 3f26c1227e
2 changed files with 55 additions and 16 deletions
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16
target-arm/helper.c
View File

@ -511,7 +511,6 @@ void HELPER(set_cp15)(CPUState *env, uint32_t insn, uint32_t val)
uint32_t HELPER(get_cp15)(CPUState *env, uint32_t insn)
{
cpu_abort(env, "cp15 insn %08x\n", insn);
return 0;
}
/* These should probably raise undefined insn exceptions. */
@ -1491,15 +1490,6 @@ void HELPER(set_cp15)(CPUState *env, uint32_t insn, uint32_t val)
tlb_flush(env, 0);
env->cp15.c13_context = val;
break;
case 2:
env->cp15.c13_tls1 = val;
break;
case 3:
env->cp15.c13_tls2 = val;
break;
case 4:
env->cp15.c13_tls3 = val;
break;
default:
goto bad_reg;
}
@ -1779,12 +1769,6 @@ uint32_t HELPER(get_cp15)(CPUState *env, uint32_t insn)
return env->cp15.c13_fcse;
case 1:
return env->cp15.c13_context;
case 2:
return env->cp15.c13_tls1;
case 3:
return env->cp15.c13_tls2;
case 4:
return env->cp15.c13_tls3;
default:
goto bad_reg;
}

55
target-arm/translate.c
View File

@ -2455,6 +2455,57 @@ static int cp15_user_ok(uint32_t insn)
return 0;
}
static int cp15_tls_load_store(CPUState *env, DisasContext *s, uint32_t insn, uint32_t rd)
{
TCGv tmp;
int cpn = (insn >> 16) & 0xf;
int cpm = insn & 0xf;
int op = ((insn >> 5) & 7) | ((insn >> 18) & 0x38);
if (!arm_feature(env, ARM_FEATURE_V6K))
return 0;
if (!(cpn == 13 && cpm == 0))
return 0;
if (insn & ARM_CP_RW_BIT) {
tmp = new_tmp();
switch (op) {
case 2:
tcg_gen_ld_i32(tmp, cpu_env, offsetof(CPUARMState, cp15.c13_tls1));
break;
case 3:
tcg_gen_ld_i32(tmp, cpu_env, offsetof(CPUARMState, cp15.c13_tls2));
break;
case 4:
tcg_gen_ld_i32(tmp, cpu_env, offsetof(CPUARMState, cp15.c13_tls3));
break;
default:
dead_tmp(tmp);
return 0;
}
store_reg(s, rd, tmp);
} else {
tmp = load_reg(s, rd);
switch (op) {
case 2:
tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUARMState, cp15.c13_tls1));
break;
case 3:
tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUARMState, cp15.c13_tls2));
break;
case 4:
tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUARMState, cp15.c13_tls3));
break;
default:
return 0;
}
dead_tmp(tmp);
}
return 1;
}
/* Disassemble system coprocessor (cp15) instruction. Return nonzero if
instruction is not defined. */
static int disas_cp15_insn(CPUState *env, DisasContext *s, uint32_t insn)
@ -2489,6 +2540,10 @@ static int disas_cp15_insn(CPUState *env, DisasContext *s, uint32_t insn)
return 0;
}
rd = (insn >> 12) & 0xf;
if (cp15_tls_load_store(env, s, insn, rd))
return 0;
tmp2 = tcg_const_i32(insn);
if (insn & ARM_CP_RW_BIT) {
tmp = new_tmp();