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target-arm: Fix BASEPRI, BASEPRI_MAX, and FAULTMASK access 

Correct the decode of the register numbers for BASEPRI, BASEPRI_MAX
and FAULTMASK, according to "ARMv7-M Architecture Reference Manual"
issue D section "B5.2.3 MRS" and "B5.2.3 MSR".

Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Sebastian Huber 2011-05-29 02:58:41 +00:00 committed by Peter Maydell
parent 74594c9d81
commit 82845826e8
1 changed files with 13 additions and 13 deletions
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26
target-arm/helper.c
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@ -2128,11 +2128,11 @@ uint32_t HELPER(v7m_mrs)(CPUState *env, uint32_t reg)
return env->v7m.current_sp ? env->regs[13] : env->v7m.other_sp;
case 16: /* PRIMASK */
return (env->uncached_cpsr & CPSR_I) != 0;
case 17: /* FAULTMASK */
return (env->uncached_cpsr & CPSR_F) != 0;
case 18: /* BASEPRI */
case 19: /* BASEPRI_MAX */
case 17: /* BASEPRI */
case 18: /* BASEPRI_MAX */
return env->v7m.basepri;
case 19: /* FAULTMASK */
return (env->uncached_cpsr & CPSR_F) != 0;
case 20: /* CONTROL */
return env->v7m.control;
default:
@ -2184,20 +2184,20 @@ void HELPER(v7m_msr)(CPUState *env, uint32_t reg, uint32_t val)
else
env->uncached_cpsr &= ~CPSR_I;
break;
case 17: /* FAULTMASK */
case 17: /* BASEPRI */
env->v7m.basepri = val & 0xff;
break;
case 18: /* BASEPRI_MAX */
val &= 0xff;
if (val != 0 && (val < env->v7m.basepri || env->v7m.basepri == 0))
env->v7m.basepri = val;
break;
case 19: /* FAULTMASK */
if (val & 1)
env->uncached_cpsr |= CPSR_F;
else
env->uncached_cpsr &= ~CPSR_F;
break;
case 18: /* BASEPRI */
env->v7m.basepri = val & 0xff;
break;
case 19: /* BASEPRI_MAX */
val &= 0xff;
if (val != 0 && (val < env->v7m.basepri || env->v7m.basepri == 0))
env->v7m.basepri = val;
break;
case 20: /* CONTROL */
env->v7m.control = val & 3;
switch_v7m_sp(env, (val & 2) != 0);