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target/arm: Create and use new function arm_v7m_is_handler_mode() 

Add a utility function for testing whether the CPU is in Handler
mode; this is just a check whether v7m.exception is non-zero, but
we do it in several places and it makes the code a bit easier
to read to not have to mentally figure out what the test is testing.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 1501692241-23310-14-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2017-09-04 15:21:53 +01:00
parent bd70b29ba9
commit 15b3f556ba
2 changed files with 12 additions and 6 deletions
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10
target/arm/cpu.h
View File

@ -1629,13 +1629,19 @@ static inline int arm_highest_el(CPUARMState *env)
return 1; return 1;
} }
/* Return true if a v7M CPU is in Handler mode */
static inline bool arm_v7m_is_handler_mode(CPUARMState *env)
{
return env->v7m.exception != 0;
}
/* Return the current Exception Level (as per ARMv8; note that this differs /* Return the current Exception Level (as per ARMv8; note that this differs
* from the ARMv7 Privilege Level). * from the ARMv7 Privilege Level).
*/ */
static inline int arm_current_el(CPUARMState *env) static inline int arm_current_el(CPUARMState *env)
{ {
if (arm_feature(env, ARM_FEATURE_M)) { if (arm_feature(env, ARM_FEATURE_M)) {
return !((env->v7m.exception == 0) && (env->v7m.control & 1)); return arm_v7m_is_handler_mode(env) || !(env->v7m.control & 1);
} }
if (is_a64(env)) { if (is_a64(env)) {
@ -2635,7 +2641,7 @@ static inline void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc,
} }
*flags |= fp_exception_el(env) << ARM_TBFLAG_FPEXC_EL_SHIFT; *flags |= fp_exception_el(env) << ARM_TBFLAG_FPEXC_EL_SHIFT;
if (env->v7m.exception != 0) { if (arm_v7m_is_handler_mode(env)) {
*flags |= ARM_TBFLAG_HANDLER_MASK; *flags |= ARM_TBFLAG_HANDLER_MASK;
} }

8
target/arm/helper.c
View File

@ -6142,7 +6142,7 @@ static void do_v7m_exception_exit(ARMCPU *cpu)
* that jumps to magic addresses don't have magic behaviour unless * that jumps to magic addresses don't have magic behaviour unless
* we're in Handler mode (compare pseudocode BXWritePC()). * we're in Handler mode (compare pseudocode BXWritePC()).
*/ */
assert(env->v7m.exception != 0); assert(arm_v7m_is_handler_mode(env));
/* In the spec pseudocode ExceptionReturn() is called directly /* In the spec pseudocode ExceptionReturn() is called directly
* from BXWritePC() and gets the full target PC value including * from BXWritePC() and gets the full target PC value including
@ -6249,7 +6249,7 @@ static void do_v7m_exception_exit(ARMCPU *cpu)
* resuming in Thread mode. If that doesn't match what the * resuming in Thread mode. If that doesn't match what the
* exception return type specified then this is a UsageFault. * exception return type specified then this is a UsageFault.
*/ */
if (return_to_handler == (env->v7m.exception == 0)) { if (return_to_handler != arm_v7m_is_handler_mode(env)) {
/* Take an INVPC UsageFault by pushing the stack again. */ /* Take an INVPC UsageFault by pushing the stack again. */
armv7m_nvic_set_pending(env->nvic, ARMV7M_EXCP_USAGE); armv7m_nvic_set_pending(env->nvic, ARMV7M_EXCP_USAGE);
env->v7m.cfsr |= R_V7M_CFSR_INVPC_MASK; env->v7m.cfsr |= R_V7M_CFSR_INVPC_MASK;
@ -6400,7 +6400,7 @@ void arm_v7m_cpu_do_interrupt(CPUState *cs)
if (env->v7m.control & R_V7M_CONTROL_SPSEL_MASK) { if (env->v7m.control & R_V7M_CONTROL_SPSEL_MASK) {
lr |= 4; lr |= 4;
} }
if (env->v7m.exception == 0) { if (!arm_v7m_is_handler_mode(env)) {
lr |= 8; lr |= 8;
} }
@ -8793,7 +8793,7 @@ void HELPER(v7m_msr)(CPUARMState *env, uint32_t maskreg, uint32_t val)
* switch_v7m_sp() deals with updating the SPSEL bit in * switch_v7m_sp() deals with updating the SPSEL bit in
* env->v7m.control, so we only need update the others. * env->v7m.control, so we only need update the others.
*/ */
if (env->v7m.exception == 0) { if (!arm_v7m_is_handler_mode(env)) {
switch_v7m_sp(env, (val & R_V7M_CONTROL_SPSEL_MASK) != 0); switch_v7m_sp(env, (val & R_V7M_CONTROL_SPSEL_MASK) != 0);
} }
env->v7m.control &= ~R_V7M_CONTROL_NPRIV_MASK; env->v7m.control &= ~R_V7M_CONTROL_NPRIV_MASK;