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target/arm: Move v7m_using_psp() to internals.h

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We're going to want v7m_using_psp() in op_helper.c in the
next patch, so move it from helper.c to internals.h.

Backports commit 5529bf188d996391ff52a0e1801daf9c6a6bfcb0 from qemu
This commit is contained in:
Peter Maydell 2018-10-08 13:50:21 -04:00 committed by Lioncash
parent ae4900fba2
commit b2146058c3
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2 changed files with 16 additions and 12 deletions
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12
qemu/target/arm/helper.c
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@ -5769,18 +5769,6 @@ pend_fault:
return false;
}
/* Return true if we're using the process stack pointer (not the MSP) */
static bool v7m_using_psp(CPUARMState *env)
{
/* Handler mode always uses the main stack; for thread mode
* the CONTROL.SPSEL bit determines the answer.
* Note that in v7M it is not possible to be in Handler mode with
* CONTROL.SPSEL non-zero, but in v8M it is, so we must check both.
*/
return !arm_v7m_is_handler_mode(env) &&
env->v7m.control[env->v7m.secure] & R_V7M_CONTROL_SPSEL_MASK;
}
/* Write to v7M CONTROL.SPSEL bit for the specified security bank.
* This may change the current stack pointer between Main and Process
* stack pointers if it is done for the CONTROL register for the current

16
qemu/target/arm/internals.h
View file

@ -803,4 +803,20 @@ static inline uint32_t arm_debug_exception_fsr(CPUARMState *env)
*/
#define MEMOPIDX_SHIFT 8
/**
* v7m_using_psp: Return true if using process stack pointer
* Return true if the CPU is currently using the process stack
* pointer, or false if it is using the main stack pointer.
*/
static inline bool v7m_using_psp(CPUARMState *env)
{
/* Handler mode always uses the main stack; for thread mode
* the CONTROL.SPSEL bit determines the answer.
* Note that in v7M it is not possible to be in Handler mode with
* CONTROL.SPSEL non-zero, but in v8M it is, so we must check both.
*/
return !arm_v7m_is_handler_mode(env) &&
env->v7m.control[env->v7m.secure] & R_V7M_CONTROL_SPSEL_MASK;
}
#endif