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armv7m: Report no-coprocessor faults correctly

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For v7M attempts to access a nonexistent coprocessor are reported
differently from plain undefined instructions (as UsageFaults of type
NOCP rather than type UNDEFINSTR). Split them out into a new
EXCP_NOCP so we can report the FSR value correctly.

Backports commit 7517748e3f71a3099e57915fba95c4c308e6d842 from qemu
This commit is contained in:
Peter Maydell 2018-03-02 13:47:08 -05:00 committed by Lioncash
parent eaa080e232
commit fce8138187
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2 changed files with 5 additions and 0 deletions
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1
qemu/target/arm/cpu.h
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@ -60,6 +60,7 @@
#define EXCP_VIRQ 14
#define EXCP_VFIQ 15
#define EXCP_SEMIHOST 16 /* semihosting call */
#define EXCP_NOCP 17 /* v7M NOCP UsageFault */
#define ARMV7M_EXCP_RESET 1
#define ARMV7M_EXCP_NMI 2

4
qemu/target/arm/helper.c
View file

@ -5445,6 +5445,10 @@ void arm_v7m_cpu_do_interrupt(CPUState *cs)
//armv7m_nvic_set_pending(env->nvic, ARMV7M_EXCP_USAGE);
env->v7m.cfsr |= R_V7M_CFSR_UNDEFINSTR_MASK;
return;
case EXCP_NOCP:
//armv7m_nvic_set_pending(env->nvic, ARMV7M_EXCP_USAGE);
env->v7m.cfsr |= R_V7M_CFSR_NOCP_MASK;
return;
case EXCP_SWI:
/* The PC already points to the next instruction. */
//armv7m_nvic_set_pending(env->nvic, ARMV7M_EXCP_SVC);