Differential D13931 Diff 38519 head/sys/arm/arm/trap-v6.c

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head/sys/arm/arm/trap-v6.c

Show First 20 Lines • Show All 281 Lines • ▼ Show 20 Lines	abort_handler(struct trapframe *tf, int prefetch)
uint32_t fsr;		uint32_t fsr;
struct ksig ksig;		struct ksig ksig;
struct proc *p;		struct proc *p;
struct pcb *pcb;		struct pcb *pcb;
struct vm_map *map;		struct vm_map *map;
struct vmspace *vm;		struct vmspace *vm;
vm_prot_t ftype;		vm_prot_t ftype;
bool usermode;		bool usermode;
		int bp_harden;
#ifdef INVARIANTS		#ifdef INVARIANTS
void *onfault;		void *onfault;
#endif		#endif

VM_CNT_INC(v_trap);		VM_CNT_INC(v_trap);
td = curthread;		td = curthread;

fsr = (prefetch) ? cp15_ifsr_get(): cp15_dfsr_get();		fsr = (prefetch) ? cp15_ifsr_get(): cp15_dfsr_get();
#if __ARM_ARCH >= 7		#if __ARM_ARCH >= 7
far = (prefetch) ? cp15_ifar_get() : cp15_dfar_get();		far = (prefetch) ? cp15_ifar_get() : cp15_dfar_get();
#else		#else
far = (prefetch) ? TRAPF_PC(tf) : cp15_dfar_get();		far = (prefetch) ? TRAPF_PC(tf) : cp15_dfar_get();
#endif		#endif

idx = FSR_TO_FAULT(fsr);		idx = FSR_TO_FAULT(fsr);
usermode = TRAPF_USERMODE(tf); /* Abort came from user mode? */		usermode = TRAPF_USERMODE(tf); /* Abort came from user mode? */

		/*
		* Apply BP hardening by flushing the branch prediction cache
		* for prefaults on kernel addresses.
		*/
		if (__predict_false(prefetch && far > VM_MAXUSER_ADDRESS &&
		(idx == FAULT_TRAN_L2 \|\| idx == FAULT_PERM_L2))) {
		bp_harden = PCPU_GET(bp_harden_kind);
		if (bp_harden == PCPU_BP_HARDEN_KIND_BPIALL)
		_CP15_BPIALL();
		else if (bp_harden == PCPU_BP_HARDEN_KIND_ICIALLU)
		_CP15_ICIALLU();
		}

if (usermode)		if (usermode)
td->td_frame = tf;		td->td_frame = tf;

CTR6(KTR_TRAP, "%s: fsr %#x (idx %u) far %#x prefetch %u usermode %d",		CTR6(KTR_TRAP, "%s: fsr %#x (idx %u) far %#x prefetch %u usermode %d",
__func__, fsr, idx, far, prefetch, usermode);		__func__, fsr, idx, far, prefetch, usermode);

/*		/*
* Firstly, handle aborts that are not directly related to mapping.		* Firstly, handle aborts that are not directly related to mapping.
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