microblaze_mmu_v2: Add MMU related exceptions handling (4bb73c3d) · Commits · e / devices / android_kernel_xiaomi_markw

arch/microblaze/kernel/exceptions.c

+37 −8

Original line number	Diff line number	Diff line
		@@ -21,9 +21,9 @@

		#include <asm/exceptions.h>
		#include <asm/entry.h> /* For KM CPU var */
		#include <asm/uaccess.h>
		#include <asm/errno.h>
		#include <asm/ptrace.h>
		#include <linux/uaccess.h>
		#include <linux/errno.h>
		#include <linux/ptrace.h>
		#include <asm/current.h>

		#define MICROBLAZE_ILL_OPCODE_EXCEPTION 0x02
		@@ -31,7 +31,7 @@
		#define MICROBLAZE_DBUS_EXCEPTION 0x04
		#define MICROBLAZE_DIV_ZERO_EXCEPTION 0x05
		#define MICROBLAZE_FPU_EXCEPTION 0x06
		#define MICROBLAZE_PRIVILEG_EXCEPTION 0x07
		#define MICROBLAZE_PRIVILEGED_EXCEPTION 0x07

		static DEFINE_SPINLOCK(die_lock);

		@@ -66,6 +66,11 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
		asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
		int fsr, int addr)
		{
		#ifdef CONFIG_MMU
		int code;
		addr = regs->pc;
		#endif

		#if 0
		printk(KERN_WARNING "Exception %02x in %s mode, FSR=%08x PC=%08x ESR=%08x\n",
		type, user_mode(regs) ? "user" : "kernel", fsr,
		@@ -74,7 +79,13 @@ asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,

		switch (type & 0x1F) {
		case MICROBLAZE_ILL_OPCODE_EXCEPTION:
		if (user_mode(regs)) {
		printk(KERN_WARNING "Illegal opcode exception in user mode.\n");
		_exception(SIGILL, regs, ILL_ILLOPC, addr);
		return;
		}
		printk(KERN_WARNING "Illegal opcode exception in kernel mode.\n");
		die("opcode exception", regs, SIGBUS);
		break;
		case MICROBLAZE_IBUS_EXCEPTION:
		if (user_mode(regs)) {
		@@ -95,11 +106,16 @@ asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
		die("bus exception", regs, SIGBUS);
		break;
		case MICROBLAZE_DIV_ZERO_EXCEPTION:
		printk(KERN_WARNING "Divide by zero exception\n");
		if (user_mode(regs)) {
		printk(KERN_WARNING "Divide by zero exception in user mode\n");
		_exception(SIGILL, regs, ILL_ILLOPC, addr);
		return;
		}
		printk(KERN_WARNING "Divide by zero exception in kernel mode.\n");
		die("Divide by exception", regs, SIGBUS);
		break;

		case MICROBLAZE_FPU_EXCEPTION:
		printk(KERN_WARNING "FPU exception\n");
		/* IEEE FP exception */
		/* I removed fsr variable and use code var for storing fsr */
		if (fsr & FSR_IO)
		@@ -115,7 +131,20 @@ asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
		_exception(SIGFPE, regs, fsr, addr);
		break;

		#ifdef CONFIG_MMU
		case MICROBLAZE_PRIVILEGED_EXCEPTION:
		printk(KERN_WARNING "Privileged exception\n");
		/* "brk r0,r0" - used as debug breakpoint */
		if (get_user(code, (unsigned long *)regs->pc) == 0
		&& code == 0x980c0000) {
		_exception(SIGTRAP, regs, TRAP_BRKPT, addr);
		} else {
		_exception(SIGILL, regs, ILL_PRVOPC, addr);
		}
		break;
		#endif
		default:
		/* FIXME what to do in unexpected exception */
		printk(KERN_WARNING "Unexpected exception %02x "
		"PC=%08x in %s mode\n", type, (unsigned int) addr,
		kernel_mode(regs) ? "kernel" : "user");