arm64: traps: Allow force_signal_inject to pass esr error code

Some error signal need to pass proper ARM esr error code to userspace to
better identify the cause of the signal. So the function
force_signal_inject is extended to pass this as a parameter. The
existing code is not affected by this change.
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Link: https://lore.kernel.org/r/20200914083656.21428-3-amit.kachhap@arm.comSigned-off-by: Will Deacon <will@kernel.org>

arch/arm64/include/asm/traps.h

@@ -24,7 +24,7 @@ struct undef_hook {
 
 void register_undef_hook(struct undef_hook *hook);
 void unregister_undef_hook(struct undef_hook *hook);
-void force_signal_inject(int signal, int code, unsigned long address);
+void force_signal_inject(int signal, int code, unsigned long address, unsigned int err);
 void arm64_notify_segfault(unsigned long addr);
 void arm64_force_sig_fault(int signo, int code, void __user *addr, const char *str);
 void arm64_force_sig_mceerr(int code, void __user *addr, short lsb, const char *str);

arch/arm64/kernel/fpsimd.c

@@ -312,7 +312,7 @@ static void fpsimd_save(void)
 				 * re-enter user with corrupt state.
 				 * There's no way to recover, so kill it:
 				 */
-				force_signal_inject(SIGKILL, SI_KERNEL, 0);
+				force_signal_inject(SIGKILL, SI_KERNEL, 0, 0);
 				return;
 			}
 
@@ -936,7 +936,7 @@ void do_sve_acc(unsigned int esr, struct pt_regs *regs)
 {
 	/* Even if we chose not to use SVE, the hardware could still trap: */
 	if (unlikely(!system_supports_sve()) || WARN_ON(is_compat_task())) {
-		force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc);
+		force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc, 0);
 		return;
 	}
 

arch/arm64/kernel/traps.c

@@ -412,7 +412,7 @@ static int call_undef_hook(struct pt_regs *regs)
 	return fn ? fn(regs, instr) : 1;
 }
 
-void force_signal_inject(int signal, int code, unsigned long address)
+void force_signal_inject(int signal, int code, unsigned long address, unsigned int err)
 {
 	const char *desc;
 	struct pt_regs *regs = current_pt_regs();
@@ -438,7 +438,7 @@ void force_signal_inject(int signal, int code, unsigned long address)
 		signal = SIGKILL;
 	}
 
-	arm64_notify_die(desc, regs, signal, code, (void __user *)address, 0);
+	arm64_notify_die(desc, regs, signal, code, (void __user *)address, err);
 }
 
 /*
@@ -455,7 +455,7 @@ void arm64_notify_segfault(unsigned long addr)
 		code = SEGV_ACCERR;
 	mmap_read_unlock(current->mm);
 
-	force_signal_inject(SIGSEGV, code, addr);
+	force_signal_inject(SIGSEGV, code, addr, 0);
 }
 
 void do_undefinstr(struct pt_regs *regs)
@@ -468,14 +468,14 @@ void do_undefinstr(struct pt_regs *regs)
 		return;
 
 	BUG_ON(!user_mode(regs));
-	force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc);
+	force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc, 0);
 }
 NOKPROBE_SYMBOL(do_undefinstr);
 
 void do_bti(struct pt_regs *regs)
 {
 	BUG_ON(!user_mode(regs));
-	force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc);
+	force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc, 0);
 }
 NOKPROBE_SYMBOL(do_bti);
 
@@ -528,7 +528,7 @@ static void user_cache_maint_handler(unsigned int esr, struct pt_regs *regs)
 		__user_cache_maint("ic ivau", address, ret);
 		break;
 	default:
-		force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc);
+		force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc, 0);
 		return;
 	}
 
@@ -581,7 +581,7 @@ static void mrs_handler(unsigned int esr, struct pt_regs *regs)
 	sysreg = esr_sys64_to_sysreg(esr);
 
 	if (do_emulate_mrs(regs, sysreg, rt) != 0)
-		force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc);
+		force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc, 0);
 }
 
 static void wfi_handler(unsigned int esr, struct pt_regs *regs)