MIPS: Fix exception handler memcpy()

The exception handler subroutines are declared as a single char, but
when copied to the required addresses the copy length is 0x80.

When range checks are enabled for memcpy() this results in a build
failure, with error messages such as:

In file included from arch/mips/mti-malta/malta-init.c:15:
In function 'memcpy',
    inlined from 'mips_nmi_setup' at arch/mips/mti-malta/malta-init.c:98:2:
include/linux/string.h:376:4: error: call to '__read_overflow2' declared with attribute error: detected read beyond size of object passed as 2nd parameter
  376 |    __read_overflow2();
      |    ^~~~~~~~~~~~~~~~~~

Change the declarations to use type char[].
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: YunQiang Su <syq@debian.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/loongson2ef/common/init.c

@@ -19,10 +19,10 @@ unsigned long __maybe_unused _loongson_addrwincfg_base;
 static void __init mips_nmi_setup(void)
 {
 	void *base;
-	extern char except_vec_nmi;
+	extern char except_vec_nmi[];
 
 	base = (void *)(CAC_BASE + 0x380);
-	memcpy(base, &except_vec_nmi, 0x80);
+	memcpy(base, except_vec_nmi, 0x80);
 	flush_icache_range((unsigned long)base, (unsigned long)base + 0x80);
 }
 

arch/mips/loongson64/init.c

@@ -22,10 +22,10 @@ u32 node_id_offset;
 static void __init mips_nmi_setup(void)
 {
 	void *base;
-	extern char except_vec_nmi;
+	extern char except_vec_nmi[];
 
 	base = (void *)(CAC_BASE + 0x380);
-	memcpy(base, &except_vec_nmi, 0x80);
+	memcpy(base, except_vec_nmi, 0x80);
 	flush_icache_range((unsigned long)base, (unsigned long)base + 0x80);
 }
 

arch/mips/mti-malta/malta-init.c

@@ -90,24 +90,24 @@ static void __init console_config(void)
 static void __init mips_nmi_setup(void)
 {
 	void *base;
-	extern char except_vec_nmi;
+	extern char except_vec_nmi[];
 
 	base = cpu_has_veic ?
 		(void *)(CAC_BASE + 0xa80) :
 		(void *)(CAC_BASE + 0x380);
-	memcpy(base, &except_vec_nmi, 0x80);
+	memcpy(base, except_vec_nmi, 0x80);
 	flush_icache_range((unsigned long)base, (unsigned long)base + 0x80);
 }
 
 static void __init mips_ejtag_setup(void)
 {
 	void *base;
-	extern char except_vec_ejtag_debug;
+	extern char except_vec_ejtag_debug[];
 
 	base = cpu_has_veic ?
 		(void *)(CAC_BASE + 0xa00) :
 		(void *)(CAC_BASE + 0x300);
-	memcpy(base, &except_vec_ejtag_debug, 0x80);
+	memcpy(base, except_vec_ejtag_debug, 0x80);
 	flush_icache_range((unsigned long)base, (unsigned long)base + 0x80);
 }
 

arch/mips/pistachio/init.c

@@ -83,12 +83,12 @@ phys_addr_t mips_cdmm_phys_base(void)
 static void __init mips_nmi_setup(void)
 {
 	void *base;
-	extern char except_vec_nmi;
+	extern char except_vec_nmi[];
 
 	base = cpu_has_veic ?
 		(void *)(CAC_BASE + 0xa80) :
 		(void *)(CAC_BASE + 0x380);
-	memcpy(base, &except_vec_nmi, 0x80);
+	memcpy(base, except_vec_nmi, 0x80);
 	flush_icache_range((unsigned long)base,
 			   (unsigned long)base + 0x80);
 }
@@ -96,12 +96,12 @@ static void __init mips_nmi_setup(void)
 static void __init mips_ejtag_setup(void)
 {
 	void *base;
-	extern char except_vec_ejtag_debug;
+	extern char except_vec_ejtag_debug[];
 
 	base = cpu_has_veic ?
 		(void *)(CAC_BASE + 0xa00) :
 		(void *)(CAC_BASE + 0x300);
-	memcpy(base, &except_vec_ejtag_debug, 0x80);
+	memcpy(base, except_vec_ejtag_debug, 0x80);
 	flush_icache_range((unsigned long)base,
 			   (unsigned long)base + 0x80);
 }