FIXME: Workarounds for __builtin_return_address and _THIS_IP_

fs/xfs/xfs_buf.h

@@ -247,8 +247,13 @@ xfs_buf_read(
 {
 	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
 
+#ifndef __wasm__
 	return xfs_buf_read_map(target, &map, 1, flags, bpp, ops,
 			__builtin_return_address(0));
+#else
+	return xfs_buf_read_map(target, &map, 1, flags, bpp, ops,
+			(void*)0xdeadcafe);
+#endif
 }
 
 static inline void

fs/xfs/xfs_linux.h

@@ -123,14 +123,22 @@ typedef __u32			xfs_nlink_t;
 #define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */
 #define EFSBADCRC	EBADMSG		/* Bad CRC detected */
 
+#ifndef __wasm__
 #define __return_address __builtin_return_address(0)
+#else
+#define __return_address (void*)0xdeadcafe
+#endif
 
 /*
  * Return the address of a label.  Use barrier() so that the optimizer
  * won't reorder code to refactor the error jumpouts into a single
  * return, which throws off the reported address.
  */
+#ifndef __wasm__
 #define __this_address	({ __label__ __here; __here: barrier(); &&__here; })
+#else
+#define __this_address (void*)0xdeadcafe
+#endif
 
 #define XFS_PROJID_DEFAULT	0
 

include/linux/instruction_pointer.h

@@ -2,7 +2,16 @@
 #ifndef _LINUX_INSTRUCTION_POINTER_H
 #define _LINUX_INSTRUCTION_POINTER_H
 
+#ifndef __wasm__
 #define _RET_IP_		(unsigned long)__builtin_return_address(0)
+#else
+#define _RET_IP_		(unsigned long)0xdeadcafe
+#endif
+
+#ifndef __wasm__
 #define _THIS_IP_  ({ __label__ __here; __here: (unsigned long)&&__here; })
+#else
+#define _THIS_IP_ (unsigned long)0xdeadcafe
+#endif
 
 #endif /* _LINUX_INSTRUCTION_POINTER_H */

kernel/panic.c

@@ -641,14 +641,23 @@ void warn_slowpath_fmt(const char *file, int line, unsigned taint,
 	pr_warn(CUT_HERE);
 
 	if (!fmt) {
+#ifndef __wasm__
 		__warn(file, line, __builtin_return_address(0), taint,
 		       NULL, NULL);
+#else
+		__warn(file, line, (void*)0xdeadcafe, taint,
+		       NULL, NULL);
+#endif
 		return;
 	}
 
 	args.fmt = fmt;
 	va_start(args.args, fmt);
+#ifndef __wasm__
 	__warn(file, line, __builtin_return_address(0), taint, NULL, &args);
+#else
+	__warn(file, line, (void*)0xdeadcafe, taint, NULL, &args);
+#endif
 	va_end(args.args);
 }
 EXPORT_SYMBOL(warn_slowpath_fmt);
@@ -700,8 +709,13 @@ device_initcall(register_warn_debugfs);
 __visible noinstr void __stack_chk_fail(void)
 {
 	instrumentation_begin();
+#ifndef __wasm__
 	panic("stack-protector: Kernel stack is corrupted in: %pB",
 		__builtin_return_address(0));
+#else
+	panic("stack-protector: Kernel stack is corrupted in: %pB",
+		(void*)0xdeadcafe);
+#endif
 	instrumentation_end();
 }
 EXPORT_SYMBOL(__stack_chk_fail);

mm/util.c

@@ -603,9 +603,15 @@ void *kvmalloc_node(size_t size, gfp_t flags, int node)
 	 * about the resulting pointer, and cannot play
 	 * protection games.
 	 */
+#ifndef __wasm__
 	return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
 			flags, PAGE_KERNEL, VM_ALLOW_HUGE_VMAP,
 			node, __builtin_return_address(0));
+#else
+	return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
+			flags, PAGE_KERNEL, VM_ALLOW_HUGE_VMAP,
+			node, (void*)0xdeadcafe);
+#endif
 }
 EXPORT_SYMBOL(kvmalloc_node);
 

net/core/skbuff.c

@@ -887,7 +887,11 @@ kfree_skb_reason(struct sk_buff *skb, enum skb_drop_reason reason)
 
 	DEBUG_NET_WARN_ON_ONCE(reason <= 0 || reason >= SKB_DROP_REASON_MAX);
 
+#ifndef __wasm__
 	trace_kfree_skb(skb, __builtin_return_address(0), reason);
+#else
+	trace_kfree_skb(skb, (void*)0xdeadcafe, reason);
+#endif
 	__kfree_skb(skb);
 }
 EXPORT_SYMBOL(kfree_skb_reason);
@@ -2149,7 +2153,11 @@ void *skb_put(struct sk_buff *skb, unsigned int len)
 	skb->tail += len;
 	skb->len  += len;
 	if (unlikely(skb->tail > skb->end))
+#ifndef __wasm__
 		skb_over_panic(skb, len, __builtin_return_address(0));
+#else
+		skb_over_panic(skb, len, (void*)0xdeadcafe);
+#endif
 	return tmp;
 }
 EXPORT_SYMBOL(skb_put);
@@ -2168,7 +2176,11 @@ void *skb_push(struct sk_buff *skb, unsigned int len)
 	skb->data -= len;
 	skb->len  += len;
 	if (unlikely(skb->data < skb->head))
+#ifndef __wasm__
 		skb_under_panic(skb, len, __builtin_return_address(0));
+#else
+		skb_under_panic(skb, len, (void*)0xdeadcafe);
+#endif
 	return skb->data;
 }
 EXPORT_SYMBOL(skb_push);

tools/include/linux/kernel.h

@@ -15,7 +15,11 @@
 #define UINT_MAX	(~0U)
 #endif
 
+#ifndef __wasm__
 #define _RET_IP_		((unsigned long)__builtin_return_address(0))
+#else
+#define _RET_IP_		((unsigned long)0xdeadcafe)
+#endif
 
 #define PERF_ALIGN(x, a)	__PERF_ALIGN_MASK(x, (typeof(x))(a)-1)
 #define __PERF_ALIGN_MASK(x, mask)	(((x)+(mask))&~(mask))