diff --git a/arch/aarch64/defs.h b/arch/aarch64/defs.h
index 469e69a..8c28be1 100644
--- a/arch/aarch64/defs.h
+++ b/arch/aarch64/defs.h
@@ -19,7 +19,7 @@
 #endif
 
 #define FETCH_LINKPTR(dest) \
-	asm("mov	x0, %0" : "=rm" ((dest)))
+	asm("mov	x0, %0" : "=r" ((dest)))
 
 #include "common-defs.h"
 
diff --git a/arch/arm/defs.h b/arch/arm/defs.h
index 0834d9e..7dd03b3 100644
--- a/arch/arm/defs.h
+++ b/arch/arm/defs.h
@@ -6,7 +6,7 @@
 #define TYPE(__proc)
 
 #define FETCH_LINKPTR(dest) \
-	asm("movs    r0, %0" : "=rm" ((dest)))
+	asm("movs    r0, %0" : "=r" ((dest)))
 
 #include "common-defs.h"
 
diff --git a/arch/common/common-trampoline.c b/arch/common/common-trampoline.c
index f182f99..dc5f2d3 100644
--- a/arch/common/common-trampoline.c
+++ b/arch/common/common-trampoline.c
@@ -19,6 +19,7 @@ libucontext_trampoline(void)
 {
 	libucontext_ucontext_t *uc_link;
 
+    // FIXME: there's no guarantee that input is not clobbered!
 	FETCH_LINKPTR(uc_link);
 
 	if (uc_link == NULL)
diff --git a/arch/m68k/defs.h b/arch/m68k/defs.h
index 6a00651..fc19252 100644
--- a/arch/m68k/defs.h
+++ b/arch/m68k/defs.h
@@ -27,7 +27,7 @@
 #define PC_OFFSET	REG_OFFSET(REG_PC)
 
 #define FETCH_LINKPTR(dest) \
-	asm("mov.l (%%sp, %%d7.l * 4), %0" : "=rm" ((dest)))
+	asm("mov.l (%%sp, %%d7.l * 4), %0" :: "r" ((dest)))
 
 #include "common-defs.h"
 
diff --git a/arch/riscv64/defs.h b/arch/riscv64/defs.h
index 191e8c2..d9b7647 100644
--- a/arch/riscv64/defs.h
+++ b/arch/riscv64/defs.h
@@ -48,7 +48,7 @@
 #define PC_OFFSET	REG_OFFSET(REG_PC)
 
 #define FETCH_LINKPTR(dest) \
-	asm("mv	%0, s1" : "=rm" ((dest)))
+	asm("mv	%0, s1" : "=r" ((dest)))
 
 #include "common-defs.h"
 
diff --git a/arch/sh/defs.h b/arch/sh/defs.h
index dd13d47..7cddaef 100644
--- a/arch/sh/defs.h
+++ b/arch/sh/defs.h
@@ -13,7 +13,7 @@
 #define REG_MACL		(21)
 
 #define FETCH_LINKPTR(dest)	\
-	asm("mov r8, %0" : "=rm" (dest));
+	asm("mov r8, %0" : "=r" (dest));
 
 #include "common-defs.h"
 
diff --git a/arch/x86/defs.h b/arch/x86/defs.h
index 2b0c68d..0bf73ba 100644
--- a/arch/x86/defs.h
+++ b/arch/x86/defs.h
@@ -60,7 +60,7 @@
 #define MCONTEXT_GREGS	(20)
 
 #define FETCH_LINKPTR(dest) \
-	asm("movl (%%esp, %%ebx, 4), %0" : "=rm" ((dest)));
+	asm("movl (%%esp, %%ebx, 4), %0" : "=r" ((dest)));
 
 #include "common-defs.h"
 
diff --git a/arch/x86_64/defs.h b/arch/x86_64/defs.h
index 4a53f96..c5fd126 100644
--- a/arch/x86_64/defs.h
+++ b/arch/x86_64/defs.h
@@ -32,7 +32,7 @@
 #define REG_SZ		(8)
 
 #define FETCH_LINKPTR(dest) \
-	asm("movq (%%rbx), %0" : "=rm" ((dest)));
+	asm("movq (%%rbx), %0" : "=r" ((dest)));
 
 #include "common-defs.h"