FIXME: verify x32 ABI support in regs_load.S
--- linux-5.11/tools/scripts/Makefile.arch.orig	2021-02-25 19:40:18.181160970 +0100
+++ linux-5.11/tools/scripts/Makefile.arch	2021-02-25 19:46:07.599314457 +0100
@@ -34,8 +34,15 @@
 endif
 
 LP64 := $(shell echo __LP64__ | ${CC} ${CFLAGS} -E -x c - | tail -n 1)
+ILP32 := $(shell echo __ILP32__ | ${CC} ${CFLAGS} -E -x c - | tail -n 1)
+X86_64 := $(shell echo __x86_64__ | ${CC} ${CFLAGS} -E -x c - | tail -n 1)
 ifeq ($(LP64), 1)
   IS_64_BIT := 1
 else
   IS_64_BIT := 0
 endif
+ifeq ($(X86_64)_$(ILP32), 1_1)
+  IS_X32_BIT := 1
+else
+  IS_X32_BIT := 0
+endif
--- linux-5.11/tools/perf/Makefile.config.orig	2021-02-25 19:40:18.184494476 +0100
+++ linux-5.11/tools/perf/Makefile.config	2021-02-25 19:48:36.007024754 +0100
@@ -61,6 +61,11 @@
     LIBUNWIND_LIBS = -lunwind-x86 -llzma -lunwind
   endif
   NO_PERF_REGS := 0
+  ifeq (${IS_X32_BIT}, 1)
+    CFLAGS += -DHAVE_ARCH_X32_SUPPORT
+    ARCH_INCLUDE = ../../arch/x86/lib/memcpy_64.S ../../arch/x86/lib/memset_64.S
+    LIBUNWIND_LIBS = -lunwind-x86_64 -llzma -lunwind
+  endif
 endif
 
 ifeq ($(SRCARCH),arm)
--- linux-5.11/tools/perf/arch/x86/tests/regs_load.S.orig	2021-02-14 23:32:24.000000000 +0100
+++ linux-5.11/tools/perf/arch/x86/tests/regs_load.S	2021-02-25 21:46:57.425008548 +0100
@@ -62,6 +62,41 @@
 	ret
 SYM_FUNC_END(perf_regs_load)
 #else
+#ifdef HAVE_ARCH_X32_SUPPORT
+SYM_FUNC_START(perf_regs_load)
+	movq %rax, AX(%edi)
+	movq %rbx, BX(%edi)
+	movq %rcx, CX(%edi)
+	movq %rdx, DX(%edi)
+	movq %rsi, SI(%edi)
+	movq %rdi, DI(%edi)
+	movq %rbp, BP(%edi)
+
+	leaq 8(%rsp), %rax /* exclude this call.  */
+	movq %rax, SP(%edi)
+
+	movq 0(%rsp), %rax
+	movq %rax, IP(%edi)
+
+	movq $0, FLAGS(%edi)
+	movq $0, CS(%edi)
+	movq $0, SS(%edi)
+	movq $0, DS(%edi)
+	movq $0, ES(%edi)
+	movq $0, FS(%edi)
+	movq $0, GS(%edi)
+
+	movq %r8,  R8(%edi)
+	movq %r9,  R9(%edi)
+	movq %r10, R10(%edi)
+	movq %r11, R11(%edi)
+	movq %r12, R12(%edi)
+	movq %r13, R13(%edi)
+	movq %r14, R14(%edi)
+	movq %r15, R15(%edi)
+	ret
+SYM_FUNC_END(perf_regs_load)
+#else
 SYM_FUNC_START(perf_regs_load)
 	push %edi
 	movl 8(%esp), %edi
@@ -90,6 +125,7 @@
 	ret
 SYM_FUNC_END(perf_regs_load)
 #endif
+#endif
 
 /*
  * We need to provide note.GNU-stack section, saying that we want
--- linux-3.19/tools/perf/builtin-kvm.c~	2015-02-09 03:54:22.000000000 +0100
+++ linux-3.19/tools/perf/builtin-kvm.c	2015-04-11 12:36:00.511251770 +0200
@@ -565,7 +565,7 @@
 	gettimeofday(&tv, NULL);
 	if (localtime_r(&tv.tv_sec, &ltime)) {
 		strftime(date, sizeof(date), "%H:%M:%S", &ltime);
-		pr_info("%s.%06ld", date, tv.tv_usec);
+		pr_info("%s.%06lld", date, (long long) tv.tv_usec);
 	} else
 		pr_info("00:00:00.000000");
 
--- linux-5.11/tools/perf/arch/x86/util/unwind-libunwind.c.orig	2021-02-25 20:23:15.561804956 +0100
+++ linux-5.11/tools/perf/arch/x86/util/unwind-libunwind.c	2021-02-25 20:39:56.170430285 +0100
@@ -8,7 +8,7 @@
 #include "../../util/unwind.h"
 #endif
 
-#ifdef HAVE_ARCH_X86_64_SUPPORT
+#if defined(HAVE_ARCH_X86_64_SUPPORT) || defined(HAVE_ARCH_X32_SUPPORT)
 int LIBUNWIND__ARCH_REG_ID(int regnum)
 {
 	int id;