Fix aarch64 setjmp abi

We now store values in jmp_buf where the compiler wants them to be. This
fixes code that calls __builtin_setjmp() and __builtin_longjmp() such as
libunwind. All libcxxabi tests are now passing on ARM64.

See #1076

Author: jart

build/htags

@@ -66,7 +66,7 @@ set -- --regex-c='/^extern [^(]*(\*const \([^)]*\))(/\1/b' "$@"
 #   struct WorstSoftwareEver;
 set -- --regex-c='/^struct.*;$/uehocruehcroue/b' "$@"
 
-exec $TAGS                                                        \
+build/run $TAGS                                                   \
      -e                                                           \
      --langmap=c:.c.h                                             \
      --exclude=libc/nt/struct/imagefileheader.internal.h          \

build/run

@@ -1,9 +1,8 @@
 #!/bin/sh
-if printf '%s\n' "$*" | grep aarch64 >/dev/null 2>&1; then
-  if [ ! -f o/third_party/qemu/qemu-aarch64 ]; then
-    make -j8 o/third_party/qemu/qemu-aarch64
-  fi
-  exec o/third_party/qemu/qemu-aarch64 "$@"
+UNAMEM=$(uname -m)
+UNAMES=$(uname -s)
+if [ x"$UNAMES" = x"Darwin" ] && [ x"$UNAMEM" = x"arm64" ]; then
+  exec ape "$@"
 else
   exec "$@"
 fi

libc/nexgen32e/longjmp.S

@@ -43,13 +43,13 @@ _longjmp:
 	mov	48(%rdi),%r15
 	jmp	*56(%rdi)
 #elif defined(__aarch64__)
-	ldp	x19,x20,[x0,#0]
-	ldp	x21,x22,[x0,#16]
+	ldp	x29,x30,[x0,#0]
+	ldp	x2,x22,[x0,#16]
 	ldp	x23,x24,[x0,#32]
 	ldp	x25,x26,[x0,#48]
 	ldp	x27,x28,[x0,#64]
-	ldp	x29,x30,[x0,#80]
-	ldr	x2,[x0,#104]
+	ldp	x19,x20,[x0,#80]
+	ldr	x21,[x0,#104]
 	mov	sp,x2
 	ldp	d8 ,d9,[x0,#112]
 	ldp	d10,d11,[x0,#128]

libc/nexgen32e/setjmp.S

@@ -44,14 +44,14 @@ _setjmp:
 	xor	%eax,%eax
 	ret
 #elif defined(__aarch64__)
-	stp	x19,x20,[x0,#0]
-	stp	x21,x22,[x0,#16]
+	mov	x2,sp
+	stp	x29,x30,[x0,#0]
+	stp	x2,x22,[x0,#16]
 	stp	x23,x24,[x0,#32]
 	stp	x25,x26,[x0,#48]
 	stp	x27,x28,[x0,#64]
-	stp	x29,x30,[x0,#80]
-	mov	x2,sp
-	str	x2,[x0,#104]
+	stp	x19,x20,[x0,#80]
+	str	x21,[x0,#104]
 	stp	d8,d9,[x0,#112]
 	stp	d10,d11,[x0,#128]
 	stp	d12,d13,[x0,#144]

third_party/libcxxabi/test/BUILD.mk

@@ -1,8 +1,6 @@
 #-*-mode:makefile-gmake;indent-tabs-mode:t;tab-width:8;coding:utf-8-*-┐
 #── vi: set noet ft=make ts=8 sw=8 fenc=utf-8 :vi ────────────────────┘
 
-ifeq ($(MODE), )
-
 PKGS += THIRD_PARTY_LIBCXXABI_TEST
 
 THIRD_PARTY_LIBCXXABI_TEST_A = o/$(MODE)/third_party/libcxxabi/test/test.a
@@ -109,6 +107,7 @@ THIRD_PARTY_LIBCXXABI_TEST_CHECKS =					\
 
 THIRD_PARTY_LIBCXXABI_TEST_DIRECTDEPS =					\
 	LIBC_NEXGEN32E							\
+	LIBC_LOG							\
 	THIRD_PARTY_LIBCXX						\
 	THIRD_PARTY_LIBCXXABI
 
@@ -168,8 +167,6 @@ o/$(MODE)/third_party/libcxxabi/test/incomplete_type.sh.com.dbg:	\
 		$(APE_NO_MODIFY_SELF)
 	@$(APELINK)
 
-endif
-
 o/$(MODE)/third_party/libcxxabi/test/catch_multi_level_pointer.pass.o: private COPTS += -O0
 o/$(MODE)/third_party/libcxxabi/test/catch_multi_level_pointer.pass.o: private QUOTA += -C30 -M4000m