Toolchain: Enough to make rebuild-toolchain aarch64 work

The gcc patch might not be completely correct, but at least the
toolchain completes building.

Meta/serenity.sh

@@ -94,6 +94,10 @@ get_top_dir() {
 }
 
 is_valid_target() {
+    if [ "$TARGET" = "aarch64" ]; then
+        CMAKE_ARGS+=("-DSERENITY_ARCH=aarch64")
+        return 0
+    fi
     if [ "$TARGET" = "lagom" ]; then
         CMAKE_ARGS+=("-DBUILD_LAGOM=ON")
         return 0

Toolchain/Patches/binutils.patch

@@ -1,8 +1,8 @@
 diff --git a/bfd/config.bfd b/bfd/config.bfd
-index 30087e3b..7658cf30 100644
+index 30087e3b..8b192b2e 100644
 --- a/bfd/config.bfd
 +++ b/bfd/config.bfd
-@@ -223,7 +223,24 @@ esac
+@@ -223,7 +223,29 @@ esac
  
  case "${targ}" in
  # START OF targmatch.h
@@ -23,6 +23,11 @@ index 30087e3b..7658cf30 100644
 +    targ_selvecs=
 +    targ64_selvecs=
 +    ;;
++  aarch64-*-serenity*)
++    targ_defvec=aarch64_elf64_le_vec
++    targ_selvecs=
++    want64=true
++    ;;
 +
    aarch64-*-darwin*)
      targ_defvec=aarch64_mach_o_vec
@@ -40,15 +45,16 @@ index 7384e919..aa02c3f6 100755
  	     | hpux* | unos* | osf* | luna* | dgux* | auroraux* | solaris* \
  	     | sym* |  plan9* | psp* | sim* | xray* | os68k* | v88r* \
 diff --git a/gas/configure.tgt b/gas/configure.tgt
-index 338892ad..0cac7829 100644
+index 338892ad..3c03ee8b 100644
 --- a/gas/configure.tgt
 +++ b/gas/configure.tgt
-@@ -123,6 +123,8 @@ esac
+@@ -123,6 +123,9 @@ esac
  generic_target=${cpu_type}-$vendor-$os
  # Note: This table is alpha-sorted, please try to keep it that way.
  case ${generic_target} in
 +  i386-*-serenity*)                     fmt=elf;;
 +  arm-*-serenity*)                      fmt=elf;;
++  aarch64-*-serenity*)                  fmt=elf;;
    aarch64*-*-elf*)			fmt=elf;;
    aarch64*-*-fuchsia*)			fmt=elf;;
    aarch64*-*-genode*)			fmt=elf;;
@@ -93,10 +99,10 @@ index ef2e99e0..657d24a2 100644
  	ei386pep.c \
  	emmo.c
 diff --git a/ld/configure.tgt b/ld/configure.tgt
-index 6205d7c9..390c10d7 100644
+index 6205d7c9..00d97c37 100644
 --- a/ld/configure.tgt
 +++ b/ld/configure.tgt
-@@ -43,6 +43,19 @@ targ64_extra_libpath=
+@@ -43,6 +43,23 @@ targ64_extra_libpath=
  # Please try to keep this table more or less in alphabetic order - it
  # makes it much easier to lookup a specific archictecture.
  case "${targ}" in
@@ -112,6 +118,10 @@ index 6205d7c9..390c10d7 100644
 +arm-*-serenity*)
 +			targ_emul=armelf_serenity
 +			targ_extra_emuls="armelf_serenity armelf"
++			;;
++aarch64-*-serenity*)
++			targ_emul=aarch64elf
++			targ_extra_emuls=
 +			;;
  aarch64_be-*-elf)	targ_emul=aarch64elfb
  			targ_extra_emuls="aarch64elf aarch64elf32 aarch64elf32b armelfb armelf"
@@ -129,6 +139,13 @@ index 00000000..517cd626
 +
 +unset STACK_ADDR
 +unset EMBEDDED
+diff --git a/ld/emulparams/elf_aarch64_serenity.sh b/ld/emulparams/elf_aarch64_serenity.sh
+new file mode 100644
+index 00000000..45a05bf4
+--- /dev/null
++++ b/ld/emulparams/elf_aarch64_serenity.sh
+@@ -0,0 +1 @@
++. ${srcdir}/emulparams/elf_aarch64.sh
 diff --git a/ld/emulparams/elf_i386_serenity.sh b/ld/emulparams/elf_i386_serenity.sh
 new file mode 100644
 index 00000000..342d5298

Toolchain/Patches/gcc.patch

@@ -46,7 +46,7 @@ index a75b44ee4..6fab7c3ca 100644
 +
  ; This comment is to ensure we retain the blank line above.
 diff --git a/gcc/config.gcc b/gcc/config.gcc
-index 357b0bed0..c6c23044d 100644
+index 357b0bed0..18d099584 100644
 --- a/gcc/config.gcc
 +++ b/gcc/config.gcc
 @@ -686,6 +686,12 @@ x86_cpus="generic intel"
@@ -62,7 +62,7 @@ index 357b0bed0..c6c23044d 100644
  *-*-darwin*)
    tmake_file="t-darwin "
    tm_file="${tm_file} darwin.h"
-@@ -1084,6 +1090,15 @@ case ${target} in
+@@ -1084,6 +1090,18 @@ case ${target} in
  esac
  
  case ${target} in
@@ -74,6 +74,9 @@ index 357b0bed0..c6c23044d 100644
 +    ;;
 +arm-*-serenity*)
 +    tm_file="dbxelf.h elfos.h arm/elf.h arm/aout.h glibc-stdint.h arm/serenity-elf.h ${tm_file} serenity.h"
++    ;;
++aarch64-*-serenity*)
++    tm_file="${tm_file} dbxelf.h elfos.h aarch64/aarch64-elf.h glibc-stdint.h serenity.h"
 +    ;;
  aarch64*-*-elf | aarch64*-*-fuchsia* | aarch64*-*-rtems*)
  	tm_file="${tm_file} dbxelf.h elfos.h newlib-stdint.h"
@@ -267,10 +270,10 @@ index 9b28369e3..6821ed4ba 100755
  
  if test x$gcc_cv_target_dl_iterate_phdr = xyes; then
 diff --git a/libgcc/config.host b/libgcc/config.host
-index 50f000622..dc20e672a 100644
+index 50f000622..fa30ef089 100644
 --- a/libgcc/config.host
 +++ b/libgcc/config.host
-@@ -1504,6 +1504,22 @@ nvptx-*)
+@@ -1504,6 +1504,30 @@ nvptx-*)
  	tmake_file="$tmake_file nvptx/t-nvptx"
  	extra_parts="crt0.o"
  	;;
@@ -289,6 +292,14 @@ index 50f000622..dc20e672a 100644
 +	tm_file="$tm_file arm/bpabi-lib.h"
 +	unwind_header=config/arm/unwind-arm.h
 +	extra_parts="$extra_parts crti.o crtn.o"
++	;;
++aarch64-*-serenity*)
++	extra_parts="$extra_parts crti.o crtbegin.o crtend.o crtn.o"
++	extra_parts="$extra_parts crtfastmath.o"
++	tmake_file="$tmake_file ${cpu_type}/t-aarch64"
++	tmake_file="$tmake_file ${cpu_type}/t-lse t-slibgcc-libgcc"
++	tmake_file="$tmake_file ${cpu_type}/t-softfp t-softp t-crtfm"
++	md_unwind_header=aarch64/aarch64-unwind.h
 +	;;
  *)
  	echo "*** Configuration ${host} not supported" 1>&2

Userland/Libraries/LibC/setjmp.h

@@ -35,6 +35,9 @@ struct __jmp_buf {
     uint64_t rbp;
     uint64_t rsp;
     uint64_t rip;
+#elif __aarch64__
+    // FIXME: This is likely incorrect.
+    uint64_t regs[22];
 #else
 #    error
 #endif
@@ -49,6 +52,8 @@ typedef struct __jmp_buf sigjmp_buf[1];
 static_assert(sizeof(struct __jmp_buf) == 32, "struct __jmp_buf unsynchronized with i386/setjmp.S");
 #elif __x86_64__
 static_assert(sizeof(struct __jmp_buf) == 72, "struct __jmp_buf unsynchronized with x86_64/setjmp.S");
+#elif __aarch64__
+static_assert(sizeof(struct __jmp_buf) == 184, "struct __jmp_buf unsynchronized with aarch64/setjmp.S");
 #else
 #    error
 #endif