WIP linux multiarch support

assets/build/linux/config.debug.yaml

@@ -0,0 +1,9 @@
+---
+ccflags: [
+  "-g3",
+  "-ggdb",
+]
+
+ldflags: [
+  "-g",
+]

assets/build/linux/config.release.yaml

@@ -0,0 +1,3 @@
+ccflags: [
+  "-O3",
+]

assets/build/linux/global.yaml

@@ -0,0 +1,39 @@
+---
+cc: "clang-16"
+cxx: "clang++-16"
+ld: "ld.lld-16"
+ar: ar
+nasm: nasm
+objcopy: objcopy
+
+ccflags: [
+  "-I${source_root}/src/include",
+  "-I${source_root}/sysroot/include/c++/v1",
+  "-fcolor-diagnostics",
+  "-U__STDCPP_THREADS__",
+  "-D__jsix_config=${build_config}",
+  "-D__jsix_config_${build_config}",
+  "-DVERSION_MAJOR=${version_major}",
+  "-DVERSION_MINOR=${version_minor}",
+  "-DVERSION_PATCH=${version_patch}",
+  "-DVERSION_GITSHA=0x${version_sha}",
+  '-DGIT_VERSION=\"${version_major}.${version_minor}.${version_patch}+${version_sha}\"',
+  '-DGIT_VERSION_WIDE=L\"${version_major}.${version_minor}.${version_patch}+${version_sha}\"',
+
+  "-Wformat=2", "-Winit-self", "-Winline", "-Wmissing-format-attribute",
+  "-Wmissing-include-dirs", "-Wswitch", "-Wundef", "-Wdisabled-optimization",
+  "-Wpointer-arith", "-Wno-attributes", "-Wno-sign-compare", "-Wno-multichar",
+  "-Wno-div-by-zero", "-Wno-endif-labels", "-Wno-pragmas", "-Wno-format-extra-args",
+  "-Wno-unused-result", "-Wno-deprecated-declarations", "-Wno-unused-function",
+  "-Wno-address-of-packed-member", "-Wno-invalid-offsetof", "-Wno-format-nonliteral",
+  "-Werror" ]
+
+asflags: [
+  "-DVERSION_MAJOR=${version_major}",
+  "-DVERSION_MINOR=${version_minor}",
+  "-DVERSION_PATCH=${version_patch}",
+  "-DVERSION_GITSHA=0x${version_sha}",
+  "-I${source_root}/src/include" ]
+
+cflags: [ "-std=c11" ]
+cxxflags: [ "-std=c++17" ]

assets/build/linux/rules.ninja

@@ -0,0 +1,91 @@
+rule compile.c
+  command = $cc -MMD -MF $out.d $cflags $ccflags -o $out -c $in
+  description = Compiling [$target]:$name
+  depfile = $out.d
+  deps = gcc
+
+rule dump_c_defs
+  command = echo | $cc $ccflags $cflags -dM -E - > $out
+  description = Dumping C defines for $target
+
+rule dump_c_run
+  command = echo '#!/bin/bash' > $out; echo '$cc $ccflags $cflags $$*' >> $
+      $out; chmod a+x $out
+  description = Dumping C arguments for $target
+
+rule compile.cpp
+  command = $cxx -MMD -MF $out.d $cxxflags $ccflags -o $out -c $in
+  description = Compiling [$target]:$name
+  depfile = $out.d
+  deps = gcc
+
+rule dump_cpp_defs
+  command = echo | $cxx -x c++ $ccflags $cxxflags -dM -E - > $out
+  description = Dumping C++ defines for $target
+
+rule dump_cpp_run
+  command = echo '#!/bin/bash' > $out; echo '$cxx $ccflags $cxxflags $$*' $
+      >> $out; chmod a+x $out
+  description = Dumping C++ arguments for $target
+
+rule compile.s
+  command = $nasm -o $out -felf64 -MD $out.d $asflags $in
+  description = Assembling [$target]:$name
+  depfile = $out.d
+  deps = gcc
+
+rule parse.cog
+  command = cog -o $out -d -D target=$target $cogflags $in
+  description = Parsing [$target]:$name
+
+rule exe
+  command = $ld $ldflags -o $out $in $libs
+  description = Linking exe [$target]:$name
+
+rule driver
+  command = $ld $ldflags -o $out $in $libs
+  description = Linking driver [$target]:$name
+
+rule lib
+  command = $ld -shared -soname $soname $ldflags -o $out $in $libs
+  description = Linking [$target]:$name
+
+rule lib_static
+  command = $ar qcs $out $in
+  description = Archiving [$target]:$name
+
+rule cp
+  command = cp $in $out
+  description = Copying [$target]:$name
+
+rule dump
+  command = objdump -DSC -M intel $in > $out
+  description = Dumping decompiled $name
+
+rule makest
+    description = Making symbol table
+    command = nm -n -S --demangle $in | ${source_root}/scripts/build_symbol_table.py $out
+
+rule makeinitrd
+    description = Creating $name
+    command = ${source_root}/scripts/mkj6romfs.py -c $format $in $out
+
+rule makefat
+    description = Creating $name
+    command = $
+        cp $in $out; $
+        mcopy -s -D o -i $out@@1M ${build_root}/fatroot/* ::/
+
+rule strip
+    description = Stripping $name
+    command = $
+        cp $in $out; $
+        objcopy --only-keep-debug $out $debug; $
+        strip --discard-all -g $out; $
+        objcopy --add-gnu-debuglink=$debug $out
+
+rule touch
+    command = touch $out
+
+rule compdb
+    command = ninja -t compdb > $out

assets/build/linux/target.init.yaml

@@ -0,0 +1,39 @@
+---
+ccflags: [
+  "--target=x86_64-jsix-elf",
+  "-fno-omit-frame-pointer",
+  "-fno-stack-protector",
+
+  "-fvisibility=hidden",
+  "-fvisibility-inlines-hidden",
+
+  "-D__ELF__",
+  "-D__jsix__",
+  "-U__linux",
+  "-U__linux__",
+
+  "-DMSPACES",
+
+  "--sysroot='${source_root}/sysroot'"
+]
+
+
+cxxflags: [
+  "-fno-exceptions",
+  "-fno-rtti",
+]
+
+ldflags: [
+  "-Bstatic",
+  "-m", "elf_x86_64",
+  "--sysroot='${source_root}/sysroot'",
+  "--no-eh-frame-hdr",
+  "-L", "${source_root}/sysroot/lib",
+  "-z", "separate-code",
+  "-lc++", "-lc++abi", "-lunwind",
+  "--no-dependent-libraries",
+]
+
+libs: [
+  "${target_dir}/crt0.o",
+]

assets/build/linux/target.user.exe.yaml

@@ -0,0 +1,16 @@
+---
+
+ccflags: [
+  "-fpie"
+]
+
+ldflags: [
+  "-pie",
+  "-rpath", "${target_dir}",
+  "--dynamic-linker", "/lib64/ld-linux-x86-64.so.2",
+  "--push-state", "--as-needed", "-Bstatic", "-lc++", "-lc++abi", "-lunwind", "--pop-state",
+]
+
+libs: [
+  "${target_dir}/crt0.o",
+]

assets/build/linux/target.user.shared.yaml

@@ -0,0 +1,7 @@
+---
+ccflags: [
+]
+
+ldflags: [
+  "-shared",
+]

assets/build/linux/target.user.yaml

@@ -0,0 +1,33 @@
+---
+asflags: []
+
+ccflags: [
+  "--target=x86_64-jsix-elf",
+  "-fno-omit-frame-pointer",
+  "-fno-stack-protector",
+
+  "-fvisibility=hidden",
+  "-fvisibility-inlines-hidden",
+
+  "-D__ELF__",
+  "-D__jsix__",
+  "-U__linux",
+  "-U__linux__",
+
+  "--sysroot='${source_root}/sysroot'",
+  "-fpic",
+]
+
+cxxflags: [
+  "-fno-exceptions",
+  "-fno-rtti",
+  ]
+
+ldflags: [
+  "-m", "elf_x86_64",
+  "--sysroot='${source_root}/sysroot'",
+  "--no-eh-frame-hdr",
+  "-L", "${source_root}/sysroot/lib",
+  "-z", "separate-code",
+  "--no-dependent-libraries",
+]

src/boot/boot.module

@@ -6,6 +6,7 @@ boot = module("boot",
     target = "boot",
     deps = [ "cpu", "elf", "util", "bootproto" ],
     static = True,
+    skip_arches = [ "linux" ],
     sources = [
         "allocator.cpp",
         "bootconfig.cpp",

src/kernel/kernel.module

@@ -8,6 +8,7 @@ kernel = module("kernel",
     deps = [ "util", "cpu", "bootproto", "j6", "acpi" ],
     static = True,
     ld_script = "kernel.ld",
+    skip_arches = [ "linux" ],
     sources = [
         "apic.cpp",
         "kassert.cpp",

src/kernel/panic.serial/serial.module

@@ -7,6 +7,7 @@ panic = module("panic.serial",
     includes = [ ".." ],
     description = "Serial panic handler",
     ld_script = "panic.serial.ld",
+    skip_arches = [ "linux" ],
     sources = [
         "display.cpp",
         "entry.s",

src/libraries/j6/j6.module

@@ -21,6 +21,9 @@ j6 = module("j6",
         "amd64": [
             "syscalls.s.cog",
         ],
+        "linux": [
+            "linux/syscalls.s.cog",
+        ],
     },
     public_headers = [
         "j6/cap_flags.h.cog",

src/libraries/j6/linux/syscalls.s.cog

@@ -0,0 +1,49 @@
+; vim: ft=asm
+
+%macro define_syscall 2
+    global j6_%1: function (j6_%1.end - j6_%1)
+    j6_%1:
+        push rbp
+        mov rbp, rsp
+
+        ; if the syscall has more than 6 arguments, the rest
+        ; will be pushed on the stack. in that case, we'd need
+        ; to pass this stack pointer to the kernel, so stash
+        ; off rbx (callee-saved) and pass the pointer to the
+        ; arguments there.
+        push rbx
+        mov rbx, rbp
+        add rbx, 16 ; account for stack frame
+
+        ; args should already be in rdi, etc, but rcx will
+        ; get stomped, so stash it in r10, which isn't a
+        ; callee-saved register, but also isn't used in the
+        ; function call ABI.
+        mov r10, rcx
+
+        mov rax, %2
+        syscall
+        ; result is now already in rax, so just return
+
+        pop rbx
+        pop rbp
+        ret
+    .end:
+%endmacro
+
+; [[[cog code generation
+;   from definitions.context import Context
+;
+;   ctx = Context(definitions_path)
+;   ctx.parse("syscalls.def")
+;   syscalls = ctx.interfaces['syscalls']
+;
+;   if target != "kernel":
+;       for id, scope, method in syscalls.methods:
+;           if scope:
+;               name = f"{scope.name}_{method.name}"
+;           else:
+;               name = method.name
+;           cog.outl(f"define_syscall {name:20}, {id}")
+; ]]]
+; [[[end]]]