sys: add ld runtime linker

sys/CMakeLists.txt

@@ -0,0 +1 @@
+add_subdirectory(ld)

sys/ld/CMakeLists.txt

@@ -0,0 +1,24 @@
+file(GLOB c_sources *.c *.h)
+file(GLOB arch_sources arch/${CMAKE_SYSTEM_PROCESSOR}/*.S)
+
+set_property(SOURCE ${arch_sources} PROPERTY LANGUAGE C)
+
+add_executable(ld ${c_sources} ${arch_sources})
+set_target_properties(ld PROPERTIES
+	POSITION_INDEPENDENT_CODE ON
+	OUTPUT_NAME "ld64"
+	SUFFIX ".so")
+
+target_link_libraries(ld ulibc libmango)
+
+target_compile_options(ld PRIVATE
+	-fPIC -fno-stack-protector -nostdlib -ffreestanding)
+target_link_options(ld PRIVATE
+	-fPIC -nostdlib -ffreestanding -Wl,-shared)
+
+sysroot_add_program(
+	NAME ld
+	BIN_DIR /lib)
+bsp_add_program(
+	NAME ld
+	BIN_DIR /lib)

sys/ld/arch/x86_64/layout.ld

@@ -0,0 +1,30 @@
+ENTRY(_start)
+
+SECTIONS {
+	.text ALIGN(4K) : {
+		*(.text)
+		*(.rodata)
+	}
+
+	.rodata ALIGN(4K) : {
+
+	}
+
+	.data ALIGN(4K) : {
+		*(.data)
+		*(.bss)
+		*(.dynamic)
+	}
+
+	.dynamic ALIGN(8) : {
+		*(.dynamic)
+	}
+
+	.got.plt ALIGN(4K) : {
+		*(.got.plt)
+	}
+
+	/DISCARD/ : {
+		*(.interp)
+	}
+}

sys/ld/arch/x86_64/start.S

@@ -0,0 +1,15 @@
+.code64
+
+.global _start
+.type _start, @function
+
+.extern main
+.type main, @function
+
+.extern exit
+.type exit, @function
+
+_start:
+	call main
+1:	pause
+	jmp 1b

sys/ld/main.c

@@ -0,0 +1,13 @@
+#include <mango/log.h>
+#include <mango/types.h>
+
+int main(
+	int argc,
+	const char **argv,
+	kern_handle_t task,
+	kern_handle_t address_space,
+	uintptr_t bsp_base)
+{
+	kern_log("ld!");
+	return 0;
+}