lib: c: implement runtime initialisation

lib/libc/CMakeLists.txt

@@ -26,7 +26,7 @@ bsp_add_library(
 	NAME libc
 	LIB_DIR /usr/lib)
 
-target_link_libraries(libc PRIVATE libmango libxpc-static interface::fs)
+target_link_libraries(libc PRIVATE libmango librosetta libxpc-static interface::fs)
 target_compile_definitions(libc PRIVATE ENABLE_GLOBAL_HEAP=1)
 
 add_subdirectory(pthread)

lib/libc/core/CMakeLists.txt

@@ -8,13 +8,17 @@ foreach (dir ${source_dirs})
 	set(headers ${headers} ${dir_headers})
 endforeach (dir)
 
-set(component_sources ${sources} PARENT_SCOPE)
+file(GLOB sys_sources
+	${CMAKE_CURRENT_SOURCE_DIR}/sys/${CMAKE_SYSTEM_PROCESSOR}/*.c
+	${CMAKE_CURRENT_SOURCE_DIR}/sys/${CMAKE_SYSTEM_PROCESSOR}/*.S)
+
+set(component_sources ${sources} ${sys_sources} PARENT_SCOPE)
 set(component_headers ${headers} PARENT_SCOPE)
 
 rosetta_add_library(STATIC
 	NAME libc-core
 	PUBLIC_INCLUDE_DIRS ${public_include_dirs}
-	SOURCES ${sources}
+	SOURCES ${sources} ${sys_sources}
 	HEADERS ${headers})
 
 sysroot_add_library(

lib/libc/core/sys/x86_64/init.c

@@ -0,0 +1,18 @@
+#include <mango/log.h>
+#include <rosetta/bootstrap.h>
+#include <stdio.h>
+
+extern int main(int, const char **, const char **);
+
+void *__attribute__((weak)) pthread_self(void)
+{
+	/* Nothing */
+	return NULL;
+}
+
+int __libc_init(const struct rosetta_bootstrap *bsinfo)
+{
+	(volatile void)pthread_self();
+	kern_logf("bsinfo = %p", bsinfo);
+	return 0;
+}

lib/libc/runtime/x86_64/crt0.s

@@ -3,18 +3,20 @@
 .global _start
 .type _start, @function
 
-.extern main
-.type main, @function
+.extern __libc_init
+.type __libc_init, @function
 
 .extern task_exit
 .type task_exit, @function
 
 _start:
-	# Args (as provided by the ABI)
-	# %rdi: int argc
-	# %rsi: const char **argv
-	# %rdx: kern_handle_t task
-	# %rcx: kern_handle_t address_space
+	# %rdi: (struct rosetta_bootstrap *)bs_info
+	mov %rdi, %rbx
+	call __libc_init
+
+	mov 0(%rbx), %rdi # argc
+	mov 8(%rbx), %rsi # argv
+	mov 24(%rbx), %rdx # envp
 	call main
 
 	mov %rax, %rdi