slight modifications

scripts/gensectioninfo.py

@@ -48,8 +48,8 @@ def main() -> int:
     section_ldsyms = Template(
 """
 /* --- SECTIONINFO START: ${section} --- */
-zerOS_${section}_start = ADDR(.${section});
-zerOS_${section}_end = ADDR(.${section}) + SIZEOF(.${section});
+zerOS_${section}_start = ABSOLUTE(ADDR(.${section}));
+zerOS_${section}_end = ABSOLUTE(ADDR(.${section})) + SIZEOF(.${section});
 zerOS_${section}_size = SIZEOF(.${section});
 /* --- SECTIONINFO END: ${section} --- */
 """

zerOS/linker-x86_64.ld.template

@@ -1,4 +1,4 @@
-/* TODO: Write a custom bootloader */
+/* TODO: Write a custom EFI-stub */
 
 /* Tell the linker that we want an x86_64 ELF64 output file */
 OUTPUT_FORMAT(elf64-x86-64)
@@ -17,7 +17,7 @@ PHDRS
     rodata  PT_LOAD;
     data    PT_LOAD;
     dynamic PT_DYNAMIC;
-    /* TODO: Add support for "TLS" or per-cpu variables / sections */
+    percpu  PT_LOAD;
 }
 
 SECTIONS
@@ -30,9 +30,7 @@ SECTIONS
     /* base load address. */
     . = 0xffffffff80000000 + SIZEOF_HEADERS;
 
-    .start_kern : {
-        zerOS_kernel_start = .;
-    } :rodata
+    zerOS_kernel_start = ABSOLUTE(.);
 
     /* Emit zerOS_<section_name>_start and zerOS_<section_name>_end symbols for each section. */
 
@@ -57,6 +55,12 @@ SECTIONS
         !!!__GENSECTION_FILL__!!!
     } :rodata
 
+    . = ALIGN(CONSTANT(MAXPAGESIZE));
+
+    .percpu : {
+        *(.percpu .percpu.*)
+    } :percpu
+
     /* Move to the next memory page for .data */
     . = ALIGN(CONSTANT(MAXPAGESIZE));
 
@@ -70,10 +74,7 @@ SECTIONS
         KEEP(*(.requests_end_marker))
     } :data
 
-    /* Dynamic section for relocations, both in its own PHDR and inside data PHDR. */
-    /*.dynamic : { */
-    /*    *(.dynamic) */
-    /*} :data :dynamic*/
+    . = ALIGN(CONSTANT(MAXPAGESIZE));
 
     /* NOTE: .bss needs to be the last thing mapped to :data, otherwise lots of */
     /* unnecessary zeros will be written to the binary. */
@@ -84,9 +85,8 @@ SECTIONS
         *(COMMON)
     } :data
 
-    .end_kern : {
-        zerOS_kernel_end = .;
-    } :rodata
+    zerOS_kernel_end = ABSOLUTE(.);
+
 
     /* Discard .note.* and .eh_frame* since they may cause issues on some hosts. */
     /* Also discard the program interpreter section since we do not need one. This is */
@@ -97,4 +97,9 @@ SECTIONS
         *(.note .note.*)
         *(.interp)
     }
-}
+}
+
+NOCROSSREFS_TO(.text, .bootcode)
+
+ASSERT(    ADDR(zerOS_kernel_start) == 0xffffffff80000000 + SIZEOF_HEADERS, "zerOS_kernel_start is not at the correct VMA")
+ASSERT(LOADADDR(zerOS_kernel_start) == 0xffffffff80000000 + SIZEOF_HEADERS, "zerOS_kernel_start is not at the correct LMA")