ADD: charge basics stuff.

7 files changed, 123 insertions, 0 deletions

@@ -0,0 +1,55 @@
+OUTPUT_FORMAT("elf64-x86-64")
+OUTPUT_ARCH("i386:x86-64")
+ENTRY(_start)
+
+SECTIONS
+{ 
+        . = 0x100000; /* start at 1mb. */
+
+        .text : ALIGN(4K)
+        {
+                *(.text.startup)
+                *(.text)
+                *(.text.*)
+        }
+
+        .rodata : ALIGN(4K)
+        {
+                *(.rodata)
+                *(.rodata.*)
+        }
+
+        .data : ALIGN(4K)
+        {
+                *(.data)
+                *(.data.*)
+        }
+
+        .bss : ALIGN(4K)
+        {
+                *(.bss)
+                *(.bss.*)
+                *(COMMON)
+        }
+
+        .note.netbsd.ident : ALIGN(4)
+        {
+                *(.note.netbsd.ident)
+        }
+
+        /DISCARD/ :
+        {
+                *(.comment)
+                *(.eh_frame)
+                *(.eh_frame_hdr)
+                *(.debug_*)
+                *(.stab)
+                *(.stabstr)
+                *(.shstrtab)
+                *(.strtab)
+                *(.symtab)
+        }
+}
+
+PROVIDE(__stack = 0x400000);
+PROVIDE(_end = .);
@@ -0,0 +1,23 @@
+src="src"
+out="out"
+
+bin="$out/bin"
+bin_ln="bin"
+
+note_src="$src/note.s"
+note_bin="$out/note.o"
+start_src="$src/start.s"
+start_bin="$out/start.o"
+main_src="$src/main.c"
+main_bin="$out/main.o"
+
+ln="ln"
+as="as"
+ld="ld"
+ld_cfg="cfg.ld"
+cc="gcc"
+
+lnflgs="-sf"
+asflgs=""
+ldflgs="-O0 -static -no-pie -T $ld_cfg"
+ccflgs="-nostdlib -ffreestanding -fno-pie -fno-builtin -std=c99 -O0 -g0"
@@ -0,0 +1,9 @@
+. ./mk.conf
+set -e
+
+mkdir $out
+$as $asflgs -o $note_bin $note_src
+$as $asflgs -o $start_bin $start_src
+$cc $ccflgs -o $main_bin -c $main_src
+$ld $ldflgs -o $bin $note_bin $start_bin $main_bin
+$ln $lnflgs $bin $bin_ln
@@ -0,0 +1,4 @@
+. ./mk.conf
+set -e
+
+rm -rf $out $bin_ln
@@ -0,0 +1,6 @@
+int main(int argc, char** argv);
+
+int main(int argc, char** argv)
+{
+        return 0;
+}
@@ -0,0 +1,9 @@
+.section .note.netbsd.ident, "a" # allocatable section.
+        .align 4
+        .int 7 # namesz = "NetBSD" = 7 bytes.
+        .int 4 # descsz = version = 4 bytes.
+        .int 1 # type = ELF_NOTE_TYPE_NETBSD_TAG.
+        .ascii "NetBSD" # name.
+        .byte 0 # null term for name.
+        .long 110000000 # desc = 11.0 (netbsd ver).
+        .align 4
@@ -0,0 +1,17 @@
+.section .text
+.globl _start
+.type _start, @function
+_start:
+        xorq %rbp, %rbp # frame ptr (%rbp) = null. marks stack bottom.
+
+        movl (%rsp), %edi # argc = first 4 bytes of stack.
+        leaq 8(%rsp), %rsi # argv = address of first arg ptr.
+
+        call main # see main.c.
+
+        movl %eax, %edi # status = ret val.
+        movl $1, %eax # SYS_exit = 1.
+        syscall
+
+        .size _start, .-_start
+        hlt # if syscall fails hang.