kernelldr: skeleton build system in prep for dev

libraries/config/common.mk

@@ -49,13 +49,18 @@ endif
 
 ATMOSPHERE_DEFINES += -DATMOSPHERE_GIT_BRANCH=\"$(ATMOSPHERE_GIT_BRANCH)\" -DATMOSPHERE_GIT_REVISION=\"$(ATMOSPHERE_GIT_REVISION)\"
 
+#---------------------------------------------------------------------------------
+# Ensure top directory is set.
+#---------------------------------------------------------------------------------
+export TOPDIR ?= $(CURDIR)
+
 #---------------------------------------------------------------------------------
 # TARGET is the name of the output
 # SOURCES is a list of directories containing source code
 # DATA is a list of directories containing data files
 # INCLUDES is a list of directories containing header files
 #---------------------------------------------------------------------------------
-export TARGET       :=	$(notdir $(CURDIR))
+export TARGET       ?=	$(notdir $(CURDIR))
 export BUILD        :=  build
 export DATA         :=	data
 export INCLUDES     :=  include

libraries/config/templates/mesosphere.mk

@@ -0,0 +1,39 @@
+#---------------------------------------------------------------------------------
+# pull in common atmosphere configuration
+#---------------------------------------------------------------------------------
+include  $(dir $(abspath $(lastword $(MAKEFILE_LIST))))/../common.mk
+
+#---------------------------------------------------------------------------------
+# options for code generation
+#---------------------------------------------------------------------------------
+export DEFINES     := $(ATMOSPHERE_DEFINES) -DATMOSPHERE_IS_MESOSPHERE
+export SETTINGS    := $(ATMOSPHERE_SETTINGS) -O2 -mgeneral-regs-only -Werror
+export CFLAGS      := $(ATMOSPHERE_CFLAGS) $(SETTINGS) $(DEFINES) $(INCLUDE)
+export CXXFLAGS    := $(CFLAGS) $(ATMOSPHERE_CXXFLAGS)
+export ASFLAGS     := $(ATMOSPHERE_ASFLAGS) $(SETTINGS)
+
+export LDFLAGS	=	-specs=$(TOPDIR)/kernel_ldr.specs -nostdlib -nostartfiles -g $(SETTINGS) -Wl,-Map,$(notdir $*.map)
+
+export CXXWRAPS := -Wl,--wrap,__cxa_pure_virtual \
+			-Wl,--wrap,__cxa_throw \
+			-Wl,--wrap,__cxa_rethrow \
+			-Wl,--wrap,__cxa_allocate_exception \
+			-Wl,--wrap,__cxa_free_exception \
+			-Wl,--wrap,__cxa_begin_catch \
+			-Wl,--wrap,__cxa_end_catch \
+			-Wl,--wrap,__cxa_call_unexpected \
+			-Wl,--wrap,__cxa_call_terminate \
+			-Wl,--wrap,__gxx_personality_v0 \
+			-Wl,--wrap,_Unwind_Resume \
+			-Wl,--wrap,_Unwind_Resume \
+			-Wl,--wrap,_ZSt19__throw_logic_errorPKc \
+			-Wl,--wrap,_ZSt20__throw_length_errorPKc \
+			-Wl,--wrap,_ZNSt11logic_errorC2EPKc
+
+export LIBS := -lmesosphere
+
+#---------------------------------------------------------------------------------
+# list of directories containing libraries, this must be the top level containing
+# include and lib
+#---------------------------------------------------------------------------------
+LIBDIRS	:= $(ATMOSPHERE_LIBRARIES_DIR)/libvapours $(ATMOSPHERE_LIBRARIES_DIR)/libmesosphere

libraries/libmesosphere/source/libc/kern_libc.c

@@ -0,0 +1,422 @@
+/*
+ * Copyright (c) 2018-2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <string.h>
+#include <stddef.h>
+#include <limits.h>
+
+/* Note: copied from newlib */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+FUNCTION
+	<<memmove>>---move possibly overlapping memory
+INDEX
+	memmove
+SYNOPSIS
+	#include <string.h>
+	void *memmove(void *<[dst]>, const void *<[src]>, size_t <[length]>);
+DESCRIPTION
+	This function moves <[length]> characters from the block of
+	memory starting at <<*<[src]>>> to the memory starting at
+	<<*<[dst]>>>. <<memmove>> reproduces the characters correctly
+	at <<*<[dst]>>> even if the two areas overlap.
+RETURNS
+	The function returns <[dst]> as passed.
+PORTABILITY
+<<memmove>> is ANSI C.
+<<memmove>> requires no supporting OS subroutines.
+QUICKREF
+	memmove ansi pure
+*/
+
+/* Nonzero if either X or Y is not aligned on a "long" boundary.  */
+#define UNALIGNED(X, Y) \
+  (((long)X & (sizeof (long) - 1)) | ((long)Y & (sizeof (long) - 1)))
+
+/* How many bytes are copied each iteration of the 4X unrolled loop.  */
+#define BIGBLOCKSIZE    (sizeof (long) << 2)
+
+/* How many bytes are copied each iteration of the word copy loop.  */
+#define LITTLEBLOCKSIZE (sizeof (long))
+
+/* Threshhold for punting to the byte copier.  */
+#undef TOO_SMALL
+#define TOO_SMALL(LEN)  ((LEN) < BIGBLOCKSIZE)
+
+/*SUPPRESS 20*/
+void *
+//__inhibit_loop_to_libcall
+memmove (void *dst_void,
+	const void *src_void,
+	size_t length)
+{
+#if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__)
+  char *dst = dst_void;
+  const char *src = src_void;
+
+  if (src < dst && dst < src + length)
+    {
+      /* Have to copy backwards */
+      src += length;
+      dst += length;
+      while (length--)
+	{
+	  *--dst = *--src;
+	}
+    }
+  else
+    {
+      while (length--)
+	{
+	  *dst++ = *src++;
+	}
+    }
+
+  return dst_void;
+#else
+  char *dst = dst_void;
+  const char *src = src_void;
+  long *aligned_dst;
+  const long *aligned_src;
+
+  if (src < dst && dst < src + length)
+    {
+      /* Destructive overlap...have to copy backwards */
+      src += length;
+      dst += length;
+      while (length--)
+	{
+	  *--dst = *--src;
+	}
+    }
+  else
+    {
+      /* Use optimizing algorithm for a non-destructive copy to closely
+         match memcpy. If the size is small or either SRC or DST is unaligned,
+         then punt into the byte copy loop.  This should be rare.  */
+      if (!TOO_SMALL(length) && !UNALIGNED (src, dst))
+        {
+          aligned_dst = (long*)dst;
+          aligned_src = (long*)src;
+
+          /* Copy 4X long words at a time if possible.  */
+          while (length >= BIGBLOCKSIZE)
+            {
+              *aligned_dst++ = *aligned_src++;
+              *aligned_dst++ = *aligned_src++;
+              *aligned_dst++ = *aligned_src++;
+              *aligned_dst++ = *aligned_src++;
+              length -= BIGBLOCKSIZE;
+            }
+
+          /* Copy one long word at a time if possible.  */
+          while (length >= LITTLEBLOCKSIZE)
+            {
+              *aligned_dst++ = *aligned_src++;
+              length -= LITTLEBLOCKSIZE;
+            }
+
+          /* Pick up any residual with a byte copier.  */
+          dst = (char*)aligned_dst;
+          src = (char*)aligned_src;
+        }
+
+      while (length--)
+        {
+          *dst++ = *src++;
+        }
+    }
+
+  return dst_void;
+#endif /* not PREFER_SIZE_OVER_SPEED */
+}
+
+/*
+FUNCTION
+        <<memcpy>>---copy memory regions
+SYNOPSIS
+        #include <string.h>
+        void* memcpy(void *restrict <[out]>, const void *restrict <[in]>,
+                     size_t <[n]>);
+DESCRIPTION
+        This function copies <[n]> bytes from the memory region
+        pointed to by <[in]> to the memory region pointed to by
+        <[out]>.
+        If the regions overlap, the behavior is undefined.
+RETURNS
+        <<memcpy>> returns a pointer to the first byte of the <[out]>
+        region.
+PORTABILITY
+<<memcpy>> is ANSI C.
+<<memcpy>> requires no supporting OS subroutines.
+QUICKREF
+        memcpy ansi pure
+	*/
+
+void *
+memcpy (void * dst0,
+	const void * __restrict src0,
+	size_t len0)
+{
+#if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__)
+  char *dst = (char *) dst0;
+  char *src = (char *) src0;
+
+  void *save = dst0;
+
+  while (len0--)
+    {
+      *dst++ = *src++;
+    }
+
+  return save;
+#else
+  char *dst = dst0;
+  const char *src = src0;
+  long *aligned_dst;
+  const long *aligned_src;
+
+  /* If the size is small, or either SRC or DST is unaligned,
+     then punt into the byte copy loop.  This should be rare.  */
+  if (!TOO_SMALL(len0) && !UNALIGNED (src, dst))
+    {
+      aligned_dst = (long*)dst;
+      aligned_src = (long*)src;
+
+      /* Copy 4X long words at a time if possible.  */
+      while (len0 >= BIGBLOCKSIZE)
+        {
+          *aligned_dst++ = *aligned_src++;
+          *aligned_dst++ = *aligned_src++;
+          *aligned_dst++ = *aligned_src++;
+          *aligned_dst++ = *aligned_src++;
+          len0 -= BIGBLOCKSIZE;
+        }
+
+      /* Copy one long word at a time if possible.  */
+      while (len0 >= LITTLEBLOCKSIZE)
+        {
+          *aligned_dst++ = *aligned_src++;
+          len0 -= LITTLEBLOCKSIZE;
+        }
+
+       /* Pick up any residual with a byte copier.  */
+      dst = (char*)aligned_dst;
+      src = (char*)aligned_src;
+    }
+
+  while (len0--)
+    *dst++ = *src++;
+
+  return dst0;
+#endif /* not PREFER_SIZE_OVER_SPEED */
+}
+
+/*
+FUNCTION
+	<<memset>>---set an area of memory
+INDEX
+	memset
+SYNOPSIS
+	#include <string.h>
+	void *memset(void *<[dst]>, int <[c]>, size_t <[length]>);
+DESCRIPTION
+	This function converts the argument <[c]> into an unsigned
+	char and fills the first <[length]> characters of the array
+	pointed to by <[dst]> to the value.
+RETURNS
+	<<memset>> returns the value of <[dst]>.
+PORTABILITY
+<<memset>> is ANSI C.
+    <<memset>> requires no supporting OS subroutines.
+QUICKREF
+	memset ansi pure
+*/
+
+#include <string.h>
+
+#undef LBLOCKSIZE
+#undef UNALIGNED
+#undef TOO_SMALL
+
+#define LBLOCKSIZE (sizeof(long))
+#define UNALIGNED(X)   ((long)X & (LBLOCKSIZE - 1))
+#define TOO_SMALL(LEN) ((LEN) < LBLOCKSIZE)
+
+void *
+memset (void *m,
+	int c,
+	size_t n)
+{
+  char *s = (char *) m;
+
+#if !defined(PREFER_SIZE_OVER_SPEED) && !defined(__OPTIMIZE_SIZE__)
+  unsigned int i;
+  unsigned long buffer;
+  unsigned long *aligned_addr;
+  unsigned int d = c & 0xff;	/* To avoid sign extension, copy C to an
+				   unsigned variable.  */
+
+  while (UNALIGNED (s))
+    {
+      if (n--)
+        *s++ = (char) c;
+      else
+        return m;
+    }
+
+  if (!TOO_SMALL (n))
+    {
+      /* If we get this far, we know that n is large and s is word-aligned. */
+      aligned_addr = (unsigned long *) s;
+
+      /* Store D into each char sized location in BUFFER so that
+         we can set large blocks quickly.  */
+      buffer = (d << 8) | d;
+      buffer |= (buffer << 16);
+      for (i = 32; i < LBLOCKSIZE * 8; i <<= 1)
+        buffer = (buffer << i) | buffer;
+
+      /* Unroll the loop.  */
+      while (n >= LBLOCKSIZE*4)
+        {
+          *aligned_addr++ = buffer;
+          *aligned_addr++ = buffer;
+          *aligned_addr++ = buffer;
+          *aligned_addr++ = buffer;
+          n -= 4*LBLOCKSIZE;
+        }
+
+      while (n >= LBLOCKSIZE)
+        {
+          *aligned_addr++ = buffer;
+          n -= LBLOCKSIZE;
+        }
+      /* Pick up the remainder with a bytewise loop.  */
+      s = (char*)aligned_addr;
+    }
+
+#endif /* not PREFER_SIZE_OVER_SPEED */
+
+  while (n--)
+    *s++ = (char) c;
+
+  return m;
+}
+
+/*
+FUNCTION
+	<<memcmp>>---compare two memory areas
+INDEX
+	memcmp
+SYNOPSIS
+	#include <string.h>
+	int memcmp(const void *<[s1]>, const void *<[s2]>, size_t <[n]>);
+DESCRIPTION
+	This function compares not more than <[n]> characters of the
+	object pointed to by <[s1]> with the object pointed to by <[s2]>.
+RETURNS
+	The function returns an integer greater than, equal to or
+	less than zero 	according to whether the object pointed to by
+	<[s1]> is greater than, equal to or less than the object
+	pointed to by <[s2]>.
+PORTABILITY
+<<memcmp>> is ANSI C.
+<<memcmp>> requires no supporting OS subroutines.
+QUICKREF
+	memcmp ansi pure
+*/
+
+#undef LBLOCKSIZE
+#undef UNALIGNED
+#undef TOO_SMALL
+
+/* Nonzero if either X or Y is not aligned on a "long" boundary.  */
+#define UNALIGNED(X, Y) \
+  (((long)X & (sizeof (long) - 1)) | ((long)Y & (sizeof (long) - 1)))
+
+/* How many bytes are copied each iteration of the word copy loop.  */
+#define LBLOCKSIZE (sizeof (long))
+
+/* Threshhold for punting to the byte copier.  */
+#define TOO_SMALL(LEN)  ((LEN) < LBLOCKSIZE)
+
+int
+memcmp (const void *m1,
+	const void *m2,
+	size_t n)
+{
+#if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__)
+  unsigned char *s1 = (unsigned char *) m1;
+  unsigned char *s2 = (unsigned char *) m2;
+
+  while (n--)
+    {
+      if (*s1 != *s2)
+	{
+	  return *s1 - *s2;
+	}
+      s1++;
+      s2++;
+    }
+  return 0;
+#else
+  unsigned char *s1 = (unsigned char *) m1;
+  unsigned char *s2 = (unsigned char *) m2;
+  unsigned long *a1;
+  unsigned long *a2;
+
+  /* If the size is too small, or either pointer is unaligned,
+     then we punt to the byte compare loop.  Hopefully this will
+     not turn up in inner loops.  */
+  if (!TOO_SMALL(n) && !UNALIGNED(s1,s2))
+    {
+      /* Otherwise, load and compare the blocks of memory one
+         word at a time.  */
+      a1 = (unsigned long*) s1;
+      a2 = (unsigned long*) s2;
+      while (n >= LBLOCKSIZE)
+        {
+          if (*a1 != *a2)
+   	    break;
+          a1++;
+          a2++;
+          n -= LBLOCKSIZE;
+        }
+
+      /* check m mod LBLOCKSIZE remaining characters */
+
+      s1 = (unsigned char*)a1;
+      s2 = (unsigned char*)a2;
+    }
+
+  while (n--)
+    {
+      if (*s1 != *s2)
+	return *s1 - *s2;
+      s1++;
+      s2++;
+    }
+
+  return 0;
+#endif /* not PREFER_SIZE_OVER_SPEED */
+}
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif

mesosphere/kernel_ldr/Makefile

@@ -0,0 +1,113 @@
+#---------------------------------------------------------------------------------
+# pull in common atmosphere configuration
+#---------------------------------------------------------------------------------
+include  $(dir $(abspath $(lastword $(MAKEFILE_LIST))))/../../libraries/config/templates/mesosphere.mk
+
+#---------------------------------------------------------------------------------
+# no real need to edit anything past this point unless you need to add additional
+# rules for different file extensions
+#---------------------------------------------------------------------------------
+ifneq ($(BUILD),$(notdir $(CURDIR)))
+#---------------------------------------------------------------------------------
+
+export OUTPUT	:=	$(CURDIR)/$(TARGET)
+export DEPSDIR  :=  $(CURDIR)/$(BUILD)
+
+export VPATH	:=	$(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
+			$(foreach dir,$(DATA),$(CURDIR)/$(dir))
+
+CFILES      :=	$(foreach dir,$(SOURCES),$(filter-out $(notdir $(wildcard $(dir)/*.arch.*.c)) $(notdir $(wildcard $(dir)/*.board.*.c)) $(notdir $(wildcard $(dir)/*.os.*.c)), \
+                                                      $(notdir $(wildcard $(dir)/*.c))))
+CFILES      +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.arch.$(ATMOSPHERE_ARCH_NAME).c)))
+CFILES      +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.board.$(ATMOSPHERE_BOARD_NAME).c)))
+CFILES      +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.os.$(ATMOSPHERE_OS_NAME).c)))
+
+CPPFILES    :=	$(foreach dir,$(SOURCES),$(filter-out $(notdir $(wildcard $(dir)/*.arch.*.cpp)) $(notdir $(wildcard $(dir)/*.board.*.cpp)) $(notdir $(wildcard $(dir)/*.os.*.cpp)), \
+                                                      $(notdir $(wildcard $(dir)/*.cpp))))
+CPPFILES    +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.arch.$(ATMOSPHERE_ARCH_NAME).cpp)))
+CPPFILES    +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.board.$(ATMOSPHERE_BOARD_NAME).cpp)))
+CPPFILES    +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.os.$(ATMOSPHERE_OS_NAME).cpp)))
+
+SFILES      :=	$(foreach dir,$(SOURCES),$(filter-out $(notdir $(wildcard $(dir)/*.arch.*.s)) $(notdir $(wildcard $(dir)/*.board.*.s)) $(notdir $(wildcard $(dir)/*.os.*.s)), \
+                                                      $(notdir $(wildcard $(dir)/*.s))))
+SFILES      +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.arch.$(ATMOSPHERE_ARCH_NAME).s)))
+SFILES      +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.board.$(ATMOSPHERE_BOARD_NAME).s)))
+SFILES      +=  $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.os.$(ATMOSPHERE_OS_NAME).s)))
+
+#---------------------------------------------------------------------------------
+# use CXX for linking C++ projects, CC for standard C
+#---------------------------------------------------------------------------------
+ifeq ($(strip $(CPPFILES)),)
+#---------------------------------------------------------------------------------
+	export LD	:=	$(CC)
+#---------------------------------------------------------------------------------
+else
+#---------------------------------------------------------------------------------
+	export LD	:=	$(CXX)
+#---------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------
+
+export OFILES_BIN	:=	$(addsuffix .o,$(BINFILES))
+export OFILES_SRC	:=	$(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)
+export OFILES 	:=	$(OFILES_BIN) $(OFILES_SRC)
+export HFILES	:=	$(addsuffix .h,$(subst .,_,$(BINFILES)))
+
+export INCLUDE	:=	$(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
+			$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
+			-I.
+
+export LIBPATHS	:=	$(foreach dir,$(LIBDIRS),-L$(dir)/lib)
+
+.PHONY: clean all
+
+#---------------------------------------------------------------------------------
+all: $(BUILD)
+
+$(BUILD):
+	@[ -d $@ ] || mkdir -p $@
+	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile
+
+#---------------------------------------------------------------------------------
+clean:
+	@echo clean ...
+	@rm -fr $(BUILD) $(OUTPUT).bin $(OUTPUT).elf
+
+
+#---------------------------------------------------------------------------------
+else
+.PHONY:	all
+
+DEPENDS	:=	$(OFILES:.o=.d)
+
+#---------------------------------------------------------------------------------
+# main targets
+#---------------------------------------------------------------------------------
+all	:	$(OUTPUT).bin
+
+$(OUTPUT).bin	:	$(OUTPUT).elf
+	$(OBJCOPY) -S -O binary $< $@
+	@echo built ... $(notdir $@)
+
+$(OUTPUT).elf	:	$(OFILES)
+
+%.elf:
+	@echo linking $(notdir $@)
+	$(LD) $(LDFLAGS) $(OFILES) $(LIBPATHS) $(LIBS) -o $@
+	@$(NM) -CSn $@ > $(notdir $*.lst)
+
+$(OFILES_SRC)	: $(HFILES_BIN)
+
+#---------------------------------------------------------------------------------
+# you need a rule like this for each extension you use as binary data
+#---------------------------------------------------------------------------------
+%.bin.o	%_bin.h:	%.bin
+#---------------------------------------------------------------------------------
+	@echo $(notdir $<)
+	@$(bin2o)
+
+-include $(DEPENDS)
+
+#---------------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------------

mesosphere/kernel_ldr/kernel_ldr.ld

@@ -0,0 +1,195 @@
+OUTPUT_ARCH(aarch64)
+ENTRY(_start)
+
+PHDRS
+{
+	krnlldr PT_LOAD FLAGS(7) /* Read | Write | Execute */;
+	dyn     PT_DYNAMIC;
+}
+
+SECTIONS
+{
+	/* =========== CODE section =========== */
+	PROVIDE(__start__ = 0x0);
+	. = __start__;
+	__code_start = . ;
+
+	.crt0 :
+	{
+		KEEP (*(.crt0))
+		. = ALIGN(8);
+	} :krnlldr
+
+	.init :
+	{
+		KEEP( *(.init) )
+		. = ALIGN(8);
+	} :krnlldr
+
+	.plt :
+	{
+		*(.plt)
+		*(.iplt)
+		. = ALIGN(8);
+	} :krnlldr
+
+	.text :
+	{
+		*(.text.unlikely .text.*_unlikely .text.unlikely.*)
+		*(.text.exit .text.exit.*)
+		*(.text.startup .text.startup.*)
+		*(.text.hot .text.hot.*)
+		*(.text .stub .text.* .gnu.linkonce.t.*)
+		. = ALIGN(8);
+	} :krnlldr
+
+	.fini :
+	{
+		KEEP( *(.fini) )
+		. = ALIGN(8);
+	} :krnlldr
+
+	/* =========== RODATA section =========== */
+	. = ALIGN(8);
+	__rodata_start = . ;
+
+	.rodata :
+	{
+		*(.rodata .rodata.* .gnu.linkonce.r.*)
+		. = ALIGN(8);
+	} :krnlldr
+
+	.eh_frame_hdr     : { __eh_frame_hdr_start = .; *(.eh_frame_hdr) *(.eh_frame_entry .eh_frame_entry.*) __eh_frame_hdr_end = .; } :krnlldr
+	.eh_frame         : ONLY_IF_RO { KEEP (*(.eh_frame)) *(.eh_frame.*) } :krnlldr
+	.gcc_except_table : ONLY_IF_RO { *(.gcc_except_table .gcc_except_table.*) } :krnlldr
+	.gnu_extab        : ONLY_IF_RO { *(.gnu_extab*) } : rodata
+
+	.dynamic           : { *(.dynamic) } :krnlldr :dyn
+	.dynsym            : { *(.dynsym) } :krnlldr
+	.dynstr            : { *(.dynstr) } :krnlldr
+	.rela.dyn          : { *(.rela.*) } :krnlldr
+	.interp            : { *(.interp) } :krnlldr
+	.hash              : { *(.hash) } :krnlldr
+	.gnu.hash          : { *(.gnu.hash) } :krnlldr
+	.gnu.version       : { *(.gnu.version) } :krnlldr
+	.gnu.version_d     : { *(.gnu.version_d) } :krnlldr
+	.gnu.version_r     : { *(.gnu.version_r) } :krnlldr
+
+	/* =========== DATA section =========== */
+	. = ALIGN(8);
+	__data_start = . ;
+
+	.eh_frame : ONLY_IF_RW { KEEP (*(.eh_frame)) *(.eh_frame.*) } :krnlldr
+	.gcc_except_table : ONLY_IF_RW { *(.gcc_except_table .gcc_except_table.*) } :krnlldr
+	.gnu_extab : ONLY_IF_RW { *(.gnu_extab*) } : data
+	.exception_ranges : ONLY_IF_RW { *(.exception_ranges .exception_ranges*) } :krnlldr
+
+	.preinit_array ALIGN(8) :
+	{
+		PROVIDE (__preinit_array_start = .);
+		KEEP (*(.preinit_array))
+		PROVIDE (__preinit_array_end = .);
+	} :krnlldr
+
+	.init_array ALIGN(8) :
+	{
+		PROVIDE (__init_array_start = .);
+		KEEP (*(SORT(.init_array.*)))
+		KEEP (*(.init_array))
+		PROVIDE (__init_array_end = .);
+	} :krnlldr
+
+	.fini_array ALIGN(8) :
+	{
+		PROVIDE (__fini_array_start = .);
+		KEEP (*(.fini_array))
+		KEEP (*(SORT(.fini_array.*)))
+		PROVIDE (__fini_array_end = .);
+	} :krnlldr
+
+	.ctors ALIGN(8) :
+	{
+		KEEP (*crtbegin.o(.ctors)) /* MUST be first -- GCC requires it */
+		KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors))
+		KEEP (*(SORT(.ctors.*)))
+		KEEP (*(.ctors))
+	} :krnlldr
+
+	.dtors ALIGN(8) :
+	{
+		KEEP (*crtbegin.o(.dtors))
+		KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors))
+		KEEP (*(SORT(.dtors.*)))
+		KEEP (*(.dtors))
+	} :krnlldr
+
+	__got_start__ = .;
+
+	.got            : { *(.got) *(.igot) } :krnlldr
+	.got.plt        : { *(.got.plt)  *(.igot.plt) } :krnlldr
+
+	__got_end__ = .;
+
+	.data ALIGN(8) :
+	{
+		*(.data .data.* .gnu.linkonce.d.*)
+		SORT(CONSTRUCTORS)
+	} :krnlldr
+
+	__bss_start__ = .;
+	.bss ALIGN(8) :
+	{
+		*(.dynbss)
+		*(.bss .bss.* .gnu.linkonce.b.*)
+		*(COMMON)
+		. = ALIGN(8);
+
+		/* Reserve space for the stack */
+		__stack_start = .;
+		. += 0x1000;
+		__stack_end = .;
+	} :krnlldr
+	__bss_end__ = .;
+
+	__end__ = ABSOLUTE(.) ;
+
+	/* ==================
+	   ==== Metadata ====
+	   ================== */
+
+	/* Discard sections that difficult post-processing */
+	/DISCARD/ : { *(.group .comment .note) }
+
+	/* Stabs debugging sections. */
+	.stab          0 : { *(.stab) }
+	.stabstr       0 : { *(.stabstr) }
+	.stab.excl     0 : { *(.stab.excl) }
+	.stab.exclstr  0 : { *(.stab.exclstr) }
+	.stab.index    0 : { *(.stab.index) }
+	.stab.indexstr 0 : { *(.stab.indexstr) }
+
+	/* DWARF debug sections.
+	   Symbols in the DWARF debugging sections are relative to the beginning
+	   of the section so we begin them at 0. */
+
+	/* DWARF 1 */
+	.debug          0 : { *(.debug) }
+	.line           0 : { *(.line) }
+
+	/* GNU DWARF 1 extensions */
+	.debug_srcinfo  0 : { *(.debug_srcinfo) }
+	.debug_sfnames  0 : { *(.debug_sfnames) }
+
+	/* DWARF 1.1 and DWARF 2 */
+	.debug_aranges  0 : { *(.debug_aranges) }
+	.debug_pubnames 0 : { *(.debug_pubnames) }
+
+	/* DWARF 2 */
+	.debug_info     0 : { *(.debug_info) }
+	.debug_abbrev   0 : { *(.debug_abbrev) }
+	.debug_line     0 : { *(.debug_line) }
+	.debug_frame    0 : { *(.debug_frame) }
+	.debug_str      0 : { *(.debug_str) }
+	.debug_loc      0 : { *(.debug_loc) }
+	.debug_macinfo  0 : { *(.debug_macinfo) }
+}

mesosphere/kernel_ldr/kernel_ldr.specs

@@ -0,0 +1,7 @@
+%rename link old_link
+
+*link:
+%(old_link) -T %:getenv(TOPDIR /kernel_ldr.ld) -pie --gc-sections -z text -z nodynamic-undefined-weak -nostdlib -nostartfiles
+
+*startfile:
+crti%O%s crtbegin%O%s

mesosphere/kernel_ldr/source/start.s

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2018-2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* For some reason GAS doesn't know about it, even with .cpu cortex-a57 */
+#define cpuactlr_el1 s3_1_c15_c2_0
+#define cpuectlr_el1 s3_1_c15_c2_1
+
+.section    .crt0.text.start, "ax", %progbits
+.global     _start
+_start:
+    b _start