Implement crt1.o, crti.o, and crtn.o.

This helps running cross compiled programs as well as compiling programs
under Sortix with gcc. There is also support for global constructors.

Currently, cross-compiled executables uses these startup files. The current
build system continues to use start.o, which does not offer global
constructors and other useful features.

Note that these using the crtX.o files requires the crtbegin.o and crtend.o
files that ship with the cross compiler, but that should be no problem.

libmaxsi/Makefile

@@ -2,8 +2,6 @@ ifndef CPU
     CPU=x86
 endif
 
-BINS=libc.a libg.a libmaxsi.a libmaxsi-sortix.a
-
 ifeq ($(CPU),x86)
     CPUDEFINES=-DPLATFORM_X86
     CPUFLAGS=-m32
@@ -52,7 +50,6 @@ init.o \
 signal.o \
 $(CPU)/signal.o \
 $(CPU)/fork.o \
-start.o \
 time.o \
 random.o \
 abs.o \
@@ -165,6 +162,15 @@ putc.o \
 rewind.o \
 ungetc.o \
 
+CRTOBJ=\
+start.o \
+crt1.o \
+crti.o \
+crtn.o \
+
+MISCOBJ=\
+$(CRTOBJ) \
+
 UNPROCHEADERDIRS:=$(shell find include -type d)
 UNPROCHEADERS:=$(shell find include -type f)
 HEADERDIRS:=$(patsubst include%,preproc%,$(UNPROCHEADERDIRS))
@@ -182,6 +188,8 @@ crc32.o \
 SORTIXOBJS:=$(addprefix sortix/,$(SORTIXOBJS))
 SORTIXCPPFLAGS:=-DSORTIX_KERNEL
 
+BINS=libc.a libg.a libmaxsi.a libmaxsi-sortix.a $(CRTOBJ)
+
 all: $(BINS)
 
 libmaxsi.a: $(OBJS)
@@ -206,7 +214,16 @@ libg.so: libc.so
 	ln -sf $< $@
 
 start.o: $(CPU)/start.o
-	ln -sf $< $@
+	ln -f $< $@
+
+crt1.o: $(CPU)/crt1.o
+	ln -f $< $@
+
+crti.o: $(CPU)/crti.o
+	ln -f $< $@
+
+crtn.o: $(CPU)/crtn.o
+	ln -f $< $@
 
 # header preprocessing
 $(HEADERDIRS):
@@ -246,10 +263,8 @@ install:
 	for D in $(UNPROCHEADERDIRS); do mkdir -p $(SYSROOT)/usr/$$D || exit $?; done
 	for SRC in $(HEADERS); do DEST=`echo $$SRC | sed 's/preproc/include/'`; cp $$SRC $(SYSROOT)/usr/$$DEST || exit $?; done
 	mkdir -p $(SYSROOT)/usr/include
-	cp start.o $(SYSROOT)/usr/lib/crtbegin.o
 	touch deleteme.cpp
 	g++ $(CPUFLAGS) -c deleteme.cpp -o deleteme.o
-	for F in crt0.o crtn.o crt1.o crtend.o crtbeginT.o crti.o; do cp deleteme.o $(SYSROOT)/usr/lib/$$F; done
 	for F in libgcc.so libm.so libstdc++.so; do ld $(CPULDFLAGS) -shared deleteme.o -o $(SYSROOT)/usr/lib/$$F; done
 	rm -f deleteme.o deleteme.cpp
 

libmaxsi/x64/crt1.s

@@ -0,0 +1,54 @@
+/*******************************************************************************
+
+	Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
+
+	This file is part of LibMaxsi.
+
+	LibMaxsi is free software: you can redistribute it and/or modify it under
+	the terms of the GNU Lesser General Public License as published by the Free
+	Software Foundation, either version 3 of the License, or (at your option)
+	any later version.
+
+	LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
+	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+	FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
+	details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
+
+	crt1.s
+	Implement the _start symbol at which execution begins which performs the
+	task of initializing the standard library and executing the main function.
+
+*******************************************************************************/
+
+/* NOTE: This is almost identical to what is in start.s. crt1.s is used when
+         compiling with the real cross compiler, while start.s is used when
+         using the older hacky way of building Sortix. Please try to keep these
+         files alike by doing changes both places until we only build Sortix
+         with real cross compilers. */
+
+.section .text
+
+.global _start
+.type _start, @function
+_start:
+	movq %rcx, environ # envp
+
+	# Prepare signals, memory allocation, stdio and such.
+	pushq %rsi
+	pushq %rdi
+	call initialize_standard_library
+
+	# Run the global constructors.
+	call _init
+
+	# Run main
+	popq %rdi
+	popq %rsi
+	call main
+
+	# Terminate the process with main's exit code.
+	movl %eax, %edi
+	call exit

libmaxsi/x64/crti.s

@@ -0,0 +1,39 @@
+/*******************************************************************************
+
+	Copyright(C) Jonas 'Sortie' Termansen 2012.
+
+	This file is part of LibMaxsi.
+
+	LibMaxsi is free software: you can redistribute it and/or modify it under
+	the terms of the GNU Lesser General Public License as published by the Free
+	Software Foundation, either version 3 of the License, or (at your option)
+	any later version.
+
+	LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
+	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+	FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
+	details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
+
+	crti.s
+	Provides the header of the _init and _fini functions.
+
+*******************************************************************************/
+
+.section .init
+.global _init
+.type _init, @function
+_init:
+	push %rbp
+	movq %rsp, %rbp
+	/* gcc will nicely put the contents of crtbegin.o's .init section here. */
+
+.section .fini
+.global _fini
+.type _fini, @function
+_fini:
+	push %rbp
+	movq %rsp, %rbp
+	/* gcc will nicely put the contents of crtbegin.o's .fini section here. */

libmaxsi/x64/crtn.s

@@ -0,0 +1,33 @@
+/*******************************************************************************
+
+	Copyright(C) Jonas 'Sortie' Termansen 2012.
+
+	This file is part of LibMaxsi.
+
+	LibMaxsi is free software: you can redistribute it and/or modify it under
+	the terms of the GNU Lesser General Public License as published by the Free
+	Software Foundation, either version 3 of the License, or (at your option)
+	any later version.
+
+	LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
+	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+	FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
+	details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
+
+	crtn.s
+	Provides the tail of the _init and _fini functions.
+
+*******************************************************************************/
+
+.section .init
+	/* gcc will nicely put the contents of crtend.o's .init section here. */
+	popq %rbp
+	ret
+
+.section .fini
+	/* gcc will nicely put the contents of crtend.o's .fini section here. */
+	popq %rbp
+	ret

libmaxsi/x64/start.s

@@ -22,6 +22,12 @@
 
 ******************************************************************************/
 
+/* NOTE: This is almost identical to what is in crt1.s. crt1.s is used when
+         compiling with the real cross compiler, while start.s is used when
+         using the older hacky way of building Sortix. Please try to keep these
+         files alike by doing changes both places until we only build Sortix
+         with real cross compilers. */
+
 .globl _start
 
 .section .text

libmaxsi/x86/crt1.s

@@ -0,0 +1,54 @@
+/*******************************************************************************
+
+	Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
+
+	This file is part of LibMaxsi.
+
+	LibMaxsi is free software: you can redistribute it and/or modify it under
+	the terms of the GNU Lesser General Public License as published by the Free
+	Software Foundation, either version 3 of the License, or (at your option)
+	any later version.
+
+	LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
+	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+	FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
+	details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
+
+	crt1.s
+	Implement the _start symbol at which execution begins which performs the
+	task of initializing the standard library and executing the main function.
+
+*******************************************************************************/
+
+/* NOTE: This is almost identical to what is in start.s. crt1.s is used when
+         compiling with the real cross compiler, while start.s is used when
+         using the older hacky way of building Sortix. Please try to keep these
+         files alike by doing changes both places until we only build Sortix
+         with real cross compilers. */
+
+.section .text
+
+.global _start
+.type _start, @function
+_start:
+	movl %ecx, environ # envp
+
+	# Arguments for main
+	push %ebx # argv
+	push %eax # argc
+
+	# Prepare signals, memory allocation, stdio and such.
+	call initialize_standard_library
+
+	# Run the global constructors.
+	call _init
+
+	# Run main
+	call main
+
+	# Terminate the process with main's exit code.
+	push %eax
+	call exit

libmaxsi/x86/crti.s

@@ -0,0 +1,39 @@
+/*******************************************************************************
+
+	Copyright(C) Jonas 'Sortie' Termansen 2012.
+
+	This file is part of LibMaxsi.
+
+	LibMaxsi is free software: you can redistribute it and/or modify it under
+	the terms of the GNU Lesser General Public License as published by the Free
+	Software Foundation, either version 3 of the License, or (at your option)
+	any later version.
+
+	LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
+	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+	FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
+	details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
+
+	crti.s
+	Provides the header of the _init and _fini functions.
+
+*******************************************************************************/
+
+.section .init
+.global _init
+.type _init, @function
+_init:
+	push %ebp
+	movl %esp, %ebp
+	/* gcc will nicely put the contents of crtbegin.o's .init section here. */
+
+.section .fini
+.global _fini
+.type _fini, @function
+_fini:
+	push %ebp
+	movl %esp, %ebp
+	/* gcc will nicely put the contents of crtbegin.o's .fini section here. */

libmaxsi/x86/crtn.s

@@ -0,0 +1,33 @@
+/*******************************************************************************
+
+	Copyright(C) Jonas 'Sortie' Termansen 2012.
+
+	This file is part of LibMaxsi.
+
+	LibMaxsi is free software: you can redistribute it and/or modify it under
+	the terms of the GNU Lesser General Public License as published by the Free
+	Software Foundation, either version 3 of the License, or (at your option)
+	any later version.
+
+	LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
+	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+	FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
+	details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
+
+	crtn.s
+	Provides the tail of the _init and _fini functions.
+
+*******************************************************************************/
+
+.section .init
+	/* gcc will nicely put the contents of crtend.o's .init section here. */
+	popl %ebp
+	ret
+
+.section .fini
+	/* gcc will nicely put the contents of crtend.o's .fini section here. */
+	popl %ebp
+	ret

libmaxsi/x86/start.s

@@ -22,11 +22,16 @@
 
 ******************************************************************************/
 
+/* NOTE: This is almost identical to what is in crt1.s. crt1.s is used when
+         compiling with the real cross compiler, while start.s is used when
+         using the older hacky way of building Sortix. Please try to keep these
+         files alike by doing changes both places until we only build Sortix
+         with real cross compilers. */
+
 .globl _start
 
 .section .text
 
-.text  0x100000
 .type _start, @function
 _start: