TOPDIR=../../../../
include $(TOPDIR)Rules.mak
-CRT0_SRC = crt0.S
-CRT0_OBJ = crt1.o
+CRT_SRC = crt1.S
+CRT_OBJ = crt1.o
+SCRT_OBJ = $(patsubst %,S%, $(CRT_OBJ))
CTOR_TARGETS=$(TOPDIR)lib/crti.o $(TOPDIR)lib/crtn.o
SSRC=bsd-_setjmp.S bsd-setjmp.S setjmp.S clone.S syscall.S pipe.S
cacheflush.c pread_write.c sysmips.c _test_and_set.c #sigaction.c
COBJS=$(patsubst %.c,%.o, $(CSRC))
-OBJS=$(SOBJS) $(MOBJ) $(COBJS)
+OBJS=$(SOBJS) $(COBJS)
OBJ_LIST=../../../obj.sysdeps.$(TARGET_ARCH)
all: $(OBJ_LIST)
-$(OBJ_LIST): $(OBJS) $(CRT0_OBJ) $(CTOR_TARGETS)
+$(OBJ_LIST): $(OBJS) $(CRT_OBJ) $(SCRT_OBJ) $(CTOR_TARGETS)
echo $(patsubst %, sysdeps/linux/$(TARGET_ARCH)/%, $(OBJS)) > $(OBJ_LIST)
$(INSTALL) -d $(TOPDIR)lib/
- cp $(CRT0_OBJ) $(TOPDIR)lib/
- $(LN) -fs $(CRT0_OBJ) $(TOPDIR)/lib/crt0.o
- $(LN) -fs $(CRT0_OBJ) $(TOPDIR)/lib/Scrt1.o
+ cp $(CRT_OBJ) $(SCRT_OBJ) $(TOPDIR)lib/
-$(CRT0_OBJ): $(CRT0_SRC)
+$(CRT_OBJ): $(CRT_SRC)
$(CC) $(ASFLAGS) -DL_$* $< -c -o $*.o
$(STRIPTOOL) -x -R .note -R .comment $*.o
+$(SCRT_OBJ): $(CRT_SRC)
+ $(CC) $(ASFLAGS) $(PIEFLAG) -DL_$* $< -c -o $*.o
+ $(STRIPTOOL) -x -R .note -R .comment $*.o
+
$(SOBJS): %.o : %.S
$(CC) $(ASFLAGS) -c $< -o $@
$(STRIPTOOL) -x -R .note -R .comment $*.o
$(CC) $(CFLAGS) -c $< -o $@
$(STRIPTOOL) -x -R .note -R .comment $*.o
-
ifeq ($(strip $(UCLIBC_CTOR_DTOR)),y)
crti.o: crti.S
$(CC) $(ASFLAGS) -c crti.S -o crti.o
+++ /dev/null
-/* When we enter this piece of code, the program stack looks like this:
- argc argument counter (integer)
- argv[0] program name (pointer)
- argv[1...N] program args (pointers)
- argv[argc-1] end of args (integer)
- NULL
- env[0...N] environment variables (pointers)
- NULL
-*/
-
-#include <features.h>
-#include <sys/regdef.h>
-
-.text
- .global __start
- .type __start,%function
- .type __uClibc_start_main,%function
- .weak _init
- .weak _fini
- .type __uClibc_start_main,%function
-/* Stick in a dummy reference to main(), so that if an application
- * is linking when the main() function is in a static library (.a)
- * we can be sure that main() actually gets linked in */
- .type main,%function
-
-__start:
-#ifdef __PIC__
- .set noreorder
- bltzal zero,0f
- nop
-0: .cpload $31
- .set reorder
-#endif
-
- move $31, zero /* no return, but since the jal kills $31, skip this */
- lw a0, 0($29) /* argc */
- addu a1, $29, 4 /* get to start of argv */
- addu a2, a0, 1 /* argv[0] program name (ordinal->cardinal) */
- sll a2, a2, 2 /* multiple by 4 */
- add a2, a2, a1 /* a2 now points to start of envp */
- la a3, _init /* a3 is address of _init */
- addiu sp, sp, -24 /* 16 + 4 rounded up to multiple of 8 */
- /* multiple of 8 for longlong/double support */
- la v0, _fini
- sw v0, 16(sp) /* stack has 5th argument, address of _fini */
-
- /* Ok, now run uClibc's main() -- shouldn't return */
- jal __uClibc_start_main
-
- addiu sp, sp, 24 /* undo stack argument */
-
- /* Crash if somehow `exit' returns anyways. */
-hlt:
- b hlt
-
-/* Define a symbol for the first piece of initialized data. */
- .data
- .globl __data_start
-__data_start:
- .long 0
- .weak data_start
- data_start = __data_start
-
--- /dev/null
+/* Startup code compliant to the ELF Mips ABI.
+ Copyright (C) 1995, 1997, 2000, 2001, 2002, 2003, 2004
+ Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library 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 2.1 of the License, or (at your option) any later version.
+
+ In addition to the permissions in the GNU Lesser General Public
+ License, the Free Software Foundation gives you unlimited
+ permission to link the compiled version of this file with other
+ programs, and to distribute those programs without any restriction
+ coming from the use of this file. (The GNU Lesser General Public
+ License restrictions do apply in other respects; for example, they
+ cover modification of the file, and distribution when not linked
+ into another program.)
+
+ Note that people who make modified versions of this file are not
+ obligated to grant this special exception for their modified
+ versions; it is their choice whether to do so. The GNU Lesser
+ General Public License gives permission to release a modified
+ version without this exception; this exception also makes it
+ possible to release a modified version which carries forward this
+ exception.
+
+ The GNU C Library 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 the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+
+#include <features.h>
+#include <sys/regdef.h>
+
+
+
+/* This is the canonical entry point, usually the first thing in the text
+ segment. The SVR4/Mips ABI (pages 3-31, 3-32) says that when the entry
+ point runs, most registers' values are unspecified, except for:
+
+ v0 ($2) Contains a function pointer to be registered with `atexit'.
+ This is how the dynamic linker arranges to have DT_FINI
+ functions called for shared libraries that have been loaded
+ before this code runs.
+
+ sp ($29) The stack contains the arguments and environment:
+ 0(%esp) argc
+ 4(%esp) argv[0]
+ ...
+ (4*argc)(%esp) NULL
+ (4*(argc+1))(%esp) envp[0]
+ ...
+ NULL
+ ra ($31) The return address register is set to zero so that programs
+ that search backword through stack frames recognize the last
+ stack frame.
+*/
+
+
+/* We need to call:
+ __uClibc_start_main (int (*main) (int, char **, char **), int argc,
+ char **argv, void (*init) (void), void (*fini) (void),
+ void (*rtld_fini) (void), void *stack_end)
+*/
+
+.text
+ .global _start
+ .type _start,%function
+ .type _init,%function
+ .type _fini,%function
+ .type main,%function
+ .type __uClibc_start_main,%function
+
+__start:
+#ifdef __PIC__
+ .set noreorder
+ move $0, $31 /* Save old ra. */
+ bal 10f /* Find addr of cpload. */
+ nop
+10:
+ .cpload $31;
+ move $31, $0;
+ .set reorder
+#else
+ la $28, _gp /* Setup GP correctly if we're non-PIC. */
+ move $31, $0
+#endif
+
+
+ la $4, main /* main */
+ lw $5, 0($29) /* argc */
+ addiu $6, $29, 4 /* argv */
+
+ /* Allocate space on the stack for seven arguments (o32 only)
+ and make sure the stack is aligned to double words (8 bytes)
+ on o32 and quad words (16 bytes) on n32 and n64. */
+ and $29, -2 * 4
+ subu $29, 32
+ la $7, _init /* init */
+ la $8, _fini
+ sw $8, 16($29) /* fini */
+ sw $2, 20($29) /* rtld_fini */
+ sw $29, 24($29) /* stack_end */
+ jal __uClibc_start_main
+hlt:
+ /* Crash if somehow `__uClibc_start_main' returns anyway. */
+ b hlt
+
+/* Define a symbol for the first piece of initialized data. */
+ .data
+ .globl __data_start
+__data_start:
+ .long 0
+ .weak data_start
+ data_start = __data_start
+
+
OSDN Git Service
