summaryrefslogtreecommitdiff
path: root/libc/sysdeps/linux
diff options
context:
space:
mode:
Diffstat (limited to 'libc/sysdeps/linux')
-rw-r--r--libc/sysdeps/linux/arm/Makefile16
-rw-r--r--libc/sysdeps/linux/arm/crt1.S (renamed from libc/sysdeps/linux/arm/crt0.S)79
2 files changed, 57 insertions, 38 deletions
diff --git a/libc/sysdeps/linux/arm/Makefile b/libc/sysdeps/linux/arm/Makefile
index ca41ff6e7..f25d0b523 100644
--- a/libc/sysdeps/linux/arm/Makefile
+++ b/libc/sysdeps/linux/arm/Makefile
@@ -19,9 +19,9 @@
TOPDIR=../../../../
include $(TOPDIR)Rules.mak
-CRT0_SRC = crt0.S
-CRT0_OBJ = crt1.o
-SCRT0_OBJ = $(patsubst %,S%, $(CRT0_OBJ))
+CRT_SRC = crt1.S
+CRT_OBJ = crt1.o
+SCRT_OBJ = $(patsubst %,S%, $(CRT_OBJ))
CTOR_TARGETS=$(TOPDIR)lib/crti.o $(TOPDIR)lib/crtn.o
SSRC=__longjmp.S vfork.S clone.S setjmp.S bsd-setjmp.S \
@@ -31,22 +31,22 @@ SOBJS=$(patsubst %.S,%.o, $(SSRC))
CSRC=brk.c syscall.c ioperm.c sigaction.c
COBJS=$(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) $(SCRT0_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) $(SCRT0_OBJ) $(TOPDIR)lib/
+ 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 $*.o
-$(SCRT0_OBJ): $(CRT0_SRC)
+$(SCRT_OBJ): $(CRT_SRC)
$(CC) $(ASFLAGS) $(PIEFLAG) -DL_$* $< -c -o $*.o
$(STRIPTOOL) -x -R .note -R .comment $*.o
diff --git a/libc/sysdeps/linux/arm/crt0.S b/libc/sysdeps/linux/arm/crt1.S
index 4f4a8cefd..3bea01e73 100644
--- a/libc/sysdeps/linux/arm/crt0.S
+++ b/libc/sysdeps/linux/arm/crt1.S
@@ -49,15 +49,12 @@ ARM register quick reference:
#include <features.h>
.text
- .global _start
- .type _start,%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
+ .global _start
+ .type _start,%function
+ .type _init,%function
+ .type _fini,%function
+ .type main,%function
+ .type __uClibc_main,%function
.text
@@ -65,61 +62,83 @@ _start:
/* clear the frame pointer */
mov fp, #0
-#ifdef __ARCH_HAS_MMU__
- /* Load register r0 (argc) from the stack to its final resting place */
- ldr r0, [sp], #4
+#ifdef __PIC__
+ /* Store the address of main in r0 */
+ adr r5, .L_main
+ ldr r0, .L_main
+ add r0, r0, r5
+
+#else
+ /* Store the address of main in r0 */
+ ldr r0, =main
+#endif
- /* Copy argv pointer into r1 -- which its final resting place */
- mov r1, sp
+#ifdef __ARCH_HAS_MMU__
- /* Skip to the end of argv and put a pointer to whatever
- we find there (hopefully the environment) in r2 */
- add r2, r1, r0, lsl #2
- add r2, r2, #4
+ /* Load register r1 (argc) from the stack to its final resting place */
+ ldr r1, [sp], #4
+ /* Copy argv pointer into r2 -- which its final resting place */
+ mov r2, sp
#else
/*
* uClinux stacks look a little different from normal
* MMU-full Linux stacks (for no good reason)
*/
/* pull argc, argv and envp off the stack */
- ldr r0,[sp, #0]
- ldr r1,[sp, #4]
- ldr r2,[sp, #8]
+ ldr r1,[sp, #0]
+ ldr r2,[sp, #4]
#endif
#ifdef __PIC__
- /* Store the address of _init in r3 as an argument to main() */
+ /* Store the address of _init in r3 */
adr r5, .L_init
ldr r3, .L_init
add r3, r3, r5
- /* Push _fini onto the stack as the final argument to main() */
+ /* Push _fini onto the stack as an argument to main() */
ldr r4, .L_init + 4
add r4, r4, r5
+ stmfd sp!, {r4}
+
+ /* Push rtld_fini onto the stack as an argument to main() */
+ ldr r4, .L_init + 8
+ add r4, r4, r5
+ stmfd sp!, {r4}
#else
/* Store the address of _init in r3 as an argument to main() */
ldr r3, =_init
- /* Push _fini onto the stack as the final argument to main() */
+ /* Push _fini onto the stack as an argument to main() */
ldr r4, =_fini
-#endif
stmfd sp!, {r4}
- /* Ok, now run uClibc's main() -- shouldn't return */
- bl __uClibc_start_main
+ /* Push rtld_fini onto the stack as an argument to main() */
+ ldr r4, =rtld_fini
+ stmfd sp!, {r4}
+#endif
+
+ /* We need to call __uClibc_main which should not return.
+ __uClibc_main (int (*main) (int, char **, char **), int argc,
+ char **argv, void (*init) (void), void (*fini) (void),
+ void (*rtld_fini) (void), void *stack_end)
+ */
+ bl __uClibc_main
/* Crash if somehow `exit' returns anyways. */
bl abort
#ifdef __PIC__
.L_init:
- .word _init - .L_init
- .word _fini - .L_init
+ .word _init
+ .word _fini
+ .word rtld_fini
+.L_main:
+ .word main
#endif
/* We need this stuff to make gdb behave itself, otherwise
- gdb will chokes with SIGILL when trying to debug apps.
+ gdb will choke with SIGILL when trying to debug apps.
*/
.section ".note.ABI-tag", "a"
.align 4