diff options
Diffstat (limited to 'libc/sysdeps/linux/arm')
| -rw-r--r-- | libc/sysdeps/linux/arm/Makefile | 16 | ||||
| -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 |