diff options
Diffstat (limited to 'libc/sysdeps')
| -rw-r--r-- | libc/sysdeps/linux/arm/crt1.S | 50 |
1 files changed, 23 insertions, 27 deletions
diff --git a/libc/sysdeps/linux/arm/crt1.S b/libc/sysdeps/linux/arm/crt1.S index 3bea01e73..69357a913 100644 --- a/libc/sysdeps/linux/arm/crt1.S +++ b/libc/sysdeps/linux/arm/crt1.S @@ -59,23 +59,29 @@ ARM register quick reference: .text _start: + /* Save a copy of rtld_fini before r0 gets nuked */ + mov r5, r0 + /* clear the frame pointer */ mov fp, #0 + + /* Load register r0 with main */ #ifdef __PIC__ - /* Store the address of main in r0 */ - adr r5, .L_main + adr r8, .L_main ldr r0, .L_main - add r0, r0, r5 + add r0, r0, r8 + ldr r4, .L_init + 4 + add r4, r4, r8 #else - /* Store the address of main in r0 */ ldr r0, =main #endif + #ifdef __ARCH_HAS_MMU__ - /* Load register r1 (argc) from the stack to its final resting place */ + /* Load register r1 from the stack to its final resting place */ ldr r1, [sp], #4 /* Copy argv pointer into r2 -- which its final resting place */ @@ -85,45 +91,36 @@ _start: * uClinux stacks look a little different from normal * MMU-full Linux stacks (for no good reason) */ - /* pull argc, argv and envp off the stack */ + /* pull argc and argv off the stack */ ldr r1,[sp, #0] ldr r2,[sp, #4] #endif + /* Store _init and _fini to r3 and r4 */ #ifdef __PIC__ - /* Store the address of _init in r3 */ - adr r5, .L_init + adr r8, .L_init ldr r3, .L_init - add r3, r3, r5 + add r3, r3, r8 - /* 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} + add r4, r4, r8 #else - /* Store the address of _init in r3 as an argument to main() */ ldr r3, =_init - - /* Push _fini onto the stack as an argument to main() */ ldr r4, =_fini - stmfd sp!, {r4} - - /* Push rtld_fini onto the stack as an argument to main() */ - ldr r4, =rtld_fini - stmfd sp!, {r4} #endif + /* Store _fini(r4), rtld_fini(r5), and stack_end(r2) on the stack */ + str r2, [sp, #-4]! + str r5, [sp, #-4]! + str r4, [sp, #-4]! + + /* 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 + bl __uClibc_main /* Crash if somehow `exit' returns anyways. */ bl abort @@ -132,7 +129,6 @@ _start: .L_init: .word _init .word _fini - .word rtld_fini .L_main: .word main #endif |