diff options
Diffstat (limited to 'libc/sysdeps/linux/arm/crt1.S')
| -rw-r--r-- | libc/sysdeps/linux/arm/crt1.S | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/arm/crt1.S b/libc/sysdeps/linux/arm/crt1.S index 8d4d230a7..082348e39 100644 --- a/libc/sysdeps/linux/arm/crt1.S +++ b/libc/sysdeps/linux/arm/crt1.S @@ -94,6 +94,7 @@ ARM register quick reference: */ #include <features.h> +#include <bits/arm_asm.h> .text .globl _start @@ -105,6 +106,73 @@ ARM register quick reference: .weak _fini #endif +#if defined(THUMB1_ONLY) +.thumb_func +_start: + /* Clear the frame pointer since this is the outermost frame. */ + mov r3, #0 + mov fp, r3 + +#ifdef __ARCH_USE_MMU__ + /* Pop argc off the stack and save a pointer to argv */ + pop {a2} + mov a3, sp +#else + /* + * uClinux/arm stacks look a little different from normal + * MMU-full Linux/arm stacks (for no good reason) + */ + /* pull argc and argv off the stack. We are going to push 3 + * arguments, so pop one here to maintain doubleword alignment. */ + pop {a2} + ldr a3, [sp] +#endif + + /* Push stack limit and rtld_fini */ + push {a1, a3} + +#ifdef __PIC__ + ldr r4, .L_GOT +.L_GOT_OFF: + adr r5, .L_GOT + add r4, r5, r4 + + ldr r5, .L_GOT+4 /* _fini */ + ldr a1, [r4, r5] + push {a1} /* Push _fini */ + + ldr r5, .L_GOT+8 /* _init */ + ldr a4, [r4, r5] + + ldr r5, .L_GOT+12 /* main */ + ldr a1, [r4, r5] + +#else + /* Fetch address of fini */ + ldr r4, =_fini + /* Push fini */ + push {r4} + + /* Set up the other arguments in registers */ + ldr a1, =main + ldr a4, =_init +#endif + /* __uClibc_main (main, argc, argv, init, fini, rtld_fini, stack_end) */ + /* Let the libc call main and exit with its return code. */ + bl __uClibc_main + + /* should never get here....*/ + bl abort +.pool + +#ifdef __PIC__ +.L_GOT: + .word _GLOBAL_OFFSET_TABLE_-.L_GOT + .word _fini(GOT) + .word _init(GOT) + .word main(GOT) +#endif +#else /* !THUMB1_ONLY */ _start: /* Clear the frame pointer and link register since this is the outermost frame. */ mov fp, #0 @@ -175,6 +243,7 @@ _start: .word _init(GOT) .word main(GOT) #endif +#endif /* Define a symbol for the first piece of initialized data. */ .data |