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Diffstat (limited to 'libgloss/microblaze/linux-crt0.S')
| -rw-r--r-- | libgloss/microblaze/linux-crt0.S | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/libgloss/microblaze/linux-crt0.S b/libgloss/microblaze/linux-crt0.S new file mode 100644 index 000000000..8650bb5d2 --- /dev/null +++ b/libgloss/microblaze/linux-crt0.S @@ -0,0 +1,58 @@ +/* linux-crt0 -- Startup routines for the Linux BSP. + * + * Copyright (c) 2011 Edgar E. Iglesias + * + * The authors hereby grant permission to use, copy, modify, distribute, + * and license this software and its documentation for any purpose, provided + * that existing copyright notices are retained in all copies and that this + * notice is included verbatim in any distributions. No written agreement, + * license, or royalty fee is required for any of the authorized uses. + * Modifications to this software may be copyrighted by their authors + * and need not follow the licensing terms described here, provided that + * the new terms are clearly indicated on the first page of each file where + * they apply. + */ + + .section .text + .globl _start + .ent _start + .type _start, @function +_start: + la r13, r0, _SDA_BASE_ + la r2, r0, _SDA2_BASE_ + + brlid r15, __init + nop + + lwi r5, r1, 0 + addik r6, r1, 4 + + # Add argc * 4. + addk r7, r5, r5 + addk r7, r7, r7 + + brlid r15, main + # Now add 4 + r1 (i.e r6) in the delayslot. + addk r7, r7, r6 + + brlid r15, exit + addik r5, r3, 0 + .size _start, . - _start + .end _start + + /* Replacement for the GCC provided crti.S. This one avoids the + setup of stack protection regs (which result in privilieged + insn exceptions when running in user-space). */ + .section .init, "ax" + .global __init + .align 2 +__init: + addik r1, r1, -8 + sw r15, r0, r1 + + .section .fini, "ax" + .global __fini + .align 2 +__fini: + addik r1, r1, -8 + sw r15, r0, r1 |