diff options
Diffstat (limited to 'libgloss/m68k/cf-crt0.S')
| -rw-r--r-- | libgloss/m68k/cf-crt0.S | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/libgloss/m68k/cf-crt0.S b/libgloss/m68k/cf-crt0.S new file mode 100644 index 000000000..9a73ce19c --- /dev/null +++ b/libgloss/m68k/cf-crt0.S @@ -0,0 +1,47 @@ +/* Initial boot + * + * Copyright (c) 2006 CodeSourcery Inc + * + * 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. + */ + + #include "asm.h" + .text + + .extern __stack + .extern __heap_end + .weak __heap_end + .extern __start1 + .globl __start +__start: + /* Initialize stack */ + move.l IMM(__stack), sp + move.l IMM(0), fp + move.l IMM(__heap_end), d1 +#if HOSTED + /* INIT_SIM syscall. Allows changing sp & d1. */ + move.l IMM(1),d0 + .align 4 + + /* The halt sequence must be 'nop; halt' and aligned to a 4 byte + boundary. */ + nop + halt + + /* This sentinel instruction value must be immediately after + the halt instruction. The debugger will adjust the pc, so + that it is never executed. This instruction is + 'movec %sp,0'. */ + .long 0x4e7bf000 +#endif + move.l d1,sp@- + move.l fp,sp@- /* Dummy return address */ + jmp __start1 |