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e9375a96b3
* m68k/Makefile.in (CF_CRT0): Rename to CF_CRT0S, separate hosted & unhosted versions. (CF_OBJS): Add cf-isv.o. (CF_SOURCES): Add cf-isv.S. (cf-hosted-crt0.o, cf-unhosted-crt0.o): New targets. * m68k/cf-isv.S: New, broken out of ... * m68k/cf-crt0.S: ... here. Add HOSTED & UNHOSTED differences. * m68k/cf-crt1.c (__start1): Add heap_limit argument. (__heap_limit): Define. * m68k/cf-sbrk.c (__heap_limit): Declare. (sbrk): Adjust for __heap_limit. * m68k/cf.sc: Use different crt0's for hosted & unhosted. Install a separate isv.o file. * m68k/io.h (HOSTED_PUTCHAR): Replace with ... (HOSTED_INIT_SIM): ... this.
48 lines
1.3 KiB
ArmAsm
48 lines
1.3 KiB
ArmAsm
/* Initial boot
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*
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* Copyright (c) 2006 CodeSourcery Inc
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#include "asm.h"
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.text
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.extern __stack
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.extern __heap_end
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.weak __heap_end
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.extern __start1
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.globl __start
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__start:
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/* Initialize stack */
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move.l IMM(__stack), sp
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move.l IMM(0), fp
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move.l IMM(__heap_end), d1
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#if HOSTED
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/* INIT_SIM syscall. Allows changing sp & d1. */
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move.l IMM(1),d0
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.align 4
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/* The halt sequence must be 'nop; halt' and aligned to a 4 byte
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boundary. */
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nop
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halt
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/* This sentinel instruction value must be immediately after
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the halt instruction. The debugger will adjust the pc, so
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that it is never executed. This instruction is
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'movec %sp,0'. */
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.long 0x4e7bf000
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#endif
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move.l d1,sp@-
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move.l fp,sp@- /* Dummy return address */
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jmp __start1
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