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Diffstat (limited to 'libgloss/m68k/cf-hosted.S')
| -rw-r--r-- | libgloss/m68k/cf-hosted.S | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/libgloss/m68k/cf-hosted.S b/libgloss/m68k/cf-hosted.S new file mode 100644 index 000000000..9cf88209c --- /dev/null +++ b/libgloss/m68k/cf-hosted.S @@ -0,0 +1,38 @@ +/* + * cf-hosted.S -- + * + * 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. + */ + +/* Semihosting function. The debugger intercepts the halt, and + determines that it is followed by the sentinel pattern. */ + + .globl __hosted +__hosted: + linkw %fp,#0 + movel %fp@(8),%d0 + movel %fp@(12),%d1 + .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 + unlk %fp + rts |