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# $Id: README,v 1.2 2001-09-27 12:01:03 chris Exp $
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# $Id: README,v 1.2 2001-09-27 12:01:03 chris Exp $
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The location of the vectors file object is critical.
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The location of the vectors file object is critical.
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From the comments at the head of vectors.s:
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From the comments at the head of vectors.s:
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The issue with this file is getting it loaded at the right place.
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The issue with this file is getting it loaded at the right place.
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The first vector MUST be at address 0x????0100.
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The first vector MUST be at address 0x????0100.
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How this is achieved is dependant on the tool chain.
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How this is achieved is dependant on the tool chain.
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However the basic mechanism for ELF assemblers is to create a
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However the basic mechanism for ELF assemblers is to create a
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section called ".vectors", which will be loaded to an address
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section called ".vectors", which will be loaded to an address
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between 0x????0000 and 0x????0100 (inclusive) via a link script.
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between 0x????0000 and 0x????0100 (inclusive) via a link script.
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The basic mechanism for XCOFF assemblers is to place it in the
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The basic mechanism for XCOFF assemblers is to place it in the
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normal text section, and arrange for this file to be located
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normal text section, and arrange for this file to be located
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at an appropriate position on the linker command line.
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at an appropriate position on the linker command line.
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The variable 'PPC_VECTOR_FILE_BASE' must be defined to be the
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The variable 'PPC_VECTOR_FILE_BASE' must be defined to be the
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offset from 0x????0000 to the first location in the file. This
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offset from 0x????0000 to the first location in the file. This
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will usually be 0x0000 or 0x0100.
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will usually be 0x0000 or 0x0100.
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Andrew Bray 18/8/1995
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Andrew Bray 18/8/1995
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