Date: Sat, 27 Oct 2001 01:19:47 -0700 From: Peter Wemm <peter@wemm.org> To: dfr@nlsystems.com Cc: ia64@freebsd.org Subject: ia64 crti.S and crtn.S Message-ID: <20011027081947.A3B56380A@overcee.netplex.com.au>
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I've discovered there are no crti/crtn implementations in the tree.. I've hacked together these ultra-trivial crti/crtn implementations: .file "crti.S" .section .init .global _init# .proc _init# _init: alloc loc1 = ar.pfs,0,2,0,0 mov loc0 = b0 /* Save return addr */ .endp _init# .section .fini .global _fini# .proc _fini# _fini: alloc loc1 = ar.pfs,0,2,0,0 mov loc0 = b0 /* Save return addr */ .endp _fini# And: .file "crtn.S" .section .init .regstk 0,2,0,0 mov b0 = loc0 /* Recover return addr */ mov ar.pfs = loc1 br.ret.sptk.many b0 .endp _init# .section .fini .regstk 0,2,0,0 mov b0 = loc0 /* Recover return addr */ mov ar.pfs = loc1 br.ret.sptk.many b0 .endp _fini# Would anybody care to comment on these? I'm in the process of putting together a build script to build the working parts of the userland, libraries and includes in one go, and these files came up. Second question.. Can I use a caller-saved register (eg: r4-r7) for this to avoid the pfs save/restore? Or would I have to use the register stack anyway in order to preserve our caller's r4-r7 first, thus defeating the purpose? (This is partly based on gcc output for clues). Cheers, -Peter -- Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au "All of this is for nothing if we don't go to the stars" - JMS/B5 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-ia64" in the body of the messagehelp
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