75 lines
1.5 KiB
ArmAsm
75 lines
1.5 KiB
ArmAsm
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#
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! $Source: /cvsroot/tack/Ack/plat/linux386/boot.s,v $
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! $State: Exp $
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! $Revision: 1.3 $
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! Declare segments (the order is important).
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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.sect .text
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begtext:
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! This code is placed at the beginning of the ELF executable and is the
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! first thing that runs.
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!
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! On entry, the stack looks like this:
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!
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! sp+.. NULL
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! sp+8+(4*argc) env (X quads)
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! sp+4+(4*argc) NULL
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! sp+4 argv (argc quads)
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! sp argc
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!
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! The ACK actually expects:
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!
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! sp+8 argc
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! sp+4 argv
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! sp env
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move.l (0, sp), d0 ! d0 = argc
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move.l (4, sp), d1 ! d1 = argv
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move.l d0, d2
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asl.l #2, d2
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move.l (sp, d2), d2
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add.l #12, d2 ! d2 = environ
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move.l d2, -(sp) ! environ
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move.l d0, -(sp) ! argc
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move.l d1, -(sp) ! argv
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pea (0) ! dummy, representing the return address
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jmp (__m_a_i_n)
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! This provides an emergency exit routine used by EM.
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.define EXIT
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.extern EXIT
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EXIT:
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pea (1)
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jmp (__exit)
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! This is used by the trap routine for diagnostics.
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.define WRITE
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.extern WRITE
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WRITE:
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jmp (_write)
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! Define symbols at the beginning of our various segments, so that we can find
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! them. (Except .text, which has already been done.)
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.sect .data; begdata:
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.sect .rom; begrom:
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.sect .bss; begbss:
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! Some magic data. All EM systems need these.
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.define .trppc, .ignmask, _errno
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.comm .trppc, 4
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.comm .ignmask, 4
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.comm _errno, 4
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