61 lines
1.2 KiB
ArmAsm
61 lines
1.2 KiB
ArmAsm
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! boot.s for osx386
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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 entry point of the Mach-o
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! executable and is the 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 ptr to argv
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! sp ptr to env
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lwz r3, 0(sp) ! r3 = argc
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addi r4, sp, 4 ! r4 = argv
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rlwinm r5, r3, 32-2, 2, 31 ! shift left 2 bits
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add r5, r5, r4
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addi r5, r5, 8 ! r5 = env
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stwu r5, -4(sp)
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stwu r4, -4(sp)
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stwu r3, -4(sp)
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b __m_a_i_n
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.sect rom
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begrom:
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.sect .data
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begdata:
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! Some magic data. All EM systems need these.
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.sect .bss
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begbss:
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.define hol0
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.comm hol0, 8 ! line number and filename (for debugging)
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.define _errno
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.comm _errno, 4 ! Posix errno storage
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.define .trppc, .ignmask
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.comm .trppc, 4 ! ptr to user trap handler
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.comm .ignmask, 4 ! user trap ignore mask
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