70 lines
1.3 KiB
ArmAsm
70 lines
1.3 KiB
ArmAsm
! plat/osx386/boot.s
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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 argv
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! sp env
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mov eax, (esp) ! eax = argc
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lea ebx, 4(esp) ! ebx = argv
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lea ecx, (esp)(eax*4)
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add ecx, 12 ! environ
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push ecx ! environ
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push ebx ! argc
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push eax ! argv
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push eax ! dummy, representing the return argument
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xor ebp, ebp
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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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push 1
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jmp __exit
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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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