58 lines
1.3 KiB
ArmAsm
58 lines
1.3 KiB
ArmAsm
#
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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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.define .entry
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.entry:
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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 ptr to argv
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! sp ptr to env
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lw r4, 0(sp) ! r4 = argc
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addiu r5, sp, 4 ! r5 = argv
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sll r6, r4, 2 ! r6 = argc*4
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addu r6, r6, r5 ! r6 = null after last arg
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addiu r6, r6, 4 ! r6 = env
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addiu sp, sp, -3 * 4
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sw r4, 0(sp) ! argc
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sw r5, 4(sp) ! argv
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sw r6, 8(sp) ! envp
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j __m_a_i_n
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nop
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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 _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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