55 lines
896 B
ArmAsm
55 lines
896 B
ArmAsm
.text
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.global __clone
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.hidden __clone
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.type __clone, @function
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__clone:
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! incoming: fn stack flags arg ptid tls ctid
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! r4 r5 r6 r7 @r15 @(4,r15) @(8,r15)
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mov #-16, r0
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and r0, r5
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mov r4, r1 ! r1 = fn
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mov r7, r2 ! r2 = arg
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mov #120, r3 ! r3 = __NR_clone
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mov r6, r4 ! r4 = flags
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!mov r5, r5 ! r5 = stack
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mov.l @r15, r6 ! r6 = ptid
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mov.l @(8,r15), r7 ! r7 = ctid
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mov.l @(4,r15), r0 ! r0 = tls
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trapa #31
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or r0, r0
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or r0, r0
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or r0, r0
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or r0, r0
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or r0, r0
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cmp/eq #0, r0
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bt 1f
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! we are the parent, return
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rts
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nop
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1: ! we are the child, call fn(arg)
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mov.l 1f, r0
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mov r1, r5
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bsrf r0
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mov r2, r4
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2: mov #1, r3 ! __NR_exit
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mov r0, r4
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trapa #31
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or r0, r0
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or r0, r0
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or r0, r0
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or r0, r0
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or r0, r0
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.align 2
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.hidden __shcall
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1: .long __shcall@PCREL+(.-2b)
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