43 lines
955 B
NASM
43 lines
955 B
NASM
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# Allocate stack for NT, inserting stack probes every 4k pages
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.file "ntstack.asm"
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# Setup MS Structured-Exception-Handling
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.pdata
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.align 2
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.ualong ..__allocate_stack,__allocate_stack.e,0,0,__allocate_stack.b
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# Switch to the relocation section
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.reldata
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.globl __allocate_stack
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.globl ..__allocate_stack
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__allocate_stack:
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.ualong ..__allocate_stack,.toc
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.text
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.align 2
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..__allocate_stack:
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.function ..__allocate_stack
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__allocate_stack.b:
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addi 3,3,15 # round up to 16 byte alignment
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lwz 0,0(1) # old stack link
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rlwinm 3,3,0,0,28
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srawi. 4,3,12 # get # of pages to check
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neg 3,3 # negate so we can use stwux
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bgt- 0,.Lcheck
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stwux 0,1,3 # small request, just decrement and return
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blr
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.Lcheck:
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mtctr 4 # number of pages to check
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mr 5,1 # tmp pointer
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.Lloop:
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lwzu 6,-4096(5) # touch the page
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bdnz+ .Lloop # and loop back
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stwux 0,1,3 # update stack pointer
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blr
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__allocate_stack.e:
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FE_MOT_RESVD..__allocate_stack:
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