74 lines
1.8 KiB
ArmAsm
74 lines
1.8 KiB
ArmAsm
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# uskel runtime and start; include this at the top.
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.section .init
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.global _start
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_start:
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jmp _uskel_start
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.include "include/macros.s"
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# this has globals
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.section .bss
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_unix_rsp:
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# back-up of program entry rsp (aka the actual stack given by the
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# actual OS; we might like to use it at some point, maybe)
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cell 0
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_write_region_start:
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# begin of the active memory area
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cell 0
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_write_region_end:
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# end of the active memory area (%rsp kinda starts here and goes down
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# towars the start)
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cell 0
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_gc_last_size:
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# how much data we evacuated last time
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cell 0
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_gc_min_alloc:
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# minimum possible allocation
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cell 0x100000 # tunable constant
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_gc_min_expect_ratio:
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# 256th's of the minimal amount of memory increment compared to the
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# last time. New minimal amount is compared as:
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# (ratio * last size) >> 8
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cell 0x200 # tunable constant
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_gc_region_start:
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# in GC, this region is being evacuated and will eventually disappear
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cell 0
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_gc_region_end:
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# end of the disappear region
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cell 0
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_gc_backup_thunk:
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# backup of %rsi so that we can use the register for other nonsense
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cell 0
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_gc_backup_cont:
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# backup of %rbp for same reason
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cell 0
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.section .text
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.include "include/gc.s"
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_uskel_start:
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# we use the stack pointer for easy writing to the heap;
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# back it up to memory state just if we ever needed it again.
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mov %rsp, _unix_rsp
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# allocate the initial chunk of memory
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mov $_uskel_start_main, %rsi
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jmp _uskel_alloc
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_uskel_start_main:
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# push a thunk for main
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pushq $0
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pushq $main
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mov $0, %rsi # set continuation to exit
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enter %rsp # run the program
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# Q: are there gonna be functions that have both the argument AND the cont?
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#
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# A: No, stuff is either entered as return-continuation (takes res,
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# cont has to be saved) or as forward call (takes cont)
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#
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# (A needs validation)
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