diff options
Diffstat (limited to '069allocate.subx')
| -rw-r--r-- | 069allocate.subx | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/069allocate.subx b/069allocate.subx index 48ba9413..503d151f 100644 --- a/069allocate.subx +++ b/069allocate.subx @@ -234,4 +234,36 @@ $allocate-region:abort: cd/syscall 0x80/imm8 # never gets here +# Claim the next 'n+4' bytes of memory and initialize the first 4 to n. +# Abort if there isn't enough memory in 'ad'. +allocate-array: # ad: (addr allocation-descriptor), n: int -> result/eax: (addr _) + # . prologue + 55/push-ebp + 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp + # . save registers + 51/push-ecx + 52/push-edx + # ecx = n + 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 1/r32/ecx 0xc/disp8 . # copy *(ebp+0xc) to ecx + # var size/edx: int = n+4 + 8d/copy-address 1/mod/*+disp8 1/rm32/ecx . . . 2/r32/edx 4/disp8 . # copy ecx+4 to edx + # result = allocate(ad, size) + # . . push args + 52/push-edx + ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8) + # . . call + e8/call allocate/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp + # *result = n + 89/copy 0/mod/indirect 0/rm32/eax . . . 1/r32/ecx . . # copy ecx to *eax +$allocate-array:end: + # . restore registers + 5a/pop-to-edx + 59/pop-to-ecx + # . epilogue + 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp + 5d/pop-to-ebp + c3/return + # . . vim:nowrap:textwidth=0 |