[OSy] kalisto 0.8.8 vs -fno-optimize-sibling-calls

[jakub at jermar.eu]

Quoting Adam Hraska <smudloadam at gmail.com>:
> V skratke: volania C-ckovych fcii v head.S treba podla
> ABI obalit takto:
>
> addiu sp, -16
> jal wrapped_xyz
> nop
> addiu sp, +16

Akorat by se tech min 16 bytu melo naalokovat zaroven s vytvarenim celeho
stack framu [1] volajici funkce. Jinak by to mohlo poplest pripadny
stacktracovaci algoritmus [2].

Bohuzel samo GCC generuje kod, ktery porusuje zasady z [1] (napr. tu o jedinem
jr $ra v posdlednim delay slotu), takze clovek vlastne ani nevi jake  
ABI to GCC
pouziva.

[1] System V ABI, MIPS RISC Processor Supplement, 3rd Edition, mipsabi.pdf,
     str. 3-17,  2. bod

[2] System V ABI, MIPS RISC Processor Supplement, 3rd Edition, mipsabi.pdf,
     str. 3-27 a 3-28

JJ

----------------------------------------------------------------
This message was sent using IMP, the Internet Messaging Program.