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refactor(asm): Put a high alignment on the uninitialized sections so the pointers have less entropy.

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This commit is contained in:
Veikko Sariola 2020-12-08 10:58:32 +02:00
parent 41fa46e954
commit a03d46284c
1 changed files with 5 additions and 5 deletions
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10
include/sointu/header.inc
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@ -44,11 +44,11 @@
; Windows has crinkler so one may put everything in custom sections to aid crinkler. ; Windows has crinkler so one may put everything in custom sections to aid crinkler.
; Maybe mac users need it too ; Maybe mac users need it too
%ifndef DISABLE_SECTIONS %ifndef DISABLE_SECTIONS
%define SECT_BSS(n) section . %+ n bss align=1 %define SECT_BSS(n) section . %+ n bss align=256 ; a high alignment on the uninitialized sections should compress better
%define SECT_DATA(n) section . %+ n data align=1 %define SECT_DATA(n) section . %+ n data align=1
%define SECT_TEXT(n) section . %+ n code align=1 %define SECT_TEXT(n) section . %+ n code align=1
%else %else
%define SECT_BSS(n) section .bss align=1 %define SECT_BSS(n) section .bss align=256
%define SECT_DATA(n) section .data align=1 %define SECT_DATA(n) section .data align=1
%define SECT_TEXT(n) section .code align=1 %define SECT_TEXT(n) section .code align=1
%endif %endif
@ -57,18 +57,18 @@
%define MANGLE_DATA(d) _ %+ d %define MANGLE_DATA(d) _ %+ d
; macho does not seem to support named sections, so DISABLE_SECTIONS ; macho does not seem to support named sections, so DISABLE_SECTIONS
; is "always on" / ignored ; is "always on" / ignored
%define SECT_BSS(n) section .bss align=1 %define SECT_BSS(n) section .bss align=256
%define SECT_DATA(n) section .data align=1 %define SECT_DATA(n) section .data align=1
%define SECT_TEXT(n) section .text align=1 %define SECT_TEXT(n) section .text align=1
%else ; Linux, or hopefully something similar %else ; Linux, or hopefully something similar
%define MANGLE_FUNC(f,n) f %define MANGLE_FUNC(f,n) f
%define MANGLE_DATA(d) d %define MANGLE_DATA(d) d
%ifndef DISABLE_SECTIONS %ifndef DISABLE_SECTIONS
%define SECT_BSS(n) section .bss. %+ n nobits alloc noexec write align=1 %define SECT_BSS(n) section .bss. %+ n nobits alloc noexec write align=256
%define SECT_DATA(n) section .data. %+ n progbits alloc noexec write align=1 %define SECT_DATA(n) section .data. %+ n progbits alloc noexec write align=1
%define SECT_TEXT(n) section .text. %+ n progbits alloc exec nowrite align=1 %define SECT_TEXT(n) section .text. %+ n progbits alloc exec nowrite align=1
%else %else
%define SECT_BSS(n) section .bss. nobits alloc noexec write align=1 %define SECT_BSS(n) section .bss. nobits alloc noexec write align=256
%define SECT_DATA(n) section .data. progbits alloc noexec write align=1 %define SECT_DATA(n) section .data. progbits alloc noexec write align=1
%define SECT_TEXT(n) section .text. progbits alloc exec nowrite align=1 %define SECT_TEXT(n) section .text. progbits alloc exec nowrite align=1
%endif %endif