[src/trunk]: src/sys/arch/amd64/stand/prekern Add three functions and start u...

[maxv <maxv%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/a78ee3909b41
branches:  trunk
changeset: 827464:a78ee3909b41
user:      maxv <maxv%NetBSD.org@localhost>
date:      Sun Oct 29 10:07:08 2017 +0000

description:
Add three functions and start using them; will be more useful soon.

diffstat:

 sys/arch/amd64/stand/prekern/elf.c |  61 +++++++++++++++++++++++++++----------
 1 files changed, 44 insertions(+), 17 deletions(-)

diffs (96 lines):

diff -r 18fedf13ab45 -r a78ee3909b41 sys/arch/amd64/stand/prekern/elf.c
--- a/sys/arch/amd64/stand/prekern/elf.c        Sun Oct 29 10:01:21 2017 +0000
+++ b/sys/arch/amd64/stand/prekern/elf.c        Sun Oct 29 10:07:08 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: elf.c,v 1.2 2017/10/11 16:21:06 maxv Exp $     */
+/*     $NetBSD: elf.c,v 1.3 2017/10/29 10:07:08 maxv Exp $     */
 
 /*
  * Copyright (c) 2017 The NetBSD Foundation, Inc. All rights reserved.
@@ -256,6 +256,46 @@
        }
 }
 
+static bool
+elf_section_is_text(Elf_Shdr *shdr)
+{
+       if (shdr->sh_type != SHT_NOBITS &&
+           shdr->sh_type != SHT_PROGBITS) {
+               return false;
+       }
+       if (!(shdr->sh_flags & SHF_EXECINSTR)) {
+               return false;
+       }
+       return true;
+}
+
+static bool
+elf_section_is_rodata(Elf_Shdr *shdr)
+{
+       if (shdr->sh_type != SHT_NOBITS &&
+           shdr->sh_type != SHT_PROGBITS) {
+               return false;
+       }
+       if (shdr->sh_flags & (SHF_EXECINSTR|SHF_WRITE)) {
+               return false;
+       }
+       return true;
+}
+
+static bool
+elf_section_is_data(Elf_Shdr *shdr)
+{
+       if (shdr->sh_type != SHT_NOBITS &&
+           shdr->sh_type != SHT_PROGBITS) {
+               return false;
+       }
+       if (!(shdr->sh_flags & SHF_WRITE) ||
+           (shdr->sh_flags & SHF_EXECINSTR)) {
+               return false;
+       }
+       return true;
+}
+
 static void
 elf_build_info(vaddr_t baseva)
 {
@@ -314,11 +354,7 @@
        /* text */
        minva = 0xFFFFFFFFFFFFFFFF, maxva = 0;
        for (i = 0; i < eif.ehdr->e_shnum; i++) {
-               if (eif.shdr[i].sh_type != SHT_NOBITS &&
-                   eif.shdr[i].sh_type != SHT_PROGBITS) {
-                       continue;
-               }
-               if (!(eif.shdr[i].sh_flags & SHF_EXECINSTR)) {
+               if (!elf_section_is_text(&eif.shdr[i])) {
                        continue;
                }
                secva = baseva + eif.shdr[i].sh_offset;
@@ -337,11 +373,7 @@
        /* rodata */
        minva = 0xFFFFFFFFFFFFFFFF, maxva = 0;
        for (i = 0; i < eif.ehdr->e_shnum; i++) {
-               if (eif.shdr[i].sh_type != SHT_NOBITS &&
-                   eif.shdr[i].sh_type != SHT_PROGBITS) {
-                       continue;
-               }
-               if ((eif.shdr[i].sh_flags & (SHF_EXECINSTR|SHF_WRITE))) {
+               if (!elf_section_is_rodata(&eif.shdr[i])) {
                        continue;
                }
                secva = baseva + eif.shdr[i].sh_offset;
@@ -360,12 +392,7 @@
        /* data */
        minva = 0xFFFFFFFFFFFFFFFF, maxva = 0;
        for (i = 0; i < eif.ehdr->e_shnum; i++) {
-               if (eif.shdr[i].sh_type != SHT_NOBITS &&
-                   eif.shdr[i].sh_type != SHT_PROGBITS) {
-                       continue;
-               }
-               if (!(eif.shdr[i].sh_flags & SHF_WRITE) ||
-                   (eif.shdr[i].sh_flags & SHF_EXECINSTR)) {
+               if (!elf_section_is_data(&eif.shdr[i])) {
                        continue;
                }
                secva = baseva + eif.shdr[i].sh_offset;