path: root/src/internal
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authorSzabolcs Nagy <>2013-09-15 02:00:32 +0000
committerSzabolcs Nagy <>2013-09-15 02:00:32 +0000
commitb20760c02318fa6da228587c401a8b2bb22a1aab (patch)
treea9bf139467269eb8a87fa2bb3423259eb59903e3 /src/internal
parent7a34dd3495d4bcd3dadc8b9fe2c89f819c15e7fd (diff)
support configurable page size on mips, powerpc and microblaze
PAGE_SIZE was hardcoded to 4096, which is historically what most systems use, but on several archs it is a kernel config parameter, user space can only know it at execution time from the aux vector. PAGE_SIZE and PAGESIZE are not defined on archs where page size is a runtime parameter, applications should use sysconf(_SC_PAGE_SIZE) to query it. Internally libc code defines PAGE_SIZE to libc.page_size, which is set to aux[AT_PAGESZ] in __init_libc and early in __dynlink as well. (Note that libc.page_size can be accessed without GOT, ie. before relocations are done) Some fpathconf settings are hardcoded to 4096, these should be actually queried from the filesystem using statfs.
Diffstat (limited to 'src/internal')
1 files changed, 6 insertions, 0 deletions
diff --git a/src/internal/libc.h b/src/internal/libc.h
index c8fbe3fd..3350b3d1 100644
--- a/src/internal/libc.h
+++ b/src/internal/libc.h
@@ -3,6 +3,7 @@
#include <stdlib.h>
#include <stdio.h>
+#include <limits.h>
struct __libc {
void *main_thread;
@@ -14,10 +15,15 @@ struct __libc {
FILE *ofl_head;
int ofl_lock[2];
size_t tls_size;
+ size_t page_size;
extern size_t __hwcap;
+#ifndef PAGE_SIZE
+#define PAGE_SIZE libc.page_size
#if !defined(__PIC__) || (100*__GNUC__+__GNUC_MINOR__ >= 303 && !defined(__PCC__))
#ifdef __PIC__