path: root/crt
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authorRich Felker <>2013-07-26 01:49:14 -0400
committerRich Felker <>2013-07-26 01:49:14 -0400
commitc5e34dabbb47d8e97a4deccbb421e0cd93c0094b (patch)
tree4a5c7acc2af2d931ad9a9eeeede865e772344531 /crt
parentf9dd79c8d191a8a5356d146c7ccf956677fea4e9 (diff)
new mostly-C crt1 implementation
the only immediate effect of this commit is enabling PIE support on some archs that did not previously have any Scrt1.s, since the existing asm files for crt1 override this C code. so some of the crt_arch.h files committed are only there for the sake of documenting what their archs "would do" if they used the new C-based crt1. the expectation is that new archs should use this new system rather than using heavy asm for crt1. aside from being easier and less error-prone, it also ensures that PIE support is available immediately (since Scrt1.o is generated from the same C source, using -fPIC) rather than having to be added as an afterthought in the porting process.
Diffstat (limited to 'crt')
2 files changed, 17 insertions, 0 deletions
diff --git a/crt/Scrt1.c b/crt/Scrt1.c
index e69de29b..822f10bb 100644
--- a/crt/Scrt1.c
+++ b/crt/Scrt1.c
@@ -0,0 +1 @@
+#include "crt1.c"
diff --git a/crt/crt1.c b/crt/crt1.c
index e69de29b..14c4a52a 100644
--- a/crt/crt1.c
+++ b/crt/crt1.c
@@ -0,0 +1,16 @@
+#include <features.h>
+#include "crt_arch.h"
+int main();
+void _init() __attribute__((weak));
+void _fini() __attribute__((weak));
+_Noreturn int __libc_start_main(int (*)(), int, char **,
+ void (*)(), void(*)(), void(*)());
+void __cstart(long *p)
+ int argc = p[0];
+ char **argv = (void *)(p+1);
+ __libc_start_main(main, argc, argv, _init, _fini, 0);