From d89c9e8a63018810bb6a3e2ae55604996cc21e7b Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Sun, 20 Feb 2011 22:30:06 -0500 Subject: use an accessor function for __libc data pointer when compiled as PIC prior to this change, a large portion of libc was unusable prior to relocation by the dynamic linker, due to dependence on the global data in the __libc structure and the need to obtain its address through the GOT. with this patch, the accessor function __libc_loc is now able to obtain the address of __libc via PC-relative addressing without using the GOT. this means the majority of libc functionality is now accessible right away. naturally, the above statements all depend on having an architecture where PC-relative addressing and jumps/calls are feasible, and a compiler that generates the appropriate code. --- src/internal/libc.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'src/internal/libc.c') diff --git a/src/internal/libc.c b/src/internal/libc.c index 5e8e9d95..954efedf 100644 --- a/src/internal/libc.c +++ b/src/internal/libc.c @@ -1,3 +1,11 @@ #include "libc.h" -struct libc libc; +#ifdef __PIC__ +struct __libc *__libc_loc() +{ + static struct __libc __libc; + return &__libc; +} +#else +struct __libc __libc; +#endif -- cgit v1.2.1