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* use hidden visibility for call from dlsym to internal __dlsymRich Felker2015-04-141-0/+1
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* dynamic linker bootstrap overhaulRich Felker2015-04-131-29/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | this overhaul further reduces the amount of arch-specific code needed by the dynamic linker and removes a number of assumptions, including: - that symbolic function references inside libc are bound at link time via the linker option -Bsymbolic-functions. - that libc functions used by the dynamic linker do not require access to data symbols. - that static/internal function calls and data accesses can be made without performing any relocations, or that arch-specific startup code handled any such relocations needed. removing these assumptions paves the way for allowing libc.so itself to be built with stack protector (among other things), and is achieved by a three-stage bootstrap process: 1. relative relocations are processed with a flat function. 2. symbolic relocations are processed with no external calls/data. 3. main program and dependency libs are processed with a fully-functional libc/ldso. reduction in arch-specific code is achived through the following: - crt_arch.h, used for generating crt1.o, now provides the entry point for the dynamic linker too. - asm is no longer responsible for skipping the beginning of argv[] when ldso is invoked as a command. - the functionality previously provided by __reloc_self for heavily GOT-dependent RISC archs is now the arch-agnostic stage-1. - arch-specific relocation type codes are mapped directly as macros rather than via an inline translation function/switch statement.
* rename dynamic linker entry point from _start to _dlstartRich Felker2014-06-201-3/+3
| | | | | | the main motivation for this change is to aid in debugging. since the main program's entry point is also named _start, it was difficult to set breakpoints or quickly identify which _start execution stopped in.
* arg-skipping code for powerpc dynamic linkerRich Felker2012-11-171-0/+8
| | | | this allows using the dynamic linker as a command to load programs.
* dynamic linking support for powerpcRich Felker2012-11-161-17/+16
| | | | | | | | incomplete but at least partly working. requires all files to be compiled in the new "secure" plt model, not the old one that put plt code in the data segment. TLS is untested but may work. invoking the dynamic linker explicitly to load a program does not yet handle argv correctly.
* fix indention with spaces in powerpc asmRich Felker2012-11-142-27/+26
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* PPC port cleaned up, static linking works well now.rofl0r2012-11-132-0/+31